/*
 * Copyright (C) 2008 Maarten Maathuis.
 * All Rights Reserved.
 *
 * 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 COPYRIGHT OWNER(S) AND/OR ITS SUPPLIERS 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 <acpi/video.h>

#include <drm/drm_atomic.h>
#include <drm/drm_atomic_helper.h>
#include <drm/drm_client_event.h>
#include <drm/drm_crtc_helper.h>
#include <drm/drm_dumb_buffers.h>
#include <drm/drm_fourcc.h>
#include <drm/drm_gem_framebuffer_helper.h>
#include <drm/drm_probe_helper.h>
#include <drm/drm_vblank.h>

#include "nouveau_crtc.h"
#include "nouveau_gem.h"
#include "nouveau_connector.h"
#include "nv50_display.h"

#include <nvif/class.h>
#include <nvif/if0011.h>
#include <nvif/if0013.h>
#include <dispnv50/crc.h>
#include <dispnv50/tile.h>

int
nouveau_display_vblank_enable(struct drm_crtc *crtc)
{
        struct nouveau_crtc *nv_crtc;

        nv_crtc = nouveau_crtc(crtc);
        nvif_event_allow(&nv_crtc->vblank);

        return 0;
}

void
nouveau_display_vblank_disable(struct drm_crtc *crtc)
{
        struct nouveau_crtc *nv_crtc;

        nv_crtc = nouveau_crtc(crtc);
        nvif_event_block(&nv_crtc->vblank);
}

static inline int
calc(int blanks, int blanke, int total, int line)
{
        if (blanke >= blanks) {
                if (line >= blanks)
                        line -= total;
        } else {
                if (line >= blanks)
                        line -= total;
                line -= blanke + 1;
        }
        return line;
}

static bool
nouveau_display_scanoutpos_head(struct drm_crtc *crtc, int *vpos, int *hpos,
                                ktime_t *stime, ktime_t *etime)
{
        struct drm_vblank_crtc *vblank = drm_crtc_vblank_crtc(crtc);
        struct nvif_head *head = &nouveau_crtc(crtc)->head;
        struct nvif_head_scanoutpos_v0 args;
        int retry = 20;
        bool ret = false;

        args.version = 0;

        do {
                ret = nvif_mthd(&head->object, NVIF_HEAD_V0_SCANOUTPOS, &args, sizeof(args));
                if (ret != 0)
                        return false;

                if (args.vline) {
                        ret = true;
                        break;
                }

                if (retry) ndelay(vblank->linedur_ns);
        } while (retry--);

        *hpos = args.hline;
        *vpos = calc(args.vblanks, args.vblanke, args.vtotal, args.vline);
        if (stime) *stime = ns_to_ktime(args.time[0]);
        if (etime) *etime = ns_to_ktime(args.time[1]);

        return ret;
}

bool
nouveau_display_scanoutpos(struct drm_crtc *crtc,
                           bool in_vblank_irq, int *vpos, int *hpos,
                           ktime_t *stime, ktime_t *etime,
                           const struct drm_display_mode *mode)
{
        return nouveau_display_scanoutpos_head(crtc, vpos, hpos,
                                               stime, etime);
}

static const struct drm_framebuffer_funcs nouveau_framebuffer_funcs = {
        .destroy = drm_gem_fb_destroy,
        .create_handle = drm_gem_fb_create_handle,
};

static void
nouveau_decode_mod(struct nouveau_drm *drm,
                   uint64_t modifier,
                   uint32_t *tile_mode,
                   uint8_t *kind)
{
        struct nouveau_display *disp = nouveau_display(drm->dev);
        BUG_ON(!tile_mode || !kind);

        if (modifier == DRM_FORMAT_MOD_LINEAR) {
                /* tile_mode will not be used in this case */
                *tile_mode = 0;
                *kind = 0;
        } else {
                /*
                 * Extract the block height and kind from the corresponding
                 * modifier fields.  See drm_fourcc.h for details.
                 */

                if ((modifier & (0xffull << 12)) == 0ull) {
                        /* Legacy modifier.  Translate to this dev's 'kind.' */
                        modifier |= disp->format_modifiers[0] & (0xffull << 12);
                }

                *tile_mode = (uint32_t)(modifier & 0xF);
                *kind = (uint8_t)((modifier >> 12) & 0xFF);

                if (drm->client.device.info.chipset >= 0xc0)
                        *tile_mode <<= 4;
        }
}

void
nouveau_framebuffer_get_layout(struct drm_framebuffer *fb,
                               uint32_t *tile_mode,
                               uint8_t *kind)
{
        if (fb->flags & DRM_MODE_FB_MODIFIERS) {
                struct nouveau_drm *drm = nouveau_drm(fb->dev);

                nouveau_decode_mod(drm, fb->modifier, tile_mode, kind);
        } else {
                const struct nouveau_bo *nvbo = nouveau_gem_object(fb->obj[0]);

                *tile_mode = nvbo->mode;
                *kind = nvbo->kind;
        }
}

static const u64 legacy_modifiers[] = {
        DRM_FORMAT_MOD_NVIDIA_16BX2_BLOCK(0),
        DRM_FORMAT_MOD_NVIDIA_16BX2_BLOCK(1),
        DRM_FORMAT_MOD_NVIDIA_16BX2_BLOCK(2),
        DRM_FORMAT_MOD_NVIDIA_16BX2_BLOCK(3),
        DRM_FORMAT_MOD_NVIDIA_16BX2_BLOCK(4),
        DRM_FORMAT_MOD_NVIDIA_16BX2_BLOCK(5),
        DRM_FORMAT_MOD_INVALID
};

static int
nouveau_validate_decode_mod(struct nouveau_drm *drm,
                            uint64_t modifier,
                            uint32_t *tile_mode,
                            uint8_t *kind)
{
        struct nouveau_display *disp = nouveau_display(drm->dev);
        int mod;

        if (drm->client.device.info.family < NV_DEVICE_INFO_V0_TESLA) {
                return -EINVAL;
        }

        BUG_ON(!disp->format_modifiers);

        for (mod = 0;
             (disp->format_modifiers[mod] != DRM_FORMAT_MOD_INVALID) &&
             (disp->format_modifiers[mod] != modifier);
             mod++);

        if (disp->format_modifiers[mod] == DRM_FORMAT_MOD_INVALID) {
                for (mod = 0;
                     (legacy_modifiers[mod] != DRM_FORMAT_MOD_INVALID) &&
                     (legacy_modifiers[mod] != modifier);
                     mod++);
                if (legacy_modifiers[mod] == DRM_FORMAT_MOD_INVALID)
                        return -EINVAL;
        }

        nouveau_decode_mod(drm, modifier, tile_mode, kind);

        return 0;
}

static int
nouveau_check_bl_size(struct nouveau_drm *drm, struct nouveau_bo *nvbo,
                      uint32_t offset, uint32_t stride, uint32_t h,
                      uint32_t tile_mode)
{
        uint32_t gob_size, bw, bh, gobs_in_block;
        uint64_t bl_size;

        BUG_ON(drm->client.device.info.family < NV_DEVICE_INFO_V0_TESLA);

        if (nouveau_check_tile_mode(tile_mode, drm->client.device.info.chipset))
                return -EINVAL;

        gobs_in_block = nouveau_get_gobs_in_block(tile_mode, drm->client.device.info.chipset);
        bw = nouveau_get_width_in_blocks(stride);
        bh = nouveau_get_height_in_blocks(h, gobs_in_block, drm->client.device.info.family);
        gob_size = nouveau_get_gob_size(drm->client.device.info.family);

        bl_size = bw * bh * gobs_in_block * gob_size;

        DRM_DEBUG_KMS("offset=%u stride=%u h=%u gobs_in_block=%u bw=%u bh=%u gob_size=%u bl_size=%llu size=%zu\n",
                      offset, stride, h, gobs_in_block, bw, bh, gob_size,
                      bl_size, nvbo->bo.base.size);

        if (bl_size + offset > nvbo->bo.base.size)
                return -ERANGE;

        return 0;
}

int
nouveau_framebuffer_new(struct drm_device *dev,
                        const struct drm_format_info *info,
                        const struct drm_mode_fb_cmd2 *mode_cmd,
                        struct drm_gem_object *gem,
                        struct drm_framebuffer **pfb)
{
        struct nouveau_drm *drm = nouveau_drm(dev);
        struct nouveau_bo *nvbo = nouveau_gem_object(gem);
        struct drm_framebuffer *fb;
        unsigned int height, i;
        uint32_t tile_mode;
        uint8_t kind;
        int ret;

        /* YUV overlays have special requirements pre-NV50 */
        if (drm->client.device.info.family < NV_DEVICE_INFO_V0_TESLA &&

            (mode_cmd->pixel_format == DRM_FORMAT_YUYV ||
             mode_cmd->pixel_format == DRM_FORMAT_UYVY ||
             mode_cmd->pixel_format == DRM_FORMAT_NV12 ||
             mode_cmd->pixel_format == DRM_FORMAT_NV21) &&
            (mode_cmd->pitches[0] & 0x3f || /* align 64 */
             mode_cmd->pitches[0] >= 0x10000 || /* at most 64k pitch */
             (mode_cmd->pitches[1] && /* pitches for planes must match */
              mode_cmd->pitches[0] != mode_cmd->pitches[1]))) {
                DRM_DEBUG_KMS("Unsuitable framebuffer: format: %p4cc; pitches: 0x%x\n 0x%x\n",
                              &mode_cmd->pixel_format,
                              mode_cmd->pitches[0], mode_cmd->pitches[1]);
                return -EINVAL;
        }

        if (mode_cmd->flags & DRM_MODE_FB_MODIFIERS) {
                if (nouveau_validate_decode_mod(drm, mode_cmd->modifier[0],
                                                &tile_mode, &kind)) {
                        DRM_DEBUG_KMS("Unsupported modifier: 0x%llx\n",
                                      mode_cmd->modifier[0]);
                        return -EINVAL;
                }
        } else {
                tile_mode = nvbo->mode;
                kind = nvbo->kind;
        }

        for (i = 0; i < info->num_planes; i++) {
                height = drm_format_info_plane_height(info,
                                                      mode_cmd->height,
                                                      i);

                if (kind) {
                        ret = nouveau_check_bl_size(drm, nvbo,
                                                    mode_cmd->offsets[i],
                                                    mode_cmd->pitches[i],
                                                    height, tile_mode);
                        if (ret)
                                return ret;
                } else {
                        uint32_t size = mode_cmd->pitches[i] * height;

                        if (size + mode_cmd->offsets[i] > nvbo->bo.base.size)
                                return -ERANGE;
                }
        }

        if (!(fb = *pfb = kzalloc_obj(*fb)))
                return -ENOMEM;

        drm_helper_mode_fill_fb_struct(dev, fb, info, mode_cmd);
        fb->obj[0] = gem;

        ret = drm_framebuffer_init(dev, fb, &nouveau_framebuffer_funcs);
        if (ret)
                kfree(fb);
        return ret;
}

struct drm_framebuffer *
nouveau_user_framebuffer_create(struct drm_device *dev,
                                struct drm_file *file_priv,
                                const struct drm_format_info *info,
                                const struct drm_mode_fb_cmd2 *mode_cmd)
{
        struct drm_framebuffer *fb;
        struct drm_gem_object *gem;
        int ret;

        gem = drm_gem_object_lookup(file_priv, mode_cmd->handles[0]);
        if (!gem)
                return ERR_PTR(-ENOENT);

        ret = nouveau_framebuffer_new(dev, info, mode_cmd, gem, &fb);
        if (ret == 0)
                return fb;

        drm_gem_object_put(gem);
        return ERR_PTR(ret);
}

static const struct drm_mode_config_funcs nouveau_mode_config_funcs = {
        .fb_create = nouveau_user_framebuffer_create,
};


struct nouveau_drm_prop_enum_list {
        u8 gen_mask;
        int type;
        char *name;
};

static struct nouveau_drm_prop_enum_list underscan[] = {
        { 6, UNDERSCAN_AUTO, "auto" },
        { 6, UNDERSCAN_OFF, "off" },
        { 6, UNDERSCAN_ON, "on" },
        {}
};

static struct nouveau_drm_prop_enum_list dither_mode[] = {
        { 7, DITHERING_MODE_AUTO, "auto" },
        { 7, DITHERING_MODE_OFF, "off" },
        { 1, DITHERING_MODE_ON, "on" },
        { 6, DITHERING_MODE_STATIC2X2, "static 2x2" },
        { 6, DITHERING_MODE_DYNAMIC2X2, "dynamic 2x2" },
        { 4, DITHERING_MODE_TEMPORAL, "temporal" },
        {}
};

static struct nouveau_drm_prop_enum_list dither_depth[] = {
        { 6, DITHERING_DEPTH_AUTO, "auto" },
        { 6, DITHERING_DEPTH_6BPC, "6 bpc" },
        { 6, DITHERING_DEPTH_8BPC, "8 bpc" },
        {}
};

#define PROP_ENUM(p,gen,n,list) do {                                           \
        struct nouveau_drm_prop_enum_list *l = (list);                         \
        int c = 0;                                                             \
        while (l->gen_mask) {                                                  \
                if (l->gen_mask & (1 << (gen)))                                \
                        c++;                                                   \
                l++;                                                           \
        }                                                                      \
        if (c) {                                                               \
                p = drm_property_create(dev, DRM_MODE_PROP_ENUM, n, c);        \
                l = (list);                                                    \
                while (p && l->gen_mask) {                                     \
                        if (l->gen_mask & (1 << (gen))) {                      \
                                drm_property_add_enum(p, l->type, l->name);    \
                        }                                                      \
                        l++;                                                   \
                }                                                              \
        }                                                                      \
} while(0)

void
nouveau_display_hpd_resume(struct nouveau_drm *drm)
{
        if (drm->headless)
                return;

        spin_lock_irq(&drm->hpd_lock);
        drm->hpd_pending = ~0;
        spin_unlock_irq(&drm->hpd_lock);

        schedule_work(&drm->hpd_work);
}

static void
nouveau_display_hpd_work(struct work_struct *work)
{
        struct nouveau_drm *drm = container_of(work, typeof(*drm), hpd_work);
        struct drm_device *dev = drm->dev;
        struct drm_connector *connector;
        struct drm_connector_list_iter conn_iter;
        u32 pending;
        int changed = 0;
        struct drm_connector *first_changed_connector = NULL;

        pm_runtime_get_sync(dev->dev);

        spin_lock_irq(&drm->hpd_lock);
        pending = drm->hpd_pending;
        drm->hpd_pending = 0;
        spin_unlock_irq(&drm->hpd_lock);

        /* Nothing to do, exit early without updating the last busy counter */
        if (!pending)
                goto noop;

        mutex_lock(&dev->mode_config.mutex);
        drm_connector_list_iter_begin(dev, &conn_iter);

        nouveau_for_each_non_mst_connector_iter(connector, &conn_iter) {
                struct nouveau_connector *nv_connector = nouveau_connector(connector);
                enum drm_connector_status old_status = connector->status;
                u64 bits, old_epoch_counter = connector->epoch_counter;

                if (!(pending & drm_connector_mask(connector)))
                        continue;

                spin_lock_irq(&drm->hpd_lock);
                bits = nv_connector->hpd_pending;
                nv_connector->hpd_pending = 0;
                spin_unlock_irq(&drm->hpd_lock);

                drm_dbg_kms(dev, "[CONNECTOR:%d:%s] plug:%d unplug:%d irq:%d\n",
                            connector->base.id, connector->name,
                            !!(bits & NVIF_CONN_EVENT_V0_PLUG),
                            !!(bits & NVIF_CONN_EVENT_V0_UNPLUG),
                            !!(bits & NVIF_CONN_EVENT_V0_IRQ));

                if (bits & NVIF_CONN_EVENT_V0_IRQ) {
                        if (nouveau_dp_link_check(nv_connector))
                                continue;
                }

                connector->status = drm_helper_probe_detect(connector, NULL, false);
                if (old_epoch_counter == connector->epoch_counter)
                        continue;

                changed++;
                if (!first_changed_connector) {
                        drm_connector_get(connector);
                        first_changed_connector = connector;
                }

                drm_dbg_kms(dev, "[CONNECTOR:%d:%s] status updated from %s to %s (epoch counter %llu->%llu)\n",
                            connector->base.id, connector->name,
                            drm_get_connector_status_name(old_status),
                            drm_get_connector_status_name(connector->status),
                            old_epoch_counter, connector->epoch_counter);
        }

        drm_connector_list_iter_end(&conn_iter);
        mutex_unlock(&dev->mode_config.mutex);

        if (changed == 1)
                drm_kms_helper_connector_hotplug_event(first_changed_connector);
        else if (changed > 0)
                drm_kms_helper_hotplug_event(dev);

        if (first_changed_connector)
                drm_connector_put(first_changed_connector);

        pm_runtime_mark_last_busy(dev->dev);
noop:
        pm_runtime_put_autosuspend(dev->dev);
}

#ifdef CONFIG_ACPI

static int
nouveau_display_acpi_ntfy(struct notifier_block *nb, unsigned long val,
                          void *data)
{
        struct nouveau_drm *drm = container_of(nb, typeof(*drm), acpi_nb);
        struct acpi_bus_event *info = data;
        int ret;

        if (!strcmp(info->device_class, ACPI_VIDEO_CLASS)) {
                if (info->type == ACPI_VIDEO_NOTIFY_PROBE) {
                        ret = pm_runtime_get(drm->dev->dev);
                        if (ret == 1 || ret == -EACCES) {
                                /* If the GPU is already awake, or in a state
                                 * where we can't wake it up, it can handle
                                 * it's own hotplug events.
                                 */
                                pm_runtime_put_autosuspend(drm->dev->dev);
                        } else if (ret == 0 || ret == -EINPROGRESS) {
                                /* We've started resuming the GPU already, so
                                 * it will handle scheduling a full reprobe
                                 * itself
                                 */
                                NV_DEBUG(drm, "ACPI requested connector reprobe\n");
                                pm_runtime_put_noidle(drm->dev->dev);
                        } else {
                                NV_WARN(drm, "Dropped ACPI reprobe event due to RPM error: %d\n",
                                        ret);
                        }

                        /* acpi-video should not generate keypresses for this */
                        return NOTIFY_BAD;
                }
        }

        return NOTIFY_DONE;
}
#endif

int
nouveau_display_init(struct drm_device *dev, bool resume, bool runtime)
{
        struct nouveau_display *disp = nouveau_display(dev);
        struct drm_connector *connector;
        struct drm_connector_list_iter conn_iter;
        int ret;

        /*
         * Enable hotplug interrupts (done as early as possible, since we need
         * them for MST)
         */
        drm_connector_list_iter_begin(dev, &conn_iter);
        nouveau_for_each_non_mst_connector_iter(connector, &conn_iter) {
                struct nouveau_connector *conn = nouveau_connector(connector);
                nvif_event_allow(&conn->hpd);
                nvif_event_allow(&conn->irq);
        }
        drm_connector_list_iter_end(&conn_iter);

        ret = disp->init(dev, resume, runtime);
        if (ret)
                return ret;

        /* enable connector detection and polling for connectors without HPD
         * support
         */
        drm_kms_helper_poll_enable(dev);

        return ret;
}

void
nouveau_display_fini(struct drm_device *dev, bool suspend, bool runtime)
{
        struct nouveau_display *disp = nouveau_display(dev);
        struct nouveau_drm *drm = nouveau_drm(dev);
        struct drm_connector *connector;
        struct drm_connector_list_iter conn_iter;

        if (!suspend) {
                if (drm_drv_uses_atomic_modeset(dev))
                        drm_atomic_helper_shutdown(dev);
                else
                        drm_helper_force_disable_all(dev);
        }

        /* disable hotplug interrupts */
        drm_connector_list_iter_begin(dev, &conn_iter);
        nouveau_for_each_non_mst_connector_iter(connector, &conn_iter) {
                struct nouveau_connector *conn = nouveau_connector(connector);
                nvif_event_block(&conn->irq);
                nvif_event_block(&conn->hpd);
        }
        drm_connector_list_iter_end(&conn_iter);

        if (!runtime && !drm->headless)
                cancel_work_sync(&drm->hpd_work);

        drm_kms_helper_poll_disable(dev);
        disp->fini(dev, runtime, suspend);
}

static void
nouveau_display_create_properties(struct drm_device *dev)
{
        struct nouveau_display *disp = nouveau_display(dev);
        int gen;

        if (disp->disp.object.oclass < NV50_DISP)
                gen = 0;
        else
        if (disp->disp.object.oclass < GF110_DISP)
                gen = 1;
        else
                gen = 2;

        PROP_ENUM(disp->dithering_mode, gen, "dithering mode", dither_mode);
        PROP_ENUM(disp->dithering_depth, gen, "dithering depth", dither_depth);
        PROP_ENUM(disp->underscan_property, gen, "underscan", underscan);

        disp->underscan_hborder_property =
                drm_property_create_range(dev, 0, "underscan hborder", 0, 128);

        disp->underscan_vborder_property =
                drm_property_create_range(dev, 0, "underscan vborder", 0, 128);

        if (gen < 1)
                return;

        /* -90..+90 */
        disp->vibrant_hue_property =
                drm_property_create_range(dev, 0, "vibrant hue", 0, 180);

        /* -100..+100 */
        disp->color_vibrance_property =
                drm_property_create_range(dev, 0, "color vibrance", 0, 200);
}

int
nouveau_display_create(struct drm_device *dev)
{
        struct nouveau_drm *drm = nouveau_drm(dev);
        struct nouveau_display *disp;
        int ret;

        disp = drm->display = kzalloc_obj(*disp);
        if (!disp)
                return -ENOMEM;

        drm_mode_config_init(dev);
        drm_mode_create_scaling_mode_property(dev);
        drm_mode_create_dvi_i_properties(dev);

        dev->mode_config.funcs = &nouveau_mode_config_funcs;

        dev->mode_config.min_width = 0;
        dev->mode_config.min_height = 0;
        if (drm->client.device.info.family < NV_DEVICE_INFO_V0_CELSIUS) {
                dev->mode_config.max_width = 2048;
                dev->mode_config.max_height = 2048;
        } else
        if (drm->client.device.info.family < NV_DEVICE_INFO_V0_TESLA) {
                dev->mode_config.max_width = 4096;
                dev->mode_config.max_height = 4096;
        } else
        if (drm->client.device.info.family < NV_DEVICE_INFO_V0_FERMI) {
                dev->mode_config.max_width = 8192;
                dev->mode_config.max_height = 8192;
        } else {
                dev->mode_config.max_width = 16384;
                dev->mode_config.max_height = 16384;
        }

        dev->mode_config.preferred_depth = 24;
        dev->mode_config.prefer_shadow = 1;

        if (drm->client.device.info.chipset < 0x11)
                dev->mode_config.async_page_flip = false;
        else
                dev->mode_config.async_page_flip = true;

        drm_kms_helper_poll_init(dev);
        drm_kms_helper_poll_disable(dev);

        if (nouveau_modeset != 2) {
                ret = nvif_disp_ctor(&drm->client.device, "kmsDisp", 0, &disp->disp);
                /* no display hw */
                if (ret == -ENODEV) {
                        ret = 0;
                        drm->headless = true;
                        goto disp_create_err;
                }

                if (!ret && (disp->disp.outp_mask || drm->vbios.dcb.entries)) {
                        nouveau_display_create_properties(dev);
                        if (disp->disp.object.oclass < NV50_DISP) {
                                dev->mode_config.fb_modifiers_not_supported = true;
                                ret = nv04_display_create(dev);
                        } else {
                                ret = nv50_display_create(dev);
                        }
                }
        } else {
                ret = 0;
        }

        if (ret)
                goto disp_create_err;

        drm_mode_config_reset(dev);

        if (dev->mode_config.num_crtc) {
                ret = drm_vblank_init(dev, dev->mode_config.num_crtc);
                if (ret)
                        goto vblank_err;

                if (disp->disp.object.oclass >= NV50_DISP)
                        nv50_crc_init(dev);
        }

        INIT_WORK(&drm->hpd_work, nouveau_display_hpd_work);
        spin_lock_init(&drm->hpd_lock);
#ifdef CONFIG_ACPI
        drm->acpi_nb.notifier_call = nouveau_display_acpi_ntfy;
        register_acpi_notifier(&drm->acpi_nb);
#endif

        return 0;

vblank_err:
        disp->dtor(dev);
disp_create_err:
        drm_kms_helper_poll_fini(dev);
        drm_mode_config_cleanup(dev);
        return ret;
}

void
nouveau_display_destroy(struct drm_device *dev)
{
        struct nouveau_display *disp = nouveau_display(dev);
        struct nouveau_drm *drm = nouveau_drm(dev);

#ifdef CONFIG_ACPI
        unregister_acpi_notifier(&drm->acpi_nb);
#endif

        drm_kms_helper_poll_fini(dev);
        drm_mode_config_cleanup(dev);

        if (disp->dtor)
                disp->dtor(dev);

        nvif_disp_dtor(&disp->disp);

        drm->display = NULL;
        kfree(disp);
}

int
nouveau_display_suspend(struct drm_device *dev, bool runtime)
{
        struct nouveau_display *disp = nouveau_display(dev);

        drm_client_dev_suspend(dev);

        if (drm_drv_uses_atomic_modeset(dev)) {
                if (!runtime) {
                        disp->suspend = drm_atomic_helper_suspend(dev);
                        if (IS_ERR(disp->suspend)) {
                                int ret = PTR_ERR(disp->suspend);
                                disp->suspend = NULL;
                                return ret;
                        }
                }
        }

        nouveau_display_fini(dev, true, runtime);
        return 0;
}

void
nouveau_display_resume(struct drm_device *dev, bool runtime)
{
        struct nouveau_display *disp = nouveau_display(dev);

        nouveau_display_init(dev, true, runtime);

        if (drm_drv_uses_atomic_modeset(dev)) {
                if (disp->suspend) {
                        drm_atomic_helper_resume(dev, disp->suspend);
                        disp->suspend = NULL;
                }
        }

        drm_client_dev_resume(dev);
}

int
nouveau_display_dumb_create(struct drm_file *file_priv, struct drm_device *dev,
                            struct drm_mode_create_dumb *args)
{
        struct nouveau_cli *cli = nouveau_cli(file_priv);
        struct nouveau_bo *bo;
        uint32_t domain;
        int ret;

        ret = drm_mode_size_dumb(dev, args, SZ_256, 0);
        if (ret)
                return ret;

        /* Use VRAM if there is any ; otherwise fallback to system memory */
        if (nouveau_drm(dev)->client.device.info.ram_size != 0)
                domain = NOUVEAU_GEM_DOMAIN_VRAM;
        else
                domain = NOUVEAU_GEM_DOMAIN_GART;

        ret = nouveau_gem_new(cli, args->size, 0, domain, 0, 0, &bo);
        if (ret)
                return ret;

        ret = drm_gem_handle_create(file_priv, &bo->bo.base, &args->handle);
        drm_gem_object_put(&bo->bo.base);
        return ret;
}