/*
 * Copyright © 2006-2007 Intel Corporation
 *
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated documentation files (the "Software"),
 * to deal in the Software without restriction, including without limitation
 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
 * and/or sell copies of the Software, and to permit persons to whom the
 * Software is furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice (including the next
 * paragraph) shall be included in all copies or substantial portions of the
 * Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
 * DEALINGS IN THE SOFTWARE.
 *
 * Authors:
 *      Eric Anholt <eric@anholt.net>
 */

#include <linux/dmi.h>
#include <linux/module.h>
#include <linux/input.h>
#include <linux/i2c.h>
#include <linux/kernel.h>
#include <linux/slab.h>
#include <linux/vgaarb.h>
#include <drm/drm_edid.h>
#include <drm/drmP.h>
#include "intel_drv.h"
#include "intel_frontbuffer.h"
#include <drm/i915_drm.h>
#include "i915_drv.h"
#include "i915_gem_clflush.h"
#include "intel_dsi.h"
#include "i915_trace.h"
#include <drm/drm_atomic.h>
#include <drm/drm_atomic_helper.h>
#include <drm/drm_dp_helper.h>
#include <drm/drm_crtc_helper.h>
#include <drm/drm_plane_helper.h>
#include <drm/drm_rect.h>
#include <drm/drm_atomic_uapi.h>
#include <linux/dma_remapping.h>
#include <linux/reservation.h>

/* Primary plane formats for gen <= 3 */
static const uint32_t i8xx_primary_formats[] = {
        DRM_FORMAT_C8,
        DRM_FORMAT_RGB565,
        DRM_FORMAT_XRGB1555,
        DRM_FORMAT_XRGB8888,
};

/* Primary plane formats for gen >= 4 */
static const uint32_t i965_primary_formats[] = {
        DRM_FORMAT_C8,
        DRM_FORMAT_RGB565,
        DRM_FORMAT_XRGB8888,
        DRM_FORMAT_XBGR8888,
        DRM_FORMAT_XRGB2101010,
        DRM_FORMAT_XBGR2101010,
};

static const uint64_t i9xx_format_modifiers[] = {
        I915_FORMAT_MOD_X_TILED,
        DRM_FORMAT_MOD_LINEAR,
        DRM_FORMAT_MOD_INVALID
};

static const uint32_t skl_primary_formats[] = {
        DRM_FORMAT_C8,
        DRM_FORMAT_RGB565,
        DRM_FORMAT_XRGB8888,
        DRM_FORMAT_XBGR8888,
        DRM_FORMAT_ARGB8888,
        DRM_FORMAT_ABGR8888,
        DRM_FORMAT_XRGB2101010,
        DRM_FORMAT_XBGR2101010,
        DRM_FORMAT_YUYV,
        DRM_FORMAT_YVYU,
        DRM_FORMAT_UYVY,
        DRM_FORMAT_VYUY,
};

static const uint32_t skl_pri_planar_formats[] = {
        DRM_FORMAT_C8,
        DRM_FORMAT_RGB565,
        DRM_FORMAT_XRGB8888,
        DRM_FORMAT_XBGR8888,
        DRM_FORMAT_ARGB8888,
        DRM_FORMAT_ABGR8888,
        DRM_FORMAT_XRGB2101010,
        DRM_FORMAT_XBGR2101010,
        DRM_FORMAT_YUYV,
        DRM_FORMAT_YVYU,
        DRM_FORMAT_UYVY,
        DRM_FORMAT_VYUY,
        DRM_FORMAT_NV12,
};

static const uint64_t skl_format_modifiers_noccs[] = {
        I915_FORMAT_MOD_Yf_TILED,
        I915_FORMAT_MOD_Y_TILED,
        I915_FORMAT_MOD_X_TILED,
        DRM_FORMAT_MOD_LINEAR,
        DRM_FORMAT_MOD_INVALID
};

static const uint64_t skl_format_modifiers_ccs[] = {
        I915_FORMAT_MOD_Yf_TILED_CCS,
        I915_FORMAT_MOD_Y_TILED_CCS,
        I915_FORMAT_MOD_Yf_TILED,
        I915_FORMAT_MOD_Y_TILED,
        I915_FORMAT_MOD_X_TILED,
        DRM_FORMAT_MOD_LINEAR,
        DRM_FORMAT_MOD_INVALID
};

/* Cursor formats */
static const uint32_t intel_cursor_formats[] = {
        DRM_FORMAT_ARGB8888,
};

static const uint64_t cursor_format_modifiers[] = {
        DRM_FORMAT_MOD_LINEAR,
        DRM_FORMAT_MOD_INVALID
};

static void i9xx_crtc_clock_get(struct intel_crtc *crtc,
                                struct intel_crtc_state *pipe_config);
static void ironlake_pch_clock_get(struct intel_crtc *crtc,
                                   struct intel_crtc_state *pipe_config);

static int intel_framebuffer_init(struct intel_framebuffer *ifb,
                                  struct drm_i915_gem_object *obj,
                                  struct drm_mode_fb_cmd2 *mode_cmd);
static void i9xx_set_pipeconf(struct intel_crtc *intel_crtc);
static void intel_set_pipe_timings(struct intel_crtc *intel_crtc);
static void intel_set_pipe_src_size(struct intel_crtc *intel_crtc);
static void intel_cpu_transcoder_set_m_n(struct intel_crtc *crtc,
                                         struct intel_link_m_n *m_n,
                                         struct intel_link_m_n *m2_n2);
static void ironlake_set_pipeconf(struct drm_crtc *crtc);
static void haswell_set_pipeconf(struct drm_crtc *crtc);
static void haswell_set_pipemisc(struct drm_crtc *crtc);
static void vlv_prepare_pll(struct intel_crtc *crtc,
                            const struct intel_crtc_state *pipe_config);
static void chv_prepare_pll(struct intel_crtc *crtc,
                            const struct intel_crtc_state *pipe_config);
static void intel_begin_crtc_commit(struct drm_crtc *, struct drm_crtc_state *);
static void intel_finish_crtc_commit(struct drm_crtc *, struct drm_crtc_state *);
static void intel_crtc_init_scalers(struct intel_crtc *crtc,
                                    struct intel_crtc_state *crtc_state);
static void skylake_pfit_enable(struct intel_crtc *crtc);
static void ironlake_pfit_disable(struct intel_crtc *crtc, bool force);
static void ironlake_pfit_enable(struct intel_crtc *crtc);
static void intel_modeset_setup_hw_state(struct drm_device *dev,
                                         struct drm_modeset_acquire_ctx *ctx);
static void intel_pre_disable_primary_noatomic(struct drm_crtc *crtc);

struct intel_limit {
        struct {
                int min, max;
        } dot, vco, n, m, m1, m2, p, p1;

        struct {
                int dot_limit;
                int p2_slow, p2_fast;
        } p2;
};

/* returns HPLL frequency in kHz */
int vlv_get_hpll_vco(struct drm_i915_private *dev_priv)
{
        int hpll_freq, vco_freq[] = { 800, 1600, 2000, 2400 };

        /* Obtain SKU information */
        mutex_lock(&dev_priv->sb_lock);
        hpll_freq = vlv_cck_read(dev_priv, CCK_FUSE_REG) &
                CCK_FUSE_HPLL_FREQ_MASK;
        mutex_unlock(&dev_priv->sb_lock);

        return vco_freq[hpll_freq] * 1000;
}

int vlv_get_cck_clock(struct drm_i915_private *dev_priv,
                      const char *name, u32 reg, int ref_freq)
{
        u32 val;
        int divider;

        mutex_lock(&dev_priv->sb_lock);
        val = vlv_cck_read(dev_priv, reg);
        mutex_unlock(&dev_priv->sb_lock);

        divider = val & CCK_FREQUENCY_VALUES;

        WARN((val & CCK_FREQUENCY_STATUS) !=
             (divider << CCK_FREQUENCY_STATUS_SHIFT),
             "%s change in progress\n", name);

        return DIV_ROUND_CLOSEST(ref_freq << 1, divider + 1);
}

int vlv_get_cck_clock_hpll(struct drm_i915_private *dev_priv,
                           const char *name, u32 reg)
{
        if (dev_priv->hpll_freq == 0)
                dev_priv->hpll_freq = vlv_get_hpll_vco(dev_priv);

        return vlv_get_cck_clock(dev_priv, name, reg,
                                 dev_priv->hpll_freq);
}

static void intel_update_czclk(struct drm_i915_private *dev_priv)
{
        if (!(IS_VALLEYVIEW(dev_priv) || IS_CHERRYVIEW(dev_priv)))
                return;

        dev_priv->czclk_freq = vlv_get_cck_clock_hpll(dev_priv, "czclk",
                                                      CCK_CZ_CLOCK_CONTROL);

        DRM_DEBUG_DRIVER("CZ clock rate: %d kHz\n", dev_priv->czclk_freq);
}

static inline u32 /* units of 100MHz */
intel_fdi_link_freq(struct drm_i915_private *dev_priv,
                    const struct intel_crtc_state *pipe_config)
{
        if (HAS_DDI(dev_priv))
                return pipe_config->port_clock; /* SPLL */
        else
                return dev_priv->fdi_pll_freq;
}

static const struct intel_limit intel_limits_i8xx_dac = {
        .dot = { .min = 25000, .max = 350000 },
        .vco = { .min = 908000, .max = 1512000 },
        .n = { .min = 2, .max = 16 },
        .m = { .min = 96, .max = 140 },
        .m1 = { .min = 18, .max = 26 },
        .m2 = { .min = 6, .max = 16 },
        .p = { .min = 4, .max = 128 },
        .p1 = { .min = 2, .max = 33 },
        .p2 = { .dot_limit = 165000,
                .p2_slow = 4, .p2_fast = 2 },
};

static const struct intel_limit intel_limits_i8xx_dvo = {
        .dot = { .min = 25000, .max = 350000 },
        .vco = { .min = 908000, .max = 1512000 },
        .n = { .min = 2, .max = 16 },
        .m = { .min = 96, .max = 140 },
        .m1 = { .min = 18, .max = 26 },
        .m2 = { .min = 6, .max = 16 },
        .p = { .min = 4, .max = 128 },
        .p1 = { .min = 2, .max = 33 },
        .p2 = { .dot_limit = 165000,
                .p2_slow = 4, .p2_fast = 4 },
};

static const struct intel_limit intel_limits_i8xx_lvds = {
        .dot = { .min = 25000, .max = 350000 },
        .vco = { .min = 908000, .max = 1512000 },
        .n = { .min = 2, .max = 16 },
        .m = { .min = 96, .max = 140 },
        .m1 = { .min = 18, .max = 26 },
        .m2 = { .min = 6, .max = 16 },
        .p = { .min = 4, .max = 128 },
        .p1 = { .min = 1, .max = 6 },
        .p2 = { .dot_limit = 165000,
                .p2_slow = 14, .p2_fast = 7 },
};

static const struct intel_limit intel_limits_i9xx_sdvo = {
        .dot = { .min = 20000, .max = 400000 },
        .vco = { .min = 1400000, .max = 2800000 },
        .n = { .min = 1, .max = 6 },
        .m = { .min = 70, .max = 120 },
        .m1 = { .min = 8, .max = 18 },
        .m2 = { .min = 3, .max = 7 },
        .p = { .min = 5, .max = 80 },
        .p1 = { .min = 1, .max = 8 },
        .p2 = { .dot_limit = 200000,
                .p2_slow = 10, .p2_fast = 5 },
};

static const struct intel_limit intel_limits_i9xx_lvds = {
        .dot = { .min = 20000, .max = 400000 },
        .vco = { .min = 1400000, .max = 2800000 },
        .n = { .min = 1, .max = 6 },
        .m = { .min = 70, .max = 120 },
        .m1 = { .min = 8, .max = 18 },
        .m2 = { .min = 3, .max = 7 },
        .p = { .min = 7, .max = 98 },
        .p1 = { .min = 1, .max = 8 },
        .p2 = { .dot_limit = 112000,
                .p2_slow = 14, .p2_fast = 7 },
};


static const struct intel_limit intel_limits_g4x_sdvo = {
        .dot = { .min = 25000, .max = 270000 },
        .vco = { .min = 1750000, .max = 3500000},
        .n = { .min = 1, .max = 4 },
        .m = { .min = 104, .max = 138 },
        .m1 = { .min = 17, .max = 23 },
        .m2 = { .min = 5, .max = 11 },
        .p = { .min = 10, .max = 30 },
        .p1 = { .min = 1, .max = 3},
        .p2 = { .dot_limit = 270000,
                .p2_slow = 10,
                .p2_fast = 10
        },
};

static const struct intel_limit intel_limits_g4x_hdmi = {
        .dot = { .min = 22000, .max = 400000 },
        .vco = { .min = 1750000, .max = 3500000},
        .n = { .min = 1, .max = 4 },
        .m = { .min = 104, .max = 138 },
        .m1 = { .min = 16, .max = 23 },
        .m2 = { .min = 5, .max = 11 },
        .p = { .min = 5, .max = 80 },
        .p1 = { .min = 1, .max = 8},
        .p2 = { .dot_limit = 165000,
                .p2_slow = 10, .p2_fast = 5 },
};

static const struct intel_limit intel_limits_g4x_single_channel_lvds = {
        .dot = { .min = 20000, .max = 115000 },
        .vco = { .min = 1750000, .max = 3500000 },
        .n = { .min = 1, .max = 3 },
        .m = { .min = 104, .max = 138 },
        .m1 = { .min = 17, .max = 23 },
        .m2 = { .min = 5, .max = 11 },
        .p = { .min = 28, .max = 112 },
        .p1 = { .min = 2, .max = 8 },
        .p2 = { .dot_limit = 0,
                .p2_slow = 14, .p2_fast = 14
        },
};

static const struct intel_limit intel_limits_g4x_dual_channel_lvds = {
        .dot = { .min = 80000, .max = 224000 },
        .vco = { .min = 1750000, .max = 3500000 },
        .n = { .min = 1, .max = 3 },
        .m = { .min = 104, .max = 138 },
        .m1 = { .min = 17, .max = 23 },
        .m2 = { .min = 5, .max = 11 },
        .p = { .min = 14, .max = 42 },
        .p1 = { .min = 2, .max = 6 },
        .p2 = { .dot_limit = 0,
                .p2_slow = 7, .p2_fast = 7
        },
};

static const struct intel_limit intel_limits_pineview_sdvo = {
        .dot = { .min = 20000, .max = 400000},
        .vco = { .min = 1700000, .max = 3500000 },
        /* Pineview's Ncounter is a ring counter */
        .n = { .min = 3, .max = 6 },
        .m = { .min = 2, .max = 256 },
        /* Pineview only has one combined m divider, which we treat as m2. */
        .m1 = { .min = 0, .max = 0 },
        .m2 = { .min = 0, .max = 254 },
        .p = { .min = 5, .max = 80 },
        .p1 = { .min = 1, .max = 8 },
        .p2 = { .dot_limit = 200000,
                .p2_slow = 10, .p2_fast = 5 },
};

static const struct intel_limit intel_limits_pineview_lvds = {
        .dot = { .min = 20000, .max = 400000 },
        .vco = { .min = 1700000, .max = 3500000 },
        .n = { .min = 3, .max = 6 },
        .m = { .min = 2, .max = 256 },
        .m1 = { .min = 0, .max = 0 },
        .m2 = { .min = 0, .max = 254 },
        .p = { .min = 7, .max = 112 },
        .p1 = { .min = 1, .max = 8 },
        .p2 = { .dot_limit = 112000,
                .p2_slow = 14, .p2_fast = 14 },
};

/* Ironlake / Sandybridge
 *
 * We calculate clock using (register_value + 2) for N/M1/M2, so here
 * the range value for them is (actual_value - 2).
 */
static const struct intel_limit intel_limits_ironlake_dac = {
        .dot = { .min = 25000, .max = 350000 },
        .vco = { .min = 1760000, .max = 3510000 },
        .n = { .min = 1, .max = 5 },
        .m = { .min = 79, .max = 127 },
        .m1 = { .min = 12, .max = 22 },
        .m2 = { .min = 5, .max = 9 },
        .p = { .min = 5, .max = 80 },
        .p1 = { .min = 1, .max = 8 },
        .p2 = { .dot_limit = 225000,
                .p2_slow = 10, .p2_fast = 5 },
};

static const struct intel_limit intel_limits_ironlake_single_lvds = {
        .dot = { .min = 25000, .max = 350000 },
        .vco = { .min = 1760000, .max = 3510000 },
        .n = { .min = 1, .max = 3 },
        .m = { .min = 79, .max = 118 },
        .m1 = { .min = 12, .max = 22 },
        .m2 = { .min = 5, .max = 9 },
        .p = { .min = 28, .max = 112 },
        .p1 = { .min = 2, .max = 8 },
        .p2 = { .dot_limit = 225000,
                .p2_slow = 14, .p2_fast = 14 },
};

static const struct intel_limit intel_limits_ironlake_dual_lvds = {
        .dot = { .min = 25000, .max = 350000 },
        .vco = { .min = 1760000, .max = 3510000 },
        .n = { .min = 1, .max = 3 },
        .m = { .min = 79, .max = 127 },
        .m1 = { .min = 12, .max = 22 },
        .m2 = { .min = 5, .max = 9 },
        .p = { .min = 14, .max = 56 },
        .p1 = { .min = 2, .max = 8 },
        .p2 = { .dot_limit = 225000,
                .p2_slow = 7, .p2_fast = 7 },
};

/* LVDS 100mhz refclk limits. */
static const struct intel_limit intel_limits_ironlake_single_lvds_100m = {
        .dot = { .min = 25000, .max = 350000 },
        .vco = { .min = 1760000, .max = 3510000 },
        .n = { .min = 1, .max = 2 },
        .m = { .min = 79, .max = 126 },
        .m1 = { .min = 12, .max = 22 },
        .m2 = { .min = 5, .max = 9 },
        .p = { .min = 28, .max = 112 },
        .p1 = { .min = 2, .max = 8 },
        .p2 = { .dot_limit = 225000,
                .p2_slow = 14, .p2_fast = 14 },
};

static const struct intel_limit intel_limits_ironlake_dual_lvds_100m = {
        .dot = { .min = 25000, .max = 350000 },
        .vco = { .min = 1760000, .max = 3510000 },
        .n = { .min = 1, .max = 3 },
        .m = { .min = 79, .max = 126 },
        .m1 = { .min = 12, .max = 22 },
        .m2 = { .min = 5, .max = 9 },
        .p = { .min = 14, .max = 42 },
        .p1 = { .min = 2, .max = 6 },
        .p2 = { .dot_limit = 225000,
                .p2_slow = 7, .p2_fast = 7 },
};

static const struct intel_limit intel_limits_vlv = {
         /*
          * These are the data rate limits (measured in fast clocks)
          * since those are the strictest limits we have. The fast
          * clock and actual rate limits are more relaxed, so checking
          * them would make no difference.
          */
        .dot = { .min = 25000 * 5, .max = 270000 * 5 },
        .vco = { .min = 4000000, .max = 6000000 },
        .n = { .min = 1, .max = 7 },
        .m1 = { .min = 2, .max = 3 },
        .m2 = { .min = 11, .max = 156 },
        .p1 = { .min = 2, .max = 3 },
        .p2 = { .p2_slow = 2, .p2_fast = 20 }, /* slow=min, fast=max */
};

static const struct intel_limit intel_limits_chv = {
        /*
         * These are the data rate limits (measured in fast clocks)
         * since those are the strictest limits we have.  The fast
         * clock and actual rate limits are more relaxed, so checking
         * them would make no difference.
         */
        .dot = { .min = 25000 * 5, .max = 540000 * 5},
        .vco = { .min = 4800000, .max = 6480000 },
        .n = { .min = 1, .max = 1 },
        .m1 = { .min = 2, .max = 2 },
        .m2 = { .min = 24 << 22, .max = 175 << 22 },
        .p1 = { .min = 2, .max = 4 },
        .p2 = { .p2_slow = 1, .p2_fast = 14 },
};

static const struct intel_limit intel_limits_bxt = {
        /* FIXME: find real dot limits */
        .dot = { .min = 0, .max = INT_MAX },
        .vco = { .min = 4800000, .max = 6700000 },
        .n = { .min = 1, .max = 1 },
        .m1 = { .min = 2, .max = 2 },
        /* FIXME: find real m2 limits */
        .m2 = { .min = 2 << 22, .max = 255 << 22 },
        .p1 = { .min = 2, .max = 4 },
        .p2 = { .p2_slow = 1, .p2_fast = 20 },
};

static void
skl_wa_528(struct drm_i915_private *dev_priv, int pipe, bool enable)
{
        if (IS_SKYLAKE(dev_priv) || IS_BROXTON(dev_priv))
                return;

        if (enable)
                I915_WRITE(CHICKEN_PIPESL_1(pipe), HSW_FBCQ_DIS);
        else
                I915_WRITE(CHICKEN_PIPESL_1(pipe), 0);
}

static void
skl_wa_clkgate(struct drm_i915_private *dev_priv, int pipe, bool enable)
{
        if (IS_SKYLAKE(dev_priv) || IS_BROXTON(dev_priv))
                return;

        if (enable)
                I915_WRITE(CLKGATE_DIS_PSL(pipe),
                           DUPS1_GATING_DIS | DUPS2_GATING_DIS);
        else
                I915_WRITE(CLKGATE_DIS_PSL(pipe),
                           I915_READ(CLKGATE_DIS_PSL(pipe)) &
                           ~(DUPS1_GATING_DIS | DUPS2_GATING_DIS));
}

static bool
needs_modeset(const struct drm_crtc_state *state)
{
        return drm_atomic_crtc_needs_modeset(state);
}

/*
 * Platform specific helpers to calculate the port PLL loopback- (clock.m),
 * and post-divider (clock.p) values, pre- (clock.vco) and post-divided fast
 * (clock.dot) clock rates. This fast dot clock is fed to the port's IO logic.
 * The helpers' return value is the rate of the clock that is fed to the
 * display engine's pipe which can be the above fast dot clock rate or a
 * divided-down version of it.
 */
/* m1 is reserved as 0 in Pineview, n is a ring counter */
static int pnv_calc_dpll_params(int refclk, struct dpll *clock)
{
        clock->m = clock->m2 + 2;
        clock->p = clock->p1 * clock->p2;
        if (WARN_ON(clock->n == 0 || clock->p == 0))
                return 0;
        clock->vco = DIV_ROUND_CLOSEST(refclk * clock->m, clock->n);
        clock->dot = DIV_ROUND_CLOSEST(clock->vco, clock->p);

        return clock->dot;
}

static uint32_t i9xx_dpll_compute_m(struct dpll *dpll)
{
        return 5 * (dpll->m1 + 2) + (dpll->m2 + 2);
}

static int i9xx_calc_dpll_params(int refclk, struct dpll *clock)
{
        clock->m = i9xx_dpll_compute_m(clock);
        clock->p = clock->p1 * clock->p2;
        if (WARN_ON(clock->n + 2 == 0 || clock->p == 0))
                return 0;
        clock->vco = DIV_ROUND_CLOSEST(refclk * clock->m, clock->n + 2);
        clock->dot = DIV_ROUND_CLOSEST(clock->vco, clock->p);

        return clock->dot;
}

static int vlv_calc_dpll_params(int refclk, struct dpll *clock)
{
        clock->m = clock->m1 * clock->m2;
        clock->p = clock->p1 * clock->p2;
        if (WARN_ON(clock->n == 0 || clock->p == 0))
                return 0;
        clock->vco = DIV_ROUND_CLOSEST(refclk * clock->m, clock->n);
        clock->dot = DIV_ROUND_CLOSEST(clock->vco, clock->p);

        return clock->dot / 5;
}

int chv_calc_dpll_params(int refclk, struct dpll *clock)
{
        clock->m = clock->m1 * clock->m2;
        clock->p = clock->p1 * clock->p2;
        if (WARN_ON(clock->n == 0 || clock->p == 0))
                return 0;
        clock->vco = DIV_ROUND_CLOSEST_ULL((uint64_t)refclk * clock->m,
                        clock->n << 22);
        clock->dot = DIV_ROUND_CLOSEST(clock->vco, clock->p);

        return clock->dot / 5;
}

#define INTELPllInvalid(s)   do { /* DRM_DEBUG(s); */ return false; } while (0)

/*
 * Returns whether the given set of divisors are valid for a given refclk with
 * the given connectors.
 */
static bool intel_PLL_is_valid(struct drm_i915_private *dev_priv,
                               const struct intel_limit *limit,
                               const struct dpll *clock)
{
        if (clock->n   < limit->n.min   || limit->n.max   < clock->n)
                INTELPllInvalid("n out of range\n");
        if (clock->p1  < limit->p1.min  || limit->p1.max  < clock->p1)
                INTELPllInvalid("p1 out of range\n");
        if (clock->m2  < limit->m2.min  || limit->m2.max  < clock->m2)
                INTELPllInvalid("m2 out of range\n");
        if (clock->m1  < limit->m1.min  || limit->m1.max  < clock->m1)
                INTELPllInvalid("m1 out of range\n");

        if (!IS_PINEVIEW(dev_priv) && !IS_VALLEYVIEW(dev_priv) &&
            !IS_CHERRYVIEW(dev_priv) && !IS_GEN9_LP(dev_priv))
                if (clock->m1 <= clock->m2)
                        INTELPllInvalid("m1 <= m2\n");

        if (!IS_VALLEYVIEW(dev_priv) && !IS_CHERRYVIEW(dev_priv) &&
            !IS_GEN9_LP(dev_priv)) {
                if (clock->p < limit->p.min || limit->p.max < clock->p)
                        INTELPllInvalid("p out of range\n");
                if (clock->m < limit->m.min || limit->m.max < clock->m)
                        INTELPllInvalid("m out of range\n");
        }

        if (clock->vco < limit->vco.min || limit->vco.max < clock->vco)
                INTELPllInvalid("vco out of range\n");
        /* XXX: We may need to be checking "Dot clock" depending on the multiplier,
         * connector, etc., rather than just a single range.
         */
        if (clock->dot < limit->dot.min || limit->dot.max < clock->dot)
                INTELPllInvalid("dot out of range\n");

        return true;
}

static int
i9xx_select_p2_div(const struct intel_limit *limit,
                   const struct intel_crtc_state *crtc_state,
                   int target)
{
        struct drm_device *dev = crtc_state->base.crtc->dev;

        if (intel_crtc_has_type(crtc_state, INTEL_OUTPUT_LVDS)) {
                /*
                 * For LVDS just rely on its current settings for dual-channel.
                 * We haven't figured out how to reliably set up different
                 * single/dual channel state, if we even can.
                 */
                if (intel_is_dual_link_lvds(dev))
                        return limit->p2.p2_fast;
                else
                        return limit->p2.p2_slow;
        } else {
                if (target < limit->p2.dot_limit)
                        return limit->p2.p2_slow;
                else
                        return limit->p2.p2_fast;
        }
}

/*
 * Returns a set of divisors for the desired target clock with the given
 * refclk, or FALSE.  The returned values represent the clock equation:
 * reflck * (5 * (m1 + 2) + (m2 + 2)) / (n + 2) / p1 / p2.
 *
 * Target and reference clocks are specified in kHz.
 *
 * If match_clock is provided, then best_clock P divider must match the P
 * divider from @match_clock used for LVDS downclocking.
 */
static bool
i9xx_find_best_dpll(const struct intel_limit *limit,
                    struct intel_crtc_state *crtc_state,
                    int target, int refclk, struct dpll *match_clock,
                    struct dpll *best_clock)
{
        struct drm_device *dev = crtc_state->base.crtc->dev;
        struct dpll clock;
        int err = target;

        memset(best_clock, 0, sizeof(*best_clock));

        clock.p2 = i9xx_select_p2_div(limit, crtc_state, target);

        for (clock.m1 = limit->m1.min; clock.m1 <= limit->m1.max;
             clock.m1++) {
                for (clock.m2 = limit->m2.min;
                     clock.m2 <= limit->m2.max; clock.m2++) {
                        if (clock.m2 >= clock.m1)
                                break;
                        for (clock.n = limit->n.min;
                             clock.n <= limit->n.max; clock.n++) {
                                for (clock.p1 = limit->p1.min;
                                        clock.p1 <= limit->p1.max; clock.p1++) {
                                        int this_err;

                                        i9xx_calc_dpll_params(refclk, &clock);
                                        if (!intel_PLL_is_valid(to_i915(dev),
                                                                limit,
                                                                &clock))
                                                continue;
                                        if (match_clock &&
                                            clock.p != match_clock->p)
                                                continue;

                                        this_err = abs(clock.dot - target);
                                        if (this_err < err) {
                                                *best_clock = clock;
                                                err = this_err;
                                        }
                                }
                        }
                }
        }

        return (err != target);
}

/*
 * Returns a set of divisors for the desired target clock with the given
 * refclk, or FALSE.  The returned values represent the clock equation:
 * reflck * (5 * (m1 + 2) + (m2 + 2)) / (n + 2) / p1 / p2.
 *
 * Target and reference clocks are specified in kHz.
 *
 * If match_clock is provided, then best_clock P divider must match the P
 * divider from @match_clock used for LVDS downclocking.
 */
static bool
pnv_find_best_dpll(const struct intel_limit *limit,
                   struct intel_crtc_state *crtc_state,
                   int target, int refclk, struct dpll *match_clock,
                   struct dpll *best_clock)
{
        struct drm_device *dev = crtc_state->base.crtc->dev;
        struct dpll clock;
        int err = target;

        memset(best_clock, 0, sizeof(*best_clock));

        clock.p2 = i9xx_select_p2_div(limit, crtc_state, target);

        for (clock.m1 = limit->m1.min; clock.m1 <= limit->m1.max;
             clock.m1++) {
                for (clock.m2 = limit->m2.min;
                     clock.m2 <= limit->m2.max; clock.m2++) {
                        for (clock.n = limit->n.min;
                             clock.n <= limit->n.max; clock.n++) {
                                for (clock.p1 = limit->p1.min;
                                        clock.p1 <= limit->p1.max; clock.p1++) {
                                        int this_err;

                                        pnv_calc_dpll_params(refclk, &clock);
                                        if (!intel_PLL_is_valid(to_i915(dev),
                                                                limit,
                                                                &clock))
                                                continue;
                                        if (match_clock &&
                                            clock.p != match_clock->p)
                                                continue;

                                        this_err = abs(clock.dot - target);
                                        if (this_err < err) {
                                                *best_clock = clock;
                                                err = this_err;
                                        }
                                }
                        }
                }
        }

        return (err != target);
}

/*
 * Returns a set of divisors for the desired target clock with the given
 * refclk, or FALSE.  The returned values represent the clock equation:
 * reflck * (5 * (m1 + 2) + (m2 + 2)) / (n + 2) / p1 / p2.
 *
 * Target and reference clocks are specified in kHz.
 *
 * If match_clock is provided, then best_clock P divider must match the P
 * divider from @match_clock used for LVDS downclocking.
 */
static bool
g4x_find_best_dpll(const struct intel_limit *limit,
                   struct intel_crtc_state *crtc_state,
                   int target, int refclk, struct dpll *match_clock,
                   struct dpll *best_clock)
{
        struct drm_device *dev = crtc_state->base.crtc->dev;
        struct dpll clock;
        int max_n;
        bool found = false;
        /* approximately equals target * 0.00585 */
        int err_most = (target >> 8) + (target >> 9);

        memset(best_clock, 0, sizeof(*best_clock));

        clock.p2 = i9xx_select_p2_div(limit, crtc_state, target);

        max_n = limit->n.max;
        /* based on hardware requirement, prefer smaller n to precision */
        for (clock.n = limit->n.min; clock.n <= max_n; clock.n++) {
                /* based on hardware requirement, prefere larger m1,m2 */
                for (clock.m1 = limit->m1.max;
                     clock.m1 >= limit->m1.min; clock.m1--) {
                        for (clock.m2 = limit->m2.max;
                             clock.m2 >= limit->m2.min; clock.m2--) {
                                for (clock.p1 = limit->p1.max;
                                     clock.p1 >= limit->p1.min; clock.p1--) {
                                        int this_err;

                                        i9xx_calc_dpll_params(refclk, &clock);
                                        if (!intel_PLL_is_valid(to_i915(dev),
                                                                limit,
                                                                &clock))
                                                continue;

                                        this_err = abs(clock.dot - target);
                                        if (this_err < err_most) {
                                                *best_clock = clock;
                                                err_most = this_err;
                                                max_n = clock.n;
                                                found = true;
                                        }
                                }
                        }
                }
        }
        return found;
}

/*
 * Check if the calculated PLL configuration is more optimal compared to the
 * best configuration and error found so far. Return the calculated error.
 */
static bool vlv_PLL_is_optimal(struct drm_device *dev, int target_freq,
                               const struct dpll *calculated_clock,
                               const struct dpll *best_clock,
                               unsigned int best_error_ppm,
                               unsigned int *error_ppm)
{
        /*
         * For CHV ignore the error and consider only the P value.
         * Prefer a bigger P value based on HW requirements.
         */
        if (IS_CHERRYVIEW(to_i915(dev))) {
                *error_ppm = 0;

                return calculated_clock->p > best_clock->p;
        }

        if (WARN_ON_ONCE(!target_freq))
                return false;

        *error_ppm = div_u64(1000000ULL *
                                abs(target_freq - calculated_clock->dot),
                             target_freq);
        /*
         * Prefer a better P value over a better (smaller) error if the error
         * is small. Ensure this preference for future configurations too by
         * setting the error to 0.
         */
        if (*error_ppm < 100 && calculated_clock->p > best_clock->p) {
                *error_ppm = 0;

                return true;
        }

        return *error_ppm + 10 < best_error_ppm;
}

/*
 * Returns a set of divisors for the desired target clock with the given
 * refclk, or FALSE.  The returned values represent the clock equation:
 * reflck * (5 * (m1 + 2) + (m2 + 2)) / (n + 2) / p1 / p2.
 */
static bool
vlv_find_best_dpll(const struct intel_limit *limit,
                   struct intel_crtc_state *crtc_state,
                   int target, int refclk, struct dpll *match_clock,
                   struct dpll *best_clock)
{
        struct intel_crtc *crtc = to_intel_crtc(crtc_state->base.crtc);
        struct drm_device *dev = crtc->base.dev;
        struct dpll clock;
        unsigned int bestppm = 1000000;
        /* min update 19.2 MHz */
        int max_n = min(limit->n.max, refclk / 19200);
        bool found = false;

        target *= 5; /* fast clock */

        memset(best_clock, 0, sizeof(*best_clock));

        /* based on hardware requirement, prefer smaller n to precision */
        for (clock.n = limit->n.min; clock.n <= max_n; clock.n++) {
                for (clock.p1 = limit->p1.max; clock.p1 >= limit->p1.min; clock.p1--) {
                        for (clock.p2 = limit->p2.p2_fast; clock.p2 >= limit->p2.p2_slow;
                             clock.p2 -= clock.p2 > 10 ? 2 : 1) {
                                clock.p = clock.p1 * clock.p2;
                                /* based on hardware requirement, prefer bigger m1,m2 values */
                                for (clock.m1 = limit->m1.min; clock.m1 <= limit->m1.max; clock.m1++) {
                                        unsigned int ppm;

                                        clock.m2 = DIV_ROUND_CLOSEST(target * clock.p * clock.n,
                                                                     refclk * clock.m1);

                                        vlv_calc_dpll_params(refclk, &clock);

                                        if (!intel_PLL_is_valid(to_i915(dev),
                                                                limit,
                                                                &clock))
                                                continue;

                                        if (!vlv_PLL_is_optimal(dev, target,
                                                                &clock,
                                                                best_clock,
                                                                bestppm, &ppm))
                                                continue;

                                        *best_clock = clock;
                                        bestppm = ppm;
                                        found = true;
                                }
                        }
                }
        }

        return found;
}

/*
 * Returns a set of divisors for the desired target clock with the given
 * refclk, or FALSE.  The returned values represent the clock equation:
 * reflck * (5 * (m1 + 2) + (m2 + 2)) / (n + 2) / p1 / p2.
 */
static bool
chv_find_best_dpll(const struct intel_limit *limit,
                   struct intel_crtc_state *crtc_state,
                   int target, int refclk, struct dpll *match_clock,
                   struct dpll *best_clock)
{
        struct intel_crtc *crtc = to_intel_crtc(crtc_state->base.crtc);
        struct drm_device *dev = crtc->base.dev;
        unsigned int best_error_ppm;
        struct dpll clock;
        uint64_t m2;
        int found = false;

        memset(best_clock, 0, sizeof(*best_clock));
        best_error_ppm = 1000000;

        /*
         * Based on hardware doc, the n always set to 1, and m1 always
         * set to 2.  If requires to support 200Mhz refclk, we need to
         * revisit this because n may not 1 anymore.
         */
        clock.n = 1, clock.m1 = 2;
        target *= 5;    /* fast clock */

        for (clock.p1 = limit->p1.max; clock.p1 >= limit->p1.min; clock.p1--) {
                for (clock.p2 = limit->p2.p2_fast;
                                clock.p2 >= limit->p2.p2_slow;
                                clock.p2 -= clock.p2 > 10 ? 2 : 1) {
                        unsigned int error_ppm;

                        clock.p = clock.p1 * clock.p2;

                        m2 = DIV_ROUND_CLOSEST_ULL(((uint64_t)target * clock.p *
                                        clock.n) << 22, refclk * clock.m1);

                        if (m2 > INT_MAX/clock.m1)
                                continue;

                        clock.m2 = m2;

                        chv_calc_dpll_params(refclk, &clock);

                        if (!intel_PLL_is_valid(to_i915(dev), limit, &clock))
                                continue;

                        if (!vlv_PLL_is_optimal(dev, target, &clock, best_clock,
                                                best_error_ppm, &error_ppm))
                                continue;

                        *best_clock = clock;
                        best_error_ppm = error_ppm;
                        found = true;
                }
        }

        return found;
}

bool bxt_find_best_dpll(struct intel_crtc_state *crtc_state, int target_clock,
                        struct dpll *best_clock)
{
        int refclk = 100000;
        const struct intel_limit *limit = &intel_limits_bxt;

        return chv_find_best_dpll(limit, crtc_state,
                                  target_clock, refclk, NULL, best_clock);
}

bool intel_crtc_active(struct intel_crtc *crtc)
{
        /* Be paranoid as we can arrive here with only partial
         * state retrieved from the hardware during setup.
         *
         * We can ditch the adjusted_mode.crtc_clock check as soon
         * as Haswell has gained clock readout/fastboot support.
         *
         * We can ditch the crtc->primary->state->fb check as soon as we can
         * properly reconstruct framebuffers.
         *
         * FIXME: The intel_crtc->active here should be switched to
         * crtc->state->active once we have proper CRTC states wired up
         * for atomic.
         */
        return crtc->active && crtc->base.primary->state->fb &&
                crtc->config->base.adjusted_mode.crtc_clock;
}

enum transcoder intel_pipe_to_cpu_transcoder(struct drm_i915_private *dev_priv,
                                             enum i915_pipe pipe)
{
        struct intel_crtc *crtc = intel_get_crtc_for_pipe(dev_priv, pipe);

        return crtc->config->cpu_transcoder;
}

static bool pipe_scanline_is_moving(struct drm_i915_private *dev_priv,
                                    enum i915_pipe pipe)
{
        i915_reg_t reg = PIPEDSL(pipe);
        u32 line1, line2;
        u32 line_mask;

        if (IS_GEN2(dev_priv))
                line_mask = DSL_LINEMASK_GEN2;
        else
                line_mask = DSL_LINEMASK_GEN3;

        line1 = I915_READ(reg) & line_mask;
        msleep(5);
        line2 = I915_READ(reg) & line_mask;

        return line1 != line2;
}

static void wait_for_pipe_scanline_moving(struct intel_crtc *crtc, bool state)
{
        struct drm_i915_private *dev_priv = to_i915(crtc->base.dev);
        enum i915_pipe pipe = crtc->pipe;

        /* Wait for the display line to settle/start moving */
        if (wait_for(pipe_scanline_is_moving(dev_priv, pipe) == state, 100))
                DRM_ERROR("pipe %c scanline %s wait timed out\n",
                          pipe_name(pipe), onoff(state));
}

static void intel_wait_for_pipe_scanline_stopped(struct intel_crtc *crtc)
{
        wait_for_pipe_scanline_moving(crtc, false);
}

static void intel_wait_for_pipe_scanline_moving(struct intel_crtc *crtc)
{
        wait_for_pipe_scanline_moving(crtc, true);
}

static void
intel_wait_for_pipe_off(const struct intel_crtc_state *old_crtc_state)
{
        struct intel_crtc *crtc = to_intel_crtc(old_crtc_state->base.crtc);
        struct drm_i915_private *dev_priv = to_i915(crtc->base.dev);

        if (INTEL_GEN(dev_priv) >= 4) {
                enum transcoder cpu_transcoder = old_crtc_state->cpu_transcoder;
                i915_reg_t reg = PIPECONF(cpu_transcoder);

                /* Wait for the Pipe State to go off */
                if (intel_wait_for_register(dev_priv,
                                            reg, I965_PIPECONF_ACTIVE, 0,
                                            100))
                        WARN(1, "pipe_off wait timed out\n");
        } else {
                intel_wait_for_pipe_scanline_stopped(crtc);
        }
}

/* Only for pre-ILK configs */
void assert_pll(struct drm_i915_private *dev_priv,
                enum i915_pipe pipe, bool state)
{
        u32 val;
        bool cur_state;

        val = I915_READ(DPLL(pipe));
        cur_state = !!(val & DPLL_VCO_ENABLE);
        I915_STATE_WARN(cur_state != state,
             "PLL state assertion failure (expected %s, current %s)\n",
                        onoff(state), onoff(cur_state));
}

/* XXX: the dsi pll is shared between MIPI DSI ports */
void assert_dsi_pll(struct drm_i915_private *dev_priv, bool state)
{
        u32 val;
        bool cur_state;

        mutex_lock(&dev_priv->sb_lock);
        val = vlv_cck_read(dev_priv, CCK_REG_DSI_PLL_CONTROL);
        mutex_unlock(&dev_priv->sb_lock);

        cur_state = val & DSI_PLL_VCO_EN;
        I915_STATE_WARN(cur_state != state,
             "DSI PLL state assertion failure (expected %s, current %s)\n",
                        onoff(state), onoff(cur_state));
}

static void assert_fdi_tx(struct drm_i915_private *dev_priv,
                          enum i915_pipe pipe, bool state)
{
        bool cur_state;
        enum transcoder cpu_transcoder = intel_pipe_to_cpu_transcoder(dev_priv,
                                                                      pipe);

        if (HAS_DDI(dev_priv)) {
                /* DDI does not have a specific FDI_TX register */
                u32 val = I915_READ(TRANS_DDI_FUNC_CTL(cpu_transcoder));
                cur_state = !!(val & TRANS_DDI_FUNC_ENABLE);
        } else {
                u32 val = I915_READ(FDI_TX_CTL(pipe));
                cur_state = !!(val & FDI_TX_ENABLE);
        }
        I915_STATE_WARN(cur_state != state,
             "FDI TX state assertion failure (expected %s, current %s)\n",
                        onoff(state), onoff(cur_state));
}
#define assert_fdi_tx_enabled(d, p) assert_fdi_tx(d, p, true)
#define assert_fdi_tx_disabled(d, p) assert_fdi_tx(d, p, false)

static void assert_fdi_rx(struct drm_i915_private *dev_priv,
                          enum i915_pipe pipe, bool state)
{
        u32 val;
        bool cur_state;

        val = I915_READ(FDI_RX_CTL(pipe));
        cur_state = !!(val & FDI_RX_ENABLE);
        I915_STATE_WARN(cur_state != state,
             "FDI RX state assertion failure (expected %s, current %s)\n",
                        onoff(state), onoff(cur_state));
}
#define assert_fdi_rx_enabled(d, p) assert_fdi_rx(d, p, true)
#define assert_fdi_rx_disabled(d, p) assert_fdi_rx(d, p, false)

static void assert_fdi_tx_pll_enabled(struct drm_i915_private *dev_priv,
                                      enum i915_pipe pipe)
{
        u32 val;

        /* ILK FDI PLL is always enabled */
        if (IS_GEN5(dev_priv))
                return;

        /* On Haswell, DDI ports are responsible for the FDI PLL setup */
        if (HAS_DDI(dev_priv))
                return;

        val = I915_READ(FDI_TX_CTL(pipe));
        I915_STATE_WARN(!(val & FDI_TX_PLL_ENABLE), "FDI TX PLL assertion failure, should be active but is disabled\n");
}

void assert_fdi_rx_pll(struct drm_i915_private *dev_priv,
                       enum i915_pipe pipe, bool state)
{
        u32 val;
        bool cur_state;

        val = I915_READ(FDI_RX_CTL(pipe));
        cur_state = !!(val & FDI_RX_PLL_ENABLE);
        I915_STATE_WARN(cur_state != state,
             "FDI RX PLL assertion failure (expected %s, current %s)\n",
                        onoff(state), onoff(cur_state));
}

void assert_panel_unlocked(struct drm_i915_private *dev_priv, enum i915_pipe pipe)
{
        i915_reg_t pp_reg;
        u32 val;
        enum i915_pipe panel_pipe = INVALID_PIPE;
        bool locked = true;

        if (WARN_ON(HAS_DDI(dev_priv)))
                return;

        if (HAS_PCH_SPLIT(dev_priv)) {
                u32 port_sel;

                pp_reg = PP_CONTROL(0);
                port_sel = I915_READ(PP_ON_DELAYS(0)) & PANEL_PORT_SELECT_MASK;

                switch (port_sel) {
                case PANEL_PORT_SELECT_LVDS:
                        intel_lvds_port_enabled(dev_priv, PCH_LVDS, &panel_pipe);
                        break;
                case PANEL_PORT_SELECT_DPA:
                        intel_dp_port_enabled(dev_priv, DP_A, PORT_A, &panel_pipe);
                        break;
                case PANEL_PORT_SELECT_DPC:
                        intel_dp_port_enabled(dev_priv, PCH_DP_C, PORT_C, &panel_pipe);
                        break;
                case PANEL_PORT_SELECT_DPD:
                        intel_dp_port_enabled(dev_priv, PCH_DP_D, PORT_D, &panel_pipe);
                        break;
                default:
                        MISSING_CASE(port_sel);
                        break;
                }
        } else if (IS_VALLEYVIEW(dev_priv) || IS_CHERRYVIEW(dev_priv)) {
                /* presumably write lock depends on pipe, not port select */
                pp_reg = PP_CONTROL(pipe);
                panel_pipe = pipe;
        } else {
                u32 port_sel;

                pp_reg = PP_CONTROL(0);
                port_sel = I915_READ(PP_ON_DELAYS(0)) & PANEL_PORT_SELECT_MASK;

                WARN_ON(port_sel != PANEL_PORT_SELECT_LVDS);
                intel_lvds_port_enabled(dev_priv, LVDS, &panel_pipe);
        }

        val = I915_READ(pp_reg);
        if (!(val & PANEL_POWER_ON) ||
            ((val & PANEL_UNLOCK_MASK) == PANEL_UNLOCK_REGS))
                locked = false;

        I915_STATE_WARN(panel_pipe == pipe && locked,
             "panel assertion failure, pipe %c regs locked\n",
             pipe_name(pipe));
}

void assert_pipe(struct drm_i915_private *dev_priv,
                 enum i915_pipe pipe, bool state)
{
        bool cur_state;
        enum transcoder cpu_transcoder = intel_pipe_to_cpu_transcoder(dev_priv,
                                                                      pipe);
        enum intel_display_power_domain power_domain;

        /* we keep both pipes enabled on 830 */
        if (IS_I830(dev_priv))
                state = true;

        power_domain = POWER_DOMAIN_TRANSCODER(cpu_transcoder);
        if (intel_display_power_get_if_enabled(dev_priv, power_domain)) {
                u32 val = I915_READ(PIPECONF(cpu_transcoder));
                cur_state = !!(val & PIPECONF_ENABLE);

                intel_display_power_put(dev_priv, power_domain);
        } else {
                cur_state = false;
        }

        I915_STATE_WARN(cur_state != state,
             "pipe %c assertion failure (expected %s, current %s)\n",
                        pipe_name(pipe), onoff(state), onoff(cur_state));
}

static void assert_plane(struct intel_plane *plane, bool state)
{
        enum i915_pipe pipe;
        bool cur_state;

        cur_state = plane->get_hw_state(plane, &pipe);

        I915_STATE_WARN(cur_state != state,
                        "%s assertion failure (expected %s, current %s)\n",
                        plane->base.name, onoff(state), onoff(cur_state));
}

#define assert_plane_enabled(p) assert_plane(p, true)
#define assert_plane_disabled(p) assert_plane(p, false)

static void assert_planes_disabled(struct intel_crtc *crtc)
{
        struct drm_i915_private *dev_priv = to_i915(crtc->base.dev);
        struct intel_plane *plane;

        for_each_intel_plane_on_crtc(&dev_priv->drm, crtc, plane)
                assert_plane_disabled(plane);
}

static void assert_vblank_disabled(struct drm_crtc *crtc)
{
        if (I915_STATE_WARN_ON(drm_crtc_vblank_get(crtc) == 0))
                drm_crtc_vblank_put(crtc);
}

void assert_pch_transcoder_disabled(struct drm_i915_private *dev_priv,
                                    enum i915_pipe pipe)
{
        u32 val;
        bool enabled;

        val = I915_READ(PCH_TRANSCONF(pipe));
        enabled = !!(val & TRANS_ENABLE);
        I915_STATE_WARN(enabled,
             "transcoder assertion failed, should be off on pipe %c but is still active\n",
             pipe_name(pipe));
}

static void assert_pch_dp_disabled(struct drm_i915_private *dev_priv,
                                   enum i915_pipe pipe, enum port port,
                                   i915_reg_t dp_reg)
{
        enum i915_pipe port_pipe;
        bool state;

        state = intel_dp_port_enabled(dev_priv, dp_reg, port, &port_pipe);

        I915_STATE_WARN(state && port_pipe == pipe,
                        "PCH DP %c enabled on transcoder %c, should be disabled\n",
                        port_name(port), pipe_name(pipe));

        I915_STATE_WARN(HAS_PCH_IBX(dev_priv) && !state && port_pipe == PIPE_B,
                        "IBX PCH DP %c still using transcoder B\n",
                        port_name(port));
}

static void assert_pch_hdmi_disabled(struct drm_i915_private *dev_priv,
                                     enum i915_pipe pipe, enum port port,
                                     i915_reg_t hdmi_reg)
{
        enum i915_pipe port_pipe;
        bool state;

        state = intel_sdvo_port_enabled(dev_priv, hdmi_reg, &port_pipe);

        I915_STATE_WARN(state && port_pipe == pipe,
                        "PCH HDMI %c enabled on transcoder %c, should be disabled\n",
                        port_name(port), pipe_name(pipe));

        I915_STATE_WARN(HAS_PCH_IBX(dev_priv) && !state && port_pipe == PIPE_B,
                        "IBX PCH HDMI %c still using transcoder B\n",
                        port_name(port));
}

static void assert_pch_ports_disabled(struct drm_i915_private *dev_priv,
                                      enum i915_pipe pipe)
{
        enum i915_pipe port_pipe;

        assert_pch_dp_disabled(dev_priv, pipe, PORT_B, PCH_DP_B);
        assert_pch_dp_disabled(dev_priv, pipe, PORT_C, PCH_DP_C);
        assert_pch_dp_disabled(dev_priv, pipe, PORT_D, PCH_DP_D);

        I915_STATE_WARN(intel_crt_port_enabled(dev_priv, PCH_ADPA, &port_pipe) &&
                        port_pipe == pipe,
                        "PCH VGA enabled on transcoder %c, should be disabled\n",
                        pipe_name(pipe));

        I915_STATE_WARN(intel_lvds_port_enabled(dev_priv, PCH_LVDS, &port_pipe) &&
                        port_pipe == pipe,
                        "PCH LVDS enabled on transcoder %c, should be disabled\n",
                        pipe_name(pipe));

        assert_pch_hdmi_disabled(dev_priv, pipe, PORT_B, PCH_HDMIB);
        assert_pch_hdmi_disabled(dev_priv, pipe, PORT_C, PCH_HDMIC);
        assert_pch_hdmi_disabled(dev_priv, pipe, PORT_D, PCH_HDMID);
}

static void _vlv_enable_pll(struct intel_crtc *crtc,
                            const struct intel_crtc_state *pipe_config)
{
        struct drm_i915_private *dev_priv = to_i915(crtc->base.dev);
        enum i915_pipe pipe = crtc->pipe;

        I915_WRITE(DPLL(pipe), pipe_config->dpll_hw_state.dpll);
        POSTING_READ(DPLL(pipe));
        udelay(150);

        if (intel_wait_for_register(dev_priv,
                                    DPLL(pipe),
                                    DPLL_LOCK_VLV,
                                    DPLL_LOCK_VLV,
                                    1))
                DRM_ERROR("DPLL %d failed to lock\n", pipe);
}

static void vlv_enable_pll(struct intel_crtc *crtc,
                           const struct intel_crtc_state *pipe_config)
{
        struct drm_i915_private *dev_priv = to_i915(crtc->base.dev);
        enum i915_pipe pipe = crtc->pipe;

        assert_pipe_disabled(dev_priv, pipe);

        /* PLL is protected by panel, make sure we can write it */
        assert_panel_unlocked(dev_priv, pipe);

        if (pipe_config->dpll_hw_state.dpll & DPLL_VCO_ENABLE)
                _vlv_enable_pll(crtc, pipe_config);

        I915_WRITE(DPLL_MD(pipe), pipe_config->dpll_hw_state.dpll_md);
        POSTING_READ(DPLL_MD(pipe));
}


static void _chv_enable_pll(struct intel_crtc *crtc,
                            const struct intel_crtc_state *pipe_config)
{
        struct drm_i915_private *dev_priv = to_i915(crtc->base.dev);
        enum i915_pipe pipe = crtc->pipe;
        enum dpio_channel port = vlv_pipe_to_channel(pipe);
        u32 tmp;

        mutex_lock(&dev_priv->sb_lock);

        /* Enable back the 10bit clock to display controller */
        tmp = vlv_dpio_read(dev_priv, pipe, CHV_CMN_DW14(port));
        tmp |= DPIO_DCLKP_EN;
        vlv_dpio_write(dev_priv, pipe, CHV_CMN_DW14(port), tmp);

        mutex_unlock(&dev_priv->sb_lock);

        /*
         * Need to wait > 100ns between dclkp clock enable bit and PLL enable.
         */
        udelay(1);

        /* Enable PLL */
        I915_WRITE(DPLL(pipe), pipe_config->dpll_hw_state.dpll);

        /* Check PLL is locked */
        if (intel_wait_for_register(dev_priv,
                                    DPLL(pipe), DPLL_LOCK_VLV, DPLL_LOCK_VLV,
                                    1))
                DRM_ERROR("PLL %d failed to lock\n", pipe);
}

static void chv_enable_pll(struct intel_crtc *crtc,
                           const struct intel_crtc_state *pipe_config)
{
        struct drm_i915_private *dev_priv = to_i915(crtc->base.dev);
        enum i915_pipe pipe = crtc->pipe;

        assert_pipe_disabled(dev_priv, pipe);

        /* PLL is protected by panel, make sure we can write it */
        assert_panel_unlocked(dev_priv, pipe);

        if (pipe_config->dpll_hw_state.dpll & DPLL_VCO_ENABLE)
                _chv_enable_pll(crtc, pipe_config);

        if (pipe != PIPE_A) {
                /*
                 * WaPixelRepeatModeFixForC0:chv
                 *
                 * DPLLCMD is AWOL. Use chicken bits to propagate
                 * the value from DPLLBMD to either pipe B or C.
                 */
                I915_WRITE(CBR4_VLV, CBR_DPLLBMD_PIPE(pipe));
                I915_WRITE(DPLL_MD(PIPE_B), pipe_config->dpll_hw_state.dpll_md);
                I915_WRITE(CBR4_VLV, 0);
                dev_priv->chv_dpll_md[pipe] = pipe_config->dpll_hw_state.dpll_md;

                /*
                 * DPLLB VGA mode also seems to cause problems.
                 * We should always have it disabled.
                 */
                WARN_ON((I915_READ(DPLL(PIPE_B)) & DPLL_VGA_MODE_DIS) == 0);
        } else {
                I915_WRITE(DPLL_MD(pipe), pipe_config->dpll_hw_state.dpll_md);
                POSTING_READ(DPLL_MD(pipe));
        }
}

static int intel_num_dvo_pipes(struct drm_i915_private *dev_priv)
{
        struct intel_crtc *crtc;
        int count = 0;

        for_each_intel_crtc(&dev_priv->drm, crtc) {
                count += crtc->base.state->active &&
                        intel_crtc_has_type(crtc->config, INTEL_OUTPUT_DVO);
        }

        return count;
}

static void i9xx_enable_pll(struct intel_crtc *crtc,
                            const struct intel_crtc_state *crtc_state)
{
        struct drm_i915_private *dev_priv = to_i915(crtc->base.dev);
        i915_reg_t reg = DPLL(crtc->pipe);
        u32 dpll = crtc_state->dpll_hw_state.dpll;
        int i;

        assert_pipe_disabled(dev_priv, crtc->pipe);

        /* PLL is protected by panel, make sure we can write it */
        if (IS_MOBILE(dev_priv) && !IS_I830(dev_priv))
                assert_panel_unlocked(dev_priv, crtc->pipe);

        /* Enable DVO 2x clock on both PLLs if necessary */
        if (IS_I830(dev_priv) && intel_num_dvo_pipes(dev_priv) > 0) {
                /*
                 * It appears to be important that we don't enable this
                 * for the current pipe before otherwise configuring the
                 * PLL. No idea how this should be handled if multiple
                 * DVO outputs are enabled simultaneosly.
                 */
                dpll |= DPLL_DVO_2X_MODE;
                I915_WRITE(DPLL(!crtc->pipe),
                           I915_READ(DPLL(!crtc->pipe)) | DPLL_DVO_2X_MODE);
        }

        /*
         * Apparently we need to have VGA mode enabled prior to changing
         * the P1/P2 dividers. Otherwise the DPLL will keep using the old
         * dividers, even though the register value does change.
         */
        I915_WRITE(reg, 0);

        I915_WRITE(reg, dpll);

        /* Wait for the clocks to stabilize. */
        POSTING_READ(reg);
        udelay(150);

        if (INTEL_GEN(dev_priv) >= 4) {
                I915_WRITE(DPLL_MD(crtc->pipe),
                           crtc_state->dpll_hw_state.dpll_md);
        } else {
                /* The pixel multiplier can only be updated once the
                 * DPLL is enabled and the clocks are stable.
                 *
                 * So write it again.
                 */
                I915_WRITE(reg, dpll);
        }

        /* We do this three times for luck */
        for (i = 0; i < 3; i++) {
                I915_WRITE(reg, dpll);
                POSTING_READ(reg);
                udelay(150); /* wait for warmup */
        }
}

static void i9xx_disable_pll(struct intel_crtc *crtc)
{
        struct drm_i915_private *dev_priv = to_i915(crtc->base.dev);
        enum i915_pipe pipe = crtc->pipe;

        /* Disable DVO 2x clock on both PLLs if necessary */
        if (IS_I830(dev_priv) &&
            intel_crtc_has_type(crtc->config, INTEL_OUTPUT_DVO) &&
            !intel_num_dvo_pipes(dev_priv)) {
                I915_WRITE(DPLL(PIPE_B),
                           I915_READ(DPLL(PIPE_B)) & ~DPLL_DVO_2X_MODE);
                I915_WRITE(DPLL(PIPE_A),
                           I915_READ(DPLL(PIPE_A)) & ~DPLL_DVO_2X_MODE);
        }

        /* Don't disable pipe or pipe PLLs if needed */
        if (IS_I830(dev_priv))
                return;

        /* Make sure the pipe isn't still relying on us */
        assert_pipe_disabled(dev_priv, pipe);

        I915_WRITE(DPLL(pipe), DPLL_VGA_MODE_DIS);
        POSTING_READ(DPLL(pipe));
}

static void vlv_disable_pll(struct drm_i915_private *dev_priv, enum i915_pipe pipe)
{
        u32 val;

        /* Make sure the pipe isn't still relying on us */
        assert_pipe_disabled(dev_priv, pipe);

        val = DPLL_INTEGRATED_REF_CLK_VLV |
                DPLL_REF_CLK_ENABLE_VLV | DPLL_VGA_MODE_DIS;
        if (pipe != PIPE_A)
                val |= DPLL_INTEGRATED_CRI_CLK_VLV;

        I915_WRITE(DPLL(pipe), val);
        POSTING_READ(DPLL(pipe));
}

static void chv_disable_pll(struct drm_i915_private *dev_priv, enum i915_pipe pipe)
{
        enum dpio_channel port = vlv_pipe_to_channel(pipe);
        u32 val;

        /* Make sure the pipe isn't still relying on us */
        assert_pipe_disabled(dev_priv, pipe);

        val = DPLL_SSC_REF_CLK_CHV |
                DPLL_REF_CLK_ENABLE_VLV | DPLL_VGA_MODE_DIS;
        if (pipe != PIPE_A)
                val |= DPLL_INTEGRATED_CRI_CLK_VLV;

        I915_WRITE(DPLL(pipe), val);
        POSTING_READ(DPLL(pipe));

        mutex_lock(&dev_priv->sb_lock);

        /* Disable 10bit clock to display controller */
        val = vlv_dpio_read(dev_priv, pipe, CHV_CMN_DW14(port));
        val &= ~DPIO_DCLKP_EN;
        vlv_dpio_write(dev_priv, pipe, CHV_CMN_DW14(port), val);

        mutex_unlock(&dev_priv->sb_lock);
}

void vlv_wait_port_ready(struct drm_i915_private *dev_priv,
                         struct intel_digital_port *dport,
                         unsigned int expected_mask)
{
        u32 port_mask;
        i915_reg_t dpll_reg;

        switch (dport->base.port) {
        case PORT_B:
                port_mask = DPLL_PORTB_READY_MASK;
                dpll_reg = DPLL(0);
                break;
        case PORT_C:
                port_mask = DPLL_PORTC_READY_MASK;
                dpll_reg = DPLL(0);
                expected_mask <<= 4;
                break;
        case PORT_D:
                port_mask = DPLL_PORTD_READY_MASK;
                dpll_reg = DPIO_PHY_STATUS;
                break;
        default:
                BUG();
        }

        if (intel_wait_for_register(dev_priv,
                                    dpll_reg, port_mask, expected_mask,
                                    1000))
                WARN(1, "timed out waiting for port %c ready: got 0x%x, expected 0x%x\n",
                     port_name(dport->base.port),
                     I915_READ(dpll_reg) & port_mask, expected_mask);
}

static void ironlake_enable_pch_transcoder(struct drm_i915_private *dev_priv,
                                           enum i915_pipe pipe)
{
        struct intel_crtc *intel_crtc = intel_get_crtc_for_pipe(dev_priv,
                                                                pipe);
        i915_reg_t reg;
        uint32_t val, pipeconf_val;

        /* Make sure PCH DPLL is enabled */
        assert_shared_dpll_enabled(dev_priv, intel_crtc->config->shared_dpll);

        /* FDI must be feeding us bits for PCH ports */
        assert_fdi_tx_enabled(dev_priv, pipe);
        assert_fdi_rx_enabled(dev_priv, pipe);

        if (HAS_PCH_CPT(dev_priv)) {
                /* Workaround: Set the timing override bit before enabling the
                 * pch transcoder. */
                reg = TRANS_CHICKEN2(pipe);
                val = I915_READ(reg);
                val |= TRANS_CHICKEN2_TIMING_OVERRIDE;
                I915_WRITE(reg, val);
        }

        reg = PCH_TRANSCONF(pipe);
        val = I915_READ(reg);
        pipeconf_val = I915_READ(PIPECONF(pipe));

        if (HAS_PCH_IBX(dev_priv)) {
                /*
                 * Make the BPC in transcoder be consistent with
                 * that in pipeconf reg. For HDMI we must use 8bpc
                 * here for both 8bpc and 12bpc.
                 */
                val &= ~PIPECONF_BPC_MASK;
                if (intel_crtc_has_type(intel_crtc->config, INTEL_OUTPUT_HDMI))
                        val |= PIPECONF_8BPC;
                else
                        val |= pipeconf_val & PIPECONF_BPC_MASK;
        }

        val &= ~TRANS_INTERLACE_MASK;
        if ((pipeconf_val & PIPECONF_INTERLACE_MASK) == PIPECONF_INTERLACED_ILK)
                if (HAS_PCH_IBX(dev_priv) &&
                    intel_crtc_has_type(intel_crtc->config, INTEL_OUTPUT_SDVO))
                        val |= TRANS_LEGACY_INTERLACED_ILK;
                else
                        val |= TRANS_INTERLACED;
        else
                val |= TRANS_PROGRESSIVE;

        I915_WRITE(reg, val | TRANS_ENABLE);
        if (intel_wait_for_register(dev_priv,
                                    reg, TRANS_STATE_ENABLE, TRANS_STATE_ENABLE,
                                    100))
                DRM_ERROR("failed to enable transcoder %c\n", pipe_name(pipe));
}

static void lpt_enable_pch_transcoder(struct drm_i915_private *dev_priv,
                                      enum transcoder cpu_transcoder)
{
        u32 val, pipeconf_val;

        /* FDI must be feeding us bits for PCH ports */
        assert_fdi_tx_enabled(dev_priv, (enum i915_pipe) cpu_transcoder);
        assert_fdi_rx_enabled(dev_priv, PIPE_A);

        /* Workaround: set timing override bit. */
        val = I915_READ(TRANS_CHICKEN2(PIPE_A));
        val |= TRANS_CHICKEN2_TIMING_OVERRIDE;
        I915_WRITE(TRANS_CHICKEN2(PIPE_A), val);

        val = TRANS_ENABLE;
        pipeconf_val = I915_READ(PIPECONF(cpu_transcoder));

        if ((pipeconf_val & PIPECONF_INTERLACE_MASK_HSW) ==
            PIPECONF_INTERLACED_ILK)
                val |= TRANS_INTERLACED;
        else
                val |= TRANS_PROGRESSIVE;

        I915_WRITE(LPT_TRANSCONF, val);
        if (intel_wait_for_register(dev_priv,
                                    LPT_TRANSCONF,
                                    TRANS_STATE_ENABLE,
                                    TRANS_STATE_ENABLE,
                                    100))
                DRM_ERROR("Failed to enable PCH transcoder\n");
}

static void ironlake_disable_pch_transcoder(struct drm_i915_private *dev_priv,
                                            enum i915_pipe pipe)
{
        i915_reg_t reg;
        uint32_t val;

        /* FDI relies on the transcoder */
        assert_fdi_tx_disabled(dev_priv, pipe);
        assert_fdi_rx_disabled(dev_priv, pipe);

        /* Ports must be off as well */
        assert_pch_ports_disabled(dev_priv, pipe);

        reg = PCH_TRANSCONF(pipe);
        val = I915_READ(reg);
        val &= ~TRANS_ENABLE;
        I915_WRITE(reg, val);
        /* wait for PCH transcoder off, transcoder state */
        if (intel_wait_for_register(dev_priv,
                                    reg, TRANS_STATE_ENABLE, 0,
                                    50))
                DRM_ERROR("failed to disable transcoder %c\n", pipe_name(pipe));

        if (HAS_PCH_CPT(dev_priv)) {
                /* Workaround: Clear the timing override chicken bit again. */
                reg = TRANS_CHICKEN2(pipe);
                val = I915_READ(reg);
                val &= ~TRANS_CHICKEN2_TIMING_OVERRIDE;
                I915_WRITE(reg, val);
        }
}

void lpt_disable_pch_transcoder(struct drm_i915_private *dev_priv)
{
        u32 val;

        val = I915_READ(LPT_TRANSCONF);
        val &= ~TRANS_ENABLE;
        I915_WRITE(LPT_TRANSCONF, val);
        /* wait for PCH transcoder off, transcoder state */
        if (intel_wait_for_register(dev_priv,
                                    LPT_TRANSCONF, TRANS_STATE_ENABLE, 0,
                                    50))
                DRM_ERROR("Failed to disable PCH transcoder\n");

        /* Workaround: clear timing override bit. */
        val = I915_READ(TRANS_CHICKEN2(PIPE_A));
        val &= ~TRANS_CHICKEN2_TIMING_OVERRIDE;
        I915_WRITE(TRANS_CHICKEN2(PIPE_A), val);
}

enum i915_pipe intel_crtc_pch_transcoder(struct intel_crtc *crtc)
{
        struct drm_i915_private *dev_priv = to_i915(crtc->base.dev);

        if (HAS_PCH_LPT(dev_priv))
                return PIPE_A;
        else
                return crtc->pipe;
}

static void intel_enable_pipe(const struct intel_crtc_state *new_crtc_state)
{
        struct intel_crtc *crtc = to_intel_crtc(new_crtc_state->base.crtc);
        struct drm_i915_private *dev_priv = to_i915(crtc->base.dev);
        enum transcoder cpu_transcoder = new_crtc_state->cpu_transcoder;
        enum i915_pipe pipe = crtc->pipe;
        i915_reg_t reg;
        u32 val;

        DRM_DEBUG_KMS("enabling pipe %c\n", pipe_name(pipe));

        assert_planes_disabled(crtc);

        /*
         * A pipe without a PLL won't actually be able to drive bits from
         * a plane.  On ILK+ the pipe PLLs are integrated, so we don't
         * need the check.
         */
        if (HAS_GMCH_DISPLAY(dev_priv)) {
                if (intel_crtc_has_type(new_crtc_state, INTEL_OUTPUT_DSI))
                        assert_dsi_pll_enabled(dev_priv);
                else
                        assert_pll_enabled(dev_priv, pipe);
        } else {
                if (new_crtc_state->has_pch_encoder) {
                        /* if driving the PCH, we need FDI enabled */
                        assert_fdi_rx_pll_enabled(dev_priv,
                                                  intel_crtc_pch_transcoder(crtc));
                        assert_fdi_tx_pll_enabled(dev_priv,
                                                  (enum i915_pipe) cpu_transcoder);
                }
                /* FIXME: assert CPU port conditions for SNB+ */
        }

        reg = PIPECONF(cpu_transcoder);
        val = I915_READ(reg);
        if (val & PIPECONF_ENABLE) {
                /* we keep both pipes enabled on 830 */
                WARN_ON(!IS_I830(dev_priv));
                return;
        }

        I915_WRITE(reg, val | PIPECONF_ENABLE);
        POSTING_READ(reg);

        /*
         * Until the pipe starts PIPEDSL reads will return a stale value,
         * which causes an apparent vblank timestamp jump when PIPEDSL
         * resets to its proper value. That also messes up the frame count
         * when it's derived from the timestamps. So let's wait for the
         * pipe to start properly before we call drm_crtc_vblank_on()
         */
        if (dev_priv->drm.max_vblank_count == 0)
                intel_wait_for_pipe_scanline_moving(crtc);
}

static void intel_disable_pipe(const struct intel_crtc_state *old_crtc_state)
{
        struct intel_crtc *crtc = to_intel_crtc(old_crtc_state->base.crtc);
        struct drm_i915_private *dev_priv = to_i915(crtc->base.dev);
        enum transcoder cpu_transcoder = old_crtc_state->cpu_transcoder;
        enum i915_pipe pipe = crtc->pipe;
        i915_reg_t reg;
        u32 val;

        DRM_DEBUG_KMS("disabling pipe %c\n", pipe_name(pipe));

        /*
         * Make sure planes won't keep trying to pump pixels to us,
         * or we might hang the display.
         */
        assert_planes_disabled(crtc);

        reg = PIPECONF(cpu_transcoder);
        val = I915_READ(reg);
        if ((val & PIPECONF_ENABLE) == 0)
                return;

        /*
         * Double wide has implications for planes
         * so best keep it disabled when not needed.
         */
        if (old_crtc_state->double_wide)
                val &= ~PIPECONF_DOUBLE_WIDE;

        /* Don't disable pipe or pipe PLLs if needed */
        if (!IS_I830(dev_priv))
                val &= ~PIPECONF_ENABLE;

        I915_WRITE(reg, val);
        if ((val & PIPECONF_ENABLE) == 0)
                intel_wait_for_pipe_off(old_crtc_state);
}

static unsigned int intel_tile_size(const struct drm_i915_private *dev_priv)
{
        return IS_GEN2(dev_priv) ? 2048 : 4096;
}

static unsigned int
intel_tile_width_bytes(const struct drm_framebuffer *fb, int color_plane)
{
        struct drm_i915_private *dev_priv = to_i915(fb->dev);
        unsigned int cpp = fb->format->cpp[color_plane];

        switch (fb->modifier) {
        case DRM_FORMAT_MOD_LINEAR:
                return cpp;
        case I915_FORMAT_MOD_X_TILED:
                if (IS_GEN2(dev_priv))
                        return 128;
                else
                        return 512;
        case I915_FORMAT_MOD_Y_TILED_CCS:
                if (color_plane == 1)
                        return 128;
                /* fall through */
        case I915_FORMAT_MOD_Y_TILED:
                if (IS_GEN2(dev_priv) || HAS_128_BYTE_Y_TILING(dev_priv))
                        return 128;
                else
                        return 512;
        case I915_FORMAT_MOD_Yf_TILED_CCS:
                if (color_plane == 1)
                        return 128;
                /* fall through */
        case I915_FORMAT_MOD_Yf_TILED:
                switch (cpp) {
                case 1:
                        return 64;
                case 2:
                case 4:
                        return 128;
                case 8:
                case 16:
                        return 256;
                default:
                        MISSING_CASE(cpp);
                        return cpp;
                }
                break;
        default:
                MISSING_CASE(fb->modifier);
                return cpp;
        }
}

static unsigned int
intel_tile_height(const struct drm_framebuffer *fb, int color_plane)
{
        if (fb->modifier == DRM_FORMAT_MOD_LINEAR)
                return 1;
        else
                return intel_tile_size(to_i915(fb->dev)) /
                        intel_tile_width_bytes(fb, color_plane);
}

/* Return the tile dimensions in pixel units */
static void intel_tile_dims(const struct drm_framebuffer *fb, int color_plane,
                            unsigned int *tile_width,
                            unsigned int *tile_height)
{
        unsigned int tile_width_bytes = intel_tile_width_bytes(fb, color_plane);
        unsigned int cpp = fb->format->cpp[color_plane];

        *tile_width = tile_width_bytes / cpp;
        *tile_height = intel_tile_size(to_i915(fb->dev)) / tile_width_bytes;
}

unsigned int
intel_fb_align_height(const struct drm_framebuffer *fb,
                      int color_plane, unsigned int height)
{
        unsigned int tile_height = intel_tile_height(fb, color_plane);

        return ALIGN(height, tile_height);
}

unsigned int intel_rotation_info_size(const struct intel_rotation_info *rot_info)
{
        unsigned int size = 0;
        int i;

        for (i = 0 ; i < ARRAY_SIZE(rot_info->plane); i++)
                size += rot_info->plane[i].width * rot_info->plane[i].height;

        return size;
}

static void
intel_fill_fb_ggtt_view(struct i915_ggtt_view *view,
                        const struct drm_framebuffer *fb,
                        unsigned int rotation)
{
        view->type = I915_GGTT_VIEW_NORMAL;
        if (drm_rotation_90_or_270(rotation)) {
                view->type = I915_GGTT_VIEW_ROTATED;
                view->rotated = to_intel_framebuffer(fb)->rot_info;
        }
}

static unsigned int intel_cursor_alignment(const struct drm_i915_private *dev_priv)
{
        if (IS_I830(dev_priv))
                return 16 * 1024;
        else if (IS_I85X(dev_priv))
                return 256;
        else if (IS_I845G(dev_priv) || IS_I865G(dev_priv))
                return 32;
        else
                return 4 * 1024;
}

static unsigned int intel_linear_alignment(const struct drm_i915_private *dev_priv)
{
        if (INTEL_GEN(dev_priv) >= 9)
                return 256 * 1024;
        else if (IS_I965G(dev_priv) || IS_I965GM(dev_priv) ||
                 IS_VALLEYVIEW(dev_priv) || IS_CHERRYVIEW(dev_priv))
                return 128 * 1024;
        else if (INTEL_GEN(dev_priv) >= 4)
                return 4 * 1024;
        else
                return 0;
}

static unsigned int intel_surf_alignment(const struct drm_framebuffer *fb,
                                         int color_plane)
{
        struct drm_i915_private *dev_priv = to_i915(fb->dev);

        /* AUX_DIST needs only 4K alignment */
        if (color_plane == 1)
                return 4096;

        switch (fb->modifier) {
        case DRM_FORMAT_MOD_LINEAR:
                return intel_linear_alignment(dev_priv);
        case I915_FORMAT_MOD_X_TILED:
                if (INTEL_GEN(dev_priv) >= 9)
                        return 256 * 1024;
                return 0;
        case I915_FORMAT_MOD_Y_TILED_CCS:
        case I915_FORMAT_MOD_Yf_TILED_CCS:
        case I915_FORMAT_MOD_Y_TILED:
        case I915_FORMAT_MOD_Yf_TILED:
                return 1 * 1024 * 1024;
        default:
                MISSING_CASE(fb->modifier);
                return 0;
        }
}

static bool intel_plane_uses_fence(const struct intel_plane_state *plane_state)
{
        struct intel_plane *plane = to_intel_plane(plane_state->base.plane);
        struct drm_i915_private *dev_priv = to_i915(plane->base.dev);

        return INTEL_GEN(dev_priv) < 4 || plane->has_fbc;
}

struct i915_vma *
intel_pin_and_fence_fb_obj(struct drm_framebuffer *fb,
                           const struct i915_ggtt_view *view,
                           bool uses_fence,
                           unsigned long *out_flags)
{
        struct drm_device *dev = fb->dev;
        struct drm_i915_private *dev_priv = to_i915(dev);
        struct drm_i915_gem_object *obj = intel_fb_obj(fb);
        struct i915_vma *vma;
        unsigned int pinctl;
        u32 alignment;

        WARN_ON(!mutex_is_locked(&dev->struct_mutex));

        alignment = intel_surf_alignment(fb, 0);

        /* Note that the w/a also requires 64 PTE of padding following the
         * bo. We currently fill all unused PTE with the shadow page and so
         * we should always have valid PTE following the scanout preventing
         * the VT-d warning.
         */
        if (intel_scanout_needs_vtd_wa(dev_priv) && alignment < 256 * 1024)
                alignment = 256 * 1024;

        /*
         * Global gtt pte registers are special registers which actually forward
         * writes to a chunk of system memory. Which means that there is no risk
         * that the register values disappear as soon as we call
         * intel_runtime_pm_put(), so it is correct to wrap only the
         * pin/unpin/fence and not more.
         */
        intel_runtime_pm_get(dev_priv);

        atomic_inc(&dev_priv->gpu_error.pending_fb_pin);

        pinctl = 0;

        /* Valleyview is definitely limited to scanning out the first
         * 512MiB. Lets presume this behaviour was inherited from the
         * g4x display engine and that all earlier gen are similarly
         * limited. Testing suggests that it is a little more
         * complicated than this. For example, Cherryview appears quite
         * happy to scanout from anywhere within its global aperture.
         */
        if (HAS_GMCH_DISPLAY(dev_priv))
                pinctl |= PIN_MAPPABLE;

        vma = i915_gem_object_pin_to_display_plane(obj,
                                                   alignment, view, pinctl);
        if (IS_ERR(vma))
                goto err;

        if (uses_fence && i915_vma_is_map_and_fenceable(vma)) {
                int ret;

                /* Install a fence for tiled scan-out. Pre-i965 always needs a
                 * fence, whereas 965+ only requires a fence if using
                 * framebuffer compression.  For simplicity, we always, when
                 * possible, install a fence as the cost is not that onerous.
                 *
                 * If we fail to fence the tiled scanout, then either the
                 * modeset will reject the change (which is highly unlikely as
                 * the affected systems, all but one, do not have unmappable
                 * space) or we will not be able to enable full powersaving
                 * techniques (also likely not to apply due to various limits
                 * FBC and the like impose on the size of the buffer, which
                 * presumably we violated anyway with this unmappable buffer).
                 * Anyway, it is presumably better to stumble onwards with
                 * something and try to run the system in a "less than optimal"
                 * mode that matches the user configuration.
                 */
                ret = i915_vma_pin_fence(vma);
                if (ret != 0 && INTEL_GEN(dev_priv) < 4) {
                        i915_gem_object_unpin_from_display_plane(vma);
                        vma = ERR_PTR(ret);
                        goto err;
                }

                if (ret == 0 && vma->fence)
                        *out_flags |= PLANE_HAS_FENCE;
        }

        i915_vma_get(vma);
err:
        atomic_dec(&dev_priv->gpu_error.pending_fb_pin);

        intel_runtime_pm_put(dev_priv);
        return vma;
}

void intel_unpin_fb_vma(struct i915_vma *vma, unsigned long flags)
{
        lockdep_assert_held(&vma->vm->i915->drm.struct_mutex);

        if (flags & PLANE_HAS_FENCE)
                i915_vma_unpin_fence(vma);
        i915_gem_object_unpin_from_display_plane(vma);
        i915_vma_put(vma);
}

static int intel_fb_pitch(const struct drm_framebuffer *fb, int color_plane,
                          unsigned int rotation)
{
        if (drm_rotation_90_or_270(rotation))
                return to_intel_framebuffer(fb)->rotated[color_plane].pitch;
        else
                return fb->pitches[color_plane];
}

/*
 * Convert the x/y offsets into a linear offset.
 * Only valid with 0/180 degree rotation, which is fine since linear
 * offset is only used with linear buffers on pre-hsw and tiled buffers
 * with gen2/3, and 90/270 degree rotations isn't supported on any of them.
 */
u32 intel_fb_xy_to_linear(int x, int y,
                          const struct intel_plane_state *state,
                          int color_plane)
{
        const struct drm_framebuffer *fb = state->base.fb;
        unsigned int cpp = fb->format->cpp[color_plane];
        unsigned int pitch = state->color_plane[color_plane].stride;

        return y * pitch + x * cpp;
}

/*
 * Add the x/y offsets derived from fb->offsets[] to the user
 * specified plane src x/y offsets. The resulting x/y offsets
 * specify the start of scanout from the beginning of the gtt mapping.
 */
void intel_add_fb_offsets(int *x, int *y,
                          const struct intel_plane_state *state,
                          int color_plane)

{
        const struct intel_framebuffer *intel_fb = to_intel_framebuffer(state->base.fb);
        unsigned int rotation = state->base.rotation;

        if (drm_rotation_90_or_270(rotation)) {
                *x += intel_fb->rotated[color_plane].x;
                *y += intel_fb->rotated[color_plane].y;
        } else {
                *x += intel_fb->normal[color_plane].x;
                *y += intel_fb->normal[color_plane].y;
        }
}

static u32 intel_adjust_tile_offset(int *x, int *y,
                                    unsigned int tile_width,
                                    unsigned int tile_height,
                                    unsigned int tile_size,
                                    unsigned int pitch_tiles,
                                    u32 old_offset,
                                    u32 new_offset)
{
        unsigned int pitch_pixels = pitch_tiles * tile_width;
        unsigned int tiles;

        WARN_ON(old_offset & (tile_size - 1));
        WARN_ON(new_offset & (tile_size - 1));
        WARN_ON(new_offset > old_offset);

        tiles = (old_offset - new_offset) / tile_size;

        *y += tiles / pitch_tiles * tile_height;
        *x += tiles % pitch_tiles * tile_width;

        /* minimize x in case it got needlessly big */
        *y += *x / pitch_pixels * tile_height;
        *x %= pitch_pixels;

        return new_offset;
}

static u32 intel_adjust_aligned_offset(int *x, int *y,
                                       const struct drm_framebuffer *fb,
                                       int color_plane,
                                       unsigned int rotation,
                                       unsigned int pitch,
                                       u32 old_offset, u32 new_offset)
{
        struct drm_i915_private *dev_priv = to_i915(fb->dev);
        unsigned int cpp = fb->format->cpp[color_plane];

        WARN_ON(new_offset > old_offset);

        if (fb->modifier != DRM_FORMAT_MOD_LINEAR) {
                unsigned int tile_size, tile_width, tile_height;
                unsigned int pitch_tiles;

                tile_size = intel_tile_size(dev_priv);
                intel_tile_dims(fb, color_plane, &tile_width, &tile_height);

                if (drm_rotation_90_or_270(rotation)) {
                        pitch_tiles = pitch / tile_height;
                        swap(tile_width, tile_height);
                } else {
                        pitch_tiles = pitch / (tile_width * cpp);
                }

                intel_adjust_tile_offset(x, y, tile_width, tile_height,
                                         tile_size, pitch_tiles,
                                         old_offset, new_offset);
        } else {
                old_offset += *y * pitch + *x * cpp;

                *y = (old_offset - new_offset) / pitch;
                *x = ((old_offset - new_offset) - *y * pitch) / cpp;
        }

        return new_offset;
}

/*
 * Adjust the tile offset by moving the difference into
 * the x/y offsets.
 */
static u32 intel_plane_adjust_aligned_offset(int *x, int *y,
                                             const struct intel_plane_state *state,
                                             int color_plane,
                                             u32 old_offset, u32 new_offset)
{
        return intel_adjust_aligned_offset(x, y, state->base.fb, color_plane,
                                           state->base.rotation,
                                           state->color_plane[color_plane].stride,
                                           old_offset, new_offset);
}

/*
 * Computes the aligned offset to the base tile and adjusts
 * x, y. bytes per pixel is assumed to be a power-of-two.
 *
 * In the 90/270 rotated case, x and y are assumed
 * to be already rotated to match the rotated GTT view, and
 * pitch is the tile_height aligned framebuffer height.
 *
 * This function is used when computing the derived information
 * under intel_framebuffer, so using any of that information
 * here is not allowed. Anything under drm_framebuffer can be
 * used. This is why the user has to pass in the pitch since it
 * is specified in the rotated orientation.
 */
static u32 intel_compute_aligned_offset(struct drm_i915_private *dev_priv,
                                        int *x, int *y,
                                        const struct drm_framebuffer *fb,
                                        int color_plane,
                                        unsigned int pitch,
                                        unsigned int rotation,
                                        u32 alignment)
{
        uint64_t fb_modifier = fb->modifier;
        unsigned int cpp = fb->format->cpp[color_plane];
        u32 offset, offset_aligned;

        if (alignment)
                alignment--;

        if (fb_modifier != DRM_FORMAT_MOD_LINEAR) {
                unsigned int tile_size, tile_width, tile_height;
                unsigned int tile_rows, tiles, pitch_tiles;

                tile_size = intel_tile_size(dev_priv);
                intel_tile_dims(fb, color_plane, &tile_width, &tile_height);

                if (drm_rotation_90_or_270(rotation)) {
                        pitch_tiles = pitch / tile_height;
                        swap(tile_width, tile_height);
                } else {
                        pitch_tiles = pitch / (tile_width * cpp);
                }

                tile_rows = *y / tile_height;
                *y %= tile_height;

                tiles = *x / tile_width;
                *x %= tile_width;

                offset = (tile_rows * pitch_tiles + tiles) * tile_size;
                offset_aligned = offset & ~alignment;

                intel_adjust_tile_offset(x, y, tile_width, tile_height,
                                         tile_size, pitch_tiles,
                                         offset, offset_aligned);
        } else {
                offset = *y * pitch + *x * cpp;
                offset_aligned = offset & ~alignment;

                *y = (offset & alignment) / pitch;
                *x = ((offset & alignment) - *y * pitch) / cpp;
        }

        return offset_aligned;
}

static u32 intel_plane_compute_aligned_offset(int *x, int *y,
                                              const struct intel_plane_state *state,
                                              int color_plane)
{
        struct intel_plane *intel_plane = to_intel_plane(state->base.plane);
        struct drm_i915_private *dev_priv = to_i915(intel_plane->base.dev);
        const struct drm_framebuffer *fb = state->base.fb;
        unsigned int rotation = state->base.rotation;
        int pitch = state->color_plane[color_plane].stride;
        u32 alignment;

        if (intel_plane->id == PLANE_CURSOR)
                alignment = intel_cursor_alignment(dev_priv);
        else
                alignment = intel_surf_alignment(fb, color_plane);

        return intel_compute_aligned_offset(dev_priv, x, y, fb, color_plane,
                                            pitch, rotation, alignment);
}

/* Convert the fb->offset[] into x/y offsets */
static int intel_fb_offset_to_xy(int *x, int *y,
                                 const struct drm_framebuffer *fb,
                                 int color_plane)
{
        struct drm_i915_private *dev_priv = to_i915(fb->dev);

        if (fb->modifier != DRM_FORMAT_MOD_LINEAR &&
            fb->offsets[color_plane] % intel_tile_size(dev_priv))
                return -EINVAL;

        *x = 0;
        *y = 0;

        intel_adjust_aligned_offset(x, y,
                                    fb, color_plane, DRM_MODE_ROTATE_0,
                                    fb->pitches[color_plane],
                                    fb->offsets[color_plane], 0);

        return 0;
}

static unsigned int intel_fb_modifier_to_tiling(uint64_t fb_modifier)
{
        switch (fb_modifier) {
        case I915_FORMAT_MOD_X_TILED:
                return I915_TILING_X;
        case I915_FORMAT_MOD_Y_TILED:
        case I915_FORMAT_MOD_Y_TILED_CCS:
                return I915_TILING_Y;
        default:
                return I915_TILING_NONE;
        }
}

/*
 * From the Sky Lake PRM:
 * "The Color Control Surface (CCS) contains the compression status of
 *  the cache-line pairs. The compression state of the cache-line pair
 *  is specified by 2 bits in the CCS. Each CCS cache-line represents
 *  an area on the main surface of 16 x16 sets of 128 byte Y-tiled
 *  cache-line-pairs. CCS is always Y tiled."
 *
 * Since cache line pairs refers to horizontally adjacent cache lines,
 * each cache line in the CCS corresponds to an area of 32x16 cache
 * lines on the main surface. Since each pixel is 4 bytes, this gives
 * us a ratio of one byte in the CCS for each 8x16 pixels in the
 * main surface.
 */
static const struct drm_format_info ccs_formats[] = {
        { .format = DRM_FORMAT_XRGB8888, .depth = 24, .num_planes = 2, .cpp = { 4, 1, }, .hsub = 8, .vsub = 16, },
        { .format = DRM_FORMAT_XBGR8888, .depth = 24, .num_planes = 2, .cpp = { 4, 1, }, .hsub = 8, .vsub = 16, },
        { .format = DRM_FORMAT_ARGB8888, .depth = 32, .num_planes = 2, .cpp = { 4, 1, }, .hsub = 8, .vsub = 16, },
        { .format = DRM_FORMAT_ABGR8888, .depth = 32, .num_planes = 2, .cpp = { 4, 1, }, .hsub = 8, .vsub = 16, },
};

static const struct drm_format_info *
lookup_format_info(const struct drm_format_info formats[],
                   int num_formats, u32 format)
{
        int i;

        for (i = 0; i < num_formats; i++) {
                if (formats[i].format == format)
                        return &formats[i];
        }

        return NULL;
}

static const struct drm_format_info *
intel_get_format_info(const struct drm_mode_fb_cmd2 *cmd)
{
        switch (cmd->modifier[0]) {
        case I915_FORMAT_MOD_Y_TILED_CCS:
        case I915_FORMAT_MOD_Yf_TILED_CCS:
                return lookup_format_info(ccs_formats,
                                          ARRAY_SIZE(ccs_formats),
                                          cmd->pixel_format);
        default:
                return NULL;
        }
}

bool is_ccs_modifier(u64 modifier)
{
        return modifier == I915_FORMAT_MOD_Y_TILED_CCS ||
               modifier == I915_FORMAT_MOD_Yf_TILED_CCS;
}

static int
intel_fill_fb_info(struct drm_i915_private *dev_priv,
                   struct drm_framebuffer *fb)
{
        struct intel_framebuffer *intel_fb = to_intel_framebuffer(fb);
        struct intel_rotation_info *rot_info = &intel_fb->rot_info;
        struct drm_i915_gem_object *obj = intel_fb_obj(fb);
        u32 gtt_offset_rotated = 0;
        unsigned int max_size = 0;
        int i, num_planes = fb->format->num_planes;
        unsigned int tile_size = intel_tile_size(dev_priv);

        for (i = 0; i < num_planes; i++) {
                unsigned int width, height;
                unsigned int cpp, size;
                u32 offset;
                int x, y;
                int ret;

                cpp = fb->format->cpp[i];
                width = drm_framebuffer_plane_width(fb->width, fb, i);
                height = drm_framebuffer_plane_height(fb->height, fb, i);

                ret = intel_fb_offset_to_xy(&x, &y, fb, i);
                if (ret) {
                        DRM_DEBUG_KMS("bad fb plane %d offset: 0x%x\n",
                                      i, fb->offsets[i]);
                        return ret;
                }

                if (is_ccs_modifier(fb->modifier) && i == 1) {
                        int hsub = fb->format->hsub;
                        int vsub = fb->format->vsub;
                        int tile_width, tile_height;
                        int main_x, main_y;
                        int ccs_x, ccs_y;

                        intel_tile_dims(fb, i, &tile_width, &tile_height);
                        tile_width *= hsub;
                        tile_height *= vsub;

                        ccs_x = (x * hsub) % tile_width;
                        ccs_y = (y * vsub) % tile_height;
                        main_x = intel_fb->normal[0].x % tile_width;
                        main_y = intel_fb->normal[0].y % tile_height;

                        /*
                         * CCS doesn't have its own x/y offset register, so the intra CCS tile
                         * x/y offsets must match between CCS and the main surface.
                         */
                        if (main_x != ccs_x || main_y != ccs_y) {
                                DRM_DEBUG_KMS("Bad CCS x/y (main %d,%d ccs %d,%d) full (main %d,%d ccs %d,%d)\n",
                                              main_x, main_y,
                                              ccs_x, ccs_y,
                                              intel_fb->normal[0].x,
                                              intel_fb->normal[0].y,
                                              x, y);
                                return -EINVAL;
                        }
                }

                /*
                 * The fence (if used) is aligned to the start of the object
                 * so having the framebuffer wrap around across the edge of the
                 * fenced region doesn't really work. We have no API to configure
                 * the fence start offset within the object (nor could we probably
                 * on gen2/3). So it's just easier if we just require that the
                 * fb layout agrees with the fence layout. We already check that the
                 * fb stride matches the fence stride elsewhere.
                 */
                if (i == 0 && i915_gem_object_is_tiled(obj) &&
                    (x + width) * cpp > fb->pitches[i]) {
                        DRM_DEBUG_KMS("bad fb plane %d offset: 0x%x\n",
                                      i, fb->offsets[i]);
                        return -EINVAL;
                }

                /*
                 * First pixel of the framebuffer from
                 * the start of the normal gtt mapping.
                 */
                intel_fb->normal[i].x = x;
                intel_fb->normal[i].y = y;

                offset = intel_compute_aligned_offset(dev_priv, &x, &y, fb, i,
                                                      fb->pitches[i],
                                                      DRM_MODE_ROTATE_0,
                                                      tile_size);
                offset /= tile_size;

                if (fb->modifier != DRM_FORMAT_MOD_LINEAR) {
                        unsigned int tile_width, tile_height;
                        unsigned int pitch_tiles;
                        struct drm_rect r;

                        intel_tile_dims(fb, i, &tile_width, &tile_height);

                        rot_info->plane[i].offset = offset;
                        rot_info->plane[i].stride = DIV_ROUND_UP(fb->pitches[i], tile_width * cpp);
                        rot_info->plane[i].width = DIV_ROUND_UP(x + width, tile_width);
                        rot_info->plane[i].height = DIV_ROUND_UP(y + height, tile_height);

                        intel_fb->rotated[i].pitch =
                                rot_info->plane[i].height * tile_height;

                        /* how many tiles does this plane need */
                        size = rot_info->plane[i].stride * rot_info->plane[i].height;
                        /*
                         * If the plane isn't horizontally tile aligned,
                         * we need one more tile.
                         */
                        if (x != 0)
                                size++;

                        /* rotate the x/y offsets to match the GTT view */
                        r.x1 = x;
                        r.y1 = y;
                        r.x2 = x + width;
                        r.y2 = y + height;
                        drm_rect_rotate(&r,
                                        rot_info->plane[i].width * tile_width,
                                        rot_info->plane[i].height * tile_height,
                                        DRM_MODE_ROTATE_270);
                        x = r.x1;
                        y = r.y1;

                        /* rotate the tile dimensions to match the GTT view */
                        pitch_tiles = intel_fb->rotated[i].pitch / tile_height;
                        swap(tile_width, tile_height);

                        /*
                         * We only keep the x/y offsets, so push all of the
                         * gtt offset into the x/y offsets.
                         */
                        intel_adjust_tile_offset(&x, &y,
                                                 tile_width, tile_height,
                                                 tile_size, pitch_tiles,
                                                 gtt_offset_rotated * tile_size, 0);

                        gtt_offset_rotated += rot_info->plane[i].width * rot_info->plane[i].height;

                        /*
                         * First pixel of the framebuffer from
                         * the start of the rotated gtt mapping.
                         */
                        intel_fb->rotated[i].x = x;
                        intel_fb->rotated[i].y = y;
                } else {
                        size = DIV_ROUND_UP((y + height) * fb->pitches[i] +
                                            x * cpp, tile_size);
                }

                /* how many tiles in total needed in the bo */
                max_size = max(max_size, offset + size);
        }

        if (mul_u32_u32(max_size, tile_size) > obj->base.size) {
                DRM_DEBUG_KMS("fb too big for bo (need %llu bytes, have %zu bytes)\n",
                              mul_u32_u32(max_size, tile_size), obj->base.size);
                return -EINVAL;
        }

        return 0;
}

static int i9xx_format_to_fourcc(int format)
{
        switch (format) {
        case DISPPLANE_8BPP:
                return DRM_FORMAT_C8;
        case DISPPLANE_BGRX555:
                return DRM_FORMAT_XRGB1555;
        case DISPPLANE_BGRX565:
                return DRM_FORMAT_RGB565;
        default:
        case DISPPLANE_BGRX888:
                return DRM_FORMAT_XRGB8888;
        case DISPPLANE_RGBX888:
                return DRM_FORMAT_XBGR8888;
        case DISPPLANE_BGRX101010:
                return DRM_FORMAT_XRGB2101010;
        case DISPPLANE_RGBX101010:
                return DRM_FORMAT_XBGR2101010;
        }
}

int skl_format_to_fourcc(int format, bool rgb_order, bool alpha)
{
        switch (format) {
        case PLANE_CTL_FORMAT_RGB_565:
                return DRM_FORMAT_RGB565;
        case PLANE_CTL_FORMAT_NV12:
                return DRM_FORMAT_NV12;
        default:
        case PLANE_CTL_FORMAT_XRGB_8888:
                if (rgb_order) {
                        if (alpha)
                                return DRM_FORMAT_ABGR8888;
                        else
                                return DRM_FORMAT_XBGR8888;
                } else {
                        if (alpha)
                                return DRM_FORMAT_ARGB8888;
                        else
                                return DRM_FORMAT_XRGB8888;
                }
        case PLANE_CTL_FORMAT_XRGB_2101010:
                if (rgb_order)
                        return DRM_FORMAT_XBGR2101010;
                else
                        return DRM_FORMAT_XRGB2101010;
        }
}

static bool
intel_alloc_initial_plane_obj(struct intel_crtc *crtc,
                              struct intel_initial_plane_config *plane_config)
{
        struct drm_device *dev = crtc->base.dev;
        struct drm_i915_private *dev_priv = to_i915(dev);
        struct drm_i915_gem_object *obj = NULL;
        struct drm_mode_fb_cmd2 mode_cmd = { 0 };
        struct drm_framebuffer *fb = &plane_config->fb->base;
        u32 base_aligned = round_down(plane_config->base, PAGE_SIZE);
        u32 size_aligned = round_up(plane_config->base + plane_config->size,
                                    PAGE_SIZE);

        size_aligned -= base_aligned;

        if (plane_config->size == 0)
                return false;

        /* If the FB is too big, just don't use it since fbdev is not very
         * important and we should probably use that space with FBC or other
         * features. */
        if (size_aligned * 2 > dev_priv->stolen_usable_size)
                return false;

        switch (fb->modifier) {
        case DRM_FORMAT_MOD_LINEAR:
        case I915_FORMAT_MOD_X_TILED:
        case I915_FORMAT_MOD_Y_TILED:
                break;
        default:
                DRM_DEBUG_DRIVER("Unsupported modifier for initial FB: 0x%lx\n",
                                 fb->modifier);
                return false;
        }

        mutex_lock(&dev->struct_mutex);
        obj = i915_gem_object_create_stolen_for_preallocated(dev_priv,
                                                             base_aligned,
                                                             base_aligned,
                                                             size_aligned);
        mutex_unlock(&dev->struct_mutex);
        if (!obj)
                return false;

        switch (plane_config->tiling) {
        case I915_TILING_NONE:
                break;
        case I915_TILING_X:
        case I915_TILING_Y:
                obj->tiling_and_stride = fb->pitches[0] | plane_config->tiling;
                break;
        default:
                MISSING_CASE(plane_config->tiling);
                return false;
        }

        mode_cmd.pixel_format = fb->format->format;
        mode_cmd.width = fb->width;
        mode_cmd.height = fb->height;
        mode_cmd.pitches[0] = fb->pitches[0];
        mode_cmd.modifier[0] = fb->modifier;
        mode_cmd.flags = DRM_MODE_FB_MODIFIERS;

        if (intel_framebuffer_init(to_intel_framebuffer(fb), obj, &mode_cmd)) {
                DRM_DEBUG_KMS("intel fb init failed\n");
                goto out_unref_obj;
        }


        DRM_DEBUG_KMS("initial plane fb obj %p\n", obj);
        return true;

out_unref_obj:
        i915_gem_object_put(obj);
        return false;
}

static void
intel_set_plane_visible(struct intel_crtc_state *crtc_state,
                        struct intel_plane_state *plane_state,
                        bool visible)
{
        struct intel_plane *plane = to_intel_plane(plane_state->base.plane);

        plane_state->base.visible = visible;

        if (visible)
                crtc_state->base.plane_mask |= drm_plane_mask(&plane->base);
        else
                crtc_state->base.plane_mask &= ~drm_plane_mask(&plane->base);

        DRM_DEBUG_KMS("%s active planes 0x%x\n",
                      crtc_state->base.crtc->name,
                      crtc_state->active_planes);
}

static void fixup_active_planes(struct intel_crtc_state *crtc_state)
{
        struct drm_i915_private *dev_priv = to_i915(crtc_state->base.crtc->dev);
        struct drm_plane *plane;

        /*
         * Active_planes aliases if multiple "primary" or cursor planes
         * have been used on the same (or wrong) pipe. plane_mask uses
         * unique ids, hence we can use that to reconstruct active_planes.
         */
        crtc_state->active_planes = 0;

        drm_for_each_plane_mask(plane, &dev_priv->drm,
                                crtc_state->base.plane_mask)
                crtc_state->active_planes |= BIT(to_intel_plane(plane)->id);
}

static void intel_plane_disable_noatomic(struct intel_crtc *crtc,
                                         struct intel_plane *plane)
{
        struct intel_crtc_state *crtc_state =
                to_intel_crtc_state(crtc->base.state);
        struct intel_plane_state *plane_state =
                to_intel_plane_state(plane->base.state);

        intel_set_plane_visible(crtc_state, plane_state, false);
        fixup_active_planes(crtc_state);

        if (plane->id == PLANE_PRIMARY)
                intel_pre_disable_primary_noatomic(&crtc->base);

        trace_intel_disable_plane(&plane->base, crtc);
        plane->disable_plane(plane, crtc);
}

static void
intel_find_initial_plane_obj(struct intel_crtc *intel_crtc,
                             struct intel_initial_plane_config *plane_config)
{
        struct drm_device *dev = intel_crtc->base.dev;
        struct drm_i915_private *dev_priv = to_i915(dev);
        struct drm_crtc *c;
        struct drm_i915_gem_object *obj;
        struct drm_plane *primary = intel_crtc->base.primary;
        struct drm_plane_state *plane_state = primary->state;
        struct intel_plane *intel_plane = to_intel_plane(primary);
        struct intel_plane_state *intel_state =
                to_intel_plane_state(plane_state);
        struct drm_framebuffer *fb;

        if (!plane_config->fb)
                return;

        if (intel_alloc_initial_plane_obj(intel_crtc, plane_config)) {
                fb = &plane_config->fb->base;
                goto valid_fb;
        }

        kfree(plane_config->fb);

        /*
         * Failed to alloc the obj, check to see if we should share
         * an fb with another CRTC instead
         */
        for_each_crtc(dev, c) {
                struct intel_plane_state *state;

                if (c == &intel_crtc->base)
                        continue;

                if (!to_intel_crtc(c)->active)
                        continue;

                state = to_intel_plane_state(c->primary->state);
                if (!state->vma)
                        continue;

                if (intel_plane_ggtt_offset(state) == plane_config->base) {
                        fb = state->base.fb;
                        drm_framebuffer_get(fb);
                        goto valid_fb;
                }
        }

        /*
         * We've failed to reconstruct the BIOS FB.  Current display state
         * indicates that the primary plane is visible, but has a NULL FB,
         * which will lead to problems later if we don't fix it up.  The
         * simplest solution is to just disable the primary plane now and
         * pretend the BIOS never had it enabled.
         */
        intel_plane_disable_noatomic(intel_crtc, intel_plane);

        return;

valid_fb:
        intel_state->base.rotation = plane_config->rotation;
        intel_fill_fb_ggtt_view(&intel_state->view, fb,
                                intel_state->base.rotation);
        intel_state->color_plane[0].stride =
                intel_fb_pitch(fb, 0, intel_state->base.rotation);

        mutex_lock(&dev->struct_mutex);
        intel_state->vma =
                intel_pin_and_fence_fb_obj(fb,
                                           &intel_state->view,
                                           intel_plane_uses_fence(intel_state),
                                           &intel_state->flags);
        mutex_unlock(&dev->struct_mutex);
        if (IS_ERR(intel_state->vma)) {
                DRM_ERROR("failed to pin boot fb on pipe %d: %li\n",
                          intel_crtc->pipe, PTR_ERR(intel_state->vma));

                intel_state->vma = NULL;
                drm_framebuffer_put(fb);
                return;
        }

        obj = intel_fb_obj(fb);
        intel_fb_obj_flush(obj, ORIGIN_DIRTYFB);

        plane_state->src_x = 0;
        plane_state->src_y = 0;
        plane_state->src_w = fb->width << 16;
        plane_state->src_h = fb->height << 16;

        plane_state->crtc_x = 0;
        plane_state->crtc_y = 0;
        plane_state->crtc_w = fb->width;
        plane_state->crtc_h = fb->height;

        intel_state->base.src = drm_plane_state_src(plane_state);
        intel_state->base.dst = drm_plane_state_dest(plane_state);

        if (i915_gem_object_is_tiled(obj))
                dev_priv->preserve_bios_swizzle = true;

        plane_state->fb = fb;
        plane_state->crtc = &intel_crtc->base;

        atomic_or(to_intel_plane(primary)->frontbuffer_bit,
                  &obj->frontbuffer_bits);
}

static int skl_max_plane_width(const struct drm_framebuffer *fb,
                               int color_plane,
                               unsigned int rotation)
{
        int cpp = fb->format->cpp[color_plane];

        switch (fb->modifier) {
        case DRM_FORMAT_MOD_LINEAR:
        case I915_FORMAT_MOD_X_TILED:
                switch (cpp) {
                case 8:
                        return 4096;
                case 4:
                case 2:
                case 1:
                        return 8192;
                default:
                        MISSING_CASE(cpp);
                        break;
                }
                break;
        case I915_FORMAT_MOD_Y_TILED_CCS:
        case I915_FORMAT_MOD_Yf_TILED_CCS:
                /* FIXME AUX plane? */
        case I915_FORMAT_MOD_Y_TILED:
        case I915_FORMAT_MOD_Yf_TILED:
                switch (cpp) {
                case 8:
                        return 2048;
                case 4:
                        return 4096;
                case 2:
                case 1:
                        return 8192;
                default:
                        MISSING_CASE(cpp);
                        break;
                }
                break;
        default:
                MISSING_CASE(fb->modifier);
        }

        return 2048;
}

static bool skl_check_main_ccs_coordinates(struct intel_plane_state *plane_state,
                                           int main_x, int main_y, u32 main_offset)
{
        const struct drm_framebuffer *fb = plane_state->base.fb;
        int hsub = fb->format->hsub;
        int vsub = fb->format->vsub;
        int aux_x = plane_state->color_plane[1].x;
        int aux_y = plane_state->color_plane[1].y;
        u32 aux_offset = plane_state->color_plane[1].offset;
        u32 alignment = intel_surf_alignment(fb, 1);

        while (aux_offset >= main_offset && aux_y <= main_y) {
                int x, y;

                if (aux_x == main_x && aux_y == main_y)
                        break;

                if (aux_offset == 0)
                        break;

                x = aux_x / hsub;
                y = aux_y / vsub;
                aux_offset = intel_plane_adjust_aligned_offset(&x, &y, plane_state, 1,
                                                               aux_offset, aux_offset - alignment);
                aux_x = x * hsub + aux_x % hsub;
                aux_y = y * vsub + aux_y % vsub;
        }

        if (aux_x != main_x || aux_y != main_y)
                return false;

        plane_state->color_plane[1].offset = aux_offset;
        plane_state->color_plane[1].x = aux_x;
        plane_state->color_plane[1].y = aux_y;

        return true;
}

static int skl_check_main_surface(struct intel_plane_state *plane_state)
{
        const struct drm_framebuffer *fb = plane_state->base.fb;
        unsigned int rotation = plane_state->base.rotation;
        int x = plane_state->base.src.x1 >> 16;
        int y = plane_state->base.src.y1 >> 16;
        int w = drm_rect_width(&plane_state->base.src) >> 16;
        int h = drm_rect_height(&plane_state->base.src) >> 16;
        int max_width = skl_max_plane_width(fb, 0, rotation);
        int max_height = 4096;
        u32 alignment, offset, aux_offset = plane_state->color_plane[1].offset;

        if (w > max_width || h > max_height) {
                DRM_DEBUG_KMS("requested Y/RGB source size %dx%d too big (limit %dx%d)\n",
                              w, h, max_width, max_height);
                return -EINVAL;
        }

        intel_add_fb_offsets(&x, &y, plane_state, 0);
        offset = intel_plane_compute_aligned_offset(&x, &y, plane_state, 0);
        alignment = intel_surf_alignment(fb, 0);

        /*
         * AUX surface offset is specified as the distance from the
         * main surface offset, and it must be non-negative. Make
         * sure that is what we will get.
         */
        if (offset > aux_offset)
                offset = intel_plane_adjust_aligned_offset(&x, &y, plane_state, 0,
                                                           offset, aux_offset & ~(alignment - 1));

        /*
         * When using an X-tiled surface, the plane blows up
         * if the x offset + width exceed the stride.
         *
         * TODO: linear and Y-tiled seem fine, Yf untested,
         */
        if (fb->modifier == I915_FORMAT_MOD_X_TILED) {
                int cpp = fb->format->cpp[0];

                while ((x + w) * cpp > plane_state->color_plane[0].stride) {
                        if (offset == 0) {
                                DRM_DEBUG_KMS("Unable to find suitable display surface offset due to X-tiling\n");
                                return -EINVAL;
                        }

                        offset = intel_plane_adjust_aligned_offset(&x, &y, plane_state, 0,
                                                                   offset, offset - alignment);
                }
        }

        /*
         * CCS AUX surface doesn't have its own x/y offsets, we must make sure
         * they match with the main surface x/y offsets.
         */
        if (is_ccs_modifier(fb->modifier)) {
                while (!skl_check_main_ccs_coordinates(plane_state, x, y, offset)) {
                        if (offset == 0)
                                break;

                        offset = intel_plane_adjust_aligned_offset(&x, &y, plane_state, 0,
                                                                   offset, offset - alignment);
                }

                if (x != plane_state->color_plane[1].x || y != plane_state->color_plane[1].y) {
                        DRM_DEBUG_KMS("Unable to find suitable display surface offset due to CCS\n");
                        return -EINVAL;
                }
        }

        plane_state->color_plane[0].offset = offset;
        plane_state->color_plane[0].x = x;
        plane_state->color_plane[0].y = y;

        return 0;
}

static int
skl_check_nv12_surface(struct intel_plane_state *plane_state)
{
        /* Display WA #1106 */
        if (plane_state->base.rotation !=
            (DRM_MODE_REFLECT_X | DRM_MODE_ROTATE_90) &&
            plane_state->base.rotation != DRM_MODE_ROTATE_270)
                return 0;

        /*
         * src coordinates are rotated here.
         * We check height but report it as width
         */
        if (((drm_rect_height(&plane_state->base.src) >> 16) % 4) != 0) {
                DRM_DEBUG_KMS("src width must be multiple "
                              "of 4 for rotated NV12\n");
                return -EINVAL;
        }

        return 0;
}

static int skl_check_nv12_aux_surface(struct intel_plane_state *plane_state)
{
        const struct drm_framebuffer *fb = plane_state->base.fb;
        unsigned int rotation = plane_state->base.rotation;
        int max_width = skl_max_plane_width(fb, 1, rotation);
        int max_height = 4096;
        int x = plane_state->base.src.x1 >> 17;
        int y = plane_state->base.src.y1 >> 17;
        int w = drm_rect_width(&plane_state->base.src) >> 17;
        int h = drm_rect_height(&plane_state->base.src) >> 17;
        u32 offset;

        intel_add_fb_offsets(&x, &y, plane_state, 1);
        offset = intel_plane_compute_aligned_offset(&x, &y, plane_state, 1);

        /* FIXME not quite sure how/if these apply to the chroma plane */
        if (w > max_width || h > max_height) {
                DRM_DEBUG_KMS("CbCr source size %dx%d too big (limit %dx%d)\n",
                              w, h, max_width, max_height);
                return -EINVAL;
        }

        plane_state->color_plane[1].offset = offset;
        plane_state->color_plane[1].x = x;
        plane_state->color_plane[1].y = y;

        return 0;
}

static int skl_check_ccs_aux_surface(struct intel_plane_state *plane_state)
{
        const struct drm_framebuffer *fb = plane_state->base.fb;
        int src_x = plane_state->base.src.x1 >> 16;
        int src_y = plane_state->base.src.y1 >> 16;
        int hsub = fb->format->hsub;
        int vsub = fb->format->vsub;
        int x = src_x / hsub;
        int y = src_y / vsub;
        u32 offset;

        intel_add_fb_offsets(&x, &y, plane_state, 1);
        offset = intel_plane_compute_aligned_offset(&x, &y, plane_state, 1);

        plane_state->color_plane[1].offset = offset;
        plane_state->color_plane[1].x = x * hsub + src_x % hsub;
        plane_state->color_plane[1].y = y * vsub + src_y % vsub;

        return 0;
}

int skl_check_plane_surface(struct intel_plane_state *plane_state)
{
        const struct drm_framebuffer *fb = plane_state->base.fb;
        unsigned int rotation = plane_state->base.rotation;
        int ret;

        intel_fill_fb_ggtt_view(&plane_state->view, fb, rotation);
        plane_state->color_plane[0].stride = intel_fb_pitch(fb, 0, rotation);
        plane_state->color_plane[1].stride = intel_fb_pitch(fb, 1, rotation);

        ret = intel_plane_check_stride(plane_state);
        if (ret)
                return ret;

        if (!plane_state->base.visible)
                return 0;

        /* Rotate src coordinates to match rotated GTT view */
        if (drm_rotation_90_or_270(rotation))
                drm_rect_rotate(&plane_state->base.src,
                                fb->width << 16, fb->height << 16,
                                DRM_MODE_ROTATE_270);

        /*
         * Handle the AUX surface first since
         * the main surface setup depends on it.
         */
        if (fb->format->format == DRM_FORMAT_NV12) {
                ret = skl_check_nv12_surface(plane_state);
                if (ret)
                        return ret;
                ret = skl_check_nv12_aux_surface(plane_state);
                if (ret)
                        return ret;
        } else if (is_ccs_modifier(fb->modifier)) {
                ret = skl_check_ccs_aux_surface(plane_state);
                if (ret)
                        return ret;
        } else {
                plane_state->color_plane[1].offset = ~0xfff;
                plane_state->color_plane[1].x = 0;
                plane_state->color_plane[1].y = 0;
        }

        ret = skl_check_main_surface(plane_state);
        if (ret)
                return ret;

        return 0;
}

unsigned int
i9xx_plane_max_stride(struct intel_plane *plane,
                      u32 pixel_format, u64 modifier,
                      unsigned int rotation)
{
        struct drm_i915_private *dev_priv = to_i915(plane->base.dev);

        if (!HAS_GMCH_DISPLAY(dev_priv)) {
                return 32*1024;
        } else if (INTEL_GEN(dev_priv) >= 4) {
                if (modifier == I915_FORMAT_MOD_X_TILED)
                        return 16*1024;
                else
                        return 32*1024;
        } else if (INTEL_GEN(dev_priv) >= 3) {
                if (modifier == I915_FORMAT_MOD_X_TILED)
                        return 8*1024;
                else
                        return 16*1024;
        } else {
                if (plane->i9xx_plane == PLANE_C)
                        return 4*1024;
                else
                        return 8*1024;
        }
}

static u32 i9xx_plane_ctl(const struct intel_crtc_state *crtc_state,
                          const struct intel_plane_state *plane_state)
{
        struct drm_i915_private *dev_priv =
                to_i915(plane_state->base.plane->dev);
        struct intel_crtc *crtc = to_intel_crtc(crtc_state->base.crtc);
        const struct drm_framebuffer *fb = plane_state->base.fb;
        unsigned int rotation = plane_state->base.rotation;
        u32 dspcntr;

        dspcntr = DISPLAY_PLANE_ENABLE | DISPPLANE_GAMMA_ENABLE;

        if (IS_G4X(dev_priv) || IS_GEN5(dev_priv) ||
            IS_GEN6(dev_priv) || IS_IVYBRIDGE(dev_priv))
                dspcntr |= DISPPLANE_TRICKLE_FEED_DISABLE;

        if (IS_HASWELL(dev_priv) || IS_BROADWELL(dev_priv))
                dspcntr |= DISPPLANE_PIPE_CSC_ENABLE;

        if (INTEL_GEN(dev_priv) < 5)
                dspcntr |= DISPPLANE_SEL_PIPE(crtc->pipe);

        switch (fb->format->format) {
        case DRM_FORMAT_C8:
                dspcntr |= DISPPLANE_8BPP;
                break;
        case DRM_FORMAT_XRGB1555:
                dspcntr |= DISPPLANE_BGRX555;
                break;
        case DRM_FORMAT_RGB565:
                dspcntr |= DISPPLANE_BGRX565;
                break;
        case DRM_FORMAT_XRGB8888:
                dspcntr |= DISPPLANE_BGRX888;
                break;
        case DRM_FORMAT_XBGR8888:
                dspcntr |= DISPPLANE_RGBX888;
                break;
        case DRM_FORMAT_XRGB2101010:
                dspcntr |= DISPPLANE_BGRX101010;
                break;
        case DRM_FORMAT_XBGR2101010:
                dspcntr |= DISPPLANE_RGBX101010;
                break;
        default:
                MISSING_CASE(fb->format->format);
                return 0;
        }

        if (INTEL_GEN(dev_priv) >= 4 &&
            fb->modifier == I915_FORMAT_MOD_X_TILED)
                dspcntr |= DISPPLANE_TILED;

        if (rotation & DRM_MODE_ROTATE_180)
                dspcntr |= DISPPLANE_ROTATE_180;

        if (rotation & DRM_MODE_REFLECT_X)
                dspcntr |= DISPPLANE_MIRROR;

        return dspcntr;
}

int i9xx_check_plane_surface(struct intel_plane_state *plane_state)
{
        struct drm_i915_private *dev_priv =
                to_i915(plane_state->base.plane->dev);
        const struct drm_framebuffer *fb = plane_state->base.fb;
        unsigned int rotation = plane_state->base.rotation;
        int src_x = plane_state->base.src.x1 >> 16;
        int src_y = plane_state->base.src.y1 >> 16;
        u32 offset;
        int ret;

        intel_fill_fb_ggtt_view(&plane_state->view, fb, rotation);
        plane_state->color_plane[0].stride = intel_fb_pitch(fb, 0, rotation);

        ret = intel_plane_check_stride(plane_state);
        if (ret)
                return ret;

        intel_add_fb_offsets(&src_x, &src_y, plane_state, 0);

        if (INTEL_GEN(dev_priv) >= 4)
                offset = intel_plane_compute_aligned_offset(&src_x, &src_y,
                                                            plane_state, 0);
        else
                offset = 0;

        /* HSW/BDW do this automagically in hardware */
        if (!IS_HASWELL(dev_priv) && !IS_BROADWELL(dev_priv)) {
                int src_w = drm_rect_width(&plane_state->base.src) >> 16;
                int src_h = drm_rect_height(&plane_state->base.src) >> 16;

                if (rotation & DRM_MODE_ROTATE_180) {
                        src_x += src_w - 1;
                        src_y += src_h - 1;
                } else if (rotation & DRM_MODE_REFLECT_X) {
                        src_x += src_w - 1;
                }
        }

        plane_state->color_plane[0].offset = offset;
        plane_state->color_plane[0].x = src_x;
        plane_state->color_plane[0].y = src_y;

        return 0;
}

static int
i9xx_plane_check(struct intel_crtc_state *crtc_state,
                 struct intel_plane_state *plane_state)
{
        int ret;

        ret = chv_plane_check_rotation(plane_state);
        if (ret)
                return ret;

        ret = drm_atomic_helper_check_plane_state(&plane_state->base,
                                                  &crtc_state->base,
                                                  DRM_PLANE_HELPER_NO_SCALING,
                                                  DRM_PLANE_HELPER_NO_SCALING,
                                                  false, true);
        if (ret)
                return ret;

        if (!plane_state->base.visible)
                return 0;

        ret = intel_plane_check_src_coordinates(plane_state);
        if (ret)
                return ret;

        ret = i9xx_check_plane_surface(plane_state);
        if (ret)
                return ret;

        plane_state->ctl = i9xx_plane_ctl(crtc_state, plane_state);

        return 0;
}

static void i9xx_update_plane(struct intel_plane *plane,
                              const struct intel_crtc_state *crtc_state,
                              const struct intel_plane_state *plane_state)
{
        struct drm_i915_private *dev_priv = to_i915(plane->base.dev);
        enum i9xx_plane_id i9xx_plane = plane->i9xx_plane;
        u32 linear_offset;
        u32 dspcntr = plane_state->ctl;
        i915_reg_t reg = DSPCNTR(i9xx_plane);
        int x = plane_state->color_plane[0].x;
        int y = plane_state->color_plane[0].y;
        unsigned long irqflags;
        u32 dspaddr_offset;

        linear_offset = intel_fb_xy_to_linear(x, y, plane_state, 0);

        if (INTEL_GEN(dev_priv) >= 4)
                dspaddr_offset = plane_state->color_plane[0].offset;
        else
                dspaddr_offset = linear_offset;

        spin_lock_irqsave(&dev_priv->uncore.lock, irqflags);

        if (INTEL_GEN(dev_priv) < 4) {
                /* pipesrc and dspsize control the size that is scaled from,
                 * which should always be the user's requested size.
                 */
                I915_WRITE_FW(DSPSIZE(i9xx_plane),
                              ((crtc_state->pipe_src_h - 1) << 16) |
                              (crtc_state->pipe_src_w - 1));
                I915_WRITE_FW(DSPPOS(i9xx_plane), 0);
        } else if (IS_CHERRYVIEW(dev_priv) && i9xx_plane == PLANE_B) {
                I915_WRITE_FW(PRIMSIZE(i9xx_plane),
                              ((crtc_state->pipe_src_h - 1) << 16) |
                              (crtc_state->pipe_src_w - 1));
                I915_WRITE_FW(PRIMPOS(i9xx_plane), 0);
                I915_WRITE_FW(PRIMCNSTALPHA(i9xx_plane), 0);
        }

        I915_WRITE_FW(reg, dspcntr);

        I915_WRITE_FW(DSPSTRIDE(i9xx_plane), plane_state->color_plane[0].stride);
        if (IS_HASWELL(dev_priv) || IS_BROADWELL(dev_priv)) {
                I915_WRITE_FW(DSPSURF(i9xx_plane),
                              intel_plane_ggtt_offset(plane_state) +
                              dspaddr_offset);
                I915_WRITE_FW(DSPOFFSET(i9xx_plane), (y << 16) | x);
        } else if (INTEL_GEN(dev_priv) >= 4) {
                I915_WRITE_FW(DSPSURF(i9xx_plane),
                              intel_plane_ggtt_offset(plane_state) +
                              dspaddr_offset);
                I915_WRITE_FW(DSPTILEOFF(i9xx_plane), (y << 16) | x);
                I915_WRITE_FW(DSPLINOFF(i9xx_plane), linear_offset);
        } else {
                I915_WRITE_FW(DSPADDR(i9xx_plane),
                              intel_plane_ggtt_offset(plane_state) +
                              dspaddr_offset);
        }
        POSTING_READ_FW(reg);

        spin_unlock_irqrestore(&dev_priv->uncore.lock, irqflags);
}

static void i9xx_disable_plane(struct intel_plane *plane,
                               struct intel_crtc *crtc)
{
        struct drm_i915_private *dev_priv = to_i915(plane->base.dev);
        enum i9xx_plane_id i9xx_plane = plane->i9xx_plane;
        unsigned long irqflags;

        spin_lock_irqsave(&dev_priv->uncore.lock, irqflags);

        I915_WRITE_FW(DSPCNTR(i9xx_plane), 0);
        if (INTEL_GEN(dev_priv) >= 4)
                I915_WRITE_FW(DSPSURF(i9xx_plane), 0);
        else
                I915_WRITE_FW(DSPADDR(i9xx_plane), 0);
        POSTING_READ_FW(DSPCNTR(i9xx_plane));

        spin_unlock_irqrestore(&dev_priv->uncore.lock, irqflags);
}

static bool i9xx_plane_get_hw_state(struct intel_plane *plane,
                                    enum i915_pipe *pipe)
{
        struct drm_i915_private *dev_priv = to_i915(plane->base.dev);
        enum intel_display_power_domain power_domain;
        enum i9xx_plane_id i9xx_plane = plane->i9xx_plane;
        bool ret;
        u32 val;

        /*
         * Not 100% correct for planes that can move between pipes,
         * but that's only the case for gen2-4 which don't have any
         * display power wells.
         */
        power_domain = POWER_DOMAIN_PIPE(plane->pipe);
        if (!intel_display_power_get_if_enabled(dev_priv, power_domain))
                return false;

        val = I915_READ(DSPCNTR(i9xx_plane));

        ret = val & DISPLAY_PLANE_ENABLE;

        if (INTEL_GEN(dev_priv) >= 5)
                *pipe = plane->pipe;
        else
                *pipe = (val & DISPPLANE_SEL_PIPE_MASK) >>
                        DISPPLANE_SEL_PIPE_SHIFT;

        intel_display_power_put(dev_priv, power_domain);

        return ret;
}

static u32
intel_fb_stride_alignment(const struct drm_framebuffer *fb, int color_plane)
{
        if (fb->modifier == DRM_FORMAT_MOD_LINEAR)
                return 64;
        else
                return intel_tile_width_bytes(fb, color_plane);
}

static void skl_detach_scaler(struct intel_crtc *intel_crtc, int id)
{
        struct drm_device *dev = intel_crtc->base.dev;
        struct drm_i915_private *dev_priv = to_i915(dev);

        I915_WRITE(SKL_PS_CTRL(intel_crtc->pipe, id), 0);
        I915_WRITE(SKL_PS_WIN_POS(intel_crtc->pipe, id), 0);
        I915_WRITE(SKL_PS_WIN_SZ(intel_crtc->pipe, id), 0);
}

/*
 * This function detaches (aka. unbinds) unused scalers in hardware
 */
static void skl_detach_scalers(struct intel_crtc *intel_crtc)
{
        struct intel_crtc_scaler_state *scaler_state;
        int i;

        scaler_state = &intel_crtc->config->scaler_state;

        /* loop through and disable scalers that aren't in use */
        for (i = 0; i < intel_crtc->num_scalers; i++) {
                if (!scaler_state->scalers[i].in_use)
                        skl_detach_scaler(intel_crtc, i);
        }
}

u32 skl_plane_stride(const struct intel_plane_state *plane_state,
                     int color_plane)
{
        const struct drm_framebuffer *fb = plane_state->base.fb;
        unsigned int rotation = plane_state->base.rotation;
        u32 stride = plane_state->color_plane[color_plane].stride;

        if (color_plane >= fb->format->num_planes)
                return 0;

        /*
         * The stride is either expressed as a multiple of 64 bytes chunks for
         * linear buffers or in number of tiles for tiled buffers.
         */
        if (drm_rotation_90_or_270(rotation))
                stride /= intel_tile_height(fb, color_plane);
        else
                stride /= intel_fb_stride_alignment(fb, color_plane);

        return stride;
}

static u32 skl_plane_ctl_format(uint32_t pixel_format)
{
        switch (pixel_format) {
        case DRM_FORMAT_C8:
                return PLANE_CTL_FORMAT_INDEXED;
        case DRM_FORMAT_RGB565:
                return PLANE_CTL_FORMAT_RGB_565;
        case DRM_FORMAT_XBGR8888:
        case DRM_FORMAT_ABGR8888:
                return PLANE_CTL_FORMAT_XRGB_8888 | PLANE_CTL_ORDER_RGBX;
        case DRM_FORMAT_XRGB8888:
        case DRM_FORMAT_ARGB8888:
                return PLANE_CTL_FORMAT_XRGB_8888;
        case DRM_FORMAT_XRGB2101010:
                return PLANE_CTL_FORMAT_XRGB_2101010;
        case DRM_FORMAT_XBGR2101010:
                return PLANE_CTL_ORDER_RGBX | PLANE_CTL_FORMAT_XRGB_2101010;
        case DRM_FORMAT_YUYV:
                return PLANE_CTL_FORMAT_YUV422 | PLANE_CTL_YUV422_YUYV;
        case DRM_FORMAT_YVYU:
                return PLANE_CTL_FORMAT_YUV422 | PLANE_CTL_YUV422_YVYU;
        case DRM_FORMAT_UYVY:
                return PLANE_CTL_FORMAT_YUV422 | PLANE_CTL_YUV422_UYVY;
        case DRM_FORMAT_VYUY:
                return PLANE_CTL_FORMAT_YUV422 | PLANE_CTL_YUV422_VYUY;
        case DRM_FORMAT_NV12:
                return PLANE_CTL_FORMAT_NV12;
        default:
                MISSING_CASE(pixel_format);
        }

        return 0;
}

/*
 * XXX: For ARBG/ABGR formats we default to expecting scanout buffers
 * to be already pre-multiplied. We need to add a knob (or a different
 * DRM_FORMAT) for user-space to configure that.
 */
static u32 skl_plane_ctl_alpha(uint32_t pixel_format)
{
        switch (pixel_format) {
        case DRM_FORMAT_ABGR8888:
        case DRM_FORMAT_ARGB8888:
                return PLANE_CTL_ALPHA_SW_PREMULTIPLY;
        default:
                return PLANE_CTL_ALPHA_DISABLE;
        }
}

static u32 glk_plane_color_ctl_alpha(uint32_t pixel_format)
{
        switch (pixel_format) {
        case DRM_FORMAT_ABGR8888:
        case DRM_FORMAT_ARGB8888:
                return PLANE_COLOR_ALPHA_SW_PREMULTIPLY;
        default:
                return PLANE_COLOR_ALPHA_DISABLE;
        }
}

static u32 skl_plane_ctl_tiling(uint64_t fb_modifier)
{
        switch (fb_modifier) {
        case DRM_FORMAT_MOD_LINEAR:
                break;
        case I915_FORMAT_MOD_X_TILED:
                return PLANE_CTL_TILED_X;
        case I915_FORMAT_MOD_Y_TILED:
                return PLANE_CTL_TILED_Y;
        case I915_FORMAT_MOD_Y_TILED_CCS:
                return PLANE_CTL_TILED_Y | PLANE_CTL_RENDER_DECOMPRESSION_ENABLE;
        case I915_FORMAT_MOD_Yf_TILED:
                return PLANE_CTL_TILED_YF;
        case I915_FORMAT_MOD_Yf_TILED_CCS:
                return PLANE_CTL_TILED_YF | PLANE_CTL_RENDER_DECOMPRESSION_ENABLE;
        default:
                MISSING_CASE(fb_modifier);
        }

        return 0;
}

static u32 skl_plane_ctl_rotate(unsigned int rotate)
{
        switch (rotate) {
        case DRM_MODE_ROTATE_0:
                break;
        /*
         * DRM_MODE_ROTATE_ is counter clockwise to stay compatible with Xrandr
         * while i915 HW rotation is clockwise, thats why this swapping.
         */
        case DRM_MODE_ROTATE_90:
                return PLANE_CTL_ROTATE_270;
        case DRM_MODE_ROTATE_180:
                return PLANE_CTL_ROTATE_180;
        case DRM_MODE_ROTATE_270:
                return PLANE_CTL_ROTATE_90;
        default:
                MISSING_CASE(rotate);
        }

        return 0;
}

static u32 cnl_plane_ctl_flip(unsigned int reflect)
{
        switch (reflect) {
        case 0:
                break;
        case DRM_MODE_REFLECT_X:
                return PLANE_CTL_FLIP_HORIZONTAL;
        case DRM_MODE_REFLECT_Y:
        default:
                MISSING_CASE(reflect);
        }

        return 0;
}

u32 skl_plane_ctl(const struct intel_crtc_state *crtc_state,
                  const struct intel_plane_state *plane_state)
{
        struct drm_i915_private *dev_priv =
                to_i915(plane_state->base.plane->dev);
        const struct drm_framebuffer *fb = plane_state->base.fb;
        unsigned int rotation = plane_state->base.rotation;
        const struct drm_intel_sprite_colorkey *key = &plane_state->ckey;
        u32 plane_ctl;

        plane_ctl = PLANE_CTL_ENABLE;

        if (INTEL_GEN(dev_priv) < 10 && !IS_GEMINILAKE(dev_priv)) {
                plane_ctl |= skl_plane_ctl_alpha(fb->format->format);
                plane_ctl |=
                        PLANE_CTL_PIPE_GAMMA_ENABLE |
                        PLANE_CTL_PIPE_CSC_ENABLE |
                        PLANE_CTL_PLANE_GAMMA_DISABLE;

                if (plane_state->base.color_encoding == DRM_COLOR_YCBCR_BT709)
                        plane_ctl |= PLANE_CTL_YUV_TO_RGB_CSC_FORMAT_BT709;

                if (plane_state->base.color_range == DRM_COLOR_YCBCR_FULL_RANGE)
                        plane_ctl |= PLANE_CTL_YUV_RANGE_CORRECTION_DISABLE;
        }

        plane_ctl |= skl_plane_ctl_format(fb->format->format);
        plane_ctl |= skl_plane_ctl_tiling(fb->modifier);
        plane_ctl |= skl_plane_ctl_rotate(rotation & DRM_MODE_ROTATE_MASK);

        if (INTEL_GEN(dev_priv) >= 10)
                plane_ctl |= cnl_plane_ctl_flip(rotation &
                                                DRM_MODE_REFLECT_MASK);

        if (key->flags & I915_SET_COLORKEY_DESTINATION)
                plane_ctl |= PLANE_CTL_KEY_ENABLE_DESTINATION;
        else if (key->flags & I915_SET_COLORKEY_SOURCE)
                plane_ctl |= PLANE_CTL_KEY_ENABLE_SOURCE;

        return plane_ctl;
}

u32 glk_plane_color_ctl(const struct intel_crtc_state *crtc_state,
                        const struct intel_plane_state *plane_state)
{
        struct drm_i915_private *dev_priv =
                to_i915(plane_state->base.plane->dev);
        const struct drm_framebuffer *fb = plane_state->base.fb;
        u32 plane_color_ctl = 0;

        if (INTEL_GEN(dev_priv) < 11) {
                plane_color_ctl |= PLANE_COLOR_PIPE_GAMMA_ENABLE;
                plane_color_ctl |= PLANE_COLOR_PIPE_CSC_ENABLE;
        }
        plane_color_ctl |= PLANE_COLOR_PLANE_GAMMA_DISABLE;
        plane_color_ctl |= glk_plane_color_ctl_alpha(fb->format->format);

        if (fb->format->is_yuv) {
                if (plane_state->base.color_encoding == DRM_COLOR_YCBCR_BT709)
                        plane_color_ctl |= PLANE_COLOR_CSC_MODE_YUV709_TO_RGB709;
                else
                        plane_color_ctl |= PLANE_COLOR_CSC_MODE_YUV601_TO_RGB709;

                if (plane_state->base.color_range == DRM_COLOR_YCBCR_FULL_RANGE)
                        plane_color_ctl |= PLANE_COLOR_YUV_RANGE_CORRECTION_DISABLE;
        }

        return plane_color_ctl;
}

static int
__intel_display_resume(struct drm_device *dev,
                       struct drm_atomic_state *state,
                       struct drm_modeset_acquire_ctx *ctx)
{
        struct drm_crtc_state *crtc_state;
        struct drm_crtc *crtc;
        int i, ret;

        intel_modeset_setup_hw_state(dev, ctx);
        i915_redisable_vga(to_i915(dev));

        if (!state)
                return 0;

        /*
         * We've duplicated the state, pointers to the old state are invalid.
         *
         * Don't attempt to use the old state until we commit the duplicated state.
         */
        for_each_new_crtc_in_state(state, crtc, crtc_state, i) {
                /*
                 * Force recalculation even if we restore
                 * current state. With fast modeset this may not result
                 * in a modeset when the state is compatible.
                 */
                crtc_state->mode_changed = true;
        }

        /* ignore any reset values/BIOS leftovers in the WM registers */
        if (!HAS_GMCH_DISPLAY(to_i915(dev)))
                to_intel_atomic_state(state)->skip_intermediate_wm = true;

        ret = drm_atomic_helper_commit_duplicated_state(state, ctx);

        WARN_ON(ret == -EDEADLK);
        return ret;
}

static bool gpu_reset_clobbers_display(struct drm_i915_private *dev_priv)
{
        return intel_has_gpu_reset(dev_priv) &&
                INTEL_GEN(dev_priv) < 5 && !IS_G4X(dev_priv);
}

void intel_prepare_reset(struct drm_i915_private *dev_priv)
{
        struct drm_device *dev = &dev_priv->drm;
        struct drm_modeset_acquire_ctx *ctx = &dev_priv->reset_ctx;
        struct drm_atomic_state *state;
        int ret;

        /* reset doesn't touch the display */
        if (!i915_modparams.force_reset_modeset_test &&
            !gpu_reset_clobbers_display(dev_priv))
                return;

        /* We have a modeset vs reset deadlock, defensively unbreak it. */
        set_bit(I915_RESET_MODESET, &dev_priv->gpu_error.flags);
        wake_up_all(&dev_priv->gpu_error.wait_queue);

        if (atomic_read(&dev_priv->gpu_error.pending_fb_pin)) {
                DRM_DEBUG_KMS("Modeset potentially stuck, unbreaking through wedging\n");
                i915_gem_set_wedged(dev_priv);
        }

        /*
         * Need mode_config.mutex so that we don't
         * trample ongoing ->detect() and whatnot.
         */
        mutex_lock(&dev->mode_config.mutex);
        drm_modeset_acquire_init(ctx, 0);
        while (1) {
                ret = drm_modeset_lock_all_ctx(dev, ctx);
                if (ret != -EDEADLK)
                        break;

                drm_modeset_backoff(ctx);
        }
        /*
         * Disabling the crtcs gracefully seems nicer. Also the
         * g33 docs say we should at least disable all the planes.
         */
        state = drm_atomic_helper_duplicate_state(dev, ctx);
        if (IS_ERR(state)) {
                ret = PTR_ERR(state);
                DRM_ERROR("Duplicating state failed with %i\n", ret);
                return;
        }

        ret = drm_atomic_helper_disable_all(dev, ctx);
        if (ret) {
                DRM_ERROR("Suspending crtc's failed with %i\n", ret);
                drm_atomic_state_put(state);
                return;
        }

        dev_priv->modeset_restore_state = state;
        state->acquire_ctx = ctx;
}

void intel_finish_reset(struct drm_i915_private *dev_priv)
{
        struct drm_device *dev = &dev_priv->drm;
        struct drm_modeset_acquire_ctx *ctx = &dev_priv->reset_ctx;
        struct drm_atomic_state *state;
        int ret;

        /* reset doesn't touch the display */
        if (!test_bit(I915_RESET_MODESET, &dev_priv->gpu_error.flags))
                return;

        state = fetch_and_zero(&dev_priv->modeset_restore_state);
        if (!state)
                goto unlock;

        /* reset doesn't touch the display */
        if (!gpu_reset_clobbers_display(dev_priv)) {
                /* for testing only restore the display */
                ret = __intel_display_resume(dev, state, ctx);
                if (ret)
                        DRM_ERROR("Restoring old state failed with %i\n", ret);
        } else {
                /*
                 * The display has been reset as well,
                 * so need a full re-initialization.
                 */
                intel_runtime_pm_disable_interrupts(dev_priv);
                intel_runtime_pm_enable_interrupts(dev_priv);

                intel_pps_unlock_regs_wa(dev_priv);
                intel_modeset_init_hw(dev);
                intel_init_clock_gating(dev_priv);

                spin_lock_irq(&dev_priv->irq_lock);
                if (dev_priv->display.hpd_irq_setup)
                        dev_priv->display.hpd_irq_setup(dev_priv);
                spin_unlock_irq(&dev_priv->irq_lock);

                ret = __intel_display_resume(dev, state, ctx);
                if (ret)
                        DRM_ERROR("Restoring old state failed with %i\n", ret);

                intel_hpd_init(dev_priv);
        }

        drm_atomic_state_put(state);
unlock:
        drm_modeset_drop_locks(ctx);
        drm_modeset_acquire_fini(ctx);
        mutex_unlock(&dev->mode_config.mutex);

        clear_bit(I915_RESET_MODESET, &dev_priv->gpu_error.flags);
}

static void intel_update_pipe_config(const struct intel_crtc_state *old_crtc_state,
                                     const struct intel_crtc_state *new_crtc_state)
{
        struct intel_crtc *crtc = to_intel_crtc(new_crtc_state->base.crtc);
        struct drm_i915_private *dev_priv = to_i915(crtc->base.dev);

        /* drm_atomic_helper_update_legacy_modeset_state might not be called. */
        crtc->base.mode = new_crtc_state->base.mode;

        /*
         * Update pipe size and adjust fitter if needed: the reason for this is
         * that in compute_mode_changes we check the native mode (not the pfit
         * mode) to see if we can flip rather than do a full mode set. In the
         * fastboot case, we'll flip, but if we don't update the pipesrc and
         * pfit state, we'll end up with a big fb scanned out into the wrong
         * sized surface.
         */

        I915_WRITE(PIPESRC(crtc->pipe),
                   ((new_crtc_state->pipe_src_w - 1) << 16) |
                   (new_crtc_state->pipe_src_h - 1));

        /* on skylake this is done by detaching scalers */
        if (INTEL_GEN(dev_priv) >= 9) {
                skl_detach_scalers(crtc);

                if (new_crtc_state->pch_pfit.enabled)
                        skylake_pfit_enable(crtc);
        } else if (HAS_PCH_SPLIT(dev_priv)) {
                if (new_crtc_state->pch_pfit.enabled)
                        ironlake_pfit_enable(crtc);
                else if (old_crtc_state->pch_pfit.enabled)
                        ironlake_pfit_disable(crtc, true);
        }
}

static void intel_fdi_normal_train(struct intel_crtc *crtc)
{
        struct drm_device *dev = crtc->base.dev;
        struct drm_i915_private *dev_priv = to_i915(dev);
        int pipe = crtc->pipe;
        i915_reg_t reg;
        u32 temp;

        /* enable normal train */
        reg = FDI_TX_CTL(pipe);
        temp = I915_READ(reg);
        if (IS_IVYBRIDGE(dev_priv)) {
                temp &= ~FDI_LINK_TRAIN_NONE_IVB;
                temp |= FDI_LINK_TRAIN_NONE_IVB | FDI_TX_ENHANCE_FRAME_ENABLE;
        } else {
                temp &= ~FDI_LINK_TRAIN_NONE;
                temp |= FDI_LINK_TRAIN_NONE | FDI_TX_ENHANCE_FRAME_ENABLE;
        }
        I915_WRITE(reg, temp);

        reg = FDI_RX_CTL(pipe);
        temp = I915_READ(reg);
        if (HAS_PCH_CPT(dev_priv)) {
                temp &= ~FDI_LINK_TRAIN_PATTERN_MASK_CPT;
                temp |= FDI_LINK_TRAIN_NORMAL_CPT;
        } else {
                temp &= ~FDI_LINK_TRAIN_NONE;
                temp |= FDI_LINK_TRAIN_NONE;
        }
        I915_WRITE(reg, temp | FDI_RX_ENHANCE_FRAME_ENABLE);

        /* wait one idle pattern time */
        POSTING_READ(reg);
        udelay(1000);

        /* IVB wants error correction enabled */
        if (IS_IVYBRIDGE(dev_priv))
                I915_WRITE(reg, I915_READ(reg) | FDI_FS_ERRC_ENABLE |
                           FDI_FE_ERRC_ENABLE);
}

/* The FDI link training functions for ILK/Ibexpeak. */
static void ironlake_fdi_link_train(struct intel_crtc *crtc,
                                    const struct intel_crtc_state *crtc_state)
{
        struct drm_device *dev = crtc->base.dev;
        struct drm_i915_private *dev_priv = to_i915(dev);
        int pipe = crtc->pipe;
        i915_reg_t reg;
        u32 temp, tries;

        /* FDI needs bits from pipe first */
        assert_pipe_enabled(dev_priv, pipe);

        /* Train 1: umask FDI RX Interrupt symbol_lock and bit_lock bit
           for train result */
        reg = FDI_RX_IMR(pipe);
        temp = I915_READ(reg);
        temp &= ~FDI_RX_SYMBOL_LOCK;
        temp &= ~FDI_RX_BIT_LOCK;
        I915_WRITE(reg, temp);
        I915_READ(reg);
        udelay(150);

        /* enable CPU FDI TX and PCH FDI RX */
        reg = FDI_TX_CTL(pipe);
        temp = I915_READ(reg);
        temp &= ~FDI_DP_PORT_WIDTH_MASK;
        temp |= FDI_DP_PORT_WIDTH(crtc_state->fdi_lanes);
        temp &= ~FDI_LINK_TRAIN_NONE;
        temp |= FDI_LINK_TRAIN_PATTERN_1;
        I915_WRITE(reg, temp | FDI_TX_ENABLE);

        reg = FDI_RX_CTL(pipe);
        temp = I915_READ(reg);
        temp &= ~FDI_LINK_TRAIN_NONE;
        temp |= FDI_LINK_TRAIN_PATTERN_1;
        I915_WRITE(reg, temp | FDI_RX_ENABLE);

        POSTING_READ(reg);
        udelay(150);

        /* Ironlake workaround, enable clock pointer after FDI enable*/
        I915_WRITE(FDI_RX_CHICKEN(pipe), FDI_RX_PHASE_SYNC_POINTER_OVR);
        I915_WRITE(FDI_RX_CHICKEN(pipe), FDI_RX_PHASE_SYNC_POINTER_OVR |
                   FDI_RX_PHASE_SYNC_POINTER_EN);

        reg = FDI_RX_IIR(pipe);
        for (tries = 0; tries < 5; tries++) {
                temp = I915_READ(reg);
                DRM_DEBUG_KMS("FDI_RX_IIR 0x%x\n", temp);

                if ((temp & FDI_RX_BIT_LOCK)) {
                        DRM_DEBUG_KMS("FDI train 1 done.\n");
                        I915_WRITE(reg, temp | FDI_RX_BIT_LOCK);
                        break;
                }
        }
        if (tries == 5)
                DRM_ERROR("FDI train 1 fail!\n");

        /* Train 2 */
        reg = FDI_TX_CTL(pipe);
        temp = I915_READ(reg);
        temp &= ~FDI_LINK_TRAIN_NONE;
        temp |= FDI_LINK_TRAIN_PATTERN_2;
        I915_WRITE(reg, temp);

        reg = FDI_RX_CTL(pipe);
        temp = I915_READ(reg);
        temp &= ~FDI_LINK_TRAIN_NONE;
        temp |= FDI_LINK_TRAIN_PATTERN_2;
        I915_WRITE(reg, temp);

        POSTING_READ(reg);
        udelay(150);

        reg = FDI_RX_IIR(pipe);
        for (tries = 0; tries < 5; tries++) {
                temp = I915_READ(reg);
                DRM_DEBUG_KMS("FDI_RX_IIR 0x%x\n", temp);

                if (temp & FDI_RX_SYMBOL_LOCK) {
                        I915_WRITE(reg, temp | FDI_RX_SYMBOL_LOCK);
                        DRM_DEBUG_KMS("FDI train 2 done.\n");
                        break;
                }
        }
        if (tries == 5)
                DRM_ERROR("FDI train 2 fail!\n");

        DRM_DEBUG_KMS("FDI train done\n");

}

static const int snb_b_fdi_train_param[] = {
        FDI_LINK_TRAIN_400MV_0DB_SNB_B,
        FDI_LINK_TRAIN_400MV_6DB_SNB_B,
        FDI_LINK_TRAIN_600MV_3_5DB_SNB_B,
        FDI_LINK_TRAIN_800MV_0DB_SNB_B,
};

/* The FDI link training functions for SNB/Cougarpoint. */
static void gen6_fdi_link_train(struct intel_crtc *crtc,
                                const struct intel_crtc_state *crtc_state)
{
        struct drm_device *dev = crtc->base.dev;
        struct drm_i915_private *dev_priv = to_i915(dev);
        int pipe = crtc->pipe;
        i915_reg_t reg;
        u32 temp, i, retry;

        /* Train 1: umask FDI RX Interrupt symbol_lock and bit_lock bit
           for train result */
        reg = FDI_RX_IMR(pipe);
        temp = I915_READ(reg);
        temp &= ~FDI_RX_SYMBOL_LOCK;
        temp &= ~FDI_RX_BIT_LOCK;
        I915_WRITE(reg, temp);

        POSTING_READ(reg);
        udelay(150);

        /* enable CPU FDI TX and PCH FDI RX */
        reg = FDI_TX_CTL(pipe);
        temp = I915_READ(reg);
        temp &= ~FDI_DP_PORT_WIDTH_MASK;
        temp |= FDI_DP_PORT_WIDTH(crtc_state->fdi_lanes);
        temp &= ~FDI_LINK_TRAIN_NONE;
        temp |= FDI_LINK_TRAIN_PATTERN_1;
        temp &= ~FDI_LINK_TRAIN_VOL_EMP_MASK;
        /* SNB-B */
        temp |= FDI_LINK_TRAIN_400MV_0DB_SNB_B;
        I915_WRITE(reg, temp | FDI_TX_ENABLE);

        I915_WRITE(FDI_RX_MISC(pipe),
                   FDI_RX_TP1_TO_TP2_48 | FDI_RX_FDI_DELAY_90);

        reg = FDI_RX_CTL(pipe);
        temp = I915_READ(reg);
        if (HAS_PCH_CPT(dev_priv)) {
                temp &= ~FDI_LINK_TRAIN_PATTERN_MASK_CPT;
                temp |= FDI_LINK_TRAIN_PATTERN_1_CPT;
        } else {
                temp &= ~FDI_LINK_TRAIN_NONE;
                temp |= FDI_LINK_TRAIN_PATTERN_1;
        }
        I915_WRITE(reg, temp | FDI_RX_ENABLE);

        POSTING_READ(reg);
        udelay(150);

        for (i = 0; i < 4; i++) {
                reg = FDI_TX_CTL(pipe);
                temp = I915_READ(reg);
                temp &= ~FDI_LINK_TRAIN_VOL_EMP_MASK;
                temp |= snb_b_fdi_train_param[i];
                I915_WRITE(reg, temp);

                POSTING_READ(reg);
                udelay(500);

                for (retry = 0; retry < 5; retry++) {
                        reg = FDI_RX_IIR(pipe);
                        temp = I915_READ(reg);
                        DRM_DEBUG_KMS("FDI_RX_IIR 0x%x\n", temp);
                        if (temp & FDI_RX_BIT_LOCK) {
                                I915_WRITE(reg, temp | FDI_RX_BIT_LOCK);
                                DRM_DEBUG_KMS("FDI train 1 done.\n");
                                break;
                        }
                        udelay(50);
                }
                if (retry < 5)
                        break;
        }
        if (i == 4)
                DRM_ERROR("FDI train 1 fail!\n");

        /* Train 2 */
        reg = FDI_TX_CTL(pipe);
        temp = I915_READ(reg);
        temp &= ~FDI_LINK_TRAIN_NONE;
        temp |= FDI_LINK_TRAIN_PATTERN_2;
        if (IS_GEN6(dev_priv)) {
                temp &= ~FDI_LINK_TRAIN_VOL_EMP_MASK;
                /* SNB-B */
                temp |= FDI_LINK_TRAIN_400MV_0DB_SNB_B;
        }
        I915_WRITE(reg, temp);

        reg = FDI_RX_CTL(pipe);
        temp = I915_READ(reg);
        if (HAS_PCH_CPT(dev_priv)) {
                temp &= ~FDI_LINK_TRAIN_PATTERN_MASK_CPT;
                temp |= FDI_LINK_TRAIN_PATTERN_2_CPT;
        } else {
                temp &= ~FDI_LINK_TRAIN_NONE;
                temp |= FDI_LINK_TRAIN_PATTERN_2;
        }
        I915_WRITE(reg, temp);

        POSTING_READ(reg);
        udelay(150);

        for (i = 0; i < 4; i++) {
                reg = FDI_TX_CTL(pipe);
                temp = I915_READ(reg);
                temp &= ~FDI_LINK_TRAIN_VOL_EMP_MASK;
                temp |= snb_b_fdi_train_param[i];
                I915_WRITE(reg, temp);

                POSTING_READ(reg);
                udelay(500);

                for (retry = 0; retry < 5; retry++) {
                        reg = FDI_RX_IIR(pipe);
                        temp = I915_READ(reg);
                        DRM_DEBUG_KMS("FDI_RX_IIR 0x%x\n", temp);
                        if (temp & FDI_RX_SYMBOL_LOCK) {
                                I915_WRITE(reg, temp | FDI_RX_SYMBOL_LOCK);
                                DRM_DEBUG_KMS("FDI train 2 done.\n");
                                break;
                        }
                        udelay(50);
                }
                if (retry < 5)
                        break;
        }
        if (i == 4)
                DRM_ERROR("FDI train 2 fail!\n");

        DRM_DEBUG_KMS("FDI train done.\n");
}

/* Manual link training for Ivy Bridge A0 parts */
static void ivb_manual_fdi_link_train(struct intel_crtc *crtc,
                                      const struct intel_crtc_state *crtc_state)
{
        struct drm_device *dev = crtc->base.dev;
        struct drm_i915_private *dev_priv = to_i915(dev);
        int pipe = crtc->pipe;
        i915_reg_t reg;
        u32 temp, i, j;

        /* Train 1: umask FDI RX Interrupt symbol_lock and bit_lock bit
           for train result */
        reg = FDI_RX_IMR(pipe);
        temp = I915_READ(reg);
        temp &= ~FDI_RX_SYMBOL_LOCK;
        temp &= ~FDI_RX_BIT_LOCK;
        I915_WRITE(reg, temp);

        POSTING_READ(reg);
        udelay(150);

        DRM_DEBUG_KMS("FDI_RX_IIR before link train 0x%x\n",
                      I915_READ(FDI_RX_IIR(pipe)));

        /* Try each vswing and preemphasis setting twice before moving on */
        for (j = 0; j < ARRAY_SIZE(snb_b_fdi_train_param) * 2; j++) {
                /* disable first in case we need to retry */
                reg = FDI_TX_CTL(pipe);
                temp = I915_READ(reg);
                temp &= ~(FDI_LINK_TRAIN_AUTO | FDI_LINK_TRAIN_NONE_IVB);
                temp &= ~FDI_TX_ENABLE;
                I915_WRITE(reg, temp);

                reg = FDI_RX_CTL(pipe);
                temp = I915_READ(reg);
                temp &= ~FDI_LINK_TRAIN_AUTO;
                temp &= ~FDI_LINK_TRAIN_PATTERN_MASK_CPT;
                temp &= ~FDI_RX_ENABLE;
                I915_WRITE(reg, temp);

                /* enable CPU FDI TX and PCH FDI RX */
                reg = FDI_TX_CTL(pipe);
                temp = I915_READ(reg);
                temp &= ~FDI_DP_PORT_WIDTH_MASK;
                temp |= FDI_DP_PORT_WIDTH(crtc_state->fdi_lanes);
                temp |= FDI_LINK_TRAIN_PATTERN_1_IVB;
                temp &= ~FDI_LINK_TRAIN_VOL_EMP_MASK;
                temp |= snb_b_fdi_train_param[j/2];
                temp |= FDI_COMPOSITE_SYNC;
                I915_WRITE(reg, temp | FDI_TX_ENABLE);

                I915_WRITE(FDI_RX_MISC(pipe),
                           FDI_RX_TP1_TO_TP2_48 | FDI_RX_FDI_DELAY_90);

                reg = FDI_RX_CTL(pipe);
                temp = I915_READ(reg);
                temp |= FDI_LINK_TRAIN_PATTERN_1_CPT;
                temp |= FDI_COMPOSITE_SYNC;
                I915_WRITE(reg, temp | FDI_RX_ENABLE);

                POSTING_READ(reg);
                udelay(1); /* should be 0.5us */

                for (i = 0; i < 4; i++) {
                        reg = FDI_RX_IIR(pipe);
                        temp = I915_READ(reg);
                        DRM_DEBUG_KMS("FDI_RX_IIR 0x%x\n", temp);

                        if (temp & FDI_RX_BIT_LOCK ||
                            (I915_READ(reg) & FDI_RX_BIT_LOCK)) {
                                I915_WRITE(reg, temp | FDI_RX_BIT_LOCK);
                                DRM_DEBUG_KMS("FDI train 1 done, level %i.\n",
                                              i);
                                break;
                        }
                        udelay(1); /* should be 0.5us */
                }
                if (i == 4) {
                        DRM_DEBUG_KMS("FDI train 1 fail on vswing %d\n", j / 2);
                        continue;
                }

                /* Train 2 */
                reg = FDI_TX_CTL(pipe);
                temp = I915_READ(reg);
                temp &= ~FDI_LINK_TRAIN_NONE_IVB;
                temp |= FDI_LINK_TRAIN_PATTERN_2_IVB;
                I915_WRITE(reg, temp);

                reg = FDI_RX_CTL(pipe);
                temp = I915_READ(reg);
                temp &= ~FDI_LINK_TRAIN_PATTERN_MASK_CPT;
                temp |= FDI_LINK_TRAIN_PATTERN_2_CPT;
                I915_WRITE(reg, temp);

                POSTING_READ(reg);
                udelay(2); /* should be 1.5us */

                for (i = 0; i < 4; i++) {
                        reg = FDI_RX_IIR(pipe);
                        temp = I915_READ(reg);
                        DRM_DEBUG_KMS("FDI_RX_IIR 0x%x\n", temp);

                        if (temp & FDI_RX_SYMBOL_LOCK ||
                            (I915_READ(reg) & FDI_RX_SYMBOL_LOCK)) {
                                I915_WRITE(reg, temp | FDI_RX_SYMBOL_LOCK);
                                DRM_DEBUG_KMS("FDI train 2 done, level %i.\n",
                                              i);
                                goto train_done;
                        }
                        udelay(2); /* should be 1.5us */
                }
                if (i == 4)
                        DRM_DEBUG_KMS("FDI train 2 fail on vswing %d\n", j / 2);
        }

train_done:
        DRM_DEBUG_KMS("FDI train done.\n");
}

static void ironlake_fdi_pll_enable(struct intel_crtc *intel_crtc)
{
        struct drm_device *dev = intel_crtc->base.dev;
        struct drm_i915_private *dev_priv = to_i915(dev);
        int pipe = intel_crtc->pipe;
        i915_reg_t reg;
        u32 temp;

        /* enable PCH FDI RX PLL, wait warmup plus DMI latency */
        reg = FDI_RX_CTL(pipe);
        temp = I915_READ(reg);
        temp &= ~(FDI_DP_PORT_WIDTH_MASK | (0x7 << 16));
        temp |= FDI_DP_PORT_WIDTH(intel_crtc->config->fdi_lanes);
        temp |= (I915_READ(PIPECONF(pipe)) & PIPECONF_BPC_MASK) << 11;
        I915_WRITE(reg, temp | FDI_RX_PLL_ENABLE);

        POSTING_READ(reg);
        udelay(200);

        /* Switch from Rawclk to PCDclk */
        temp = I915_READ(reg);
        I915_WRITE(reg, temp | FDI_PCDCLK);

        POSTING_READ(reg);
        udelay(200);

        /* Enable CPU FDI TX PLL, always on for Ironlake */
        reg = FDI_TX_CTL(pipe);
        temp = I915_READ(reg);
        if ((temp & FDI_TX_PLL_ENABLE) == 0) {
                I915_WRITE(reg, temp | FDI_TX_PLL_ENABLE);

                POSTING_READ(reg);
                udelay(100);
        }
}

static void ironlake_fdi_pll_disable(struct intel_crtc *intel_crtc)
{
        struct drm_device *dev = intel_crtc->base.dev;
        struct drm_i915_private *dev_priv = to_i915(dev);
        int pipe = intel_crtc->pipe;
        i915_reg_t reg;
        u32 temp;

        /* Switch from PCDclk to Rawclk */
        reg = FDI_RX_CTL(pipe);
        temp = I915_READ(reg);
        I915_WRITE(reg, temp & ~FDI_PCDCLK);

        /* Disable CPU FDI TX PLL */
        reg = FDI_TX_CTL(pipe);
        temp = I915_READ(reg);
        I915_WRITE(reg, temp & ~FDI_TX_PLL_ENABLE);

        POSTING_READ(reg);
        udelay(100);

        reg = FDI_RX_CTL(pipe);
        temp = I915_READ(reg);
        I915_WRITE(reg, temp & ~FDI_RX_PLL_ENABLE);

        /* Wait for the clocks to turn off. */
        POSTING_READ(reg);
        udelay(100);
}

static void ironlake_fdi_disable(struct drm_crtc *crtc)
{
        struct drm_device *dev = crtc->dev;
        struct drm_i915_private *dev_priv = to_i915(dev);
        struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
        int pipe = intel_crtc->pipe;
        i915_reg_t reg;
        u32 temp;

        /* disable CPU FDI tx and PCH FDI rx */
        reg = FDI_TX_CTL(pipe);
        temp = I915_READ(reg);
        I915_WRITE(reg, temp & ~FDI_TX_ENABLE);
        POSTING_READ(reg);

        reg = FDI_RX_CTL(pipe);
        temp = I915_READ(reg);
        temp &= ~(0x7 << 16);
        temp |= (I915_READ(PIPECONF(pipe)) & PIPECONF_BPC_MASK) << 11;
        I915_WRITE(reg, temp & ~FDI_RX_ENABLE);

        POSTING_READ(reg);
        udelay(100);

        /* Ironlake workaround, disable clock pointer after downing FDI */
        if (HAS_PCH_IBX(dev_priv))
                I915_WRITE(FDI_RX_CHICKEN(pipe), FDI_RX_PHASE_SYNC_POINTER_OVR);

        /* still set train pattern 1 */
        reg = FDI_TX_CTL(pipe);
        temp = I915_READ(reg);
        temp &= ~FDI_LINK_TRAIN_NONE;
        temp |= FDI_LINK_TRAIN_PATTERN_1;
        I915_WRITE(reg, temp);

        reg = FDI_RX_CTL(pipe);
        temp = I915_READ(reg);
        if (HAS_PCH_CPT(dev_priv)) {
                temp &= ~FDI_LINK_TRAIN_PATTERN_MASK_CPT;
                temp |= FDI_LINK_TRAIN_PATTERN_1_CPT;
        } else {
                temp &= ~FDI_LINK_TRAIN_NONE;
                temp |= FDI_LINK_TRAIN_PATTERN_1;
        }
        /* BPC in FDI rx is consistent with that in PIPECONF */
        temp &= ~(0x07 << 16);
        temp |= (I915_READ(PIPECONF(pipe)) & PIPECONF_BPC_MASK) << 11;
        I915_WRITE(reg, temp);

        POSTING_READ(reg);
        udelay(100);
}

bool intel_has_pending_fb_unpin(struct drm_i915_private *dev_priv)
{
        struct drm_crtc *crtc;
        bool cleanup_done;

        drm_for_each_crtc(crtc, &dev_priv->drm) {
                struct drm_crtc_commit *commit;
                lockmgr(&crtc->commit_lock, LK_EXCLUSIVE);
                commit = list_first_entry_or_null(&crtc->commit_list,
                                                  struct drm_crtc_commit, commit_entry);
                cleanup_done = commit ?
                        try_wait_for_completion(&commit->cleanup_done) : true;
                lockmgr(&crtc->commit_lock, LK_RELEASE);

                if (cleanup_done)
                        continue;

                drm_crtc_wait_one_vblank(crtc);

                return true;
        }

        return false;
}

void lpt_disable_iclkip(struct drm_i915_private *dev_priv)
{
        u32 temp;

        I915_WRITE(PIXCLK_GATE, PIXCLK_GATE_GATE);

        mutex_lock(&dev_priv->sb_lock);

        temp = intel_sbi_read(dev_priv, SBI_SSCCTL6, SBI_ICLK);
        temp |= SBI_SSCCTL_DISABLE;
        intel_sbi_write(dev_priv, SBI_SSCCTL6, temp, SBI_ICLK);

        mutex_unlock(&dev_priv->sb_lock);
}

/* Program iCLKIP clock to the desired frequency */
static void lpt_program_iclkip(struct intel_crtc *crtc)
{
        struct drm_i915_private *dev_priv = to_i915(crtc->base.dev);
        int clock = crtc->config->base.adjusted_mode.crtc_clock;
        u32 divsel, phaseinc, auxdiv, phasedir = 0;
        u32 temp;

        lpt_disable_iclkip(dev_priv);

        /* The iCLK virtual clock root frequency is in MHz,
         * but the adjusted_mode->crtc_clock in in KHz. To get the
         * divisors, it is necessary to divide one by another, so we
         * convert the virtual clock precision to KHz here for higher
         * precision.
         */
        for (auxdiv = 0; auxdiv < 2; auxdiv++) {
                u32 iclk_virtual_root_freq = 172800 * 1000;
                u32 iclk_pi_range = 64;
                u32 desired_divisor;

                desired_divisor = DIV_ROUND_CLOSEST(iclk_virtual_root_freq,
                                                    clock << auxdiv);
                divsel = (desired_divisor / iclk_pi_range) - 2;
                phaseinc = desired_divisor % iclk_pi_range;

                /*
                 * Near 20MHz is a corner case which is
                 * out of range for the 7-bit divisor
                 */
                if (divsel <= 0x7f)
                        break;
        }

        /* This should not happen with any sane values */
        WARN_ON(SBI_SSCDIVINTPHASE_DIVSEL(divsel) &
                ~SBI_SSCDIVINTPHASE_DIVSEL_MASK);
        WARN_ON(SBI_SSCDIVINTPHASE_DIR(phasedir) &
                ~SBI_SSCDIVINTPHASE_INCVAL_MASK);

        DRM_DEBUG_KMS("iCLKIP clock: found settings for %dKHz refresh rate: auxdiv=%x, divsel=%x, phasedir=%x, phaseinc=%x\n",
                        clock,
                        auxdiv,
                        divsel,
                        phasedir,
                        phaseinc);

        mutex_lock(&dev_priv->sb_lock);

        /* Program SSCDIVINTPHASE6 */
        temp = intel_sbi_read(dev_priv, SBI_SSCDIVINTPHASE6, SBI_ICLK);
        temp &= ~SBI_SSCDIVINTPHASE_DIVSEL_MASK;
        temp |= SBI_SSCDIVINTPHASE_DIVSEL(divsel);
        temp &= ~SBI_SSCDIVINTPHASE_INCVAL_MASK;
        temp |= SBI_SSCDIVINTPHASE_INCVAL(phaseinc);
        temp |= SBI_SSCDIVINTPHASE_DIR(phasedir);
        temp |= SBI_SSCDIVINTPHASE_PROPAGATE;
        intel_sbi_write(dev_priv, SBI_SSCDIVINTPHASE6, temp, SBI_ICLK);

        /* Program SSCAUXDIV */
        temp = intel_sbi_read(dev_priv, SBI_SSCAUXDIV6, SBI_ICLK);
        temp &= ~SBI_SSCAUXDIV_FINALDIV2SEL(1);
        temp |= SBI_SSCAUXDIV_FINALDIV2SEL(auxdiv);
        intel_sbi_write(dev_priv, SBI_SSCAUXDIV6, temp, SBI_ICLK);

        /* Enable modulator and associated divider */
        temp = intel_sbi_read(dev_priv, SBI_SSCCTL6, SBI_ICLK);
        temp &= ~SBI_SSCCTL_DISABLE;
        intel_sbi_write(dev_priv, SBI_SSCCTL6, temp, SBI_ICLK);

        mutex_unlock(&dev_priv->sb_lock);

        /* Wait for initialization time */
        udelay(24);

        I915_WRITE(PIXCLK_GATE, PIXCLK_GATE_UNGATE);
}

int lpt_get_iclkip(struct drm_i915_private *dev_priv)
{
        u32 divsel, phaseinc, auxdiv;
        u32 iclk_virtual_root_freq = 172800 * 1000;
        u32 iclk_pi_range = 64;
        u32 desired_divisor;
        u32 temp;

        if ((I915_READ(PIXCLK_GATE) & PIXCLK_GATE_UNGATE) == 0)
                return 0;

        mutex_lock(&dev_priv->sb_lock);

        temp = intel_sbi_read(dev_priv, SBI_SSCCTL6, SBI_ICLK);
        if (temp & SBI_SSCCTL_DISABLE) {
                mutex_unlock(&dev_priv->sb_lock);
                return 0;
        }

        temp = intel_sbi_read(dev_priv, SBI_SSCDIVINTPHASE6, SBI_ICLK);
        divsel = (temp & SBI_SSCDIVINTPHASE_DIVSEL_MASK) >>
                SBI_SSCDIVINTPHASE_DIVSEL_SHIFT;
        phaseinc = (temp & SBI_SSCDIVINTPHASE_INCVAL_MASK) >>
                SBI_SSCDIVINTPHASE_INCVAL_SHIFT;

        temp = intel_sbi_read(dev_priv, SBI_SSCAUXDIV6, SBI_ICLK);
        auxdiv = (temp & SBI_SSCAUXDIV_FINALDIV2SEL_MASK) >>
                SBI_SSCAUXDIV_FINALDIV2SEL_SHIFT;

        mutex_unlock(&dev_priv->sb_lock);

        desired_divisor = (divsel + 2) * iclk_pi_range + phaseinc;

        return DIV_ROUND_CLOSEST(iclk_virtual_root_freq,
                                 desired_divisor << auxdiv);
}

static void ironlake_pch_transcoder_set_timings(struct intel_crtc *crtc,
                                                enum i915_pipe pch_transcoder)
{
        struct drm_device *dev = crtc->base.dev;
        struct drm_i915_private *dev_priv = to_i915(dev);
        enum transcoder cpu_transcoder = crtc->config->cpu_transcoder;

        I915_WRITE(PCH_TRANS_HTOTAL(pch_transcoder),
                   I915_READ(HTOTAL(cpu_transcoder)));
        I915_WRITE(PCH_TRANS_HBLANK(pch_transcoder),
                   I915_READ(HBLANK(cpu_transcoder)));
        I915_WRITE(PCH_TRANS_HSYNC(pch_transcoder),
                   I915_READ(HSYNC(cpu_transcoder)));

        I915_WRITE(PCH_TRANS_VTOTAL(pch_transcoder),
                   I915_READ(VTOTAL(cpu_transcoder)));
        I915_WRITE(PCH_TRANS_VBLANK(pch_transcoder),
                   I915_READ(VBLANK(cpu_transcoder)));
        I915_WRITE(PCH_TRANS_VSYNC(pch_transcoder),
                   I915_READ(VSYNC(cpu_transcoder)));
        I915_WRITE(PCH_TRANS_VSYNCSHIFT(pch_transcoder),
                   I915_READ(VSYNCSHIFT(cpu_transcoder)));
}

static void cpt_set_fdi_bc_bifurcation(struct drm_device *dev, bool enable)
{
        struct drm_i915_private *dev_priv = to_i915(dev);
        uint32_t temp;

        temp = I915_READ(SOUTH_CHICKEN1);
        if (!!(temp & FDI_BC_BIFURCATION_SELECT) == enable)
                return;

        WARN_ON(I915_READ(FDI_RX_CTL(PIPE_B)) & FDI_RX_ENABLE);
        WARN_ON(I915_READ(FDI_RX_CTL(PIPE_C)) & FDI_RX_ENABLE);

        temp &= ~FDI_BC_BIFURCATION_SELECT;
        if (enable)
                temp |= FDI_BC_BIFURCATION_SELECT;

        DRM_DEBUG_KMS("%sabling fdi C rx\n", enable ? "en" : "dis");
        I915_WRITE(SOUTH_CHICKEN1, temp);
        POSTING_READ(SOUTH_CHICKEN1);
}

static void ivybridge_update_fdi_bc_bifurcation(struct intel_crtc *intel_crtc)
{
        struct drm_device *dev = intel_crtc->base.dev;

        switch (intel_crtc->pipe) {
        case PIPE_A:
                break;
        case PIPE_B:
                if (intel_crtc->config->fdi_lanes > 2)
                        cpt_set_fdi_bc_bifurcation(dev, false);
                else
                        cpt_set_fdi_bc_bifurcation(dev, true);

                break;
        case PIPE_C:
                cpt_set_fdi_bc_bifurcation(dev, true);

                break;
        default:
                BUG();
        }
}

/*
 * Finds the encoder associated with the given CRTC. This can only be
 * used when we know that the CRTC isn't feeding multiple encoders!
 */
static struct intel_encoder *
intel_get_crtc_new_encoder(const struct intel_atomic_state *state,
                           const struct intel_crtc_state *crtc_state)
{
        struct intel_crtc *crtc = to_intel_crtc(crtc_state->base.crtc);
        const struct drm_connector_state *connector_state;
        const struct drm_connector *connector;
        struct intel_encoder *encoder = NULL;
        int num_encoders = 0;
        int i;

        for_each_new_connector_in_state(&state->base, connector, connector_state, i) {
                if (connector_state->crtc != &crtc->base)
                        continue;

                encoder = to_intel_encoder(connector_state->best_encoder);
                num_encoders++;
        }

        WARN(num_encoders != 1, "%d encoders for pipe %c\n",
             num_encoders, pipe_name(crtc->pipe));

        return encoder;
}

/*
 * Enable PCH resources required for PCH ports:
 *   - PCH PLLs
 *   - FDI training & RX/TX
 *   - update transcoder timings
 *   - DP transcoding bits
 *   - transcoder
 */
static void ironlake_pch_enable(const struct intel_atomic_state *state,
                                const struct intel_crtc_state *crtc_state)
{
        struct intel_crtc *crtc = to_intel_crtc(crtc_state->base.crtc);
        struct drm_device *dev = crtc->base.dev;
        struct drm_i915_private *dev_priv = to_i915(dev);
        int pipe = crtc->pipe;
        u32 temp;

        assert_pch_transcoder_disabled(dev_priv, pipe);

        if (IS_IVYBRIDGE(dev_priv))
                ivybridge_update_fdi_bc_bifurcation(crtc);

        /* Write the TU size bits before fdi link training, so that error
         * detection works. */
        I915_WRITE(FDI_RX_TUSIZE1(pipe),
                   I915_READ(PIPE_DATA_M1(pipe)) & TU_SIZE_MASK);

        /* For PCH output, training FDI link */
        dev_priv->display.fdi_link_train(crtc, crtc_state);

        /* We need to program the right clock selection before writing the pixel
         * mutliplier into the DPLL. */
        if (HAS_PCH_CPT(dev_priv)) {
                u32 sel;

                temp = I915_READ(PCH_DPLL_SEL);
                temp |= TRANS_DPLL_ENABLE(pipe);
                sel = TRANS_DPLLB_SEL(pipe);
                if (crtc_state->shared_dpll ==
                    intel_get_shared_dpll_by_id(dev_priv, DPLL_ID_PCH_PLL_B))
                        temp |= sel;
                else
                        temp &= ~sel;
                I915_WRITE(PCH_DPLL_SEL, temp);
        }

        /* XXX: pch pll's can be enabled any time before we enable the PCH
         * transcoder, and we actually should do this to not upset any PCH
         * transcoder that already use the clock when we share it.
         *
         * Note that enable_shared_dpll tries to do the right thing, but
         * get_shared_dpll unconditionally resets the pll - we need that to have
         * the right LVDS enable sequence. */
        intel_enable_shared_dpll(crtc);

        /* set transcoder timing, panel must allow it */
        assert_panel_unlocked(dev_priv, pipe);
        ironlake_pch_transcoder_set_timings(crtc, pipe);

        intel_fdi_normal_train(crtc);

        /* For PCH DP, enable TRANS_DP_CTL */
        if (HAS_PCH_CPT(dev_priv) &&
            intel_crtc_has_dp_encoder(crtc_state)) {
                const struct drm_display_mode *adjusted_mode =
                        &crtc_state->base.adjusted_mode;
                u32 bpc = (I915_READ(PIPECONF(pipe)) & PIPECONF_BPC_MASK) >> 5;
                i915_reg_t reg = TRANS_DP_CTL(pipe);
                enum port port;

                temp = I915_READ(reg);
                temp &= ~(TRANS_DP_PORT_SEL_MASK |
                          TRANS_DP_SYNC_MASK |
                          TRANS_DP_BPC_MASK);
                temp |= TRANS_DP_OUTPUT_ENABLE;
                temp |= bpc << 9; /* same format but at 11:9 */

                if (adjusted_mode->flags & DRM_MODE_FLAG_PHSYNC)
                        temp |= TRANS_DP_HSYNC_ACTIVE_HIGH;
                if (adjusted_mode->flags & DRM_MODE_FLAG_PVSYNC)
                        temp |= TRANS_DP_VSYNC_ACTIVE_HIGH;

                port = intel_get_crtc_new_encoder(state, crtc_state)->port;
                WARN_ON(port < PORT_B || port > PORT_D);
                temp |= TRANS_DP_PORT_SEL(port);

                I915_WRITE(reg, temp);
        }

        ironlake_enable_pch_transcoder(dev_priv, pipe);
}

static void lpt_pch_enable(const struct intel_atomic_state *state,
                           const struct intel_crtc_state *crtc_state)
{
        struct intel_crtc *crtc = to_intel_crtc(crtc_state->base.crtc);
        struct drm_i915_private *dev_priv = to_i915(crtc->base.dev);
        enum transcoder cpu_transcoder = crtc_state->cpu_transcoder;

        assert_pch_transcoder_disabled(dev_priv, PIPE_A);

        lpt_program_iclkip(crtc);

        /* Set transcoder timing. */
        ironlake_pch_transcoder_set_timings(crtc, PIPE_A);

        lpt_enable_pch_transcoder(dev_priv, cpu_transcoder);
}

static void cpt_verify_modeset(struct drm_device *dev, int pipe)
{
        struct drm_i915_private *dev_priv = to_i915(dev);
        i915_reg_t dslreg = PIPEDSL(pipe);
        u32 temp;

        temp = I915_READ(dslreg);
        udelay(500);
        if (wait_for(I915_READ(dslreg) != temp, 5)) {
                if (wait_for(I915_READ(dslreg) != temp, 5))
                        DRM_ERROR("mode set failed: pipe %c stuck\n", pipe_name(pipe));
        }
}

/*
 * The hardware phase 0.0 refers to the center of the pixel.
 * We want to start from the top/left edge which is phase
 * -0.5. That matches how the hardware calculates the scaling
 * factors (from top-left of the first pixel to bottom-right
 * of the last pixel, as opposed to the pixel centers).
 *
 * For 4:2:0 subsampled chroma planes we obviously have to
 * adjust that so that the chroma sample position lands in
 * the right spot.
 *
 * Note that for packed YCbCr 4:2:2 formats there is no way to
 * control chroma siting. The hardware simply replicates the
 * chroma samples for both of the luma samples, and thus we don't
 * actually get the expected MPEG2 chroma siting convention :(
 * The same behaviour is observed on pre-SKL platforms as well.
 *
 * Theory behind the formula (note that we ignore sub-pixel
 * source coordinates):
 * s = source sample position
 * d = destination sample position
 *
 * Downscaling 4:1:
 * -0.5
 * | 0.0
 * | |     1.5 (initial phase)
 * | |     |
 * v v     v
 * | s | s | s | s |
 * |       d       |
 *
 * Upscaling 1:4:
 * -0.5
 * | -0.375 (initial phase)
 * | |     0.0
 * | |     |
 * v v     v
 * |       s       |
 * | d | d | d | d |
 */
u16 skl_scaler_calc_phase(int sub, int scale, bool chroma_cosited)
{
        int phase = -0x8000;
        u16 trip = 0;

        if (chroma_cosited)
                phase += (sub - 1) * 0x8000 / sub;

        phase += scale / (2 * sub);

        /*
         * Hardware initial phase limited to [-0.5:1.5].
         * Since the max hardware scale factor is 3.0, we
         * should never actually excdeed 1.0 here.
         */
        WARN_ON(phase < -0x8000 || phase > 0x18000);

        if (phase < 0)
                phase = 0x10000 + phase;
        else
                trip = PS_PHASE_TRIP;

        return ((phase >> 2) & PS_PHASE_MASK) | trip;
}

static int
skl_update_scaler(struct intel_crtc_state *crtc_state, bool force_detach,
                  unsigned int scaler_user, int *scaler_id,
                  int src_w, int src_h, int dst_w, int dst_h,
                  bool plane_scaler_check,
                  uint32_t pixel_format)
{
        struct intel_crtc_scaler_state *scaler_state =
                &crtc_state->scaler_state;
        struct intel_crtc *intel_crtc =
                to_intel_crtc(crtc_state->base.crtc);
        struct drm_i915_private *dev_priv = to_i915(intel_crtc->base.dev);
        const struct drm_display_mode *adjusted_mode =
                &crtc_state->base.adjusted_mode;
        int need_scaling;

        /*
         * Src coordinates are already rotated by 270 degrees for
         * the 90/270 degree plane rotation cases (to match the
         * GTT mapping), hence no need to account for rotation here.
         */
        need_scaling = src_w != dst_w || src_h != dst_h;

        if (plane_scaler_check)
                if (pixel_format == DRM_FORMAT_NV12)
                        need_scaling = true;

        if (crtc_state->ycbcr420 && scaler_user == SKL_CRTC_INDEX)
                need_scaling = true;

        /*
         * Scaling/fitting not supported in IF-ID mode in GEN9+
         * TODO: Interlace fetch mode doesn't support YUV420 planar formats.
         * Once NV12 is enabled, handle it here while allocating scaler
         * for NV12.
         */
        if (INTEL_GEN(dev_priv) >= 9 && crtc_state->base.enable &&
            need_scaling && adjusted_mode->flags & DRM_MODE_FLAG_INTERLACE) {
                DRM_DEBUG_KMS("Pipe/Plane scaling not supported with IF-ID mode\n");
                return -EINVAL;
        }

        /*
         * if plane is being disabled or scaler is no more required or force detach
         *  - free scaler binded to this plane/crtc
         *  - in order to do this, update crtc->scaler_usage
         *
         * Here scaler state in crtc_state is set free so that
         * scaler can be assigned to other user. Actual register
         * update to free the scaler is done in plane/panel-fit programming.
         * For this purpose crtc/plane_state->scaler_id isn't reset here.
         */
        if (force_detach || !need_scaling) {
                if (*scaler_id >= 0) {
                        scaler_state->scaler_users &= ~(1 << scaler_user);
                        scaler_state->scalers[*scaler_id].in_use = 0;

                        DRM_DEBUG_KMS("scaler_user index %u.%u: "
                                "Staged freeing scaler id %d scaler_users = 0x%x\n",
                                intel_crtc->pipe, scaler_user, *scaler_id,
                                scaler_state->scaler_users);
                        *scaler_id = -1;
                }
                return 0;
        }

        if (plane_scaler_check && pixel_format == DRM_FORMAT_NV12 &&
            (src_h < SKL_MIN_YUV_420_SRC_H || src_w < SKL_MIN_YUV_420_SRC_W)) {
                DRM_DEBUG_KMS("NV12: src dimensions not met\n");
                return -EINVAL;
        }

        /* range checks */
        if (src_w < SKL_MIN_SRC_W || src_h < SKL_MIN_SRC_H ||
            dst_w < SKL_MIN_DST_W || dst_h < SKL_MIN_DST_H ||
            (IS_GEN11(dev_priv) &&
             (src_w > ICL_MAX_SRC_W || src_h > ICL_MAX_SRC_H ||
              dst_w > ICL_MAX_DST_W || dst_h > ICL_MAX_DST_H)) ||
            (!IS_GEN11(dev_priv) &&
             (src_w > SKL_MAX_SRC_W || src_h > SKL_MAX_SRC_H ||
              dst_w > SKL_MAX_DST_W || dst_h > SKL_MAX_DST_H))) {
                DRM_DEBUG_KMS("scaler_user index %u.%u: src %ux%u dst %ux%u "
                        "size is out of scaler range\n",
                        intel_crtc->pipe, scaler_user, src_w, src_h, dst_w, dst_h);
                return -EINVAL;
        }

        /* mark this plane as a scaler user in crtc_state */
        scaler_state->scaler_users |= (1 << scaler_user);
        DRM_DEBUG_KMS("scaler_user index %u.%u: "
                "staged scaling request for %ux%u->%ux%u scaler_users = 0x%x\n",
                intel_crtc->pipe, scaler_user, src_w, src_h, dst_w, dst_h,
                scaler_state->scaler_users);

        return 0;
}

/**
 * skl_update_scaler_crtc - Stages update to scaler state for a given crtc.
 *
 * @state: crtc's scaler state
 *
 * Return
 *     0 - scaler_usage updated successfully
 *    error - requested scaling cannot be supported or other error condition
 */
int skl_update_scaler_crtc(struct intel_crtc_state *state)
{
        const struct drm_display_mode *adjusted_mode = &state->base.adjusted_mode;

        return skl_update_scaler(state, !state->base.active, SKL_CRTC_INDEX,
                                 &state->scaler_state.scaler_id,
                                 state->pipe_src_w, state->pipe_src_h,
                                 adjusted_mode->crtc_hdisplay,
                                 adjusted_mode->crtc_vdisplay, false, 0);
}

/**
 * skl_update_scaler_plane - Stages update to scaler state for a given plane.
 * @crtc_state: crtc's scaler state
 * @plane_state: atomic plane state to update
 *
 * Return
 *     0 - scaler_usage updated successfully
 *    error - requested scaling cannot be supported or other error condition
 */
static int skl_update_scaler_plane(struct intel_crtc_state *crtc_state,
                                   struct intel_plane_state *plane_state)
{

        struct intel_plane *intel_plane =
                to_intel_plane(plane_state->base.plane);
        struct drm_framebuffer *fb = plane_state->base.fb;
        int ret;

        bool force_detach = !fb || !plane_state->base.visible;

        ret = skl_update_scaler(crtc_state, force_detach,
                                drm_plane_index(&intel_plane->base),
                                &plane_state->scaler_id,
                                drm_rect_width(&plane_state->base.src) >> 16,
                                drm_rect_height(&plane_state->base.src) >> 16,
                                drm_rect_width(&plane_state->base.dst),
                                drm_rect_height(&plane_state->base.dst),
                                fb ? true : false, fb ? fb->format->format : 0);

        if (ret || plane_state->scaler_id < 0)
                return ret;

        /* check colorkey */
        if (plane_state->ckey.flags) {
                DRM_DEBUG_KMS("[PLANE:%d:%s] scaling with color key not allowed",
                              intel_plane->base.base.id,
                              intel_plane->base.name);
                return -EINVAL;
        }

        /* Check src format */
        switch (fb->format->format) {
        case DRM_FORMAT_RGB565:
        case DRM_FORMAT_XBGR8888:
        case DRM_FORMAT_XRGB8888:
        case DRM_FORMAT_ABGR8888:
        case DRM_FORMAT_ARGB8888:
        case DRM_FORMAT_XRGB2101010:
        case DRM_FORMAT_XBGR2101010:
        case DRM_FORMAT_YUYV:
        case DRM_FORMAT_YVYU:
        case DRM_FORMAT_UYVY:
        case DRM_FORMAT_VYUY:
        case DRM_FORMAT_NV12:
                break;
        default:
                DRM_DEBUG_KMS("[PLANE:%d:%s] FB:%d unsupported scaling format 0x%x\n",
                              intel_plane->base.base.id, intel_plane->base.name,
                              fb->base.id, fb->format->format);
                return -EINVAL;
        }

        return 0;
}

static void skylake_scaler_disable(struct intel_crtc *crtc)
{
        int i;

        for (i = 0; i < crtc->num_scalers; i++)
                skl_detach_scaler(crtc, i);
}

static void skylake_pfit_enable(struct intel_crtc *crtc)
{
        struct drm_device *dev = crtc->base.dev;
        struct drm_i915_private *dev_priv = to_i915(dev);
        int pipe = crtc->pipe;
        struct intel_crtc_scaler_state *scaler_state =
                &crtc->config->scaler_state;

        if (crtc->config->pch_pfit.enabled) {
                u16 uv_rgb_hphase, uv_rgb_vphase;
                int pfit_w, pfit_h, hscale, vscale;
                int id;

                if (WARN_ON(crtc->config->scaler_state.scaler_id < 0))
                        return;

                pfit_w = (crtc->config->pch_pfit.size >> 16) & 0xFFFF;
                pfit_h = crtc->config->pch_pfit.size & 0xFFFF;

                hscale = (crtc->config->pipe_src_w << 16) / pfit_w;
                vscale = (crtc->config->pipe_src_h << 16) / pfit_h;

                uv_rgb_hphase = skl_scaler_calc_phase(1, hscale, false);
                uv_rgb_vphase = skl_scaler_calc_phase(1, vscale, false);

                id = scaler_state->scaler_id;
                I915_WRITE(SKL_PS_CTRL(pipe, id), PS_SCALER_EN |
                        PS_FILTER_MEDIUM | scaler_state->scalers[id].mode);
                I915_WRITE_FW(SKL_PS_VPHASE(pipe, id),
                              PS_Y_PHASE(0) | PS_UV_RGB_PHASE(uv_rgb_vphase));
                I915_WRITE_FW(SKL_PS_HPHASE(pipe, id),
                              PS_Y_PHASE(0) | PS_UV_RGB_PHASE(uv_rgb_hphase));
                I915_WRITE(SKL_PS_WIN_POS(pipe, id), crtc->config->pch_pfit.pos);
                I915_WRITE(SKL_PS_WIN_SZ(pipe, id), crtc->config->pch_pfit.size);
        }
}

static void ironlake_pfit_enable(struct intel_crtc *crtc)
{
        struct drm_device *dev = crtc->base.dev;
        struct drm_i915_private *dev_priv = to_i915(dev);
        int pipe = crtc->pipe;

        if (crtc->config->pch_pfit.enabled) {
                /* Force use of hard-coded filter coefficients
                 * as some pre-programmed values are broken,
                 * e.g. x201.
                 */
                if (IS_IVYBRIDGE(dev_priv) || IS_HASWELL(dev_priv))
                        I915_WRITE(PF_CTL(pipe), PF_ENABLE | PF_FILTER_MED_3x3 |
                                                 PF_PIPE_SEL_IVB(pipe));
                else
                        I915_WRITE(PF_CTL(pipe), PF_ENABLE | PF_FILTER_MED_3x3);
                I915_WRITE(PF_WIN_POS(pipe), crtc->config->pch_pfit.pos);
                I915_WRITE(PF_WIN_SZ(pipe), crtc->config->pch_pfit.size);
        }
}

void hsw_enable_ips(const struct intel_crtc_state *crtc_state)
{
        struct intel_crtc *crtc = to_intel_crtc(crtc_state->base.crtc);
        struct drm_device *dev = crtc->base.dev;
        struct drm_i915_private *dev_priv = to_i915(dev);

        if (!crtc_state->ips_enabled)
                return;

        /*
         * We can only enable IPS after we enable a plane and wait for a vblank
         * This function is called from post_plane_update, which is run after
         * a vblank wait.
         */
        WARN_ON(!(crtc_state->active_planes & ~BIT(PLANE_CURSOR)));

        if (IS_BROADWELL(dev_priv)) {
                mutex_lock(&dev_priv->pcu_lock);
                WARN_ON(sandybridge_pcode_write(dev_priv, DISPLAY_IPS_CONTROL,
                                                IPS_ENABLE | IPS_PCODE_CONTROL));
                mutex_unlock(&dev_priv->pcu_lock);
                /* Quoting Art Runyan: "its not safe to expect any particular
                 * value in IPS_CTL bit 31 after enabling IPS through the
                 * mailbox." Moreover, the mailbox may return a bogus state,
                 * so we need to just enable it and continue on.
                 */
        } else {
                I915_WRITE(IPS_CTL, IPS_ENABLE);
                /* The bit only becomes 1 in the next vblank, so this wait here
                 * is essentially intel_wait_for_vblank. If we don't have this
                 * and don't wait for vblanks until the end of crtc_enable, then
                 * the HW state readout code will complain that the expected
                 * IPS_CTL value is not the one we read. */
                if (intel_wait_for_register(dev_priv,
                                            IPS_CTL, IPS_ENABLE, IPS_ENABLE,
                                            50))
                        DRM_ERROR("Timed out waiting for IPS enable\n");
        }
}

void hsw_disable_ips(const struct intel_crtc_state *crtc_state)
{
        struct intel_crtc *crtc = to_intel_crtc(crtc_state->base.crtc);
        struct drm_device *dev = crtc->base.dev;
        struct drm_i915_private *dev_priv = to_i915(dev);

        if (!crtc_state->ips_enabled)
                return;

        if (IS_BROADWELL(dev_priv)) {
                mutex_lock(&dev_priv->pcu_lock);
                WARN_ON(sandybridge_pcode_write(dev_priv, DISPLAY_IPS_CONTROL, 0));
                mutex_unlock(&dev_priv->pcu_lock);
                /*
                 * Wait for PCODE to finish disabling IPS. The BSpec specified
                 * 42ms timeout value leads to occasional timeouts so use 100ms
                 * instead.
                 */
                if (intel_wait_for_register(dev_priv,
                                            IPS_CTL, IPS_ENABLE, 0,
                                            100))
                        DRM_ERROR("Timed out waiting for IPS disable\n");
        } else {
                I915_WRITE(IPS_CTL, 0);
                POSTING_READ(IPS_CTL);
        }

        /* We need to wait for a vblank before we can disable the plane. */
        intel_wait_for_vblank(dev_priv, crtc->pipe);
}

static void intel_crtc_dpms_overlay_disable(struct intel_crtc *intel_crtc)
{
        if (intel_crtc->overlay) {
                struct drm_device *dev = intel_crtc->base.dev;

                mutex_lock(&dev->struct_mutex);
                (void) intel_overlay_switch_off(intel_crtc->overlay);
                mutex_unlock(&dev->struct_mutex);
        }

        /* Let userspace switch the overlay on again. In most cases userspace
         * has to recompute where to put it anyway.
         */
}

/**
 * intel_post_enable_primary - Perform operations after enabling primary plane
 * @crtc: the CRTC whose primary plane was just enabled
 * @new_crtc_state: the enabling state
 *
 * Performs potentially sleeping operations that must be done after the primary
 * plane is enabled, such as updating FBC and IPS.  Note that this may be
 * called due to an explicit primary plane update, or due to an implicit
 * re-enable that is caused when a sprite plane is updated to no longer
 * completely hide the primary plane.
 */
static void
intel_post_enable_primary(struct drm_crtc *crtc,
                          const struct intel_crtc_state *new_crtc_state)
{
        struct drm_device *dev = crtc->dev;
        struct drm_i915_private *dev_priv = to_i915(dev);
        struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
        int pipe = intel_crtc->pipe;

        /*
         * Gen2 reports pipe underruns whenever all planes are disabled.
         * So don't enable underrun reporting before at least some planes
         * are enabled.
         * FIXME: Need to fix the logic to work when we turn off all planes
         * but leave the pipe running.
         */
        if (IS_GEN2(dev_priv))
                intel_set_cpu_fifo_underrun_reporting(dev_priv, pipe, true);

        /* Underruns don't always raise interrupts, so check manually. */
        intel_check_cpu_fifo_underruns(dev_priv);
        intel_check_pch_fifo_underruns(dev_priv);
}

/* FIXME get rid of this and use pre_plane_update */
static void
intel_pre_disable_primary_noatomic(struct drm_crtc *crtc)
{
        struct drm_device *dev = crtc->dev;
        struct drm_i915_private *dev_priv = to_i915(dev);
        struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
        int pipe = intel_crtc->pipe;

        /*
         * Gen2 reports pipe underruns whenever all planes are disabled.
         * So disable underrun reporting before all the planes get disabled.
         */
        if (IS_GEN2(dev_priv))
                intel_set_cpu_fifo_underrun_reporting(dev_priv, pipe, false);

        hsw_disable_ips(to_intel_crtc_state(crtc->state));

        /*
         * Vblank time updates from the shadow to live plane control register
         * are blocked if the memory self-refresh mode is active at that
         * moment. So to make sure the plane gets truly disabled, disable
         * first the self-refresh mode. The self-refresh enable bit in turn
         * will be checked/applied by the HW only at the next frame start
         * event which is after the vblank start event, so we need to have a
         * wait-for-vblank between disabling the plane and the pipe.
         */
        if (HAS_GMCH_DISPLAY(dev_priv) &&
            intel_set_memory_cxsr(dev_priv, false))
                intel_wait_for_vblank(dev_priv, pipe);
}

static bool hsw_pre_update_disable_ips(const struct intel_crtc_state *old_crtc_state,
                                       const struct intel_crtc_state *new_crtc_state)
{
        if (!old_crtc_state->ips_enabled)
                return false;

        if (needs_modeset(&new_crtc_state->base))
                return true;

        return !new_crtc_state->ips_enabled;
}

static bool hsw_post_update_enable_ips(const struct intel_crtc_state *old_crtc_state,
                                       const struct intel_crtc_state *new_crtc_state)
{
        if (!new_crtc_state->ips_enabled)
                return false;

        if (needs_modeset(&new_crtc_state->base))
                return true;

        /*
         * We can't read out IPS on broadwell, assume the worst and
         * forcibly enable IPS on the first fastset.
         */
        if (new_crtc_state->update_pipe &&
            old_crtc_state->base.adjusted_mode.private_flags & I915_MODE_FLAG_INHERITED)
                return true;

        return !old_crtc_state->ips_enabled;
}

static bool needs_nv12_wa(struct drm_i915_private *dev_priv,
                          const struct intel_crtc_state *crtc_state)
{
        if (!crtc_state->nv12_planes)
                return false;

        if (IS_SKYLAKE(dev_priv) || IS_BROXTON(dev_priv))
                return false;

        if ((INTEL_GEN(dev_priv) == 9 && !IS_GEMINILAKE(dev_priv)) ||
            IS_CANNONLAKE(dev_priv))
                return true;

        return false;
}

static void intel_post_plane_update(struct intel_crtc_state *old_crtc_state)
{
        struct intel_crtc *crtc = to_intel_crtc(old_crtc_state->base.crtc);
        struct drm_device *dev = crtc->base.dev;
        struct drm_i915_private *dev_priv = to_i915(dev);
        struct drm_atomic_state *old_state = old_crtc_state->base.state;
        struct intel_crtc_state *pipe_config =
                intel_atomic_get_new_crtc_state(to_intel_atomic_state(old_state),
                                                crtc);
        struct drm_plane *primary = crtc->base.primary;
        struct drm_plane_state *old_primary_state =
                drm_atomic_get_old_plane_state(old_state, primary);

        intel_frontbuffer_flip(to_i915(crtc->base.dev), pipe_config->fb_bits);

        if (pipe_config->update_wm_post && pipe_config->base.active)
                intel_update_watermarks(crtc);

        if (hsw_post_update_enable_ips(old_crtc_state, pipe_config))
                hsw_enable_ips(pipe_config);

        if (old_primary_state) {
                struct drm_plane_state *new_primary_state =
                        drm_atomic_get_new_plane_state(old_state, primary);

                intel_fbc_post_update(crtc);

                if (new_primary_state->visible &&
                    (needs_modeset(&pipe_config->base) ||
                     !old_primary_state->visible))
                        intel_post_enable_primary(&crtc->base, pipe_config);
        }

        /* Display WA 827 */
        if (needs_nv12_wa(dev_priv, old_crtc_state) &&
            !needs_nv12_wa(dev_priv, pipe_config)) {
                skl_wa_clkgate(dev_priv, crtc->pipe, false);
                skl_wa_528(dev_priv, crtc->pipe, false);
        }
}

static void intel_pre_plane_update(struct intel_crtc_state *old_crtc_state,
                                   struct intel_crtc_state *pipe_config)
{
        struct intel_crtc *crtc = to_intel_crtc(old_crtc_state->base.crtc);
        struct drm_device *dev = crtc->base.dev;
        struct drm_i915_private *dev_priv = to_i915(dev);
        struct drm_atomic_state *old_state = old_crtc_state->base.state;
        struct drm_plane *primary = crtc->base.primary;
        struct drm_plane_state *old_primary_state =
                drm_atomic_get_old_plane_state(old_state, primary);
        bool modeset = needs_modeset(&pipe_config->base);
        struct intel_atomic_state *old_intel_state =
                to_intel_atomic_state(old_state);

        if (hsw_pre_update_disable_ips(old_crtc_state, pipe_config))
                hsw_disable_ips(old_crtc_state);

        if (old_primary_state) {
                struct intel_plane_state *new_primary_state =
                        intel_atomic_get_new_plane_state(old_intel_state,
                                                         to_intel_plane(primary));

                intel_fbc_pre_update(crtc, pipe_config, new_primary_state);
                /*
                 * Gen2 reports pipe underruns whenever all planes are disabled.
                 * So disable underrun reporting before all the planes get disabled.
                 */
                if (IS_GEN2(dev_priv) && old_primary_state->visible &&
                    (modeset || !new_primary_state->base.visible))
                        intel_set_cpu_fifo_underrun_reporting(dev_priv, crtc->pipe, false);
        }

        /* Display WA 827 */
        if (!needs_nv12_wa(dev_priv, old_crtc_state) &&
            needs_nv12_wa(dev_priv, pipe_config)) {
                skl_wa_clkgate(dev_priv, crtc->pipe, true);
                skl_wa_528(dev_priv, crtc->pipe, true);
        }

        /*
         * Vblank time updates from the shadow to live plane control register
         * are blocked if the memory self-refresh mode is active at that
         * moment. So to make sure the plane gets truly disabled, disable
         * first the self-refresh mode. The self-refresh enable bit in turn
         * will be checked/applied by the HW only at the next frame start
         * event which is after the vblank start event, so we need to have a
         * wait-for-vblank between disabling the plane and the pipe.
         */
        if (HAS_GMCH_DISPLAY(dev_priv) && old_crtc_state->base.active &&
            pipe_config->disable_cxsr && intel_set_memory_cxsr(dev_priv, false))
                intel_wait_for_vblank(dev_priv, crtc->pipe);

        /*
         * IVB workaround: must disable low power watermarks for at least
         * one frame before enabling scaling.  LP watermarks can be re-enabled
         * when scaling is disabled.
         *
         * WaCxSRDisabledForSpriteScaling:ivb
         */
        if (pipe_config->disable_lp_wm && ilk_disable_lp_wm(dev))
                intel_wait_for_vblank(dev_priv, crtc->pipe);

        /*
         * If we're doing a modeset, we're done.  No need to do any pre-vblank
         * watermark programming here.
         */
        if (needs_modeset(&pipe_config->base))
                return;

        /*
         * For platforms that support atomic watermarks, program the
         * 'intermediate' watermarks immediately.  On pre-gen9 platforms, these
         * will be the intermediate values that are safe for both pre- and
         * post- vblank; when vblank happens, the 'active' values will be set
         * to the final 'target' values and we'll do this again to get the
         * optimal watermarks.  For gen9+ platforms, the values we program here
         * will be the final target values which will get automatically latched
         * at vblank time; no further programming will be necessary.
         *
         * If a platform hasn't been transitioned to atomic watermarks yet,
         * we'll continue to update watermarks the old way, if flags tell
         * us to.
         */
        if (dev_priv->display.initial_watermarks != NULL)
                dev_priv->display.initial_watermarks(old_intel_state,
                                                     pipe_config);
        else if (pipe_config->update_wm_pre)
                intel_update_watermarks(crtc);
}

static void intel_crtc_disable_planes(struct drm_crtc *crtc, unsigned plane_mask)
{
        struct drm_device *dev = crtc->dev;
        struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
        struct drm_plane *p;
        int pipe = intel_crtc->pipe;

        intel_crtc_dpms_overlay_disable(intel_crtc);

        drm_for_each_plane_mask(p, dev, plane_mask)
                to_intel_plane(p)->disable_plane(to_intel_plane(p), intel_crtc);

        /*
         * FIXME: Once we grow proper nuclear flip support out of this we need
         * to compute the mask of flip planes precisely. For the time being
         * consider this a flip to a NULL plane.
         */
        intel_frontbuffer_flip(to_i915(dev), INTEL_FRONTBUFFER_ALL_MASK(pipe));
}

static void intel_encoders_pre_pll_enable(struct drm_crtc *crtc,
                                          struct intel_crtc_state *crtc_state,
                                          struct drm_atomic_state *old_state)
{
        struct drm_connector_state *conn_state;
        struct drm_connector *conn;
        int i;

        for_each_new_connector_in_state(old_state, conn, conn_state, i) {
                struct intel_encoder *encoder =
                        to_intel_encoder(conn_state->best_encoder);

                if (conn_state->crtc != crtc)
                        continue;

                if (encoder->pre_pll_enable)
                        encoder->pre_pll_enable(encoder, crtc_state, conn_state);
        }
}

static void intel_encoders_pre_enable(struct drm_crtc *crtc,
                                      struct intel_crtc_state *crtc_state,
                                      struct drm_atomic_state *old_state)
{
        struct drm_connector_state *conn_state;
        struct drm_connector *conn;
        int i;

        for_each_new_connector_in_state(old_state, conn, conn_state, i) {
                struct intel_encoder *encoder =
                        to_intel_encoder(conn_state->best_encoder);

                if (conn_state->crtc != crtc)
                        continue;

                if (encoder->pre_enable)
                        encoder->pre_enable(encoder, crtc_state, conn_state);
        }
}

static void intel_encoders_enable(struct drm_crtc *crtc,
                                  struct intel_crtc_state *crtc_state,
                                  struct drm_atomic_state *old_state)
{
        struct drm_connector_state *conn_state;
        struct drm_connector *conn;
        int i;

        for_each_new_connector_in_state(old_state, conn, conn_state, i) {
                struct intel_encoder *encoder =
                        to_intel_encoder(conn_state->best_encoder);

                if (conn_state->crtc != crtc)
                        continue;

                encoder->enable(encoder, crtc_state, conn_state);
                intel_opregion_notify_encoder(encoder, true);
        }
}

static void intel_encoders_disable(struct drm_crtc *crtc,
                                   struct intel_crtc_state *old_crtc_state,
                                   struct drm_atomic_state *old_state)
{
        struct drm_connector_state *old_conn_state;
        struct drm_connector *conn;
        int i;

        for_each_old_connector_in_state(old_state, conn, old_conn_state, i) {
                struct intel_encoder *encoder =
                        to_intel_encoder(old_conn_state->best_encoder);

                if (old_conn_state->crtc != crtc)
                        continue;

                intel_opregion_notify_encoder(encoder, false);
                encoder->disable(encoder, old_crtc_state, old_conn_state);
        }
}

static void intel_encoders_post_disable(struct drm_crtc *crtc,
                                        struct intel_crtc_state *old_crtc_state,
                                        struct drm_atomic_state *old_state)
{
        struct drm_connector_state *old_conn_state;
        struct drm_connector *conn;
        int i;

        for_each_old_connector_in_state(old_state, conn, old_conn_state, i) {
                struct intel_encoder *encoder =
                        to_intel_encoder(old_conn_state->best_encoder);

                if (old_conn_state->crtc != crtc)
                        continue;

                if (encoder->post_disable)
                        encoder->post_disable(encoder, old_crtc_state, old_conn_state);
        }
}

static void intel_encoders_post_pll_disable(struct drm_crtc *crtc,
                                            struct intel_crtc_state *old_crtc_state,
                                            struct drm_atomic_state *old_state)
{
        struct drm_connector_state *old_conn_state;
        struct drm_connector *conn;
        int i;

        for_each_old_connector_in_state(old_state, conn, old_conn_state, i) {
                struct intel_encoder *encoder =
                        to_intel_encoder(old_conn_state->best_encoder);

                if (old_conn_state->crtc != crtc)
                        continue;

                if (encoder->post_pll_disable)
                        encoder->post_pll_disable(encoder, old_crtc_state, old_conn_state);
        }
}

static void ironlake_crtc_enable(struct intel_crtc_state *pipe_config,
                                 struct drm_atomic_state *old_state)
{
        struct drm_crtc *crtc = pipe_config->base.crtc;
        struct drm_device *dev = crtc->dev;
        struct drm_i915_private *dev_priv = to_i915(dev);
        struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
        int pipe = intel_crtc->pipe;
        struct intel_atomic_state *old_intel_state =
                to_intel_atomic_state(old_state);

        if (WARN_ON(intel_crtc->active))
                return;

        /*
         * Sometimes spurious CPU pipe underruns happen during FDI
         * training, at least with VGA+HDMI cloning. Suppress them.
         *
         * On ILK we get an occasional spurious CPU pipe underruns
         * between eDP port A enable and vdd enable. Also PCH port
         * enable seems to result in the occasional CPU pipe underrun.
         *
         * Spurious PCH underruns also occur during PCH enabling.
         */
        intel_set_cpu_fifo_underrun_reporting(dev_priv, pipe, false);
        intel_set_pch_fifo_underrun_reporting(dev_priv, pipe, false);

        if (intel_crtc->config->has_pch_encoder)
                intel_prepare_shared_dpll(intel_crtc);

        if (intel_crtc_has_dp_encoder(intel_crtc->config))
                intel_dp_set_m_n(intel_crtc, M1_N1);

        intel_set_pipe_timings(intel_crtc);
        intel_set_pipe_src_size(intel_crtc);

        if (intel_crtc->config->has_pch_encoder) {
                intel_cpu_transcoder_set_m_n(intel_crtc,
                                     &intel_crtc->config->fdi_m_n, NULL);
        }

        ironlake_set_pipeconf(crtc);

        intel_crtc->active = true;

        intel_encoders_pre_enable(crtc, pipe_config, old_state);

        if (intel_crtc->config->has_pch_encoder) {
                /* Note: FDI PLL enabling _must_ be done before we enable the
                 * cpu pipes, hence this is separate from all the other fdi/pch
                 * enabling. */
                ironlake_fdi_pll_enable(intel_crtc);
        } else {
                assert_fdi_tx_disabled(dev_priv, pipe);
                assert_fdi_rx_disabled(dev_priv, pipe);
        }

        ironlake_pfit_enable(intel_crtc);

        /*
         * On ILK+ LUT must be loaded before the pipe is running but with
         * clocks enabled
         */
        intel_color_load_luts(&pipe_config->base);

        if (dev_priv->display.initial_watermarks != NULL)
                dev_priv->display.initial_watermarks(old_intel_state, intel_crtc->config);
        intel_enable_pipe(pipe_config);

        if (intel_crtc->config->has_pch_encoder)
                ironlake_pch_enable(old_intel_state, pipe_config);

        assert_vblank_disabled(crtc);
        drm_crtc_vblank_on(crtc);

        intel_encoders_enable(crtc, pipe_config, old_state);

        if (HAS_PCH_CPT(dev_priv))
                cpt_verify_modeset(dev, intel_crtc->pipe);

        /*
         * Must wait for vblank to avoid spurious PCH FIFO underruns.
         * And a second vblank wait is needed at least on ILK with
         * some interlaced HDMI modes. Let's do the double wait always
         * in case there are more corner cases we don't know about.
         */
        if (intel_crtc->config->has_pch_encoder) {
                intel_wait_for_vblank(dev_priv, pipe);
                intel_wait_for_vblank(dev_priv, pipe);
        }
        intel_set_cpu_fifo_underrun_reporting(dev_priv, pipe, true);
        intel_set_pch_fifo_underrun_reporting(dev_priv, pipe, true);
}

/* IPS only exists on ULT machines and is tied to pipe A. */
static bool hsw_crtc_supports_ips(struct intel_crtc *crtc)
{
        return HAS_IPS(to_i915(crtc->base.dev)) && crtc->pipe == PIPE_A;
}

static void glk_pipe_scaler_clock_gating_wa(struct drm_i915_private *dev_priv,
                                            enum i915_pipe pipe, bool apply)
{
        u32 val = I915_READ(CLKGATE_DIS_PSL(pipe));
        u32 mask = DPF_GATING_DIS | DPF_RAM_GATING_DIS | DPFR_GATING_DIS;

        if (apply)
                val |= mask;
        else
                val &= ~mask;

        I915_WRITE(CLKGATE_DIS_PSL(pipe), val);
}

static void icl_pipe_mbus_enable(struct intel_crtc *crtc)
{
        struct drm_i915_private *dev_priv = to_i915(crtc->base.dev);
        enum i915_pipe pipe = crtc->pipe;
        uint32_t val;

        val = MBUS_DBOX_BW_CREDIT(1) | MBUS_DBOX_A_CREDIT(2);

        /* Program B credit equally to all pipes */
        val |= MBUS_DBOX_B_CREDIT(24 / INTEL_INFO(dev_priv)->num_pipes);

        I915_WRITE(PIPE_MBUS_DBOX_CTL(pipe), val);
}

static void haswell_crtc_enable(struct intel_crtc_state *pipe_config,
                                struct drm_atomic_state *old_state)
{
        struct drm_crtc *crtc = pipe_config->base.crtc;
        struct drm_i915_private *dev_priv = to_i915(crtc->dev);
        struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
        int pipe = intel_crtc->pipe, hsw_workaround_pipe;
        enum transcoder cpu_transcoder = intel_crtc->config->cpu_transcoder;
        struct intel_atomic_state *old_intel_state =
                to_intel_atomic_state(old_state);
        bool psl_clkgate_wa;
        u32 pipe_chicken;

        if (WARN_ON(intel_crtc->active))
                return;

        intel_encoders_pre_pll_enable(crtc, pipe_config, old_state);

        if (intel_crtc->config->shared_dpll)
                intel_enable_shared_dpll(intel_crtc);

        if (INTEL_GEN(dev_priv) >= 11)
                icl_map_plls_to_ports(crtc, pipe_config, old_state);

        intel_encoders_pre_enable(crtc, pipe_config, old_state);

        if (intel_crtc_has_dp_encoder(intel_crtc->config))
                intel_dp_set_m_n(intel_crtc, M1_N1);

        if (!transcoder_is_dsi(cpu_transcoder))
                intel_set_pipe_timings(intel_crtc);

        intel_set_pipe_src_size(intel_crtc);

        if (cpu_transcoder != TRANSCODER_EDP &&
            !transcoder_is_dsi(cpu_transcoder)) {
                I915_WRITE(PIPE_MULT(cpu_transcoder),
                           intel_crtc->config->pixel_multiplier - 1);
        }

        if (intel_crtc->config->has_pch_encoder) {
                intel_cpu_transcoder_set_m_n(intel_crtc,
                                     &intel_crtc->config->fdi_m_n, NULL);
        }

        if (!transcoder_is_dsi(cpu_transcoder))
                haswell_set_pipeconf(crtc);

        haswell_set_pipemisc(crtc);

        intel_color_set_csc(&pipe_config->base);

        intel_crtc->active = true;

        /* Display WA #1180: WaDisableScalarClockGating: glk, cnl */
        psl_clkgate_wa = (IS_GEMINILAKE(dev_priv) || IS_CANNONLAKE(dev_priv)) &&
                         intel_crtc->config->pch_pfit.enabled;
        if (psl_clkgate_wa)
                glk_pipe_scaler_clock_gating_wa(dev_priv, pipe, true);

        if (INTEL_GEN(dev_priv) >= 9)
                skylake_pfit_enable(intel_crtc);
        else
                ironlake_pfit_enable(intel_crtc);

        /*
         * On ILK+ LUT must be loaded before the pipe is running but with
         * clocks enabled
         */
        intel_color_load_luts(&pipe_config->base);

        /*
         * Display WA #1153: enable hardware to bypass the alpha math
         * and rounding for per-pixel values 00 and 0xff
         */
        if (INTEL_GEN(dev_priv) >= 11) {
                pipe_chicken = I915_READ(PIPE_CHICKEN(pipe));
                if (!(pipe_chicken & PER_PIXEL_ALPHA_BYPASS_EN))
                        I915_WRITE_FW(PIPE_CHICKEN(pipe),
                                      pipe_chicken | PER_PIXEL_ALPHA_BYPASS_EN);
        }

        intel_ddi_set_pipe_settings(pipe_config);
        if (!transcoder_is_dsi(cpu_transcoder))
                intel_ddi_enable_transcoder_func(pipe_config);

        if (dev_priv->display.initial_watermarks != NULL)
                dev_priv->display.initial_watermarks(old_intel_state, pipe_config);

        if (INTEL_GEN(dev_priv) >= 11)
                icl_pipe_mbus_enable(intel_crtc);

        /* XXX: Do the pipe assertions at the right place for BXT DSI. */
        if (!transcoder_is_dsi(cpu_transcoder))
                intel_enable_pipe(pipe_config);

        if (intel_crtc->config->has_pch_encoder)
                lpt_pch_enable(old_intel_state, pipe_config);

        if (intel_crtc_has_type(intel_crtc->config, INTEL_OUTPUT_DP_MST))
                intel_ddi_set_vc_payload_alloc(pipe_config, true);

        assert_vblank_disabled(crtc);
        drm_crtc_vblank_on(crtc);

        intel_encoders_enable(crtc, pipe_config, old_state);

        if (psl_clkgate_wa) {
                intel_wait_for_vblank(dev_priv, pipe);
                glk_pipe_scaler_clock_gating_wa(dev_priv, pipe, false);
        }

        /* If we change the relative order between pipe/planes enabling, we need
         * to change the workaround. */
        hsw_workaround_pipe = pipe_config->hsw_workaround_pipe;
        if (IS_HASWELL(dev_priv) && hsw_workaround_pipe != INVALID_PIPE) {
                intel_wait_for_vblank(dev_priv, hsw_workaround_pipe);
                intel_wait_for_vblank(dev_priv, hsw_workaround_pipe);
        }
}

static void ironlake_pfit_disable(struct intel_crtc *crtc, bool force)
{
        struct drm_device *dev = crtc->base.dev;
        struct drm_i915_private *dev_priv = to_i915(dev);
        int pipe = crtc->pipe;

        /* To avoid upsetting the power well on haswell only disable the pfit if
         * it's in use. The hw state code will make sure we get this right. */
        if (force || crtc->config->pch_pfit.enabled) {
                I915_WRITE(PF_CTL(pipe), 0);
                I915_WRITE(PF_WIN_POS(pipe), 0);
                I915_WRITE(PF_WIN_SZ(pipe), 0);
        }
}

static void ironlake_crtc_disable(struct intel_crtc_state *old_crtc_state,
                                  struct drm_atomic_state *old_state)
{
        struct drm_crtc *crtc = old_crtc_state->base.crtc;
        struct drm_device *dev = crtc->dev;
        struct drm_i915_private *dev_priv = to_i915(dev);
        struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
        int pipe = intel_crtc->pipe;

        /*
         * Sometimes spurious CPU pipe underruns happen when the
         * pipe is already disabled, but FDI RX/TX is still enabled.
         * Happens at least with VGA+HDMI cloning. Suppress them.
         */
        intel_set_cpu_fifo_underrun_reporting(dev_priv, pipe, false);
        intel_set_pch_fifo_underrun_reporting(dev_priv, pipe, false);

        intel_encoders_disable(crtc, old_crtc_state, old_state);

        drm_crtc_vblank_off(crtc);
        assert_vblank_disabled(crtc);

        intel_disable_pipe(old_crtc_state);

        ironlake_pfit_disable(intel_crtc, false);

        if (intel_crtc->config->has_pch_encoder)
                ironlake_fdi_disable(crtc);

        intel_encoders_post_disable(crtc, old_crtc_state, old_state);

        if (intel_crtc->config->has_pch_encoder) {
                ironlake_disable_pch_transcoder(dev_priv, pipe);

                if (HAS_PCH_CPT(dev_priv)) {
                        i915_reg_t reg;
                        u32 temp;

                        /* disable TRANS_DP_CTL */
                        reg = TRANS_DP_CTL(pipe);
                        temp = I915_READ(reg);
                        temp &= ~(TRANS_DP_OUTPUT_ENABLE |
                                  TRANS_DP_PORT_SEL_MASK);
                        temp |= TRANS_DP_PORT_SEL_NONE;
                        I915_WRITE(reg, temp);

                        /* disable DPLL_SEL */
                        temp = I915_READ(PCH_DPLL_SEL);
                        temp &= ~(TRANS_DPLL_ENABLE(pipe) | TRANS_DPLLB_SEL(pipe));
                        I915_WRITE(PCH_DPLL_SEL, temp);
                }

                ironlake_fdi_pll_disable(intel_crtc);
        }

        intel_set_cpu_fifo_underrun_reporting(dev_priv, pipe, true);
        intel_set_pch_fifo_underrun_reporting(dev_priv, pipe, true);
}

static void haswell_crtc_disable(struct intel_crtc_state *old_crtc_state,
                                 struct drm_atomic_state *old_state)
{
        struct drm_crtc *crtc = old_crtc_state->base.crtc;
        struct drm_i915_private *dev_priv = to_i915(crtc->dev);
        struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
        enum transcoder cpu_transcoder = old_crtc_state->cpu_transcoder;

        intel_encoders_disable(crtc, old_crtc_state, old_state);

        drm_crtc_vblank_off(crtc);
        assert_vblank_disabled(crtc);

        /* XXX: Do the pipe assertions at the right place for BXT DSI. */
        if (!transcoder_is_dsi(cpu_transcoder))
                intel_disable_pipe(old_crtc_state);

        if (intel_crtc_has_type(old_crtc_state, INTEL_OUTPUT_DP_MST))
                intel_ddi_set_vc_payload_alloc(old_crtc_state, false);

        if (!transcoder_is_dsi(cpu_transcoder))
                intel_ddi_disable_transcoder_func(old_crtc_state);

        if (INTEL_GEN(dev_priv) >= 9)
                skylake_scaler_disable(intel_crtc);
        else
                ironlake_pfit_disable(intel_crtc, false);

        intel_encoders_post_disable(crtc, old_crtc_state, old_state);

        if (INTEL_GEN(dev_priv) >= 11)
                icl_unmap_plls_to_ports(crtc, old_crtc_state, old_state);
}

static void i9xx_pfit_enable(struct intel_crtc *crtc)
{
        struct drm_device *dev = crtc->base.dev;
        struct drm_i915_private *dev_priv = to_i915(dev);
        struct intel_crtc_state *pipe_config = crtc->config;

        if (!pipe_config->gmch_pfit.control)
                return;

        /*
         * The panel fitter should only be adjusted whilst the pipe is disabled,
         * according to register description and PRM.
         */
        WARN_ON(I915_READ(PFIT_CONTROL) & PFIT_ENABLE);
        assert_pipe_disabled(dev_priv, crtc->pipe);

        I915_WRITE(PFIT_PGM_RATIOS, pipe_config->gmch_pfit.pgm_ratios);
        I915_WRITE(PFIT_CONTROL, pipe_config->gmch_pfit.control);

        /* Border color in case we don't scale up to the full screen. Black by
         * default, change to something else for debugging. */
        I915_WRITE(BCLRPAT(crtc->pipe), 0);
}

bool intel_port_is_combophy(struct drm_i915_private *dev_priv, enum port port)
{
        if (port == PORT_NONE)
                return false;

        if (IS_ICELAKE(dev_priv))
                return port <= PORT_B;

        return false;
}

bool intel_port_is_tc(struct drm_i915_private *dev_priv, enum port port)
{
        if (IS_ICELAKE(dev_priv))
                return port >= PORT_C && port <= PORT_F;

        return false;
}

enum tc_port intel_port_to_tc(struct drm_i915_private *dev_priv, enum port port)
{
        if (!intel_port_is_tc(dev_priv, port))
                return PORT_TC_NONE;

        return port - PORT_C;
}

enum intel_display_power_domain intel_port_to_power_domain(enum port port)
{
        switch (port) {
        case PORT_A:
                return POWER_DOMAIN_PORT_DDI_A_LANES;
        case PORT_B:
                return POWER_DOMAIN_PORT_DDI_B_LANES;
        case PORT_C:
                return POWER_DOMAIN_PORT_DDI_C_LANES;
        case PORT_D:
                return POWER_DOMAIN_PORT_DDI_D_LANES;
        case PORT_E:
                return POWER_DOMAIN_PORT_DDI_E_LANES;
        case PORT_F:
                return POWER_DOMAIN_PORT_DDI_F_LANES;
        default:
                MISSING_CASE(port);
                return POWER_DOMAIN_PORT_OTHER;
        }
}

static u64 get_crtc_power_domains(struct drm_crtc *crtc,
                                  struct intel_crtc_state *crtc_state)
{
        struct drm_device *dev = crtc->dev;
        struct drm_i915_private *dev_priv = to_i915(dev);
        struct drm_encoder *encoder;
        struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
        enum i915_pipe pipe = intel_crtc->pipe;
        u64 mask;
        enum transcoder transcoder = crtc_state->cpu_transcoder;

        if (!crtc_state->base.active)
                return 0;

        mask = BIT_ULL(POWER_DOMAIN_PIPE(pipe));
        mask |= BIT_ULL(POWER_DOMAIN_TRANSCODER(transcoder));
        if (crtc_state->pch_pfit.enabled ||
            crtc_state->pch_pfit.force_thru)
                mask |= BIT_ULL(POWER_DOMAIN_PIPE_PANEL_FITTER(pipe));

        drm_for_each_encoder_mask(encoder, dev, crtc_state->base.encoder_mask) {
                struct intel_encoder *intel_encoder = to_intel_encoder(encoder);

                mask |= BIT_ULL(intel_encoder->power_domain);
        }

        if (HAS_DDI(dev_priv) && crtc_state->has_audio)
                mask |= BIT_ULL(POWER_DOMAIN_AUDIO);

        if (crtc_state->shared_dpll)
                mask |= BIT_ULL(POWER_DOMAIN_PLLS);

        return mask;
}

static u64
modeset_get_crtc_power_domains(struct drm_crtc *crtc,
                               struct intel_crtc_state *crtc_state)
{
        struct drm_i915_private *dev_priv = to_i915(crtc->dev);
        struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
        enum intel_display_power_domain domain;
        u64 domains, new_domains, old_domains;

        old_domains = intel_crtc->enabled_power_domains;
        intel_crtc->enabled_power_domains = new_domains =
                get_crtc_power_domains(crtc, crtc_state);

        domains = new_domains & ~old_domains;

        for_each_power_domain(domain, domains)
                intel_display_power_get(dev_priv, domain);

        return old_domains & ~new_domains;
}

static void modeset_put_power_domains(struct drm_i915_private *dev_priv,
                                      u64 domains)
{
        enum intel_display_power_domain domain;

        for_each_power_domain(domain, domains)
                intel_display_power_put(dev_priv, domain);
}

static void valleyview_crtc_enable(struct intel_crtc_state *pipe_config,
                                   struct drm_atomic_state *old_state)
{
        struct intel_atomic_state *old_intel_state =
                to_intel_atomic_state(old_state);
        struct drm_crtc *crtc = pipe_config->base.crtc;
        struct drm_device *dev = crtc->dev;
        struct drm_i915_private *dev_priv = to_i915(dev);
        struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
        int pipe = intel_crtc->pipe;

        if (WARN_ON(intel_crtc->active))
                return;

        if (intel_crtc_has_dp_encoder(intel_crtc->config))
                intel_dp_set_m_n(intel_crtc, M1_N1);

        intel_set_pipe_timings(intel_crtc);
        intel_set_pipe_src_size(intel_crtc);

        if (IS_CHERRYVIEW(dev_priv) && pipe == PIPE_B) {
                struct drm_i915_private *dev_priv = to_i915(dev);

                I915_WRITE(CHV_BLEND(pipe), CHV_BLEND_LEGACY);
                I915_WRITE(CHV_CANVAS(pipe), 0);
        }

        i9xx_set_pipeconf(intel_crtc);

        intel_color_set_csc(&pipe_config->base);

        intel_crtc->active = true;

        intel_set_cpu_fifo_underrun_reporting(dev_priv, pipe, true);

        intel_encoders_pre_pll_enable(crtc, pipe_config, old_state);

        if (IS_CHERRYVIEW(dev_priv)) {
                chv_prepare_pll(intel_crtc, intel_crtc->config);
                chv_enable_pll(intel_crtc, intel_crtc->config);
        } else {
                vlv_prepare_pll(intel_crtc, intel_crtc->config);
                vlv_enable_pll(intel_crtc, intel_crtc->config);
        }

        intel_encoders_pre_enable(crtc, pipe_config, old_state);

        i9xx_pfit_enable(intel_crtc);

        intel_color_load_luts(&pipe_config->base);

        dev_priv->display.initial_watermarks(old_intel_state,
                                             pipe_config);
        intel_enable_pipe(pipe_config);

        assert_vblank_disabled(crtc);
        drm_crtc_vblank_on(crtc);

        intel_encoders_enable(crtc, pipe_config, old_state);
}

static void i9xx_set_pll_dividers(struct intel_crtc *crtc)
{
        struct drm_device *dev = crtc->base.dev;
        struct drm_i915_private *dev_priv = to_i915(dev);

        I915_WRITE(FP0(crtc->pipe), crtc->config->dpll_hw_state.fp0);
        I915_WRITE(FP1(crtc->pipe), crtc->config->dpll_hw_state.fp1);
}

static void i9xx_crtc_enable(struct intel_crtc_state *pipe_config,
                             struct drm_atomic_state *old_state)
{
        struct intel_atomic_state *old_intel_state =
                to_intel_atomic_state(old_state);
        struct drm_crtc *crtc = pipe_config->base.crtc;
        struct drm_device *dev = crtc->dev;
        struct drm_i915_private *dev_priv = to_i915(dev);
        struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
        enum i915_pipe pipe = intel_crtc->pipe;

        if (WARN_ON(intel_crtc->active))
                return;

        i9xx_set_pll_dividers(intel_crtc);

        if (intel_crtc_has_dp_encoder(intel_crtc->config))
                intel_dp_set_m_n(intel_crtc, M1_N1);

        intel_set_pipe_timings(intel_crtc);
        intel_set_pipe_src_size(intel_crtc);

        i9xx_set_pipeconf(intel_crtc);

        intel_crtc->active = true;

        if (!IS_GEN2(dev_priv))
                intel_set_cpu_fifo_underrun_reporting(dev_priv, pipe, true);

        intel_encoders_pre_enable(crtc, pipe_config, old_state);

        i9xx_enable_pll(intel_crtc, pipe_config);

        i9xx_pfit_enable(intel_crtc);

        intel_color_load_luts(&pipe_config->base);

        if (dev_priv->display.initial_watermarks != NULL)
                dev_priv->display.initial_watermarks(old_intel_state,
                                                     intel_crtc->config);
        else
                intel_update_watermarks(intel_crtc);
        intel_enable_pipe(pipe_config);

        assert_vblank_disabled(crtc);
        drm_crtc_vblank_on(crtc);

        intel_encoders_enable(crtc, pipe_config, old_state);
}

static void i9xx_pfit_disable(struct intel_crtc *crtc)
{
        struct drm_device *dev = crtc->base.dev;
        struct drm_i915_private *dev_priv = to_i915(dev);

        if (!crtc->config->gmch_pfit.control)
                return;

        assert_pipe_disabled(dev_priv, crtc->pipe);

        DRM_DEBUG_KMS("disabling pfit, current: 0x%08x\n",
                      I915_READ(PFIT_CONTROL));
        I915_WRITE(PFIT_CONTROL, 0);
}

static void i9xx_crtc_disable(struct intel_crtc_state *old_crtc_state,
                              struct drm_atomic_state *old_state)
{
        struct drm_crtc *crtc = old_crtc_state->base.crtc;
        struct drm_device *dev = crtc->dev;
        struct drm_i915_private *dev_priv = to_i915(dev);
        struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
        int pipe = intel_crtc->pipe;

        /*
         * On gen2 planes are double buffered but the pipe isn't, so we must
         * wait for planes to fully turn off before disabling the pipe.
         */
        if (IS_GEN2(dev_priv))
                intel_wait_for_vblank(dev_priv, pipe);

        intel_encoders_disable(crtc, old_crtc_state, old_state);

        drm_crtc_vblank_off(crtc);
        assert_vblank_disabled(crtc);

        intel_disable_pipe(old_crtc_state);

        i9xx_pfit_disable(intel_crtc);

        intel_encoders_post_disable(crtc, old_crtc_state, old_state);

        if (!intel_crtc_has_type(intel_crtc->config, INTEL_OUTPUT_DSI)) {
                if (IS_CHERRYVIEW(dev_priv))
                        chv_disable_pll(dev_priv, pipe);
                else if (IS_VALLEYVIEW(dev_priv))
                        vlv_disable_pll(dev_priv, pipe);
                else
                        i9xx_disable_pll(intel_crtc);
        }

        intel_encoders_post_pll_disable(crtc, old_crtc_state, old_state);

        if (!IS_GEN2(dev_priv))
                intel_set_cpu_fifo_underrun_reporting(dev_priv, pipe, false);

        if (!dev_priv->display.initial_watermarks)
                intel_update_watermarks(intel_crtc);

        /* clock the pipe down to 640x480@60 to potentially save power */
        if (IS_I830(dev_priv))
                i830_enable_pipe(dev_priv, pipe);
}

static void intel_crtc_disable_noatomic(struct drm_crtc *crtc,
                                        struct drm_modeset_acquire_ctx *ctx)
{
        struct intel_encoder *encoder;
        struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
        struct drm_i915_private *dev_priv = to_i915(crtc->dev);
        enum intel_display_power_domain domain;
        struct intel_plane *plane;
        u64 domains;
        struct drm_atomic_state *state;
        struct intel_crtc_state *crtc_state;
        int ret;

        if (!intel_crtc->active)
                return;

        for_each_intel_plane_on_crtc(&dev_priv->drm, intel_crtc, plane) {
                const struct intel_plane_state *plane_state =
                        to_intel_plane_state(plane->base.state);

                if (plane_state->base.visible)
                        intel_plane_disable_noatomic(intel_crtc, plane);
        }

        state = drm_atomic_state_alloc(crtc->dev);
        if (!state) {
                DRM_DEBUG_KMS("failed to disable [CRTC:%d:%s], out of memory",
                              crtc->base.id, crtc->name);
                return;
        }

        state->acquire_ctx = ctx;

        /* Everything's already locked, -EDEADLK can't happen. */
        crtc_state = intel_atomic_get_crtc_state(state, intel_crtc);
        ret = drm_atomic_add_affected_connectors(state, crtc);

        WARN_ON(IS_ERR(crtc_state) || ret);

        dev_priv->display.crtc_disable(crtc_state, state);

        drm_atomic_state_put(state);

        DRM_DEBUG_KMS("[CRTC:%d:%s] hw state adjusted, was enabled, now disabled\n",
                      crtc->base.id, crtc->name);

        WARN_ON(drm_atomic_set_mode_for_crtc(crtc->state, NULL) < 0);
        crtc->state->active = false;
        intel_crtc->active = false;
        crtc->enabled = false;
        crtc->state->connector_mask = 0;
        crtc->state->encoder_mask = 0;

        for_each_encoder_on_crtc(crtc->dev, crtc, encoder)
                encoder->base.crtc = NULL;

        intel_fbc_disable(intel_crtc);
        intel_update_watermarks(intel_crtc);
        intel_disable_shared_dpll(intel_crtc);

        domains = intel_crtc->enabled_power_domains;
        for_each_power_domain(domain, domains)
                intel_display_power_put(dev_priv, domain);
        intel_crtc->enabled_power_domains = 0;

        dev_priv->active_crtcs &= ~(1 << intel_crtc->pipe);
        dev_priv->min_cdclk[intel_crtc->pipe] = 0;
        dev_priv->min_voltage_level[intel_crtc->pipe] = 0;
}

/*
 * turn all crtc's off, but do not adjust state
 * This has to be paired with a call to intel_modeset_setup_hw_state.
 */
int intel_display_suspend(struct drm_device *dev)
{
        struct drm_i915_private *dev_priv = to_i915(dev);
        struct drm_atomic_state *state;
        int ret;

        state = drm_atomic_helper_suspend(dev);
        ret = PTR_ERR_OR_ZERO(state);
        if (ret)
                DRM_ERROR("Suspending crtc's failed with %i\n", ret);
        else
                dev_priv->modeset_restore_state = state;
        return ret;
}

void intel_encoder_destroy(struct drm_encoder *encoder)
{
        struct intel_encoder *intel_encoder = to_intel_encoder(encoder);

        drm_encoder_cleanup(encoder);
        kfree(intel_encoder);
}

/* Cross check the actual hw state with our own modeset state tracking (and it's
 * internal consistency). */
static void intel_connector_verify_state(struct drm_crtc_state *crtc_state,
                                         struct drm_connector_state *conn_state)
{
        struct intel_connector *connector = to_intel_connector(conn_state->connector);

        DRM_DEBUG_KMS("[CONNECTOR:%d:%s]\n",
                      connector->base.base.id,
                      connector->base.name);

        if (connector->get_hw_state(connector)) {
                struct intel_encoder *encoder = connector->encoder;

                I915_STATE_WARN(!crtc_state,
                         "connector enabled without attached crtc\n");

                if (!crtc_state)
                        return;

                I915_STATE_WARN(!crtc_state->active,
                      "connector is active, but attached crtc isn't\n");

                if (!encoder || encoder->type == INTEL_OUTPUT_DP_MST)
                        return;

                I915_STATE_WARN(conn_state->best_encoder != &encoder->base,
                        "atomic encoder doesn't match attached encoder\n");

                I915_STATE_WARN(conn_state->crtc != encoder->base.crtc,
                        "attached encoder crtc differs from connector crtc\n");
        } else {
                I915_STATE_WARN(crtc_state && crtc_state->active,
                        "attached crtc is active, but connector isn't\n");
                I915_STATE_WARN(!crtc_state && conn_state->best_encoder,
                        "best encoder set without crtc!\n");
        }
}

int intel_connector_init(struct intel_connector *connector)
{
        struct intel_digital_connector_state *conn_state;

        /*
         * Allocate enough memory to hold intel_digital_connector_state,
         * This might be a few bytes too many, but for connectors that don't
         * need it we'll free the state and allocate a smaller one on the first
         * succesful commit anyway.
         */
        conn_state = kzalloc(sizeof(*conn_state), GFP_KERNEL);
        if (!conn_state)
                return -ENOMEM;

        __drm_atomic_helper_connector_reset(&connector->base,
                                            &conn_state->base);

        return 0;
}

struct intel_connector *intel_connector_alloc(void)
{
        struct intel_connector *connector;

        connector = kzalloc(sizeof *connector, GFP_KERNEL);
        if (!connector)
                return NULL;

        if (intel_connector_init(connector) < 0) {
                kfree(connector);
                return NULL;
        }

        return connector;
}

/*
 * Free the bits allocated by intel_connector_alloc.
 * This should only be used after intel_connector_alloc has returned
 * successfully, and before drm_connector_init returns successfully.
 * Otherwise the destroy callbacks for the connector and the state should
 * take care of proper cleanup/free
 */
void intel_connector_free(struct intel_connector *connector)
{
        kfree(to_intel_digital_connector_state(connector->base.state));
        kfree(connector);
}

/* Simple connector->get_hw_state implementation for encoders that support only
 * one connector and no cloning and hence the encoder state determines the state
 * of the connector. */
bool intel_connector_get_hw_state(struct intel_connector *connector)
{
        enum i915_pipe pipe = 0;
        struct intel_encoder *encoder = connector->encoder;

        return encoder->get_hw_state(encoder, &pipe);
}

static int pipe_required_fdi_lanes(struct intel_crtc_state *crtc_state)
{
        if (crtc_state->base.enable && crtc_state->has_pch_encoder)
                return crtc_state->fdi_lanes;

        return 0;
}

static int ironlake_check_fdi_lanes(struct drm_device *dev, enum i915_pipe pipe,
                                     struct intel_crtc_state *pipe_config)
{
        struct drm_i915_private *dev_priv = to_i915(dev);
        struct drm_atomic_state *state = pipe_config->base.state;
        struct intel_crtc *other_crtc;
        struct intel_crtc_state *other_crtc_state;

        DRM_DEBUG_KMS("checking fdi config on pipe %c, lanes %i\n",
                      pipe_name(pipe), pipe_config->fdi_lanes);
        if (pipe_config->fdi_lanes > 4) {
                DRM_DEBUG_KMS("invalid fdi lane config on pipe %c: %i lanes\n",
                              pipe_name(pipe), pipe_config->fdi_lanes);
                return -EINVAL;
        }

        if (IS_HASWELL(dev_priv) || IS_BROADWELL(dev_priv)) {
                if (pipe_config->fdi_lanes > 2) {
                        DRM_DEBUG_KMS("only 2 lanes on haswell, required: %i lanes\n",
                                      pipe_config->fdi_lanes);
                        return -EINVAL;
                } else {
                        return 0;
                }
        }

        if (INTEL_INFO(dev_priv)->num_pipes == 2)
                return 0;

        /* Ivybridge 3 pipe is really complicated */
        switch (pipe) {
        case PIPE_A:
                return 0;
        case PIPE_B:
                if (pipe_config->fdi_lanes <= 2)
                        return 0;

                other_crtc = intel_get_crtc_for_pipe(dev_priv, PIPE_C);
                other_crtc_state =
                        intel_atomic_get_crtc_state(state, other_crtc);
                if (IS_ERR(other_crtc_state))
                        return PTR_ERR(other_crtc_state);

                if (pipe_required_fdi_lanes(other_crtc_state) > 0) {
                        DRM_DEBUG_KMS("invalid shared fdi lane config on pipe %c: %i lanes\n",
                                      pipe_name(pipe), pipe_config->fdi_lanes);
                        return -EINVAL;
                }
                return 0;
        case PIPE_C:
                if (pipe_config->fdi_lanes > 2) {
                        DRM_DEBUG_KMS("only 2 lanes on pipe %c: required %i lanes\n",
                                      pipe_name(pipe), pipe_config->fdi_lanes);
                        return -EINVAL;
                }

                other_crtc = intel_get_crtc_for_pipe(dev_priv, PIPE_B);
                other_crtc_state =
                        intel_atomic_get_crtc_state(state, other_crtc);
                if (IS_ERR(other_crtc_state))
                        return PTR_ERR(other_crtc_state);

                if (pipe_required_fdi_lanes(other_crtc_state) > 2) {
                        DRM_DEBUG_KMS("fdi link B uses too many lanes to enable link C\n");
                        return -EINVAL;
                }
                return 0;
        default:
                BUG();
        }
}

#define RETRY 1
static int ironlake_fdi_compute_config(struct intel_crtc *intel_crtc,
                                       struct intel_crtc_state *pipe_config)
{
        struct drm_device *dev = intel_crtc->base.dev;
        const struct drm_display_mode *adjusted_mode = &pipe_config->base.adjusted_mode;
        int lane, link_bw, fdi_dotclock, ret;
        bool needs_recompute = false;

retry:
        /* FDI is a binary signal running at ~2.7GHz, encoding
         * each output octet as 10 bits. The actual frequency
         * is stored as a divider into a 100MHz clock, and the
         * mode pixel clock is stored in units of 1KHz.
         * Hence the bw of each lane in terms of the mode signal
         * is:
         */
        link_bw = intel_fdi_link_freq(to_i915(dev), pipe_config);

        fdi_dotclock = adjusted_mode->crtc_clock;

        lane = ironlake_get_lanes_required(fdi_dotclock, link_bw,
                                           pipe_config->pipe_bpp);

        pipe_config->fdi_lanes = lane;

        intel_link_compute_m_n(pipe_config->pipe_bpp, lane, fdi_dotclock,
                               link_bw, &pipe_config->fdi_m_n, false);

        ret = ironlake_check_fdi_lanes(dev, intel_crtc->pipe, pipe_config);
        if (ret == -EINVAL && pipe_config->pipe_bpp > 6*3) {
                pipe_config->pipe_bpp -= 2*3;
                DRM_DEBUG_KMS("fdi link bw constraint, reducing pipe bpp to %i\n",
                              pipe_config->pipe_bpp);
                needs_recompute = true;
                pipe_config->bw_constrained = true;

                goto retry;
        }

        if (needs_recompute)
                return RETRY;

        return ret;
}

bool hsw_crtc_state_ips_capable(const struct intel_crtc_state *crtc_state)
{
        struct intel_crtc *crtc = to_intel_crtc(crtc_state->base.crtc);
        struct drm_i915_private *dev_priv = to_i915(crtc->base.dev);

        /* IPS only exists on ULT machines and is tied to pipe A. */
        if (!hsw_crtc_supports_ips(crtc))
                return false;

        if (!i915_modparams.enable_ips)
                return false;

        if (crtc_state->pipe_bpp > 24)
                return false;

        /*
         * We compare against max which means we must take
         * the increased cdclk requirement into account when
         * calculating the new cdclk.
         *
         * Should measure whether using a lower cdclk w/o IPS
         */
        if (IS_BROADWELL(dev_priv) &&
            crtc_state->pixel_rate > dev_priv->max_cdclk_freq * 95 / 100)
                return false;

        return true;
}

static bool hsw_compute_ips_config(struct intel_crtc_state *crtc_state)
{
        struct drm_i915_private *dev_priv =
                to_i915(crtc_state->base.crtc->dev);
        struct intel_atomic_state *intel_state =
                to_intel_atomic_state(crtc_state->base.state);

        if (!hsw_crtc_state_ips_capable(crtc_state))
                return false;

        if (crtc_state->ips_force_disable)
                return false;

        /* IPS should be fine as long as at least one plane is enabled. */
        if (!(crtc_state->active_planes & ~BIT(PLANE_CURSOR)))
                return false;

        /* pixel rate mustn't exceed 95% of cdclk with IPS on BDW */
        if (IS_BROADWELL(dev_priv) &&
            crtc_state->pixel_rate > intel_state->cdclk.logical.cdclk * 95 / 100)
                return false;

        return true;
}

static bool intel_crtc_supports_double_wide(const struct intel_crtc *crtc)
{
        const struct drm_i915_private *dev_priv = to_i915(crtc->base.dev);

        /* GDG double wide on either pipe, otherwise pipe A only */
        return INTEL_GEN(dev_priv) < 4 &&
                (crtc->pipe == PIPE_A || IS_I915G(dev_priv));
}

static uint32_t ilk_pipe_pixel_rate(const struct intel_crtc_state *pipe_config)
{
        uint32_t pixel_rate;

        pixel_rate = pipe_config->base.adjusted_mode.crtc_clock;

        /*
         * We only use IF-ID interlacing. If we ever use
         * PF-ID we'll need to adjust the pixel_rate here.
         */

        if (pipe_config->pch_pfit.enabled) {
                uint64_t pipe_w, pipe_h, pfit_w, pfit_h;
                uint32_t pfit_size = pipe_config->pch_pfit.size;

                pipe_w = pipe_config->pipe_src_w;
                pipe_h = pipe_config->pipe_src_h;

                pfit_w = (pfit_size >> 16) & 0xFFFF;
                pfit_h = pfit_size & 0xFFFF;
                if (pipe_w < pfit_w)
                        pipe_w = pfit_w;
                if (pipe_h < pfit_h)
                        pipe_h = pfit_h;

                if (WARN_ON(!pfit_w || !pfit_h))
                        return pixel_rate;

                pixel_rate = div_u64((uint64_t) pixel_rate * pipe_w * pipe_h,
                                     pfit_w * pfit_h);
        }

        return pixel_rate;
}

static void intel_crtc_compute_pixel_rate(struct intel_crtc_state *crtc_state)
{
        struct drm_i915_private *dev_priv = to_i915(crtc_state->base.crtc->dev);

        if (HAS_GMCH_DISPLAY(dev_priv))
                /* FIXME calculate proper pipe pixel rate for GMCH pfit */
                crtc_state->pixel_rate =
                        crtc_state->base.adjusted_mode.crtc_clock;
        else
                crtc_state->pixel_rate =
                        ilk_pipe_pixel_rate(crtc_state);
}

static int intel_crtc_compute_config(struct intel_crtc *crtc,
                                     struct intel_crtc_state *pipe_config)
{
        struct drm_device *dev = crtc->base.dev;
        struct drm_i915_private *dev_priv = to_i915(dev);
        const struct drm_display_mode *adjusted_mode = &pipe_config->base.adjusted_mode;
        int clock_limit = dev_priv->max_dotclk_freq;

        if (INTEL_GEN(dev_priv) < 4) {
                clock_limit = dev_priv->max_cdclk_freq * 9 / 10;

                /*
                 * Enable double wide mode when the dot clock
                 * is > 90% of the (display) core speed.
                 */
                if (intel_crtc_supports_double_wide(crtc) &&
                    adjusted_mode->crtc_clock > clock_limit) {
                        clock_limit = dev_priv->max_dotclk_freq;
                        pipe_config->double_wide = true;
                }
        }

        if (adjusted_mode->crtc_clock > clock_limit) {
                DRM_DEBUG_KMS("requested pixel clock (%d kHz) too high (max: %d kHz, double wide: %s)\n",
                              adjusted_mode->crtc_clock, clock_limit,
                              yesno(pipe_config->double_wide));
                return -EINVAL;
        }

        if (pipe_config->ycbcr420 && pipe_config->base.ctm) {
                /*
                 * There is only one pipe CSC unit per pipe, and we need that
                 * for output conversion from RGB->YCBCR. So if CTM is already
                 * applied we can't support YCBCR420 output.
                 */
                DRM_DEBUG_KMS("YCBCR420 and CTM together are not possible\n");
                return -EINVAL;
        }

        /*
         * Pipe horizontal size must be even in:
         * - DVO ganged mode
         * - LVDS dual channel mode
         * - Double wide pipe
         */
        if (pipe_config->pipe_src_w & 1) {
                if (pipe_config->double_wide) {
                        DRM_DEBUG_KMS("Odd pipe source width not supported with double wide pipe\n");
                        return -EINVAL;
                }

                if (intel_crtc_has_type(pipe_config, INTEL_OUTPUT_LVDS) &&
                    intel_is_dual_link_lvds(dev)) {
                        DRM_DEBUG_KMS("Odd pipe source width not supported with dual link LVDS\n");
                        return -EINVAL;
                }
        }

        /* Cantiga+ cannot handle modes with a hsync front porch of 0.
         * WaPruneModeWithIncorrectHsyncOffset:ctg,elk,ilk,snb,ivb,vlv,hsw.
         */
        if ((INTEL_GEN(dev_priv) > 4 || IS_G4X(dev_priv)) &&
                adjusted_mode->crtc_hsync_start == adjusted_mode->crtc_hdisplay)
                return -EINVAL;

        intel_crtc_compute_pixel_rate(pipe_config);

        if (pipe_config->has_pch_encoder)
                return ironlake_fdi_compute_config(crtc, pipe_config);

        return 0;
}

static void
intel_reduce_m_n_ratio(uint32_t *num, uint32_t *den)
{
        while (*num > DATA_LINK_M_N_MASK ||
               *den > DATA_LINK_M_N_MASK) {
                *num >>= 1;
                *den >>= 1;
        }
}

static void compute_m_n(unsigned int m, unsigned int n,
                        uint32_t *ret_m, uint32_t *ret_n,
                        bool constant_n)
{
        /*
         * Several DP dongles in particular seem to be fussy about
         * too large link M/N values. Give N value as 0x8000 that
         * should be acceptable by specific devices. 0x8000 is the
         * specified fixed N value for asynchronous clock mode,
         * which the devices expect also in synchronous clock mode.
         */
        if (constant_n)
                *ret_n = 0x8000;
        else
                *ret_n = min_t(unsigned int, roundup_pow_of_two(n), DATA_LINK_N_MAX);

        *ret_m = div_u64((uint64_t) m * *ret_n, n);
        intel_reduce_m_n_ratio(ret_m, ret_n);
}

void
intel_link_compute_m_n(int bits_per_pixel, int nlanes,
                       int pixel_clock, int link_clock,
                       struct intel_link_m_n *m_n,
                       bool constant_n)
{
        m_n->tu = 64;

        compute_m_n(bits_per_pixel * pixel_clock,
                    link_clock * nlanes * 8,
                    &m_n->gmch_m, &m_n->gmch_n,
                    constant_n);

        compute_m_n(pixel_clock, link_clock,
                    &m_n->link_m, &m_n->link_n,
                    constant_n);
}

static inline bool intel_panel_use_ssc(struct drm_i915_private *dev_priv)
{
        if (i915_modparams.panel_use_ssc >= 0)
                return i915_modparams.panel_use_ssc != 0;
        return dev_priv->vbt.lvds_use_ssc
                && !(dev_priv->quirks & QUIRK_LVDS_SSC_DISABLE);
}

static uint32_t pnv_dpll_compute_fp(struct dpll *dpll)
{
        return (1 << dpll->n) << 16 | dpll->m2;
}

static uint32_t i9xx_dpll_compute_fp(struct dpll *dpll)
{
        return dpll->n << 16 | dpll->m1 << 8 | dpll->m2;
}

static void i9xx_update_pll_dividers(struct intel_crtc *crtc,
                                     struct intel_crtc_state *crtc_state,
                                     struct dpll *reduced_clock)
{
        struct drm_i915_private *dev_priv = to_i915(crtc->base.dev);
        u32 fp, fp2 = 0;

        if (IS_PINEVIEW(dev_priv)) {
                fp = pnv_dpll_compute_fp(&crtc_state->dpll);
                if (reduced_clock)
                        fp2 = pnv_dpll_compute_fp(reduced_clock);
        } else {
                fp = i9xx_dpll_compute_fp(&crtc_state->dpll);
                if (reduced_clock)
                        fp2 = i9xx_dpll_compute_fp(reduced_clock);
        }

        crtc_state->dpll_hw_state.fp0 = fp;

        if (intel_crtc_has_type(crtc_state, INTEL_OUTPUT_LVDS) &&
            reduced_clock) {
                crtc_state->dpll_hw_state.fp1 = fp2;
        } else {
                crtc_state->dpll_hw_state.fp1 = fp;
        }
}

static void vlv_pllb_recal_opamp(struct drm_i915_private *dev_priv, enum i915_pipe
                pipe)
{
        u32 reg_val;

        /*
         * PLLB opamp always calibrates to max value of 0x3f, force enable it
         * and set it to a reasonable value instead.
         */
        reg_val = vlv_dpio_read(dev_priv, pipe, VLV_PLL_DW9(1));
        reg_val &= 0xffffff00;
        reg_val |= 0x00000030;
        vlv_dpio_write(dev_priv, pipe, VLV_PLL_DW9(1), reg_val);

        reg_val = vlv_dpio_read(dev_priv, pipe, VLV_REF_DW13);
        reg_val &= 0x00ffffff;
        reg_val |= 0x8c000000;
        vlv_dpio_write(dev_priv, pipe, VLV_REF_DW13, reg_val);

        reg_val = vlv_dpio_read(dev_priv, pipe, VLV_PLL_DW9(1));
        reg_val &= 0xffffff00;
        vlv_dpio_write(dev_priv, pipe, VLV_PLL_DW9(1), reg_val);

        reg_val = vlv_dpio_read(dev_priv, pipe, VLV_REF_DW13);
        reg_val &= 0x00ffffff;
        reg_val |= 0xb0000000;
        vlv_dpio_write(dev_priv, pipe, VLV_REF_DW13, reg_val);
}

static void intel_pch_transcoder_set_m_n(struct intel_crtc *crtc,
                                         struct intel_link_m_n *m_n)
{
        struct drm_device *dev = crtc->base.dev;
        struct drm_i915_private *dev_priv = to_i915(dev);
        int pipe = crtc->pipe;

        I915_WRITE(PCH_TRANS_DATA_M1(pipe), TU_SIZE(m_n->tu) | m_n->gmch_m);
        I915_WRITE(PCH_TRANS_DATA_N1(pipe), m_n->gmch_n);
        I915_WRITE(PCH_TRANS_LINK_M1(pipe), m_n->link_m);
        I915_WRITE(PCH_TRANS_LINK_N1(pipe), m_n->link_n);
}

static void intel_cpu_transcoder_set_m_n(struct intel_crtc *crtc,
                                         struct intel_link_m_n *m_n,
                                         struct intel_link_m_n *m2_n2)
{
        struct drm_i915_private *dev_priv = to_i915(crtc->base.dev);
        int pipe = crtc->pipe;
        enum transcoder transcoder = crtc->config->cpu_transcoder;

        if (INTEL_GEN(dev_priv) >= 5) {
                I915_WRITE(PIPE_DATA_M1(transcoder), TU_SIZE(m_n->tu) | m_n->gmch_m);
                I915_WRITE(PIPE_DATA_N1(transcoder), m_n->gmch_n);
                I915_WRITE(PIPE_LINK_M1(transcoder), m_n->link_m);
                I915_WRITE(PIPE_LINK_N1(transcoder), m_n->link_n);
                /* M2_N2 registers to be set only for gen < 8 (M2_N2 available
                 * for gen < 8) and if DRRS is supported (to make sure the
                 * registers are not unnecessarily accessed).
                 */
                if (m2_n2 && (IS_CHERRYVIEW(dev_priv) ||
                    INTEL_GEN(dev_priv) < 8) && crtc->config->has_drrs) {
                        I915_WRITE(PIPE_DATA_M2(transcoder),
                                        TU_SIZE(m2_n2->tu) | m2_n2->gmch_m);
                        I915_WRITE(PIPE_DATA_N2(transcoder), m2_n2->gmch_n);
                        I915_WRITE(PIPE_LINK_M2(transcoder), m2_n2->link_m);
                        I915_WRITE(PIPE_LINK_N2(transcoder), m2_n2->link_n);
                }
        } else {
                I915_WRITE(PIPE_DATA_M_G4X(pipe), TU_SIZE(m_n->tu) | m_n->gmch_m);
                I915_WRITE(PIPE_DATA_N_G4X(pipe), m_n->gmch_n);
                I915_WRITE(PIPE_LINK_M_G4X(pipe), m_n->link_m);
                I915_WRITE(PIPE_LINK_N_G4X(pipe), m_n->link_n);
        }
}

void intel_dp_set_m_n(struct intel_crtc *crtc, enum link_m_n_set m_n)
{
        struct intel_link_m_n *dp_m_n, *dp_m2_n2 = NULL;

        if (m_n == M1_N1) {
                dp_m_n = &crtc->config->dp_m_n;
                dp_m2_n2 = &crtc->config->dp_m2_n2;
        } else if (m_n == M2_N2) {

                /*
                 * M2_N2 registers are not supported. Hence m2_n2 divider value
                 * needs to be programmed into M1_N1.
                 */
                dp_m_n = &crtc->config->dp_m2_n2;
        } else {
                DRM_ERROR("Unsupported divider value\n");
                return;
        }

        if (crtc->config->has_pch_encoder)
                intel_pch_transcoder_set_m_n(crtc, &crtc->config->dp_m_n);
        else
                intel_cpu_transcoder_set_m_n(crtc, dp_m_n, dp_m2_n2);
}

static void vlv_compute_dpll(struct intel_crtc *crtc,
                             struct intel_crtc_state *pipe_config)
{
        pipe_config->dpll_hw_state.dpll = DPLL_INTEGRATED_REF_CLK_VLV |
                DPLL_REF_CLK_ENABLE_VLV | DPLL_VGA_MODE_DIS;
        if (crtc->pipe != PIPE_A)
                pipe_config->dpll_hw_state.dpll |= DPLL_INTEGRATED_CRI_CLK_VLV;

        /* DPLL not used with DSI, but still need the rest set up */
        if (!intel_crtc_has_type(pipe_config, INTEL_OUTPUT_DSI))
                pipe_config->dpll_hw_state.dpll |= DPLL_VCO_ENABLE |
                        DPLL_EXT_BUFFER_ENABLE_VLV;

        pipe_config->dpll_hw_state.dpll_md =
                (pipe_config->pixel_multiplier - 1) << DPLL_MD_UDI_MULTIPLIER_SHIFT;
}

static void chv_compute_dpll(struct intel_crtc *crtc,
                             struct intel_crtc_state *pipe_config)
{
        pipe_config->dpll_hw_state.dpll = DPLL_SSC_REF_CLK_CHV |
                DPLL_REF_CLK_ENABLE_VLV | DPLL_VGA_MODE_DIS;
        if (crtc->pipe != PIPE_A)
                pipe_config->dpll_hw_state.dpll |= DPLL_INTEGRATED_CRI_CLK_VLV;

        /* DPLL not used with DSI, but still need the rest set up */
        if (!intel_crtc_has_type(pipe_config, INTEL_OUTPUT_DSI))
                pipe_config->dpll_hw_state.dpll |= DPLL_VCO_ENABLE;

        pipe_config->dpll_hw_state.dpll_md =
                (pipe_config->pixel_multiplier - 1) << DPLL_MD_UDI_MULTIPLIER_SHIFT;
}

static void vlv_prepare_pll(struct intel_crtc *crtc,
                            const struct intel_crtc_state *pipe_config)
{
        struct drm_device *dev = crtc->base.dev;
        struct drm_i915_private *dev_priv = to_i915(dev);
        enum i915_pipe pipe = crtc->pipe;
        u32 mdiv;
        u32 bestn, bestm1, bestm2, bestp1, bestp2;
        u32 coreclk, reg_val;

        /* Enable Refclk */
        I915_WRITE(DPLL(pipe),
                   pipe_config->dpll_hw_state.dpll &
                   ~(DPLL_VCO_ENABLE | DPLL_EXT_BUFFER_ENABLE_VLV));

        /* No need to actually set up the DPLL with DSI */
        if ((pipe_config->dpll_hw_state.dpll & DPLL_VCO_ENABLE) == 0)
                return;

        mutex_lock(&dev_priv->sb_lock);

        bestn = pipe_config->dpll.n;
        bestm1 = pipe_config->dpll.m1;
        bestm2 = pipe_config->dpll.m2;
        bestp1 = pipe_config->dpll.p1;
        bestp2 = pipe_config->dpll.p2;

        /* See eDP HDMI DPIO driver vbios notes doc */

        /* PLL B needs special handling */
        if (pipe == PIPE_B)
                vlv_pllb_recal_opamp(dev_priv, pipe);

        /* Set up Tx target for periodic Rcomp update */
        vlv_dpio_write(dev_priv, pipe, VLV_PLL_DW9_BCAST, 0x0100000f);

        /* Disable target IRef on PLL */
        reg_val = vlv_dpio_read(dev_priv, pipe, VLV_PLL_DW8(pipe));
        reg_val &= 0x00ffffff;
        vlv_dpio_write(dev_priv, pipe, VLV_PLL_DW8(pipe), reg_val);

        /* Disable fast lock */
        vlv_dpio_write(dev_priv, pipe, VLV_CMN_DW0, 0x610);

        /* Set idtafcrecal before PLL is enabled */
        mdiv = ((bestm1 << DPIO_M1DIV_SHIFT) | (bestm2 & DPIO_M2DIV_MASK));
        mdiv |= ((bestp1 << DPIO_P1_SHIFT) | (bestp2 << DPIO_P2_SHIFT));
        mdiv |= ((bestn << DPIO_N_SHIFT));
        mdiv |= (1 << DPIO_K_SHIFT);

        /*
         * Post divider depends on pixel clock rate, DAC vs digital (and LVDS,
         * but we don't support that).
         * Note: don't use the DAC post divider as it seems unstable.
         */
        mdiv |= (DPIO_POST_DIV_HDMIDP << DPIO_POST_DIV_SHIFT);
        vlv_dpio_write(dev_priv, pipe, VLV_PLL_DW3(pipe), mdiv);

        mdiv |= DPIO_ENABLE_CALIBRATION;
        vlv_dpio_write(dev_priv, pipe, VLV_PLL_DW3(pipe), mdiv);

        /* Set HBR and RBR LPF coefficients */
        if (pipe_config->port_clock == 162000 ||
            intel_crtc_has_type(crtc->config, INTEL_OUTPUT_ANALOG) ||
            intel_crtc_has_type(crtc->config, INTEL_OUTPUT_HDMI))
                vlv_dpio_write(dev_priv, pipe, VLV_PLL_DW10(pipe),
                                 0x009f0003);
        else
                vlv_dpio_write(dev_priv, pipe, VLV_PLL_DW10(pipe),
                                 0x00d0000f);

        if (intel_crtc_has_dp_encoder(pipe_config)) {
                /* Use SSC source */
                if (pipe == PIPE_A)
                        vlv_dpio_write(dev_priv, pipe, VLV_PLL_DW5(pipe),
                                         0x0df40000);
                else
                        vlv_dpio_write(dev_priv, pipe, VLV_PLL_DW5(pipe),
                                         0x0df70000);
        } else { /* HDMI or VGA */
                /* Use bend source */
                if (pipe == PIPE_A)
                        vlv_dpio_write(dev_priv, pipe, VLV_PLL_DW5(pipe),
                                         0x0df70000);
                else
                        vlv_dpio_write(dev_priv, pipe, VLV_PLL_DW5(pipe),
                                         0x0df40000);
        }

        coreclk = vlv_dpio_read(dev_priv, pipe, VLV_PLL_DW7(pipe));
        coreclk = (coreclk & 0x0000ff00) | 0x01c00000;
        if (intel_crtc_has_dp_encoder(crtc->config))
                coreclk |= 0x01000000;
        vlv_dpio_write(dev_priv, pipe, VLV_PLL_DW7(pipe), coreclk);

        vlv_dpio_write(dev_priv, pipe, VLV_PLL_DW11(pipe), 0x87871000);
        mutex_unlock(&dev_priv->sb_lock);
}

static void chv_prepare_pll(struct intel_crtc *crtc,
                            const struct intel_crtc_state *pipe_config)
{
        struct drm_device *dev = crtc->base.dev;
        struct drm_i915_private *dev_priv = to_i915(dev);
        enum i915_pipe pipe = crtc->pipe;
        enum dpio_channel port = vlv_pipe_to_channel(pipe);
        u32 loopfilter, tribuf_calcntr;
        u32 bestn, bestm1, bestm2, bestp1, bestp2, bestm2_frac;
        u32 dpio_val;
        int vco;

        /* Enable Refclk and SSC */
        I915_WRITE(DPLL(pipe),
                   pipe_config->dpll_hw_state.dpll & ~DPLL_VCO_ENABLE);

        /* No need to actually set up the DPLL with DSI */
        if ((pipe_config->dpll_hw_state.dpll & DPLL_VCO_ENABLE) == 0)
                return;

        bestn = pipe_config->dpll.n;
        bestm2_frac = pipe_config->dpll.m2 & 0x3fffff;
        bestm1 = pipe_config->dpll.m1;
        bestm2 = pipe_config->dpll.m2 >> 22;
        bestp1 = pipe_config->dpll.p1;
        bestp2 = pipe_config->dpll.p2;
        vco = pipe_config->dpll.vco;
        dpio_val = 0;
        loopfilter = 0;

        mutex_lock(&dev_priv->sb_lock);

        /* p1 and p2 divider */
        vlv_dpio_write(dev_priv, pipe, CHV_CMN_DW13(port),
                        5 << DPIO_CHV_S1_DIV_SHIFT |
                        bestp1 << DPIO_CHV_P1_DIV_SHIFT |
                        bestp2 << DPIO_CHV_P2_DIV_SHIFT |
                        1 << DPIO_CHV_K_DIV_SHIFT);

        /* Feedback post-divider - m2 */
        vlv_dpio_write(dev_priv, pipe, CHV_PLL_DW0(port), bestm2);

        /* Feedback refclk divider - n and m1 */
        vlv_dpio_write(dev_priv, pipe, CHV_PLL_DW1(port),
                        DPIO_CHV_M1_DIV_BY_2 |
                        1 << DPIO_CHV_N_DIV_SHIFT);

        /* M2 fraction division */
        vlv_dpio_write(dev_priv, pipe, CHV_PLL_DW2(port), bestm2_frac);

        /* M2 fraction division enable */
        dpio_val = vlv_dpio_read(dev_priv, pipe, CHV_PLL_DW3(port));
        dpio_val &= ~(DPIO_CHV_FEEDFWD_GAIN_MASK | DPIO_CHV_FRAC_DIV_EN);
        dpio_val |= (2 << DPIO_CHV_FEEDFWD_GAIN_SHIFT);
        if (bestm2_frac)
                dpio_val |= DPIO_CHV_FRAC_DIV_EN;
        vlv_dpio_write(dev_priv, pipe, CHV_PLL_DW3(port), dpio_val);

        /* Program digital lock detect threshold */
        dpio_val = vlv_dpio_read(dev_priv, pipe, CHV_PLL_DW9(port));
        dpio_val &= ~(DPIO_CHV_INT_LOCK_THRESHOLD_MASK |
                                        DPIO_CHV_INT_LOCK_THRESHOLD_SEL_COARSE);
        dpio_val |= (0x5 << DPIO_CHV_INT_LOCK_THRESHOLD_SHIFT);
        if (!bestm2_frac)
                dpio_val |= DPIO_CHV_INT_LOCK_THRESHOLD_SEL_COARSE;
        vlv_dpio_write(dev_priv, pipe, CHV_PLL_DW9(port), dpio_val);

        /* Loop filter */
        if (vco == 5400000) {
                loopfilter |= (0x3 << DPIO_CHV_PROP_COEFF_SHIFT);
                loopfilter |= (0x8 << DPIO_CHV_INT_COEFF_SHIFT);
                loopfilter |= (0x1 << DPIO_CHV_GAIN_CTRL_SHIFT);
                tribuf_calcntr = 0x9;
        } else if (vco <= 6200000) {
                loopfilter |= (0x5 << DPIO_CHV_PROP_COEFF_SHIFT);
                loopfilter |= (0xB << DPIO_CHV_INT_COEFF_SHIFT);
                loopfilter |= (0x3 << DPIO_CHV_GAIN_CTRL_SHIFT);
                tribuf_calcntr = 0x9;
        } else if (vco <= 6480000) {
                loopfilter |= (0x4 << DPIO_CHV_PROP_COEFF_SHIFT);
                loopfilter |= (0x9 << DPIO_CHV_INT_COEFF_SHIFT);
                loopfilter |= (0x3 << DPIO_CHV_GAIN_CTRL_SHIFT);
                tribuf_calcntr = 0x8;
        } else {
                /* Not supported. Apply the same limits as in the max case */
                loopfilter |= (0x4 << DPIO_CHV_PROP_COEFF_SHIFT);
                loopfilter |= (0x9 << DPIO_CHV_INT_COEFF_SHIFT);
                loopfilter |= (0x3 << DPIO_CHV_GAIN_CTRL_SHIFT);
                tribuf_calcntr = 0;
        }
        vlv_dpio_write(dev_priv, pipe, CHV_PLL_DW6(port), loopfilter);

        dpio_val = vlv_dpio_read(dev_priv, pipe, CHV_PLL_DW8(port));
        dpio_val &= ~DPIO_CHV_TDC_TARGET_CNT_MASK;
        dpio_val |= (tribuf_calcntr << DPIO_CHV_TDC_TARGET_CNT_SHIFT);
        vlv_dpio_write(dev_priv, pipe, CHV_PLL_DW8(port), dpio_val);

        /* AFC Recal */
        vlv_dpio_write(dev_priv, pipe, CHV_CMN_DW14(port),
                        vlv_dpio_read(dev_priv, pipe, CHV_CMN_DW14(port)) |
                        DPIO_AFC_RECAL);

        mutex_unlock(&dev_priv->sb_lock);
}

/**
 * vlv_force_pll_on - forcibly enable just the PLL
 * @dev_priv: i915 private structure
 * @pipe: pipe PLL to enable
 * @dpll: PLL configuration
 *
 * Enable the PLL for @pipe using the supplied @dpll config. To be used
 * in cases where we need the PLL enabled even when @pipe is not going to
 * be enabled.
 */
int vlv_force_pll_on(struct drm_i915_private *dev_priv, enum i915_pipe pipe,
                     const struct dpll *dpll)
{
        struct intel_crtc *crtc = intel_get_crtc_for_pipe(dev_priv, pipe);
        struct intel_crtc_state *pipe_config;

        pipe_config = kzalloc(sizeof(*pipe_config), GFP_KERNEL);
        if (!pipe_config)
                return -ENOMEM;

        pipe_config->base.crtc = &crtc->base;
        pipe_config->pixel_multiplier = 1;
        pipe_config->dpll = *dpll;

        if (IS_CHERRYVIEW(dev_priv)) {
                chv_compute_dpll(crtc, pipe_config);
                chv_prepare_pll(crtc, pipe_config);
                chv_enable_pll(crtc, pipe_config);
        } else {
                vlv_compute_dpll(crtc, pipe_config);
                vlv_prepare_pll(crtc, pipe_config);
                vlv_enable_pll(crtc, pipe_config);
        }

        kfree(pipe_config);

        return 0;
}

/**
 * vlv_force_pll_off - forcibly disable just the PLL
 * @dev_priv: i915 private structure
 * @pipe: pipe PLL to disable
 *
 * Disable the PLL for @pipe. To be used in cases where we need
 * the PLL enabled even when @pipe is not going to be enabled.
 */
void vlv_force_pll_off(struct drm_i915_private *dev_priv, enum i915_pipe pipe)
{
        if (IS_CHERRYVIEW(dev_priv))
                chv_disable_pll(dev_priv, pipe);
        else
                vlv_disable_pll(dev_priv, pipe);
}

static void i9xx_compute_dpll(struct intel_crtc *crtc,
                              struct intel_crtc_state *crtc_state,
                              struct dpll *reduced_clock)
{
        struct drm_i915_private *dev_priv = to_i915(crtc->base.dev);
        u32 dpll;
        struct dpll *clock = &crtc_state->dpll;

        i9xx_update_pll_dividers(crtc, crtc_state, reduced_clock);

        dpll = DPLL_VGA_MODE_DIS;

        if (intel_crtc_has_type(crtc_state, INTEL_OUTPUT_LVDS))
                dpll |= DPLLB_MODE_LVDS;
        else
                dpll |= DPLLB_MODE_DAC_SERIAL;

        if (IS_I945G(dev_priv) || IS_I945GM(dev_priv) ||
            IS_G33(dev_priv) || IS_PINEVIEW(dev_priv)) {
                dpll |= (crtc_state->pixel_multiplier - 1)
                        << SDVO_MULTIPLIER_SHIFT_HIRES;
        }

        if (intel_crtc_has_type(crtc_state, INTEL_OUTPUT_SDVO) ||
            intel_crtc_has_type(crtc_state, INTEL_OUTPUT_HDMI))
                dpll |= DPLL_SDVO_HIGH_SPEED;

        if (intel_crtc_has_dp_encoder(crtc_state))
                dpll |= DPLL_SDVO_HIGH_SPEED;

        /* compute bitmask from p1 value */
        if (IS_PINEVIEW(dev_priv))
                dpll |= (1 << (clock->p1 - 1)) << DPLL_FPA01_P1_POST_DIV_SHIFT_PINEVIEW;
        else {
                dpll |= (1 << (clock->p1 - 1)) << DPLL_FPA01_P1_POST_DIV_SHIFT;
                if (IS_G4X(dev_priv) && reduced_clock)
                        dpll |= (1 << (reduced_clock->p1 - 1)) << DPLL_FPA1_P1_POST_DIV_SHIFT;
        }
        switch (clock->p2) {
        case 5:
                dpll |= DPLL_DAC_SERIAL_P2_CLOCK_DIV_5;
                break;
        case 7:
                dpll |= DPLLB_LVDS_P2_CLOCK_DIV_7;
                break;
        case 10:
                dpll |= DPLL_DAC_SERIAL_P2_CLOCK_DIV_10;
                break;
        case 14:
                dpll |= DPLLB_LVDS_P2_CLOCK_DIV_14;
                break;
        }
        if (INTEL_GEN(dev_priv) >= 4)
                dpll |= (6 << PLL_LOAD_PULSE_PHASE_SHIFT);

        if (crtc_state->sdvo_tv_clock)
                dpll |= PLL_REF_INPUT_TVCLKINBC;
        else if (intel_crtc_has_type(crtc_state, INTEL_OUTPUT_LVDS) &&
                 intel_panel_use_ssc(dev_priv))
                dpll |= PLLB_REF_INPUT_SPREADSPECTRUMIN;
        else
                dpll |= PLL_REF_INPUT_DREFCLK;

        dpll |= DPLL_VCO_ENABLE;
        crtc_state->dpll_hw_state.dpll = dpll;

        if (INTEL_GEN(dev_priv) >= 4) {
                u32 dpll_md = (crtc_state->pixel_multiplier - 1)
                        << DPLL_MD_UDI_MULTIPLIER_SHIFT;
                crtc_state->dpll_hw_state.dpll_md = dpll_md;
        }
}

static void i8xx_compute_dpll(struct intel_crtc *crtc,
                              struct intel_crtc_state *crtc_state,
                              struct dpll *reduced_clock)
{
        struct drm_device *dev = crtc->base.dev;
        struct drm_i915_private *dev_priv = to_i915(dev);
        u32 dpll;
        struct dpll *clock = &crtc_state->dpll;

        i9xx_update_pll_dividers(crtc, crtc_state, reduced_clock);

        dpll = DPLL_VGA_MODE_DIS;

        if (intel_crtc_has_type(crtc_state, INTEL_OUTPUT_LVDS)) {
                dpll |= (1 << (clock->p1 - 1)) << DPLL_FPA01_P1_POST_DIV_SHIFT;
        } else {
                if (clock->p1 == 2)
                        dpll |= PLL_P1_DIVIDE_BY_TWO;
                else
                        dpll |= (clock->p1 - 2) << DPLL_FPA01_P1_POST_DIV_SHIFT;
                if (clock->p2 == 4)
                        dpll |= PLL_P2_DIVIDE_BY_4;
        }

        if (!IS_I830(dev_priv) &&
            intel_crtc_has_type(crtc_state, INTEL_OUTPUT_DVO))
                dpll |= DPLL_DVO_2X_MODE;

        if (intel_crtc_has_type(crtc_state, INTEL_OUTPUT_LVDS) &&
            intel_panel_use_ssc(dev_priv))
                dpll |= PLLB_REF_INPUT_SPREADSPECTRUMIN;
        else
                dpll |= PLL_REF_INPUT_DREFCLK;

        dpll |= DPLL_VCO_ENABLE;
        crtc_state->dpll_hw_state.dpll = dpll;
}

static void intel_set_pipe_timings(struct intel_crtc *intel_crtc)
{
        struct drm_i915_private *dev_priv = to_i915(intel_crtc->base.dev);
        enum i915_pipe pipe = intel_crtc->pipe;
        enum transcoder cpu_transcoder = intel_crtc->config->cpu_transcoder;
        const struct drm_display_mode *adjusted_mode = &intel_crtc->config->base.adjusted_mode;
        uint32_t crtc_vtotal, crtc_vblank_end;
        int vsyncshift = 0;

        /* We need to be careful not to changed the adjusted mode, for otherwise
         * the hw state checker will get angry at the mismatch. */
        crtc_vtotal = adjusted_mode->crtc_vtotal;
        crtc_vblank_end = adjusted_mode->crtc_vblank_end;

        if (adjusted_mode->flags & DRM_MODE_FLAG_INTERLACE) {
                /* the chip adds 2 halflines automatically */
                crtc_vtotal -= 1;
                crtc_vblank_end -= 1;

                if (intel_crtc_has_type(intel_crtc->config, INTEL_OUTPUT_SDVO))
                        vsyncshift = (adjusted_mode->crtc_htotal - 1) / 2;
                else
                        vsyncshift = adjusted_mode->crtc_hsync_start -
                                adjusted_mode->crtc_htotal / 2;
                if (vsyncshift < 0)
                        vsyncshift += adjusted_mode->crtc_htotal;
        }

        if (INTEL_GEN(dev_priv) > 3)
                I915_WRITE(VSYNCSHIFT(cpu_transcoder), vsyncshift);

        I915_WRITE(HTOTAL(cpu_transcoder),
                   (adjusted_mode->crtc_hdisplay - 1) |
                   ((adjusted_mode->crtc_htotal - 1) << 16));
        I915_WRITE(HBLANK(cpu_transcoder),
                   (adjusted_mode->crtc_hblank_start - 1) |
                   ((adjusted_mode->crtc_hblank_end - 1) << 16));
        I915_WRITE(HSYNC(cpu_transcoder),
                   (adjusted_mode->crtc_hsync_start - 1) |
                   ((adjusted_mode->crtc_hsync_end - 1) << 16));

        I915_WRITE(VTOTAL(cpu_transcoder),
                   (adjusted_mode->crtc_vdisplay - 1) |
                   ((crtc_vtotal - 1) << 16));
        I915_WRITE(VBLANK(cpu_transcoder),
                   (adjusted_mode->crtc_vblank_start - 1) |
                   ((crtc_vblank_end - 1) << 16));
        I915_WRITE(VSYNC(cpu_transcoder),
                   (adjusted_mode->crtc_vsync_start - 1) |
                   ((adjusted_mode->crtc_vsync_end - 1) << 16));

        /* Workaround: when the EDP input selection is B, the VTOTAL_B must be
         * programmed with the VTOTAL_EDP value. Same for VTOTAL_C. This is
         * documented on the DDI_FUNC_CTL register description, EDP Input Select
         * bits. */
        if (IS_HASWELL(dev_priv) && cpu_transcoder == TRANSCODER_EDP &&
            (pipe == PIPE_B || pipe == PIPE_C))
                I915_WRITE(VTOTAL(pipe), I915_READ(VTOTAL(cpu_transcoder)));

}

static void intel_set_pipe_src_size(struct intel_crtc *intel_crtc)
{
        struct drm_device *dev = intel_crtc->base.dev;
        struct drm_i915_private *dev_priv = to_i915(dev);
        enum i915_pipe pipe = intel_crtc->pipe;

        /* pipesrc controls the size that is scaled from, which should
         * always be the user's requested size.
         */
        I915_WRITE(PIPESRC(pipe),
                   ((intel_crtc->config->pipe_src_w - 1) << 16) |
                   (intel_crtc->config->pipe_src_h - 1));
}

static void intel_get_pipe_timings(struct intel_crtc *crtc,
                                   struct intel_crtc_state *pipe_config)
{
        struct drm_device *dev = crtc->base.dev;
        struct drm_i915_private *dev_priv = to_i915(dev);
        enum transcoder cpu_transcoder = pipe_config->cpu_transcoder;
        uint32_t tmp;

        tmp = I915_READ(HTOTAL(cpu_transcoder));
        pipe_config->base.adjusted_mode.crtc_hdisplay = (tmp & 0xffff) + 1;
        pipe_config->base.adjusted_mode.crtc_htotal = ((tmp >> 16) & 0xffff) + 1;
        tmp = I915_READ(HBLANK(cpu_transcoder));
        pipe_config->base.adjusted_mode.crtc_hblank_start = (tmp & 0xffff) + 1;
        pipe_config->base.adjusted_mode.crtc_hblank_end = ((tmp >> 16) & 0xffff) + 1;
        tmp = I915_READ(HSYNC(cpu_transcoder));
        pipe_config->base.adjusted_mode.crtc_hsync_start = (tmp & 0xffff) + 1;
        pipe_config->base.adjusted_mode.crtc_hsync_end = ((tmp >> 16) & 0xffff) + 1;

        tmp = I915_READ(VTOTAL(cpu_transcoder));
        pipe_config->base.adjusted_mode.crtc_vdisplay = (tmp & 0xffff) + 1;
        pipe_config->base.adjusted_mode.crtc_vtotal = ((tmp >> 16) & 0xffff) + 1;
        tmp = I915_READ(VBLANK(cpu_transcoder));
        pipe_config->base.adjusted_mode.crtc_vblank_start = (tmp & 0xffff) + 1;
        pipe_config->base.adjusted_mode.crtc_vblank_end = ((tmp >> 16) & 0xffff) + 1;
        tmp = I915_READ(VSYNC(cpu_transcoder));
        pipe_config->base.adjusted_mode.crtc_vsync_start = (tmp & 0xffff) + 1;
        pipe_config->base.adjusted_mode.crtc_vsync_end = ((tmp >> 16) & 0xffff) + 1;

        if (I915_READ(PIPECONF(cpu_transcoder)) & PIPECONF_INTERLACE_MASK) {
                pipe_config->base.adjusted_mode.flags |= DRM_MODE_FLAG_INTERLACE;
                pipe_config->base.adjusted_mode.crtc_vtotal += 1;
                pipe_config->base.adjusted_mode.crtc_vblank_end += 1;
        }
}

static void intel_get_pipe_src_size(struct intel_crtc *crtc,
                                    struct intel_crtc_state *pipe_config)
{
        struct drm_device *dev = crtc->base.dev;
        struct drm_i915_private *dev_priv = to_i915(dev);
        u32 tmp;

        tmp = I915_READ(PIPESRC(crtc->pipe));
        pipe_config->pipe_src_h = (tmp & 0xffff) + 1;
        pipe_config->pipe_src_w = ((tmp >> 16) & 0xffff) + 1;

        pipe_config->base.mode.vdisplay = pipe_config->pipe_src_h;
        pipe_config->base.mode.hdisplay = pipe_config->pipe_src_w;
}

void intel_mode_from_pipe_config(struct drm_display_mode *mode,
                                 struct intel_crtc_state *pipe_config)
{
        mode->hdisplay = pipe_config->base.adjusted_mode.crtc_hdisplay;
        mode->htotal = pipe_config->base.adjusted_mode.crtc_htotal;
        mode->hsync_start = pipe_config->base.adjusted_mode.crtc_hsync_start;
        mode->hsync_end = pipe_config->base.adjusted_mode.crtc_hsync_end;

        mode->vdisplay = pipe_config->base.adjusted_mode.crtc_vdisplay;
        mode->vtotal = pipe_config->base.adjusted_mode.crtc_vtotal;
        mode->vsync_start = pipe_config->base.adjusted_mode.crtc_vsync_start;
        mode->vsync_end = pipe_config->base.adjusted_mode.crtc_vsync_end;

        mode->flags = pipe_config->base.adjusted_mode.flags;
        mode->type = DRM_MODE_TYPE_DRIVER;

        mode->clock = pipe_config->base.adjusted_mode.crtc_clock;

        mode->hsync = drm_mode_hsync(mode);
        mode->vrefresh = drm_mode_vrefresh(mode);
        drm_mode_set_name(mode);
}

static void i9xx_set_pipeconf(struct intel_crtc *intel_crtc)
{
        struct drm_i915_private *dev_priv = to_i915(intel_crtc->base.dev);
        uint32_t pipeconf;

        pipeconf = 0;

        /* we keep both pipes enabled on 830 */
        if (IS_I830(dev_priv))
                pipeconf |= I915_READ(PIPECONF(intel_crtc->pipe)) & PIPECONF_ENABLE;

        if (intel_crtc->config->double_wide)
                pipeconf |= PIPECONF_DOUBLE_WIDE;

        /* only g4x and later have fancy bpc/dither controls */
        if (IS_G4X(dev_priv) || IS_VALLEYVIEW(dev_priv) ||
            IS_CHERRYVIEW(dev_priv)) {
                /* Bspec claims that we can't use dithering for 30bpp pipes. */
                if (intel_crtc->config->dither && intel_crtc->config->pipe_bpp != 30)
                        pipeconf |= PIPECONF_DITHER_EN |
                                    PIPECONF_DITHER_TYPE_SP;

                switch (intel_crtc->config->pipe_bpp) {
                case 18:
                        pipeconf |= PIPECONF_6BPC;
                        break;
                case 24:
                        pipeconf |= PIPECONF_8BPC;
                        break;
                case 30:
                        pipeconf |= PIPECONF_10BPC;
                        break;
                default:
                        /* Case prevented by intel_choose_pipe_bpp_dither. */
                        BUG();
                }
        }

        if (intel_crtc->config->base.adjusted_mode.flags & DRM_MODE_FLAG_INTERLACE) {
                if (INTEL_GEN(dev_priv) < 4 ||
                    intel_crtc_has_type(intel_crtc->config, INTEL_OUTPUT_SDVO))
                        pipeconf |= PIPECONF_INTERLACE_W_FIELD_INDICATION;
                else
                        pipeconf |= PIPECONF_INTERLACE_W_SYNC_SHIFT;
        } else
                pipeconf |= PIPECONF_PROGRESSIVE;

        if ((IS_VALLEYVIEW(dev_priv) || IS_CHERRYVIEW(dev_priv)) &&
             intel_crtc->config->limited_color_range)
                pipeconf |= PIPECONF_COLOR_RANGE_SELECT;

        I915_WRITE(PIPECONF(intel_crtc->pipe), pipeconf);
        POSTING_READ(PIPECONF(intel_crtc->pipe));
}

static int i8xx_crtc_compute_clock(struct intel_crtc *crtc,
                                   struct intel_crtc_state *crtc_state)
{
        struct drm_device *dev = crtc->base.dev;
        struct drm_i915_private *dev_priv = to_i915(dev);
        const struct intel_limit *limit;
        int refclk = 48000;

        memset(&crtc_state->dpll_hw_state, 0,
               sizeof(crtc_state->dpll_hw_state));

        if (intel_crtc_has_type(crtc_state, INTEL_OUTPUT_LVDS)) {
                if (intel_panel_use_ssc(dev_priv)) {
                        refclk = dev_priv->vbt.lvds_ssc_freq;
                        DRM_DEBUG_KMS("using SSC reference clock of %d kHz\n", refclk);
                }

                limit = &intel_limits_i8xx_lvds;
        } else if (intel_crtc_has_type(crtc_state, INTEL_OUTPUT_DVO)) {
                limit = &intel_limits_i8xx_dvo;
        } else {
                limit = &intel_limits_i8xx_dac;
        }

        if (!crtc_state->clock_set &&
            !i9xx_find_best_dpll(limit, crtc_state, crtc_state->port_clock,
                                 refclk, NULL, &crtc_state->dpll)) {
                DRM_ERROR("Couldn't find PLL settings for mode!\n");
                return -EINVAL;
        }

        i8xx_compute_dpll(crtc, crtc_state, NULL);

        return 0;
}

static int g4x_crtc_compute_clock(struct intel_crtc *crtc,
                                  struct intel_crtc_state *crtc_state)
{
        struct drm_device *dev = crtc->base.dev;
        struct drm_i915_private *dev_priv = to_i915(dev);
        const struct intel_limit *limit;
        int refclk = 96000;

        memset(&crtc_state->dpll_hw_state, 0,
               sizeof(crtc_state->dpll_hw_state));

        if (intel_crtc_has_type(crtc_state, INTEL_OUTPUT_LVDS)) {
                if (intel_panel_use_ssc(dev_priv)) {
                        refclk = dev_priv->vbt.lvds_ssc_freq;
                        DRM_DEBUG_KMS("using SSC reference clock of %d kHz\n", refclk);
                }

                if (intel_is_dual_link_lvds(dev))
                        limit = &intel_limits_g4x_dual_channel_lvds;
                else
                        limit = &intel_limits_g4x_single_channel_lvds;
        } else if (intel_crtc_has_type(crtc_state, INTEL_OUTPUT_HDMI) ||
                   intel_crtc_has_type(crtc_state, INTEL_OUTPUT_ANALOG)) {
                limit = &intel_limits_g4x_hdmi;
        } else if (intel_crtc_has_type(crtc_state, INTEL_OUTPUT_SDVO)) {
                limit = &intel_limits_g4x_sdvo;
        } else {
                /* The option is for other outputs */
                limit = &intel_limits_i9xx_sdvo;
        }

        if (!crtc_state->clock_set &&
            !g4x_find_best_dpll(limit, crtc_state, crtc_state->port_clock,
                                refclk, NULL, &crtc_state->dpll)) {
                DRM_ERROR("Couldn't find PLL settings for mode!\n");
                return -EINVAL;
        }

        i9xx_compute_dpll(crtc, crtc_state, NULL);

        return 0;
}

static int pnv_crtc_compute_clock(struct intel_crtc *crtc,
                                  struct intel_crtc_state *crtc_state)
{
        struct drm_device *dev = crtc->base.dev;
        struct drm_i915_private *dev_priv = to_i915(dev);
        const struct intel_limit *limit;
        int refclk = 96000;

        memset(&crtc_state->dpll_hw_state, 0,
               sizeof(crtc_state->dpll_hw_state));

        if (intel_crtc_has_type(crtc_state, INTEL_OUTPUT_LVDS)) {
                if (intel_panel_use_ssc(dev_priv)) {
                        refclk = dev_priv->vbt.lvds_ssc_freq;
                        DRM_DEBUG_KMS("using SSC reference clock of %d kHz\n", refclk);
                }

                limit = &intel_limits_pineview_lvds;
        } else {
                limit = &intel_limits_pineview_sdvo;
        }

        if (!crtc_state->clock_set &&
            !pnv_find_best_dpll(limit, crtc_state, crtc_state->port_clock,
                                refclk, NULL, &crtc_state->dpll)) {
                DRM_ERROR("Couldn't find PLL settings for mode!\n");
                return -EINVAL;
        }

        i9xx_compute_dpll(crtc, crtc_state, NULL);

        return 0;
}

static int i9xx_crtc_compute_clock(struct intel_crtc *crtc,
                                   struct intel_crtc_state *crtc_state)
{
        struct drm_device *dev = crtc->base.dev;
        struct drm_i915_private *dev_priv = to_i915(dev);
        const struct intel_limit *limit;
        int refclk = 96000;

        memset(&crtc_state->dpll_hw_state, 0,
               sizeof(crtc_state->dpll_hw_state));

        if (intel_crtc_has_type(crtc_state, INTEL_OUTPUT_LVDS)) {
                if (intel_panel_use_ssc(dev_priv)) {
                        refclk = dev_priv->vbt.lvds_ssc_freq;
                        DRM_DEBUG_KMS("using SSC reference clock of %d kHz\n", refclk);
                }

                limit = &intel_limits_i9xx_lvds;
        } else {
                limit = &intel_limits_i9xx_sdvo;
        }

        if (!crtc_state->clock_set &&
            !i9xx_find_best_dpll(limit, crtc_state, crtc_state->port_clock,
                                 refclk, NULL, &crtc_state->dpll)) {
                DRM_ERROR("Couldn't find PLL settings for mode!\n");
                return -EINVAL;
        }

        i9xx_compute_dpll(crtc, crtc_state, NULL);

        return 0;
}

static int chv_crtc_compute_clock(struct intel_crtc *crtc,
                                  struct intel_crtc_state *crtc_state)
{
        int refclk = 100000;
        const struct intel_limit *limit = &intel_limits_chv;

        memset(&crtc_state->dpll_hw_state, 0,
               sizeof(crtc_state->dpll_hw_state));

        if (!crtc_state->clock_set &&
            !chv_find_best_dpll(limit, crtc_state, crtc_state->port_clock,
                                refclk, NULL, &crtc_state->dpll)) {
                DRM_ERROR("Couldn't find PLL settings for mode!\n");
                return -EINVAL;
        }

        chv_compute_dpll(crtc, crtc_state);

        return 0;
}

static int vlv_crtc_compute_clock(struct intel_crtc *crtc,
                                  struct intel_crtc_state *crtc_state)
{
        int refclk = 100000;
        const struct intel_limit *limit = &intel_limits_vlv;

        memset(&crtc_state->dpll_hw_state, 0,
               sizeof(crtc_state->dpll_hw_state));

        if (!crtc_state->clock_set &&
            !vlv_find_best_dpll(limit, crtc_state, crtc_state->port_clock,
                                refclk, NULL, &crtc_state->dpll)) {
                DRM_ERROR("Couldn't find PLL settings for mode!\n");
                return -EINVAL;
        }

        vlv_compute_dpll(crtc, crtc_state);

        return 0;
}

static void i9xx_get_pfit_config(struct intel_crtc *crtc,
                                 struct intel_crtc_state *pipe_config)
{
        struct drm_i915_private *dev_priv = to_i915(crtc->base.dev);
        uint32_t tmp;

        if (INTEL_GEN(dev_priv) <= 3 &&
            (IS_I830(dev_priv) || !IS_MOBILE(dev_priv)))
                return;

        tmp = I915_READ(PFIT_CONTROL);
        if (!(tmp & PFIT_ENABLE))
                return;

        /* Check whether the pfit is attached to our pipe. */
        if (INTEL_GEN(dev_priv) < 4) {
                if (crtc->pipe != PIPE_B)
                        return;
        } else {
                if ((tmp & PFIT_PIPE_MASK) != (crtc->pipe << PFIT_PIPE_SHIFT))
                        return;
        }

        pipe_config->gmch_pfit.control = tmp;
        pipe_config->gmch_pfit.pgm_ratios = I915_READ(PFIT_PGM_RATIOS);
}

static void vlv_crtc_clock_get(struct intel_crtc *crtc,
                               struct intel_crtc_state *pipe_config)
{
        struct drm_device *dev = crtc->base.dev;
        struct drm_i915_private *dev_priv = to_i915(dev);
        int pipe = pipe_config->cpu_transcoder;
        struct dpll clock;
        u32 mdiv;
        int refclk = 100000;

        /* In case of DSI, DPLL will not be used */
        if ((pipe_config->dpll_hw_state.dpll & DPLL_VCO_ENABLE) == 0)
                return;

        mutex_lock(&dev_priv->sb_lock);
        mdiv = vlv_dpio_read(dev_priv, pipe, VLV_PLL_DW3(pipe));
        mutex_unlock(&dev_priv->sb_lock);

        clock.m1 = (mdiv >> DPIO_M1DIV_SHIFT) & 7;
        clock.m2 = mdiv & DPIO_M2DIV_MASK;
        clock.n = (mdiv >> DPIO_N_SHIFT) & 0xf;
        clock.p1 = (mdiv >> DPIO_P1_SHIFT) & 7;
        clock.p2 = (mdiv >> DPIO_P2_SHIFT) & 0x1f;

        pipe_config->port_clock = vlv_calc_dpll_params(refclk, &clock);
}

static void
i9xx_get_initial_plane_config(struct intel_crtc *crtc,
                              struct intel_initial_plane_config *plane_config)
{
        struct drm_device *dev = crtc->base.dev;
        struct drm_i915_private *dev_priv = to_i915(dev);
        struct intel_plane *plane = to_intel_plane(crtc->base.primary);
        enum i9xx_plane_id i9xx_plane = plane->i9xx_plane;
        enum i915_pipe pipe;
        u32 val, base, offset;
        int fourcc, pixel_format;
        unsigned int aligned_height;
        struct drm_framebuffer *fb;
        struct intel_framebuffer *intel_fb;

        if (!plane->get_hw_state(plane, &pipe))
                return;

        WARN_ON(pipe != crtc->pipe);

        intel_fb = kzalloc(sizeof(*intel_fb), GFP_KERNEL);
        if (!intel_fb) {
                DRM_DEBUG_KMS("failed to alloc fb\n");
                return;
        }

        fb = &intel_fb->base;

        fb->dev = dev;

        val = I915_READ(DSPCNTR(i9xx_plane));

        if (INTEL_GEN(dev_priv) >= 4) {
                if (val & DISPPLANE_TILED) {
                        plane_config->tiling = I915_TILING_X;
                        fb->modifier = I915_FORMAT_MOD_X_TILED;
                }

                if (val & DISPPLANE_ROTATE_180)
                        plane_config->rotation = DRM_MODE_ROTATE_180;
        }

        if (IS_CHERRYVIEW(dev_priv) && pipe == PIPE_B &&
            val & DISPPLANE_MIRROR)
                plane_config->rotation |= DRM_MODE_REFLECT_X;

        pixel_format = val & DISPPLANE_PIXFORMAT_MASK;
        fourcc = i9xx_format_to_fourcc(pixel_format);
        fb->format = drm_format_info(fourcc);

        if (IS_HASWELL(dev_priv) || IS_BROADWELL(dev_priv)) {
                offset = I915_READ(DSPOFFSET(i9xx_plane));
                base = I915_READ(DSPSURF(i9xx_plane)) & 0xfffff000;
        } else if (INTEL_GEN(dev_priv) >= 4) {
                if (plane_config->tiling)
                        offset = I915_READ(DSPTILEOFF(i9xx_plane));
                else
                        offset = I915_READ(DSPLINOFF(i9xx_plane));
                base = I915_READ(DSPSURF(i9xx_plane)) & 0xfffff000;
        } else {
                base = I915_READ(DSPADDR(i9xx_plane));
        }
        plane_config->base = base;

        val = I915_READ(PIPESRC(pipe));
        fb->width = ((val >> 16) & 0xfff) + 1;
        fb->height = ((val >> 0) & 0xfff) + 1;

        val = I915_READ(DSPSTRIDE(i9xx_plane));
        fb->pitches[0] = val & 0xffffffc0;

        aligned_height = intel_fb_align_height(fb, 0, fb->height);

        plane_config->size = fb->pitches[0] * aligned_height;

        DRM_DEBUG_KMS("%s/%s with fb: size=%dx%d@%d, offset=%x, pitch %d, size 0x%x\n",
                      crtc->base.name, plane->base.name, fb->width, fb->height,
                      fb->format->cpp[0] * 8, base, fb->pitches[0],
                      plane_config->size);

        plane_config->fb = intel_fb;
}

static void chv_crtc_clock_get(struct intel_crtc *crtc,
                               struct intel_crtc_state *pipe_config)
{
        struct drm_device *dev = crtc->base.dev;
        struct drm_i915_private *dev_priv = to_i915(dev);
        int pipe = pipe_config->cpu_transcoder;
        enum dpio_channel port = vlv_pipe_to_channel(pipe);
        struct dpll clock;
        u32 cmn_dw13, pll_dw0, pll_dw1, pll_dw2, pll_dw3;
        int refclk = 100000;

        /* In case of DSI, DPLL will not be used */
        if ((pipe_config->dpll_hw_state.dpll & DPLL_VCO_ENABLE) == 0)
                return;

        mutex_lock(&dev_priv->sb_lock);
        cmn_dw13 = vlv_dpio_read(dev_priv, pipe, CHV_CMN_DW13(port));
        pll_dw0 = vlv_dpio_read(dev_priv, pipe, CHV_PLL_DW0(port));
        pll_dw1 = vlv_dpio_read(dev_priv, pipe, CHV_PLL_DW1(port));
        pll_dw2 = vlv_dpio_read(dev_priv, pipe, CHV_PLL_DW2(port));
        pll_dw3 = vlv_dpio_read(dev_priv, pipe, CHV_PLL_DW3(port));
        mutex_unlock(&dev_priv->sb_lock);

        clock.m1 = (pll_dw1 & 0x7) == DPIO_CHV_M1_DIV_BY_2 ? 2 : 0;
        clock.m2 = (pll_dw0 & 0xff) << 22;
        if (pll_dw3 & DPIO_CHV_FRAC_DIV_EN)
                clock.m2 |= pll_dw2 & 0x3fffff;
        clock.n = (pll_dw1 >> DPIO_CHV_N_DIV_SHIFT) & 0xf;
        clock.p1 = (cmn_dw13 >> DPIO_CHV_P1_DIV_SHIFT) & 0x7;
        clock.p2 = (cmn_dw13 >> DPIO_CHV_P2_DIV_SHIFT) & 0x1f;

        pipe_config->port_clock = chv_calc_dpll_params(refclk, &clock);
}

static bool i9xx_get_pipe_config(struct intel_crtc *crtc,
                                 struct intel_crtc_state *pipe_config)
{
        struct drm_i915_private *dev_priv = to_i915(crtc->base.dev);
        enum intel_display_power_domain power_domain;
        uint32_t tmp;
        bool ret;

        power_domain = POWER_DOMAIN_PIPE(crtc->pipe);
        if (!intel_display_power_get_if_enabled(dev_priv, power_domain))
                return false;

        pipe_config->cpu_transcoder = (enum transcoder) crtc->pipe;
        pipe_config->shared_dpll = NULL;

        ret = false;

        tmp = I915_READ(PIPECONF(crtc->pipe));
        if (!(tmp & PIPECONF_ENABLE))
                goto out;

        if (IS_G4X(dev_priv) || IS_VALLEYVIEW(dev_priv) ||
            IS_CHERRYVIEW(dev_priv)) {
                switch (tmp & PIPECONF_BPC_MASK) {
                case PIPECONF_6BPC:
                        pipe_config->pipe_bpp = 18;
                        break;
                case PIPECONF_8BPC:
                        pipe_config->pipe_bpp = 24;
                        break;
                case PIPECONF_10BPC:
                        pipe_config->pipe_bpp = 30;
                        break;
                default:
                        break;
                }
        }

        if ((IS_VALLEYVIEW(dev_priv) || IS_CHERRYVIEW(dev_priv)) &&
            (tmp & PIPECONF_COLOR_RANGE_SELECT))
                pipe_config->limited_color_range = true;

        if (INTEL_GEN(dev_priv) < 4)
                pipe_config->double_wide = tmp & PIPECONF_DOUBLE_WIDE;

        intel_get_pipe_timings(crtc, pipe_config);
        intel_get_pipe_src_size(crtc, pipe_config);

        i9xx_get_pfit_config(crtc, pipe_config);

        if (INTEL_GEN(dev_priv) >= 4) {
                /* No way to read it out on pipes B and C */
                if (IS_CHERRYVIEW(dev_priv) && crtc->pipe != PIPE_A)
                        tmp = dev_priv->chv_dpll_md[crtc->pipe];
                else
                        tmp = I915_READ(DPLL_MD(crtc->pipe));
                pipe_config->pixel_multiplier =
                        ((tmp & DPLL_MD_UDI_MULTIPLIER_MASK)
                         >> DPLL_MD_UDI_MULTIPLIER_SHIFT) + 1;
                pipe_config->dpll_hw_state.dpll_md = tmp;
        } else if (IS_I945G(dev_priv) || IS_I945GM(dev_priv) ||
                   IS_G33(dev_priv) || IS_PINEVIEW(dev_priv)) {
                tmp = I915_READ(DPLL(crtc->pipe));
                pipe_config->pixel_multiplier =
                        ((tmp & SDVO_MULTIPLIER_MASK)
                         >> SDVO_MULTIPLIER_SHIFT_HIRES) + 1;
        } else {
                /* Note that on i915G/GM the pixel multiplier is in the sdvo
                 * port and will be fixed up in the encoder->get_config
                 * function. */
                pipe_config->pixel_multiplier = 1;
        }
        pipe_config->dpll_hw_state.dpll = I915_READ(DPLL(crtc->pipe));
        if (!IS_VALLEYVIEW(dev_priv) && !IS_CHERRYVIEW(dev_priv)) {
                /*
                 * DPLL_DVO_2X_MODE must be enabled for both DPLLs
                 * on 830. Filter it out here so that we don't
                 * report errors due to that.
                 */
                if (IS_I830(dev_priv))
                        pipe_config->dpll_hw_state.dpll &= ~DPLL_DVO_2X_MODE;

                pipe_config->dpll_hw_state.fp0 = I915_READ(FP0(crtc->pipe));
                pipe_config->dpll_hw_state.fp1 = I915_READ(FP1(crtc->pipe));
        } else {
                /* Mask out read-only status bits. */
                pipe_config->dpll_hw_state.dpll &= ~(DPLL_LOCK_VLV |
                                                     DPLL_PORTC_READY_MASK |
                                                     DPLL_PORTB_READY_MASK);
        }

        if (IS_CHERRYVIEW(dev_priv))
                chv_crtc_clock_get(crtc, pipe_config);
        else if (IS_VALLEYVIEW(dev_priv))
                vlv_crtc_clock_get(crtc, pipe_config);
        else
                i9xx_crtc_clock_get(crtc, pipe_config);

        /*
         * Normally the dotclock is filled in by the encoder .get_config()
         * but in case the pipe is enabled w/o any ports we need a sane
         * default.
         */
        pipe_config->base.adjusted_mode.crtc_clock =
                pipe_config->port_clock / pipe_config->pixel_multiplier;

        ret = true;

out:
        intel_display_power_put(dev_priv, power_domain);

        return ret;
}

static void ironlake_init_pch_refclk(struct drm_i915_private *dev_priv)
{
        struct intel_encoder *encoder;
        int i;
        u32 val, final;
        bool has_lvds = false;
        bool has_cpu_edp = false;
        bool has_panel = false;
        bool has_ck505 = false;
        bool can_ssc = false;
        bool using_ssc_source = false;

        /* We need to take the global config into account */
        for_each_intel_encoder(&dev_priv->drm, encoder) {
                switch (encoder->type) {
                case INTEL_OUTPUT_LVDS:
                        has_panel = true;
                        has_lvds = true;
                        break;
                case INTEL_OUTPUT_EDP:
                        has_panel = true;
                        if (encoder->port == PORT_A)
                                has_cpu_edp = true;
                        break;
                default:
                        break;
                }
        }

        if (HAS_PCH_IBX(dev_priv)) {
                has_ck505 = dev_priv->vbt.display_clock_mode;
                can_ssc = has_ck505;
        } else {
                has_ck505 = false;
                can_ssc = true;
        }

        /* Check if any DPLLs are using the SSC source */
        for (i = 0; i < dev_priv->num_shared_dpll; i++) {
                u32 temp = I915_READ(PCH_DPLL(i));

                if (!(temp & DPLL_VCO_ENABLE))
                        continue;

                if ((temp & PLL_REF_INPUT_MASK) ==
                    PLLB_REF_INPUT_SPREADSPECTRUMIN) {
                        using_ssc_source = true;
                        break;
                }
        }

        DRM_DEBUG_KMS("has_panel %d has_lvds %d has_ck505 %d using_ssc_source %d\n",
                      has_panel, has_lvds, has_ck505, using_ssc_source);

        /* Ironlake: try to setup display ref clock before DPLL
         * enabling. This is only under driver's control after
         * PCH B stepping, previous chipset stepping should be
         * ignoring this setting.
         */
        val = I915_READ(PCH_DREF_CONTROL);

        /* As we must carefully and slowly disable/enable each source in turn,
         * compute the final state we want first and check if we need to
         * make any changes at all.
         */
        final = val;
        final &= ~DREF_NONSPREAD_SOURCE_MASK;
        if (has_ck505)
                final |= DREF_NONSPREAD_CK505_ENABLE;
        else
                final |= DREF_NONSPREAD_SOURCE_ENABLE;

        final &= ~DREF_SSC_SOURCE_MASK;
        final &= ~DREF_CPU_SOURCE_OUTPUT_MASK;
        final &= ~DREF_SSC1_ENABLE;

        if (has_panel) {
                final |= DREF_SSC_SOURCE_ENABLE;

                if (intel_panel_use_ssc(dev_priv) && can_ssc)
                        final |= DREF_SSC1_ENABLE;

                if (has_cpu_edp) {
                        if (intel_panel_use_ssc(dev_priv) && can_ssc)
                                final |= DREF_CPU_SOURCE_OUTPUT_DOWNSPREAD;
                        else
                                final |= DREF_CPU_SOURCE_OUTPUT_NONSPREAD;
                } else
                        final |= DREF_CPU_SOURCE_OUTPUT_DISABLE;
        } else if (using_ssc_source) {
                final |= DREF_SSC_SOURCE_ENABLE;
                final |= DREF_SSC1_ENABLE;
        }

        if (final == val)
                return;

        /* Always enable nonspread source */
        val &= ~DREF_NONSPREAD_SOURCE_MASK;

        if (has_ck505)
                val |= DREF_NONSPREAD_CK505_ENABLE;
        else
                val |= DREF_NONSPREAD_SOURCE_ENABLE;

        if (has_panel) {
                val &= ~DREF_SSC_SOURCE_MASK;
                val |= DREF_SSC_SOURCE_ENABLE;

                /* SSC must be turned on before enabling the CPU output  */
                if (intel_panel_use_ssc(dev_priv) && can_ssc) {
                        DRM_DEBUG_KMS("Using SSC on panel\n");
                        val |= DREF_SSC1_ENABLE;
                } else
                        val &= ~DREF_SSC1_ENABLE;

                /* Get SSC going before enabling the outputs */
                I915_WRITE(PCH_DREF_CONTROL, val);
                POSTING_READ(PCH_DREF_CONTROL);
                udelay(200);

                val &= ~DREF_CPU_SOURCE_OUTPUT_MASK;

                /* Enable CPU source on CPU attached eDP */
                if (has_cpu_edp) {
                        if (intel_panel_use_ssc(dev_priv) && can_ssc) {
                                DRM_DEBUG_KMS("Using SSC on eDP\n");
                                val |= DREF_CPU_SOURCE_OUTPUT_DOWNSPREAD;
                        } else
                                val |= DREF_CPU_SOURCE_OUTPUT_NONSPREAD;
                } else
                        val |= DREF_CPU_SOURCE_OUTPUT_DISABLE;

                I915_WRITE(PCH_DREF_CONTROL, val);
                POSTING_READ(PCH_DREF_CONTROL);
                udelay(200);
        } else {
                DRM_DEBUG_KMS("Disabling CPU source output\n");

                val &= ~DREF_CPU_SOURCE_OUTPUT_MASK;

                /* Turn off CPU output */
                val |= DREF_CPU_SOURCE_OUTPUT_DISABLE;

                I915_WRITE(PCH_DREF_CONTROL, val);
                POSTING_READ(PCH_DREF_CONTROL);
                udelay(200);

                if (!using_ssc_source) {
                        DRM_DEBUG_KMS("Disabling SSC source\n");

                        /* Turn off the SSC source */
                        val &= ~DREF_SSC_SOURCE_MASK;
                        val |= DREF_SSC_SOURCE_DISABLE;

                        /* Turn off SSC1 */
                        val &= ~DREF_SSC1_ENABLE;

                        I915_WRITE(PCH_DREF_CONTROL, val);
                        POSTING_READ(PCH_DREF_CONTROL);
                        udelay(200);
                }
        }

        BUG_ON(val != final);
}

static void lpt_reset_fdi_mphy(struct drm_i915_private *dev_priv)
{
        uint32_t tmp;

        tmp = I915_READ(SOUTH_CHICKEN2);
        tmp |= FDI_MPHY_IOSFSB_RESET_CTL;
        I915_WRITE(SOUTH_CHICKEN2, tmp);

        if (wait_for_us(I915_READ(SOUTH_CHICKEN2) &
                        FDI_MPHY_IOSFSB_RESET_STATUS, 100))
                DRM_ERROR("FDI mPHY reset assert timeout\n");

        tmp = I915_READ(SOUTH_CHICKEN2);
        tmp &= ~FDI_MPHY_IOSFSB_RESET_CTL;
        I915_WRITE(SOUTH_CHICKEN2, tmp);

        if (wait_for_us((I915_READ(SOUTH_CHICKEN2) &
                         FDI_MPHY_IOSFSB_RESET_STATUS) == 0, 100))
                DRM_ERROR("FDI mPHY reset de-assert timeout\n");
}

/* WaMPhyProgramming:hsw */
static void lpt_program_fdi_mphy(struct drm_i915_private *dev_priv)
{
        uint32_t tmp;

        tmp = intel_sbi_read(dev_priv, 0x8008, SBI_MPHY);
        tmp &= ~(0xFF << 24);
        tmp |= (0x12 << 24);
        intel_sbi_write(dev_priv, 0x8008, tmp, SBI_MPHY);

        tmp = intel_sbi_read(dev_priv, 0x2008, SBI_MPHY);
        tmp |= (1 << 11);
        intel_sbi_write(dev_priv, 0x2008, tmp, SBI_MPHY);

        tmp = intel_sbi_read(dev_priv, 0x2108, SBI_MPHY);
        tmp |= (1 << 11);
        intel_sbi_write(dev_priv, 0x2108, tmp, SBI_MPHY);

        tmp = intel_sbi_read(dev_priv, 0x206C, SBI_MPHY);
        tmp |= (1 << 24) | (1 << 21) | (1 << 18);
        intel_sbi_write(dev_priv, 0x206C, tmp, SBI_MPHY);

        tmp = intel_sbi_read(dev_priv, 0x216C, SBI_MPHY);
        tmp |= (1 << 24) | (1 << 21) | (1 << 18);
        intel_sbi_write(dev_priv, 0x216C, tmp, SBI_MPHY);

        tmp = intel_sbi_read(dev_priv, 0x2080, SBI_MPHY);
        tmp &= ~(7 << 13);
        tmp |= (5 << 13);
        intel_sbi_write(dev_priv, 0x2080, tmp, SBI_MPHY);

        tmp = intel_sbi_read(dev_priv, 0x2180, SBI_MPHY);
        tmp &= ~(7 << 13);
        tmp |= (5 << 13);
        intel_sbi_write(dev_priv, 0x2180, tmp, SBI_MPHY);

        tmp = intel_sbi_read(dev_priv, 0x208C, SBI_MPHY);
        tmp &= ~0xFF;
        tmp |= 0x1C;
        intel_sbi_write(dev_priv, 0x208C, tmp, SBI_MPHY);

        tmp = intel_sbi_read(dev_priv, 0x218C, SBI_MPHY);
        tmp &= ~0xFF;
        tmp |= 0x1C;
        intel_sbi_write(dev_priv, 0x218C, tmp, SBI_MPHY);

        tmp = intel_sbi_read(dev_priv, 0x2098, SBI_MPHY);
        tmp &= ~(0xFF << 16);
        tmp |= (0x1C << 16);
        intel_sbi_write(dev_priv, 0x2098, tmp, SBI_MPHY);

        tmp = intel_sbi_read(dev_priv, 0x2198, SBI_MPHY);
        tmp &= ~(0xFF << 16);
        tmp |= (0x1C << 16);
        intel_sbi_write(dev_priv, 0x2198, tmp, SBI_MPHY);

        tmp = intel_sbi_read(dev_priv, 0x20C4, SBI_MPHY);
        tmp |= (1 << 27);
        intel_sbi_write(dev_priv, 0x20C4, tmp, SBI_MPHY);

        tmp = intel_sbi_read(dev_priv, 0x21C4, SBI_MPHY);
        tmp |= (1 << 27);
        intel_sbi_write(dev_priv, 0x21C4, tmp, SBI_MPHY);

        tmp = intel_sbi_read(dev_priv, 0x20EC, SBI_MPHY);
        tmp &= ~(0xF << 28);
        tmp |= (4 << 28);
        intel_sbi_write(dev_priv, 0x20EC, tmp, SBI_MPHY);

        tmp = intel_sbi_read(dev_priv, 0x21EC, SBI_MPHY);
        tmp &= ~(0xF << 28);
        tmp |= (4 << 28);
        intel_sbi_write(dev_priv, 0x21EC, tmp, SBI_MPHY);
}

/* Implements 3 different sequences from BSpec chapter "Display iCLK
 * Programming" based on the parameters passed:
 * - Sequence to enable CLKOUT_DP
 * - Sequence to enable CLKOUT_DP without spread
 * - Sequence to enable CLKOUT_DP for FDI usage and configure PCH FDI I/O
 */
static void lpt_enable_clkout_dp(struct drm_i915_private *dev_priv,
                                 bool with_spread, bool with_fdi)
{
        uint32_t reg, tmp;

        if (WARN(with_fdi && !with_spread, "FDI requires downspread\n"))
                with_spread = true;
        if (WARN(HAS_PCH_LPT_LP(dev_priv) &&
            with_fdi, "LP PCH doesn't have FDI\n"))
                with_fdi = false;

        mutex_lock(&dev_priv->sb_lock);

        tmp = intel_sbi_read(dev_priv, SBI_SSCCTL, SBI_ICLK);
        tmp &= ~SBI_SSCCTL_DISABLE;
        tmp |= SBI_SSCCTL_PATHALT;
        intel_sbi_write(dev_priv, SBI_SSCCTL, tmp, SBI_ICLK);

        udelay(24);

        if (with_spread) {
                tmp = intel_sbi_read(dev_priv, SBI_SSCCTL, SBI_ICLK);
                tmp &= ~SBI_SSCCTL_PATHALT;
                intel_sbi_write(dev_priv, SBI_SSCCTL, tmp, SBI_ICLK);

                if (with_fdi) {
                        lpt_reset_fdi_mphy(dev_priv);
                        lpt_program_fdi_mphy(dev_priv);
                }
        }

        reg = HAS_PCH_LPT_LP(dev_priv) ? SBI_GEN0 : SBI_DBUFF0;
        tmp = intel_sbi_read(dev_priv, reg, SBI_ICLK);
        tmp |= SBI_GEN0_CFG_BUFFENABLE_DISABLE;
        intel_sbi_write(dev_priv, reg, tmp, SBI_ICLK);

        mutex_unlock(&dev_priv->sb_lock);
}

/* Sequence to disable CLKOUT_DP */
static void lpt_disable_clkout_dp(struct drm_i915_private *dev_priv)
{
        uint32_t reg, tmp;

        mutex_lock(&dev_priv->sb_lock);

        reg = HAS_PCH_LPT_LP(dev_priv) ? SBI_GEN0 : SBI_DBUFF0;
        tmp = intel_sbi_read(dev_priv, reg, SBI_ICLK);
        tmp &= ~SBI_GEN0_CFG_BUFFENABLE_DISABLE;
        intel_sbi_write(dev_priv, reg, tmp, SBI_ICLK);

        tmp = intel_sbi_read(dev_priv, SBI_SSCCTL, SBI_ICLK);
        if (!(tmp & SBI_SSCCTL_DISABLE)) {
                if (!(tmp & SBI_SSCCTL_PATHALT)) {
                        tmp |= SBI_SSCCTL_PATHALT;
                        intel_sbi_write(dev_priv, SBI_SSCCTL, tmp, SBI_ICLK);
                        udelay(32);
                }
                tmp |= SBI_SSCCTL_DISABLE;
                intel_sbi_write(dev_priv, SBI_SSCCTL, tmp, SBI_ICLK);
        }

        mutex_unlock(&dev_priv->sb_lock);
}

#define BEND_IDX(steps) ((50 + (steps)) / 5)

static const uint16_t sscdivintphase[] = {
        [BEND_IDX( 50)] = 0x3B23,
        [BEND_IDX( 45)] = 0x3B23,
        [BEND_IDX( 40)] = 0x3C23,
        [BEND_IDX( 35)] = 0x3C23,
        [BEND_IDX( 30)] = 0x3D23,
        [BEND_IDX( 25)] = 0x3D23,
        [BEND_IDX( 20)] = 0x3E23,
        [BEND_IDX( 15)] = 0x3E23,
        [BEND_IDX( 10)] = 0x3F23,
        [BEND_IDX(  5)] = 0x3F23,
        [BEND_IDX(  0)] = 0x0025,
        [BEND_IDX( -5)] = 0x0025,
        [BEND_IDX(-10)] = 0x0125,
        [BEND_IDX(-15)] = 0x0125,
        [BEND_IDX(-20)] = 0x0225,
        [BEND_IDX(-25)] = 0x0225,
        [BEND_IDX(-30)] = 0x0325,
        [BEND_IDX(-35)] = 0x0325,
        [BEND_IDX(-40)] = 0x0425,
        [BEND_IDX(-45)] = 0x0425,
        [BEND_IDX(-50)] = 0x0525,
};

/*
 * Bend CLKOUT_DP
 * steps -50 to 50 inclusive, in steps of 5
 * < 0 slow down the clock, > 0 speed up the clock, 0 == no bend (135MHz)
 * change in clock period = -(steps / 10) * 5.787 ps
 */
static void lpt_bend_clkout_dp(struct drm_i915_private *dev_priv, int steps)
{
        uint32_t tmp;
        int idx = BEND_IDX(steps);

        if (WARN_ON(steps % 5 != 0))
                return;

        if (WARN_ON(idx >= ARRAY_SIZE(sscdivintphase)))
                return;

        mutex_lock(&dev_priv->sb_lock);

        if (steps % 10 != 0)
                tmp = 0xAAAAAAAB;
        else
                tmp = 0x00000000;
        intel_sbi_write(dev_priv, SBI_SSCDITHPHASE, tmp, SBI_ICLK);

        tmp = intel_sbi_read(dev_priv, SBI_SSCDIVINTPHASE, SBI_ICLK);
        tmp &= 0xffff0000;
        tmp |= sscdivintphase[idx];
        intel_sbi_write(dev_priv, SBI_SSCDIVINTPHASE, tmp, SBI_ICLK);

        mutex_unlock(&dev_priv->sb_lock);
}

#undef BEND_IDX

static void lpt_init_pch_refclk(struct drm_i915_private *dev_priv)
{
        struct intel_encoder *encoder;
        bool has_vga = false;

        for_each_intel_encoder(&dev_priv->drm, encoder) {
                switch (encoder->type) {
                case INTEL_OUTPUT_ANALOG:
                        has_vga = true;
                        break;
                default:
                        break;
                }
        }

        if (has_vga) {
                lpt_bend_clkout_dp(dev_priv, 0);
                lpt_enable_clkout_dp(dev_priv, true, true);
        } else {
                lpt_disable_clkout_dp(dev_priv);
        }
}

/*
 * Initialize reference clocks when the driver loads
 */
void intel_init_pch_refclk(struct drm_i915_private *dev_priv)
{
        if (HAS_PCH_IBX(dev_priv) || HAS_PCH_CPT(dev_priv))
                ironlake_init_pch_refclk(dev_priv);
        else if (HAS_PCH_LPT(dev_priv))
                lpt_init_pch_refclk(dev_priv);
}

static void ironlake_set_pipeconf(struct drm_crtc *crtc)
{
        struct drm_i915_private *dev_priv = to_i915(crtc->dev);
        struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
        int pipe = intel_crtc->pipe;
        uint32_t val;

        val = 0;

        switch (intel_crtc->config->pipe_bpp) {
        case 18:
                val |= PIPECONF_6BPC;
                break;
        case 24:
                val |= PIPECONF_8BPC;
                break;
        case 30:
                val |= PIPECONF_10BPC;
                break;
        case 36:
                val |= PIPECONF_12BPC;
                break;
        default:
                /* Case prevented by intel_choose_pipe_bpp_dither. */
                BUG();
        }

        if (intel_crtc->config->dither)
                val |= (PIPECONF_DITHER_EN | PIPECONF_DITHER_TYPE_SP);

        if (intel_crtc->config->base.adjusted_mode.flags & DRM_MODE_FLAG_INTERLACE)
                val |= PIPECONF_INTERLACED_ILK;
        else
                val |= PIPECONF_PROGRESSIVE;

        if (intel_crtc->config->limited_color_range)
                val |= PIPECONF_COLOR_RANGE_SELECT;

        I915_WRITE(PIPECONF(pipe), val);
        POSTING_READ(PIPECONF(pipe));
}

static void haswell_set_pipeconf(struct drm_crtc *crtc)
{
        struct drm_i915_private *dev_priv = to_i915(crtc->dev);
        struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
        enum transcoder cpu_transcoder = intel_crtc->config->cpu_transcoder;
        u32 val = 0;

        if (IS_HASWELL(dev_priv) && intel_crtc->config->dither)
                val |= (PIPECONF_DITHER_EN | PIPECONF_DITHER_TYPE_SP);

        if (intel_crtc->config->base.adjusted_mode.flags & DRM_MODE_FLAG_INTERLACE)
                val |= PIPECONF_INTERLACED_ILK;
        else
                val |= PIPECONF_PROGRESSIVE;

        I915_WRITE(PIPECONF(cpu_transcoder), val);
        POSTING_READ(PIPECONF(cpu_transcoder));
}

static void haswell_set_pipemisc(struct drm_crtc *crtc)
{
        struct drm_i915_private *dev_priv = to_i915(crtc->dev);
        struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
        struct intel_crtc_state *config = intel_crtc->config;

        if (IS_BROADWELL(dev_priv) || INTEL_GEN(dev_priv) >= 9) {
                u32 val = 0;

                switch (intel_crtc->config->pipe_bpp) {
                case 18:
                        val |= PIPEMISC_DITHER_6_BPC;
                        break;
                case 24:
                        val |= PIPEMISC_DITHER_8_BPC;
                        break;
                case 30:
                        val |= PIPEMISC_DITHER_10_BPC;
                        break;
                case 36:
                        val |= PIPEMISC_DITHER_12_BPC;
                        break;
                default:
                        /* Case prevented by pipe_config_set_bpp. */
                        BUG();
                }

                if (intel_crtc->config->dither)
                        val |= PIPEMISC_DITHER_ENABLE | PIPEMISC_DITHER_TYPE_SP;

                if (config->ycbcr420) {
                        val |= PIPEMISC_OUTPUT_COLORSPACE_YUV |
                                PIPEMISC_YUV420_ENABLE |
                                PIPEMISC_YUV420_MODE_FULL_BLEND;
                }

                I915_WRITE(PIPEMISC(intel_crtc->pipe), val);
        }
}

int ironlake_get_lanes_required(int target_clock, int link_bw, int bpp)
{
        /*
         * Account for spread spectrum to avoid
         * oversubscribing the link. Max center spread
         * is 2.5%; use 5% for safety's sake.
         */
        u32 bps = target_clock * bpp * 21 / 20;
        return DIV_ROUND_UP(bps, link_bw * 8);
}

static bool ironlake_needs_fb_cb_tune(struct dpll *dpll, int factor)
{
        return i9xx_dpll_compute_m(dpll) < factor * dpll->n;
}

static void ironlake_compute_dpll(struct intel_crtc *intel_crtc,
                                  struct intel_crtc_state *crtc_state,
                                  struct dpll *reduced_clock)
{
        struct drm_crtc *crtc = &intel_crtc->base;
        struct drm_device *dev = crtc->dev;
        struct drm_i915_private *dev_priv = to_i915(dev);
        u32 dpll, fp, fp2;
        int factor;

        /* Enable autotuning of the PLL clock (if permissible) */
        factor = 21;
        if (intel_crtc_has_type(crtc_state, INTEL_OUTPUT_LVDS)) {
                if ((intel_panel_use_ssc(dev_priv) &&
                     dev_priv->vbt.lvds_ssc_freq == 100000) ||
                    (HAS_PCH_IBX(dev_priv) && intel_is_dual_link_lvds(dev)))
                        factor = 25;
        } else if (crtc_state->sdvo_tv_clock)
                factor = 20;

        fp = i9xx_dpll_compute_fp(&crtc_state->dpll);

        if (ironlake_needs_fb_cb_tune(&crtc_state->dpll, factor))
                fp |= FP_CB_TUNE;

        if (reduced_clock) {
                fp2 = i9xx_dpll_compute_fp(reduced_clock);

                if (reduced_clock->m < factor * reduced_clock->n)
                        fp2 |= FP_CB_TUNE;
        } else {
                fp2 = fp;
        }

        dpll = 0;

        if (intel_crtc_has_type(crtc_state, INTEL_OUTPUT_LVDS))
                dpll |= DPLLB_MODE_LVDS;
        else
                dpll |= DPLLB_MODE_DAC_SERIAL;

        dpll |= (crtc_state->pixel_multiplier - 1)
                << PLL_REF_SDVO_HDMI_MULTIPLIER_SHIFT;

        if (intel_crtc_has_type(crtc_state, INTEL_OUTPUT_SDVO) ||
            intel_crtc_has_type(crtc_state, INTEL_OUTPUT_HDMI))
                dpll |= DPLL_SDVO_HIGH_SPEED;

        if (intel_crtc_has_dp_encoder(crtc_state))
                dpll |= DPLL_SDVO_HIGH_SPEED;

        /*
         * The high speed IO clock is only really required for
         * SDVO/HDMI/DP, but we also enable it for CRT to make it
         * possible to share the DPLL between CRT and HDMI. Enabling
         * the clock needlessly does no real harm, except use up a
         * bit of power potentially.
         *
         * We'll limit this to IVB with 3 pipes, since it has only two
         * DPLLs and so DPLL sharing is the only way to get three pipes
         * driving PCH ports at the same time. On SNB we could do this,
         * and potentially avoid enabling the second DPLL, but it's not
         * clear if it''s a win or loss power wise. No point in doing
         * this on ILK at all since it has a fixed DPLL<->pipe mapping.
         */
        if (INTEL_INFO(dev_priv)->num_pipes == 3 &&
            intel_crtc_has_type(crtc_state, INTEL_OUTPUT_ANALOG))
                dpll |= DPLL_SDVO_HIGH_SPEED;

        /* compute bitmask from p1 value */
        dpll |= (1 << (crtc_state->dpll.p1 - 1)) << DPLL_FPA01_P1_POST_DIV_SHIFT;
        /* also FPA1 */
        dpll |= (1 << (crtc_state->dpll.p1 - 1)) << DPLL_FPA1_P1_POST_DIV_SHIFT;

        switch (crtc_state->dpll.p2) {
        case 5:
                dpll |= DPLL_DAC_SERIAL_P2_CLOCK_DIV_5;
                break;
        case 7:
                dpll |= DPLLB_LVDS_P2_CLOCK_DIV_7;
                break;
        case 10:
                dpll |= DPLL_DAC_SERIAL_P2_CLOCK_DIV_10;
                break;
        case 14:
                dpll |= DPLLB_LVDS_P2_CLOCK_DIV_14;
                break;
        }

        if (intel_crtc_has_type(crtc_state, INTEL_OUTPUT_LVDS) &&
            intel_panel_use_ssc(dev_priv))
                dpll |= PLLB_REF_INPUT_SPREADSPECTRUMIN;
        else
                dpll |= PLL_REF_INPUT_DREFCLK;

        dpll |= DPLL_VCO_ENABLE;

        crtc_state->dpll_hw_state.dpll = dpll;
        crtc_state->dpll_hw_state.fp0 = fp;
        crtc_state->dpll_hw_state.fp1 = fp2;
}

static int ironlake_crtc_compute_clock(struct intel_crtc *crtc,
                                       struct intel_crtc_state *crtc_state)
{
        struct drm_device *dev = crtc->base.dev;
        struct drm_i915_private *dev_priv = to_i915(dev);
        const struct intel_limit *limit;
        int refclk = 120000;

        memset(&crtc_state->dpll_hw_state, 0,
               sizeof(crtc_state->dpll_hw_state));

        /* CPU eDP is the only output that doesn't need a PCH PLL of its own. */
        if (!crtc_state->has_pch_encoder)
                return 0;

        if (intel_crtc_has_type(crtc_state, INTEL_OUTPUT_LVDS)) {
                if (intel_panel_use_ssc(dev_priv)) {
                        DRM_DEBUG_KMS("using SSC reference clock of %d kHz\n",
                                      dev_priv->vbt.lvds_ssc_freq);
                        refclk = dev_priv->vbt.lvds_ssc_freq;
                }

                if (intel_is_dual_link_lvds(dev)) {
                        if (refclk == 100000)
                                limit = &intel_limits_ironlake_dual_lvds_100m;
                        else
                                limit = &intel_limits_ironlake_dual_lvds;
                } else {
                        if (refclk == 100000)
                                limit = &intel_limits_ironlake_single_lvds_100m;
                        else
                                limit = &intel_limits_ironlake_single_lvds;
                }
        } else {
                limit = &intel_limits_ironlake_dac;
        }

        if (!crtc_state->clock_set &&
            !g4x_find_best_dpll(limit, crtc_state, crtc_state->port_clock,
                                refclk, NULL, &crtc_state->dpll)) {
                DRM_ERROR("Couldn't find PLL settings for mode!\n");
                return -EINVAL;
        }

        ironlake_compute_dpll(crtc, crtc_state, NULL);

        if (!intel_get_shared_dpll(crtc, crtc_state, NULL)) {
                DRM_DEBUG_KMS("failed to find PLL for pipe %c\n",
                              pipe_name(crtc->pipe));
                return -EINVAL;
        }

        return 0;
}

static void intel_pch_transcoder_get_m_n(struct intel_crtc *crtc,
                                         struct intel_link_m_n *m_n)
{
        struct drm_device *dev = crtc->base.dev;
        struct drm_i915_private *dev_priv = to_i915(dev);
        enum i915_pipe pipe = crtc->pipe;

        m_n->link_m = I915_READ(PCH_TRANS_LINK_M1(pipe));
        m_n->link_n = I915_READ(PCH_TRANS_LINK_N1(pipe));
        m_n->gmch_m = I915_READ(PCH_TRANS_DATA_M1(pipe))
                & ~TU_SIZE_MASK;
        m_n->gmch_n = I915_READ(PCH_TRANS_DATA_N1(pipe));
        m_n->tu = ((I915_READ(PCH_TRANS_DATA_M1(pipe))
                    & TU_SIZE_MASK) >> TU_SIZE_SHIFT) + 1;
}

static void intel_cpu_transcoder_get_m_n(struct intel_crtc *crtc,
                                         enum transcoder transcoder,
                                         struct intel_link_m_n *m_n,
                                         struct intel_link_m_n *m2_n2)
{
        struct drm_i915_private *dev_priv = to_i915(crtc->base.dev);
        enum i915_pipe pipe = crtc->pipe;

        if (INTEL_GEN(dev_priv) >= 5) {
                m_n->link_m = I915_READ(PIPE_LINK_M1(transcoder));
                m_n->link_n = I915_READ(PIPE_LINK_N1(transcoder));
                m_n->gmch_m = I915_READ(PIPE_DATA_M1(transcoder))
                        & ~TU_SIZE_MASK;
                m_n->gmch_n = I915_READ(PIPE_DATA_N1(transcoder));
                m_n->tu = ((I915_READ(PIPE_DATA_M1(transcoder))
                            & TU_SIZE_MASK) >> TU_SIZE_SHIFT) + 1;
                /* Read M2_N2 registers only for gen < 8 (M2_N2 available for
                 * gen < 8) and if DRRS is supported (to make sure the
                 * registers are not unnecessarily read).
                 */
                if (m2_n2 && INTEL_GEN(dev_priv) < 8 &&
                        crtc->config->has_drrs) {
                        m2_n2->link_m = I915_READ(PIPE_LINK_M2(transcoder));
                        m2_n2->link_n = I915_READ(PIPE_LINK_N2(transcoder));
                        m2_n2->gmch_m = I915_READ(PIPE_DATA_M2(transcoder))
                                        & ~TU_SIZE_MASK;
                        m2_n2->gmch_n = I915_READ(PIPE_DATA_N2(transcoder));
                        m2_n2->tu = ((I915_READ(PIPE_DATA_M2(transcoder))
                                        & TU_SIZE_MASK) >> TU_SIZE_SHIFT) + 1;
                }
        } else {
                m_n->link_m = I915_READ(PIPE_LINK_M_G4X(pipe));
                m_n->link_n = I915_READ(PIPE_LINK_N_G4X(pipe));
                m_n->gmch_m = I915_READ(PIPE_DATA_M_G4X(pipe))
                        & ~TU_SIZE_MASK;
                m_n->gmch_n = I915_READ(PIPE_DATA_N_G4X(pipe));
                m_n->tu = ((I915_READ(PIPE_DATA_M_G4X(pipe))
                            & TU_SIZE_MASK) >> TU_SIZE_SHIFT) + 1;
        }
}

void intel_dp_get_m_n(struct intel_crtc *crtc,
                      struct intel_crtc_state *pipe_config)
{
        if (pipe_config->has_pch_encoder)
                intel_pch_transcoder_get_m_n(crtc, &pipe_config->dp_m_n);
        else
                intel_cpu_transcoder_get_m_n(crtc, pipe_config->cpu_transcoder,
                                             &pipe_config->dp_m_n,
                                             &pipe_config->dp_m2_n2);
}

static void ironlake_get_fdi_m_n_config(struct intel_crtc *crtc,
                                        struct intel_crtc_state *pipe_config)
{
        intel_cpu_transcoder_get_m_n(crtc, pipe_config->cpu_transcoder,
                                     &pipe_config->fdi_m_n, NULL);
}

static void skylake_get_pfit_config(struct intel_crtc *crtc,
                                    struct intel_crtc_state *pipe_config)
{
        struct drm_device *dev = crtc->base.dev;
        struct drm_i915_private *dev_priv = to_i915(dev);
        struct intel_crtc_scaler_state *scaler_state = &pipe_config->scaler_state;
        uint32_t ps_ctrl = 0;
        int id = -1;
        int i;

        /* find scaler attached to this pipe */
        for (i = 0; i < crtc->num_scalers; i++) {
                ps_ctrl = I915_READ(SKL_PS_CTRL(crtc->pipe, i));
                if (ps_ctrl & PS_SCALER_EN && !(ps_ctrl & PS_PLANE_SEL_MASK)) {
                        id = i;
                        pipe_config->pch_pfit.enabled = true;
                        pipe_config->pch_pfit.pos = I915_READ(SKL_PS_WIN_POS(crtc->pipe, i));
                        pipe_config->pch_pfit.size = I915_READ(SKL_PS_WIN_SZ(crtc->pipe, i));
                        break;
                }
        }

        scaler_state->scaler_id = id;
        if (id >= 0) {
                scaler_state->scaler_users |= (1 << SKL_CRTC_INDEX);
        } else {
                scaler_state->scaler_users &= ~(1 << SKL_CRTC_INDEX);
        }
}

static void
skylake_get_initial_plane_config(struct intel_crtc *crtc,
                                 struct intel_initial_plane_config *plane_config)
{
        struct drm_device *dev = crtc->base.dev;
        struct drm_i915_private *dev_priv = to_i915(dev);
        struct intel_plane *plane = to_intel_plane(crtc->base.primary);
        enum plane_id plane_id = plane->id;
        enum i915_pipe pipe;
        u32 val, base, offset, stride_mult, tiling, alpha;
        int fourcc, pixel_format;
        unsigned int aligned_height;
        struct drm_framebuffer *fb;
        struct intel_framebuffer *intel_fb;

        if (!plane->get_hw_state(plane, &pipe))
                return;

        WARN_ON(pipe != crtc->pipe);

        intel_fb = kzalloc(sizeof(*intel_fb), GFP_KERNEL);
        if (!intel_fb) {
                DRM_DEBUG_KMS("failed to alloc fb\n");
                return;
        }

        fb = &intel_fb->base;

        fb->dev = dev;

        val = I915_READ(PLANE_CTL(pipe, plane_id));

        if (INTEL_GEN(dev_priv) >= 11)
                pixel_format = val & ICL_PLANE_CTL_FORMAT_MASK;
        else
                pixel_format = val & PLANE_CTL_FORMAT_MASK;

        if (INTEL_GEN(dev_priv) >= 10 || IS_GEMINILAKE(dev_priv)) {
                alpha = I915_READ(PLANE_COLOR_CTL(pipe, plane_id));
                alpha &= PLANE_COLOR_ALPHA_MASK;
        } else {
                alpha = val & PLANE_CTL_ALPHA_MASK;
        }

        fourcc = skl_format_to_fourcc(pixel_format,
                                      val & PLANE_CTL_ORDER_RGBX, alpha);
        fb->format = drm_format_info(fourcc);

        tiling = val & PLANE_CTL_TILED_MASK;
        switch (tiling) {
        case PLANE_CTL_TILED_LINEAR:
                fb->modifier = DRM_FORMAT_MOD_LINEAR;
                break;
        case PLANE_CTL_TILED_X:
                plane_config->tiling = I915_TILING_X;
                fb->modifier = I915_FORMAT_MOD_X_TILED;
                break;
        case PLANE_CTL_TILED_Y:
                plane_config->tiling = I915_TILING_Y;
                if (val & PLANE_CTL_RENDER_DECOMPRESSION_ENABLE)
                        fb->modifier = I915_FORMAT_MOD_Y_TILED_CCS;
                else
                        fb->modifier = I915_FORMAT_MOD_Y_TILED;
                break;
        case PLANE_CTL_TILED_YF:
                if (val & PLANE_CTL_RENDER_DECOMPRESSION_ENABLE)
                        fb->modifier = I915_FORMAT_MOD_Yf_TILED_CCS;
                else
                        fb->modifier = I915_FORMAT_MOD_Yf_TILED;
                break;
        default:
                MISSING_CASE(tiling);
                goto error;
        }

        /*
         * DRM_MODE_ROTATE_ is counter clockwise to stay compatible with Xrandr
         * while i915 HW rotation is clockwise, thats why this swapping.
         */
        switch (val & PLANE_CTL_ROTATE_MASK) {
        case PLANE_CTL_ROTATE_0:
                plane_config->rotation = DRM_MODE_ROTATE_0;
                break;
        case PLANE_CTL_ROTATE_90:
                plane_config->rotation = DRM_MODE_ROTATE_270;
                break;
        case PLANE_CTL_ROTATE_180:
                plane_config->rotation = DRM_MODE_ROTATE_180;
                break;
        case PLANE_CTL_ROTATE_270:
                plane_config->rotation = DRM_MODE_ROTATE_90;
                break;
        }

        if (INTEL_GEN(dev_priv) >= 10 &&
            val & PLANE_CTL_FLIP_HORIZONTAL)
                plane_config->rotation |= DRM_MODE_REFLECT_X;

        base = I915_READ(PLANE_SURF(pipe, plane_id)) & 0xfffff000;
        plane_config->base = base;

        offset = I915_READ(PLANE_OFFSET(pipe, plane_id));

        val = I915_READ(PLANE_SIZE(pipe, plane_id));
        fb->height = ((val >> 16) & 0xfff) + 1;
        fb->width = ((val >> 0) & 0x1fff) + 1;

        val = I915_READ(PLANE_STRIDE(pipe, plane_id));
        stride_mult = intel_fb_stride_alignment(fb, 0);
        fb->pitches[0] = (val & 0x3ff) * stride_mult;

        aligned_height = intel_fb_align_height(fb, 0, fb->height);

        plane_config->size = fb->pitches[0] * aligned_height;

        DRM_DEBUG_KMS("%s/%s with fb: size=%dx%d@%d, offset=%x, pitch %d, size 0x%x\n",
                      crtc->base.name, plane->base.name, fb->width, fb->height,
                      fb->format->cpp[0] * 8, base, fb->pitches[0],
                      plane_config->size);

        plane_config->fb = intel_fb;
        return;

error:
        kfree(intel_fb);
}

static void ironlake_get_pfit_config(struct intel_crtc *crtc,
                                     struct intel_crtc_state *pipe_config)
{
        struct drm_device *dev = crtc->base.dev;
        struct drm_i915_private *dev_priv = to_i915(dev);
        uint32_t tmp;

        tmp = I915_READ(PF_CTL(crtc->pipe));

        if (tmp & PF_ENABLE) {
                pipe_config->pch_pfit.enabled = true;
                pipe_config->pch_pfit.pos = I915_READ(PF_WIN_POS(crtc->pipe));
                pipe_config->pch_pfit.size = I915_READ(PF_WIN_SZ(crtc->pipe));

                /* We currently do not free assignements of panel fitters on
                 * ivb/hsw (since we don't use the higher upscaling modes which
                 * differentiates them) so just WARN about this case for now. */
                if (IS_GEN7(dev_priv)) {
                        WARN_ON((tmp & PF_PIPE_SEL_MASK_IVB) !=
                                PF_PIPE_SEL_IVB(crtc->pipe));
                }
        }
}

static bool ironlake_get_pipe_config(struct intel_crtc *crtc,
                                     struct intel_crtc_state *pipe_config)
{
        struct drm_device *dev = crtc->base.dev;
        struct drm_i915_private *dev_priv = to_i915(dev);
        enum intel_display_power_domain power_domain;
        uint32_t tmp;
        bool ret;

        power_domain = POWER_DOMAIN_PIPE(crtc->pipe);
        if (!intel_display_power_get_if_enabled(dev_priv, power_domain))
                return false;

        pipe_config->cpu_transcoder = (enum transcoder) crtc->pipe;
        pipe_config->shared_dpll = NULL;

        ret = false;
        tmp = I915_READ(PIPECONF(crtc->pipe));
        if (!(tmp & PIPECONF_ENABLE))
                goto out;

        switch (tmp & PIPECONF_BPC_MASK) {
        case PIPECONF_6BPC:
                pipe_config->pipe_bpp = 18;
                break;
        case PIPECONF_8BPC:
                pipe_config->pipe_bpp = 24;
                break;
        case PIPECONF_10BPC:
                pipe_config->pipe_bpp = 30;
                break;
        case PIPECONF_12BPC:
                pipe_config->pipe_bpp = 36;
                break;
        default:
                break;
        }

        if (tmp & PIPECONF_COLOR_RANGE_SELECT)
                pipe_config->limited_color_range = true;

        if (I915_READ(PCH_TRANSCONF(crtc->pipe)) & TRANS_ENABLE) {
                struct intel_shared_dpll *pll;
                enum intel_dpll_id pll_id;

                pipe_config->has_pch_encoder = true;

                tmp = I915_READ(FDI_RX_CTL(crtc->pipe));
                pipe_config->fdi_lanes = ((FDI_DP_PORT_WIDTH_MASK & tmp) >>
                                          FDI_DP_PORT_WIDTH_SHIFT) + 1;

                ironlake_get_fdi_m_n_config(crtc, pipe_config);

                if (HAS_PCH_IBX(dev_priv)) {
                        /*
                         * The pipe->pch transcoder and pch transcoder->pll
                         * mapping is fixed.
                         */
                        pll_id = (enum intel_dpll_id) crtc->pipe;
                } else {
                        tmp = I915_READ(PCH_DPLL_SEL);
                        if (tmp & TRANS_DPLLB_SEL(crtc->pipe))
                                pll_id = DPLL_ID_PCH_PLL_B;
                        else
                                pll_id= DPLL_ID_PCH_PLL_A;
                }

                pipe_config->shared_dpll =
                        intel_get_shared_dpll_by_id(dev_priv, pll_id);
                pll = pipe_config->shared_dpll;

                WARN_ON(!pll->info->funcs->get_hw_state(dev_priv, pll,
                                                &pipe_config->dpll_hw_state));

                tmp = pipe_config->dpll_hw_state.dpll;
                pipe_config->pixel_multiplier =
                        ((tmp & PLL_REF_SDVO_HDMI_MULTIPLIER_MASK)
                         >> PLL_REF_SDVO_HDMI_MULTIPLIER_SHIFT) + 1;

                ironlake_pch_clock_get(crtc, pipe_config);
        } else {
                pipe_config->pixel_multiplier = 1;
        }

        intel_get_pipe_timings(crtc, pipe_config);
        intel_get_pipe_src_size(crtc, pipe_config);

        ironlake_get_pfit_config(crtc, pipe_config);

        ret = true;

out:
        intel_display_power_put(dev_priv, power_domain);

        return ret;
}

static void assert_can_disable_lcpll(struct drm_i915_private *dev_priv)
{
        struct drm_device *dev = &dev_priv->drm;
        struct intel_crtc *crtc;

        for_each_intel_crtc(dev, crtc)
                I915_STATE_WARN(crtc->active, "CRTC for pipe %c enabled\n",
                     pipe_name(crtc->pipe));

        I915_STATE_WARN(I915_READ(HSW_PWR_WELL_CTL2),
                        "Display power well on\n");
        I915_STATE_WARN(I915_READ(SPLL_CTL) & SPLL_PLL_ENABLE, "SPLL enabled\n");
        I915_STATE_WARN(I915_READ(WRPLL_CTL(0)) & WRPLL_PLL_ENABLE, "WRPLL1 enabled\n");
        I915_STATE_WARN(I915_READ(WRPLL_CTL(1)) & WRPLL_PLL_ENABLE, "WRPLL2 enabled\n");
        I915_STATE_WARN(I915_READ(PP_STATUS(0)) & PP_ON, "Panel power on\n");
        I915_STATE_WARN(I915_READ(BLC_PWM_CPU_CTL2) & BLM_PWM_ENABLE,
             "CPU PWM1 enabled\n");
        if (IS_HASWELL(dev_priv))
                I915_STATE_WARN(I915_READ(HSW_BLC_PWM2_CTL) & BLM_PWM_ENABLE,
                     "CPU PWM2 enabled\n");
        I915_STATE_WARN(I915_READ(BLC_PWM_PCH_CTL1) & BLM_PCH_PWM_ENABLE,
             "PCH PWM1 enabled\n");
        I915_STATE_WARN(I915_READ(UTIL_PIN_CTL) & UTIL_PIN_ENABLE,
             "Utility pin enabled\n");
        I915_STATE_WARN(I915_READ(PCH_GTC_CTL) & PCH_GTC_ENABLE, "PCH GTC enabled\n");

        /*
         * In theory we can still leave IRQs enabled, as long as only the HPD
         * interrupts remain enabled. We used to check for that, but since it's
         * gen-specific and since we only disable LCPLL after we fully disable
         * the interrupts, the check below should be enough.
         */
        I915_STATE_WARN(intel_irqs_enabled(dev_priv), "IRQs enabled\n");
}

static uint32_t hsw_read_dcomp(struct drm_i915_private *dev_priv)
{
        if (IS_HASWELL(dev_priv))
                return I915_READ(D_COMP_HSW);
        else
                return I915_READ(D_COMP_BDW);
}

static void hsw_write_dcomp(struct drm_i915_private *dev_priv, uint32_t val)
{
        if (IS_HASWELL(dev_priv)) {
                mutex_lock(&dev_priv->pcu_lock);
                if (sandybridge_pcode_write(dev_priv, GEN6_PCODE_WRITE_D_COMP,
                                            val))
                        DRM_DEBUG_KMS("Failed to write to D_COMP\n");
                mutex_unlock(&dev_priv->pcu_lock);
        } else {
                I915_WRITE(D_COMP_BDW, val);
                POSTING_READ(D_COMP_BDW);
        }
}

/*
 * This function implements pieces of two sequences from BSpec:
 * - Sequence for display software to disable LCPLL
 * - Sequence for display software to allow package C8+
 * The steps implemented here are just the steps that actually touch the LCPLL
 * register. Callers should take care of disabling all the display engine
 * functions, doing the mode unset, fixing interrupts, etc.
 */
static void hsw_disable_lcpll(struct drm_i915_private *dev_priv,
                              bool switch_to_fclk, bool allow_power_down)
{
        uint32_t val;

        assert_can_disable_lcpll(dev_priv);

        val = I915_READ(LCPLL_CTL);

        if (switch_to_fclk) {
                val |= LCPLL_CD_SOURCE_FCLK;
                I915_WRITE(LCPLL_CTL, val);

                if (wait_for_us(I915_READ(LCPLL_CTL) &
                                LCPLL_CD_SOURCE_FCLK_DONE, 1))
                        DRM_ERROR("Switching to FCLK failed\n");

                val = I915_READ(LCPLL_CTL);
        }

        val |= LCPLL_PLL_DISABLE;
        I915_WRITE(LCPLL_CTL, val);
        POSTING_READ(LCPLL_CTL);

        if (intel_wait_for_register(dev_priv, LCPLL_CTL, LCPLL_PLL_LOCK, 0, 1))
                DRM_ERROR("LCPLL still locked\n");

        val = hsw_read_dcomp(dev_priv);
        val |= D_COMP_COMP_DISABLE;
        hsw_write_dcomp(dev_priv, val);
        ndelay(100);

        if (wait_for((hsw_read_dcomp(dev_priv) & D_COMP_RCOMP_IN_PROGRESS) == 0,
                     1))
                DRM_ERROR("D_COMP RCOMP still in progress\n");

        if (allow_power_down) {
                val = I915_READ(LCPLL_CTL);
                val |= LCPLL_POWER_DOWN_ALLOW;
                I915_WRITE(LCPLL_CTL, val);
                POSTING_READ(LCPLL_CTL);
        }
}

/*
 * Fully restores LCPLL, disallowing power down and switching back to LCPLL
 * source.
 */
static void hsw_restore_lcpll(struct drm_i915_private *dev_priv)
{
        uint32_t val;

        val = I915_READ(LCPLL_CTL);

        if ((val & (LCPLL_PLL_LOCK | LCPLL_PLL_DISABLE | LCPLL_CD_SOURCE_FCLK |
                    LCPLL_POWER_DOWN_ALLOW)) == LCPLL_PLL_LOCK)
                return;

        /*
         * Make sure we're not on PC8 state before disabling PC8, otherwise
         * we'll hang the machine. To prevent PC8 state, just enable force_wake.
         */
        intel_uncore_forcewake_get(dev_priv, FORCEWAKE_ALL);

        if (val & LCPLL_POWER_DOWN_ALLOW) {
                val &= ~LCPLL_POWER_DOWN_ALLOW;
                I915_WRITE(LCPLL_CTL, val);
                POSTING_READ(LCPLL_CTL);
        }

        val = hsw_read_dcomp(dev_priv);
        val |= D_COMP_COMP_FORCE;
        val &= ~D_COMP_COMP_DISABLE;
        hsw_write_dcomp(dev_priv, val);

        val = I915_READ(LCPLL_CTL);
        val &= ~LCPLL_PLL_DISABLE;
        I915_WRITE(LCPLL_CTL, val);

        if (intel_wait_for_register(dev_priv,
                                    LCPLL_CTL, LCPLL_PLL_LOCK, LCPLL_PLL_LOCK,
                                    5))
                DRM_ERROR("LCPLL not locked yet\n");

        if (val & LCPLL_CD_SOURCE_FCLK) {
                val = I915_READ(LCPLL_CTL);
                val &= ~LCPLL_CD_SOURCE_FCLK;
                I915_WRITE(LCPLL_CTL, val);

                if (wait_for_us((I915_READ(LCPLL_CTL) &
                                 LCPLL_CD_SOURCE_FCLK_DONE) == 0, 1))
                        DRM_ERROR("Switching back to LCPLL failed\n");
        }

        intel_uncore_forcewake_put(dev_priv, FORCEWAKE_ALL);

        intel_update_cdclk(dev_priv);
        intel_dump_cdclk_state(&dev_priv->cdclk.hw, "Current CDCLK");
}

/*
 * Package states C8 and deeper are really deep PC states that can only be
 * reached when all the devices on the system allow it, so even if the graphics
 * device allows PC8+, it doesn't mean the system will actually get to these
 * states. Our driver only allows PC8+ when going into runtime PM.
 *
 * The requirements for PC8+ are that all the outputs are disabled, the power
 * well is disabled and most interrupts are disabled, and these are also
 * requirements for runtime PM. When these conditions are met, we manually do
 * the other conditions: disable the interrupts, clocks and switch LCPLL refclk
 * to Fclk. If we're in PC8+ and we get an non-hotplug interrupt, we can hard
 * hang the machine.
 *
 * When we really reach PC8 or deeper states (not just when we allow it) we lose
 * the state of some registers, so when we come back from PC8+ we need to
 * restore this state. We don't get into PC8+ if we're not in RC6, so we don't
 * need to take care of the registers kept by RC6. Notice that this happens even
 * if we don't put the device in PCI D3 state (which is what currently happens
 * because of the runtime PM support).
 *
 * For more, read "Display Sequences for Package C8" on the hardware
 * documentation.
 */
void hsw_enable_pc8(struct drm_i915_private *dev_priv)
{
        uint32_t val;

        DRM_DEBUG_KMS("Enabling package C8+\n");

        if (HAS_PCH_LPT_LP(dev_priv)) {
                val = I915_READ(SOUTH_DSPCLK_GATE_D);
                val &= ~PCH_LP_PARTITION_LEVEL_DISABLE;
                I915_WRITE(SOUTH_DSPCLK_GATE_D, val);
        }

        lpt_disable_clkout_dp(dev_priv);
        hsw_disable_lcpll(dev_priv, true, true);
}

void hsw_disable_pc8(struct drm_i915_private *dev_priv)
{
        uint32_t val;

        DRM_DEBUG_KMS("Disabling package C8+\n");

        hsw_restore_lcpll(dev_priv);
        lpt_init_pch_refclk(dev_priv);

        if (HAS_PCH_LPT_LP(dev_priv)) {
                val = I915_READ(SOUTH_DSPCLK_GATE_D);
                val |= PCH_LP_PARTITION_LEVEL_DISABLE;
                I915_WRITE(SOUTH_DSPCLK_GATE_D, val);
        }
}

static int haswell_crtc_compute_clock(struct intel_crtc *crtc,
                                      struct intel_crtc_state *crtc_state)
{
        struct intel_atomic_state *state =
                to_intel_atomic_state(crtc_state->base.state);

        if (!intel_crtc_has_type(crtc_state, INTEL_OUTPUT_DSI)) {
                struct intel_encoder *encoder =
                        intel_get_crtc_new_encoder(state, crtc_state);

                if (!intel_get_shared_dpll(crtc, crtc_state, encoder)) {
                        DRM_DEBUG_KMS("failed to find PLL for pipe %c\n",
                                      pipe_name(crtc->pipe));
                        return -EINVAL;
                }
        }

        return 0;
}

static void cannonlake_get_ddi_pll(struct drm_i915_private *dev_priv,
                                   enum port port,
                                   struct intel_crtc_state *pipe_config)
{
        enum intel_dpll_id id;
        u32 temp;

        temp = I915_READ(DPCLKA_CFGCR0) & DPCLKA_CFGCR0_DDI_CLK_SEL_MASK(port);
        id = temp >> DPCLKA_CFGCR0_DDI_CLK_SEL_SHIFT(port);

        if (WARN_ON(id < SKL_DPLL0 || id > SKL_DPLL2))
                return;

        pipe_config->shared_dpll = intel_get_shared_dpll_by_id(dev_priv, id);
}

static void icelake_get_ddi_pll(struct drm_i915_private *dev_priv,
                                enum port port,
                                struct intel_crtc_state *pipe_config)
{
        enum intel_dpll_id id;
        u32 temp;

        /* TODO: TBT pll not implemented. */
        switch (port) {
        case PORT_A:
        case PORT_B:
                temp = I915_READ(DPCLKA_CFGCR0_ICL) &
                       DPCLKA_CFGCR0_DDI_CLK_SEL_MASK(port);
                id = temp >> DPCLKA_CFGCR0_DDI_CLK_SEL_SHIFT(port);

                if (WARN_ON(id != DPLL_ID_ICL_DPLL0 && id != DPLL_ID_ICL_DPLL1))
                        return;
                break;
        case PORT_C:
                id = DPLL_ID_ICL_MGPLL1;
                break;
        case PORT_D:
                id = DPLL_ID_ICL_MGPLL2;
                break;
        case PORT_E:
                id = DPLL_ID_ICL_MGPLL3;
                break;
        case PORT_F:
                id = DPLL_ID_ICL_MGPLL4;
                break;
        default:
                MISSING_CASE(port);
                return;
        }

        pipe_config->shared_dpll = intel_get_shared_dpll_by_id(dev_priv, id);
}

static void bxt_get_ddi_pll(struct drm_i915_private *dev_priv,
                                enum port port,
                                struct intel_crtc_state *pipe_config)
{
        enum intel_dpll_id id;

        switch (port) {
        case PORT_A:
                id = DPLL_ID_SKL_DPLL0;
                break;
        case PORT_B:
                id = DPLL_ID_SKL_DPLL1;
                break;
        case PORT_C:
                id = DPLL_ID_SKL_DPLL2;
                break;
        default:
                DRM_ERROR("Incorrect port type\n");
                return;
        }

        pipe_config->shared_dpll = intel_get_shared_dpll_by_id(dev_priv, id);
}

static void skylake_get_ddi_pll(struct drm_i915_private *dev_priv,
                                enum port port,
                                struct intel_crtc_state *pipe_config)
{
        enum intel_dpll_id id;
        u32 temp;

        temp = I915_READ(DPLL_CTRL2) & DPLL_CTRL2_DDI_CLK_SEL_MASK(port);
        id = temp >> (port * 3 + 1);

        if (WARN_ON(id < SKL_DPLL0 || id > SKL_DPLL3))
                return;

        pipe_config->shared_dpll = intel_get_shared_dpll_by_id(dev_priv, id);
}

static void haswell_get_ddi_pll(struct drm_i915_private *dev_priv,
                                enum port port,
                                struct intel_crtc_state *pipe_config)
{
        enum intel_dpll_id id;
        uint32_t ddi_pll_sel = I915_READ(PORT_CLK_SEL(port));

        switch (ddi_pll_sel) {
        case PORT_CLK_SEL_WRPLL1:
                id = DPLL_ID_WRPLL1;
                break;
        case PORT_CLK_SEL_WRPLL2:
                id = DPLL_ID_WRPLL2;
                break;
        case PORT_CLK_SEL_SPLL:
                id = DPLL_ID_SPLL;
                break;
        case PORT_CLK_SEL_LCPLL_810:
                id = DPLL_ID_LCPLL_810;
                break;
        case PORT_CLK_SEL_LCPLL_1350:
                id = DPLL_ID_LCPLL_1350;
                break;
        case PORT_CLK_SEL_LCPLL_2700:
                id = DPLL_ID_LCPLL_2700;
                break;
        default:
                MISSING_CASE(ddi_pll_sel);
                /* fall through */
        case PORT_CLK_SEL_NONE:
                return;
        }

        pipe_config->shared_dpll = intel_get_shared_dpll_by_id(dev_priv, id);
}

static bool hsw_get_transcoder_state(struct intel_crtc *crtc,
                                     struct intel_crtc_state *pipe_config,
                                     u64 *power_domain_mask)
{
        struct drm_device *dev = crtc->base.dev;
        struct drm_i915_private *dev_priv = to_i915(dev);
        enum intel_display_power_domain power_domain;
        u32 tmp;

        /*
         * The pipe->transcoder mapping is fixed with the exception of the eDP
         * transcoder handled below.
         */
        pipe_config->cpu_transcoder = (enum transcoder) crtc->pipe;

        /*
         * XXX: Do intel_display_power_get_if_enabled before reading this (for
         * consistency and less surprising code; it's in always on power).
         */
        tmp = I915_READ(TRANS_DDI_FUNC_CTL(TRANSCODER_EDP));
        if (tmp & TRANS_DDI_FUNC_ENABLE) {
                enum i915_pipe trans_edp_pipe;
                switch (tmp & TRANS_DDI_EDP_INPUT_MASK) {
                default:
                        WARN(1, "unknown pipe linked to edp transcoder\n");
                        /* fall through */
                case TRANS_DDI_EDP_INPUT_A_ONOFF:
                case TRANS_DDI_EDP_INPUT_A_ON:
                        trans_edp_pipe = PIPE_A;
                        break;
                case TRANS_DDI_EDP_INPUT_B_ONOFF:
                        trans_edp_pipe = PIPE_B;
                        break;
                case TRANS_DDI_EDP_INPUT_C_ONOFF:
                        trans_edp_pipe = PIPE_C;
                        break;
                }

                if (trans_edp_pipe == crtc->pipe)
                        pipe_config->cpu_transcoder = TRANSCODER_EDP;
        }

        power_domain = POWER_DOMAIN_TRANSCODER(pipe_config->cpu_transcoder);
        if (!intel_display_power_get_if_enabled(dev_priv, power_domain))
                return false;
        *power_domain_mask |= BIT_ULL(power_domain);

        tmp = I915_READ(PIPECONF(pipe_config->cpu_transcoder));

        return tmp & PIPECONF_ENABLE;
}

static bool bxt_get_dsi_transcoder_state(struct intel_crtc *crtc,
                                         struct intel_crtc_state *pipe_config,
                                         u64 *power_domain_mask)
{
        struct drm_device *dev = crtc->base.dev;
        struct drm_i915_private *dev_priv = to_i915(dev);
        enum intel_display_power_domain power_domain;
        enum port port;
        enum transcoder cpu_transcoder;
        u32 tmp;

        for_each_port_masked(port, BIT(PORT_A) | BIT(PORT_C)) {
                if (port == PORT_A)
                        cpu_transcoder = TRANSCODER_DSI_A;
                else
                        cpu_transcoder = TRANSCODER_DSI_C;

                power_domain = POWER_DOMAIN_TRANSCODER(cpu_transcoder);
                if (!intel_display_power_get_if_enabled(dev_priv, power_domain))
                        continue;
                *power_domain_mask |= BIT_ULL(power_domain);

                /*
                 * The PLL needs to be enabled with a valid divider
                 * configuration, otherwise accessing DSI registers will hang
                 * the machine. See BSpec North Display Engine
                 * registers/MIPI[BXT]. We can break out here early, since we
                 * need the same DSI PLL to be enabled for both DSI ports.
                 */
                if (!bxt_dsi_pll_is_enabled(dev_priv))
                        break;

                /* XXX: this works for video mode only */
                tmp = I915_READ(BXT_MIPI_PORT_CTRL(port));
                if (!(tmp & DPI_ENABLE))
                        continue;

                tmp = I915_READ(MIPI_CTRL(port));
                if ((tmp & BXT_PIPE_SELECT_MASK) != BXT_PIPE_SELECT(crtc->pipe))
                        continue;

                pipe_config->cpu_transcoder = cpu_transcoder;
                break;
        }

        return transcoder_is_dsi(pipe_config->cpu_transcoder);
}

static void haswell_get_ddi_port_state(struct intel_crtc *crtc,
                                       struct intel_crtc_state *pipe_config)
{
        struct drm_i915_private *dev_priv = to_i915(crtc->base.dev);
        struct intel_shared_dpll *pll;
        enum port port;
        uint32_t tmp;

        tmp = I915_READ(TRANS_DDI_FUNC_CTL(pipe_config->cpu_transcoder));

        port = (tmp & TRANS_DDI_PORT_MASK) >> TRANS_DDI_PORT_SHIFT;

        if (IS_ICELAKE(dev_priv))
                icelake_get_ddi_pll(dev_priv, port, pipe_config);
        else if (IS_CANNONLAKE(dev_priv))
                cannonlake_get_ddi_pll(dev_priv, port, pipe_config);
        else if (IS_GEN9_BC(dev_priv))
                skylake_get_ddi_pll(dev_priv, port, pipe_config);
        else if (IS_GEN9_LP(dev_priv))
                bxt_get_ddi_pll(dev_priv, port, pipe_config);
        else
                haswell_get_ddi_pll(dev_priv, port, pipe_config);

        pll = pipe_config->shared_dpll;
        if (pll) {
                WARN_ON(!pll->info->funcs->get_hw_state(dev_priv, pll,
                                                &pipe_config->dpll_hw_state));
        }

        /*
         * Haswell has only FDI/PCH transcoder A. It is which is connected to
         * DDI E. So just check whether this pipe is wired to DDI E and whether
         * the PCH transcoder is on.
         */
        if (INTEL_GEN(dev_priv) < 9 &&
            (port == PORT_E) && I915_READ(LPT_TRANSCONF) & TRANS_ENABLE) {
                pipe_config->has_pch_encoder = true;

                tmp = I915_READ(FDI_RX_CTL(PIPE_A));
                pipe_config->fdi_lanes = ((FDI_DP_PORT_WIDTH_MASK & tmp) >>
                                          FDI_DP_PORT_WIDTH_SHIFT) + 1;

                ironlake_get_fdi_m_n_config(crtc, pipe_config);
        }
}

static bool haswell_get_pipe_config(struct intel_crtc *crtc,
                                    struct intel_crtc_state *pipe_config)
{
        struct drm_i915_private *dev_priv = to_i915(crtc->base.dev);
        enum intel_display_power_domain power_domain;
        u64 power_domain_mask;
        bool active;

        intel_crtc_init_scalers(crtc, pipe_config);

        power_domain = POWER_DOMAIN_PIPE(crtc->pipe);
        if (!intel_display_power_get_if_enabled(dev_priv, power_domain))
                return false;
        power_domain_mask = BIT_ULL(power_domain);

        pipe_config->shared_dpll = NULL;

        active = hsw_get_transcoder_state(crtc, pipe_config, &power_domain_mask);

        if (IS_GEN9_LP(dev_priv) &&
            bxt_get_dsi_transcoder_state(crtc, pipe_config, &power_domain_mask)) {
                WARN_ON(active);
                active = true;
        }

        if (!active)
                goto out;

        if (!transcoder_is_dsi(pipe_config->cpu_transcoder)) {
                haswell_get_ddi_port_state(crtc, pipe_config);
                intel_get_pipe_timings(crtc, pipe_config);
        }

        intel_get_pipe_src_size(crtc, pipe_config);

        pipe_config->gamma_mode =
                I915_READ(GAMMA_MODE(crtc->pipe)) & GAMMA_MODE_MODE_MASK;

        if (IS_BROADWELL(dev_priv) || INTEL_GEN(dev_priv) >= 9) {
                u32 tmp = I915_READ(PIPEMISC(crtc->pipe));
                bool clrspace_yuv = tmp & PIPEMISC_OUTPUT_COLORSPACE_YUV;

                if (IS_GEMINILAKE(dev_priv) || INTEL_GEN(dev_priv) >= 10) {
                        bool blend_mode_420 = tmp &
                                              PIPEMISC_YUV420_MODE_FULL_BLEND;

                        pipe_config->ycbcr420 = tmp & PIPEMISC_YUV420_ENABLE;
                        if (pipe_config->ycbcr420 != clrspace_yuv ||
                            pipe_config->ycbcr420 != blend_mode_420)
                                DRM_DEBUG_KMS("Bad 4:2:0 mode (%08x)\n", tmp);
                } else if (clrspace_yuv) {
                        DRM_DEBUG_KMS("YCbCr 4:2:0 Unsupported\n");
                }
        }

        power_domain = POWER_DOMAIN_PIPE_PANEL_FITTER(crtc->pipe);
        if (intel_display_power_get_if_enabled(dev_priv, power_domain)) {
                power_domain_mask |= BIT_ULL(power_domain);
                if (INTEL_GEN(dev_priv) >= 9)
                        skylake_get_pfit_config(crtc, pipe_config);
                else
                        ironlake_get_pfit_config(crtc, pipe_config);
        }

        if (hsw_crtc_supports_ips(crtc)) {
                if (IS_HASWELL(dev_priv))
                        pipe_config->ips_enabled = I915_READ(IPS_CTL) & IPS_ENABLE;
                else {
                        /*
                         * We cannot readout IPS state on broadwell, set to
                         * true so we can set it to a defined state on first
                         * commit.
                         */
                        pipe_config->ips_enabled = true;
                }
        }

        if (pipe_config->cpu_transcoder != TRANSCODER_EDP &&
            !transcoder_is_dsi(pipe_config->cpu_transcoder)) {
                pipe_config->pixel_multiplier =
                        I915_READ(PIPE_MULT(pipe_config->cpu_transcoder)) + 1;
        } else {
                pipe_config->pixel_multiplier = 1;
        }

out:
        for_each_power_domain(power_domain, power_domain_mask)
                intel_display_power_put(dev_priv, power_domain);

        return active;
}

static u32 intel_cursor_base(const struct intel_plane_state *plane_state)
{
        struct drm_i915_private *dev_priv =
                to_i915(plane_state->base.plane->dev);
        const struct drm_framebuffer *fb = plane_state->base.fb;
        const struct drm_i915_gem_object *obj = intel_fb_obj(fb);
        u32 base;

        if (INTEL_INFO(dev_priv)->cursor_needs_physical)
                base = obj->phys_handle->busaddr;
        else
                base = intel_plane_ggtt_offset(plane_state);

        base += plane_state->color_plane[0].offset;

        /* ILK+ do this automagically */
        if (HAS_GMCH_DISPLAY(dev_priv) &&
            plane_state->base.rotation & DRM_MODE_ROTATE_180)
                base += (plane_state->base.crtc_h *
                         plane_state->base.crtc_w - 1) * fb->format->cpp[0];

        return base;
}

static u32 intel_cursor_position(const struct intel_plane_state *plane_state)
{
        int x = plane_state->base.crtc_x;
        int y = plane_state->base.crtc_y;
        u32 pos = 0;

        if (x < 0) {
                pos |= CURSOR_POS_SIGN << CURSOR_X_SHIFT;
                x = -x;
        }
        pos |= x << CURSOR_X_SHIFT;

        if (y < 0) {
                pos |= CURSOR_POS_SIGN << CURSOR_Y_SHIFT;
                y = -y;
        }
        pos |= y << CURSOR_Y_SHIFT;

        return pos;
}

static bool intel_cursor_size_ok(const struct intel_plane_state *plane_state)
{
        const struct drm_mode_config *config =
                &plane_state->base.plane->dev->mode_config;
        int width = plane_state->base.crtc_w;
        int height = plane_state->base.crtc_h;

        return width > 0 && width <= config->cursor_width &&
                height > 0 && height <= config->cursor_height;
}

static int intel_cursor_check_surface(struct intel_plane_state *plane_state)
{
        const struct drm_framebuffer *fb = plane_state->base.fb;
        unsigned int rotation = plane_state->base.rotation;
        int src_x, src_y;
        u32 offset;
        int ret;

        intel_fill_fb_ggtt_view(&plane_state->view, fb, rotation);
        plane_state->color_plane[0].stride = intel_fb_pitch(fb, 0, rotation);

        ret = intel_plane_check_stride(plane_state);
        if (ret)
                return ret;

        src_x = plane_state->base.src_x >> 16;
        src_y = plane_state->base.src_y >> 16;

        intel_add_fb_offsets(&src_x, &src_y, plane_state, 0);
        offset = intel_plane_compute_aligned_offset(&src_x, &src_y,
                                                    plane_state, 0);

        if (src_x != 0 || src_y != 0) {
                DRM_DEBUG_KMS("Arbitrary cursor panning not supported\n");
                return -EINVAL;
        }

        plane_state->color_plane[0].offset = offset;

        return 0;
}

static int intel_check_cursor(struct intel_crtc_state *crtc_state,
                              struct intel_plane_state *plane_state)
{
        const struct drm_framebuffer *fb = plane_state->base.fb;
        int ret;

        if (fb && fb->modifier != DRM_FORMAT_MOD_LINEAR) {
                DRM_DEBUG_KMS("cursor cannot be tiled\n");
                return -EINVAL;
        }

        ret = drm_atomic_helper_check_plane_state(&plane_state->base,
                                                  &crtc_state->base,
                                                  DRM_PLANE_HELPER_NO_SCALING,
                                                  DRM_PLANE_HELPER_NO_SCALING,
                                                  true, true);
        if (ret)
                return ret;

        if (!plane_state->base.visible)
                return 0;

        ret = intel_plane_check_src_coordinates(plane_state);
        if (ret)
                return ret;

        ret = intel_cursor_check_surface(plane_state);
        if (ret)
                return ret;

        return 0;
}

static unsigned int
i845_cursor_max_stride(struct intel_plane *plane,
                       u32 pixel_format, u64 modifier,
                       unsigned int rotation)
{
        return 2048;
}

static u32 i845_cursor_ctl(const struct intel_crtc_state *crtc_state,
                           const struct intel_plane_state *plane_state)
{
        return CURSOR_ENABLE |
                CURSOR_GAMMA_ENABLE |
                CURSOR_FORMAT_ARGB |
                CURSOR_STRIDE(plane_state->color_plane[0].stride);
}

static bool i845_cursor_size_ok(const struct intel_plane_state *plane_state)
{
        int width = plane_state->base.crtc_w;

        /*
         * 845g/865g are only limited by the width of their cursors,
         * the height is arbitrary up to the precision of the register.
         */
        return intel_cursor_size_ok(plane_state) && IS_ALIGNED(width, 64);
}

static int i845_check_cursor(struct intel_crtc_state *crtc_state,
                             struct intel_plane_state *plane_state)
{
        const struct drm_framebuffer *fb = plane_state->base.fb;
        int ret;

        ret = intel_check_cursor(crtc_state, plane_state);
        if (ret)
                return ret;

        /* if we want to turn off the cursor ignore width and height */
        if (!fb)
                return 0;

        /* Check for which cursor types we support */
        if (!i845_cursor_size_ok(plane_state)) {
                DRM_DEBUG("Cursor dimension %dx%d not supported\n",
                          plane_state->base.crtc_w,
                          plane_state->base.crtc_h);
                return -EINVAL;
        }

        WARN_ON(plane_state->base.visible &&
                plane_state->color_plane[0].stride != fb->pitches[0]);

        switch (fb->pitches[0]) {
        case 256:
        case 512:
        case 1024:
        case 2048:
                break;
        default:
                DRM_DEBUG_KMS("Invalid cursor stride (%u)\n",
                              fb->pitches[0]);
                return -EINVAL;
        }

        plane_state->ctl = i845_cursor_ctl(crtc_state, plane_state);

        return 0;
}

static void i845_update_cursor(struct intel_plane *plane,
                               const struct intel_crtc_state *crtc_state,
                               const struct intel_plane_state *plane_state)
{
        struct drm_i915_private *dev_priv = to_i915(plane->base.dev);
        u32 cntl = 0, base = 0, pos = 0, size = 0;
        unsigned long irqflags;

        if (plane_state && plane_state->base.visible) {
                unsigned int width = plane_state->base.crtc_w;
                unsigned int height = plane_state->base.crtc_h;

                cntl = plane_state->ctl;
                size = (height << 12) | width;

                base = intel_cursor_base(plane_state);
                pos = intel_cursor_position(plane_state);
        }

        spin_lock_irqsave(&dev_priv->uncore.lock, irqflags);

        /* On these chipsets we can only modify the base/size/stride
         * whilst the cursor is disabled.
         */
        if (plane->cursor.base != base ||
            plane->cursor.size != size ||
            plane->cursor.cntl != cntl) {
                I915_WRITE_FW(CURCNTR(PIPE_A), 0);
                I915_WRITE_FW(CURBASE(PIPE_A), base);
                I915_WRITE_FW(CURSIZE, size);
                I915_WRITE_FW(CURPOS(PIPE_A), pos);
                I915_WRITE_FW(CURCNTR(PIPE_A), cntl);

                plane->cursor.base = base;
                plane->cursor.size = size;
                plane->cursor.cntl = cntl;
        } else {
                I915_WRITE_FW(CURPOS(PIPE_A), pos);
        }

        POSTING_READ_FW(CURCNTR(PIPE_A));

        spin_unlock_irqrestore(&dev_priv->uncore.lock, irqflags);
}

static void i845_disable_cursor(struct intel_plane *plane,
                                struct intel_crtc *crtc)
{
        i845_update_cursor(plane, NULL, NULL);
}

static bool i845_cursor_get_hw_state(struct intel_plane *plane,
                                     enum i915_pipe *pipe)
{
        struct drm_i915_private *dev_priv = to_i915(plane->base.dev);
        enum intel_display_power_domain power_domain;
        bool ret;

        power_domain = POWER_DOMAIN_PIPE(PIPE_A);
        if (!intel_display_power_get_if_enabled(dev_priv, power_domain))
                return false;

        ret = I915_READ(CURCNTR(PIPE_A)) & CURSOR_ENABLE;

        *pipe = PIPE_A;

        intel_display_power_put(dev_priv, power_domain);

        return ret;
}

static unsigned int
i9xx_cursor_max_stride(struct intel_plane *plane,
                       u32 pixel_format, u64 modifier,
                       unsigned int rotation)
{
        return plane->base.dev->mode_config.cursor_width * 4;
}

static u32 i9xx_cursor_ctl(const struct intel_crtc_state *crtc_state,
                           const struct intel_plane_state *plane_state)
{
        struct drm_i915_private *dev_priv =
                to_i915(plane_state->base.plane->dev);
        struct intel_crtc *crtc = to_intel_crtc(crtc_state->base.crtc);
        u32 cntl = 0;

        if (IS_GEN6(dev_priv) || IS_IVYBRIDGE(dev_priv))
                cntl |= MCURSOR_TRICKLE_FEED_DISABLE;

        if (INTEL_GEN(dev_priv) <= 10) {
                cntl |= MCURSOR_GAMMA_ENABLE;

                if (HAS_DDI(dev_priv))
                        cntl |= MCURSOR_PIPE_CSC_ENABLE;
        }

        if (INTEL_GEN(dev_priv) < 5 && !IS_G4X(dev_priv))
                cntl |= MCURSOR_PIPE_SELECT(crtc->pipe);

        switch (plane_state->base.crtc_w) {
        case 64:
                cntl |= MCURSOR_MODE_64_ARGB_AX;
                break;
        case 128:
                cntl |= MCURSOR_MODE_128_ARGB_AX;
                break;
        case 256:
                cntl |= MCURSOR_MODE_256_ARGB_AX;
                break;
        default:
                MISSING_CASE(plane_state->base.crtc_w);
                return 0;
        }

        if (plane_state->base.rotation & DRM_MODE_ROTATE_180)
                cntl |= MCURSOR_ROTATE_180;

        return cntl;
}

static bool i9xx_cursor_size_ok(const struct intel_plane_state *plane_state)
{
        struct drm_i915_private *dev_priv =
                to_i915(plane_state->base.plane->dev);
        int width = plane_state->base.crtc_w;
        int height = plane_state->base.crtc_h;

        if (!intel_cursor_size_ok(plane_state))
                return false;

        /* Cursor width is limited to a few power-of-two sizes */
        switch (width) {
        case 256:
        case 128:
        case 64:
                break;
        default:
                return false;
        }

        /*
         * IVB+ have CUR_FBC_CTL which allows an arbitrary cursor
         * height from 8 lines up to the cursor width, when the
         * cursor is not rotated. Everything else requires square
         * cursors.
         */
        if (HAS_CUR_FBC(dev_priv) &&
            plane_state->base.rotation & DRM_MODE_ROTATE_0) {
                if (height < 8 || height > width)
                        return false;
        } else {
                if (height != width)
                        return false;
        }

        return true;
}

static int i9xx_check_cursor(struct intel_crtc_state *crtc_state,
                             struct intel_plane_state *plane_state)
{
        struct intel_plane *plane = to_intel_plane(plane_state->base.plane);
        struct drm_i915_private *dev_priv = to_i915(plane->base.dev);
        const struct drm_framebuffer *fb = plane_state->base.fb;
        enum i915_pipe pipe = plane->pipe;
        int ret;

        ret = intel_check_cursor(crtc_state, plane_state);
        if (ret)
                return ret;

        /* if we want to turn off the cursor ignore width and height */
        if (!fb)
                return 0;

        /* Check for which cursor types we support */
        if (!i9xx_cursor_size_ok(plane_state)) {
                DRM_DEBUG("Cursor dimension %dx%d not supported\n",
                          plane_state->base.crtc_w,
                          plane_state->base.crtc_h);
                return -EINVAL;
        }

        WARN_ON(plane_state->base.visible &&
                plane_state->color_plane[0].stride != fb->pitches[0]);

        if (fb->pitches[0] != plane_state->base.crtc_w * fb->format->cpp[0]) {
                DRM_DEBUG_KMS("Invalid cursor stride (%u) (cursor width %d)\n",
                              fb->pitches[0], plane_state->base.crtc_w);
                return -EINVAL;
        }

        /*
         * There's something wrong with the cursor on CHV pipe C.
         * If it straddles the left edge of the screen then
         * moving it away from the edge or disabling it often
         * results in a pipe underrun, and often that can lead to
         * dead pipe (constant underrun reported, and it scans
         * out just a solid color). To recover from that, the
         * display power well must be turned off and on again.
         * Refuse the put the cursor into that compromised position.
         */
        if (IS_CHERRYVIEW(dev_priv) && pipe == PIPE_C &&
            plane_state->base.visible && plane_state->base.crtc_x < 0) {
                DRM_DEBUG_KMS("CHV cursor C not allowed to straddle the left screen edge\n");
                return -EINVAL;
        }

        plane_state->ctl = i9xx_cursor_ctl(crtc_state, plane_state);

        return 0;
}

static void i9xx_update_cursor(struct intel_plane *plane,
                               const struct intel_crtc_state *crtc_state,
                               const struct intel_plane_state *plane_state)
{
        struct drm_i915_private *dev_priv = to_i915(plane->base.dev);
        enum i915_pipe pipe = plane->pipe;
        u32 cntl = 0, base = 0, pos = 0, fbc_ctl = 0;
        unsigned long irqflags;

        if (plane_state && plane_state->base.visible) {
                cntl = plane_state->ctl;

                if (plane_state->base.crtc_h != plane_state->base.crtc_w)
                        fbc_ctl = CUR_FBC_CTL_EN | (plane_state->base.crtc_h - 1);

                base = intel_cursor_base(plane_state);
                pos = intel_cursor_position(plane_state);
        }

        spin_lock_irqsave(&dev_priv->uncore.lock, irqflags);

        /*
         * On some platforms writing CURCNTR first will also
         * cause CURPOS to be armed by the CURBASE write.
         * Without the CURCNTR write the CURPOS write would
         * arm itself. Thus we always start the full update
         * with a CURCNTR write.
         *
         * On other platforms CURPOS always requires the
         * CURBASE write to arm the update. Additonally
         * a write to any of the cursor register will cancel
         * an already armed cursor update. Thus leaving out
         * the CURBASE write after CURPOS could lead to a
         * cursor that doesn't appear to move, or even change
         * shape. Thus we always write CURBASE.
         *
         * CURCNTR and CUR_FBC_CTL are always
         * armed by the CURBASE write only.
         */
        if (plane->cursor.base != base ||
            plane->cursor.size != fbc_ctl ||
            plane->cursor.cntl != cntl) {
                I915_WRITE_FW(CURCNTR(pipe), cntl);
                if (HAS_CUR_FBC(dev_priv))
                        I915_WRITE_FW(CUR_FBC_CTL(pipe), fbc_ctl);
                I915_WRITE_FW(CURPOS(pipe), pos);
                I915_WRITE_FW(CURBASE(pipe), base);

                plane->cursor.base = base;
                plane->cursor.size = fbc_ctl;
                plane->cursor.cntl = cntl;
        } else {
                I915_WRITE_FW(CURPOS(pipe), pos);
                I915_WRITE_FW(CURBASE(pipe), base);
        }

        POSTING_READ_FW(CURBASE(pipe));

        spin_unlock_irqrestore(&dev_priv->uncore.lock, irqflags);
}

static void i9xx_disable_cursor(struct intel_plane *plane,
                                struct intel_crtc *crtc)
{
        i9xx_update_cursor(plane, NULL, NULL);
}

static bool i9xx_cursor_get_hw_state(struct intel_plane *plane,
                                     enum i915_pipe *pipe)
{
        struct drm_i915_private *dev_priv = to_i915(plane->base.dev);
        enum intel_display_power_domain power_domain;
        bool ret;
        u32 val;

        /*
         * Not 100% correct for planes that can move between pipes,
         * but that's only the case for gen2-3 which don't have any
         * display power wells.
         */
        power_domain = POWER_DOMAIN_PIPE(plane->pipe);
        if (!intel_display_power_get_if_enabled(dev_priv, power_domain))
                return false;

        val = I915_READ(CURCNTR(plane->pipe));

        ret = val & MCURSOR_MODE;

        if (INTEL_GEN(dev_priv) >= 5 || IS_G4X(dev_priv))
                *pipe = plane->pipe;
        else
                *pipe = (val & MCURSOR_PIPE_SELECT_MASK) >>
                        MCURSOR_PIPE_SELECT_SHIFT;

        intel_display_power_put(dev_priv, power_domain);

        return ret;
}

/* VESA 640x480x72Hz mode to set on the pipe */
static const struct drm_display_mode load_detect_mode = {
        DRM_MODE("640x480", DRM_MODE_TYPE_DEFAULT, 31500, 640, 664,
                 704, 832, 0, 480, 489, 491, 520, 0, DRM_MODE_FLAG_NHSYNC | DRM_MODE_FLAG_NVSYNC),
};

struct drm_framebuffer *
intel_framebuffer_create(struct drm_i915_gem_object *obj,
                         struct drm_mode_fb_cmd2 *mode_cmd)
{
        struct intel_framebuffer *intel_fb;
        int ret;

        intel_fb = kzalloc(sizeof(*intel_fb), GFP_KERNEL);
        if (!intel_fb)
                return ERR_PTR(-ENOMEM);

        ret = intel_framebuffer_init(intel_fb, obj, mode_cmd);
        if (ret)
                goto err;

        return &intel_fb->base;

err:
        kfree(intel_fb);
        return ERR_PTR(ret);
}

static int intel_modeset_disable_planes(struct drm_atomic_state *state,
                                        struct drm_crtc *crtc)
{
        struct drm_plane *plane;
        struct drm_plane_state *plane_state;
        int ret, i;

        ret = drm_atomic_add_affected_planes(state, crtc);
        if (ret)
                return ret;

        for_each_new_plane_in_state(state, plane, plane_state, i) {
                if (plane_state->crtc != crtc)
                        continue;

                ret = drm_atomic_set_crtc_for_plane(plane_state, NULL);
                if (ret)
                        return ret;

                drm_atomic_set_fb_for_plane(plane_state, NULL);
        }

        return 0;
}

int intel_get_load_detect_pipe(struct drm_connector *connector,
                               const struct drm_display_mode *mode,
                               struct intel_load_detect_pipe *old,
                               struct drm_modeset_acquire_ctx *ctx)
{
        struct intel_crtc *intel_crtc;
        struct intel_encoder *intel_encoder =
                intel_attached_encoder(connector);
        struct drm_crtc *possible_crtc;
        struct drm_encoder *encoder = &intel_encoder->base;
        struct drm_crtc *crtc = NULL;
        struct drm_device *dev = encoder->dev;
        struct drm_i915_private *dev_priv = to_i915(dev);
        struct drm_mode_config *config = &dev->mode_config;
        struct drm_atomic_state *state = NULL, *restore_state = NULL;
        struct drm_connector_state *connector_state;
        struct intel_crtc_state *crtc_state;
        int ret, i = -1;

        DRM_DEBUG_KMS("[CONNECTOR:%d:%s], [ENCODER:%d:%s]\n",
                      connector->base.id, connector->name,
                      encoder->base.id, encoder->name);

        old->restore_state = NULL;

        WARN_ON(!drm_modeset_is_locked(&config->connection_mutex));

        /*
         * Algorithm gets a little messy:
         *
         *   - if the connector already has an assigned crtc, use it (but make
         *     sure it's on first)
         *
         *   - try to find the first unused crtc that can drive this connector,
         *     and use that if we find one
         */

        /* See if we already have a CRTC for this connector */
        if (connector->state->crtc) {
                crtc = connector->state->crtc;

                ret = drm_modeset_lock(&crtc->mutex, ctx);
                if (ret)
                        goto fail;

                /* Make sure the crtc and connector are running */
                goto found;
        }

        /* Find an unused one (if possible) */
        for_each_crtc(dev, possible_crtc) {
                i++;
                if (!(encoder->possible_crtcs & (1 << i)))
                        continue;

                ret = drm_modeset_lock(&possible_crtc->mutex, ctx);
                if (ret)
                        goto fail;

                if (possible_crtc->state->enable) {
                        drm_modeset_unlock(&possible_crtc->mutex);
                        continue;
                }

                crtc = possible_crtc;
                break;
        }

        /*
         * If we didn't find an unused CRTC, don't use any.
         */
        if (!crtc) {
                DRM_DEBUG_KMS("no pipe available for load-detect\n");
                ret = -ENODEV;
                goto fail;
        }

found:
        intel_crtc = to_intel_crtc(crtc);

        state = drm_atomic_state_alloc(dev);
        restore_state = drm_atomic_state_alloc(dev);
        if (!state || !restore_state) {
                ret = -ENOMEM;
                goto fail;
        }

        state->acquire_ctx = ctx;
        restore_state->acquire_ctx = ctx;

        connector_state = drm_atomic_get_connector_state(state, connector);
        if (IS_ERR(connector_state)) {
                ret = PTR_ERR(connector_state);
                goto fail;
        }

        ret = drm_atomic_set_crtc_for_connector(connector_state, crtc);
        if (ret)
                goto fail;

        crtc_state = intel_atomic_get_crtc_state(state, intel_crtc);
        if (IS_ERR(crtc_state)) {
                ret = PTR_ERR(crtc_state);
                goto fail;
        }

        crtc_state->base.active = crtc_state->base.enable = true;

        if (!mode)
                mode = &load_detect_mode;

        ret = drm_atomic_set_mode_for_crtc(&crtc_state->base, mode);
        if (ret)
                goto fail;

        ret = intel_modeset_disable_planes(state, crtc);
        if (ret)
                goto fail;

        ret = PTR_ERR_OR_ZERO(drm_atomic_get_connector_state(restore_state, connector));
        if (!ret)
                ret = PTR_ERR_OR_ZERO(drm_atomic_get_crtc_state(restore_state, crtc));
        if (!ret)
                ret = drm_atomic_add_affected_planes(restore_state, crtc);
        if (ret) {
                DRM_DEBUG_KMS("Failed to create a copy of old state to restore: %i\n", ret);
                goto fail;
        }

        ret = drm_atomic_commit(state);
        if (ret) {
                DRM_DEBUG_KMS("failed to set mode on load-detect pipe\n");
                goto fail;
        }

        old->restore_state = restore_state;
        drm_atomic_state_put(state);

        /* let the connector get through one full cycle before testing */
        intel_wait_for_vblank(dev_priv, intel_crtc->pipe);
        return true;

fail:
        if (state) {
                drm_atomic_state_put(state);
                state = NULL;
        }
        if (restore_state) {
                drm_atomic_state_put(restore_state);
                restore_state = NULL;
        }

        if (ret == -EDEADLK)
                return ret;

        return false;
}

void intel_release_load_detect_pipe(struct drm_connector *connector,
                                    struct intel_load_detect_pipe *old,
                                    struct drm_modeset_acquire_ctx *ctx)
{
        struct intel_encoder *intel_encoder =
                intel_attached_encoder(connector);
        struct drm_encoder *encoder = &intel_encoder->base;
        struct drm_atomic_state *state = old->restore_state;
        int ret;

        DRM_DEBUG_KMS("[CONNECTOR:%d:%s], [ENCODER:%d:%s]\n",
                      connector->base.id, connector->name,
                      encoder->base.id, encoder->name);

        if (!state)
                return;

        ret = drm_atomic_helper_commit_duplicated_state(state, ctx);
        if (ret)
                DRM_DEBUG_KMS("Couldn't release load detect pipe: %i\n", ret);
        drm_atomic_state_put(state);
}

static int i9xx_pll_refclk(struct drm_device *dev,
                           const struct intel_crtc_state *pipe_config)
{
        struct drm_i915_private *dev_priv = to_i915(dev);
        u32 dpll = pipe_config->dpll_hw_state.dpll;

        if ((dpll & PLL_REF_INPUT_MASK) == PLLB_REF_INPUT_SPREADSPECTRUMIN)
                return dev_priv->vbt.lvds_ssc_freq;
        else if (HAS_PCH_SPLIT(dev_priv))
                return 120000;
        else if (!IS_GEN2(dev_priv))
                return 96000;
        else
                return 48000;
}

/* Returns the clock of the currently programmed mode of the given pipe. */
static void i9xx_crtc_clock_get(struct intel_crtc *crtc,
                                struct intel_crtc_state *pipe_config)
{
        struct drm_device *dev = crtc->base.dev;
        struct drm_i915_private *dev_priv = to_i915(dev);
        int pipe = pipe_config->cpu_transcoder;
        u32 dpll = pipe_config->dpll_hw_state.dpll;
        u32 fp;
        struct dpll clock;
        int port_clock;
        int refclk = i9xx_pll_refclk(dev, pipe_config);

        if ((dpll & DISPLAY_RATE_SELECT_FPA1) == 0)
                fp = pipe_config->dpll_hw_state.fp0;
        else
                fp = pipe_config->dpll_hw_state.fp1;

        clock.m1 = (fp & FP_M1_DIV_MASK) >> FP_M1_DIV_SHIFT;
        if (IS_PINEVIEW(dev_priv)) {
                clock.n = ffs((fp & FP_N_PINEVIEW_DIV_MASK) >> FP_N_DIV_SHIFT) - 1;
                clock.m2 = (fp & FP_M2_PINEVIEW_DIV_MASK) >> FP_M2_DIV_SHIFT;
        } else {
                clock.n = (fp & FP_N_DIV_MASK) >> FP_N_DIV_SHIFT;
                clock.m2 = (fp & FP_M2_DIV_MASK) >> FP_M2_DIV_SHIFT;
        }

        if (!IS_GEN2(dev_priv)) {
                if (IS_PINEVIEW(dev_priv))
                        clock.p1 = ffs((dpll & DPLL_FPA01_P1_POST_DIV_MASK_PINEVIEW) >>
                                DPLL_FPA01_P1_POST_DIV_SHIFT_PINEVIEW);
                else
                        clock.p1 = ffs((dpll & DPLL_FPA01_P1_POST_DIV_MASK) >>
                               DPLL_FPA01_P1_POST_DIV_SHIFT);

                switch (dpll & DPLL_MODE_MASK) {
                case DPLLB_MODE_DAC_SERIAL:
                        clock.p2 = dpll & DPLL_DAC_SERIAL_P2_CLOCK_DIV_5 ?
                                5 : 10;
                        break;
                case DPLLB_MODE_LVDS:
                        clock.p2 = dpll & DPLLB_LVDS_P2_CLOCK_DIV_7 ?
                                7 : 14;
                        break;
                default:
                        DRM_DEBUG_KMS("Unknown DPLL mode %08x in programmed "
                                  "mode\n", (int)(dpll & DPLL_MODE_MASK));
                        return;
                }

                if (IS_PINEVIEW(dev_priv))
                        port_clock = pnv_calc_dpll_params(refclk, &clock);
                else
                        port_clock = i9xx_calc_dpll_params(refclk, &clock);
        } else {
                u32 lvds = IS_I830(dev_priv) ? 0 : I915_READ(LVDS);
                bool is_lvds = (pipe == 1) && (lvds & LVDS_PORT_EN);

                if (is_lvds) {
                        clock.p1 = ffs((dpll & DPLL_FPA01_P1_POST_DIV_MASK_I830_LVDS) >>
                                       DPLL_FPA01_P1_POST_DIV_SHIFT);

                        if (lvds & LVDS_CLKB_POWER_UP)
                                clock.p2 = 7;
                        else
                                clock.p2 = 14;
                } else {
                        if (dpll & PLL_P1_DIVIDE_BY_TWO)
                                clock.p1 = 2;
                        else {
                                clock.p1 = ((dpll & DPLL_FPA01_P1_POST_DIV_MASK_I830) >>
                                            DPLL_FPA01_P1_POST_DIV_SHIFT) + 2;
                        }
                        if (dpll & PLL_P2_DIVIDE_BY_4)
                                clock.p2 = 4;
                        else
                                clock.p2 = 2;
                }

                port_clock = i9xx_calc_dpll_params(refclk, &clock);
        }

        /*
         * This value includes pixel_multiplier. We will use
         * port_clock to compute adjusted_mode.crtc_clock in the
         * encoder's get_config() function.
         */
        pipe_config->port_clock = port_clock;
}

int intel_dotclock_calculate(int link_freq,
                             const struct intel_link_m_n *m_n)
{
        /*
         * The calculation for the data clock is:
         * pixel_clock = ((m/n)*(link_clock * nr_lanes))/bpp
         * But we want to avoid losing precison if possible, so:
         * pixel_clock = ((m * link_clock * nr_lanes)/(n*bpp))
         *
         * and the link clock is simpler:
         * link_clock = (m * link_clock) / n
         */

        if (!m_n->link_n)
                return 0;

        return div_u64(mul_u32_u32(m_n->link_m, link_freq), m_n->link_n);
}

static void ironlake_pch_clock_get(struct intel_crtc *crtc,
                                   struct intel_crtc_state *pipe_config)
{
        struct drm_i915_private *dev_priv = to_i915(crtc->base.dev);

        /* read out port_clock from the DPLL */
        i9xx_crtc_clock_get(crtc, pipe_config);

        /*
         * In case there is an active pipe without active ports,
         * we may need some idea for the dotclock anyway.
         * Calculate one based on the FDI configuration.
         */
        pipe_config->base.adjusted_mode.crtc_clock =
                intel_dotclock_calculate(intel_fdi_link_freq(dev_priv, pipe_config),
                                         &pipe_config->fdi_m_n);
}

/* Returns the currently programmed mode of the given encoder. */
struct drm_display_mode *
intel_encoder_current_mode(struct intel_encoder *encoder)
{
        struct drm_i915_private *dev_priv = to_i915(encoder->base.dev);
        struct intel_crtc_state *crtc_state;
        struct drm_display_mode *mode;
        struct intel_crtc *crtc;
        enum i915_pipe pipe;

        if (!encoder->get_hw_state(encoder, &pipe))
                return NULL;

        crtc = intel_get_crtc_for_pipe(dev_priv, pipe);

        mode = kzalloc(sizeof(*mode), GFP_KERNEL);
        if (!mode)
                return NULL;

        crtc_state = kzalloc(sizeof(*crtc_state), GFP_KERNEL);
        if (!crtc_state) {
                kfree(mode);
                return NULL;
        }

        crtc_state->base.crtc = &crtc->base;

        if (!dev_priv->display.get_pipe_config(crtc, crtc_state)) {
                kfree(crtc_state);
                kfree(mode);
                return NULL;
        }

        encoder->get_config(encoder, crtc_state);

        intel_mode_from_pipe_config(mode, crtc_state);

        kfree(crtc_state);

        return mode;
}

static void intel_crtc_destroy(struct drm_crtc *crtc)
{
        struct intel_crtc *intel_crtc = to_intel_crtc(crtc);

        drm_crtc_cleanup(crtc);
        kfree(intel_crtc);
}

/**
 * intel_wm_need_update - Check whether watermarks need updating
 * @plane: drm plane
 * @state: new plane state
 *
 * Check current plane state versus the new one to determine whether
 * watermarks need to be recalculated.
 *
 * Returns true or false.
 */
static bool intel_wm_need_update(struct drm_plane *plane,
                                 struct drm_plane_state *state)
{
        struct intel_plane_state *new = to_intel_plane_state(state);
        struct intel_plane_state *cur = to_intel_plane_state(plane->state);

        /* Update watermarks on tiling or size changes. */
        if (new->base.visible != cur->base.visible)
                return true;

        if (!cur->base.fb || !new->base.fb)
                return false;

        if (cur->base.fb->modifier != new->base.fb->modifier ||
            cur->base.rotation != new->base.rotation ||
            drm_rect_width(&new->base.src) != drm_rect_width(&cur->base.src) ||
            drm_rect_height(&new->base.src) != drm_rect_height(&cur->base.src) ||
            drm_rect_width(&new->base.dst) != drm_rect_width(&cur->base.dst) ||
            drm_rect_height(&new->base.dst) != drm_rect_height(&cur->base.dst))
                return true;

        return false;
}

static bool needs_scaling(const struct intel_plane_state *state)
{
        int src_w = drm_rect_width(&state->base.src) >> 16;
        int src_h = drm_rect_height(&state->base.src) >> 16;
        int dst_w = drm_rect_width(&state->base.dst);
        int dst_h = drm_rect_height(&state->base.dst);

        return (src_w != dst_w || src_h != dst_h);
}

int intel_plane_atomic_calc_changes(const struct intel_crtc_state *old_crtc_state,
                                    struct drm_crtc_state *crtc_state,
                                    const struct intel_plane_state *old_plane_state,
                                    struct drm_plane_state *plane_state)
{
        struct intel_crtc_state *pipe_config = to_intel_crtc_state(crtc_state);
        struct drm_crtc *crtc = crtc_state->crtc;
        struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
        struct intel_plane *plane = to_intel_plane(plane_state->plane);
        struct drm_device *dev = crtc->dev;
        struct drm_i915_private *dev_priv = to_i915(dev);
        bool mode_changed = needs_modeset(crtc_state);
        bool was_crtc_enabled = old_crtc_state->base.active;
        bool is_crtc_enabled = crtc_state->active;
        bool turn_off, turn_on, visible, was_visible;
        struct drm_framebuffer *fb = plane_state->fb;
        int ret;

        if (INTEL_GEN(dev_priv) >= 9 && plane->id != PLANE_CURSOR) {
                ret = skl_update_scaler_plane(
                        to_intel_crtc_state(crtc_state),
                        to_intel_plane_state(plane_state));
                if (ret)
                        return ret;
        }

        was_visible = old_plane_state->base.visible;
        visible = plane_state->visible;

        if (!was_crtc_enabled && WARN_ON(was_visible))
                was_visible = false;

        /*
         * Visibility is calculated as if the crtc was on, but
         * after scaler setup everything depends on it being off
         * when the crtc isn't active.
         *
         * FIXME this is wrong for watermarks. Watermarks should also
         * be computed as if the pipe would be active. Perhaps move
         * per-plane wm computation to the .check_plane() hook, and
         * only combine the results from all planes in the current place?
         */
        if (!is_crtc_enabled) {
                plane_state->visible = visible = false;
                to_intel_crtc_state(crtc_state)->active_planes &= ~BIT(plane->id);
        }

        if (!was_visible && !visible)
                return 0;

        if (fb != old_plane_state->base.fb)
                pipe_config->fb_changed = true;

        turn_off = was_visible && (!visible || mode_changed);
        turn_on = visible && (!was_visible || mode_changed);

        DRM_DEBUG_ATOMIC("[CRTC:%d:%s] has [PLANE:%d:%s] with fb %i\n",
                         intel_crtc->base.base.id, intel_crtc->base.name,
                         plane->base.base.id, plane->base.name,
                         fb ? fb->base.id : -1);

        DRM_DEBUG_ATOMIC("[PLANE:%d:%s] visible %i -> %i, off %i, on %i, ms %i\n",
                         plane->base.base.id, plane->base.name,
                         was_visible, visible,
                         turn_off, turn_on, mode_changed);

        if (turn_on) {
                if (INTEL_GEN(dev_priv) < 5 && !IS_G4X(dev_priv))
                        pipe_config->update_wm_pre = true;

                /* must disable cxsr around plane enable/disable */
                if (plane->id != PLANE_CURSOR)
                        pipe_config->disable_cxsr = true;
        } else if (turn_off) {
                if (INTEL_GEN(dev_priv) < 5 && !IS_G4X(dev_priv))
                        pipe_config->update_wm_post = true;

                /* must disable cxsr around plane enable/disable */
                if (plane->id != PLANE_CURSOR)
                        pipe_config->disable_cxsr = true;
        } else if (intel_wm_need_update(&plane->base, plane_state)) {
                if (INTEL_GEN(dev_priv) < 5 && !IS_G4X(dev_priv)) {
                        /* FIXME bollocks */
                        pipe_config->update_wm_pre = true;
                        pipe_config->update_wm_post = true;
                }
        }

        if (visible || was_visible)
                pipe_config->fb_bits |= plane->frontbuffer_bit;

        /*
         * WaCxSRDisabledForSpriteScaling:ivb
         *
         * cstate->update_wm was already set above, so this flag will
         * take effect when we commit and program watermarks.
         */
        if (plane->id == PLANE_SPRITE0 && IS_IVYBRIDGE(dev_priv) &&
            needs_scaling(to_intel_plane_state(plane_state)) &&
            !needs_scaling(old_plane_state))
                pipe_config->disable_lp_wm = true;

        return 0;
}

static bool encoders_cloneable(const struct intel_encoder *a,
                               const struct intel_encoder *b)
{
        /* masks could be asymmetric, so check both ways */
        return a == b || (a->cloneable & (1 << b->type) &&
                          b->cloneable & (1 << a->type));
}

static bool check_single_encoder_cloning(struct drm_atomic_state *state,
                                         struct intel_crtc *crtc,
                                         struct intel_encoder *encoder)
{
        struct intel_encoder *source_encoder;
        struct drm_connector *connector;
        struct drm_connector_state *connector_state;
        int i;

        for_each_new_connector_in_state(state, connector, connector_state, i) {
                if (connector_state->crtc != &crtc->base)
                        continue;

                source_encoder =
                        to_intel_encoder(connector_state->best_encoder);
                if (!encoders_cloneable(encoder, source_encoder))
                        return false;
        }

        return true;
}

static int intel_crtc_atomic_check(struct drm_crtc *crtc,
                                   struct drm_crtc_state *crtc_state)
{
        struct drm_device *dev = crtc->dev;
        struct drm_i915_private *dev_priv = to_i915(dev);
        struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
        struct intel_crtc_state *pipe_config =
                to_intel_crtc_state(crtc_state);
        struct drm_atomic_state *state = crtc_state->state;
        int ret;
        bool mode_changed = needs_modeset(crtc_state);

        if (mode_changed && !crtc_state->active)
                pipe_config->update_wm_post = true;

        if (mode_changed && crtc_state->enable &&
            dev_priv->display.crtc_compute_clock &&
            !WARN_ON(pipe_config->shared_dpll)) {
                ret = dev_priv->display.crtc_compute_clock(intel_crtc,
                                                           pipe_config);
                if (ret)
                        return ret;
        }

        if (crtc_state->color_mgmt_changed) {
                ret = intel_color_check(crtc, crtc_state);
                if (ret)
                        return ret;

                /*
                 * Changing color management on Intel hardware is
                 * handled as part of planes update.
                 */
                crtc_state->planes_changed = true;
        }

        ret = 0;
        if (dev_priv->display.compute_pipe_wm) {
                ret = dev_priv->display.compute_pipe_wm(pipe_config);
                if (ret) {
                        DRM_DEBUG_KMS("Target pipe watermarks are invalid\n");
                        return ret;
                }
        }

        if (dev_priv->display.compute_intermediate_wm &&
            !to_intel_atomic_state(state)->skip_intermediate_wm) {
                if (WARN_ON(!dev_priv->display.compute_pipe_wm))
                        return 0;

                /*
                 * Calculate 'intermediate' watermarks that satisfy both the
                 * old state and the new state.  We can program these
                 * immediately.
                 */
                ret = dev_priv->display.compute_intermediate_wm(dev,
                                                                intel_crtc,
                                                                pipe_config);
                if (ret) {
                        DRM_DEBUG_KMS("No valid intermediate pipe watermarks are possible\n");
                        return ret;
                }
        } else if (dev_priv->display.compute_intermediate_wm) {
                if (HAS_PCH_SPLIT(dev_priv) && INTEL_GEN(dev_priv) < 9)
                        pipe_config->wm.ilk.intermediate = pipe_config->wm.ilk.optimal;
        }

        if (INTEL_GEN(dev_priv) >= 9) {
                if (mode_changed)
                        ret = skl_update_scaler_crtc(pipe_config);

                if (!ret)
                        ret = skl_check_pipe_max_pixel_rate(intel_crtc,
                                                            pipe_config);
                if (!ret)
                        ret = intel_atomic_setup_scalers(dev_priv, intel_crtc,
                                                         pipe_config);
        }

        if (HAS_IPS(dev_priv))
                pipe_config->ips_enabled = hsw_compute_ips_config(pipe_config);

        return ret;
}

static const struct drm_crtc_helper_funcs intel_helper_funcs = {
        .atomic_begin = intel_begin_crtc_commit,
        .atomic_flush = intel_finish_crtc_commit,
        .atomic_check = intel_crtc_atomic_check,
};

static void intel_modeset_update_connector_atomic_state(struct drm_device *dev)
{
        struct intel_connector *connector;
        struct drm_connector_list_iter conn_iter;

        drm_connector_list_iter_begin(dev, &conn_iter);
        for_each_intel_connector_iter(connector, &conn_iter) {
                if (connector->base.state->crtc)
                        drm_connector_put(&connector->base);

                if (connector->base.encoder) {
                        connector->base.state->best_encoder =
                                connector->base.encoder;
                        connector->base.state->crtc =
                                connector->base.encoder->crtc;

                        drm_connector_get(&connector->base);
                } else {
                        connector->base.state->best_encoder = NULL;
                        connector->base.state->crtc = NULL;
                }
        }
        drm_connector_list_iter_end(&conn_iter);
}

static void
connected_sink_compute_bpp(struct intel_connector *connector,
                           struct intel_crtc_state *pipe_config)
{
        const struct drm_display_info *info = &connector->base.display_info;
        int bpp = pipe_config->pipe_bpp;

        DRM_DEBUG_KMS("[CONNECTOR:%d:%s] checking for sink bpp constrains\n",
                      connector->base.base.id,
                      connector->base.name);

        /* Don't use an invalid EDID bpc value */
        if (info->bpc != 0 && info->bpc * 3 < bpp) {
                DRM_DEBUG_KMS("clamping display bpp (was %d) to EDID reported max of %d\n",
                              bpp, info->bpc * 3);
                pipe_config->pipe_bpp = info->bpc * 3;
        }

        /* Clamp bpp to 8 on screens without EDID 1.4 */
        if (info->bpc == 0 && bpp > 24) {
                DRM_DEBUG_KMS("clamping display bpp (was %d) to default limit of 24\n",
                              bpp);
                pipe_config->pipe_bpp = 24;
        }
}

static int
compute_baseline_pipe_bpp(struct intel_crtc *crtc,
                          struct intel_crtc_state *pipe_config)
{
        struct drm_i915_private *dev_priv = to_i915(crtc->base.dev);
        struct drm_atomic_state *state;
        struct drm_connector *connector;
        struct drm_connector_state *connector_state;
        int bpp, i;

        if ((IS_G4X(dev_priv) || IS_VALLEYVIEW(dev_priv) ||
            IS_CHERRYVIEW(dev_priv)))
                bpp = 10*3;
        else if (INTEL_GEN(dev_priv) >= 5)
                bpp = 12*3;
        else
                bpp = 8*3;


        pipe_config->pipe_bpp = bpp;

        state = pipe_config->base.state;

        /* Clamp display bpp to EDID value */
        for_each_new_connector_in_state(state, connector, connector_state, i) {
                if (connector_state->crtc != &crtc->base)
                        continue;

                connected_sink_compute_bpp(to_intel_connector(connector),
                                           pipe_config);
        }

        return bpp;
}

static void intel_dump_crtc_timings(const struct drm_display_mode *mode)
{
        DRM_DEBUG_KMS("crtc timings: %d %d %d %d %d %d %d %d %d, "
                        "type: 0x%x flags: 0x%x\n",
                mode->crtc_clock,
                mode->crtc_hdisplay, mode->crtc_hsync_start,
                mode->crtc_hsync_end, mode->crtc_htotal,
                mode->crtc_vdisplay, mode->crtc_vsync_start,
                mode->crtc_vsync_end, mode->crtc_vtotal, mode->type, mode->flags);
}

static inline void
intel_dump_m_n_config(struct intel_crtc_state *pipe_config, char *id,
                      unsigned int lane_count, struct intel_link_m_n *m_n)
{
        DRM_DEBUG_KMS("%s: lanes: %i; gmch_m: %u, gmch_n: %u, link_m: %u, link_n: %u, tu: %u\n",
                      id, lane_count,
                      m_n->gmch_m, m_n->gmch_n,
                      m_n->link_m, m_n->link_n, m_n->tu);
}

#define OUTPUT_TYPE(x) [INTEL_OUTPUT_ ## x] = #x

static const char * const output_type_str[] = {
        OUTPUT_TYPE(UNUSED),
        OUTPUT_TYPE(ANALOG),
        OUTPUT_TYPE(DVO),
        OUTPUT_TYPE(SDVO),
        OUTPUT_TYPE(LVDS),
        OUTPUT_TYPE(TVOUT),
        OUTPUT_TYPE(HDMI),
        OUTPUT_TYPE(DP),
        OUTPUT_TYPE(EDP),
        OUTPUT_TYPE(DSI),
        OUTPUT_TYPE(DDI),
        OUTPUT_TYPE(DP_MST),
};

#undef OUTPUT_TYPE

static void snprintf_output_types(char *buf, size_t len,
                                  unsigned int output_types)
{
        char *str = buf;
        int i;

        str[0] = '\0';

        for (i = 0; i < ARRAY_SIZE(output_type_str); i++) {
                int r;

                if ((output_types & BIT(i)) == 0)
                        continue;

                r = snprintf(str, len, "%s%s",
                             str != buf ? "," : "", output_type_str[i]);
                if (r >= len)
                        break;
                str += r;
                len -= r;

                output_types &= ~BIT(i);
        }

        WARN_ON_ONCE(output_types != 0);
}

static void intel_dump_pipe_config(struct intel_crtc *crtc,
                                   struct intel_crtc_state *pipe_config,
                                   const char *context)
{
        struct drm_device *dev = crtc->base.dev;
        struct drm_i915_private *dev_priv = to_i915(dev);
        struct drm_plane *plane;
        struct intel_plane *intel_plane;
        struct intel_plane_state *state;
        struct drm_framebuffer *fb;
        char buf[64];

        DRM_DEBUG_KMS("[CRTC:%d:%s]%s\n",
                      crtc->base.base.id, crtc->base.name, context);

        snprintf_output_types(buf, sizeof(buf), pipe_config->output_types);
        DRM_DEBUG_KMS("output_types: %s (0x%x)\n",
                      buf, pipe_config->output_types);

        DRM_DEBUG_KMS("cpu_transcoder: %s, pipe bpp: %i, dithering: %i\n",
                      transcoder_name(pipe_config->cpu_transcoder),
                      pipe_config->pipe_bpp, pipe_config->dither);

        if (pipe_config->has_pch_encoder)
                intel_dump_m_n_config(pipe_config, "fdi",
                                      pipe_config->fdi_lanes,
                                      &pipe_config->fdi_m_n);

        if (pipe_config->ycbcr420)
                DRM_DEBUG_KMS("YCbCr 4:2:0 output enabled\n");

        if (intel_crtc_has_dp_encoder(pipe_config)) {
                intel_dump_m_n_config(pipe_config, "dp m_n",
                                pipe_config->lane_count, &pipe_config->dp_m_n);
                if (pipe_config->has_drrs)
                        intel_dump_m_n_config(pipe_config, "dp m2_n2",
                                              pipe_config->lane_count,
                                              &pipe_config->dp_m2_n2);
        }

        DRM_DEBUG_KMS("audio: %i, infoframes: %i\n",
                      pipe_config->has_audio, pipe_config->has_infoframe);

        DRM_DEBUG_KMS("requested mode:\n");
        drm_mode_debug_printmodeline(&pipe_config->base.mode);
        DRM_DEBUG_KMS("adjusted mode:\n");
        drm_mode_debug_printmodeline(&pipe_config->base.adjusted_mode);
        intel_dump_crtc_timings(&pipe_config->base.adjusted_mode);
        DRM_DEBUG_KMS("port clock: %d, pipe src size: %dx%d, pixel rate %d\n",
                      pipe_config->port_clock,
                      pipe_config->pipe_src_w, pipe_config->pipe_src_h,
                      pipe_config->pixel_rate);

        if (INTEL_GEN(dev_priv) >= 9)
                DRM_DEBUG_KMS("num_scalers: %d, scaler_users: 0x%x, scaler_id: %d\n",
                              crtc->num_scalers,
                              pipe_config->scaler_state.scaler_users,
                              pipe_config->scaler_state.scaler_id);

        if (HAS_GMCH_DISPLAY(dev_priv))
                DRM_DEBUG_KMS("gmch pfit: control: 0x%08x, ratios: 0x%08x, lvds border: 0x%08x\n",
                              pipe_config->gmch_pfit.control,
                              pipe_config->gmch_pfit.pgm_ratios,
                              pipe_config->gmch_pfit.lvds_border_bits);
        else
                DRM_DEBUG_KMS("pch pfit: pos: 0x%08x, size: 0x%08x, %s\n",
                              pipe_config->pch_pfit.pos,
                              pipe_config->pch_pfit.size,
                              enableddisabled(pipe_config->pch_pfit.enabled));

        DRM_DEBUG_KMS("ips: %i, double wide: %i\n",
                      pipe_config->ips_enabled, pipe_config->double_wide);

        intel_dpll_dump_hw_state(dev_priv, &pipe_config->dpll_hw_state);

        DRM_DEBUG_KMS("planes on this crtc\n");
        list_for_each_entry(plane, &dev->mode_config.plane_list, head) {
                struct drm_format_name_buf format_name;
                intel_plane = to_intel_plane(plane);
                if (intel_plane->pipe != crtc->pipe)
                        continue;

                state = to_intel_plane_state(plane->state);
                fb = state->base.fb;
                if (!fb) {
                        DRM_DEBUG_KMS("[PLANE:%d:%s] disabled, scaler_id = %d\n",
                                      plane->base.id, plane->name, state->scaler_id);
                        continue;
                }

                DRM_DEBUG_KMS("[PLANE:%d:%s] FB:%d, fb = %ux%u format = %s\n",
                              plane->base.id, plane->name,
                              fb->base.id, fb->width, fb->height,
                              drm_get_format_name(fb->format->format, &format_name));
                if (INTEL_GEN(dev_priv) >= 9)
                        DRM_DEBUG_KMS("\tscaler:%d src %dx%d+%d+%d dst %dx%d+%d+%d\n",
                                      state->scaler_id,
                                      state->base.src.x1 >> 16,
                                      state->base.src.y1 >> 16,
                                      drm_rect_width(&state->base.src) >> 16,
                                      drm_rect_height(&state->base.src) >> 16,
                                      state->base.dst.x1, state->base.dst.y1,
                                      drm_rect_width(&state->base.dst),
                                      drm_rect_height(&state->base.dst));
        }
}

static bool check_digital_port_conflicts(struct drm_atomic_state *state)
{
        struct drm_device *dev = state->dev;
        struct drm_connector *connector;
        struct drm_connector_list_iter conn_iter;
        unsigned int used_ports = 0;
        unsigned int used_mst_ports = 0;
        bool ret = true;

        /*
         * Walk the connector list instead of the encoder
         * list to detect the problem on ddi platforms
         * where there's just one encoder per digital port.
         */
        drm_connector_list_iter_begin(dev, &conn_iter);
        drm_for_each_connector_iter(connector, &conn_iter) {
                struct drm_connector_state *connector_state;
                struct intel_encoder *encoder;

                connector_state = drm_atomic_get_new_connector_state(state, connector);
                if (!connector_state)
                        connector_state = connector->state;

                if (!connector_state->best_encoder)
                        continue;

                encoder = to_intel_encoder(connector_state->best_encoder);

                WARN_ON(!connector_state->crtc);

                switch (encoder->type) {
                        unsigned int port_mask;
                case INTEL_OUTPUT_DDI:
                        if (WARN_ON(!HAS_DDI(to_i915(dev))))
                                break;
                        /* else: fall through */
                case INTEL_OUTPUT_DP:
                case INTEL_OUTPUT_HDMI:
                case INTEL_OUTPUT_EDP:
                        port_mask = 1 << encoder->port;

                        /* the same port mustn't appear more than once */
                        if (used_ports & port_mask)
                                ret = false;

                        used_ports |= port_mask;
                        break;
                case INTEL_OUTPUT_DP_MST:
                        used_mst_ports |=
                                1 << encoder->port;
                        break;
                default:
                        break;
                }
        }
        drm_connector_list_iter_end(&conn_iter);

        /* can't mix MST and SST/HDMI on the same port */
        if (used_ports & used_mst_ports)
                return false;

        return ret;
}

static void
clear_intel_crtc_state(struct intel_crtc_state *crtc_state)
{
        struct drm_i915_private *dev_priv =
                to_i915(crtc_state->base.crtc->dev);
        struct intel_crtc_scaler_state scaler_state;
        struct intel_dpll_hw_state dpll_hw_state;
        struct intel_shared_dpll *shared_dpll;
        struct intel_crtc_wm_state wm_state;
        bool force_thru, ips_force_disable;

        /* FIXME: before the switch to atomic started, a new pipe_config was
         * kzalloc'd. Code that depends on any field being zero should be
         * fixed, so that the crtc_state can be safely duplicated. For now,
         * only fields that are know to not cause problems are preserved. */

        scaler_state = crtc_state->scaler_state;
        shared_dpll = crtc_state->shared_dpll;
        dpll_hw_state = crtc_state->dpll_hw_state;
        force_thru = crtc_state->pch_pfit.force_thru;
        ips_force_disable = crtc_state->ips_force_disable;
        if (IS_G4X(dev_priv) ||
            IS_VALLEYVIEW(dev_priv) || IS_CHERRYVIEW(dev_priv))
                wm_state = crtc_state->wm;

        /* Keep base drm_crtc_state intact, only clear our extended struct */
        BUILD_BUG_ON(offsetof(struct intel_crtc_state, base));
        memset(&crtc_state->base + 1, 0,
               sizeof(*crtc_state) - sizeof(crtc_state->base));

        crtc_state->scaler_state = scaler_state;
        crtc_state->shared_dpll = shared_dpll;
        crtc_state->dpll_hw_state = dpll_hw_state;
        crtc_state->pch_pfit.force_thru = force_thru;
        crtc_state->ips_force_disable = ips_force_disable;
        if (IS_G4X(dev_priv) ||
            IS_VALLEYVIEW(dev_priv) || IS_CHERRYVIEW(dev_priv))
                crtc_state->wm = wm_state;
}

static int
intel_modeset_pipe_config(struct drm_crtc *crtc,
                          struct intel_crtc_state *pipe_config)
{
        struct drm_atomic_state *state = pipe_config->base.state;
        struct intel_encoder *encoder;
        struct drm_connector *connector;
        struct drm_connector_state *connector_state;
        int base_bpp, ret = -EINVAL;
        int i;
        bool retry = true;

        clear_intel_crtc_state(pipe_config);

        pipe_config->cpu_transcoder =
                (enum transcoder) to_intel_crtc(crtc)->pipe;

        /*
         * Sanitize sync polarity flags based on requested ones. If neither
         * positive or negative polarity is requested, treat this as meaning
         * negative polarity.
         */
        if (!(pipe_config->base.adjusted_mode.flags &
              (DRM_MODE_FLAG_PHSYNC | DRM_MODE_FLAG_NHSYNC)))
                pipe_config->base.adjusted_mode.flags |= DRM_MODE_FLAG_NHSYNC;

        if (!(pipe_config->base.adjusted_mode.flags &
              (DRM_MODE_FLAG_PVSYNC | DRM_MODE_FLAG_NVSYNC)))
                pipe_config->base.adjusted_mode.flags |= DRM_MODE_FLAG_NVSYNC;

        base_bpp = compute_baseline_pipe_bpp(to_intel_crtc(crtc),
                                             pipe_config);
        if (base_bpp < 0)
                goto fail;

        /*
         * Determine the real pipe dimensions. Note that stereo modes can
         * increase the actual pipe size due to the frame doubling and
         * insertion of additional space for blanks between the frame. This
         * is stored in the crtc timings. We use the requested mode to do this
         * computation to clearly distinguish it from the adjusted mode, which
         * can be changed by the connectors in the below retry loop.
         */
        drm_mode_get_hv_timing(&pipe_config->base.mode,
                               &pipe_config->pipe_src_w,
                               &pipe_config->pipe_src_h);

        for_each_new_connector_in_state(state, connector, connector_state, i) {
                if (connector_state->crtc != crtc)
                        continue;

                encoder = to_intel_encoder(connector_state->best_encoder);

                if (!check_single_encoder_cloning(state, to_intel_crtc(crtc), encoder)) {
                        DRM_DEBUG_KMS("rejecting invalid cloning configuration\n");
                        goto fail;
                }

                /*
                 * Determine output_types before calling the .compute_config()
                 * hooks so that the hooks can use this information safely.
                 */
                if (encoder->compute_output_type)
                        pipe_config->output_types |=
                                BIT(encoder->compute_output_type(encoder, pipe_config,
                                                                 connector_state));
                else
                        pipe_config->output_types |= BIT(encoder->type);
        }

encoder_retry:
        /* Ensure the port clock defaults are reset when retrying. */
        pipe_config->port_clock = 0;
        pipe_config->pixel_multiplier = 1;

        /* Fill in default crtc timings, allow encoders to overwrite them. */
        drm_mode_set_crtcinfo(&pipe_config->base.adjusted_mode,
                              CRTC_STEREO_DOUBLE);

        /* Pass our mode to the connectors and the CRTC to give them a chance to
         * adjust it according to limitations or connector properties, and also
         * a chance to reject the mode entirely.
         */
        for_each_new_connector_in_state(state, connector, connector_state, i) {
                if (connector_state->crtc != crtc)
                        continue;

                encoder = to_intel_encoder(connector_state->best_encoder);

                if (!(encoder->compute_config(encoder, pipe_config, connector_state))) {
                        DRM_DEBUG_KMS("Encoder config failure\n");
                        goto fail;
                }
        }

        /* Set default port clock if not overwritten by the encoder. Needs to be
         * done afterwards in case the encoder adjusts the mode. */
        if (!pipe_config->port_clock)
                pipe_config->port_clock = pipe_config->base.adjusted_mode.crtc_clock
                        * pipe_config->pixel_multiplier;

        ret = intel_crtc_compute_config(to_intel_crtc(crtc), pipe_config);
        if (ret < 0) {
                DRM_DEBUG_KMS("CRTC fixup failed\n");
                goto fail;
        }

        if (ret == RETRY) {
                if (WARN(!retry, "loop in pipe configuration computation\n")) {
                        ret = -EINVAL;
                        goto fail;
                }

                DRM_DEBUG_KMS("CRTC bw constrained, retrying\n");
                retry = false;
                goto encoder_retry;
        }

        /* Dithering seems to not pass-through bits correctly when it should, so
         * only enable it on 6bpc panels and when its not a compliance
         * test requesting 6bpc video pattern.
         */
        pipe_config->dither = (pipe_config->pipe_bpp == 6*3) &&
                !pipe_config->dither_force_disable;
        DRM_DEBUG_KMS("hw max bpp: %i, pipe bpp: %i, dithering: %i\n",
                      base_bpp, pipe_config->pipe_bpp, pipe_config->dither);

fail:
        return ret;
}

static bool intel_fuzzy_clock_check(int clock1, int clock2)
{
        int diff;

        if (clock1 == clock2)
                return true;

        if (!clock1 || !clock2)
                return false;

        diff = abs(clock1 - clock2);

        if (((((diff + clock1 + clock2) * 100)) / (clock1 + clock2)) < 105)
                return true;

        return false;
}

static bool
intel_compare_m_n(unsigned int m, unsigned int n,
                  unsigned int m2, unsigned int n2,
                  bool exact)
{
        if (m == m2 && n == n2)
                return true;

        if (exact || !m || !n || !m2 || !n2)
                return false;

        BUILD_BUG_ON(DATA_LINK_M_N_MASK > INT_MAX);

        if (n > n2) {
                while (n > n2) {
                        m2 <<= 1;
                        n2 <<= 1;
                }
        } else if (n < n2) {
                while (n < n2) {
                        m <<= 1;
                        n <<= 1;
                }
        }

        if (n != n2)
                return false;

        return intel_fuzzy_clock_check(m, m2);
}

static bool
intel_compare_link_m_n(const struct intel_link_m_n *m_n,
                       struct intel_link_m_n *m2_n2,
                       bool adjust)
{
        if (m_n->tu == m2_n2->tu &&
            intel_compare_m_n(m_n->gmch_m, m_n->gmch_n,
                              m2_n2->gmch_m, m2_n2->gmch_n, !adjust) &&
            intel_compare_m_n(m_n->link_m, m_n->link_n,
                              m2_n2->link_m, m2_n2->link_n, !adjust)) {
                if (adjust)
                        *m2_n2 = *m_n;

                return true;
        }

        return false;
}

static void __printf(3, 4)
pipe_config_err(bool adjust, const char *name, const char *format, ...)
{
        struct va_format vaf;
        va_list args;

        va_start(args, format);
        vaf.fmt = format;
        vaf.va = &args;

        if (adjust)
                /* drm_dbg uses slightly different signature on DragonFly */
                DRM_DEBUG_KMS("mismatch in %s %pV", name, &vaf);
        else
                /* drm_err uses slightly different signature on DragonFly */
                DRM_ERROR("mismatch in %s %pV", name, &vaf);

        va_end(args);
}

static bool
intel_pipe_config_compare(struct drm_i915_private *dev_priv,
                          struct intel_crtc_state *current_config,
                          struct intel_crtc_state *pipe_config,
                          bool adjust)
{
        bool ret = true;
        bool fixup_inherited = adjust &&
                (current_config->base.mode.private_flags & I915_MODE_FLAG_INHERITED) &&
                !(pipe_config->base.mode.private_flags & I915_MODE_FLAG_INHERITED);

#define PIPE_CONF_CHECK_X(name) do { \
        if (current_config->name != pipe_config->name) { \
                pipe_config_err(adjust, __stringify(name), \
                          "(expected 0x%08x, found 0x%08x)\n", \
                          current_config->name, \
                          pipe_config->name); \
                ret = false; \
        } \
} while (0)

#define PIPE_CONF_CHECK_I(name) do { \
        if (current_config->name != pipe_config->name) { \
                pipe_config_err(adjust, __stringify(name), \
                          "(expected %i, found %i)\n", \
                          current_config->name, \
                          pipe_config->name); \
                ret = false; \
        } \
} while (0)

#define PIPE_CONF_CHECK_BOOL(name) do { \
        if (current_config->name != pipe_config->name) { \
                pipe_config_err(adjust, __stringify(name), \
                          "(expected %s, found %s)\n", \
                          yesno(current_config->name), \
                          yesno(pipe_config->name)); \
                ret = false; \
        } \
} while (0)

/*
 * Checks state where we only read out the enabling, but not the entire
 * state itself (like full infoframes or ELD for audio). These states
 * require a full modeset on bootup to fix up.
 */
#define PIPE_CONF_CHECK_BOOL_INCOMPLETE(name) do { \
        if (!fixup_inherited || (!current_config->name && !pipe_config->name)) { \
                PIPE_CONF_CHECK_BOOL(name); \
        } else { \
                pipe_config_err(adjust, __stringify(name), \
                          "unable to verify whether state matches exactly, forcing modeset (expected %s, found %s)\n", \
                          yesno(current_config->name), \
                          yesno(pipe_config->name)); \
                ret = false; \
        } \
} while (0)

#define PIPE_CONF_CHECK_P(name) do { \
        if (current_config->name != pipe_config->name) { \
                pipe_config_err(adjust, __stringify(name), \
                          "(expected %p, found %p)\n", \
                          current_config->name, \
                          pipe_config->name); \
                ret = false; \
        } \
} while (0)

#define PIPE_CONF_CHECK_M_N(name) do { \
        if (!intel_compare_link_m_n(&current_config->name, \
                                    &pipe_config->name,\
                                    adjust)) { \
                pipe_config_err(adjust, __stringify(name), \
                          "(expected tu %i gmch %i/%i link %i/%i, " \
                          "found tu %i, gmch %i/%i link %i/%i)\n", \
                          current_config->name.tu, \
                          current_config->name.gmch_m, \
                          current_config->name.gmch_n, \
                          current_config->name.link_m, \
                          current_config->name.link_n, \
                          pipe_config->name.tu, \
                          pipe_config->name.gmch_m, \
                          pipe_config->name.gmch_n, \
                          pipe_config->name.link_m, \
                          pipe_config->name.link_n); \
                ret = false; \
        } \
} while (0)

/* This is required for BDW+ where there is only one set of registers for
 * switching between high and low RR.
 * This macro can be used whenever a comparison has to be made between one
 * hw state and multiple sw state variables.
 */
#define PIPE_CONF_CHECK_M_N_ALT(name, alt_name) do { \
        if (!intel_compare_link_m_n(&current_config->name, \
                                    &pipe_config->name, adjust) && \
            !intel_compare_link_m_n(&current_config->alt_name, \
                                    &pipe_config->name, adjust)) { \
                pipe_config_err(adjust, __stringify(name), \
                          "(expected tu %i gmch %i/%i link %i/%i, " \
                          "or tu %i gmch %i/%i link %i/%i, " \
                          "found tu %i, gmch %i/%i link %i/%i)\n", \
                          current_config->name.tu, \
                          current_config->name.gmch_m, \
                          current_config->name.gmch_n, \
                          current_config->name.link_m, \
                          current_config->name.link_n, \
                          current_config->alt_name.tu, \
                          current_config->alt_name.gmch_m, \
                          current_config->alt_name.gmch_n, \
                          current_config->alt_name.link_m, \
                          current_config->alt_name.link_n, \
                          pipe_config->name.tu, \
                          pipe_config->name.gmch_m, \
                          pipe_config->name.gmch_n, \
                          pipe_config->name.link_m, \
                          pipe_config->name.link_n); \
                ret = false; \
        } \
} while (0)

#define PIPE_CONF_CHECK_FLAGS(name, mask) do { \
        if ((current_config->name ^ pipe_config->name) & (mask)) { \
                pipe_config_err(adjust, __stringify(name), \
                          "(%x) (expected %i, found %i)\n", \
                          (mask), \
                          current_config->name & (mask), \
                          pipe_config->name & (mask)); \
                ret = false; \
        } \
} while (0)

#define PIPE_CONF_CHECK_CLOCK_FUZZY(name) do { \
        if (!intel_fuzzy_clock_check(current_config->name, pipe_config->name)) { \
                pipe_config_err(adjust, __stringify(name), \
                          "(expected %i, found %i)\n", \
                          current_config->name, \
                          pipe_config->name); \
                ret = false; \
        } \
} while (0)

#define PIPE_CONF_QUIRK(quirk)  \
        ((current_config->quirks | pipe_config->quirks) & (quirk))

        PIPE_CONF_CHECK_I(cpu_transcoder);

        PIPE_CONF_CHECK_BOOL(has_pch_encoder);
        PIPE_CONF_CHECK_I(fdi_lanes);
        PIPE_CONF_CHECK_M_N(fdi_m_n);

        PIPE_CONF_CHECK_I(lane_count);
        PIPE_CONF_CHECK_X(lane_lat_optim_mask);

        if (INTEL_GEN(dev_priv) < 8) {
                PIPE_CONF_CHECK_M_N(dp_m_n);

                if (current_config->has_drrs)
                        PIPE_CONF_CHECK_M_N(dp_m2_n2);
        } else
                PIPE_CONF_CHECK_M_N_ALT(dp_m_n, dp_m2_n2);

        PIPE_CONF_CHECK_X(output_types);

        PIPE_CONF_CHECK_I(base.adjusted_mode.crtc_hdisplay);
        PIPE_CONF_CHECK_I(base.adjusted_mode.crtc_htotal);
        PIPE_CONF_CHECK_I(base.adjusted_mode.crtc_hblank_start);
        PIPE_CONF_CHECK_I(base.adjusted_mode.crtc_hblank_end);
        PIPE_CONF_CHECK_I(base.adjusted_mode.crtc_hsync_start);
        PIPE_CONF_CHECK_I(base.adjusted_mode.crtc_hsync_end);

        PIPE_CONF_CHECK_I(base.adjusted_mode.crtc_vdisplay);
        PIPE_CONF_CHECK_I(base.adjusted_mode.crtc_vtotal);
        PIPE_CONF_CHECK_I(base.adjusted_mode.crtc_vblank_start);
        PIPE_CONF_CHECK_I(base.adjusted_mode.crtc_vblank_end);
        PIPE_CONF_CHECK_I(base.adjusted_mode.crtc_vsync_start);
        PIPE_CONF_CHECK_I(base.adjusted_mode.crtc_vsync_end);

        PIPE_CONF_CHECK_I(pixel_multiplier);
        PIPE_CONF_CHECK_BOOL(has_hdmi_sink);
        if ((INTEL_GEN(dev_priv) < 8 && !IS_HASWELL(dev_priv)) ||
            IS_VALLEYVIEW(dev_priv) || IS_CHERRYVIEW(dev_priv))
                PIPE_CONF_CHECK_BOOL(limited_color_range);

        PIPE_CONF_CHECK_BOOL(hdmi_scrambling);
        PIPE_CONF_CHECK_BOOL(hdmi_high_tmds_clock_ratio);
        PIPE_CONF_CHECK_BOOL_INCOMPLETE(has_infoframe);
        PIPE_CONF_CHECK_BOOL(ycbcr420);

        PIPE_CONF_CHECK_BOOL_INCOMPLETE(has_audio);

        PIPE_CONF_CHECK_FLAGS(base.adjusted_mode.flags,
                              DRM_MODE_FLAG_INTERLACE);

        if (!PIPE_CONF_QUIRK(PIPE_CONFIG_QUIRK_MODE_SYNC_FLAGS)) {
                PIPE_CONF_CHECK_FLAGS(base.adjusted_mode.flags,
                                      DRM_MODE_FLAG_PHSYNC);
                PIPE_CONF_CHECK_FLAGS(base.adjusted_mode.flags,
                                      DRM_MODE_FLAG_NHSYNC);
                PIPE_CONF_CHECK_FLAGS(base.adjusted_mode.flags,
                                      DRM_MODE_FLAG_PVSYNC);
                PIPE_CONF_CHECK_FLAGS(base.adjusted_mode.flags,
                                      DRM_MODE_FLAG_NVSYNC);
        }

        PIPE_CONF_CHECK_X(gmch_pfit.control);
        /* pfit ratios are autocomputed by the hw on gen4+ */
        if (INTEL_GEN(dev_priv) < 4)
                PIPE_CONF_CHECK_X(gmch_pfit.pgm_ratios);
        PIPE_CONF_CHECK_X(gmch_pfit.lvds_border_bits);

        if (!adjust) {
                PIPE_CONF_CHECK_I(pipe_src_w);
                PIPE_CONF_CHECK_I(pipe_src_h);

                PIPE_CONF_CHECK_BOOL(pch_pfit.enabled);
                if (current_config->pch_pfit.enabled) {
                        PIPE_CONF_CHECK_X(pch_pfit.pos);
                        PIPE_CONF_CHECK_X(pch_pfit.size);
                }

                PIPE_CONF_CHECK_I(scaler_state.scaler_id);
                PIPE_CONF_CHECK_CLOCK_FUZZY(pixel_rate);
        }

        PIPE_CONF_CHECK_BOOL(double_wide);

        PIPE_CONF_CHECK_P(shared_dpll);
        PIPE_CONF_CHECK_X(dpll_hw_state.dpll);
        PIPE_CONF_CHECK_X(dpll_hw_state.dpll_md);
        PIPE_CONF_CHECK_X(dpll_hw_state.fp0);
        PIPE_CONF_CHECK_X(dpll_hw_state.fp1);
        PIPE_CONF_CHECK_X(dpll_hw_state.wrpll);
        PIPE_CONF_CHECK_X(dpll_hw_state.spll);
        PIPE_CONF_CHECK_X(dpll_hw_state.ctrl1);
        PIPE_CONF_CHECK_X(dpll_hw_state.cfgcr1);
        PIPE_CONF_CHECK_X(dpll_hw_state.cfgcr2);
        PIPE_CONF_CHECK_X(dpll_hw_state.cfgcr0);
        PIPE_CONF_CHECK_X(dpll_hw_state.ebb0);
        PIPE_CONF_CHECK_X(dpll_hw_state.ebb4);
        PIPE_CONF_CHECK_X(dpll_hw_state.pll0);
        PIPE_CONF_CHECK_X(dpll_hw_state.pll1);
        PIPE_CONF_CHECK_X(dpll_hw_state.pll2);
        PIPE_CONF_CHECK_X(dpll_hw_state.pll3);
        PIPE_CONF_CHECK_X(dpll_hw_state.pll6);
        PIPE_CONF_CHECK_X(dpll_hw_state.pll8);
        PIPE_CONF_CHECK_X(dpll_hw_state.pll9);
        PIPE_CONF_CHECK_X(dpll_hw_state.pll10);
        PIPE_CONF_CHECK_X(dpll_hw_state.pcsdw12);
        PIPE_CONF_CHECK_X(dpll_hw_state.mg_refclkin_ctl);
        PIPE_CONF_CHECK_X(dpll_hw_state.mg_clktop2_coreclkctl1);
        PIPE_CONF_CHECK_X(dpll_hw_state.mg_clktop2_hsclkctl);
        PIPE_CONF_CHECK_X(dpll_hw_state.mg_pll_div0);
        PIPE_CONF_CHECK_X(dpll_hw_state.mg_pll_div1);
        PIPE_CONF_CHECK_X(dpll_hw_state.mg_pll_lf);
        PIPE_CONF_CHECK_X(dpll_hw_state.mg_pll_frac_lock);
        PIPE_CONF_CHECK_X(dpll_hw_state.mg_pll_ssc);
        PIPE_CONF_CHECK_X(dpll_hw_state.mg_pll_bias);
        PIPE_CONF_CHECK_X(dpll_hw_state.mg_pll_tdc_coldst_bias);

        PIPE_CONF_CHECK_X(dsi_pll.ctrl);
        PIPE_CONF_CHECK_X(dsi_pll.div);

        if (IS_G4X(dev_priv) || INTEL_GEN(dev_priv) >= 5)
                PIPE_CONF_CHECK_I(pipe_bpp);

        PIPE_CONF_CHECK_CLOCK_FUZZY(base.adjusted_mode.crtc_clock);
        PIPE_CONF_CHECK_CLOCK_FUZZY(port_clock);

        PIPE_CONF_CHECK_I(min_voltage_level);

#undef PIPE_CONF_CHECK_X
#undef PIPE_CONF_CHECK_I
#undef PIPE_CONF_CHECK_BOOL
#undef PIPE_CONF_CHECK_BOOL_INCOMPLETE
#undef PIPE_CONF_CHECK_P
#undef PIPE_CONF_CHECK_FLAGS
#undef PIPE_CONF_CHECK_CLOCK_FUZZY
#undef PIPE_CONF_QUIRK

        return ret;
}

static void intel_pipe_config_sanity_check(struct drm_i915_private *dev_priv,
                                           const struct intel_crtc_state *pipe_config)
{
        if (pipe_config->has_pch_encoder) {
                int fdi_dotclock = intel_dotclock_calculate(intel_fdi_link_freq(dev_priv, pipe_config),
                                                            &pipe_config->fdi_m_n);
                int dotclock = pipe_config->base.adjusted_mode.crtc_clock;

                /*
                 * FDI already provided one idea for the dotclock.
                 * Yell if the encoder disagrees.
                 */
                WARN(!intel_fuzzy_clock_check(fdi_dotclock, dotclock),
                     "FDI dotclock and encoder dotclock mismatch, fdi: %i, encoder: %i\n",
                     fdi_dotclock, dotclock);
        }
}

static void verify_wm_state(struct drm_crtc *crtc,
                            struct drm_crtc_state *new_state)
{
        struct drm_i915_private *dev_priv = to_i915(crtc->dev);
        struct skl_ddb_allocation hw_ddb, *sw_ddb;
        struct skl_pipe_wm hw_wm, *sw_wm;
        struct skl_plane_wm *hw_plane_wm, *sw_plane_wm;
        struct skl_ddb_entry *hw_ddb_entry, *sw_ddb_entry;
        struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
        const enum i915_pipe pipe = intel_crtc->pipe;
        int plane, level, max_level = ilk_wm_max_level(dev_priv);

        if (INTEL_GEN(dev_priv) < 9 || !new_state->active)
                return;

        skl_pipe_wm_get_hw_state(crtc, &hw_wm);
        sw_wm = &to_intel_crtc_state(new_state)->wm.skl.optimal;

        skl_ddb_get_hw_state(dev_priv, &hw_ddb);
        sw_ddb = &dev_priv->wm.skl_hw.ddb;

        if (INTEL_GEN(dev_priv) >= 11)
                if (hw_ddb.enabled_slices != sw_ddb->enabled_slices)
                        DRM_ERROR("mismatch in DBUF Slices (expected %u, got %u)\n",
                                  sw_ddb->enabled_slices,
                                  hw_ddb.enabled_slices);
        /* planes */
        for_each_universal_plane(dev_priv, pipe, plane) {
                hw_plane_wm = &hw_wm.planes[plane];
                sw_plane_wm = &sw_wm->planes[plane];

                /* Watermarks */
                for (level = 0; level <= max_level; level++) {
                        if (skl_wm_level_equals(&hw_plane_wm->wm[level],
                                                &sw_plane_wm->wm[level]))
                                continue;

                        DRM_ERROR("mismatch in WM pipe %c plane %d level %d (expected e=%d b=%u l=%u, got e=%d b=%u l=%u)\n",
                                  pipe_name(pipe), plane + 1, level,
                                  sw_plane_wm->wm[level].plane_en,
                                  sw_plane_wm->wm[level].plane_res_b,
                                  sw_plane_wm->wm[level].plane_res_l,
                                  hw_plane_wm->wm[level].plane_en,
                                  hw_plane_wm->wm[level].plane_res_b,
                                  hw_plane_wm->wm[level].plane_res_l);
                }

                if (!skl_wm_level_equals(&hw_plane_wm->trans_wm,
                                         &sw_plane_wm->trans_wm)) {
                        DRM_ERROR("mismatch in trans WM pipe %c plane %d (expected e=%d b=%u l=%u, got e=%d b=%u l=%u)\n",
                                  pipe_name(pipe), plane + 1,
                                  sw_plane_wm->trans_wm.plane_en,
                                  sw_plane_wm->trans_wm.plane_res_b,
                                  sw_plane_wm->trans_wm.plane_res_l,
                                  hw_plane_wm->trans_wm.plane_en,
                                  hw_plane_wm->trans_wm.plane_res_b,
                                  hw_plane_wm->trans_wm.plane_res_l);
                }

                /* DDB */
                hw_ddb_entry = &hw_ddb.plane[pipe][plane];
                sw_ddb_entry = &sw_ddb->plane[pipe][plane];

                if (!skl_ddb_entry_equal(hw_ddb_entry, sw_ddb_entry)) {
                        DRM_ERROR("mismatch in DDB state pipe %c plane %d (expected (%u,%u), found (%u,%u))\n",
                                  pipe_name(pipe), plane + 1,
                                  sw_ddb_entry->start, sw_ddb_entry->end,
                                  hw_ddb_entry->start, hw_ddb_entry->end);
                }
        }

        /*
         * cursor
         * If the cursor plane isn't active, we may not have updated it's ddb
         * allocation. In that case since the ddb allocation will be updated
         * once the plane becomes visible, we can skip this check
         */
        if (1) {
                hw_plane_wm = &hw_wm.planes[PLANE_CURSOR];
                sw_plane_wm = &sw_wm->planes[PLANE_CURSOR];

                /* Watermarks */
                for (level = 0; level <= max_level; level++) {
                        if (skl_wm_level_equals(&hw_plane_wm->wm[level],
                                                &sw_plane_wm->wm[level]))
                                continue;

                        DRM_ERROR("mismatch in WM pipe %c cursor level %d (expected e=%d b=%u l=%u, got e=%d b=%u l=%u)\n",
                                  pipe_name(pipe), level,
                                  sw_plane_wm->wm[level].plane_en,
                                  sw_plane_wm->wm[level].plane_res_b,
                                  sw_plane_wm->wm[level].plane_res_l,
                                  hw_plane_wm->wm[level].plane_en,
                                  hw_plane_wm->wm[level].plane_res_b,
                                  hw_plane_wm->wm[level].plane_res_l);
                }

                if (!skl_wm_level_equals(&hw_plane_wm->trans_wm,
                                         &sw_plane_wm->trans_wm)) {
                        DRM_ERROR("mismatch in trans WM pipe %c cursor (expected e=%d b=%u l=%u, got e=%d b=%u l=%u)\n",
                                  pipe_name(pipe),
                                  sw_plane_wm->trans_wm.plane_en,
                                  sw_plane_wm->trans_wm.plane_res_b,
                                  sw_plane_wm->trans_wm.plane_res_l,
                                  hw_plane_wm->trans_wm.plane_en,
                                  hw_plane_wm->trans_wm.plane_res_b,
                                  hw_plane_wm->trans_wm.plane_res_l);
                }

                /* DDB */
                hw_ddb_entry = &hw_ddb.plane[pipe][PLANE_CURSOR];
                sw_ddb_entry = &sw_ddb->plane[pipe][PLANE_CURSOR];

                if (!skl_ddb_entry_equal(hw_ddb_entry, sw_ddb_entry)) {
                        DRM_ERROR("mismatch in DDB state pipe %c cursor (expected (%u,%u), found (%u,%u))\n",
                                  pipe_name(pipe),
                                  sw_ddb_entry->start, sw_ddb_entry->end,
                                  hw_ddb_entry->start, hw_ddb_entry->end);
                }
        }
}

static void
verify_connector_state(struct drm_device *dev,
                       struct drm_atomic_state *state,
                       struct drm_crtc *crtc)
{
        struct drm_connector *connector;
        struct drm_connector_state *new_conn_state;
        int i;

        for_each_new_connector_in_state(state, connector, new_conn_state, i) {
                struct drm_encoder *encoder = connector->encoder;
                struct drm_crtc_state *crtc_state = NULL;

                if (new_conn_state->crtc != crtc)
                        continue;

                if (crtc)
                        crtc_state = drm_atomic_get_new_crtc_state(state, new_conn_state->crtc);

                intel_connector_verify_state(crtc_state, new_conn_state);

                I915_STATE_WARN(new_conn_state->best_encoder != encoder,
                     "connector's atomic encoder doesn't match legacy encoder\n");
        }
}

static void
verify_encoder_state(struct drm_device *dev, struct drm_atomic_state *state)
{
        struct intel_encoder *encoder;
        struct drm_connector *connector;
        struct drm_connector_state *old_conn_state, *new_conn_state;
        int i;

        for_each_intel_encoder(dev, encoder) {
                bool enabled = false, found = false;
                enum i915_pipe pipe;

                DRM_DEBUG_KMS("[ENCODER:%d:%s]\n",
                              encoder->base.base.id,
                              encoder->base.name);

                for_each_oldnew_connector_in_state(state, connector, old_conn_state,
                                                   new_conn_state, i) {
                        if (old_conn_state->best_encoder == &encoder->base)
                                found = true;

                        if (new_conn_state->best_encoder != &encoder->base)
                                continue;
                        found = enabled = true;

                        I915_STATE_WARN(new_conn_state->crtc !=
                                        encoder->base.crtc,
                             "connector's crtc doesn't match encoder crtc\n");
                }

                if (!found)
                        continue;

                I915_STATE_WARN(!!encoder->base.crtc != enabled,
                     "encoder's enabled state mismatch "
                     "(expected %i, found %i)\n",
                     !!encoder->base.crtc, enabled);

                if (!encoder->base.crtc) {
                        bool active;

                        active = encoder->get_hw_state(encoder, &pipe);
                        I915_STATE_WARN(active,
                             "encoder detached but still enabled on pipe %c.\n",
                             pipe_name(pipe));
                }
        }
}

static void
verify_crtc_state(struct drm_crtc *crtc,
                  struct drm_crtc_state *old_crtc_state,
                  struct drm_crtc_state *new_crtc_state)
{
        struct drm_device *dev = crtc->dev;
        struct drm_i915_private *dev_priv = to_i915(dev);
        struct intel_encoder *encoder;
        struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
        struct intel_crtc_state *pipe_config, *sw_config;
        struct drm_atomic_state *old_state;
        bool active;

        old_state = old_crtc_state->state;
        __drm_atomic_helper_crtc_destroy_state(old_crtc_state);
        pipe_config = to_intel_crtc_state(old_crtc_state);
        memset(pipe_config, 0, sizeof(*pipe_config));
        pipe_config->base.crtc = crtc;
        pipe_config->base.state = old_state;

        DRM_DEBUG_KMS("[CRTC:%d:%s]\n", crtc->base.id, crtc->name);

        active = dev_priv->display.get_pipe_config(intel_crtc, pipe_config);

        /* we keep both pipes enabled on 830 */
        if (IS_I830(dev_priv))
                active = new_crtc_state->active;

        I915_STATE_WARN(new_crtc_state->active != active,
             "crtc active state doesn't match with hw state "
             "(expected %i, found %i)\n", new_crtc_state->active, active);

        I915_STATE_WARN(intel_crtc->active != new_crtc_state->active,
             "transitional active state does not match atomic hw state "
             "(expected %i, found %i)\n", new_crtc_state->active, intel_crtc->active);

        for_each_encoder_on_crtc(dev, crtc, encoder) {
                enum i915_pipe pipe;

                active = encoder->get_hw_state(encoder, &pipe);
                I915_STATE_WARN(active != new_crtc_state->active,
                        "[ENCODER:%i] active %i with crtc active %i\n",
                        encoder->base.base.id, active, new_crtc_state->active);

                I915_STATE_WARN(active && intel_crtc->pipe != pipe,
                                "Encoder connected to wrong pipe %c\n",
                                pipe_name(pipe));

                if (active)
                        encoder->get_config(encoder, pipe_config);
        }

        intel_crtc_compute_pixel_rate(pipe_config);

        if (!new_crtc_state->active)
                return;

        intel_pipe_config_sanity_check(dev_priv, pipe_config);

        sw_config = to_intel_crtc_state(new_crtc_state);
        if (!intel_pipe_config_compare(dev_priv, sw_config,
                                       pipe_config, false)) {
                I915_STATE_WARN(1, "pipe state doesn't match!\n");
                intel_dump_pipe_config(intel_crtc, pipe_config,
                                       "[hw state]");
                intel_dump_pipe_config(intel_crtc, sw_config,
                                       "[sw state]");
        }
}

static void
intel_verify_planes(struct intel_atomic_state *state)
{
        struct intel_plane *plane;
        const struct intel_plane_state *plane_state;
        int i;

        for_each_new_intel_plane_in_state(state, plane,
                                          plane_state, i)
                assert_plane(plane, plane_state->base.visible);
}

static void
verify_single_dpll_state(struct drm_i915_private *dev_priv,
                         struct intel_shared_dpll *pll,
                         struct drm_crtc *crtc,
                         struct drm_crtc_state *new_state)
{
        struct intel_dpll_hw_state dpll_hw_state;
        unsigned int crtc_mask;
        bool active;

        memset(&dpll_hw_state, 0, sizeof(dpll_hw_state));

        DRM_DEBUG_KMS("%s\n", pll->info->name);

        active = pll->info->funcs->get_hw_state(dev_priv, pll, &dpll_hw_state);

        if (!(pll->info->flags & INTEL_DPLL_ALWAYS_ON)) {
                I915_STATE_WARN(!pll->on && pll->active_mask,
                     "pll in active use but not on in sw tracking\n");
                I915_STATE_WARN(pll->on && !pll->active_mask,
                     "pll is on but not used by any active crtc\n");
                I915_STATE_WARN(pll->on != active,
                     "pll on state mismatch (expected %i, found %i)\n",
                     pll->on, active);
        }

        if (!crtc) {
                I915_STATE_WARN(pll->active_mask & ~pll->state.crtc_mask,
                                "more active pll users than references: %x vs %x\n",
                                pll->active_mask, pll->state.crtc_mask);

                return;
        }

        crtc_mask = drm_crtc_mask(crtc);

        if (new_state->active)
                I915_STATE_WARN(!(pll->active_mask & crtc_mask),
                                "pll active mismatch (expected pipe %c in active mask 0x%02x)\n",
                                pipe_name(drm_crtc_index(crtc)), pll->active_mask);
        else
                I915_STATE_WARN(pll->active_mask & crtc_mask,
                                "pll active mismatch (didn't expect pipe %c in active mask 0x%02x)\n",
                                pipe_name(drm_crtc_index(crtc)), pll->active_mask);

        I915_STATE_WARN(!(pll->state.crtc_mask & crtc_mask),
                        "pll enabled crtcs mismatch (expected 0x%x in 0x%02x)\n",
                        crtc_mask, pll->state.crtc_mask);

        I915_STATE_WARN(pll->on && memcmp(&pll->state.hw_state,
                                          &dpll_hw_state,
                                          sizeof(dpll_hw_state)),
                        "pll hw state mismatch\n");
}

static void
verify_shared_dpll_state(struct drm_device *dev, struct drm_crtc *crtc,
                         struct drm_crtc_state *old_crtc_state,
                         struct drm_crtc_state *new_crtc_state)
{
        struct drm_i915_private *dev_priv = to_i915(dev);
        struct intel_crtc_state *old_state = to_intel_crtc_state(old_crtc_state);
        struct intel_crtc_state *new_state = to_intel_crtc_state(new_crtc_state);

        if (new_state->shared_dpll)
                verify_single_dpll_state(dev_priv, new_state->shared_dpll, crtc, new_crtc_state);

        if (old_state->shared_dpll &&
            old_state->shared_dpll != new_state->shared_dpll) {
                unsigned int crtc_mask = drm_crtc_mask(crtc);
                struct intel_shared_dpll *pll = old_state->shared_dpll;

                I915_STATE_WARN(pll->active_mask & crtc_mask,
                                "pll active mismatch (didn't expect pipe %c in active mask)\n",
                                pipe_name(drm_crtc_index(crtc)));
                I915_STATE_WARN(pll->state.crtc_mask & crtc_mask,
                                "pll enabled crtcs mismatch (found %x in enabled mask)\n",
                                pipe_name(drm_crtc_index(crtc)));
        }
}

static void
intel_modeset_verify_crtc(struct drm_crtc *crtc,
                          struct drm_atomic_state *state,
                          struct drm_crtc_state *old_state,
                          struct drm_crtc_state *new_state)
{
        if (!needs_modeset(new_state) &&
            !to_intel_crtc_state(new_state)->update_pipe)
                return;

        verify_wm_state(crtc, new_state);
        verify_connector_state(crtc->dev, state, crtc);
        verify_crtc_state(crtc, old_state, new_state);
        verify_shared_dpll_state(crtc->dev, crtc, old_state, new_state);
}

static void
verify_disabled_dpll_state(struct drm_device *dev)
{
        struct drm_i915_private *dev_priv = to_i915(dev);
        int i;

        for (i = 0; i < dev_priv->num_shared_dpll; i++)
                verify_single_dpll_state(dev_priv, &dev_priv->shared_dplls[i], NULL, NULL);
}

static void
intel_modeset_verify_disabled(struct drm_device *dev,
                              struct drm_atomic_state *state)
{
        verify_encoder_state(dev, state);
        verify_connector_state(dev, state, NULL);
        verify_disabled_dpll_state(dev);
}

static void update_scanline_offset(struct intel_crtc *crtc)
{
        struct drm_i915_private *dev_priv = to_i915(crtc->base.dev);

        /*
         * The scanline counter increments at the leading edge of hsync.
         *
         * On most platforms it starts counting from vtotal-1 on the
         * first active line. That means the scanline counter value is
         * always one less than what we would expect. Ie. just after
         * start of vblank, which also occurs at start of hsync (on the
         * last active line), the scanline counter will read vblank_start-1.
         *
         * On gen2 the scanline counter starts counting from 1 instead
         * of vtotal-1, so we have to subtract one (or rather add vtotal-1
         * to keep the value positive), instead of adding one.
         *
         * On HSW+ the behaviour of the scanline counter depends on the output
         * type. For DP ports it behaves like most other platforms, but on HDMI
         * there's an extra 1 line difference. So we need to add two instead of
         * one to the value.
         *
         * On VLV/CHV DSI the scanline counter would appear to increment
         * approx. 1/3 of a scanline before start of vblank. Unfortunately
         * that means we can't tell whether we're in vblank or not while
         * we're on that particular line. We must still set scanline_offset
         * to 1 so that the vblank timestamps come out correct when we query
         * the scanline counter from within the vblank interrupt handler.
         * However if queried just before the start of vblank we'll get an
         * answer that's slightly in the future.
         */
        if (IS_GEN2(dev_priv)) {
                const struct drm_display_mode *adjusted_mode = &crtc->config->base.adjusted_mode;
                int vtotal;

                vtotal = adjusted_mode->crtc_vtotal;
                if (adjusted_mode->flags & DRM_MODE_FLAG_INTERLACE)
                        vtotal /= 2;

                crtc->scanline_offset = vtotal - 1;
        } else if (HAS_DDI(dev_priv) &&
                   intel_crtc_has_type(crtc->config, INTEL_OUTPUT_HDMI)) {
                crtc->scanline_offset = 2;
        } else
                crtc->scanline_offset = 1;
}

static void intel_modeset_clear_plls(struct drm_atomic_state *state)
{
        struct drm_device *dev = state->dev;
        struct drm_i915_private *dev_priv = to_i915(dev);
        struct drm_crtc *crtc;
        struct drm_crtc_state *old_crtc_state, *new_crtc_state;
        int i;

        if (!dev_priv->display.crtc_compute_clock)
                return;

        for_each_oldnew_crtc_in_state(state, crtc, old_crtc_state, new_crtc_state, i) {
                struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
                struct intel_shared_dpll *old_dpll =
                        to_intel_crtc_state(old_crtc_state)->shared_dpll;

                if (!needs_modeset(new_crtc_state))
                        continue;

                to_intel_crtc_state(new_crtc_state)->shared_dpll = NULL;

                if (!old_dpll)
                        continue;

                intel_release_shared_dpll(old_dpll, intel_crtc, state);
        }
}

/*
 * This implements the workaround described in the "notes" section of the mode
 * set sequence documentation. When going from no pipes or single pipe to
 * multiple pipes, and planes are enabled after the pipe, we need to wait at
 * least 2 vblanks on the first pipe before enabling planes on the second pipe.
 */
static int haswell_mode_set_planes_workaround(struct drm_atomic_state *state)
{
        struct drm_crtc_state *crtc_state;
        struct intel_crtc *intel_crtc;
        struct drm_crtc *crtc;
        struct intel_crtc_state *first_crtc_state = NULL;
        struct intel_crtc_state *other_crtc_state = NULL;
        enum i915_pipe first_pipe = INVALID_PIPE, enabled_pipe = INVALID_PIPE;
        int i;

        /* look at all crtc's that are going to be enabled in during modeset */
        for_each_new_crtc_in_state(state, crtc, crtc_state, i) {
                intel_crtc = to_intel_crtc(crtc);

                if (!crtc_state->active || !needs_modeset(crtc_state))
                        continue;

                if (first_crtc_state) {
                        other_crtc_state = to_intel_crtc_state(crtc_state);
                        break;
                } else {
                        first_crtc_state = to_intel_crtc_state(crtc_state);
                        first_pipe = intel_crtc->pipe;
                }
        }

        /* No workaround needed? */
        if (!first_crtc_state)
                return 0;

        /* w/a possibly needed, check how many crtc's are already enabled. */
        for_each_intel_crtc(state->dev, intel_crtc) {
                struct intel_crtc_state *pipe_config;

                pipe_config = intel_atomic_get_crtc_state(state, intel_crtc);
                if (IS_ERR(pipe_config))
                        return PTR_ERR(pipe_config);

                pipe_config->hsw_workaround_pipe = INVALID_PIPE;

                if (!pipe_config->base.active ||
                    needs_modeset(&pipe_config->base))
                        continue;

                /* 2 or more enabled crtcs means no need for w/a */
                if (enabled_pipe != INVALID_PIPE)
                        return 0;

                enabled_pipe = intel_crtc->pipe;
        }

        if (enabled_pipe != INVALID_PIPE)
                first_crtc_state->hsw_workaround_pipe = enabled_pipe;
        else if (other_crtc_state)
                other_crtc_state->hsw_workaround_pipe = first_pipe;

        return 0;
}

static int intel_lock_all_pipes(struct drm_atomic_state *state)
{
        struct drm_crtc *crtc;

        /* Add all pipes to the state */
        for_each_crtc(state->dev, crtc) {
                struct drm_crtc_state *crtc_state;

                crtc_state = drm_atomic_get_crtc_state(state, crtc);
                if (IS_ERR(crtc_state))
                        return PTR_ERR(crtc_state);
        }

        return 0;
}

static int intel_modeset_all_pipes(struct drm_atomic_state *state)
{
        struct drm_crtc *crtc;

        /*
         * Add all pipes to the state, and force
         * a modeset on all the active ones.
         */
        for_each_crtc(state->dev, crtc) {
                struct drm_crtc_state *crtc_state;
                int ret;

                crtc_state = drm_atomic_get_crtc_state(state, crtc);
                if (IS_ERR(crtc_state))
                        return PTR_ERR(crtc_state);

                if (!crtc_state->active || needs_modeset(crtc_state))
                        continue;

                crtc_state->mode_changed = true;

                ret = drm_atomic_add_affected_connectors(state, crtc);
                if (ret)
                        return ret;

                ret = drm_atomic_add_affected_planes(state, crtc);
                if (ret)
                        return ret;
        }

        return 0;
}

static int intel_modeset_checks(struct drm_atomic_state *state)
{
        struct intel_atomic_state *intel_state = to_intel_atomic_state(state);
        struct drm_i915_private *dev_priv = to_i915(state->dev);
        struct drm_crtc *crtc;
        struct drm_crtc_state *old_crtc_state, *new_crtc_state;
        int ret = 0, i;

        if (!check_digital_port_conflicts(state)) {
                DRM_DEBUG_KMS("rejecting conflicting digital port configuration\n");
                return -EINVAL;
        }

        intel_state->modeset = true;
        intel_state->active_crtcs = dev_priv->active_crtcs;
        intel_state->cdclk.logical = dev_priv->cdclk.logical;
        intel_state->cdclk.actual = dev_priv->cdclk.actual;

        for_each_oldnew_crtc_in_state(state, crtc, old_crtc_state, new_crtc_state, i) {
                if (new_crtc_state->active)
                        intel_state->active_crtcs |= 1 << i;
                else
                        intel_state->active_crtcs &= ~(1 << i);

                if (old_crtc_state->active != new_crtc_state->active)
                        intel_state->active_pipe_changes |= drm_crtc_mask(crtc);
        }

        /*
         * See if the config requires any additional preparation, e.g.
         * to adjust global state with pipes off.  We need to do this
         * here so we can get the modeset_pipe updated config for the new
         * mode set on this crtc.  For other crtcs we need to use the
         * adjusted_mode bits in the crtc directly.
         */
        if (dev_priv->display.modeset_calc_cdclk) {
                ret = dev_priv->display.modeset_calc_cdclk(state);
                if (ret < 0)
                        return ret;

                /*
                 * Writes to dev_priv->cdclk.logical must protected by
                 * holding all the crtc locks, even if we don't end up
                 * touching the hardware
                 */
                if (intel_cdclk_changed(&dev_priv->cdclk.logical,
                                        &intel_state->cdclk.logical)) {
                        ret = intel_lock_all_pipes(state);
                        if (ret < 0)
                                return ret;
                }

                /* All pipes must be switched off while we change the cdclk. */
                if (intel_cdclk_needs_modeset(&dev_priv->cdclk.actual,
                                              &intel_state->cdclk.actual)) {
                        ret = intel_modeset_all_pipes(state);
                        if (ret < 0)
                                return ret;
                }

                DRM_DEBUG_KMS("New cdclk calculated to be logical %u kHz, actual %u kHz\n",
                              intel_state->cdclk.logical.cdclk,
                              intel_state->cdclk.actual.cdclk);
                DRM_DEBUG_KMS("New voltage level calculated to be logical %u, actual %u\n",
                              intel_state->cdclk.logical.voltage_level,
                              intel_state->cdclk.actual.voltage_level);
        } else {
                to_intel_atomic_state(state)->cdclk.logical = dev_priv->cdclk.logical;
        }

        intel_modeset_clear_plls(state);

        if (IS_HASWELL(dev_priv))
                return haswell_mode_set_planes_workaround(state);

        return 0;
}

/*
 * Handle calculation of various watermark data at the end of the atomic check
 * phase.  The code here should be run after the per-crtc and per-plane 'check'
 * handlers to ensure that all derived state has been updated.
 */
static int calc_watermark_data(struct drm_atomic_state *state)
{
        struct drm_device *dev = state->dev;
        struct drm_i915_private *dev_priv = to_i915(dev);

        /* Is there platform-specific watermark information to calculate? */
        if (dev_priv->display.compute_global_watermarks)
                return dev_priv->display.compute_global_watermarks(state);

        return 0;
}

/**
 * intel_atomic_check - validate state object
 * @dev: drm device
 * @state: state to validate
 */
static int intel_atomic_check(struct drm_device *dev,
                              struct drm_atomic_state *state)
{
        struct drm_i915_private *dev_priv = to_i915(dev);
        struct intel_atomic_state *intel_state = to_intel_atomic_state(state);
        struct drm_crtc *crtc;
        struct drm_crtc_state *old_crtc_state, *crtc_state;
        int ret, i;
        bool any_ms = false;

        /* Catch I915_MODE_FLAG_INHERITED */
        for_each_oldnew_crtc_in_state(state, crtc, old_crtc_state,
                                      crtc_state, i) {
                if (crtc_state->mode.private_flags !=
                    old_crtc_state->mode.private_flags)
                        crtc_state->mode_changed = true;
        }

        ret = drm_atomic_helper_check_modeset(dev, state);
        if (ret)
                return ret;

        for_each_oldnew_crtc_in_state(state, crtc, old_crtc_state, crtc_state, i) {
                struct intel_crtc_state *pipe_config =
                        to_intel_crtc_state(crtc_state);

                if (!needs_modeset(crtc_state))
                        continue;

                if (!crtc_state->enable) {
                        any_ms = true;
                        continue;
                }

                ret = intel_modeset_pipe_config(crtc, pipe_config);
                if (ret) {
                        intel_dump_pipe_config(to_intel_crtc(crtc),
                                               pipe_config, "[failed]");
                        return ret;
                }

                if (i915_modparams.fastboot &&
                    intel_pipe_config_compare(dev_priv,
                                        to_intel_crtc_state(old_crtc_state),
                                        pipe_config, true)) {
                        crtc_state->mode_changed = false;
                        pipe_config->update_pipe = true;
                }

                if (needs_modeset(crtc_state))
                        any_ms = true;

                intel_dump_pipe_config(to_intel_crtc(crtc), pipe_config,
                                       needs_modeset(crtc_state) ?
                                       "[modeset]" : "[fastset]");
        }

        if (any_ms) {
                ret = intel_modeset_checks(state);

                if (ret)
                        return ret;
        } else {
                intel_state->cdclk.logical = dev_priv->cdclk.logical;
        }

        ret = drm_atomic_helper_check_planes(dev, state);
        if (ret)
                return ret;

        intel_fbc_choose_crtc(dev_priv, intel_state);
        return calc_watermark_data(state);
}

static int intel_atomic_prepare_commit(struct drm_device *dev,
                                       struct drm_atomic_state *state)
{
        return drm_atomic_helper_prepare_planes(dev, state);
}

u32 intel_crtc_get_vblank_counter(struct intel_crtc *crtc)
{
        struct drm_device *dev = crtc->base.dev;

        if (!dev->max_vblank_count)
                return (u32)drm_crtc_accurate_vblank_count(&crtc->base);

        return dev->driver->get_vblank_counter(dev, crtc->pipe);
}

static void intel_update_crtc(struct drm_crtc *crtc,
                              struct drm_atomic_state *state,
                              struct drm_crtc_state *old_crtc_state,
                              struct drm_crtc_state *new_crtc_state)
{
        struct drm_device *dev = crtc->dev;
        struct drm_i915_private *dev_priv = to_i915(dev);
        struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
        struct intel_crtc_state *pipe_config = to_intel_crtc_state(new_crtc_state);
        bool modeset = needs_modeset(new_crtc_state);
        struct intel_plane_state *new_plane_state =
                intel_atomic_get_new_plane_state(to_intel_atomic_state(state),
                                                 to_intel_plane(crtc->primary));

        if (modeset) {
                update_scanline_offset(intel_crtc);
                dev_priv->display.crtc_enable(pipe_config, state);

                /* vblanks work again, re-enable pipe CRC. */
                intel_crtc_enable_pipe_crc(intel_crtc);
        } else {
                intel_pre_plane_update(to_intel_crtc_state(old_crtc_state),
                                       pipe_config);
        }

        if (new_plane_state)
                intel_fbc_enable(intel_crtc, pipe_config, new_plane_state);

        drm_atomic_helper_commit_planes_on_crtc(old_crtc_state);
}

static void intel_update_crtcs(struct drm_atomic_state *state)
{
        struct drm_crtc *crtc;
        struct drm_crtc_state *old_crtc_state, *new_crtc_state;
        int i;

        for_each_oldnew_crtc_in_state(state, crtc, old_crtc_state, new_crtc_state, i) {
                if (!new_crtc_state->active)
                        continue;

                intel_update_crtc(crtc, state, old_crtc_state,
                                  new_crtc_state);
        }
}

static void skl_update_crtcs(struct drm_atomic_state *state)
{
        struct drm_i915_private *dev_priv = to_i915(state->dev);
        struct intel_atomic_state *intel_state = to_intel_atomic_state(state);
        struct drm_crtc *crtc;
        struct intel_crtc *intel_crtc;
        struct drm_crtc_state *old_crtc_state, *new_crtc_state;
        struct intel_crtc_state *cstate;
        unsigned int updated = 0;
        bool progress;
        enum i915_pipe pipe;
        int i;
        u8 hw_enabled_slices = dev_priv->wm.skl_hw.ddb.enabled_slices;
        u8 required_slices = intel_state->wm_results.ddb.enabled_slices;

        const struct skl_ddb_entry *entries[I915_MAX_PIPES] = {};

        for_each_oldnew_crtc_in_state(state, crtc, old_crtc_state, new_crtc_state, i)
                /* ignore allocations for crtc's that have been turned off. */
                if (new_crtc_state->active)
                        entries[i] = &to_intel_crtc_state(old_crtc_state)->wm.skl.ddb;

        /* If 2nd DBuf slice required, enable it here */
        if (INTEL_GEN(dev_priv) >= 11 && required_slices > hw_enabled_slices)
                icl_dbuf_slices_update(dev_priv, required_slices);

        /*
         * Whenever the number of active pipes changes, we need to make sure we
         * update the pipes in the right order so that their ddb allocations
         * never overlap with eachother inbetween CRTC updates. Otherwise we'll
         * cause pipe underruns and other bad stuff.
         */
        do {
                progress = false;

                for_each_oldnew_crtc_in_state(state, crtc, old_crtc_state, new_crtc_state, i) {
                        bool vbl_wait = false;
                        unsigned int cmask = drm_crtc_mask(crtc);

                        intel_crtc = to_intel_crtc(crtc);
                        cstate = to_intel_crtc_state(new_crtc_state);
                        pipe = intel_crtc->pipe;

                        if (updated & cmask || !cstate->base.active)
                                continue;

                        if (skl_ddb_allocation_overlaps(dev_priv,
                                                        entries,
                                                        &cstate->wm.skl.ddb,
                                                        i))
                                continue;

                        updated |= cmask;
                        entries[i] = &cstate->wm.skl.ddb;

                        /*
                         * If this is an already active pipe, it's DDB changed,
                         * and this isn't the last pipe that needs updating
                         * then we need to wait for a vblank to pass for the
                         * new ddb allocation to take effect.
                         */
                        if (!skl_ddb_entry_equal(&cstate->wm.skl.ddb,
                                                 &to_intel_crtc_state(old_crtc_state)->wm.skl.ddb) &&
                            !new_crtc_state->active_changed &&
                            intel_state->wm_results.dirty_pipes != updated)
                                vbl_wait = true;

                        intel_update_crtc(crtc, state, old_crtc_state,
                                          new_crtc_state);

                        if (vbl_wait)
                                intel_wait_for_vblank(dev_priv, pipe);

                        progress = true;
                }
        } while (progress);

        /* If 2nd DBuf slice is no more required disable it */
        if (INTEL_GEN(dev_priv) >= 11 && required_slices < hw_enabled_slices)
                icl_dbuf_slices_update(dev_priv, required_slices);
}

static void intel_atomic_helper_free_state(struct drm_i915_private *dev_priv)
{
        struct intel_atomic_state *state, *next;
        struct llist_node *freed;

        freed = llist_del_all(&dev_priv->atomic_helper.free_list);
        llist_for_each_entry_safe(state, next, freed, freed)
                drm_atomic_state_put(&state->base);
}

static void intel_atomic_helper_free_state_worker(struct work_struct *work)
{
        struct drm_i915_private *dev_priv =
                container_of(work, typeof(*dev_priv), atomic_helper.free_work);

        intel_atomic_helper_free_state(dev_priv);
}

static void intel_atomic_commit_fence_wait(struct intel_atomic_state *intel_state)
{
        struct wait_queue_entry wait_fence, wait_reset;
        struct drm_i915_private *dev_priv = to_i915(intel_state->base.dev);

        init_wait_entry(&wait_fence, 0);
        init_wait_entry(&wait_reset, 0);
        for (;;) {
                prepare_to_wait(&intel_state->commit_ready.wait,
                                &wait_fence, TASK_UNINTERRUPTIBLE);
                prepare_to_wait(&dev_priv->gpu_error.wait_queue,
                                &wait_reset, TASK_UNINTERRUPTIBLE);


                if (i915_sw_fence_done(&intel_state->commit_ready)
                    || test_bit(I915_RESET_MODESET, &dev_priv->gpu_error.flags))
                        break;

                schedule();
        }
        finish_wait(&intel_state->commit_ready.wait, &wait_fence);
        finish_wait(&dev_priv->gpu_error.wait_queue, &wait_reset);
}

static void intel_atomic_cleanup_work(struct work_struct *work)
{
        struct drm_atomic_state *state =
                container_of(work, struct drm_atomic_state, commit_work);
        struct drm_i915_private *i915 = to_i915(state->dev);

        drm_atomic_helper_cleanup_planes(&i915->drm, state);
        drm_atomic_helper_commit_cleanup_done(state);
        drm_atomic_state_put(state);

        intel_atomic_helper_free_state(i915);
}

static void intel_atomic_commit_tail(struct drm_atomic_state *state)
{
        struct drm_device *dev = state->dev;
        struct intel_atomic_state *intel_state = to_intel_atomic_state(state);
        struct drm_i915_private *dev_priv = to_i915(dev);
        struct drm_crtc_state *old_crtc_state, *new_crtc_state;
        struct drm_crtc *crtc;
        struct intel_crtc_state *intel_cstate;
        u64 put_domains[I915_MAX_PIPES] = {};
        int i;

        intel_atomic_commit_fence_wait(intel_state);

        drm_atomic_helper_wait_for_dependencies(state);

        if (intel_state->modeset)
                intel_display_power_get(dev_priv, POWER_DOMAIN_MODESET);

        for_each_oldnew_crtc_in_state(state, crtc, old_crtc_state, new_crtc_state, i) {
                struct intel_crtc *intel_crtc = to_intel_crtc(crtc);

                if (needs_modeset(new_crtc_state) ||
                    to_intel_crtc_state(new_crtc_state)->update_pipe) {

                        put_domains[to_intel_crtc(crtc)->pipe] =
                                modeset_get_crtc_power_domains(crtc,
                                        to_intel_crtc_state(new_crtc_state));
                }

                if (!needs_modeset(new_crtc_state))
                        continue;

                intel_pre_plane_update(to_intel_crtc_state(old_crtc_state),
                                       to_intel_crtc_state(new_crtc_state));

                if (old_crtc_state->active) {
                        intel_crtc_disable_planes(crtc, old_crtc_state->plane_mask);

                        /*
                         * We need to disable pipe CRC before disabling the pipe,
                         * or we race against vblank off.
                         */
                        intel_crtc_disable_pipe_crc(intel_crtc);

                        dev_priv->display.crtc_disable(to_intel_crtc_state(old_crtc_state), state);
                        intel_crtc->active = false;
                        intel_fbc_disable(intel_crtc);
                        intel_disable_shared_dpll(intel_crtc);

                        /*
                         * Underruns don't always raise
                         * interrupts, so check manually.
                         */
                        intel_check_cpu_fifo_underruns(dev_priv);
                        intel_check_pch_fifo_underruns(dev_priv);

                        /* FIXME unify this for all platforms */
                        if (!new_crtc_state->active &&
                            !HAS_GMCH_DISPLAY(dev_priv) &&
                            dev_priv->display.initial_watermarks)
                                dev_priv->display.initial_watermarks(intel_state,
                                                                     to_intel_crtc_state(new_crtc_state));
                }
        }

        /* FIXME: Eventually get rid of our intel_crtc->config pointer */
        for_each_new_crtc_in_state(state, crtc, new_crtc_state, i)
                to_intel_crtc(crtc)->config = to_intel_crtc_state(new_crtc_state);

        if (intel_state->modeset) {
                drm_atomic_helper_update_legacy_modeset_state(state->dev, state);

                intel_set_cdclk(dev_priv, &dev_priv->cdclk.actual);

                /*
                 * SKL workaround: bspec recommends we disable the SAGV when we
                 * have more then one pipe enabled
                 */
                if (!intel_can_enable_sagv(state))
                        intel_disable_sagv(dev_priv);

                intel_modeset_verify_disabled(dev, state);
        }

        /* Complete the events for pipes that have now been disabled */
        for_each_new_crtc_in_state(state, crtc, new_crtc_state, i) {
                bool modeset = needs_modeset(new_crtc_state);

                /* Complete events for now disable pipes here. */
                if (modeset && !new_crtc_state->active && new_crtc_state->event) {
                        spin_lock_irq(&dev->event_lock);
                        drm_crtc_send_vblank_event(crtc, new_crtc_state->event);
                        spin_unlock_irq(&dev->event_lock);

                        new_crtc_state->event = NULL;
                }
        }

        /* Now enable the clocks, plane, pipe, and connectors that we set up. */
        dev_priv->display.update_crtcs(state);

        /* FIXME: We should call drm_atomic_helper_commit_hw_done() here
         * already, but still need the state for the delayed optimization. To
         * fix this:
         * - wrap the optimization/post_plane_update stuff into a per-crtc work.
         * - schedule that vblank worker _before_ calling hw_done
         * - at the start of commit_tail, cancel it _synchrously
         * - switch over to the vblank wait helper in the core after that since
         *   we don't need out special handling any more.
         */
        drm_atomic_helper_wait_for_flip_done(dev, state);

        /*
         * Now that the vblank has passed, we can go ahead and program the
         * optimal watermarks on platforms that need two-step watermark
         * programming.
         *
         * TODO: Move this (and other cleanup) to an async worker eventually.
         */
        for_each_new_crtc_in_state(state, crtc, new_crtc_state, i) {
                intel_cstate = to_intel_crtc_state(new_crtc_state);

                if (dev_priv->display.optimize_watermarks)
                        dev_priv->display.optimize_watermarks(intel_state,
                                                              intel_cstate);
        }

        for_each_oldnew_crtc_in_state(state, crtc, old_crtc_state, new_crtc_state, i) {
                intel_post_plane_update(to_intel_crtc_state(old_crtc_state));

                if (put_domains[i])
                        modeset_put_power_domains(dev_priv, put_domains[i]);

                intel_modeset_verify_crtc(crtc, state, old_crtc_state, new_crtc_state);
        }

        if (intel_state->modeset)
                intel_verify_planes(intel_state);

        if (intel_state->modeset && intel_can_enable_sagv(state))
                intel_enable_sagv(dev_priv);

        drm_atomic_helper_commit_hw_done(state);

        if (intel_state->modeset) {
                /* As one of the primary mmio accessors, KMS has a high
                 * likelihood of triggering bugs in unclaimed access. After we
                 * finish modesetting, see if an error has been flagged, and if
                 * so enable debugging for the next modeset - and hope we catch
                 * the culprit.
                 */
                intel_uncore_arm_unclaimed_mmio_detection(dev_priv);
                intel_display_power_put(dev_priv, POWER_DOMAIN_MODESET);
        }

        /*
         * Defer the cleanup of the old state to a separate worker to not
         * impede the current task (userspace for blocking modesets) that
         * are executed inline. For out-of-line asynchronous modesets/flips,
         * deferring to a new worker seems overkill, but we would place a
         * schedule point (cond_resched()) here anyway to keep latencies
         * down.
         */
        INIT_WORK(&state->commit_work, intel_atomic_cleanup_work);
        queue_work(system_highpri_wq, &state->commit_work);
}

static void intel_atomic_commit_work(struct work_struct *work)
{
        struct drm_atomic_state *state =
                container_of(work, struct drm_atomic_state, commit_work);

        intel_atomic_commit_tail(state);
}

static int __i915_sw_fence_call
intel_atomic_commit_ready(struct i915_sw_fence *fence,
                          enum i915_sw_fence_notify notify)
{
        struct intel_atomic_state *state =
                container_of(fence, struct intel_atomic_state, commit_ready);

        switch (notify) {
        case FENCE_COMPLETE:
                /* we do blocking waits in the worker, nothing to do here */
                break;
        case FENCE_FREE:
                {
                        struct intel_atomic_helper *helper =
                                &to_i915(state->base.dev)->atomic_helper;

                        if (llist_add(&state->freed, &helper->free_list))
                                schedule_work(&helper->free_work);
                        break;
                }
        }

        return NOTIFY_DONE;
}

static void intel_atomic_track_fbs(struct drm_atomic_state *state)
{
        struct drm_plane_state *old_plane_state, *new_plane_state;
        struct drm_plane *plane;
        int i;

        for_each_oldnew_plane_in_state(state, plane, old_plane_state, new_plane_state, i)
                i915_gem_track_fb(intel_fb_obj(old_plane_state->fb),
                                  intel_fb_obj(new_plane_state->fb),
                                  to_intel_plane(plane)->frontbuffer_bit);
}

/**
 * intel_atomic_commit - commit validated state object
 * @dev: DRM device
 * @state: the top-level driver state object
 * @nonblock: nonblocking commit
 *
 * This function commits a top-level state object that has been validated
 * with drm_atomic_helper_check().
 *
 * RETURNS
 * Zero for success or -errno.
 */
static int intel_atomic_commit(struct drm_device *dev,
                               struct drm_atomic_state *state,
                               bool nonblock)
{
        struct intel_atomic_state *intel_state = to_intel_atomic_state(state);
        struct drm_i915_private *dev_priv = to_i915(dev);
        int ret = 0;

        drm_atomic_state_get(state);
        i915_sw_fence_init(&intel_state->commit_ready,
                           intel_atomic_commit_ready);

        /*
         * The intel_legacy_cursor_update() fast path takes care
         * of avoiding the vblank waits for simple cursor
         * movement and flips. For cursor on/off and size changes,
         * we want to perform the vblank waits so that watermark
         * updates happen during the correct frames. Gen9+ have
         * double buffered watermarks and so shouldn't need this.
         *
         * Unset state->legacy_cursor_update before the call to
         * drm_atomic_helper_setup_commit() because otherwise
         * drm_atomic_helper_wait_for_flip_done() is a noop and
         * we get FIFO underruns because we didn't wait
         * for vblank.
         *
         * FIXME doing watermarks and fb cleanup from a vblank worker
         * (assuming we had any) would solve these problems.
         */
        if (INTEL_GEN(dev_priv) < 9 && state->legacy_cursor_update) {
                struct intel_crtc_state *new_crtc_state;
                struct intel_crtc *crtc;
                int i;

                for_each_new_intel_crtc_in_state(intel_state, crtc, new_crtc_state, i)
                        if (new_crtc_state->wm.need_postvbl_update ||
                            new_crtc_state->update_wm_post)
                                state->legacy_cursor_update = false;
        }

        ret = intel_atomic_prepare_commit(dev, state);
        if (ret) {
                DRM_DEBUG_ATOMIC("Preparing state failed with %i\n", ret);
                i915_sw_fence_commit(&intel_state->commit_ready);
                return ret;
        }

        ret = drm_atomic_helper_setup_commit(state, nonblock);
        if (!ret)
                ret = drm_atomic_helper_swap_state(state, true);

        if (ret) {
                i915_sw_fence_commit(&intel_state->commit_ready);

                drm_atomic_helper_cleanup_planes(dev, state);
                return ret;
        }
        dev_priv->wm.distrust_bios_wm = false;
        intel_shared_dpll_swap_state(state);
        intel_atomic_track_fbs(state);

        if (intel_state->modeset) {
                memcpy(dev_priv->min_cdclk, intel_state->min_cdclk,
                       sizeof(intel_state->min_cdclk));
                memcpy(dev_priv->min_voltage_level,
                       intel_state->min_voltage_level,
                       sizeof(intel_state->min_voltage_level));
                dev_priv->active_crtcs = intel_state->active_crtcs;
                dev_priv->cdclk.logical = intel_state->cdclk.logical;
                dev_priv->cdclk.actual = intel_state->cdclk.actual;
        }

        drm_atomic_state_get(state);
        INIT_WORK(&state->commit_work, intel_atomic_commit_work);

        i915_sw_fence_commit(&intel_state->commit_ready);
        if (nonblock && intel_state->modeset) {
                queue_work(dev_priv->modeset_wq, &state->commit_work);
        } else if (nonblock) {
                queue_work(system_unbound_wq, &state->commit_work);
        } else {
                if (intel_state->modeset)
                        flush_workqueue(dev_priv->modeset_wq);
                intel_atomic_commit_tail(state);
        }

        return 0;
}

static const struct drm_crtc_funcs intel_crtc_funcs = {
        .gamma_set = drm_atomic_helper_legacy_gamma_set,
        .set_config = drm_atomic_helper_set_config,
        .destroy = intel_crtc_destroy,
        .page_flip = drm_atomic_helper_page_flip,
        .atomic_duplicate_state = intel_crtc_duplicate_state,
        .atomic_destroy_state = intel_crtc_destroy_state,
        .set_crc_source = intel_crtc_set_crc_source,
        .verify_crc_source = intel_crtc_verify_crc_source,
        .get_crc_sources = intel_crtc_get_crc_sources,
};

struct wait_rps_boost {
        struct wait_queue_entry wait;

        struct drm_crtc *crtc;
        struct i915_request *request;
};

static int do_rps_boost(struct wait_queue_entry *_wait,
                        unsigned mode, int sync, void *key)
{
        struct wait_rps_boost *wait = container_of(_wait, typeof(*wait), wait);
        struct i915_request *rq = wait->request;

        /*
         * If we missed the vblank, but the request is already running it
         * is reasonable to assume that it will complete before the next
         * vblank without our intervention, so leave RPS alone.
         */
        if (!i915_request_started(rq))
                gen6_rps_boost(rq, NULL);
        i915_request_put(rq);

        drm_crtc_vblank_put(wait->crtc);

        list_del(&wait->wait.entry);
        kfree(wait);
        return 1;
}

static void add_rps_boost_after_vblank(struct drm_crtc *crtc,
                                       struct dma_fence *fence)
{
        struct wait_rps_boost *wait;

        if (!dma_fence_is_i915(fence))
                return;

        if (INTEL_GEN(to_i915(crtc->dev)) < 6)
                return;

        if (drm_crtc_vblank_get(crtc))
                return;

        wait = kmalloc(sizeof(*wait), M_DRM, GFP_KERNEL);
        if (!wait) {
                drm_crtc_vblank_put(crtc);
                return;
        }

        wait->request = to_request(dma_fence_get(fence));
        wait->crtc = crtc;

        wait->wait.func = do_rps_boost;
        wait->wait.flags = 0;

        add_wait_queue(drm_crtc_vblank_waitqueue(crtc), &wait->wait);
}

static int intel_plane_pin_fb(struct intel_plane_state *plane_state)
{
        struct intel_plane *plane = to_intel_plane(plane_state->base.plane);
        struct drm_i915_private *dev_priv = to_i915(plane->base.dev);
        struct drm_framebuffer *fb = plane_state->base.fb;
        struct i915_vma *vma;

        if (plane->id == PLANE_CURSOR &&
            INTEL_INFO(dev_priv)->cursor_needs_physical) {
                struct drm_i915_gem_object *obj = intel_fb_obj(fb);
                const int align = intel_cursor_alignment(dev_priv);
                int err;

                err = i915_gem_object_attach_phys(obj, align);
                if (err)
                        return err;
        }

        vma = intel_pin_and_fence_fb_obj(fb,
                                         &plane_state->view,
                                         intel_plane_uses_fence(plane_state),
                                         &plane_state->flags);
        if (IS_ERR(vma))
                return PTR_ERR(vma);

        plane_state->vma = vma;

        return 0;
}

static void intel_plane_unpin_fb(struct intel_plane_state *old_plane_state)
{
        struct i915_vma *vma;

        vma = fetch_and_zero(&old_plane_state->vma);
        if (vma)
                intel_unpin_fb_vma(vma, old_plane_state->flags);
}

static void fb_obj_bump_render_priority(struct drm_i915_gem_object *obj)
{
        struct i915_sched_attr attr = {
                .priority = I915_PRIORITY_DISPLAY,
        };

        i915_gem_object_wait_priority(obj, 0, &attr);
}

/**
 * intel_prepare_plane_fb - Prepare fb for usage on plane
 * @plane: drm plane to prepare for
 * @new_state: the plane state being prepared
 *
 * Prepares a framebuffer for usage on a display plane.  Generally this
 * involves pinning the underlying object and updating the frontbuffer tracking
 * bits.  Some older platforms need special physical address handling for
 * cursor planes.
 *
 * Must be called with struct_mutex held.
 *
 * Returns 0 on success, negative error code on failure.
 */
int
intel_prepare_plane_fb(struct drm_plane *plane,
                       struct drm_plane_state *new_state)
{
        struct intel_atomic_state *intel_state =
                to_intel_atomic_state(new_state->state);
        struct drm_i915_private *dev_priv = to_i915(plane->dev);
        struct drm_framebuffer *fb = new_state->fb;
        struct drm_i915_gem_object *obj = intel_fb_obj(fb);
        struct drm_i915_gem_object *old_obj = intel_fb_obj(plane->state->fb);
        int ret;

        if (old_obj) {
                struct drm_crtc_state *crtc_state =
                        drm_atomic_get_new_crtc_state(new_state->state,
                                                      plane->state->crtc);

                /* Big Hammer, we also need to ensure that any pending
                 * MI_WAIT_FOR_EVENT inside a user batch buffer on the
                 * current scanout is retired before unpinning the old
                 * framebuffer. Note that we rely on userspace rendering
                 * into the buffer attached to the pipe they are waiting
                 * on. If not, userspace generates a GPU hang with IPEHR
                 * point to the MI_WAIT_FOR_EVENT.
                 *
                 * This should only fail upon a hung GPU, in which case we
                 * can safely continue.
                 */
                if (needs_modeset(crtc_state)) {
                        ret = i915_sw_fence_await_reservation(&intel_state->commit_ready,
                                                              old_obj->resv, NULL,
                                                              false, 0,
                                                              GFP_KERNEL);
                        if (ret < 0)
                                return ret;
                }
        }

        if (new_state->fence) { /* explicit fencing */
                ret = i915_sw_fence_await_dma_fence(&intel_state->commit_ready,
                                                    new_state->fence,
                                                    I915_FENCE_TIMEOUT,
                                                    GFP_KERNEL);
                if (ret < 0)
                        return ret;
        }

        if (!obj)
                return 0;

        ret = i915_gem_object_pin_pages(obj);
        if (ret)
                return ret;

        ret = mutex_lock_interruptible(&dev_priv->drm.struct_mutex);
        if (ret) {
                i915_gem_object_unpin_pages(obj);
                return ret;
        }

        ret = intel_plane_pin_fb(to_intel_plane_state(new_state));

        fb_obj_bump_render_priority(obj);

        mutex_unlock(&dev_priv->drm.struct_mutex);
        i915_gem_object_unpin_pages(obj);
        if (ret)
                return ret;

        intel_fb_obj_flush(obj, ORIGIN_DIRTYFB);

        if (!new_state->fence) { /* implicit fencing */
                struct dma_fence *fence;

                ret = i915_sw_fence_await_reservation(&intel_state->commit_ready,
                                                      obj->resv, NULL,
                                                      false, I915_FENCE_TIMEOUT,
                                                      GFP_KERNEL);
                if (ret < 0)
                        return ret;

                fence = reservation_object_get_excl_rcu(obj->resv);
                if (fence) {
                        add_rps_boost_after_vblank(new_state->crtc, fence);
                        dma_fence_put(fence);
                }
        } else {
                add_rps_boost_after_vblank(new_state->crtc, new_state->fence);
        }

        /*
         * We declare pageflips to be interactive and so merit a small bias
         * towards upclocking to deliver the frame on time. By only changing
         * the RPS thresholds to sample more regularly and aim for higher
         * clocks we can hopefully deliver low power workloads (like kodi)
         * that are not quite steady state without resorting to forcing
         * maximum clocks following a vblank miss (see do_rps_boost()).
         */
        if (!intel_state->rps_interactive) {
                intel_rps_mark_interactive(dev_priv, true);
                intel_state->rps_interactive = true;
        }

        return 0;
}

/**
 * intel_cleanup_plane_fb - Cleans up an fb after plane use
 * @plane: drm plane to clean up for
 * @old_state: the state from the previous modeset
 *
 * Cleans up a framebuffer that has just been removed from a plane.
 *
 * Must be called with struct_mutex held.
 */
void
intel_cleanup_plane_fb(struct drm_plane *plane,
                       struct drm_plane_state *old_state)
{
        struct intel_atomic_state *intel_state =
                to_intel_atomic_state(old_state->state);
        struct drm_i915_private *dev_priv = to_i915(plane->dev);

        if (intel_state->rps_interactive) {
                intel_rps_mark_interactive(dev_priv, false);
                intel_state->rps_interactive = false;
        }

        /* Should only be called after a successful intel_prepare_plane_fb()! */
        mutex_lock(&dev_priv->drm.struct_mutex);
        intel_plane_unpin_fb(to_intel_plane_state(old_state));
        mutex_unlock(&dev_priv->drm.struct_mutex);
}

int
skl_max_scale(const struct intel_crtc_state *crtc_state,
              u32 pixel_format)
{
        struct intel_crtc *crtc = to_intel_crtc(crtc_state->base.crtc);
        struct drm_i915_private *dev_priv = to_i915(crtc->base.dev);
        int max_scale, mult;
        int crtc_clock, max_dotclk, tmpclk1, tmpclk2;

        if (!crtc_state->base.enable)
                return DRM_PLANE_HELPER_NO_SCALING;

        crtc_clock = crtc_state->base.adjusted_mode.crtc_clock;
        max_dotclk = to_intel_atomic_state(crtc_state->base.state)->cdclk.logical.cdclk;

        if (IS_GEMINILAKE(dev_priv) || INTEL_GEN(dev_priv) >= 10)
                max_dotclk *= 2;

        if (WARN_ON_ONCE(!crtc_clock || max_dotclk < crtc_clock))
                return DRM_PLANE_HELPER_NO_SCALING;

        /*
         * skl max scale is lower of:
         *    close to 3 but not 3, -1 is for that purpose
         *            or
         *    cdclk/crtc_clock
         */
        mult = pixel_format == DRM_FORMAT_NV12 ? 2 : 3;
        tmpclk1 = (1 << 16) * mult - 1;
        tmpclk2 = (1 << 8) * ((max_dotclk << 8) / crtc_clock);
        max_scale = min(tmpclk1, tmpclk2);

        return max_scale;
}

static void intel_begin_crtc_commit(struct drm_crtc *crtc,
                                    struct drm_crtc_state *old_crtc_state)
{
        struct drm_device *dev = crtc->dev;
        struct drm_i915_private *dev_priv = to_i915(dev);
        struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
        struct intel_crtc_state *old_intel_cstate =
                to_intel_crtc_state(old_crtc_state);
        struct intel_atomic_state *old_intel_state =
                to_intel_atomic_state(old_crtc_state->state);
        struct intel_crtc_state *intel_cstate =
                intel_atomic_get_new_crtc_state(old_intel_state, intel_crtc);
        bool modeset = needs_modeset(&intel_cstate->base);

        if (!modeset &&
            (intel_cstate->base.color_mgmt_changed ||
             intel_cstate->update_pipe)) {
                intel_color_set_csc(&intel_cstate->base);
                intel_color_load_luts(&intel_cstate->base);
        }

        /* Perform vblank evasion around commit operation */
        intel_pipe_update_start(intel_cstate);

        if (modeset)
                goto out;

        if (intel_cstate->update_pipe)
                intel_update_pipe_config(old_intel_cstate, intel_cstate);
        else if (INTEL_GEN(dev_priv) >= 9)
                skl_detach_scalers(intel_crtc);

out:
        if (dev_priv->display.atomic_update_watermarks)
                dev_priv->display.atomic_update_watermarks(old_intel_state,
                                                           intel_cstate);
}

void intel_crtc_arm_fifo_underrun(struct intel_crtc *crtc,
                                  struct intel_crtc_state *crtc_state)
{
        struct drm_i915_private *dev_priv = to_i915(crtc->base.dev);

        if (!IS_GEN2(dev_priv))
                intel_set_cpu_fifo_underrun_reporting(dev_priv, crtc->pipe, true);

        if (crtc_state->has_pch_encoder) {
                enum i915_pipe pch_transcoder =
                        intel_crtc_pch_transcoder(crtc);

                intel_set_pch_fifo_underrun_reporting(dev_priv, pch_transcoder, true);
        }
}

static void intel_finish_crtc_commit(struct drm_crtc *crtc,
                                     struct drm_crtc_state *old_crtc_state)
{
        struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
        struct intel_atomic_state *old_intel_state =
                to_intel_atomic_state(old_crtc_state->state);
        struct intel_crtc_state *new_crtc_state =
                intel_atomic_get_new_crtc_state(old_intel_state, intel_crtc);

        intel_pipe_update_end(new_crtc_state);

        if (new_crtc_state->update_pipe &&
            !needs_modeset(&new_crtc_state->base) &&
            old_crtc_state->mode.private_flags & I915_MODE_FLAG_INHERITED)
                intel_crtc_arm_fifo_underrun(intel_crtc, new_crtc_state);
}

/**
 * intel_plane_destroy - destroy a plane
 * @plane: plane to destroy
 *
 * Common destruction function for all types of planes (primary, cursor,
 * sprite).
 */
void intel_plane_destroy(struct drm_plane *plane)
{
        drm_plane_cleanup(plane);
        kfree(to_intel_plane(plane));
}

static bool i8xx_plane_format_mod_supported(struct drm_plane *_plane,
                                            u32 format, uint64_t modifier)
{
        switch (modifier) {
        case DRM_FORMAT_MOD_LINEAR:
        case I915_FORMAT_MOD_X_TILED:
                break;
        default:
                return false;
        }

        switch (format) {
        case DRM_FORMAT_C8:
        case DRM_FORMAT_RGB565:
        case DRM_FORMAT_XRGB1555:
        case DRM_FORMAT_XRGB8888:
                return modifier == DRM_FORMAT_MOD_LINEAR ||
                        modifier == I915_FORMAT_MOD_X_TILED;
        default:
                return false;
        }
}

static bool i965_plane_format_mod_supported(struct drm_plane *_plane,
                                            u32 format, uint64_t modifier)
{
        switch (modifier) {
        case DRM_FORMAT_MOD_LINEAR:
        case I915_FORMAT_MOD_X_TILED:
                break;
        default:
                return false;
        }

        switch (format) {
        case DRM_FORMAT_C8:
        case DRM_FORMAT_RGB565:
        case DRM_FORMAT_XRGB8888:
        case DRM_FORMAT_XBGR8888:
        case DRM_FORMAT_XRGB2101010:
        case DRM_FORMAT_XBGR2101010:
                return modifier == DRM_FORMAT_MOD_LINEAR ||
                        modifier == I915_FORMAT_MOD_X_TILED;
        default:
                return false;
        }
}

static bool skl_plane_format_mod_supported(struct drm_plane *_plane,
                                           u32 format, uint64_t modifier)
{
        struct intel_plane *plane = to_intel_plane(_plane);

        switch (modifier) {
        case DRM_FORMAT_MOD_LINEAR:
        case I915_FORMAT_MOD_X_TILED:
        case I915_FORMAT_MOD_Y_TILED:
        case I915_FORMAT_MOD_Yf_TILED:
                break;
        case I915_FORMAT_MOD_Y_TILED_CCS:
        case I915_FORMAT_MOD_Yf_TILED_CCS:
                if (!plane->has_ccs)
                        return false;
                break;
        default:
                return false;
        }

        switch (format) {
        case DRM_FORMAT_XRGB8888:
        case DRM_FORMAT_XBGR8888:
        case DRM_FORMAT_ARGB8888:
        case DRM_FORMAT_ABGR8888:
                if (is_ccs_modifier(modifier))
                        return true;
                /* fall through */
        case DRM_FORMAT_RGB565:
        case DRM_FORMAT_XRGB2101010:
        case DRM_FORMAT_XBGR2101010:
        case DRM_FORMAT_YUYV:
        case DRM_FORMAT_YVYU:
        case DRM_FORMAT_UYVY:
        case DRM_FORMAT_VYUY:
        case DRM_FORMAT_NV12:
                if (modifier == I915_FORMAT_MOD_Yf_TILED)
                        return true;
                /* fall through */
        case DRM_FORMAT_C8:
                if (modifier == DRM_FORMAT_MOD_LINEAR ||
                    modifier == I915_FORMAT_MOD_X_TILED ||
                    modifier == I915_FORMAT_MOD_Y_TILED)
                        return true;
                /* fall through */
        default:
                return false;
        }
}

static bool intel_cursor_format_mod_supported(struct drm_plane *_plane,
                                              u32 format, uint64_t modifier)
{
        return modifier == DRM_FORMAT_MOD_LINEAR &&
                format == DRM_FORMAT_ARGB8888;
}

static struct drm_plane_funcs skl_plane_funcs = {
        .update_plane = drm_atomic_helper_update_plane,
        .disable_plane = drm_atomic_helper_disable_plane,
        .destroy = intel_plane_destroy,
        .atomic_get_property = intel_plane_atomic_get_property,
        .atomic_set_property = intel_plane_atomic_set_property,
        .atomic_duplicate_state = intel_plane_duplicate_state,
        .atomic_destroy_state = intel_plane_destroy_state,
        .format_mod_supported = skl_plane_format_mod_supported,
};

static struct drm_plane_funcs i965_plane_funcs = {
        .update_plane = drm_atomic_helper_update_plane,
        .disable_plane = drm_atomic_helper_disable_plane,
        .destroy = intel_plane_destroy,
        .atomic_get_property = intel_plane_atomic_get_property,
        .atomic_set_property = intel_plane_atomic_set_property,
        .atomic_duplicate_state = intel_plane_duplicate_state,
        .atomic_destroy_state = intel_plane_destroy_state,
        .format_mod_supported = i965_plane_format_mod_supported,
};

static struct drm_plane_funcs i8xx_plane_funcs = {
        .update_plane = drm_atomic_helper_update_plane,
        .disable_plane = drm_atomic_helper_disable_plane,
        .destroy = intel_plane_destroy,
        .atomic_get_property = intel_plane_atomic_get_property,
        .atomic_set_property = intel_plane_atomic_set_property,
        .atomic_duplicate_state = intel_plane_duplicate_state,
        .atomic_destroy_state = intel_plane_destroy_state,
        .format_mod_supported = i8xx_plane_format_mod_supported,
};

static int
intel_legacy_cursor_update(struct drm_plane *plane,
                           struct drm_crtc *crtc,
                           struct drm_framebuffer *fb,
                           int crtc_x, int crtc_y,
                           unsigned int crtc_w, unsigned int crtc_h,
                           uint32_t src_x, uint32_t src_y,
                           uint32_t src_w, uint32_t src_h,
                           struct drm_modeset_acquire_ctx *ctx)
{
        struct drm_i915_private *dev_priv = to_i915(crtc->dev);
        int ret;
        struct drm_plane_state *old_plane_state, *new_plane_state;
        struct intel_plane *intel_plane = to_intel_plane(plane);
        struct drm_framebuffer *old_fb;
        struct drm_crtc_state *crtc_state = crtc->state;

        /*
         * When crtc is inactive or there is a modeset pending,
         * wait for it to complete in the slowpath
         */
        if (!crtc_state->active || needs_modeset(crtc_state) ||
            to_intel_crtc_state(crtc_state)->update_pipe)
                goto slow;

        old_plane_state = plane->state;
        /*
         * Don't do an async update if there is an outstanding commit modifying
         * the plane.  This prevents our async update's changes from getting
         * overridden by a previous synchronous update's state.
         */
        if (old_plane_state->commit &&
            !try_wait_for_completion(&old_plane_state->commit->hw_done))
                goto slow;

        /*
         * If any parameters change that may affect watermarks,
         * take the slowpath. Only changing fb or position should be
         * in the fastpath.
         */
        if (old_plane_state->crtc != crtc ||
            old_plane_state->src_w != src_w ||
            old_plane_state->src_h != src_h ||
            old_plane_state->crtc_w != crtc_w ||
            old_plane_state->crtc_h != crtc_h ||
            !old_plane_state->fb != !fb)
                goto slow;

        new_plane_state = intel_plane_duplicate_state(plane);
        if (!new_plane_state)
                return -ENOMEM;

        drm_atomic_set_fb_for_plane(new_plane_state, fb);

        new_plane_state->src_x = src_x;
        new_plane_state->src_y = src_y;
        new_plane_state->src_w = src_w;
        new_plane_state->src_h = src_h;
        new_plane_state->crtc_x = crtc_x;
        new_plane_state->crtc_y = crtc_y;
        new_plane_state->crtc_w = crtc_w;
        new_plane_state->crtc_h = crtc_h;

        ret = intel_plane_atomic_check_with_state(to_intel_crtc_state(crtc->state),
                                                  to_intel_crtc_state(crtc->state), /* FIXME need a new crtc state? */
                                                  to_intel_plane_state(plane->state),
                                                  to_intel_plane_state(new_plane_state));
        if (ret)
                goto out_free;

        ret = mutex_lock_interruptible(&dev_priv->drm.struct_mutex);
        if (ret)
                goto out_free;

        ret = intel_plane_pin_fb(to_intel_plane_state(new_plane_state));
        if (ret)
                goto out_unlock;

        intel_fb_obj_flush(intel_fb_obj(fb), ORIGIN_FLIP);

        old_fb = old_plane_state->fb;
        i915_gem_track_fb(intel_fb_obj(old_fb), intel_fb_obj(fb),
                          intel_plane->frontbuffer_bit);

        /* Swap plane state */
        plane->state = new_plane_state;

        if (plane->state->visible) {
                trace_intel_update_plane(plane, to_intel_crtc(crtc));
                intel_plane->update_plane(intel_plane,
                                          to_intel_crtc_state(crtc->state),
                                          to_intel_plane_state(plane->state));
        } else {
                trace_intel_disable_plane(plane, to_intel_crtc(crtc));
                intel_plane->disable_plane(intel_plane, to_intel_crtc(crtc));
        }

        intel_plane_unpin_fb(to_intel_plane_state(old_plane_state));

out_unlock:
        mutex_unlock(&dev_priv->drm.struct_mutex);
out_free:
        if (ret)
                intel_plane_destroy_state(plane, new_plane_state);
        else
                intel_plane_destroy_state(plane, old_plane_state);
        return ret;

slow:
        return drm_atomic_helper_update_plane(plane, crtc, fb,
                                              crtc_x, crtc_y, crtc_w, crtc_h,
                                              src_x, src_y, src_w, src_h, ctx);
}

static const struct drm_plane_funcs intel_cursor_plane_funcs = {
        .update_plane = intel_legacy_cursor_update,
        .disable_plane = drm_atomic_helper_disable_plane,
        .destroy = intel_plane_destroy,
        .atomic_get_property = intel_plane_atomic_get_property,
        .atomic_set_property = intel_plane_atomic_set_property,
        .atomic_duplicate_state = intel_plane_duplicate_state,
        .atomic_destroy_state = intel_plane_destroy_state,
        .format_mod_supported = intel_cursor_format_mod_supported,
};

static bool i9xx_plane_has_fbc(struct drm_i915_private *dev_priv,
                               enum i9xx_plane_id i9xx_plane)
{
        if (!HAS_FBC(dev_priv))
                return false;

        if (IS_BROADWELL(dev_priv) || IS_HASWELL(dev_priv))
                return i9xx_plane == PLANE_A; /* tied to pipe A */
        else if (IS_IVYBRIDGE(dev_priv))
                return i9xx_plane == PLANE_A || i9xx_plane == PLANE_B ||
                        i9xx_plane == PLANE_C;
        else if (INTEL_GEN(dev_priv) >= 4)
                return i9xx_plane == PLANE_A || i9xx_plane == PLANE_B;
        else
                return i9xx_plane == PLANE_A;
}

static bool skl_plane_has_fbc(struct drm_i915_private *dev_priv,
                              enum i915_pipe pipe, enum plane_id plane_id)
{
        if (!HAS_FBC(dev_priv))
                return false;

        return pipe == PIPE_A && plane_id == PLANE_PRIMARY;
}

bool skl_plane_has_planar(struct drm_i915_private *dev_priv,
                          enum i915_pipe pipe, enum plane_id plane_id)
{
        /*
         * FIXME: ICL requires two hardware planes for scanning out NV12
         * framebuffers. Do not advertize support until this is implemented.
         */
        if (INTEL_GEN(dev_priv) >= 11)
                return false;

        if (IS_SKYLAKE(dev_priv) || IS_BROXTON(dev_priv))
                return false;

        if (INTEL_GEN(dev_priv) == 9 && !IS_GEMINILAKE(dev_priv) && pipe == PIPE_C)
                return false;

        if (plane_id != PLANE_PRIMARY && plane_id != PLANE_SPRITE0)
                return false;

        return true;
}

static struct intel_plane *
intel_primary_plane_create(struct drm_i915_private *dev_priv, enum i915_pipe pipe)
{
        struct intel_plane *primary = NULL;
        struct intel_plane_state *state = NULL;
        const struct drm_plane_funcs *plane_funcs;
        const uint32_t *intel_primary_formats;
        unsigned int supported_rotations;
        unsigned int num_formats;
        const uint64_t *modifiers;
        int ret;

        primary = kzalloc(sizeof(*primary), GFP_KERNEL);
        if (!primary) {
                ret = -ENOMEM;
                goto fail;
        }

        state = intel_create_plane_state(&primary->base);
        if (!state) {
                ret = -ENOMEM;
                goto fail;
        }

        primary->base.state = &state->base;

        if (INTEL_GEN(dev_priv) >= 9)
                state->scaler_id = -1;
        primary->pipe = pipe;
        /*
         * On gen2/3 only plane A can do FBC, but the panel fitter and LVDS
         * port is hooked to pipe B. Hence we want plane A feeding pipe B.
         */
        if (HAS_FBC(dev_priv) && INTEL_GEN(dev_priv) < 4)
                primary->i9xx_plane = (enum i9xx_plane_id) !pipe;
        else
                primary->i9xx_plane = (enum i9xx_plane_id) pipe;
        primary->id = PLANE_PRIMARY;
        primary->frontbuffer_bit = INTEL_FRONTBUFFER(pipe, primary->id);

        if (INTEL_GEN(dev_priv) >= 9)
                primary->has_fbc = skl_plane_has_fbc(dev_priv,
                                                     primary->pipe,
                                                     primary->id);
        else
                primary->has_fbc = i9xx_plane_has_fbc(dev_priv,
                                                      primary->i9xx_plane);

        if (primary->has_fbc) {
                struct intel_fbc *fbc = &dev_priv->fbc;

                fbc->possible_framebuffer_bits |= primary->frontbuffer_bit;
        }

        if (INTEL_GEN(dev_priv) >= 9) {
                primary->has_ccs = skl_plane_has_ccs(dev_priv, pipe,
                                                     PLANE_PRIMARY);

                if (skl_plane_has_planar(dev_priv, pipe, PLANE_PRIMARY)) {
                        intel_primary_formats = skl_pri_planar_formats;
                        num_formats = ARRAY_SIZE(skl_pri_planar_formats);
                } else {
                        intel_primary_formats = skl_primary_formats;
                        num_formats = ARRAY_SIZE(skl_primary_formats);
                }

                if (primary->has_ccs)
                        modifiers = skl_format_modifiers_ccs;
                else
                        modifiers = skl_format_modifiers_noccs;

                primary->max_stride = skl_plane_max_stride;
                primary->update_plane = skl_update_plane;
                primary->disable_plane = skl_disable_plane;
                primary->get_hw_state = skl_plane_get_hw_state;
                primary->check_plane = skl_plane_check;

                plane_funcs = &skl_plane_funcs;
        } else if (INTEL_GEN(dev_priv) >= 4) {
                intel_primary_formats = i965_primary_formats;
                num_formats = ARRAY_SIZE(i965_primary_formats);
                modifiers = i9xx_format_modifiers;

                primary->max_stride = i9xx_plane_max_stride;
                primary->update_plane = i9xx_update_plane;
                primary->disable_plane = i9xx_disable_plane;
                primary->get_hw_state = i9xx_plane_get_hw_state;
                primary->check_plane = i9xx_plane_check;

                plane_funcs = &i965_plane_funcs;
        } else {
                intel_primary_formats = i8xx_primary_formats;
                num_formats = ARRAY_SIZE(i8xx_primary_formats);
                modifiers = i9xx_format_modifiers;

                primary->max_stride = i9xx_plane_max_stride;
                primary->update_plane = i9xx_update_plane;
                primary->disable_plane = i9xx_disable_plane;
                primary->get_hw_state = i9xx_plane_get_hw_state;
                primary->check_plane = i9xx_plane_check;

                plane_funcs = &i8xx_plane_funcs;
        }

        if (INTEL_GEN(dev_priv) >= 9)
                ret = drm_universal_plane_init(&dev_priv->drm, &primary->base,
                                               0, plane_funcs,
                                               intel_primary_formats, num_formats,
                                               modifiers,
                                               DRM_PLANE_TYPE_PRIMARY,
                                               "plane 1%c", pipe_name(pipe));
        else if (INTEL_GEN(dev_priv) >= 5 || IS_G4X(dev_priv))
                ret = drm_universal_plane_init(&dev_priv->drm, &primary->base,
                                               0, plane_funcs,
                                               intel_primary_formats, num_formats,
                                               modifiers,
                                               DRM_PLANE_TYPE_PRIMARY,
                                               "primary %c", pipe_name(pipe));
        else
                ret = drm_universal_plane_init(&dev_priv->drm, &primary->base,
                                               0, plane_funcs,
                                               intel_primary_formats, num_formats,
                                               modifiers,
                                               DRM_PLANE_TYPE_PRIMARY,
                                               "plane %c",
                                               plane_name(primary->i9xx_plane));
        if (ret)
                goto fail;

        if (INTEL_GEN(dev_priv) >= 10) {
                supported_rotations =
                        DRM_MODE_ROTATE_0 | DRM_MODE_ROTATE_90 |
                        DRM_MODE_ROTATE_180 | DRM_MODE_ROTATE_270 |
                        DRM_MODE_REFLECT_X;
        } else if (INTEL_GEN(dev_priv) >= 9) {
                supported_rotations =
                        DRM_MODE_ROTATE_0 | DRM_MODE_ROTATE_90 |
                        DRM_MODE_ROTATE_180 | DRM_MODE_ROTATE_270;
        } else if (IS_CHERRYVIEW(dev_priv) && pipe == PIPE_B) {
                supported_rotations =
                        DRM_MODE_ROTATE_0 | DRM_MODE_ROTATE_180 |
                        DRM_MODE_REFLECT_X;
        } else if (INTEL_GEN(dev_priv) >= 4) {
                supported_rotations =
                        DRM_MODE_ROTATE_0 | DRM_MODE_ROTATE_180;
        } else {
                supported_rotations = DRM_MODE_ROTATE_0;
        }

        if (INTEL_GEN(dev_priv) >= 4)
                drm_plane_create_rotation_property(&primary->base,
                                                   DRM_MODE_ROTATE_0,
                                                   supported_rotations);

        if (INTEL_GEN(dev_priv) >= 9)
                drm_plane_create_color_properties(&primary->base,
                                                  BIT(DRM_COLOR_YCBCR_BT601) |
                                                  BIT(DRM_COLOR_YCBCR_BT709),
                                                  BIT(DRM_COLOR_YCBCR_LIMITED_RANGE) |
                                                  BIT(DRM_COLOR_YCBCR_FULL_RANGE),
                                                  DRM_COLOR_YCBCR_BT709,
                                                  DRM_COLOR_YCBCR_LIMITED_RANGE);

        drm_plane_helper_add(&primary->base, &intel_plane_helper_funcs);

        return primary;

fail:
        kfree(state);
        kfree(primary);

        return ERR_PTR(ret);
}

static struct intel_plane *
intel_cursor_plane_create(struct drm_i915_private *dev_priv,
                          enum i915_pipe pipe)
{
        struct intel_plane *cursor = NULL;
        struct intel_plane_state *state = NULL;
        int ret;

        cursor = kzalloc(sizeof(*cursor), GFP_KERNEL);
        if (!cursor) {
                ret = -ENOMEM;
                goto fail;
        }

        state = intel_create_plane_state(&cursor->base);
        if (!state) {
                ret = -ENOMEM;
                goto fail;
        }

        cursor->base.state = &state->base;

        cursor->pipe = pipe;
        cursor->i9xx_plane = (enum i9xx_plane_id) pipe;
        cursor->id = PLANE_CURSOR;
        cursor->frontbuffer_bit = INTEL_FRONTBUFFER(pipe, cursor->id);

        if (IS_I845G(dev_priv) || IS_I865G(dev_priv)) {
                cursor->max_stride = i845_cursor_max_stride;
                cursor->update_plane = i845_update_cursor;
                cursor->disable_plane = i845_disable_cursor;
                cursor->get_hw_state = i845_cursor_get_hw_state;
                cursor->check_plane = i845_check_cursor;
        } else {
                cursor->max_stride = i9xx_cursor_max_stride;
                cursor->update_plane = i9xx_update_cursor;
                cursor->disable_plane = i9xx_disable_cursor;
                cursor->get_hw_state = i9xx_cursor_get_hw_state;
                cursor->check_plane = i9xx_check_cursor;
        }

        cursor->cursor.base = ~0;
        cursor->cursor.cntl = ~0;

        if (IS_I845G(dev_priv) || IS_I865G(dev_priv) || HAS_CUR_FBC(dev_priv))
                cursor->cursor.size = ~0;

        ret = drm_universal_plane_init(&dev_priv->drm, &cursor->base,
                                       0, &intel_cursor_plane_funcs,
                                       intel_cursor_formats,
                                       ARRAY_SIZE(intel_cursor_formats),
                                       cursor_format_modifiers,
                                       DRM_PLANE_TYPE_CURSOR,
                                       "cursor %c", pipe_name(pipe));
        if (ret)
                goto fail;

        if (INTEL_GEN(dev_priv) >= 4)
                drm_plane_create_rotation_property(&cursor->base,
                                                   DRM_MODE_ROTATE_0,
                                                   DRM_MODE_ROTATE_0 |
                                                   DRM_MODE_ROTATE_180);

        if (INTEL_GEN(dev_priv) >= 9)
                state->scaler_id = -1;

        drm_plane_helper_add(&cursor->base, &intel_plane_helper_funcs);

        return cursor;

fail:
        kfree(state);
        kfree(cursor);

        return ERR_PTR(ret);
}

static void intel_crtc_init_scalers(struct intel_crtc *crtc,
                                    struct intel_crtc_state *crtc_state)
{
        struct intel_crtc_scaler_state *scaler_state =
                &crtc_state->scaler_state;
        struct drm_i915_private *dev_priv = to_i915(crtc->base.dev);
        int i;

        crtc->num_scalers = dev_priv->info.num_scalers[crtc->pipe];
        if (!crtc->num_scalers)
                return;

        for (i = 0; i < crtc->num_scalers; i++) {
                struct intel_scaler *scaler = &scaler_state->scalers[i];

                scaler->in_use = 0;
                scaler->mode = PS_SCALER_MODE_DYN;
        }

        scaler_state->scaler_id = -1;
}

static int intel_crtc_init(struct drm_i915_private *dev_priv, enum i915_pipe pipe)
{
        struct intel_crtc *intel_crtc;
        struct intel_crtc_state *crtc_state = NULL;
        struct intel_plane *primary = NULL;
        struct intel_plane *cursor = NULL;
        int sprite, ret;

        intel_crtc = kzalloc(sizeof(*intel_crtc), GFP_KERNEL);
        if (!intel_crtc)
                return -ENOMEM;

        crtc_state = kzalloc(sizeof(*crtc_state), GFP_KERNEL);
        if (!crtc_state) {
                ret = -ENOMEM;
                goto fail;
        }
        intel_crtc->config = crtc_state;
        intel_crtc->base.state = &crtc_state->base;
        crtc_state->base.crtc = &intel_crtc->base;

        primary = intel_primary_plane_create(dev_priv, pipe);
        if (IS_ERR(primary)) {
                ret = PTR_ERR(primary);
                goto fail;
        }
        intel_crtc->plane_ids_mask |= BIT(primary->id);

        for_each_sprite(dev_priv, pipe, sprite) {
                struct intel_plane *plane;

                plane = intel_sprite_plane_create(dev_priv, pipe, sprite);
                if (IS_ERR(plane)) {
                        ret = PTR_ERR(plane);
                        goto fail;
                }
                intel_crtc->plane_ids_mask |= BIT(plane->id);
        }

        cursor = intel_cursor_plane_create(dev_priv, pipe);
        if (IS_ERR(cursor)) {
                ret = PTR_ERR(cursor);
                goto fail;
        }
        intel_crtc->plane_ids_mask |= BIT(cursor->id);

        ret = drm_crtc_init_with_planes(&dev_priv->drm, &intel_crtc->base,
                                        &primary->base, &cursor->base,
                                        &intel_crtc_funcs,
                                        "pipe %c", pipe_name(pipe));
        if (ret)
                goto fail;

        intel_crtc->pipe = pipe;

        /* initialize shared scalers */
        intel_crtc_init_scalers(intel_crtc, crtc_state);

        BUG_ON(pipe >= ARRAY_SIZE(dev_priv->pipe_to_crtc_mapping) ||
               dev_priv->pipe_to_crtc_mapping[pipe] != NULL);
        dev_priv->pipe_to_crtc_mapping[pipe] = intel_crtc;

        if (INTEL_GEN(dev_priv) < 9) {
                enum i9xx_plane_id i9xx_plane = primary->i9xx_plane;

                BUG_ON(i9xx_plane >= ARRAY_SIZE(dev_priv->plane_to_crtc_mapping) ||
                       dev_priv->plane_to_crtc_mapping[i9xx_plane] != NULL);
                dev_priv->plane_to_crtc_mapping[i9xx_plane] = intel_crtc;
        }

        drm_crtc_helper_add(&intel_crtc->base, &intel_helper_funcs);

        intel_color_init(&intel_crtc->base);

        WARN_ON(drm_crtc_index(&intel_crtc->base) != intel_crtc->pipe);

        return 0;

fail:
        /*
         * drm_mode_config_cleanup() will free up any
         * crtcs/planes already initialized.
         */
        kfree(crtc_state);
        kfree(intel_crtc);

        return ret;
}

enum i915_pipe intel_get_pipe_from_connector(struct intel_connector *connector)
{
        struct drm_device *dev = connector->base.dev;

        WARN_ON(!drm_modeset_is_locked(&dev->mode_config.connection_mutex));

        if (!connector->base.state->crtc)
                return INVALID_PIPE;

        return to_intel_crtc(connector->base.state->crtc)->pipe;
}

int intel_get_pipe_from_crtc_id_ioctl(struct drm_device *dev, void *data,
                                      struct drm_file *file)
{
        struct drm_i915_get_pipe_from_crtc_id *pipe_from_crtc_id = data;
        struct drm_crtc *drmmode_crtc;
        struct intel_crtc *crtc;

        drmmode_crtc = drm_crtc_find(dev, file, pipe_from_crtc_id->crtc_id);
        if (!drmmode_crtc)
                return -ENOENT;

        crtc = to_intel_crtc(drmmode_crtc);
        pipe_from_crtc_id->pipe = crtc->pipe;

        return 0;
}

static int intel_encoder_clones(struct intel_encoder *encoder)
{
        struct drm_device *dev = encoder->base.dev;
        struct intel_encoder *source_encoder;
        int index_mask = 0;
        int entry = 0;

        for_each_intel_encoder(dev, source_encoder) {
                if (encoders_cloneable(encoder, source_encoder))
                        index_mask |= (1 << entry);

                entry++;
        }

        return index_mask;
}

static bool has_edp_a(struct drm_i915_private *dev_priv)
{
        if (!IS_MOBILE(dev_priv))
                return false;

        if ((I915_READ(DP_A) & DP_DETECTED) == 0)
                return false;

        if (IS_GEN5(dev_priv) && (I915_READ(FUSE_STRAP) & ILK_eDP_A_DISABLE))
                return false;

        return true;
}

static bool intel_crt_present(struct drm_i915_private *dev_priv)
{
        if (INTEL_GEN(dev_priv) >= 9)
                return false;

        if (IS_HSW_ULT(dev_priv) || IS_BDW_ULT(dev_priv))
                return false;

        if (IS_CHERRYVIEW(dev_priv))
                return false;

        if (HAS_PCH_LPT_H(dev_priv) &&
            I915_READ(SFUSE_STRAP) & SFUSE_STRAP_CRT_DISABLED)
                return false;

        /* DDI E can't be used if DDI A requires 4 lanes */
        if (HAS_DDI(dev_priv) && I915_READ(DDI_BUF_CTL(PORT_A)) & DDI_A_4_LANES)
                return false;

        if (!dev_priv->vbt.int_crt_support)
                return false;

        return true;
}

void intel_pps_unlock_regs_wa(struct drm_i915_private *dev_priv)
{
        int pps_num;
        int pps_idx;

        if (HAS_DDI(dev_priv))
                return;
        /*
         * This w/a is needed at least on CPT/PPT, but to be sure apply it
         * everywhere where registers can be write protected.
         */
        if (IS_VALLEYVIEW(dev_priv) || IS_CHERRYVIEW(dev_priv))
                pps_num = 2;
        else
                pps_num = 1;

        for (pps_idx = 0; pps_idx < pps_num; pps_idx++) {
                u32 val = I915_READ(PP_CONTROL(pps_idx));

                val = (val & ~PANEL_UNLOCK_MASK) | PANEL_UNLOCK_REGS;
                I915_WRITE(PP_CONTROL(pps_idx), val);
        }
}

static void intel_pps_init(struct drm_i915_private *dev_priv)
{
        if (HAS_PCH_SPLIT(dev_priv) || IS_GEN9_LP(dev_priv))
                dev_priv->pps_mmio_base = PCH_PPS_BASE;
        else if (IS_VALLEYVIEW(dev_priv) || IS_CHERRYVIEW(dev_priv))
                dev_priv->pps_mmio_base = VLV_PPS_BASE;
        else
                dev_priv->pps_mmio_base = PPS_BASE;

        intel_pps_unlock_regs_wa(dev_priv);
}

static void intel_setup_outputs(struct drm_i915_private *dev_priv)
{
        struct intel_encoder *encoder;
        bool dpd_is_edp = false;

        intel_pps_init(dev_priv);

        if (INTEL_INFO(dev_priv)->num_pipes == 0)
                return;

        /*
         * intel_edp_init_connector() depends on this completing first, to
         * prevent the registeration of both eDP and LVDS and the incorrect
         * sharing of the PPS.
         */
        intel_lvds_init(dev_priv);

        if (intel_crt_present(dev_priv))
                intel_crt_init(dev_priv);

        if (IS_ICELAKE(dev_priv)) {
                intel_ddi_init(dev_priv, PORT_A);
                intel_ddi_init(dev_priv, PORT_B);
                intel_ddi_init(dev_priv, PORT_C);
                intel_ddi_init(dev_priv, PORT_D);
                intel_ddi_init(dev_priv, PORT_E);
                intel_ddi_init(dev_priv, PORT_F);
        } else if (IS_GEN9_LP(dev_priv)) {
                /*
                 * FIXME: Broxton doesn't support port detection via the
                 * DDI_BUF_CTL_A or SFUSE_STRAP registers, find another way to
                 * detect the ports.
                 */
                intel_ddi_init(dev_priv, PORT_A);
                intel_ddi_init(dev_priv, PORT_B);
                intel_ddi_init(dev_priv, PORT_C);

                vlv_dsi_init(dev_priv);
        } else if (HAS_DDI(dev_priv)) {
                int found;

                /*
                 * Haswell uses DDI functions to detect digital outputs.
                 * On SKL pre-D0 the strap isn't connected, so we assume
                 * it's there.
                 */
                found = I915_READ(DDI_BUF_CTL(PORT_A)) & DDI_INIT_DISPLAY_DETECTED;
                /* WaIgnoreDDIAStrap: skl */
                if (found || IS_GEN9_BC(dev_priv))
                        intel_ddi_init(dev_priv, PORT_A);

                /* DDI B, C, D, and F detection is indicated by the SFUSE_STRAP
                 * register */
                found = I915_READ(SFUSE_STRAP);

                if (found & SFUSE_STRAP_DDIB_DETECTED)
                        intel_ddi_init(dev_priv, PORT_B);
                if (found & SFUSE_STRAP_DDIC_DETECTED)
                        intel_ddi_init(dev_priv, PORT_C);
                if (found & SFUSE_STRAP_DDID_DETECTED)
                        intel_ddi_init(dev_priv, PORT_D);
                if (found & SFUSE_STRAP_DDIF_DETECTED)
                        intel_ddi_init(dev_priv, PORT_F);
                /*
                 * On SKL we don't have a way to detect DDI-E so we rely on VBT.
                 */
                if (IS_GEN9_BC(dev_priv) &&
                    (dev_priv->vbt.ddi_port_info[PORT_E].supports_dp ||
                     dev_priv->vbt.ddi_port_info[PORT_E].supports_dvi ||
                     dev_priv->vbt.ddi_port_info[PORT_E].supports_hdmi))
                        intel_ddi_init(dev_priv, PORT_E);

        } else if (HAS_PCH_SPLIT(dev_priv)) {
                int found;
                dpd_is_edp = intel_dp_is_port_edp(dev_priv, PORT_D);

                if (has_edp_a(dev_priv))
                        intel_dp_init(dev_priv, DP_A, PORT_A);

                if (I915_READ(PCH_HDMIB) & SDVO_DETECTED) {
                        /* PCH SDVOB multiplex with HDMIB */
                        found = intel_sdvo_init(dev_priv, PCH_SDVOB, PORT_B);
                        if (!found)
                                intel_hdmi_init(dev_priv, PCH_HDMIB, PORT_B);
                        if (!found && (I915_READ(PCH_DP_B) & DP_DETECTED))
                                intel_dp_init(dev_priv, PCH_DP_B, PORT_B);
                }

                if (I915_READ(PCH_HDMIC) & SDVO_DETECTED)
                        intel_hdmi_init(dev_priv, PCH_HDMIC, PORT_C);

                if (!dpd_is_edp && I915_READ(PCH_HDMID) & SDVO_DETECTED)
                        intel_hdmi_init(dev_priv, PCH_HDMID, PORT_D);

                if (I915_READ(PCH_DP_C) & DP_DETECTED)
                        intel_dp_init(dev_priv, PCH_DP_C, PORT_C);

                if (I915_READ(PCH_DP_D) & DP_DETECTED)
                        intel_dp_init(dev_priv, PCH_DP_D, PORT_D);
        } else if (IS_VALLEYVIEW(dev_priv) || IS_CHERRYVIEW(dev_priv)) {
                bool has_edp, has_port;

                /*
                 * The DP_DETECTED bit is the latched state of the DDC
                 * SDA pin at boot. However since eDP doesn't require DDC
                 * (no way to plug in a DP->HDMI dongle) the DDC pins for
                 * eDP ports may have been muxed to an alternate function.
                 * Thus we can't rely on the DP_DETECTED bit alone to detect
                 * eDP ports. Consult the VBT as well as DP_DETECTED to
                 * detect eDP ports.
                 *
                 * Sadly the straps seem to be missing sometimes even for HDMI
                 * ports (eg. on Voyo V3 - CHT x7-Z8700), so check both strap
                 * and VBT for the presence of the port. Additionally we can't
                 * trust the port type the VBT declares as we've seen at least
                 * HDMI ports that the VBT claim are DP or eDP.
                 */
                has_edp = intel_dp_is_port_edp(dev_priv, PORT_B);
                has_port = intel_bios_is_port_present(dev_priv, PORT_B);
                if (I915_READ(VLV_DP_B) & DP_DETECTED || has_port)
                        has_edp &= intel_dp_init(dev_priv, VLV_DP_B, PORT_B);
                if ((I915_READ(VLV_HDMIB) & SDVO_DETECTED || has_port) && !has_edp)
                        intel_hdmi_init(dev_priv, VLV_HDMIB, PORT_B);

                has_edp = intel_dp_is_port_edp(dev_priv, PORT_C);
                has_port = intel_bios_is_port_present(dev_priv, PORT_C);
                if (I915_READ(VLV_DP_C) & DP_DETECTED || has_port)
                        has_edp &= intel_dp_init(dev_priv, VLV_DP_C, PORT_C);
                if ((I915_READ(VLV_HDMIC) & SDVO_DETECTED || has_port) && !has_edp)
                        intel_hdmi_init(dev_priv, VLV_HDMIC, PORT_C);

                if (IS_CHERRYVIEW(dev_priv)) {
                        /*
                         * eDP not supported on port D,
                         * so no need to worry about it
                         */
                        has_port = intel_bios_is_port_present(dev_priv, PORT_D);
                        if (I915_READ(CHV_DP_D) & DP_DETECTED || has_port)
                                intel_dp_init(dev_priv, CHV_DP_D, PORT_D);
                        if (I915_READ(CHV_HDMID) & SDVO_DETECTED || has_port)
                                intel_hdmi_init(dev_priv, CHV_HDMID, PORT_D);
                }

                vlv_dsi_init(dev_priv);
        } else if (!IS_GEN2(dev_priv) && !IS_PINEVIEW(dev_priv)) {
                bool found = false;

                if (I915_READ(GEN3_SDVOB) & SDVO_DETECTED) {
                        DRM_DEBUG_KMS("probing SDVOB\n");
                        found = intel_sdvo_init(dev_priv, GEN3_SDVOB, PORT_B);
                        if (!found && IS_G4X(dev_priv)) {
                                DRM_DEBUG_KMS("probing HDMI on SDVOB\n");
                                intel_hdmi_init(dev_priv, GEN4_HDMIB, PORT_B);
                        }

                        if (!found && IS_G4X(dev_priv))
                                intel_dp_init(dev_priv, DP_B, PORT_B);
                }

                /* Before G4X SDVOC doesn't have its own detect register */

                if (I915_READ(GEN3_SDVOB) & SDVO_DETECTED) {
                        DRM_DEBUG_KMS("probing SDVOC\n");
                        found = intel_sdvo_init(dev_priv, GEN3_SDVOC, PORT_C);
                }

                if (!found && (I915_READ(GEN3_SDVOC) & SDVO_DETECTED)) {

                        if (IS_G4X(dev_priv)) {
                                DRM_DEBUG_KMS("probing HDMI on SDVOC\n");
                                intel_hdmi_init(dev_priv, GEN4_HDMIC, PORT_C);
                        }
                        if (IS_G4X(dev_priv))
                                intel_dp_init(dev_priv, DP_C, PORT_C);
                }

                if (IS_G4X(dev_priv) && (I915_READ(DP_D) & DP_DETECTED))
                        intel_dp_init(dev_priv, DP_D, PORT_D);
        } else if (IS_GEN2(dev_priv))
                intel_dvo_init(dev_priv);

        if (SUPPORTS_TV(dev_priv))
                intel_tv_init(dev_priv);

        intel_psr_init(dev_priv);

        for_each_intel_encoder(&dev_priv->drm, encoder) {
                encoder->base.possible_crtcs = encoder->crtc_mask;
                encoder->base.possible_clones =
                        intel_encoder_clones(encoder);
        }

        intel_init_pch_refclk(dev_priv);

        drm_helper_move_panel_connectors_to_head(&dev_priv->drm);
}

static void intel_user_framebuffer_destroy(struct drm_framebuffer *fb)
{
        struct intel_framebuffer *intel_fb = to_intel_framebuffer(fb);
        struct drm_i915_gem_object *obj = intel_fb_obj(fb);

        drm_framebuffer_cleanup(fb);

        i915_gem_object_lock(obj);
        WARN_ON(!obj->framebuffer_references--);
        i915_gem_object_unlock(obj);

        i915_gem_object_put(obj);

        kfree(intel_fb);
}

static int intel_user_framebuffer_create_handle(struct drm_framebuffer *fb,
                                                struct drm_file *file,
                                                unsigned int *handle)
{
        struct drm_i915_gem_object *obj = intel_fb_obj(fb);

        if (obj->userptr.mm) {
                DRM_DEBUG("attempting to use a userptr for a framebuffer, denied\n");
                return -EINVAL;
        }

        return drm_gem_handle_create(file, &obj->base, handle);
}

static int intel_user_framebuffer_dirty(struct drm_framebuffer *fb,
                                        struct drm_file *file,
                                        unsigned flags, unsigned color,
                                        struct drm_clip_rect *clips,
                                        unsigned num_clips)
{
        struct drm_i915_gem_object *obj = intel_fb_obj(fb);

        i915_gem_object_flush_if_display(obj);
        intel_fb_obj_flush(obj, ORIGIN_DIRTYFB);

        return 0;
}

static const struct drm_framebuffer_funcs intel_fb_funcs = {
        .destroy = intel_user_framebuffer_destroy,
        .create_handle = intel_user_framebuffer_create_handle,
        .dirty = intel_user_framebuffer_dirty,
};

static
u32 intel_fb_pitch_limit(struct drm_i915_private *dev_priv,
                         uint64_t fb_modifier, uint32_t pixel_format)
{
        struct intel_crtc *crtc;
        struct intel_plane *plane;

        /*
         * We assume the primary plane for pipe A has
         * the highest stride limits of them all.
         */
        crtc = intel_get_crtc_for_pipe(dev_priv, PIPE_A);
        plane = to_intel_plane(crtc->base.primary);

        return plane->max_stride(plane, pixel_format, fb_modifier,
                                 DRM_MODE_ROTATE_0);
}

static int intel_framebuffer_init(struct intel_framebuffer *intel_fb,
                                  struct drm_i915_gem_object *obj,
                                  struct drm_mode_fb_cmd2 *mode_cmd)
{
        struct drm_i915_private *dev_priv = to_i915(obj->base.dev);
        struct drm_framebuffer *fb = &intel_fb->base;
        struct drm_format_name_buf format_name;
        u32 pitch_limit;
        unsigned int tiling, stride;
        int ret = -EINVAL;
        int i;

        i915_gem_object_lock(obj);
        obj->framebuffer_references++;
        tiling = i915_gem_object_get_tiling(obj);
        stride = i915_gem_object_get_stride(obj);
        i915_gem_object_unlock(obj);

        if (mode_cmd->flags & DRM_MODE_FB_MODIFIERS) {
                /*
                 * If there's a fence, enforce that
                 * the fb modifier and tiling mode match.
                 */
                if (tiling != I915_TILING_NONE &&
                    tiling != intel_fb_modifier_to_tiling(mode_cmd->modifier[0])) {
                        DRM_DEBUG_KMS("tiling_mode doesn't match fb modifier\n");
                        goto err;
                }
        } else {
                if (tiling == I915_TILING_X) {
                        mode_cmd->modifier[0] = I915_FORMAT_MOD_X_TILED;
                } else if (tiling == I915_TILING_Y) {
                        DRM_DEBUG_KMS("No Y tiling for legacy addfb\n");
                        goto err;
                }
        }

        /* Passed in modifier sanity checking. */
        switch (mode_cmd->modifier[0]) {
        case I915_FORMAT_MOD_Y_TILED_CCS:
        case I915_FORMAT_MOD_Yf_TILED_CCS:
                switch (mode_cmd->pixel_format) {
                case DRM_FORMAT_XBGR8888:
                case DRM_FORMAT_ABGR8888:
                case DRM_FORMAT_XRGB8888:
                case DRM_FORMAT_ARGB8888:
                        break;
                default:
                        DRM_DEBUG_KMS("RC supported only with RGB8888 formats\n");
                        goto err;
                }
                /* fall through */
        case I915_FORMAT_MOD_Y_TILED:
        case I915_FORMAT_MOD_Yf_TILED:
                if (INTEL_GEN(dev_priv) < 9) {
                        DRM_DEBUG_KMS("Unsupported tiling 0x%llx!\n",
                                      mode_cmd->modifier[0]);
                        goto err;
                }
        case DRM_FORMAT_MOD_LINEAR:
        case I915_FORMAT_MOD_X_TILED:
                break;
        default:
                DRM_DEBUG_KMS("Unsupported fb modifier 0x%llx!\n",
                              mode_cmd->modifier[0]);
                goto err;
        }

        /*
         * gen2/3 display engine uses the fence if present,
         * so the tiling mode must match the fb modifier exactly.
         */
        if (INTEL_GEN(dev_priv) < 4 &&
            tiling != intel_fb_modifier_to_tiling(mode_cmd->modifier[0])) {
                DRM_DEBUG_KMS("tiling_mode must match fb modifier exactly on gen2/3\n");
                goto err;
        }

        pitch_limit = intel_fb_pitch_limit(dev_priv, mode_cmd->modifier[0],
                                           mode_cmd->pixel_format);
        if (mode_cmd->pitches[0] > pitch_limit) {
                DRM_DEBUG_KMS("%s pitch (%u) must be at most %d\n",
                              mode_cmd->modifier[0] != DRM_FORMAT_MOD_LINEAR ?
                              "tiled" : "linear",
                              mode_cmd->pitches[0], pitch_limit);
                goto err;
        }

        /*
         * If there's a fence, enforce that
         * the fb pitch and fence stride match.
         */
        if (tiling != I915_TILING_NONE && mode_cmd->pitches[0] != stride) {
                DRM_DEBUG_KMS("pitch (%d) must match tiling stride (%d)\n",
                              mode_cmd->pitches[0], stride);
                goto err;
        }

        /* Reject formats not supported by any plane early. */
        switch (mode_cmd->pixel_format) {
        case DRM_FORMAT_C8:
        case DRM_FORMAT_RGB565:
        case DRM_FORMAT_XRGB8888:
        case DRM_FORMAT_ARGB8888:
                break;
        case DRM_FORMAT_XRGB1555:
                if (INTEL_GEN(dev_priv) > 3) {
                        DRM_DEBUG_KMS("unsupported pixel format: %s\n",
                                      drm_get_format_name(mode_cmd->pixel_format, &format_name));
                        goto err;
                }
                break;
        case DRM_FORMAT_ABGR8888:
                if (!IS_VALLEYVIEW(dev_priv) && !IS_CHERRYVIEW(dev_priv) &&
                    INTEL_GEN(dev_priv) < 9) {
                        DRM_DEBUG_KMS("unsupported pixel format: %s\n",
                                      drm_get_format_name(mode_cmd->pixel_format, &format_name));
                        goto err;
                }
                break;
        case DRM_FORMAT_XBGR8888:
        case DRM_FORMAT_XRGB2101010:
        case DRM_FORMAT_XBGR2101010:
                if (INTEL_GEN(dev_priv) < 4) {
                        DRM_DEBUG_KMS("unsupported pixel format: %s\n",
                                      drm_get_format_name(mode_cmd->pixel_format, &format_name));
                        goto err;
                }
                break;
        case DRM_FORMAT_ABGR2101010:
                if (!IS_VALLEYVIEW(dev_priv) && !IS_CHERRYVIEW(dev_priv)) {
                        DRM_DEBUG_KMS("unsupported pixel format: %s\n",
                                      drm_get_format_name(mode_cmd->pixel_format, &format_name));
                        goto err;
                }
                break;
        case DRM_FORMAT_YUYV:
        case DRM_FORMAT_UYVY:
        case DRM_FORMAT_YVYU:
        case DRM_FORMAT_VYUY:
                if (INTEL_GEN(dev_priv) < 5 && !IS_G4X(dev_priv)) {
                        DRM_DEBUG_KMS("unsupported pixel format: %s\n",
                                      drm_get_format_name(mode_cmd->pixel_format, &format_name));
                        goto err;
                }
                break;
        case DRM_FORMAT_NV12:
                if (INTEL_GEN(dev_priv) < 9 || IS_SKYLAKE(dev_priv) ||
                    IS_BROXTON(dev_priv) || INTEL_GEN(dev_priv) >= 11) {
                        DRM_DEBUG_KMS("unsupported pixel format: %s\n",
                                      drm_get_format_name(mode_cmd->pixel_format,
                                                          &format_name));
                        goto err;
                }
                break;
        default:
                DRM_DEBUG_KMS("unsupported pixel format: %s\n",
                              drm_get_format_name(mode_cmd->pixel_format, &format_name));
                goto err;
        }

        /* FIXME need to adjust LINOFF/TILEOFF accordingly. */
        if (mode_cmd->offsets[0] != 0)
                goto err;

        drm_helper_mode_fill_fb_struct(&dev_priv->drm, fb, mode_cmd);

        if (fb->format->format == DRM_FORMAT_NV12 &&
            (fb->width < SKL_MIN_YUV_420_SRC_W ||
             fb->height < SKL_MIN_YUV_420_SRC_H ||
             (fb->width % 4) != 0 || (fb->height % 4) != 0)) {
                DRM_DEBUG_KMS("src dimensions not correct for NV12\n");
                goto err;
        }

        for (i = 0; i < fb->format->num_planes; i++) {
                u32 stride_alignment;

                if (mode_cmd->handles[i] != mode_cmd->handles[0]) {
                        DRM_DEBUG_KMS("bad plane %d handle\n", i);
                        goto err;
                }

                stride_alignment = intel_fb_stride_alignment(fb, i);

                /*
                 * Display WA #0531: skl,bxt,kbl,glk
                 *
                 * Render decompression and plane width > 3840
                 * combined with horizontal panning requires the
                 * plane stride to be a multiple of 4. We'll just
                 * require the entire fb to accommodate that to avoid
                 * potential runtime errors at plane configuration time.
                 */
                if (IS_GEN9(dev_priv) && i == 0 && fb->width > 3840 &&
                    is_ccs_modifier(fb->modifier))
                        stride_alignment *= 4;

                if (fb->pitches[i] & (stride_alignment - 1)) {
                        DRM_DEBUG_KMS("plane %d pitch (%d) must be at least %u byte aligned\n",
                                      i, fb->pitches[i], stride_alignment);
                        goto err;
                }

                fb->obj[i] = &obj->base;
        }

        ret = intel_fill_fb_info(dev_priv, fb);
        if (ret)
                goto err;

        ret = drm_framebuffer_init(&dev_priv->drm, fb, &intel_fb_funcs);
        if (ret) {
                DRM_ERROR("framebuffer init failed %d\n", ret);
                goto err;
        }

        return 0;

err:
        i915_gem_object_lock(obj);
        obj->framebuffer_references--;
        i915_gem_object_unlock(obj);
        return ret;
}

static struct drm_framebuffer *
intel_user_framebuffer_create(struct drm_device *dev,
                              struct drm_file *filp,
                              const struct drm_mode_fb_cmd2 *user_mode_cmd)
{
        struct drm_framebuffer *fb;
        struct drm_i915_gem_object *obj;
        struct drm_mode_fb_cmd2 mode_cmd = *user_mode_cmd;

        obj = i915_gem_object_lookup(filp, mode_cmd.handles[0]);
        if (!obj)
                return ERR_PTR(-ENOENT);
        DRM_DEBUG("obj=%p\n", obj);

        fb = intel_framebuffer_create(obj, &mode_cmd);
        if (IS_ERR(fb))
                i915_gem_object_put(obj);

        return fb;
}

static void intel_atomic_state_free(struct drm_atomic_state *state)
{
        struct intel_atomic_state *intel_state = to_intel_atomic_state(state);

        drm_atomic_state_default_release(state);

        i915_sw_fence_fini(&intel_state->commit_ready);

        kfree(state);
}

static enum drm_mode_status
intel_mode_valid(struct drm_device *dev,
                 const struct drm_display_mode *mode)
{
        struct drm_i915_private *dev_priv = to_i915(dev);
        int hdisplay_max, htotal_max;
        int vdisplay_max, vtotal_max;

        /*
         * Can't reject DBLSCAN here because Xorg ddxen can add piles
         * of DBLSCAN modes to the output's mode list when they detect
         * the scaling mode property on the connector. And they don't
         * ask the kernel to validate those modes in any way until
         * modeset time at which point the client gets a protocol error.
         * So in order to not upset those clients we silently ignore the
         * DBLSCAN flag on such connectors. For other connectors we will
         * reject modes with the DBLSCAN flag in encoder->compute_config().
         * And we always reject DBLSCAN modes in connector->mode_valid()
         * as we never want such modes on the connector's mode list.
         */

        if (mode->vscan > 1)
                return MODE_NO_VSCAN;

        if (mode->flags & DRM_MODE_FLAG_HSKEW)
                return MODE_H_ILLEGAL;

        if (mode->flags & (DRM_MODE_FLAG_CSYNC |
                           DRM_MODE_FLAG_NCSYNC |
                           DRM_MODE_FLAG_PCSYNC))
                return MODE_HSYNC;

        if (mode->flags & (DRM_MODE_FLAG_BCAST |
                           DRM_MODE_FLAG_PIXMUX |
                           DRM_MODE_FLAG_CLKDIV2))
                return MODE_BAD;

        if (INTEL_GEN(dev_priv) >= 9 ||
            IS_BROADWELL(dev_priv) || IS_HASWELL(dev_priv)) {
                hdisplay_max = 8192; /* FDI max 4096 handled elsewhere */
                vdisplay_max = 4096;
                htotal_max = 8192;
                vtotal_max = 8192;
        } else if (INTEL_GEN(dev_priv) >= 3) {
                hdisplay_max = 4096;
                vdisplay_max = 4096;
                htotal_max = 8192;
                vtotal_max = 8192;
        } else {
                hdisplay_max = 2048;
                vdisplay_max = 2048;
                htotal_max = 4096;
                vtotal_max = 4096;
        }

        if (mode->hdisplay > hdisplay_max ||
            mode->hsync_start > htotal_max ||
            mode->hsync_end > htotal_max ||
            mode->htotal > htotal_max)
                return MODE_H_ILLEGAL;

        if (mode->vdisplay > vdisplay_max ||
            mode->vsync_start > vtotal_max ||
            mode->vsync_end > vtotal_max ||
            mode->vtotal > vtotal_max)
                return MODE_V_ILLEGAL;

        return MODE_OK;
}

static const struct drm_mode_config_funcs intel_mode_funcs = {
        .fb_create = intel_user_framebuffer_create,
        .get_format_info = intel_get_format_info,
        .output_poll_changed = intel_fbdev_output_poll_changed,
        .mode_valid = intel_mode_valid,
        .atomic_check = intel_atomic_check,
        .atomic_commit = intel_atomic_commit,
        .atomic_state_alloc = intel_atomic_state_alloc,
        .atomic_state_clear = intel_atomic_state_clear,
        .atomic_state_free = intel_atomic_state_free,
};

/**
 * intel_init_display_hooks - initialize the display modesetting hooks
 * @dev_priv: device private
 */
void intel_init_display_hooks(struct drm_i915_private *dev_priv)
{
        intel_init_cdclk_hooks(dev_priv);

        if (INTEL_GEN(dev_priv) >= 9) {
                dev_priv->display.get_pipe_config = haswell_get_pipe_config;
                dev_priv->display.get_initial_plane_config =
                        skylake_get_initial_plane_config;
                dev_priv->display.crtc_compute_clock =
                        haswell_crtc_compute_clock;
                dev_priv->display.crtc_enable = haswell_crtc_enable;
                dev_priv->display.crtc_disable = haswell_crtc_disable;
        } else if (HAS_DDI(dev_priv)) {
                dev_priv->display.get_pipe_config = haswell_get_pipe_config;
                dev_priv->display.get_initial_plane_config =
                        i9xx_get_initial_plane_config;
                dev_priv->display.crtc_compute_clock =
                        haswell_crtc_compute_clock;
                dev_priv->display.crtc_enable = haswell_crtc_enable;
                dev_priv->display.crtc_disable = haswell_crtc_disable;
        } else if (HAS_PCH_SPLIT(dev_priv)) {
                dev_priv->display.get_pipe_config = ironlake_get_pipe_config;
                dev_priv->display.get_initial_plane_config =
                        i9xx_get_initial_plane_config;
                dev_priv->display.crtc_compute_clock =
                        ironlake_crtc_compute_clock;
                dev_priv->display.crtc_enable = ironlake_crtc_enable;
                dev_priv->display.crtc_disable = ironlake_crtc_disable;
        } else if (IS_CHERRYVIEW(dev_priv)) {
                dev_priv->display.get_pipe_config = i9xx_get_pipe_config;
                dev_priv->display.get_initial_plane_config =
                        i9xx_get_initial_plane_config;
                dev_priv->display.crtc_compute_clock = chv_crtc_compute_clock;
                dev_priv->display.crtc_enable = valleyview_crtc_enable;
                dev_priv->display.crtc_disable = i9xx_crtc_disable;
        } else if (IS_VALLEYVIEW(dev_priv)) {
                dev_priv->display.get_pipe_config = i9xx_get_pipe_config;
                dev_priv->display.get_initial_plane_config =
                        i9xx_get_initial_plane_config;
                dev_priv->display.crtc_compute_clock = vlv_crtc_compute_clock;
                dev_priv->display.crtc_enable = valleyview_crtc_enable;
                dev_priv->display.crtc_disable = i9xx_crtc_disable;
        } else if (IS_G4X(dev_priv)) {
                dev_priv->display.get_pipe_config = i9xx_get_pipe_config;
                dev_priv->display.get_initial_plane_config =
                        i9xx_get_initial_plane_config;
                dev_priv->display.crtc_compute_clock = g4x_crtc_compute_clock;
                dev_priv->display.crtc_enable = i9xx_crtc_enable;
                dev_priv->display.crtc_disable = i9xx_crtc_disable;
        } else if (IS_PINEVIEW(dev_priv)) {
                dev_priv->display.get_pipe_config = i9xx_get_pipe_config;
                dev_priv->display.get_initial_plane_config =
                        i9xx_get_initial_plane_config;
                dev_priv->display.crtc_compute_clock = pnv_crtc_compute_clock;
                dev_priv->display.crtc_enable = i9xx_crtc_enable;
                dev_priv->display.crtc_disable = i9xx_crtc_disable;
        } else if (!IS_GEN2(dev_priv)) {
                dev_priv->display.get_pipe_config = i9xx_get_pipe_config;
                dev_priv->display.get_initial_plane_config =
                        i9xx_get_initial_plane_config;
                dev_priv->display.crtc_compute_clock = i9xx_crtc_compute_clock;
                dev_priv->display.crtc_enable = i9xx_crtc_enable;
                dev_priv->display.crtc_disable = i9xx_crtc_disable;
        } else {
                dev_priv->display.get_pipe_config = i9xx_get_pipe_config;
                dev_priv->display.get_initial_plane_config =
                        i9xx_get_initial_plane_config;
                dev_priv->display.crtc_compute_clock = i8xx_crtc_compute_clock;
                dev_priv->display.crtc_enable = i9xx_crtc_enable;
                dev_priv->display.crtc_disable = i9xx_crtc_disable;
        }

        if (IS_GEN5(dev_priv)) {
                dev_priv->display.fdi_link_train = ironlake_fdi_link_train;
        } else if (IS_GEN6(dev_priv)) {
                dev_priv->display.fdi_link_train = gen6_fdi_link_train;
        } else if (IS_IVYBRIDGE(dev_priv)) {
                /* FIXME: detect B0+ stepping and use auto training */
                dev_priv->display.fdi_link_train = ivb_manual_fdi_link_train;
        } else if (IS_HASWELL(dev_priv) || IS_BROADWELL(dev_priv)) {
                dev_priv->display.fdi_link_train = hsw_fdi_link_train;
        }

        if (INTEL_GEN(dev_priv) >= 9)
                dev_priv->display.update_crtcs = skl_update_crtcs;
        else
                dev_priv->display.update_crtcs = intel_update_crtcs;
}

/*
 * Some machines (Lenovo U160) do not work with SSC on LVDS for some reason
 */
static void quirk_ssc_force_disable(struct drm_device *dev)
{
        struct drm_i915_private *dev_priv = to_i915(dev);
        dev_priv->quirks |= QUIRK_LVDS_SSC_DISABLE;
        DRM_INFO("applying lvds SSC disable quirk\n");
}

/*
 * A machine (e.g. Acer Aspire 5734Z) may need to invert the panel backlight
 * brightness value
 */
static void quirk_invert_brightness(struct drm_device *dev)
{
        struct drm_i915_private *dev_priv = to_i915(dev);
        dev_priv->quirks |= QUIRK_INVERT_BRIGHTNESS;
        DRM_INFO("applying inverted panel brightness quirk\n");
}

/* Some VBT's incorrectly indicate no backlight is present */
static void quirk_backlight_present(struct drm_device *dev)
{
        struct drm_i915_private *dev_priv = to_i915(dev);
        dev_priv->quirks |= QUIRK_BACKLIGHT_PRESENT;
        DRM_INFO("applying backlight present quirk\n");
}

/* Toshiba Satellite P50-C-18C requires T12 delay to be min 800ms
 * which is 300 ms greater than eDP spec T12 min.
 */
static void quirk_increase_t12_delay(struct drm_device *dev)
{
        struct drm_i915_private *dev_priv = to_i915(dev);

        dev_priv->quirks |= QUIRK_INCREASE_T12_DELAY;
        DRM_INFO("Applying T12 delay quirk\n");
}

/*
 * GeminiLake NUC HDMI outputs require additional off time
 * this allows the onboard retimer to correctly sync to signal
 */
static void quirk_increase_ddi_disabled_time(struct drm_device *dev)
{
        struct drm_i915_private *dev_priv = to_i915(dev);

        dev_priv->quirks |= QUIRK_INCREASE_DDI_DISABLED_TIME;
        DRM_INFO("Applying Increase DDI Disabled quirk\n");
}

struct intel_quirk {
        int device;
        int subsystem_vendor;
        int subsystem_device;
        void (*hook)(struct drm_device *dev);
};

/* For systems that don't have a meaningful PCI subdevice/subvendor ID */
struct intel_dmi_quirk {
        void (*hook)(struct drm_device *dev);
        const struct dmi_system_id (*dmi_id_list)[];
};

static int intel_dmi_reverse_brightness(const struct dmi_system_id *id)
{
        DRM_INFO("Backlight polarity reversed on %s\n", id->ident);
        return 1;
}

static const struct intel_dmi_quirk intel_dmi_quirks[] = {
        {
                .dmi_id_list = &(const struct dmi_system_id[]) {
                        {
                                .callback = intel_dmi_reverse_brightness,
                                .ident = "NCR Corporation",
                                .matches = {DMI_MATCH(DMI_SYS_VENDOR, "NCR Corporation"),
                                            DMI_MATCH(DMI_PRODUCT_NAME, ""),
                                },
                        },
                        { }  /* terminating entry */
                },
                .hook = quirk_invert_brightness,
        },
};

static struct intel_quirk intel_quirks[] = {
        /* Lenovo U160 cannot use SSC on LVDS */
        { 0x0046, 0x17aa, 0x3920, quirk_ssc_force_disable },

        /* Sony Vaio Y cannot use SSC on LVDS */
        { 0x0046, 0x104d, 0x9076, quirk_ssc_force_disable },

        /* Acer Aspire 5734Z must invert backlight brightness */
        { 0x2a42, 0x1025, 0x0459, quirk_invert_brightness },

        /* Acer/eMachines G725 */
        { 0x2a42, 0x1025, 0x0210, quirk_invert_brightness },

        /* Acer/eMachines e725 */
        { 0x2a42, 0x1025, 0x0212, quirk_invert_brightness },

        /* Acer/Packard Bell NCL20 */
        { 0x2a42, 0x1025, 0x034b, quirk_invert_brightness },

        /* Acer Aspire 4736Z */
        { 0x2a42, 0x1025, 0x0260, quirk_invert_brightness },

        /* Acer Aspire 5336 */
        { 0x2a42, 0x1025, 0x048a, quirk_invert_brightness },

        /* Acer C720 and C720P Chromebooks (Celeron 2955U) have backlights */
        { 0x0a06, 0x1025, 0x0a11, quirk_backlight_present },

        /* Acer C720 Chromebook (Core i3 4005U) */
        { 0x0a16, 0x1025, 0x0a11, quirk_backlight_present },

        /* Apple Macbook 2,1 (Core 2 T7400) */
        { 0x27a2, 0x8086, 0x7270, quirk_backlight_present },

        /* Apple Macbook 4,1 */
        { 0x2a02, 0x106b, 0x00a1, quirk_backlight_present },

        /* Toshiba CB35 Chromebook (Celeron 2955U) */
        { 0x0a06, 0x1179, 0x0a88, quirk_backlight_present },

        /* HP Chromebook 14 (Celeron 2955U) */
        { 0x0a06, 0x103c, 0x21ed, quirk_backlight_present },

        /* Dell Chromebook 11 */
        { 0x0a06, 0x1028, 0x0a35, quirk_backlight_present },

        /* Dell Chromebook 11 (2015 version) */
        { 0x0a16, 0x1028, 0x0a35, quirk_backlight_present },

        /* Toshiba Satellite P50-C-18C */
        { 0x191B, 0x1179, 0xF840, quirk_increase_t12_delay },

        /* GeminiLake NUC */
        { 0x3185, 0x8086, 0x2072, quirk_increase_ddi_disabled_time },
        { 0x3184, 0x8086, 0x2072, quirk_increase_ddi_disabled_time },
        /* ASRock ITX*/
        { 0x3185, 0x1849, 0x2212, quirk_increase_ddi_disabled_time },
        { 0x3184, 0x1849, 0x2212, quirk_increase_ddi_disabled_time },
};

static void intel_init_quirks(struct drm_device *dev)
{
        struct pci_dev *d = dev->pdev;
        int i;

        for (i = 0; i < ARRAY_SIZE(intel_quirks); i++) {
                struct intel_quirk *q = &intel_quirks[i];

                if (d->device == q->device &&
                    (d->subsystem_vendor == q->subsystem_vendor ||
                     q->subsystem_vendor == PCI_ANY_ID) &&
                    (d->subsystem_device == q->subsystem_device ||
                     q->subsystem_device == PCI_ANY_ID))
                        q->hook(dev);
        }
        for (i = 0; i < ARRAY_SIZE(intel_dmi_quirks); i++) {
                if (dmi_check_system(*intel_dmi_quirks[i].dmi_id_list) != 0)
                        intel_dmi_quirks[i].hook(dev);
        }
}

/* Disable the VGA plane that we never use */
static void i915_disable_vga(struct drm_i915_private *dev_priv)
{
        struct pci_dev *pdev = dev_priv->drm.pdev;
        u8 sr1;
        i915_reg_t vga_reg = i915_vgacntrl_reg(dev_priv);

        /* WaEnableVGAAccessThroughIOPort:ctg,elk,ilk,snb,ivb,vlv,hsw */
        vga_get_uninterruptible(pdev, VGA_RSRC_LEGACY_IO);
        outb(SR01, VGA_SR_INDEX);
        sr1 = inb(VGA_SR_DATA);
        outb(sr1 | 1<<5, VGA_SR_DATA);
        vga_put(pdev, VGA_RSRC_LEGACY_IO);
        udelay(300);

        I915_WRITE(vga_reg, VGA_DISP_DISABLE);
        POSTING_READ(vga_reg);
}

void intel_modeset_init_hw(struct drm_device *dev)
{
        struct drm_i915_private *dev_priv = to_i915(dev);

        intel_update_cdclk(dev_priv);
        intel_dump_cdclk_state(&dev_priv->cdclk.hw, "Current CDCLK");
        dev_priv->cdclk.logical = dev_priv->cdclk.actual = dev_priv->cdclk.hw;
}

/*
 * Calculate what we think the watermarks should be for the state we've read
 * out of the hardware and then immediately program those watermarks so that
 * we ensure the hardware settings match our internal state.
 *
 * We can calculate what we think WM's should be by creating a duplicate of the
 * current state (which was constructed during hardware readout) and running it
 * through the atomic check code to calculate new watermark values in the
 * state object.
 */
static void sanitize_watermarks(struct drm_device *dev)
{
        struct drm_i915_private *dev_priv = to_i915(dev);
        struct drm_atomic_state *state;
        struct intel_atomic_state *intel_state;
        struct drm_crtc *crtc;
        struct drm_crtc_state *cstate;
        struct drm_modeset_acquire_ctx ctx;
        int ret;
        int i;

        /* Only supported on platforms that use atomic watermark design */
        if (!dev_priv->display.optimize_watermarks)
                return;

        /*
         * We need to hold connection_mutex before calling duplicate_state so
         * that the connector loop is protected.
         */
        drm_modeset_acquire_init(&ctx, 0);
retry:
        ret = drm_modeset_lock_all_ctx(dev, &ctx);
        if (ret == -EDEADLK) {
                drm_modeset_backoff(&ctx);
                goto retry;
        } else if (WARN_ON(ret)) {
                goto fail;
        }

        state = drm_atomic_helper_duplicate_state(dev, &ctx);
        if (WARN_ON(IS_ERR(state)))
                goto fail;

        intel_state = to_intel_atomic_state(state);

        /*
         * Hardware readout is the only time we don't want to calculate
         * intermediate watermarks (since we don't trust the current
         * watermarks).
         */
        if (!HAS_GMCH_DISPLAY(dev_priv))
                intel_state->skip_intermediate_wm = true;

        ret = intel_atomic_check(dev, state);
        if (ret) {
                /*
                 * If we fail here, it means that the hardware appears to be
                 * programmed in a way that shouldn't be possible, given our
                 * understanding of watermark requirements.  This might mean a
                 * mistake in the hardware readout code or a mistake in the
                 * watermark calculations for a given platform.  Raise a WARN
                 * so that this is noticeable.
                 *
                 * If this actually happens, we'll have to just leave the
                 * BIOS-programmed watermarks untouched and hope for the best.
                 */
                WARN(true, "Could not determine valid watermarks for inherited state\n");
                goto put_state;
        }

        /* Write calculated watermark values back */
        for_each_new_crtc_in_state(state, crtc, cstate, i) {
                struct intel_crtc_state *cs = to_intel_crtc_state(cstate);

                cs->wm.need_postvbl_update = true;
                dev_priv->display.optimize_watermarks(intel_state, cs);

                to_intel_crtc_state(crtc->state)->wm = cs->wm;
        }

put_state:
        drm_atomic_state_put(state);
fail:
        drm_modeset_drop_locks(&ctx);
        drm_modeset_acquire_fini(&ctx);
}

static void intel_update_fdi_pll_freq(struct drm_i915_private *dev_priv)
{
        if (IS_GEN5(dev_priv)) {
                u32 fdi_pll_clk =
                        I915_READ(FDI_PLL_BIOS_0) & FDI_PLL_FB_CLOCK_MASK;

                dev_priv->fdi_pll_freq = (fdi_pll_clk + 2) * 10000;
        } else if (IS_GEN6(dev_priv) || IS_IVYBRIDGE(dev_priv)) {
                dev_priv->fdi_pll_freq = 270000;
        } else {
                return;
        }

        DRM_DEBUG_DRIVER("FDI PLL freq=%d\n", dev_priv->fdi_pll_freq);
}

static int intel_initial_commit(struct drm_device *dev)
{
        struct drm_atomic_state *state = NULL;
        struct drm_modeset_acquire_ctx ctx;
        struct drm_crtc *crtc;
        struct drm_crtc_state *crtc_state;
        int ret = 0;

        state = drm_atomic_state_alloc(dev);
        if (!state)
                return -ENOMEM;

        drm_modeset_acquire_init(&ctx, 0);

retry:
        state->acquire_ctx = &ctx;

        drm_for_each_crtc(crtc, dev) {
                crtc_state = drm_atomic_get_crtc_state(state, crtc);
                if (IS_ERR(crtc_state)) {
                        ret = PTR_ERR(crtc_state);
                        goto out;
                }

                if (crtc_state->active) {
                        ret = drm_atomic_add_affected_planes(state, crtc);
                        if (ret)
                                goto out;

                        /*
                         * FIXME hack to force a LUT update to avoid the
                         * plane update forcing the pipe gamma on without
                         * having a proper LUT loaded. Remove once we
                         * have readout for pipe gamma enable.
                         */
                        crtc_state->color_mgmt_changed = true;
                }
        }

        ret = drm_atomic_commit(state);

out:
        if (ret == -EDEADLK) {
                drm_atomic_state_clear(state);
                drm_modeset_backoff(&ctx);
                goto retry;
        }

        drm_atomic_state_put(state);

        drm_modeset_drop_locks(&ctx);
        drm_modeset_acquire_fini(&ctx);

        return ret;
}

int intel_modeset_init(struct drm_device *dev)
{
        struct drm_i915_private *dev_priv = to_i915(dev);
        struct i915_ggtt *ggtt = &dev_priv->ggtt;
        enum i915_pipe pipe;
        struct intel_crtc *crtc;
        int ret;

        dev_priv->modeset_wq = alloc_ordered_workqueue("i915_modeset", 0);

        drm_mode_config_init(dev);

        dev->mode_config.min_width = 0;
        dev->mode_config.min_height = 0;

        dev->mode_config.preferred_depth = 24;
        dev->mode_config.prefer_shadow = 1;

        dev->mode_config.allow_fb_modifiers = true;

        dev->mode_config.funcs = &intel_mode_funcs;

        init_llist_head(&dev_priv->atomic_helper.free_list);
        INIT_WORK(&dev_priv->atomic_helper.free_work,
                  intel_atomic_helper_free_state_worker);

        intel_init_quirks(dev);

        intel_init_pm(dev_priv);

        /*
         * There may be no VBT; and if the BIOS enabled SSC we can
         * just keep using it to avoid unnecessary flicker.  Whereas if the
         * BIOS isn't using it, don't assume it will work even if the VBT
         * indicates as much.
         */
        if (HAS_PCH_IBX(dev_priv) || HAS_PCH_CPT(dev_priv)) {
                bool bios_lvds_use_ssc = !!(I915_READ(PCH_DREF_CONTROL) &
                                            DREF_SSC1_ENABLE);

                if (dev_priv->vbt.lvds_use_ssc != bios_lvds_use_ssc) {
                        DRM_DEBUG_KMS("SSC %sabled by BIOS, overriding VBT which says %sabled\n",
                                     bios_lvds_use_ssc ? "en" : "dis",
                                     dev_priv->vbt.lvds_use_ssc ? "en" : "dis");
                        dev_priv->vbt.lvds_use_ssc = bios_lvds_use_ssc;
                }
        }

        /* maximum framebuffer dimensions */
        if (IS_GEN2(dev_priv)) {
                dev->mode_config.max_width = 2048;
                dev->mode_config.max_height = 2048;
        } else if (IS_GEN3(dev_priv)) {
                dev->mode_config.max_width = 4096;
                dev->mode_config.max_height = 4096;
        } else {
                dev->mode_config.max_width = 8192;
                dev->mode_config.max_height = 8192;
        }

        if (IS_I845G(dev_priv) || IS_I865G(dev_priv)) {
                dev->mode_config.cursor_width = IS_I845G(dev_priv) ? 64 : 512;
                dev->mode_config.cursor_height = 1023;
        } else if (IS_GEN2(dev_priv)) {
                dev->mode_config.cursor_width = 64;
                dev->mode_config.cursor_height = 64;
        } else {
                dev->mode_config.cursor_width = 256;
                dev->mode_config.cursor_height = 256;
        }

        dev->mode_config.fb_base = ggtt->gmadr.start;

        DRM_DEBUG_KMS("%d display pipe%s available.\n",
                      INTEL_INFO(dev_priv)->num_pipes,
                      INTEL_INFO(dev_priv)->num_pipes > 1 ? "s" : "");

        for_each_pipe(dev_priv, pipe) {
                ret = intel_crtc_init(dev_priv, pipe);
                if (ret) {
                        drm_mode_config_cleanup(dev);
                        return ret;
                }
        }

        intel_shared_dpll_init(dev);
        intel_update_fdi_pll_freq(dev_priv);

        intel_update_czclk(dev_priv);
        intel_modeset_init_hw(dev);

        if (dev_priv->max_cdclk_freq == 0)
                intel_update_max_cdclk(dev_priv);

        /* Just disable it once at startup */
        i915_disable_vga(dev_priv);
        intel_setup_outputs(dev_priv);

        drm_modeset_lock_all(dev);
        intel_modeset_setup_hw_state(dev, dev->mode_config.acquire_ctx);
        drm_modeset_unlock_all(dev);

        for_each_intel_crtc(dev, crtc) {
                struct intel_initial_plane_config plane_config = {};

                if (!crtc->active)
                        continue;

                /*
                 * Note that reserving the BIOS fb up front prevents us
                 * from stuffing other stolen allocations like the ring
                 * on top.  This prevents some ugliness at boot time, and
                 * can even allow for smooth boot transitions if the BIOS
                 * fb is large enough for the active pipe configuration.
                 */
                dev_priv->display.get_initial_plane_config(crtc,
                                                           &plane_config);

                /*
                 * If the fb is shared between multiple heads, we'll
                 * just get the first one.
                 */
                intel_find_initial_plane_obj(crtc, &plane_config);
        }

        /*
         * Make sure hardware watermarks really match the state we read out.
         * Note that we need to do this after reconstructing the BIOS fb's
         * since the watermark calculation done here will use pstate->fb.
         */
        if (!HAS_GMCH_DISPLAY(dev_priv))
                sanitize_watermarks(dev);

        /*
         * Force all active planes to recompute their states. So that on
         * mode_setcrtc after probe, all the intel_plane_state variables
         * are already calculated and there is no assert_plane warnings
         * during bootup.
         */
        ret = intel_initial_commit(dev);
        if (ret)
                DRM_DEBUG_KMS("Initial commit in probe failed.\n");

        return 0;
}

void i830_enable_pipe(struct drm_i915_private *dev_priv, enum i915_pipe pipe)
{
        struct intel_crtc *crtc = intel_get_crtc_for_pipe(dev_priv, pipe);
        /* 640x480@60Hz, ~25175 kHz */
        struct dpll clock = {
                .m1 = 18,
                .m2 = 7,
                .p1 = 13,
                .p2 = 4,
                .n = 2,
        };
        u32 dpll, fp;
        int i;

        WARN_ON(i9xx_calc_dpll_params(48000, &clock) != 25154);

        DRM_DEBUG_KMS("enabling pipe %c due to force quirk (vco=%d dot=%d)\n",
                      pipe_name(pipe), clock.vco, clock.dot);

        fp = i9xx_dpll_compute_fp(&clock);
        dpll = (I915_READ(DPLL(pipe)) & DPLL_DVO_2X_MODE) |
                DPLL_VGA_MODE_DIS |
                ((clock.p1 - 2) << DPLL_FPA01_P1_POST_DIV_SHIFT) |
                PLL_P2_DIVIDE_BY_4 |
                PLL_REF_INPUT_DREFCLK |
                DPLL_VCO_ENABLE;

        I915_WRITE(FP0(pipe), fp);
        I915_WRITE(FP1(pipe), fp);

        I915_WRITE(HTOTAL(pipe), (640 - 1) | ((800 - 1) << 16));
        I915_WRITE(HBLANK(pipe), (640 - 1) | ((800 - 1) << 16));
        I915_WRITE(HSYNC(pipe), (656 - 1) | ((752 - 1) << 16));
        I915_WRITE(VTOTAL(pipe), (480 - 1) | ((525 - 1) << 16));
        I915_WRITE(VBLANK(pipe), (480 - 1) | ((525 - 1) << 16));
        I915_WRITE(VSYNC(pipe), (490 - 1) | ((492 - 1) << 16));
        I915_WRITE(PIPESRC(pipe), ((640 - 1) << 16) | (480 - 1));

        /*
         * Apparently we need to have VGA mode enabled prior to changing
         * the P1/P2 dividers. Otherwise the DPLL will keep using the old
         * dividers, even though the register value does change.
         */
        I915_WRITE(DPLL(pipe), dpll & ~DPLL_VGA_MODE_DIS);
        I915_WRITE(DPLL(pipe), dpll);

        /* Wait for the clocks to stabilize. */
        POSTING_READ(DPLL(pipe));
        udelay(150);

        /* The pixel multiplier can only be updated once the
         * DPLL is enabled and the clocks are stable.
         *
         * So write it again.
         */
        I915_WRITE(DPLL(pipe), dpll);

        /* We do this three times for luck */
        for (i = 0; i < 3 ; i++) {
                I915_WRITE(DPLL(pipe), dpll);
                POSTING_READ(DPLL(pipe));
                udelay(150); /* wait for warmup */
        }

        I915_WRITE(PIPECONF(pipe), PIPECONF_ENABLE | PIPECONF_PROGRESSIVE);
        POSTING_READ(PIPECONF(pipe));

        intel_wait_for_pipe_scanline_moving(crtc);
}

void i830_disable_pipe(struct drm_i915_private *dev_priv, enum i915_pipe pipe)
{
        struct intel_crtc *crtc = intel_get_crtc_for_pipe(dev_priv, pipe);

        DRM_DEBUG_KMS("disabling pipe %c due to force quirk\n",
                      pipe_name(pipe));

        WARN_ON(I915_READ(DSPCNTR(PLANE_A)) & DISPLAY_PLANE_ENABLE);
        WARN_ON(I915_READ(DSPCNTR(PLANE_B)) & DISPLAY_PLANE_ENABLE);
        WARN_ON(I915_READ(DSPCNTR(PLANE_C)) & DISPLAY_PLANE_ENABLE);
        WARN_ON(I915_READ(CURCNTR(PIPE_A)) & MCURSOR_MODE);
        WARN_ON(I915_READ(CURCNTR(PIPE_B)) & MCURSOR_MODE);

        I915_WRITE(PIPECONF(pipe), 0);
        POSTING_READ(PIPECONF(pipe));

        intel_wait_for_pipe_scanline_stopped(crtc);

        I915_WRITE(DPLL(pipe), DPLL_VGA_MODE_DIS);
        POSTING_READ(DPLL(pipe));
}

static void
intel_sanitize_plane_mapping(struct drm_i915_private *dev_priv)
{
        struct intel_crtc *crtc;

        if (INTEL_GEN(dev_priv) >= 4)
                return;

        for_each_intel_crtc(&dev_priv->drm, crtc) {
                struct intel_plane *plane =
                        to_intel_plane(crtc->base.primary);
                struct intel_crtc *plane_crtc;
                enum i915_pipe pipe;

                if (!plane->get_hw_state(plane, &pipe))
                        continue;

                if (pipe == crtc->pipe)
                        continue;

                DRM_DEBUG_KMS("%s attached to the wrong pipe, disabling plane\n",
                              plane->base.name);

                plane_crtc = intel_get_crtc_for_pipe(dev_priv, pipe);
                intel_plane_disable_noatomic(plane_crtc, plane);
        }
}

static bool intel_crtc_has_encoders(struct intel_crtc *crtc)
{
        struct drm_device *dev = crtc->base.dev;
        struct intel_encoder *encoder;

        for_each_encoder_on_crtc(dev, &crtc->base, encoder)
                return true;

        return false;
}

static struct intel_connector *intel_encoder_find_connector(struct intel_encoder *encoder)
{
        struct drm_device *dev = encoder->base.dev;
        struct intel_connector *connector;

        for_each_connector_on_encoder(dev, &encoder->base, connector)
                return connector;

        return NULL;
}

static bool has_pch_trancoder(struct drm_i915_private *dev_priv,
                              enum i915_pipe pch_transcoder)
{
        return HAS_PCH_IBX(dev_priv) || HAS_PCH_CPT(dev_priv) ||
                (HAS_PCH_LPT_H(dev_priv) && pch_transcoder == PIPE_A);
}

static void intel_sanitize_crtc(struct intel_crtc *crtc,
                                struct drm_modeset_acquire_ctx *ctx)
{
        struct drm_device *dev = crtc->base.dev;
        struct drm_i915_private *dev_priv = to_i915(dev);
        enum transcoder cpu_transcoder = crtc->config->cpu_transcoder;

        /* Clear any frame start delays used for debugging left by the BIOS */
        if (crtc->active && !transcoder_is_dsi(cpu_transcoder)) {
                i915_reg_t reg = PIPECONF(cpu_transcoder);

                I915_WRITE(reg,
                           I915_READ(reg) & ~PIPECONF_FRAME_START_DELAY_MASK);
        }

        if (crtc->active) {
                struct intel_plane *plane;

                /* Disable everything but the primary plane */
                for_each_intel_plane_on_crtc(dev, crtc, plane) {
                        const struct intel_plane_state *plane_state =
                                to_intel_plane_state(plane->base.state);

                        if (plane_state->base.visible &&
                            plane->base.type != DRM_PLANE_TYPE_PRIMARY)
                                intel_plane_disable_noatomic(crtc, plane);
                }
        }

        /* Adjust the state of the output pipe according to whether we
         * have active connectors/encoders. */
        if (crtc->active && !intel_crtc_has_encoders(crtc))
                intel_crtc_disable_noatomic(&crtc->base, ctx);

        if (crtc->active || HAS_GMCH_DISPLAY(dev_priv)) {
                /*
                 * We start out with underrun reporting disabled to avoid races.
                 * For correct bookkeeping mark this on active crtcs.
                 *
                 * Also on gmch platforms we dont have any hardware bits to
                 * disable the underrun reporting. Which means we need to start
                 * out with underrun reporting disabled also on inactive pipes,
                 * since otherwise we'll complain about the garbage we read when
                 * e.g. coming up after runtime pm.
                 *
                 * No protection against concurrent access is required - at
                 * worst a fifo underrun happens which also sets this to false.
                 */
                crtc->cpu_fifo_underrun_disabled = true;
                /*
                 * We track the PCH trancoder underrun reporting state
                 * within the crtc. With crtc for pipe A housing the underrun
                 * reporting state for PCH transcoder A, crtc for pipe B housing
                 * it for PCH transcoder B, etc. LPT-H has only PCH transcoder A,
                 * and marking underrun reporting as disabled for the non-existing
                 * PCH transcoders B and C would prevent enabling the south
                 * error interrupt (see cpt_can_enable_serr_int()).
                 */
                if (has_pch_trancoder(dev_priv, crtc->pipe))
                        crtc->pch_fifo_underrun_disabled = true;
        }
}

static bool has_bogus_dpll_config(const struct intel_crtc_state *crtc_state)
{
        struct drm_i915_private *dev_priv = to_i915(crtc_state->base.crtc->dev);

        /*
         * Some SNB BIOSen (eg. ASUS K53SV) are known to misprogram
         * the hardware when a high res displays plugged in. DPLL P
         * divider is zero, and the pipe timings are bonkers. We'll
         * try to disable everything in that case.
         *
         * FIXME would be nice to be able to sanitize this state
         * without several WARNs, but for now let's take the easy
         * road.
         */
        return IS_GEN6(dev_priv) &&
                crtc_state->base.active &&
                crtc_state->shared_dpll &&
                crtc_state->port_clock == 0;
}

static void intel_sanitize_encoder(struct intel_encoder *encoder)
{
        struct intel_connector *connector;
        struct intel_crtc *crtc = to_intel_crtc(encoder->base.crtc);
        struct intel_crtc_state *crtc_state = crtc ?
                to_intel_crtc_state(crtc->base.state) : NULL;

        /* We need to check both for a crtc link (meaning that the
         * encoder is active and trying to read from a pipe) and the
         * pipe itself being active. */
        bool has_active_crtc = crtc_state &&
                crtc_state->base.active;

        if (crtc_state && has_bogus_dpll_config(crtc_state)) {
                DRM_DEBUG_KMS("BIOS has misprogrammed the hardware. Disabling pipe %c\n",
                              pipe_name(crtc->pipe));
                has_active_crtc = false;
        }

        connector = intel_encoder_find_connector(encoder);
        if (connector && !has_active_crtc) {
                DRM_DEBUG_KMS("[ENCODER:%d:%s] has active connectors but no active pipe!\n",
                              encoder->base.base.id,
                              encoder->base.name);

                /* Connector is active, but has no active pipe. This is
                 * fallout from our resume register restoring. Disable
                 * the encoder manually again. */
                if (crtc_state) {
                        struct drm_encoder *best_encoder;

                        DRM_DEBUG_KMS("[ENCODER:%d:%s] manually disabled\n",
                                      encoder->base.base.id,
                                      encoder->base.name);

                        /* avoid oopsing in case the hooks consult best_encoder */
                        best_encoder = connector->base.state->best_encoder;
                        connector->base.state->best_encoder = &encoder->base;

                        if (encoder->disable)
                                encoder->disable(encoder, crtc_state,
                                                 connector->base.state);
                        if (encoder->post_disable)
                                encoder->post_disable(encoder, crtc_state,
                                                      connector->base.state);

                        connector->base.state->best_encoder = best_encoder;
                }
                encoder->base.crtc = NULL;

                /* Inconsistent output/port/pipe state happens presumably due to
                 * a bug in one of the get_hw_state functions. Or someplace else
                 * in our code, like the register restore mess on resume. Clamp
                 * things to off as a safer default. */

                connector->base.dpms = DRM_MODE_DPMS_OFF;
                connector->base.encoder = NULL;
        }

        /* notify opregion of the sanitized encoder state */
        intel_opregion_notify_encoder(encoder, connector && has_active_crtc);
}

void i915_redisable_vga_power_on(struct drm_i915_private *dev_priv)
{
        i915_reg_t vga_reg = i915_vgacntrl_reg(dev_priv);

        if (!(I915_READ(vga_reg) & VGA_DISP_DISABLE)) {
                DRM_DEBUG_KMS("Something enabled VGA plane, disabling it\n");
                i915_disable_vga(dev_priv);
        }
}

void i915_redisable_vga(struct drm_i915_private *dev_priv)
{
        /* This function can be called both from intel_modeset_setup_hw_state or
         * at a very early point in our resume sequence, where the power well
         * structures are not yet restored. Since this function is at a very
         * paranoid "someone might have enabled VGA while we were not looking"
         * level, just check if the power well is enabled instead of trying to
         * follow the "don't touch the power well if we don't need it" policy
         * the rest of the driver uses. */
        if (!intel_display_power_get_if_enabled(dev_priv, POWER_DOMAIN_VGA))
                return;

        i915_redisable_vga_power_on(dev_priv);

        intel_display_power_put(dev_priv, POWER_DOMAIN_VGA);
}

/* FIXME read out full plane state for all planes */
static void readout_plane_state(struct drm_i915_private *dev_priv)
{
        struct intel_plane *plane;
        struct intel_crtc *crtc;

        for_each_intel_plane(&dev_priv->drm, plane) {
                struct intel_plane_state *plane_state =
                        to_intel_plane_state(plane->base.state);
                struct intel_crtc_state *crtc_state;
                enum i915_pipe pipe = PIPE_A;
                bool visible;

                visible = plane->get_hw_state(plane, &pipe);

                crtc = intel_get_crtc_for_pipe(dev_priv, pipe);
                crtc_state = to_intel_crtc_state(crtc->base.state);

                intel_set_plane_visible(crtc_state, plane_state, visible);
        }

        for_each_intel_crtc(&dev_priv->drm, crtc) {
                struct intel_crtc_state *crtc_state =
                        to_intel_crtc_state(crtc->base.state);

                fixup_active_planes(crtc_state);
        }
}

static void intel_modeset_readout_hw_state(struct drm_device *dev)
{
        struct drm_i915_private *dev_priv = to_i915(dev);
        enum i915_pipe pipe;
        struct intel_crtc *crtc;
        struct intel_encoder *encoder;
        struct intel_connector *connector;
        struct drm_connector_list_iter conn_iter;
        int i;

        dev_priv->active_crtcs = 0;

        for_each_intel_crtc(dev, crtc) {
                struct intel_crtc_state *crtc_state =
                        to_intel_crtc_state(crtc->base.state);

                __drm_atomic_helper_crtc_destroy_state(&crtc_state->base);
                memset(crtc_state, 0, sizeof(*crtc_state));
                crtc_state->base.crtc = &crtc->base;

                crtc_state->base.active = crtc_state->base.enable =
                        dev_priv->display.get_pipe_config(crtc, crtc_state);

                crtc->base.enabled = crtc_state->base.enable;
                crtc->active = crtc_state->base.active;

                if (crtc_state->base.active)
                        dev_priv->active_crtcs |= 1 << crtc->pipe;

                DRM_DEBUG_KMS("[CRTC:%d:%s] hw state readout: %s\n",
                              crtc->base.base.id, crtc->base.name,
                              enableddisabled(crtc_state->base.active));
        }

        readout_plane_state(dev_priv);

        for (i = 0; i < dev_priv->num_shared_dpll; i++) {
                struct intel_shared_dpll *pll = &dev_priv->shared_dplls[i];

                pll->on = pll->info->funcs->get_hw_state(dev_priv, pll,
                                                        &pll->state.hw_state);
                pll->state.crtc_mask = 0;
                for_each_intel_crtc(dev, crtc) {
                        struct intel_crtc_state *crtc_state =
                                to_intel_crtc_state(crtc->base.state);

                        if (crtc_state->base.active &&
                            crtc_state->shared_dpll == pll)
                                pll->state.crtc_mask |= 1 << crtc->pipe;
                }
                pll->active_mask = pll->state.crtc_mask;

                DRM_DEBUG_KMS("%s hw state readout: crtc_mask 0x%08x, on %i\n",
                              pll->info->name, pll->state.crtc_mask, pll->on);
        }

        for_each_intel_encoder(dev, encoder) {
                pipe = 0;

                if (encoder->get_hw_state(encoder, &pipe)) {
                        struct intel_crtc_state *crtc_state;

                        crtc = intel_get_crtc_for_pipe(dev_priv, pipe);
                        crtc_state = to_intel_crtc_state(crtc->base.state);

                        encoder->base.crtc = &crtc->base;
                        encoder->get_config(encoder, crtc_state);
                } else {
                        encoder->base.crtc = NULL;
                }

                DRM_DEBUG_KMS("[ENCODER:%d:%s] hw state readout: %s, pipe %c\n",
                              encoder->base.base.id, encoder->base.name,
                              enableddisabled(encoder->base.crtc),
                              pipe_name(pipe));
        }

        drm_connector_list_iter_begin(dev, &conn_iter);
        for_each_intel_connector_iter(connector, &conn_iter) {
                if (connector->get_hw_state(connector)) {
                        connector->base.dpms = DRM_MODE_DPMS_ON;

                        encoder = connector->encoder;
                        connector->base.encoder = &encoder->base;

                        if (encoder->base.crtc &&
                            encoder->base.crtc->state->active) {
                                /*
                                 * This has to be done during hardware readout
                                 * because anything calling .crtc_disable may
                                 * rely on the connector_mask being accurate.
                                 */
                                encoder->base.crtc->state->connector_mask |=
                                        drm_connector_mask(&connector->base);
                                encoder->base.crtc->state->encoder_mask |=
                                        drm_encoder_mask(&encoder->base);
                        }

                } else {
                        connector->base.dpms = DRM_MODE_DPMS_OFF;
                        connector->base.encoder = NULL;
                }
                DRM_DEBUG_KMS("[CONNECTOR:%d:%s] hw state readout: %s\n",
                              connector->base.base.id, connector->base.name,
                              enableddisabled(connector->base.encoder));
        }
        drm_connector_list_iter_end(&conn_iter);

        for_each_intel_crtc(dev, crtc) {
                struct intel_crtc_state *crtc_state =
                        to_intel_crtc_state(crtc->base.state);
                int min_cdclk = 0;

                memset(&crtc->base.mode, 0, sizeof(crtc->base.mode));
                if (crtc_state->base.active) {
                        intel_mode_from_pipe_config(&crtc->base.mode, crtc_state);
                        crtc->base.mode.hdisplay = crtc_state->pipe_src_w;
                        crtc->base.mode.vdisplay = crtc_state->pipe_src_h;
                        intel_mode_from_pipe_config(&crtc_state->base.adjusted_mode, crtc_state);
                        WARN_ON(drm_atomic_set_mode_for_crtc(crtc->base.state, &crtc->base.mode));

                        /*
                         * The initial mode needs to be set in order to keep
                         * the atomic core happy. It wants a valid mode if the
                         * crtc's enabled, so we do the above call.
                         *
                         * But we don't set all the derived state fully, hence
                         * set a flag to indicate that a full recalculation is
                         * needed on the next commit.
                         */
                        crtc_state->base.mode.private_flags = I915_MODE_FLAG_INHERITED;

                        intel_crtc_compute_pixel_rate(crtc_state);

                        if (dev_priv->display.modeset_calc_cdclk) {
                                min_cdclk = intel_crtc_compute_min_cdclk(crtc_state);
                                if (WARN_ON(min_cdclk < 0))
                                        min_cdclk = 0;
                        }

                        drm_calc_timestamping_constants(&crtc->base,
                                                        &crtc_state->base.adjusted_mode);
                        update_scanline_offset(crtc);
                }

                dev_priv->min_cdclk[crtc->pipe] = min_cdclk;
                dev_priv->min_voltage_level[crtc->pipe] =
                        crtc_state->min_voltage_level;

                intel_pipe_config_sanity_check(dev_priv, crtc_state);
        }
}

static void
get_encoder_power_domains(struct drm_i915_private *dev_priv)
{
        struct intel_encoder *encoder;

        for_each_intel_encoder(&dev_priv->drm, encoder) {
                u64 get_domains;
                enum intel_display_power_domain domain;
                struct intel_crtc_state *crtc_state;

                if (!encoder->get_power_domains)
                        continue;

                /*
                 * MST-primary and inactive encoders don't have a crtc state
                 * and neither of these require any power domain references.
                 */
                if (!encoder->base.crtc)
                        continue;

                crtc_state = to_intel_crtc_state(encoder->base.crtc->state);
                get_domains = encoder->get_power_domains(encoder, crtc_state);
                for_each_power_domain(domain, get_domains)
                        intel_display_power_get(dev_priv, domain);
        }
}

static void intel_early_display_was(struct drm_i915_private *dev_priv)
{
        /* Display WA #1185 WaDisableDARBFClkGating:cnl,glk */
        if (IS_CANNONLAKE(dev_priv) || IS_GEMINILAKE(dev_priv))
                I915_WRITE(GEN9_CLKGATE_DIS_0, I915_READ(GEN9_CLKGATE_DIS_0) |
                           DARBF_GATING_DIS);

        if (IS_HASWELL(dev_priv)) {
                /*
                 * WaRsPkgCStateDisplayPMReq:hsw
                 * System hang if this isn't done before disabling all planes!
                 */
                I915_WRITE(CHICKEN_PAR1_1,
                           I915_READ(CHICKEN_PAR1_1) | FORCE_ARB_IDLE_PLANES);
        }
}

/* Scan out the current hw modeset state,
 * and sanitizes it to the current state
 */
static void
intel_modeset_setup_hw_state(struct drm_device *dev,
                             struct drm_modeset_acquire_ctx *ctx)
{
        struct drm_i915_private *dev_priv = to_i915(dev);
        struct intel_crtc *crtc;
        struct intel_encoder *encoder;
        int i;

        intel_display_power_get(dev_priv, POWER_DOMAIN_INIT);

        intel_early_display_was(dev_priv);
        intel_modeset_readout_hw_state(dev);

        /* HW state is read out, now we need to sanitize this mess. */
        get_encoder_power_domains(dev_priv);

        /*
         * intel_sanitize_plane_mapping() may need to do vblank
         * waits, so we need vblank interrupts restored beforehand.
         */
        for_each_intel_crtc(&dev_priv->drm, crtc) {
                drm_crtc_vblank_reset(&crtc->base);

                if (crtc->active)
                        drm_crtc_vblank_on(&crtc->base);
        }

        intel_sanitize_plane_mapping(dev_priv);

        for_each_intel_encoder(dev, encoder)
                intel_sanitize_encoder(encoder);

        for_each_intel_crtc(&dev_priv->drm, crtc) {
                intel_sanitize_crtc(crtc, ctx);
                intel_dump_pipe_config(crtc, crtc->config,
                                       "[setup_hw_state]");
        }

        intel_modeset_update_connector_atomic_state(dev);

        for (i = 0; i < dev_priv->num_shared_dpll; i++) {
                struct intel_shared_dpll *pll = &dev_priv->shared_dplls[i];

                if (!pll->on || pll->active_mask)
                        continue;

                DRM_DEBUG_KMS("%s enabled but not in use, disabling\n",
                              pll->info->name);

                pll->info->funcs->disable(dev_priv, pll);
                pll->on = false;
        }

        if (IS_G4X(dev_priv)) {
                g4x_wm_get_hw_state(dev);
                g4x_wm_sanitize(dev_priv);
        } else if (IS_VALLEYVIEW(dev_priv) || IS_CHERRYVIEW(dev_priv)) {
                vlv_wm_get_hw_state(dev);
                vlv_wm_sanitize(dev_priv);
        } else if (INTEL_GEN(dev_priv) >= 9) {
                skl_wm_get_hw_state(dev);
        } else if (HAS_PCH_SPLIT(dev_priv)) {
                ilk_wm_get_hw_state(dev);
        }

        for_each_intel_crtc(dev, crtc) {
                u64 put_domains;

                put_domains = modeset_get_crtc_power_domains(&crtc->base, crtc->config);
                if (WARN_ON(put_domains))
                        modeset_put_power_domains(dev_priv, put_domains);
        }

        intel_display_power_put(dev_priv, POWER_DOMAIN_INIT);

        intel_fbc_init_pipe_state(dev_priv);
}

void intel_display_resume(struct drm_device *dev)
{
        struct drm_i915_private *dev_priv = to_i915(dev);
        struct drm_atomic_state *state = dev_priv->modeset_restore_state;
        struct drm_modeset_acquire_ctx ctx;
        int ret;

        dev_priv->modeset_restore_state = NULL;
        if (state)
                state->acquire_ctx = &ctx;

        drm_modeset_acquire_init(&ctx, 0);

        while (1) {
                ret = drm_modeset_lock_all_ctx(dev, &ctx);
                if (ret != -EDEADLK)
                        break;

                drm_modeset_backoff(&ctx);
        }

        if (!ret)
                ret = __intel_display_resume(dev, state, &ctx);

        intel_enable_ipc(dev_priv);
        drm_modeset_drop_locks(&ctx);
        drm_modeset_acquire_fini(&ctx);

        if (ret)
                DRM_ERROR("Restoring old state failed with %i\n", ret);
        if (state)
                drm_atomic_state_put(state);
}

int intel_connector_register(struct drm_connector *connector)
{
        struct intel_connector *intel_connector = to_intel_connector(connector);
        int ret;

        ret = intel_backlight_device_register(intel_connector);
        if (ret)
                goto err;

        return 0;

err:
        return ret;
}

void intel_connector_unregister(struct drm_connector *connector)
{
        struct intel_connector *intel_connector = to_intel_connector(connector);

        intel_backlight_device_unregister(intel_connector);
        intel_panel_destroy_backlight(connector);
}

static void intel_hpd_poll_fini(struct drm_device *dev)
{
        struct intel_connector *connector;
        struct drm_connector_list_iter conn_iter;

        /* Kill all the work that may have been queued by hpd. */
        drm_connector_list_iter_begin(dev, &conn_iter);
        for_each_intel_connector_iter(connector, &conn_iter) {
                if (connector->modeset_retry_work.func)
                        cancel_work_sync(&connector->modeset_retry_work);
                if (connector->hdcp_shim) {
                        cancel_delayed_work_sync(&connector->hdcp_check_work);
                        cancel_work_sync(&connector->hdcp_prop_work);
                }
        }
        drm_connector_list_iter_end(&conn_iter);
}

void intel_modeset_cleanup(struct drm_device *dev)
{
        struct drm_i915_private *dev_priv = to_i915(dev);

        flush_workqueue(dev_priv->modeset_wq);

        flush_work(&dev_priv->atomic_helper.free_work);
        WARN_ON(!llist_empty(&dev_priv->atomic_helper.free_list));

        /*
         * Interrupts and polling as the first thing to avoid creating havoc.
         * Too much stuff here (turning of connectors, ...) would
         * experience fancy races otherwise.
         */
        intel_irq_uninstall(dev_priv);

        /*
         * Due to the hpd irq storm handling the hotplug work can re-arm the
         * poll handlers. Hence disable polling after hpd handling is shut down.
         */
        intel_hpd_poll_fini(dev);

        /* poll work can call into fbdev, hence clean that up afterwards */
        intel_fbdev_fini(dev_priv);

        intel_unregister_dsm_handler();

        intel_fbc_global_disable(dev_priv);

        /* flush any delayed tasks or pending work */
        flush_scheduled_work();

        drm_mode_config_cleanup(dev);

        intel_cleanup_overlay(dev_priv);

        intel_teardown_gmbus(dev_priv);

        destroy_workqueue(dev_priv->modeset_wq);
}

void intel_connector_attach_encoder(struct intel_connector *connector,
                                    struct intel_encoder *encoder)
{
        connector->encoder = encoder;
        drm_connector_attach_encoder(&connector->base, &encoder->base);
}

/*
 * set vga decode state - true == enable VGA decode
 */
int intel_modeset_vga_set_state(struct drm_i915_private *dev_priv, bool state)
{
        unsigned reg = INTEL_GEN(dev_priv) >= 6 ? SNB_GMCH_CTRL : INTEL_GMCH_CTRL;
        u16 gmch_ctrl;

        if (pci_read_config_word(dev_priv->bridge_dev, reg, &gmch_ctrl)) {
                DRM_ERROR("failed to read control word\n");
                return -EIO;
        }

        if (!!(gmch_ctrl & INTEL_GMCH_VGA_DISABLE) == !state)
                return 0;

        if (state)
                gmch_ctrl &= ~INTEL_GMCH_VGA_DISABLE;
        else
                gmch_ctrl |= INTEL_GMCH_VGA_DISABLE;

        if (pci_write_config_word(dev_priv->bridge_dev, reg, gmch_ctrl)) {
                DRM_ERROR("failed to write control word\n");
                return -EIO;
        }

        return 0;
}

#if IS_ENABLED(CONFIG_DRM_I915_CAPTURE_ERROR)

struct intel_display_error_state {

        u32 power_well_driver;

        int num_transcoders;

        struct intel_cursor_error_state {
                u32 control;
                u32 position;
                u32 base;
                u32 size;
        } cursor[I915_MAX_PIPES];

        struct intel_pipe_error_state {
                bool power_domain_on;
                u32 source;
                u32 stat;
        } pipe[I915_MAX_PIPES];

        struct intel_plane_error_state {
                u32 control;
                u32 stride;
                u32 size;
                u32 pos;
                u32 addr;
                u32 surface;
                u32 tile_offset;
        } plane[I915_MAX_PIPES];

        struct intel_transcoder_error_state {
                bool power_domain_on;
                enum transcoder cpu_transcoder;

                u32 conf;

                u32 htotal;
                u32 hblank;
                u32 hsync;
                u32 vtotal;
                u32 vblank;
                u32 vsync;
        } transcoder[4];
};

struct intel_display_error_state *
intel_display_capture_error_state(struct drm_i915_private *dev_priv)
{
        struct intel_display_error_state *error;
        int transcoders[] = {
                TRANSCODER_A,
                TRANSCODER_B,
                TRANSCODER_C,
                TRANSCODER_EDP,
        };
        int i;

        if (INTEL_INFO(dev_priv)->num_pipes == 0)
                return NULL;

        error = kzalloc(sizeof(*error), GFP_ATOMIC);
        if (error == NULL)
                return NULL;

        if (IS_HASWELL(dev_priv) || IS_BROADWELL(dev_priv))
                error->power_well_driver = I915_READ(HSW_PWR_WELL_CTL2);

        for_each_pipe(dev_priv, i) {
                error->pipe[i].power_domain_on =
                        __intel_display_power_is_enabled(dev_priv,
                                                         POWER_DOMAIN_PIPE(i));
                if (!error->pipe[i].power_domain_on)
                        continue;

                error->cursor[i].control = I915_READ(CURCNTR(i));
                error->cursor[i].position = I915_READ(CURPOS(i));
                error->cursor[i].base = I915_READ(CURBASE(i));

                error->plane[i].control = I915_READ(DSPCNTR(i));
                error->plane[i].stride = I915_READ(DSPSTRIDE(i));
                if (INTEL_GEN(dev_priv) <= 3) {
                        error->plane[i].size = I915_READ(DSPSIZE(i));
                        error->plane[i].pos = I915_READ(DSPPOS(i));
                }
                if (INTEL_GEN(dev_priv) <= 7 && !IS_HASWELL(dev_priv))
                        error->plane[i].addr = I915_READ(DSPADDR(i));
                if (INTEL_GEN(dev_priv) >= 4) {
                        error->plane[i].surface = I915_READ(DSPSURF(i));
                        error->plane[i].tile_offset = I915_READ(DSPTILEOFF(i));
                }

                error->pipe[i].source = I915_READ(PIPESRC(i));

                if (HAS_GMCH_DISPLAY(dev_priv))
                        error->pipe[i].stat = I915_READ(PIPESTAT(i));
        }

        /* Note: this does not include DSI transcoders. */
        error->num_transcoders = INTEL_INFO(dev_priv)->num_pipes;
        if (HAS_DDI(dev_priv))
                error->num_transcoders++; /* Account for eDP. */

        for (i = 0; i < error->num_transcoders; i++) {
                enum transcoder cpu_transcoder = transcoders[i];

                error->transcoder[i].power_domain_on =
                        __intel_display_power_is_enabled(dev_priv,
                                POWER_DOMAIN_TRANSCODER(cpu_transcoder));
                if (!error->transcoder[i].power_domain_on)
                        continue;

                error->transcoder[i].cpu_transcoder = cpu_transcoder;

                error->transcoder[i].conf = I915_READ(PIPECONF(cpu_transcoder));
                error->transcoder[i].htotal = I915_READ(HTOTAL(cpu_transcoder));
                error->transcoder[i].hblank = I915_READ(HBLANK(cpu_transcoder));
                error->transcoder[i].hsync = I915_READ(HSYNC(cpu_transcoder));
                error->transcoder[i].vtotal = I915_READ(VTOTAL(cpu_transcoder));
                error->transcoder[i].vblank = I915_READ(VBLANK(cpu_transcoder));
                error->transcoder[i].vsync = I915_READ(VSYNC(cpu_transcoder));
        }

        return error;
}

#define err_printf(e, ...) i915_error_printf(e, __VA_ARGS__)

void
intel_display_print_error_state(struct drm_i915_error_state_buf *m,
                                struct intel_display_error_state *error)
{
        struct drm_i915_private *dev_priv = m->i915;
        int i;

        if (!error)
                return;

        err_printf(m, "Num Pipes: %d\n", INTEL_INFO(dev_priv)->num_pipes);
        if (IS_HASWELL(dev_priv) || IS_BROADWELL(dev_priv))
                err_printf(m, "PWR_WELL_CTL2: %08x\n",
                           error->power_well_driver);
        for_each_pipe(dev_priv, i) {
                err_printf(m, "Pipe [%d]:\n", i);
                err_printf(m, "  Power: %s\n",
                           onoff(error->pipe[i].power_domain_on));
                err_printf(m, "  SRC: %08x\n", error->pipe[i].source);
                err_printf(m, "  STAT: %08x\n", error->pipe[i].stat);

                err_printf(m, "Plane [%d]:\n", i);
                err_printf(m, "  CNTR: %08x\n", error->plane[i].control);
                err_printf(m, "  STRIDE: %08x\n", error->plane[i].stride);
                if (INTEL_GEN(dev_priv) <= 3) {
                        err_printf(m, "  SIZE: %08x\n", error->plane[i].size);
                        err_printf(m, "  POS: %08x\n", error->plane[i].pos);
                }
                if (INTEL_GEN(dev_priv) <= 7 && !IS_HASWELL(dev_priv))
                        err_printf(m, "  ADDR: %08x\n", error->plane[i].addr);
                if (INTEL_GEN(dev_priv) >= 4) {
                        err_printf(m, "  SURF: %08x\n", error->plane[i].surface);
                        err_printf(m, "  TILEOFF: %08x\n", error->plane[i].tile_offset);
                }

                err_printf(m, "Cursor [%d]:\n", i);
                err_printf(m, "  CNTR: %08x\n", error->cursor[i].control);
                err_printf(m, "  POS: %08x\n", error->cursor[i].position);
                err_printf(m, "  BASE: %08x\n", error->cursor[i].base);
        }

        for (i = 0; i < error->num_transcoders; i++) {
                err_printf(m, "CPU transcoder: %s\n",
                           transcoder_name(error->transcoder[i].cpu_transcoder));
                err_printf(m, "  Power: %s\n",
                           onoff(error->transcoder[i].power_domain_on));
                err_printf(m, "  CONF: %08x\n", error->transcoder[i].conf);
                err_printf(m, "  HTOTAL: %08x\n", error->transcoder[i].htotal);
                err_printf(m, "  HBLANK: %08x\n", error->transcoder[i].hblank);
                err_printf(m, "  HSYNC: %08x\n", error->transcoder[i].hsync);
                err_printf(m, "  VTOTAL: %08x\n", error->transcoder[i].vtotal);
                err_printf(m, "  VBLANK: %08x\n", error->transcoder[i].vblank);
                err_printf(m, "  VSYNC: %08x\n", error->transcoder[i].vsync);
        }
}

#endif