/*
 * Copyright 2018 Red Hat Inc.
 *
 * 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 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 COPYRIGHT HOLDER(S) OR AUTHOR(S) 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.
 */
#include "head.h"
#include "base.h"
#include "core.h"
#include "curs.h"
#include "ovly.h"
#include "crc.h"

#include <nvif/class.h>
#include <nvif/event.h>
#include <nvif/cl0046.h>

#include <drm/drm_atomic.h>
#include <drm/drm_atomic_helper.h>
#include <drm/drm_edid.h>
#include <drm/drm_vblank.h>
#include "nouveau_connector.h"

void
nv50_head_flush_clr(struct nv50_head *head,
                    struct nv50_head_atom *asyh, bool flush)
{
        union nv50_head_atom_mask clr = {
                .mask = asyh->clr.mask & ~(flush ? 0 : asyh->set.mask),
        };

        lockdep_assert_held(&head->disp->mutex);

        if (clr.crc)  nv50_crc_atomic_clr(head);
        if (clr.olut) head->func->olut_clr(head);
        if (clr.core) head->func->core_clr(head);
        if (clr.curs) head->func->curs_clr(head);
}

void
nv50_head_flush_set_wndw(struct nv50_head *head, struct nv50_head_atom *asyh)
{
        if (asyh->set.curs   ) head->func->curs_set(head, asyh);
        if (asyh->set.olut   ) {
                asyh->olut.offset = nv50_lut_load(&head->olut,
                                                  asyh->olut.buffer,
                                                  asyh->state.gamma_lut,
                                                  asyh->olut.load);
                head->func->olut_set(head, asyh);
        }
}

void
nv50_head_flush_set(struct nv50_head *head, struct nv50_head_atom *asyh)
{
        lockdep_assert_held(&head->disp->mutex);

        if (asyh->set.view   ) head->func->view    (head, asyh);
        if (asyh->set.mode   ) head->func->mode    (head, asyh);
        if (asyh->set.core   ) head->func->core_set(head, asyh);
        if (asyh->set.base   ) head->func->base    (head, asyh);
        if (asyh->set.ovly   ) head->func->ovly    (head, asyh);
        if (asyh->set.dither ) head->func->dither  (head, asyh);
        if (asyh->set.procamp) head->func->procamp (head, asyh);
        if (asyh->set.crc    ) nv50_crc_atomic_set (head, asyh);
        if (asyh->set.or     ) head->func->or      (head, asyh);
}

static void
nv50_head_atomic_check_procamp(struct nv50_head_atom *armh,
                               struct nv50_head_atom *asyh,
                               struct nouveau_conn_atom *asyc)
{
        const int vib = asyc->procamp.color_vibrance - 100;
        const int hue = asyc->procamp.vibrant_hue - 90;
        const int adj = (vib > 0) ? 50 : 0;
        asyh->procamp.sat.cos = ((vib * 2047 + adj) / 100) & 0xfff;
        asyh->procamp.sat.sin = ((hue * 2047) / 100) & 0xfff;
        asyh->set.procamp = true;
}

static void
nv50_head_atomic_check_dither(struct nv50_head_atom *armh,
                              struct nv50_head_atom *asyh,
                              struct nouveau_conn_atom *asyc)
{
        u32 mode = 0x00;

        if (asyc->dither.mode) {
                if (asyc->dither.mode == DITHERING_MODE_AUTO) {
                        if (asyh->base.depth > asyh->or.bpc * 3)
                                mode = DITHERING_MODE_DYNAMIC2X2;
                } else {
                        mode = asyc->dither.mode;
                }

                if (asyc->dither.depth == DITHERING_DEPTH_AUTO) {
                        if (asyh->or.bpc >= 8)
                                mode |= DITHERING_DEPTH_8BPC;
                } else {
                        mode |= asyc->dither.depth;
                }
        }

        asyh->dither.enable = NVVAL_GET(mode, NV507D, HEAD_SET_DITHER_CONTROL, ENABLE);
        asyh->dither.bits = NVVAL_GET(mode, NV507D, HEAD_SET_DITHER_CONTROL, BITS);
        asyh->dither.mode = NVVAL_GET(mode, NV507D, HEAD_SET_DITHER_CONTROL, MODE);
        asyh->set.dither = true;
}

static void
nv50_head_atomic_check_view(struct nv50_head_atom *armh,
                            struct nv50_head_atom *asyh,
                            struct nouveau_conn_atom *asyc)
{
        struct drm_connector *connector = asyc->state.connector;
        struct drm_display_mode *omode = &asyh->state.adjusted_mode;
        struct drm_display_mode *umode = &asyh->state.mode;
        int mode = asyc->scaler.mode;
        int umode_vdisplay, omode_hdisplay, omode_vdisplay;

        if (!asyc->scaler.full) {
                if (mode == DRM_MODE_SCALE_NONE)
                        omode = umode;
        } else {
                /* Non-EDID LVDS/eDP mode. */
                mode = DRM_MODE_SCALE_FULLSCREEN;
        }

        /* For the user-specified mode, we must ignore doublescan and
         * the like, but honor frame packing.
         */
        umode_vdisplay = umode->vdisplay;
        if ((umode->flags & DRM_MODE_FLAG_3D_MASK) == DRM_MODE_FLAG_3D_FRAME_PACKING)
                umode_vdisplay += umode->vtotal;
        asyh->view.iW = umode->hdisplay;
        asyh->view.iH = umode_vdisplay;
        /* For the output mode, we can just use the stock helper. */
        drm_mode_get_hv_timing(omode, &omode_hdisplay, &omode_vdisplay);
        asyh->view.oW = omode_hdisplay;
        asyh->view.oH = omode_vdisplay;

        /* Add overscan compensation if necessary, will keep the aspect
         * ratio the same as the backend mode unless overridden by the
         * user setting both hborder and vborder properties.
         */
        if ((asyc->scaler.underscan.mode == UNDERSCAN_ON ||
            (asyc->scaler.underscan.mode == UNDERSCAN_AUTO &&
             connector->display_info.is_hdmi))) {
                u32 bX = asyc->scaler.underscan.hborder;
                u32 bY = asyc->scaler.underscan.vborder;
                u32 r = (asyh->view.oH << 19) / asyh->view.oW;

                if (bX) {
                        asyh->view.oW -= (bX * 2);
                        if (bY) asyh->view.oH -= (bY * 2);
                        else    asyh->view.oH  = ((asyh->view.oW * r) + (r / 2)) >> 19;
                } else {
                        asyh->view.oW -= (asyh->view.oW >> 4) + 32;
                        if (bY) asyh->view.oH -= (bY * 2);
                        else    asyh->view.oH  = ((asyh->view.oW * r) + (r / 2)) >> 19;
                }
        }

        /* Handle CENTER/ASPECT scaling, taking into account the areas
         * removed already for overscan compensation.
         */
        switch (mode) {
        case DRM_MODE_SCALE_CENTER:
                /* NOTE: This will cause scaling when the input is
                 * larger than the output.
                 */
                asyh->view.oW = min(asyh->view.iW, asyh->view.oW);
                asyh->view.oH = min(asyh->view.iH, asyh->view.oH);
                break;
        case DRM_MODE_SCALE_ASPECT:
                /* Determine whether the scaling should be on width or on
                 * height. This is done by comparing the aspect ratios of the
                 * sizes. If the output AR is larger than input AR, that means
                 * we want to change the width (letterboxed on the
                 * left/right), otherwise on the height (letterboxed on the
                 * top/bottom).
                 *
                 * E.g. 4:3 (1.333) AR image displayed on a 16:10 (1.6) AR
                 * screen will have letterboxes on the left/right. However a
                 * 16:9 (1.777) AR image on that same screen will have
                 * letterboxes on the top/bottom.
                 *
                 * inputAR = iW / iH; outputAR = oW / oH
                 * outputAR > inputAR is equivalent to oW * iH > iW * oH
                 */
                if (asyh->view.oW * asyh->view.iH > asyh->view.iW * asyh->view.oH) {
                        /* Recompute output width, i.e. left/right letterbox */
                        u32 r = (asyh->view.iW << 19) / asyh->view.iH;
                        asyh->view.oW = ((asyh->view.oH * r) + (r / 2)) >> 19;
                } else {
                        /* Recompute output height, i.e. top/bottom letterbox */
                        u32 r = (asyh->view.iH << 19) / asyh->view.iW;
                        asyh->view.oH = ((asyh->view.oW * r) + (r / 2)) >> 19;
                }
                break;
        default:
                break;
        }

        asyh->set.view = true;
}

static int
nv50_head_atomic_check_lut(struct nv50_head *head,
                           struct nv50_head_atom *asyh)
{
        struct drm_device *dev = head->base.base.dev;
        struct drm_crtc *crtc = &head->base.base;
        struct nv50_disp *disp = nv50_disp(dev);
        struct nouveau_drm *drm = nouveau_drm(dev);
        struct drm_property_blob *olut = asyh->state.gamma_lut,
                                 *ilut = asyh->state.degamma_lut;
        int size;

        /* Ensure that the ilut is valid */
        if (ilut) {
                size = drm_color_lut_size(ilut);
                if (!head->func->ilut_check(size)) {
                        NV_ATOMIC(drm, "Invalid size %d for degamma on [CRTC:%d:%s]\n",
                                  size, crtc->base.id, crtc->name);
                        return -EINVAL;
                }
        }

        /* Determine whether core output LUT should be enabled. */
        if (olut) {
                /* Check if any window(s) have stolen the core output LUT
                 * to as an input LUT for legacy gamma + I8 colour format.
                 */
                if (asyh->wndw.olut) {
                        /* If any window has stolen the core output LUT,
                         * all of them must.
                         */
                        if (asyh->wndw.olut != asyh->wndw.mask)
                                return -EINVAL;
                        olut = NULL;
                }
        }

        if (!olut) {
                if (!head->func->olut_identity) {
                        asyh->olut.handle = 0;
                        return 0;
                }
                size = 0;
        } else {
                size = drm_color_lut_size(olut);
        }

        if (!head->func->olut(head, asyh, size)) {
                NV_ATOMIC(drm, "Invalid size %d for gamma on [CRTC:%d:%s]\n",
                          size, crtc->base.id, crtc->name);
                return -EINVAL;
        }
        asyh->olut.handle = disp->core->chan.vram.handle;
        asyh->olut.buffer = !asyh->olut.buffer;

        return 0;
}

static void
nv50_head_atomic_check_mode(struct nv50_head *head, struct nv50_head_atom *asyh)
{
        struct drm_display_mode *mode = &asyh->state.adjusted_mode;
        struct nv50_head_mode *m = &asyh->mode;
        u32 blankus;

        drm_mode_set_crtcinfo(mode, CRTC_INTERLACE_HALVE_V | CRTC_STEREO_DOUBLE);

        /*
         * DRM modes are defined in terms of a repeating interval
         * starting with the active display area.  The hardware modes
         * are defined in terms of a repeating interval starting one
         * unit (pixel or line) into the sync pulse.  So, add bias.
         */

        m->h.active = mode->crtc_htotal;
        m->h.synce  = mode->crtc_hsync_end - mode->crtc_hsync_start - 1;
        m->h.blanke = mode->crtc_hblank_end - mode->crtc_hsync_start - 1;
        m->h.blanks = m->h.blanke + mode->crtc_hdisplay;

        m->v.active = mode->crtc_vtotal;
        m->v.synce  = mode->crtc_vsync_end - mode->crtc_vsync_start - 1;
        m->v.blanke = mode->crtc_vblank_end - mode->crtc_vsync_start - 1;
        m->v.blanks = m->v.blanke + mode->crtc_vdisplay;

        /*XXX: Safe underestimate, even "0" works */
        blankus = (m->v.active - mode->crtc_vdisplay - 2) * m->h.active;
        blankus *= 1000;
        blankus /= mode->crtc_clock;
        m->v.blankus = blankus;

        if (mode->flags & DRM_MODE_FLAG_INTERLACE) {
                m->v.blank2e =  m->v.active + m->v.blanke;
                m->v.blank2s =  m->v.blank2e + mode->crtc_vdisplay;
                m->v.active  = (m->v.active * 2) + 1;
                m->interlace = true;
        } else {
                m->v.blank2e = 0;
                m->v.blank2s = 1;
                m->interlace = false;
        }
        m->clock = mode->crtc_clock;

        asyh->or.nhsync = !!(mode->flags & DRM_MODE_FLAG_NHSYNC);
        asyh->or.nvsync = !!(mode->flags & DRM_MODE_FLAG_NVSYNC);
        asyh->set.or = head->func->or != NULL;
        asyh->set.mode = true;
}

static int
nv50_head_atomic_check(struct drm_crtc *crtc, struct drm_atomic_state *state)
{
        struct drm_crtc_state *old_crtc_state = drm_atomic_get_old_crtc_state(state,
                                                                              crtc);
        struct drm_crtc_state *crtc_state = drm_atomic_get_new_crtc_state(state,
                                                                          crtc);
        struct nouveau_drm *drm = nouveau_drm(crtc->dev);
        struct nv50_head *head = nv50_head(crtc);
        struct nv50_head_atom *armh = nv50_head_atom(old_crtc_state);
        struct nv50_head_atom *asyh = nv50_head_atom(crtc_state);
        struct nouveau_conn_atom *asyc = NULL;
        struct drm_connector_state *conns;
        struct drm_connector *conn;
        int i, ret;
        bool check_lut = asyh->state.color_mgmt_changed ||
                         memcmp(&armh->wndw, &asyh->wndw, sizeof(asyh->wndw));

        NV_ATOMIC(drm, "%s atomic_check %d\n", crtc->name, asyh->state.active);

        if (check_lut) {
                ret = nv50_head_atomic_check_lut(head, asyh);
                if (ret)
                        return ret;
        }

        if (asyh->state.active) {
                for_each_new_connector_in_state(asyh->state.state, conn, conns, i) {
                        if (conns->crtc == crtc) {
                                asyc = nouveau_conn_atom(conns);
                                break;
                        }
                }

                if (armh->state.active) {
                        if (asyc) {
                                if (asyh->state.mode_changed)
                                        asyc->set.scaler = true;
                                if (armh->base.depth != asyh->base.depth)
                                        asyc->set.dither = true;
                        }
                } else {
                        if (asyc)
                                asyc->set.mask = ~0;
                        asyh->set.mask = ~0;
                        asyh->set.or = head->func->or != NULL;
                }

                if (asyh->state.mode_changed || asyh->state.connectors_changed)
                        nv50_head_atomic_check_mode(head, asyh);

                if (check_lut)
                        asyh->olut.visible = asyh->olut.handle != 0;

                if (asyc) {
                        if (asyc->set.scaler)
                                nv50_head_atomic_check_view(armh, asyh, asyc);
                        if (asyc->set.dither)
                                nv50_head_atomic_check_dither(armh, asyh, asyc);
                        if (asyc->set.procamp)
                                nv50_head_atomic_check_procamp(armh, asyh, asyc);
                }

                if (head->func->core_calc) {
                        head->func->core_calc(head, asyh);
                        if (!asyh->core.visible)
                                asyh->olut.visible = false;
                }

                asyh->set.base = armh->base.cpp != asyh->base.cpp;
                asyh->set.ovly = armh->ovly.cpp != asyh->ovly.cpp;
        } else {
                asyh->olut.visible = false;
                asyh->core.visible = false;
                asyh->curs.visible = false;
                asyh->base.cpp = 0;
                asyh->ovly.cpp = 0;
        }

        if (!drm_atomic_crtc_needs_modeset(&asyh->state)) {
                if (asyh->core.visible) {
                        if (memcmp(&armh->core, &asyh->core, sizeof(asyh->core)))
                                asyh->set.core = true;
                } else
                if (armh->core.visible) {
                        asyh->clr.core = true;
                }

                if (asyh->curs.visible) {
                        if (memcmp(&armh->curs, &asyh->curs, sizeof(asyh->curs)))
                                asyh->set.curs = true;
                } else
                if (armh->curs.visible) {
                        asyh->clr.curs = true;
                }

                if (asyh->olut.visible) {
                        if (memcmp(&armh->olut, &asyh->olut, sizeof(asyh->olut)))
                                asyh->set.olut = true;
                } else
                if (armh->olut.visible) {
                        asyh->clr.olut = true;
                }
        } else {
                asyh->clr.olut = armh->olut.visible;
                asyh->clr.core = armh->core.visible;
                asyh->clr.curs = armh->curs.visible;
                asyh->set.olut = asyh->olut.visible;
                asyh->set.core = asyh->core.visible;
                asyh->set.curs = asyh->curs.visible;
        }

        ret = nv50_crc_atomic_check_head(head, asyh, armh);
        if (ret)
                return ret;

        if (asyh->clr.mask || asyh->set.mask)
                nv50_atom(asyh->state.state)->lock_core = true;
        return 0;
}

static const struct drm_crtc_helper_funcs
nv50_head_help = {
        .atomic_check = nv50_head_atomic_check,
        .get_scanout_position = nouveau_display_scanoutpos,
};

static void
nv50_head_atomic_destroy_state(struct drm_crtc *crtc,
                               struct drm_crtc_state *state)
{
        struct nv50_head_atom *asyh = nv50_head_atom(state);
        __drm_atomic_helper_crtc_destroy_state(&asyh->state);
        kfree(asyh);
}

static struct drm_crtc_state *
nv50_head_atomic_duplicate_state(struct drm_crtc *crtc)
{
        struct nv50_head_atom *armh = nv50_head_atom(crtc->state);
        struct nv50_head_atom *asyh;
        if (!(asyh = kmalloc_obj(*asyh)))
                return NULL;
        __drm_atomic_helper_crtc_duplicate_state(crtc, &asyh->state);
        asyh->wndw = armh->wndw;
        asyh->view = armh->view;
        asyh->mode = armh->mode;
        asyh->olut = armh->olut;
        asyh->core = armh->core;
        asyh->curs = armh->curs;
        asyh->base = armh->base;
        asyh->ovly = armh->ovly;
        asyh->dither = armh->dither;
        asyh->procamp = armh->procamp;
        asyh->crc = armh->crc;
        asyh->or = armh->or;
        asyh->dp = armh->dp;
        asyh->clr.mask = 0;
        asyh->set.mask = 0;
        return &asyh->state;
}

static void
nv50_head_reset(struct drm_crtc *crtc)
{
        struct nv50_head_atom *asyh;

        if (WARN_ON(!(asyh = kzalloc_obj(*asyh))))
                return;

        if (crtc->state)
                nv50_head_atomic_destroy_state(crtc, crtc->state);

        __drm_atomic_helper_crtc_reset(crtc, &asyh->state);
}

static int
nv50_head_late_register(struct drm_crtc *crtc)
{
        return nv50_head_crc_late_register(nv50_head(crtc));
}

static void
nv50_head_destroy(struct drm_crtc *crtc)
{
        struct nv50_head *head = nv50_head(crtc);

        nvif_event_dtor(&head->base.vblank);
        nvif_head_dtor(&head->base.head);
        nv50_lut_fini(&head->olut);
        drm_crtc_cleanup(crtc);
        kfree(head);
}

static const struct drm_crtc_funcs
nv50_head_func = {
        .reset = nv50_head_reset,
        .destroy = nv50_head_destroy,
        .set_config = drm_atomic_helper_set_config,
        .page_flip = drm_atomic_helper_page_flip,
        .atomic_duplicate_state = nv50_head_atomic_duplicate_state,
        .atomic_destroy_state = nv50_head_atomic_destroy_state,
        .enable_vblank = nouveau_display_vblank_enable,
        .disable_vblank = nouveau_display_vblank_disable,
        .get_vblank_timestamp = drm_crtc_vblank_helper_get_vblank_timestamp,
        .late_register = nv50_head_late_register,
};

static const struct drm_crtc_funcs
nvd9_head_func = {
        .reset = nv50_head_reset,
        .destroy = nv50_head_destroy,
        .set_config = drm_atomic_helper_set_config,
        .page_flip = drm_atomic_helper_page_flip,
        .atomic_duplicate_state = nv50_head_atomic_duplicate_state,
        .atomic_destroy_state = nv50_head_atomic_destroy_state,
        .enable_vblank = nouveau_display_vblank_enable,
        .disable_vblank = nouveau_display_vblank_disable,
        .get_vblank_timestamp = drm_crtc_vblank_helper_get_vblank_timestamp,
        .verify_crc_source = nv50_crc_verify_source,
        .get_crc_sources = nv50_crc_get_sources,
        .set_crc_source = nv50_crc_set_source,
        .late_register = nv50_head_late_register,
};

static int
nv50_head_vblank_handler(struct nvif_event *event, void *repv, u32 repc)
{
        struct nouveau_crtc *nv_crtc = container_of(event, struct nouveau_crtc, vblank);

        if (drm_crtc_handle_vblank(&nv_crtc->base))
                nv50_crc_handle_vblank(nv50_head(&nv_crtc->base));

        return NVIF_EVENT_KEEP;
}

struct nv50_head *
nv50_head_create(struct drm_device *dev, int index)
{
        struct nouveau_drm *drm = nouveau_drm(dev);
        struct nv50_disp *disp = nv50_disp(dev);
        struct nv50_head *head;
        struct nv50_wndw *base, *ovly, *curs;
        struct nouveau_crtc *nv_crtc;
        struct drm_crtc *crtc;
        const struct drm_crtc_funcs *funcs;
        int ret;

        head = kzalloc_obj(*head);
        if (!head)
                return ERR_PTR(-ENOMEM);

        head->func = disp->core->func->head;
        head->disp = disp;
        head->base.index = index;

        if (disp->disp->object.oclass < GF110_DISP)
                funcs = &nv50_head_func;
        else
                funcs = &nvd9_head_func;

        if (disp->disp->object.oclass < GV100_DISP) {
                ret = nv50_base_new(drm, head->base.index, &base);
                ret = nv50_ovly_new(drm, head->base.index, &ovly);
        } else {
                ret = nv50_wndw_new(drm, DRM_PLANE_TYPE_PRIMARY,
                                    head->base.index * 2 + 0, &base);
                ret = nv50_wndw_new(drm, DRM_PLANE_TYPE_OVERLAY,
                                    head->base.index * 2 + 1, &ovly);
        }
        if (ret == 0)
                ret = nv50_curs_new(drm, head->base.index, &curs);
        if (ret) {
                kfree(head);
                return ERR_PTR(ret);
        }

        nv_crtc = &head->base;
        crtc = &nv_crtc->base;
        drm_crtc_init_with_planes(dev, crtc, &base->plane, &curs->plane,
                                  funcs, "head-%d", head->base.index);
        drm_crtc_helper_add(crtc, &nv50_head_help);
        /* Keep the legacy gamma size at 256 to avoid compatibility issues */
        drm_mode_crtc_set_gamma_size(crtc, 256);
        drm_crtc_enable_color_mgmt(crtc, base->func->ilut_size,
                                   disp->disp->object.oclass >= GF110_DISP,
                                   head->func->olut_size);

        if (head->func->olut_set) {
                ret = nv50_lut_init(disp, &drm->client.mmu, &head->olut);
                if (ret) {
                        nv50_head_destroy(crtc);
                        return ERR_PTR(ret);
                }
        }

        ret = nvif_head_ctor(disp->disp, head->base.base.name, head->base.index, &head->base.head);
        if (ret)
                return ERR_PTR(ret);

        ret = nvif_head_vblank_event_ctor(&head->base.head, "kmsVbl", nv50_head_vblank_handler,
                                          false, &nv_crtc->vblank);
        if (ret)
                return ERR_PTR(ret);

        return head;
}