/*
 * Copyright © 2011 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:
 *   Jesse Barnes <jbarnes@virtuousgeek.org>
 *
 * New plane/sprite handling.
 *
 * The older chips had a separate interface for programming plane related
 * registers; newer ones are much simpler and we can use the new DRM plane
 * support.
 */
#include <drm/drmP.h>
#include <drm/drm_crtc.h>
#include <drm/drm_fourcc.h>
#include <drm/drm_rect.h>
#include "intel_drv.h"
#include <drm/i915_drm.h>
#include "i915_drv.h"

static bool
format_is_yuv(uint32_t format)
{
        switch (format) {
        case DRM_FORMAT_YUYV:
        case DRM_FORMAT_UYVY:
        case DRM_FORMAT_VYUY:
        case DRM_FORMAT_YVYU:
                return true;
        default:
                return false;
        }
}

static int usecs_to_scanlines(const struct drm_display_mode *mode, int usecs)
{
        /* paranoia */
        if (!mode->crtc_htotal)
                return 1;

        return DIV_ROUND_UP(usecs * mode->crtc_clock, 1000 * mode->crtc_htotal);
}

/**
 * intel_pipe_update_start() - start update of a set of display registers
 * @crtc: the crtc of which the registers are going to be updated
 * @start_vbl_count: vblank counter return pointer used for error checking
 *
 * Mark the start of an update to pipe registers that should be updated
 * atomically regarding vblank. If the next vblank will happens within
 * the next 100 us, this function waits until the vblank passes.
 *
 * After a successful call to this function, interrupts will be disabled
 * until a subsequent call to intel_pipe_update_end(). That is done to
 * avoid random delays. The value written to @start_vbl_count should be
 * supplied to intel_pipe_update_end() for error checking.
 *
 * Return: true if the call was successful
 */
bool intel_pipe_update_start(struct intel_crtc *crtc, uint32_t *start_vbl_count)
{
        struct drm_device *dev = crtc->base.dev;
        const struct drm_display_mode *mode = &crtc->config.adjusted_mode;
        enum pipe pipe = crtc->pipe;
        long timeout = msecs_to_jiffies_timeout(1);
        int scanline, min, max, vblank_start;
        wait_queue_head_t *wq = drm_crtc_vblank_waitqueue(&crtc->base);
        DEFINE_WAIT(wait);

        vblank_start = mode->crtc_vblank_start;
        if (mode->flags & DRM_MODE_FLAG_INTERLACE)
                vblank_start = DIV_ROUND_UP(vblank_start, 2);

        /* FIXME needs to be calibrated sensibly */
        min = vblank_start - usecs_to_scanlines(mode, 100);
        max = vblank_start - 1;

        if (min <= 0 || max <= 0)
                return false;

        if (WARN_ON(drm_vblank_get(dev, pipe)))
                return false;

        local_irq_disable();

        trace_i915_pipe_update_start(crtc, min, max);

        for (;;) {
                /*
                 * prepare_to_wait() has a memory barrier, which guarantees
                 * other CPUs can see the task state update by the time we
                 * read the scanline.
                 */
                prepare_to_wait(wq, &wait, TASK_UNINTERRUPTIBLE);

                scanline = intel_get_crtc_scanline(crtc);
                if (scanline < min || scanline > max)
                        break;

                if (timeout <= 0) {
                        DRM_ERROR("Potential atomic update failure on pipe %c\n",
                                  pipe_name(crtc->pipe));
                        break;
                }

                local_irq_enable();

                timeout = schedule_timeout(timeout);

                local_irq_disable();
        }

        finish_wait(wq, &wait);

        drm_vblank_put(dev, pipe);

        *start_vbl_count = dev->driver->get_vblank_counter(dev, pipe);

        trace_i915_pipe_update_vblank_evaded(crtc, min, max, *start_vbl_count);

        return true;
}

/**
 * intel_pipe_update_end() - end update of a set of display registers
 * @crtc: the crtc of which the registers were updated
 * @start_vbl_count: start vblank counter (used for error checking)
 *
 * Mark the end of an update started with intel_pipe_update_start(). This
 * re-enables interrupts and verifies the update was actually completed
 * before a vblank using the value of @start_vbl_count.
 */
void intel_pipe_update_end(struct intel_crtc *crtc, u32 start_vbl_count)
{
        struct drm_device *dev = crtc->base.dev;
        enum pipe pipe = crtc->pipe;
        u32 end_vbl_count = dev->driver->get_vblank_counter(dev, pipe);

        trace_i915_pipe_update_end(crtc, end_vbl_count);

        local_irq_enable();

        if (start_vbl_count != end_vbl_count)
                DRM_ERROR("Atomic update failure on pipe %c (start=%u end=%u)\n",
                          pipe_name(pipe), start_vbl_count, end_vbl_count);
}

static void intel_update_primary_plane(struct intel_crtc *crtc)
{
        struct drm_i915_private *dev_priv = crtc->base.dev->dev_private;
        int reg = DSPCNTR(crtc->plane);

        if (crtc->primary_enabled)
                I915_WRITE(reg, I915_READ(reg) | DISPLAY_PLANE_ENABLE);
        else
                I915_WRITE(reg, I915_READ(reg) & ~DISPLAY_PLANE_ENABLE);
}

static void
skl_update_plane(struct drm_plane *drm_plane, struct drm_crtc *crtc,
                 struct drm_framebuffer *fb,
                 struct drm_i915_gem_object *obj, int crtc_x, int crtc_y,
                 unsigned int crtc_w, unsigned int crtc_h,
                 uint32_t x, uint32_t y,
                 uint32_t src_w, uint32_t src_h)
{
        struct drm_device *dev = drm_plane->dev;
        struct drm_i915_private *dev_priv = dev->dev_private;
        struct intel_plane *intel_plane = to_intel_plane(drm_plane);
        const int pipe = intel_plane->pipe;
        const int plane = intel_plane->plane + 1;
        u32 plane_ctl, stride;
        int pixel_size = drm_format_plane_cpp(fb->pixel_format, 0);

        plane_ctl = I915_READ(PLANE_CTL(pipe, plane));

        /* Mask out pixel format bits in case we change it */
        plane_ctl &= ~PLANE_CTL_FORMAT_MASK;
        plane_ctl &= ~PLANE_CTL_ORDER_RGBX;
        plane_ctl &= ~PLANE_CTL_YUV422_ORDER_MASK;
        plane_ctl &= ~PLANE_CTL_TILED_MASK;
        plane_ctl &= ~PLANE_CTL_ALPHA_MASK;
        plane_ctl &= ~PLANE_CTL_ROTATE_MASK;

        /* Trickle feed has to be enabled */
        plane_ctl &= ~PLANE_CTL_TRICKLE_FEED_DISABLE;

        switch (fb->pixel_format) {
        case DRM_FORMAT_RGB565:
                plane_ctl |= PLANE_CTL_FORMAT_RGB_565;
                break;
        case DRM_FORMAT_XBGR8888:
                plane_ctl |= PLANE_CTL_FORMAT_XRGB_8888 | PLANE_CTL_ORDER_RGBX;
                break;
        case DRM_FORMAT_XRGB8888:
                plane_ctl |= PLANE_CTL_FORMAT_XRGB_8888;
                break;
        /*
         * 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.
         */
        case DRM_FORMAT_ABGR8888:
                plane_ctl |= PLANE_CTL_FORMAT_XRGB_8888 |
                             PLANE_CTL_ORDER_RGBX |
                             PLANE_CTL_ALPHA_SW_PREMULTIPLY;
                break;
        case DRM_FORMAT_ARGB8888:
                plane_ctl |= PLANE_CTL_FORMAT_XRGB_8888 |
                             PLANE_CTL_ALPHA_SW_PREMULTIPLY;
                break;
        case DRM_FORMAT_YUYV:
                plane_ctl |= PLANE_CTL_FORMAT_YUV422 | PLANE_CTL_YUV422_YUYV;
                break;
        case DRM_FORMAT_YVYU:
                plane_ctl |= PLANE_CTL_FORMAT_YUV422 | PLANE_CTL_YUV422_YVYU;
                break;
        case DRM_FORMAT_UYVY:
                plane_ctl |= PLANE_CTL_FORMAT_YUV422 | PLANE_CTL_YUV422_UYVY;
                break;
        case DRM_FORMAT_VYUY:
                plane_ctl |= PLANE_CTL_FORMAT_YUV422 | PLANE_CTL_YUV422_VYUY;
                break;
        default:
                BUG();
        }

        switch (obj->tiling_mode) {
        case I915_TILING_NONE:
                stride = fb->pitches[0] >> 6;
                break;
        case I915_TILING_X:
                plane_ctl |= PLANE_CTL_TILED_X;
                stride = fb->pitches[0] >> 9;
                break;
        default:
                BUG();
        }
        if (intel_plane->rotation == BIT(DRM_ROTATE_180))
                plane_ctl |= PLANE_CTL_ROTATE_180;

        plane_ctl |= PLANE_CTL_ENABLE;
        plane_ctl |= PLANE_CTL_PIPE_CSC_ENABLE;

        intel_update_sprite_watermarks(drm_plane, crtc, src_w, src_h,
                                       pixel_size, true,
                                       src_w != crtc_w || src_h != crtc_h);

        /* Sizes are 0 based */
        src_w--;
        src_h--;
        crtc_w--;
        crtc_h--;

        I915_WRITE(PLANE_OFFSET(pipe, plane), (y << 16) | x);
        I915_WRITE(PLANE_STRIDE(pipe, plane), stride);
        I915_WRITE(PLANE_POS(pipe, plane), (crtc_y << 16) | crtc_x);
        I915_WRITE(PLANE_SIZE(pipe, plane), (crtc_h << 16) | crtc_w);
        I915_WRITE(PLANE_CTL(pipe, plane), plane_ctl);
        I915_WRITE(PLANE_SURF(pipe, plane), i915_gem_obj_ggtt_offset(obj));
        POSTING_READ(PLANE_SURF(pipe, plane));
}

static void
skl_disable_plane(struct drm_plane *drm_plane, struct drm_crtc *crtc)
{
        struct drm_device *dev = drm_plane->dev;
        struct drm_i915_private *dev_priv = dev->dev_private;
        struct intel_plane *intel_plane = to_intel_plane(drm_plane);
        const int pipe = intel_plane->pipe;
        const int plane = intel_plane->plane + 1;

        I915_WRITE(PLANE_CTL(pipe, plane),
                   I915_READ(PLANE_CTL(pipe, plane)) & ~PLANE_CTL_ENABLE);

        /* Activate double buffered register update */
        I915_WRITE(PLANE_CTL(pipe, plane), 0);
        POSTING_READ(PLANE_CTL(pipe, plane));

        intel_update_sprite_watermarks(drm_plane, crtc, 0, 0, 0, false, false);
}

static int
skl_update_colorkey(struct drm_plane *drm_plane,
                    struct drm_intel_sprite_colorkey *key)
{
        struct drm_device *dev = drm_plane->dev;
        struct drm_i915_private *dev_priv = dev->dev_private;
        struct intel_plane *intel_plane = to_intel_plane(drm_plane);
        const int pipe = intel_plane->pipe;
        const int plane = intel_plane->plane;
        u32 plane_ctl;

        I915_WRITE(PLANE_KEYVAL(pipe, plane), key->min_value);
        I915_WRITE(PLANE_KEYMAX(pipe, plane), key->max_value);
        I915_WRITE(PLANE_KEYMSK(pipe, plane), key->channel_mask);

        plane_ctl = I915_READ(PLANE_CTL(pipe, plane));
        plane_ctl &= ~PLANE_CTL_KEY_ENABLE_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;
        I915_WRITE(PLANE_CTL(pipe, plane), plane_ctl);

        POSTING_READ(PLANE_CTL(pipe, plane));

        return 0;
}

static void
skl_get_colorkey(struct drm_plane *drm_plane,
                 struct drm_intel_sprite_colorkey *key)
{
        struct drm_device *dev = drm_plane->dev;
        struct drm_i915_private *dev_priv = dev->dev_private;
        struct intel_plane *intel_plane = to_intel_plane(drm_plane);
        const int pipe = intel_plane->pipe;
        const int plane = intel_plane->plane;
        u32 plane_ctl;

        key->min_value = I915_READ(PLANE_KEYVAL(pipe, plane));
        key->max_value = I915_READ(PLANE_KEYMAX(pipe, plane));
        key->channel_mask = I915_READ(PLANE_KEYMSK(pipe, plane));

        plane_ctl = I915_READ(PLANE_CTL(pipe, plane));

        switch (plane_ctl & PLANE_CTL_KEY_ENABLE_MASK) {
        case PLANE_CTL_KEY_ENABLE_DESTINATION:
                key->flags = I915_SET_COLORKEY_DESTINATION;
                break;
        case PLANE_CTL_KEY_ENABLE_SOURCE:
                key->flags = I915_SET_COLORKEY_SOURCE;
                break;
        default:
                key->flags = I915_SET_COLORKEY_NONE;
        }
}

static void
chv_update_csc(struct intel_plane *intel_plane, uint32_t format)
{
        struct drm_i915_private *dev_priv = intel_plane->base.dev->dev_private;
        int plane = intel_plane->plane;

        /* Seems RGB data bypasses the CSC always */
        if (!format_is_yuv(format))
                return;

        /*
         * BT.601 limited range YCbCr -> full range RGB
         *
         * |r|   | 6537 4769     0|   |cr  |
         * |g| = |-3330 4769 -1605| x |y-64|
         * |b|   |    0 4769  8263|   |cb  |
         *
         * Cb and Cr apparently come in as signed already, so no
         * need for any offset. For Y we need to remove the offset.
         */
        I915_WRITE(SPCSCYGOFF(plane), SPCSC_OOFF(0) | SPCSC_IOFF(-64));
        I915_WRITE(SPCSCCBOFF(plane), SPCSC_OOFF(0) | SPCSC_IOFF(0));
        I915_WRITE(SPCSCCROFF(plane), SPCSC_OOFF(0) | SPCSC_IOFF(0));

        I915_WRITE(SPCSCC01(plane), SPCSC_C1(4769) | SPCSC_C0(6537));
        I915_WRITE(SPCSCC23(plane), SPCSC_C1(-3330) | SPCSC_C0(0));
        I915_WRITE(SPCSCC45(plane), SPCSC_C1(-1605) | SPCSC_C0(4769));
        I915_WRITE(SPCSCC67(plane), SPCSC_C1(4769) | SPCSC_C0(0));
        I915_WRITE(SPCSCC8(plane), SPCSC_C0(8263));

        I915_WRITE(SPCSCYGICLAMP(plane), SPCSC_IMAX(940) | SPCSC_IMIN(64));
        I915_WRITE(SPCSCCBICLAMP(plane), SPCSC_IMAX(448) | SPCSC_IMIN(-448));
        I915_WRITE(SPCSCCRICLAMP(plane), SPCSC_IMAX(448) | SPCSC_IMIN(-448));

        I915_WRITE(SPCSCYGOCLAMP(plane), SPCSC_OMAX(1023) | SPCSC_OMIN(0));
        I915_WRITE(SPCSCCBOCLAMP(plane), SPCSC_OMAX(1023) | SPCSC_OMIN(0));
        I915_WRITE(SPCSCCROCLAMP(plane), SPCSC_OMAX(1023) | SPCSC_OMIN(0));
}

static void
vlv_update_plane(struct drm_plane *dplane, struct drm_crtc *crtc,
                 struct drm_framebuffer *fb,
                 struct drm_i915_gem_object *obj, int crtc_x, int crtc_y,
                 unsigned int crtc_w, unsigned int crtc_h,
                 uint32_t x, uint32_t y,
                 uint32_t src_w, uint32_t src_h)
{
        struct drm_device *dev = dplane->dev;
        struct drm_i915_private *dev_priv = dev->dev_private;
        struct intel_plane *intel_plane = to_intel_plane(dplane);
        struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
        int pipe = intel_plane->pipe;
        int plane = intel_plane->plane;
        u32 sprctl;
        unsigned long sprsurf_offset, linear_offset;
        int pixel_size = drm_format_plane_cpp(fb->pixel_format, 0);
        u32 start_vbl_count;
        bool atomic_update;

        sprctl = I915_READ(SPCNTR(pipe, plane));

        /* Mask out pixel format bits in case we change it */
        sprctl &= ~SP_PIXFORMAT_MASK;
        sprctl &= ~SP_YUV_BYTE_ORDER_MASK;
        sprctl &= ~SP_TILED;
        sprctl &= ~SP_ROTATE_180;

        switch (fb->pixel_format) {
        case DRM_FORMAT_YUYV:
                sprctl |= SP_FORMAT_YUV422 | SP_YUV_ORDER_YUYV;
                break;
        case DRM_FORMAT_YVYU:
                sprctl |= SP_FORMAT_YUV422 | SP_YUV_ORDER_YVYU;
                break;
        case DRM_FORMAT_UYVY:
                sprctl |= SP_FORMAT_YUV422 | SP_YUV_ORDER_UYVY;
                break;
        case DRM_FORMAT_VYUY:
                sprctl |= SP_FORMAT_YUV422 | SP_YUV_ORDER_VYUY;
                break;
        case DRM_FORMAT_RGB565:
                sprctl |= SP_FORMAT_BGR565;
                break;
        case DRM_FORMAT_XRGB8888:
                sprctl |= SP_FORMAT_BGRX8888;
                break;
        case DRM_FORMAT_ARGB8888:
                sprctl |= SP_FORMAT_BGRA8888;
                break;
        case DRM_FORMAT_XBGR2101010:
                sprctl |= SP_FORMAT_RGBX1010102;
                break;
        case DRM_FORMAT_ABGR2101010:
                sprctl |= SP_FORMAT_RGBA1010102;
                break;
        case DRM_FORMAT_XBGR8888:
                sprctl |= SP_FORMAT_RGBX8888;
                break;
        case DRM_FORMAT_ABGR8888:
                sprctl |= SP_FORMAT_RGBA8888;
                break;
        default:
                /*
                 * If we get here one of the upper layers failed to filter
                 * out the unsupported plane formats
                 */
                BUG();
                break;
        }

        /*
         * Enable gamma to match primary/cursor plane behaviour.
         * FIXME should be user controllable via propertiesa.
         */
        sprctl |= SP_GAMMA_ENABLE;

        if (obj->tiling_mode != I915_TILING_NONE)
                sprctl |= SP_TILED;

        sprctl |= SP_ENABLE;

        intel_update_sprite_watermarks(dplane, crtc, src_w, src_h,
                                       pixel_size, true,
                                       src_w != crtc_w || src_h != crtc_h);

        /* Sizes are 0 based */
        src_w--;
        src_h--;
        crtc_w--;
        crtc_h--;

        linear_offset = y * fb->pitches[0] + x * pixel_size;
        sprsurf_offset = intel_gen4_compute_page_offset(&x, &y,
                                                        obj->tiling_mode,
                                                        pixel_size,
                                                        fb->pitches[0]);
        linear_offset -= sprsurf_offset;

        if (intel_plane->rotation == BIT(DRM_ROTATE_180)) {
                sprctl |= SP_ROTATE_180;

                x += src_w;
                y += src_h;
                linear_offset += src_h * fb->pitches[0] + src_w * pixel_size;
        }

        atomic_update = intel_pipe_update_start(intel_crtc, &start_vbl_count);

        intel_update_primary_plane(intel_crtc);

        if (IS_CHERRYVIEW(dev) && pipe == PIPE_B)
                chv_update_csc(intel_plane, fb->pixel_format);

        I915_WRITE(SPSTRIDE(pipe, plane), fb->pitches[0]);
        I915_WRITE(SPPOS(pipe, plane), (crtc_y << 16) | crtc_x);

        if (obj->tiling_mode != I915_TILING_NONE)
                I915_WRITE(SPTILEOFF(pipe, plane), (y << 16) | x);
        else
                I915_WRITE(SPLINOFF(pipe, plane), linear_offset);

        I915_WRITE(SPCONSTALPHA(pipe, plane), 0);

        I915_WRITE(SPSIZE(pipe, plane), (crtc_h << 16) | crtc_w);
        I915_WRITE(SPCNTR(pipe, plane), sprctl);
        I915_WRITE(SPSURF(pipe, plane), i915_gem_obj_ggtt_offset(obj) +
                   sprsurf_offset);

        intel_flush_primary_plane(dev_priv, intel_crtc->plane);

        if (atomic_update)
                intel_pipe_update_end(intel_crtc, start_vbl_count);
}

static void
vlv_disable_plane(struct drm_plane *dplane, struct drm_crtc *crtc)
{
        struct drm_device *dev = dplane->dev;
        struct drm_i915_private *dev_priv = dev->dev_private;
        struct intel_plane *intel_plane = to_intel_plane(dplane);
        struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
        int pipe = intel_plane->pipe;
        int plane = intel_plane->plane;
        u32 start_vbl_count;
        bool atomic_update;

        atomic_update = intel_pipe_update_start(intel_crtc, &start_vbl_count);

        intel_update_primary_plane(intel_crtc);

        I915_WRITE(SPCNTR(pipe, plane), I915_READ(SPCNTR(pipe, plane)) &
                   ~SP_ENABLE);
        /* Activate double buffered register update */
        I915_WRITE(SPSURF(pipe, plane), 0);

        intel_flush_primary_plane(dev_priv, intel_crtc->plane);

        if (atomic_update)
                intel_pipe_update_end(intel_crtc, start_vbl_count);

        intel_update_sprite_watermarks(dplane, crtc, 0, 0, 0, false, false);
}

static int
vlv_update_colorkey(struct drm_plane *dplane,
                    struct drm_intel_sprite_colorkey *key)
{
        struct drm_device *dev = dplane->dev;
        struct drm_i915_private *dev_priv = dev->dev_private;
        struct intel_plane *intel_plane = to_intel_plane(dplane);
        int pipe = intel_plane->pipe;
        int plane = intel_plane->plane;
        u32 sprctl;

        if (key->flags & I915_SET_COLORKEY_DESTINATION)
                return -EINVAL;

        I915_WRITE(SPKEYMINVAL(pipe, plane), key->min_value);
        I915_WRITE(SPKEYMAXVAL(pipe, plane), key->max_value);
        I915_WRITE(SPKEYMSK(pipe, plane), key->channel_mask);

        sprctl = I915_READ(SPCNTR(pipe, plane));
        sprctl &= ~SP_SOURCE_KEY;
        if (key->flags & I915_SET_COLORKEY_SOURCE)
                sprctl |= SP_SOURCE_KEY;
        I915_WRITE(SPCNTR(pipe, plane), sprctl);

        POSTING_READ(SPKEYMSK(pipe, plane));

        return 0;
}

static void
vlv_get_colorkey(struct drm_plane *dplane,
                 struct drm_intel_sprite_colorkey *key)
{
        struct drm_device *dev = dplane->dev;
        struct drm_i915_private *dev_priv = dev->dev_private;
        struct intel_plane *intel_plane = to_intel_plane(dplane);
        int pipe = intel_plane->pipe;
        int plane = intel_plane->plane;
        u32 sprctl;

        key->min_value = I915_READ(SPKEYMINVAL(pipe, plane));
        key->max_value = I915_READ(SPKEYMAXVAL(pipe, plane));
        key->channel_mask = I915_READ(SPKEYMSK(pipe, plane));

        sprctl = I915_READ(SPCNTR(pipe, plane));
        if (sprctl & SP_SOURCE_KEY)
                key->flags = I915_SET_COLORKEY_SOURCE;
        else
                key->flags = I915_SET_COLORKEY_NONE;
}

static void
ivb_update_plane(struct drm_plane *plane, struct drm_crtc *crtc,
                 struct drm_framebuffer *fb,
                 struct drm_i915_gem_object *obj, int crtc_x, int crtc_y,
                 unsigned int crtc_w, unsigned int crtc_h,
                 uint32_t x, uint32_t y,
                 uint32_t src_w, uint32_t src_h)
{
        struct drm_device *dev = plane->dev;
        struct drm_i915_private *dev_priv = dev->dev_private;
        struct intel_plane *intel_plane = to_intel_plane(plane);
        struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
        int pipe = intel_plane->pipe;
        u32 sprctl, sprscale = 0;
        unsigned long sprsurf_offset, linear_offset;
        int pixel_size = drm_format_plane_cpp(fb->pixel_format, 0);
        u32 start_vbl_count;
        bool atomic_update;

        sprctl = I915_READ(SPRCTL(pipe));

        /* Mask out pixel format bits in case we change it */
        sprctl &= ~SPRITE_PIXFORMAT_MASK;
        sprctl &= ~SPRITE_RGB_ORDER_RGBX;
        sprctl &= ~SPRITE_YUV_BYTE_ORDER_MASK;
        sprctl &= ~SPRITE_TILED;
        sprctl &= ~SPRITE_ROTATE_180;

        switch (fb->pixel_format) {
        case DRM_FORMAT_XBGR8888:
                sprctl |= SPRITE_FORMAT_RGBX888 | SPRITE_RGB_ORDER_RGBX;
                break;
        case DRM_FORMAT_XRGB8888:
                sprctl |= SPRITE_FORMAT_RGBX888;
                break;
        case DRM_FORMAT_YUYV:
                sprctl |= SPRITE_FORMAT_YUV422 | SPRITE_YUV_ORDER_YUYV;
                break;
        case DRM_FORMAT_YVYU:
                sprctl |= SPRITE_FORMAT_YUV422 | SPRITE_YUV_ORDER_YVYU;
                break;
        case DRM_FORMAT_UYVY:
                sprctl |= SPRITE_FORMAT_YUV422 | SPRITE_YUV_ORDER_UYVY;
                break;
        case DRM_FORMAT_VYUY:
                sprctl |= SPRITE_FORMAT_YUV422 | SPRITE_YUV_ORDER_VYUY;
                break;
        default:
                BUG();
        }

        /*
         * Enable gamma to match primary/cursor plane behaviour.
         * FIXME should be user controllable via propertiesa.
         */
        sprctl |= SPRITE_GAMMA_ENABLE;

        if (obj->tiling_mode != I915_TILING_NONE)
                sprctl |= SPRITE_TILED;

        if (IS_HASWELL(dev) || IS_BROADWELL(dev))
                sprctl &= ~SPRITE_TRICKLE_FEED_DISABLE;
        else
                sprctl |= SPRITE_TRICKLE_FEED_DISABLE;

        sprctl |= SPRITE_ENABLE;

        if (IS_HASWELL(dev) || IS_BROADWELL(dev))
                sprctl |= SPRITE_PIPE_CSC_ENABLE;

        intel_update_sprite_watermarks(plane, crtc, src_w, src_h, pixel_size,
                                       true,
                                       src_w != crtc_w || src_h != crtc_h);

        /* Sizes are 0 based */
        src_w--;
        src_h--;
        crtc_w--;
        crtc_h--;

        if (crtc_w != src_w || crtc_h != src_h)
                sprscale = SPRITE_SCALE_ENABLE | (src_w << 16) | src_h;

        linear_offset = y * fb->pitches[0] + x * pixel_size;
        sprsurf_offset =
                intel_gen4_compute_page_offset(&x, &y, obj->tiling_mode,
                                               pixel_size, fb->pitches[0]);
        linear_offset -= sprsurf_offset;

        if (intel_plane->rotation == BIT(DRM_ROTATE_180)) {
                sprctl |= SPRITE_ROTATE_180;

                /* HSW and BDW does this automagically in hardware */
                if (!IS_HASWELL(dev) && !IS_BROADWELL(dev)) {
                        x += src_w;
                        y += src_h;
                        linear_offset += src_h * fb->pitches[0] +
                                src_w * pixel_size;
                }
        }

        atomic_update = intel_pipe_update_start(intel_crtc, &start_vbl_count);

        intel_update_primary_plane(intel_crtc);

        I915_WRITE(SPRSTRIDE(pipe), fb->pitches[0]);
        I915_WRITE(SPRPOS(pipe), (crtc_y << 16) | crtc_x);

        /* HSW consolidates SPRTILEOFF and SPRLINOFF into a single SPROFFSET
         * register */
        if (IS_HASWELL(dev) || IS_BROADWELL(dev))
                I915_WRITE(SPROFFSET(pipe), (y << 16) | x);
        else if (obj->tiling_mode != I915_TILING_NONE)
                I915_WRITE(SPRTILEOFF(pipe), (y << 16) | x);
        else
                I915_WRITE(SPRLINOFF(pipe), linear_offset);

        I915_WRITE(SPRSIZE(pipe), (crtc_h << 16) | crtc_w);
        if (intel_plane->can_scale)
                I915_WRITE(SPRSCALE(pipe), sprscale);
        I915_WRITE(SPRCTL(pipe), sprctl);
        I915_WRITE(SPRSURF(pipe),
                   i915_gem_obj_ggtt_offset(obj) + sprsurf_offset);

        intel_flush_primary_plane(dev_priv, intel_crtc->plane);

        if (atomic_update)
                intel_pipe_update_end(intel_crtc, start_vbl_count);
}

static void
ivb_disable_plane(struct drm_plane *plane, struct drm_crtc *crtc)
{
        struct drm_device *dev = plane->dev;
        struct drm_i915_private *dev_priv = dev->dev_private;
        struct intel_plane *intel_plane = to_intel_plane(plane);
        struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
        int pipe = intel_plane->pipe;
        u32 start_vbl_count;
        bool atomic_update;

        atomic_update = intel_pipe_update_start(intel_crtc, &start_vbl_count);

        intel_update_primary_plane(intel_crtc);

        I915_WRITE(SPRCTL(pipe), I915_READ(SPRCTL(pipe)) & ~SPRITE_ENABLE);
        /* Can't leave the scaler enabled... */
        if (intel_plane->can_scale)
                I915_WRITE(SPRSCALE(pipe), 0);
        /* Activate double buffered register update */
        I915_WRITE(SPRSURF(pipe), 0);

        intel_flush_primary_plane(dev_priv, intel_crtc->plane);

        if (atomic_update)
                intel_pipe_update_end(intel_crtc, start_vbl_count);

        /*
         * Avoid underruns when disabling the sprite.
         * FIXME remove once watermark updates are done properly.
         */
        intel_wait_for_vblank(dev, pipe);

        intel_update_sprite_watermarks(plane, crtc, 0, 0, 0, false, false);
}

static int
ivb_update_colorkey(struct drm_plane *plane,
                    struct drm_intel_sprite_colorkey *key)
{
        struct drm_device *dev = plane->dev;
        struct drm_i915_private *dev_priv = dev->dev_private;
        struct intel_plane *intel_plane;
        u32 sprctl;
        int ret = 0;

        intel_plane = to_intel_plane(plane);

        I915_WRITE(SPRKEYVAL(intel_plane->pipe), key->min_value);
        I915_WRITE(SPRKEYMAX(intel_plane->pipe), key->max_value);
        I915_WRITE(SPRKEYMSK(intel_plane->pipe), key->channel_mask);

        sprctl = I915_READ(SPRCTL(intel_plane->pipe));
        sprctl &= ~(SPRITE_SOURCE_KEY | SPRITE_DEST_KEY);
        if (key->flags & I915_SET_COLORKEY_DESTINATION)
                sprctl |= SPRITE_DEST_KEY;
        else if (key->flags & I915_SET_COLORKEY_SOURCE)
                sprctl |= SPRITE_SOURCE_KEY;
        I915_WRITE(SPRCTL(intel_plane->pipe), sprctl);

        POSTING_READ(SPRKEYMSK(intel_plane->pipe));

        return ret;
}

static void
ivb_get_colorkey(struct drm_plane *plane, struct drm_intel_sprite_colorkey *key)
{
        struct drm_device *dev = plane->dev;
        struct drm_i915_private *dev_priv = dev->dev_private;
        struct intel_plane *intel_plane;
        u32 sprctl;

        intel_plane = to_intel_plane(plane);

        key->min_value = I915_READ(SPRKEYVAL(intel_plane->pipe));
        key->max_value = I915_READ(SPRKEYMAX(intel_plane->pipe));
        key->channel_mask = I915_READ(SPRKEYMSK(intel_plane->pipe));
        key->flags = 0;

        sprctl = I915_READ(SPRCTL(intel_plane->pipe));

        if (sprctl & SPRITE_DEST_KEY)
                key->flags = I915_SET_COLORKEY_DESTINATION;
        else if (sprctl & SPRITE_SOURCE_KEY)
                key->flags = I915_SET_COLORKEY_SOURCE;
        else
                key->flags = I915_SET_COLORKEY_NONE;
}

static void
ilk_update_plane(struct drm_plane *plane, struct drm_crtc *crtc,
                 struct drm_framebuffer *fb,
                 struct drm_i915_gem_object *obj, int crtc_x, int crtc_y,
                 unsigned int crtc_w, unsigned int crtc_h,
                 uint32_t x, uint32_t y,
                 uint32_t src_w, uint32_t src_h)
{
        struct drm_device *dev = plane->dev;
        struct drm_i915_private *dev_priv = dev->dev_private;
        struct intel_plane *intel_plane = to_intel_plane(plane);
        struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
        int pipe = intel_plane->pipe;
        unsigned long dvssurf_offset, linear_offset;
        u32 dvscntr, dvsscale;
        int pixel_size = drm_format_plane_cpp(fb->pixel_format, 0);
        u32 start_vbl_count;
        bool atomic_update;

        dvscntr = I915_READ(DVSCNTR(pipe));

        /* Mask out pixel format bits in case we change it */
        dvscntr &= ~DVS_PIXFORMAT_MASK;
        dvscntr &= ~DVS_RGB_ORDER_XBGR;
        dvscntr &= ~DVS_YUV_BYTE_ORDER_MASK;
        dvscntr &= ~DVS_TILED;
        dvscntr &= ~DVS_ROTATE_180;

        switch (fb->pixel_format) {
        case DRM_FORMAT_XBGR8888:
                dvscntr |= DVS_FORMAT_RGBX888 | DVS_RGB_ORDER_XBGR;
                break;
        case DRM_FORMAT_XRGB8888:
                dvscntr |= DVS_FORMAT_RGBX888;
                break;
        case DRM_FORMAT_YUYV:
                dvscntr |= DVS_FORMAT_YUV422 | DVS_YUV_ORDER_YUYV;
                break;
        case DRM_FORMAT_YVYU:
                dvscntr |= DVS_FORMAT_YUV422 | DVS_YUV_ORDER_YVYU;
                break;
        case DRM_FORMAT_UYVY:
                dvscntr |= DVS_FORMAT_YUV422 | DVS_YUV_ORDER_UYVY;
                break;
        case DRM_FORMAT_VYUY:
                dvscntr |= DVS_FORMAT_YUV422 | DVS_YUV_ORDER_VYUY;
                break;
        default:
                BUG();
        }

        /*
         * Enable gamma to match primary/cursor plane behaviour.
         * FIXME should be user controllable via propertiesa.
         */
        dvscntr |= DVS_GAMMA_ENABLE;

        if (obj->tiling_mode != I915_TILING_NONE)
                dvscntr |= DVS_TILED;

        if (IS_GEN6(dev))
                dvscntr |= DVS_TRICKLE_FEED_DISABLE; /* must disable */
        dvscntr |= DVS_ENABLE;

        intel_update_sprite_watermarks(plane, crtc, src_w, src_h,
                                       pixel_size, true,
                                       src_w != crtc_w || src_h != crtc_h);

        /* Sizes are 0 based */
        src_w--;
        src_h--;
        crtc_w--;
        crtc_h--;

        dvsscale = 0;
        if (crtc_w != src_w || crtc_h != src_h)
                dvsscale = DVS_SCALE_ENABLE | (src_w << 16) | src_h;

        linear_offset = y * fb->pitches[0] + x * pixel_size;
        dvssurf_offset =
                intel_gen4_compute_page_offset(&x, &y, obj->tiling_mode,
                                               pixel_size, fb->pitches[0]);
        linear_offset -= dvssurf_offset;

        if (intel_plane->rotation == BIT(DRM_ROTATE_180)) {
                dvscntr |= DVS_ROTATE_180;

                x += src_w;
                y += src_h;
                linear_offset += src_h * fb->pitches[0] + src_w * pixel_size;
        }

        atomic_update = intel_pipe_update_start(intel_crtc, &start_vbl_count);

        intel_update_primary_plane(intel_crtc);

        I915_WRITE(DVSSTRIDE(pipe), fb->pitches[0]);
        I915_WRITE(DVSPOS(pipe), (crtc_y << 16) | crtc_x);

        if (obj->tiling_mode != I915_TILING_NONE)
                I915_WRITE(DVSTILEOFF(pipe), (y << 16) | x);
        else
                I915_WRITE(DVSLINOFF(pipe), linear_offset);

        I915_WRITE(DVSSIZE(pipe), (crtc_h << 16) | crtc_w);
        I915_WRITE(DVSSCALE(pipe), dvsscale);
        I915_WRITE(DVSCNTR(pipe), dvscntr);
        I915_WRITE(DVSSURF(pipe),
                   i915_gem_obj_ggtt_offset(obj) + dvssurf_offset);

        intel_flush_primary_plane(dev_priv, intel_crtc->plane);

        if (atomic_update)
                intel_pipe_update_end(intel_crtc, start_vbl_count);
}

static void
ilk_disable_plane(struct drm_plane *plane, struct drm_crtc *crtc)
{
        struct drm_device *dev = plane->dev;
        struct drm_i915_private *dev_priv = dev->dev_private;
        struct intel_plane *intel_plane = to_intel_plane(plane);
        struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
        int pipe = intel_plane->pipe;
        u32 start_vbl_count;
        bool atomic_update;

        atomic_update = intel_pipe_update_start(intel_crtc, &start_vbl_count);

        intel_update_primary_plane(intel_crtc);

        I915_WRITE(DVSCNTR(pipe), I915_READ(DVSCNTR(pipe)) & ~DVS_ENABLE);
        /* Disable the scaler */
        I915_WRITE(DVSSCALE(pipe), 0);
        /* Flush double buffered register updates */
        I915_WRITE(DVSSURF(pipe), 0);

        intel_flush_primary_plane(dev_priv, intel_crtc->plane);

        if (atomic_update)
                intel_pipe_update_end(intel_crtc, start_vbl_count);

        /*
         * Avoid underruns when disabling the sprite.
         * FIXME remove once watermark updates are done properly.
         */
        intel_wait_for_vblank(dev, pipe);

        intel_update_sprite_watermarks(plane, crtc, 0, 0, 0, false, false);
}

static void
intel_post_enable_primary(struct drm_crtc *crtc)
{
        struct drm_device *dev = crtc->dev;
        struct intel_crtc *intel_crtc = to_intel_crtc(crtc);

        /*
         * BDW signals flip done immediately if the plane
         * is disabled, even if the plane enable is already
         * armed to occur at the next vblank :(
         */
        if (IS_BROADWELL(dev))
                intel_wait_for_vblank(dev, intel_crtc->pipe);

        /*
         * FIXME IPS should be fine as long as one plane is
         * enabled, but in practice it seems to have problems

         * when going from primary only to sprite only and vice
         * versa.
         */
        hsw_enable_ips(intel_crtc);

        mutex_lock(&dev->struct_mutex);
        intel_update_fbc(dev);
        mutex_unlock(&dev->struct_mutex);
}

static void
intel_pre_disable_primary(struct drm_crtc *crtc)
{
        struct drm_device *dev = crtc->dev;
        struct drm_i915_private *dev_priv = dev->dev_private;
        struct intel_crtc *intel_crtc = to_intel_crtc(crtc);

        mutex_lock(&dev->struct_mutex);
        if (dev_priv->fbc.plane == intel_crtc->plane)
                intel_disable_fbc(dev);
        mutex_unlock(&dev->struct_mutex);

        /*
         * FIXME IPS should be fine as long as one plane is
         * enabled, but in practice it seems to have problems
         * when going from primary only to sprite only and vice
         * versa.
         */
        hsw_disable_ips(intel_crtc);
}

static int
ilk_update_colorkey(struct drm_plane *plane,
                    struct drm_intel_sprite_colorkey *key)
{
        struct drm_device *dev = plane->dev;
        struct drm_i915_private *dev_priv = dev->dev_private;
        struct intel_plane *intel_plane;
        u32 dvscntr;
        int ret = 0;

        intel_plane = to_intel_plane(plane);

        I915_WRITE(DVSKEYVAL(intel_plane->pipe), key->min_value);
        I915_WRITE(DVSKEYMAX(intel_plane->pipe), key->max_value);
        I915_WRITE(DVSKEYMSK(intel_plane->pipe), key->channel_mask);

        dvscntr = I915_READ(DVSCNTR(intel_plane->pipe));
        dvscntr &= ~(DVS_SOURCE_KEY | DVS_DEST_KEY);
        if (key->flags & I915_SET_COLORKEY_DESTINATION)
                dvscntr |= DVS_DEST_KEY;
        else if (key->flags & I915_SET_COLORKEY_SOURCE)
                dvscntr |= DVS_SOURCE_KEY;
        I915_WRITE(DVSCNTR(intel_plane->pipe), dvscntr);

        POSTING_READ(DVSKEYMSK(intel_plane->pipe));

        return ret;
}

static void
ilk_get_colorkey(struct drm_plane *plane, struct drm_intel_sprite_colorkey *key)
{
        struct drm_device *dev = plane->dev;
        struct drm_i915_private *dev_priv = dev->dev_private;
        struct intel_plane *intel_plane;
        u32 dvscntr;

        intel_plane = to_intel_plane(plane);

        key->min_value = I915_READ(DVSKEYVAL(intel_plane->pipe));
        key->max_value = I915_READ(DVSKEYMAX(intel_plane->pipe));
        key->channel_mask = I915_READ(DVSKEYMSK(intel_plane->pipe));
        key->flags = 0;

        dvscntr = I915_READ(DVSCNTR(intel_plane->pipe));

        if (dvscntr & DVS_DEST_KEY)
                key->flags = I915_SET_COLORKEY_DESTINATION;
        else if (dvscntr & DVS_SOURCE_KEY)
                key->flags = I915_SET_COLORKEY_SOURCE;
        else
                key->flags = I915_SET_COLORKEY_NONE;
}

static bool colorkey_enabled(struct intel_plane *intel_plane)
{
        struct drm_intel_sprite_colorkey key;

        intel_plane->get_colorkey(&intel_plane->base, &key);

        return key.flags != I915_SET_COLORKEY_NONE;
}

static int
intel_check_sprite_plane(struct drm_plane *plane,
                         struct intel_plane_state *state)
{
        struct intel_crtc *intel_crtc = to_intel_crtc(state->crtc);
        struct intel_plane *intel_plane = to_intel_plane(plane);
        struct drm_framebuffer *fb = state->fb;
        struct drm_i915_gem_object *obj = intel_fb_obj(fb);
        int crtc_x, crtc_y;
        unsigned int crtc_w, crtc_h;
        uint32_t src_x, src_y, src_w, src_h;
        struct drm_rect *src = &state->src;
        struct drm_rect *dst = &state->dst;
        struct drm_rect *orig_src = &state->orig_src;
        const struct drm_rect *clip = &state->clip;
        int hscale, vscale;
        int max_scale, min_scale;
        int pixel_size = drm_format_plane_cpp(fb->pixel_format, 0);

        /* Don't modify another pipe's plane */
        if (intel_plane->pipe != intel_crtc->pipe) {
                DRM_DEBUG_KMS("Wrong plane <-> crtc mapping\n");
                return -EINVAL;
        }

        /* FIXME check all gen limits */
        if (fb->width < 3 || fb->height < 3 || fb->pitches[0] > 16384) {
                DRM_DEBUG_KMS("Unsuitable framebuffer for plane\n");
                return -EINVAL;
        }

        /* Sprite planes can be linear or x-tiled surfaces */
        switch (obj->tiling_mode) {
                case I915_TILING_NONE:
                case I915_TILING_X:
                        break;
                default:
                        DRM_DEBUG_KMS("Unsupported tiling mode\n");
                        return -EINVAL;
        }

        /*
         * FIXME the following code does a bunch of fuzzy adjustments to the
         * coordinates and sizes. We probably need some way to decide whether
         * more strict checking should be done instead.
         */
        max_scale = intel_plane->max_downscale << 16;
        min_scale = intel_plane->can_scale ? 1 : (1 << 16);

        drm_rect_rotate(src, fb->width << 16, fb->height << 16,
                        intel_plane->rotation);

        hscale = drm_rect_calc_hscale_relaxed(src, dst, min_scale, max_scale);
        BUG_ON(hscale < 0);

        vscale = drm_rect_calc_vscale_relaxed(src, dst, min_scale, max_scale);
        BUG_ON(vscale < 0);

        state->visible =  drm_rect_clip_scaled(src, dst, clip, hscale, vscale);

        crtc_x = dst->x1;
        crtc_y = dst->y1;
        crtc_w = drm_rect_width(dst);
        crtc_h = drm_rect_height(dst);

        if (state->visible) {
                /* check again in case clipping clamped the results */
                hscale = drm_rect_calc_hscale(src, dst, min_scale, max_scale);
                if (hscale < 0) {
                        DRM_DEBUG_KMS("Horizontal scaling factor out of limits\n");
                        drm_rect_debug_print(src, true);
                        drm_rect_debug_print(dst, false);

                        return hscale;
                }

                vscale = drm_rect_calc_vscale(src, dst, min_scale, max_scale);
                if (vscale < 0) {
                        DRM_DEBUG_KMS("Vertical scaling factor out of limits\n");
                        drm_rect_debug_print(src, true);
                        drm_rect_debug_print(dst, false);

                        return vscale;
                }

                /* Make the source viewport size an exact multiple of the scaling factors. */
                drm_rect_adjust_size(src,
                                     drm_rect_width(dst) * hscale - drm_rect_width(src),
                                     drm_rect_height(dst) * vscale - drm_rect_height(src));

                drm_rect_rotate_inv(src, fb->width << 16, fb->height << 16,
                                    intel_plane->rotation);

                /* sanity check to make sure the src viewport wasn't enlarged */
                WARN_ON(src->x1 < (int) orig_src->x1 ||
                        src->y1 < (int) orig_src->y1 ||
                        src->x2 > (int) orig_src->x2 ||
                        src->y2 > (int) orig_src->y2);

                /*
                 * Hardware doesn't handle subpixel coordinates.
                 * Adjust to (macro)pixel boundary, but be careful not to
                 * increase the source viewport size, because that could
                 * push the downscaling factor out of bounds.
                 */
                src_x = src->x1 >> 16;
                src_w = drm_rect_width(src) >> 16;
                src_y = src->y1 >> 16;
                src_h = drm_rect_height(src) >> 16;

                if (format_is_yuv(fb->pixel_format)) {
                        src_x &= ~1;
                        src_w &= ~1;

                        /*
                         * Must keep src and dst the
                         * same if we can't scale.
                         */
                        if (!intel_plane->can_scale)
                                crtc_w &= ~1;

                        if (crtc_w == 0)
                                state->visible = false;
                }
        }

        /* Check size restrictions when scaling */
        if (state->visible && (src_w != crtc_w || src_h != crtc_h)) {
                unsigned int width_bytes;

                WARN_ON(!intel_plane->can_scale);

                /* FIXME interlacing min height is 6 */

                if (crtc_w < 3 || crtc_h < 3)
                        state->visible = false;

                if (src_w < 3 || src_h < 3)
                        state->visible = false;

                width_bytes = ((src_x * pixel_size) & 63) +
                                        src_w * pixel_size;

                if (src_w > 2048 || src_h > 2048 ||
                    width_bytes > 4096 || fb->pitches[0] > 4096) {
                        DRM_DEBUG_KMS("Source dimensions exceed hardware limits\n");
                        return -EINVAL;
                }
        }

        if (state->visible) {
                src->x1 = src_x;
                src->x2 = src_x + src_w;
                src->y1 = src_y;
                src->y2 = src_y + src_h;
        }

        dst->x1 = crtc_x;
        dst->x2 = crtc_x + crtc_w;
        dst->y1 = crtc_y;
        dst->y2 = crtc_y + crtc_h;

        return 0;
}

static int
intel_prepare_sprite_plane(struct drm_plane *plane,
                           struct intel_plane_state *state)
{
        struct drm_device *dev = plane->dev;
        struct drm_crtc *crtc = state->crtc;
        struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
        struct intel_plane *intel_plane = to_intel_plane(plane);
        enum pipe pipe = intel_crtc->pipe;
        struct drm_framebuffer *fb = state->fb;
        struct drm_i915_gem_object *obj = intel_fb_obj(fb);
        struct drm_i915_gem_object *old_obj = intel_plane->obj;
        int ret;

        if (old_obj != obj) {
                mutex_lock(&dev->struct_mutex);

                /* Note that this will apply the VT-d workaround for scanouts,
                 * which is more restrictive than required for sprites. (The
                 * primary plane requires 256KiB alignment with 64 PTE padding,
                 * the sprite planes only require 128KiB alignment and 32 PTE
                 * padding.
                 */
                ret = intel_pin_and_fence_fb_obj(plane, fb, NULL);
                if (ret == 0)
                        i915_gem_track_fb(old_obj, obj,
                                          INTEL_FRONTBUFFER_SPRITE(pipe));
                mutex_unlock(&dev->struct_mutex);
                if (ret)
                        return ret;
        }

        return 0;
}

static void
intel_commit_sprite_plane(struct drm_plane *plane,
                          struct intel_plane_state *state)
{
        struct drm_device *dev = plane->dev;
        struct drm_crtc *crtc = state->crtc;
        struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
        struct intel_plane *intel_plane = to_intel_plane(plane);
        enum pipe pipe = intel_crtc->pipe;
        struct drm_framebuffer *fb = state->fb;
        struct drm_i915_gem_object *obj = intel_fb_obj(fb);
        struct drm_i915_gem_object *old_obj = intel_plane->obj;
        int crtc_x, crtc_y;
        unsigned int crtc_w, crtc_h;
        uint32_t src_x, src_y, src_w, src_h;
        struct drm_rect *dst = &state->dst;
        const struct drm_rect *clip = &state->clip;
        bool primary_enabled;

        /*
         * If the sprite is completely covering the primary plane,
         * we can disable the primary and save power.
         */
        primary_enabled = !drm_rect_equals(dst, clip) || colorkey_enabled(intel_plane);
        WARN_ON(!primary_enabled && !state->visible && intel_crtc->active);

        intel_plane->crtc_x = state->orig_dst.x1;
        intel_plane->crtc_y = state->orig_dst.y1;
        intel_plane->crtc_w = drm_rect_width(&state->orig_dst);
        intel_plane->crtc_h = drm_rect_height(&state->orig_dst);
        intel_plane->src_x = state->orig_src.x1;
        intel_plane->src_y = state->orig_src.y1;
        intel_plane->src_w = drm_rect_width(&state->orig_src);
        intel_plane->src_h = drm_rect_height(&state->orig_src);
        intel_plane->obj = obj;

        if (intel_crtc->active) {
                bool primary_was_enabled = intel_crtc->primary_enabled;

                intel_crtc->primary_enabled = primary_enabled;

                if (primary_was_enabled != primary_enabled)
                        intel_crtc_wait_for_pending_flips(crtc);

                if (primary_was_enabled && !primary_enabled)
                        intel_pre_disable_primary(crtc);

                if (state->visible) {
                        crtc_x = state->dst.x1;
                        crtc_y = state->dst.y1;
                        crtc_w = drm_rect_width(&state->dst);
                        crtc_h = drm_rect_height(&state->dst);
                        src_x = state->src.x1;
                        src_y = state->src.y1;
                        src_w = drm_rect_width(&state->src);
                        src_h = drm_rect_height(&state->src);
                        intel_plane->update_plane(plane, crtc, fb, obj,
                                                  crtc_x, crtc_y, crtc_w, crtc_h,
                                                  src_x, src_y, src_w, src_h);
                } else {
                        intel_plane->disable_plane(plane, crtc);
                }


                intel_frontbuffer_flip(dev, INTEL_FRONTBUFFER_SPRITE(pipe));

                if (!primary_was_enabled && primary_enabled)
                        intel_post_enable_primary(crtc);
        }

        /* Unpin old obj after new one is active to avoid ugliness */
        if (old_obj && old_obj != obj) {

                /*
                 * It's fairly common to simply update the position of
                 * an existing object.  In that case, we don't need to
                 * wait for vblank to avoid ugliness, we only need to
                 * do the pin & ref bookkeeping.
                 */
                if (intel_crtc->active)
                        intel_wait_for_vblank(dev, intel_crtc->pipe);

                mutex_lock(&dev->struct_mutex);
                intel_unpin_fb_obj(old_obj);
                mutex_unlock(&dev->struct_mutex);
        }
}

static int
intel_update_plane(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 intel_plane_state state;
        struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
        int ret;

        state.crtc = crtc;
        state.fb = fb;

        /* sample coordinates in 16.16 fixed point */
        state.src.x1 = src_x;
        state.src.x2 = src_x + src_w;
        state.src.y1 = src_y;
        state.src.y2 = src_y + src_h;

        /* integer pixels */
        state.dst.x1 = crtc_x;
        state.dst.x2 = crtc_x + crtc_w;
        state.dst.y1 = crtc_y;
        state.dst.y2 = crtc_y + crtc_h;

        state.clip.x1 = 0;
        state.clip.y1 = 0;
        state.clip.x2 = intel_crtc->active ? intel_crtc->config.pipe_src_w : 0;
        state.clip.y2 = intel_crtc->active ? intel_crtc->config.pipe_src_h : 0;
        state.orig_src = state.src;
        state.orig_dst = state.dst;

        ret = intel_check_sprite_plane(plane, &state);
        if (ret)
                return ret;

        ret = intel_prepare_sprite_plane(plane, &state);
        if (ret)
                return ret;

        intel_commit_sprite_plane(plane, &state);
        return 0;
}

static int
intel_disable_plane(struct drm_plane *plane)
{
        struct drm_device *dev = plane->dev;
        struct intel_plane *intel_plane = to_intel_plane(plane);
        struct intel_crtc *intel_crtc;
        enum pipe pipe;

        if (!plane->fb)
                return 0;

        if (WARN_ON(!plane->crtc))
                return -EINVAL;

        intel_crtc = to_intel_crtc(plane->crtc);
        pipe = intel_crtc->pipe;

        if (intel_crtc->active) {
                bool primary_was_enabled = intel_crtc->primary_enabled;

                intel_crtc->primary_enabled = true;

                intel_plane->disable_plane(plane, plane->crtc);

                if (!primary_was_enabled && intel_crtc->primary_enabled)
                        intel_post_enable_primary(plane->crtc);
        }

        if (intel_plane->obj) {
                if (intel_crtc->active)
                        intel_wait_for_vblank(dev, intel_plane->pipe);

                mutex_lock(&dev->struct_mutex);
                intel_unpin_fb_obj(intel_plane->obj);
                i915_gem_track_fb(intel_plane->obj, NULL,
                                  INTEL_FRONTBUFFER_SPRITE(pipe));
                mutex_unlock(&dev->struct_mutex);

                intel_plane->obj = NULL;
        }

        return 0;
}

static void intel_destroy_plane(struct drm_plane *plane)
{
        struct intel_plane *intel_plane = to_intel_plane(plane);
        intel_disable_plane(plane);
        drm_plane_cleanup(plane);
        kfree(intel_plane);
}

int intel_sprite_set_colorkey(struct drm_device *dev, void *data,
                              struct drm_file *file_priv)
{
        struct drm_intel_sprite_colorkey *set = data;
        struct drm_plane *plane;
        struct intel_plane *intel_plane;
        int ret = 0;

        if (!drm_core_check_feature(dev, DRIVER_MODESET))
                return -ENODEV;

        /* Make sure we don't try to enable both src & dest simultaneously */
        if ((set->flags & (I915_SET_COLORKEY_DESTINATION | I915_SET_COLORKEY_SOURCE)) == (I915_SET_COLORKEY_DESTINATION | I915_SET_COLORKEY_SOURCE))
                return -EINVAL;

        drm_modeset_lock_all(dev);

        plane = drm_plane_find(dev, set->plane_id);
        if (!plane) {
                ret = -ENOENT;
                goto out_unlock;
        }

        intel_plane = to_intel_plane(plane);
        ret = intel_plane->update_colorkey(plane, set);

out_unlock:
        drm_modeset_unlock_all(dev);
        return ret;
}

int intel_sprite_get_colorkey(struct drm_device *dev, void *data,
                              struct drm_file *file_priv)
{
        struct drm_intel_sprite_colorkey *get = data;
        struct drm_plane *plane;
        struct intel_plane *intel_plane;
        int ret = 0;

        if (!drm_core_check_feature(dev, DRIVER_MODESET))
                return -ENODEV;

        drm_modeset_lock_all(dev);

        plane = drm_plane_find(dev, get->plane_id);
        if (!plane) {
                ret = -ENOENT;
                goto out_unlock;
        }

        intel_plane = to_intel_plane(plane);
        intel_plane->get_colorkey(plane, get);

out_unlock:
        drm_modeset_unlock_all(dev);
        return ret;
}

int intel_plane_set_property(struct drm_plane *plane,
                             struct drm_property *prop,
                             uint64_t val)
{
        struct drm_device *dev = plane->dev;
        struct intel_plane *intel_plane = to_intel_plane(plane);
        uint64_t old_val;
        int ret = -ENOENT;

        if (prop == dev->mode_config.rotation_property) {
                /* exactly one rotation angle please */
                if (hweight32(val & 0xf) != 1)
                        return -EINVAL;

                if (intel_plane->rotation == val)
                        return 0;

                old_val = intel_plane->rotation;
                intel_plane->rotation = val;
                ret = intel_plane_restore(plane);
                if (ret)
                        intel_plane->rotation = old_val;
        }

        return ret;
}

int intel_plane_restore(struct drm_plane *plane)
{
        struct intel_plane *intel_plane = to_intel_plane(plane);

        if (!plane->crtc || !plane->fb)
                return 0;

        return plane->funcs->update_plane(plane, plane->crtc, plane->fb,
                                  intel_plane->crtc_x, intel_plane->crtc_y,
                                  intel_plane->crtc_w, intel_plane->crtc_h,
                                  intel_plane->src_x, intel_plane->src_y,
                                  intel_plane->src_w, intel_plane->src_h);
}

void intel_plane_disable(struct drm_plane *plane)
{
        if (!plane->crtc || !plane->fb)
                return;

        intel_disable_plane(plane);
}

static const struct drm_plane_funcs intel_plane_funcs = {
        .update_plane = intel_update_plane,
        .disable_plane = intel_disable_plane,
        .destroy = intel_destroy_plane,
        .set_property = intel_plane_set_property,
};

static uint32_t ilk_plane_formats[] = {
        DRM_FORMAT_XRGB8888,
        DRM_FORMAT_YUYV,
        DRM_FORMAT_YVYU,
        DRM_FORMAT_UYVY,
        DRM_FORMAT_VYUY,
};

static uint32_t snb_plane_formats[] = {
        DRM_FORMAT_XBGR8888,
        DRM_FORMAT_XRGB8888,
        DRM_FORMAT_YUYV,
        DRM_FORMAT_YVYU,
        DRM_FORMAT_UYVY,
        DRM_FORMAT_VYUY,
};

static uint32_t vlv_plane_formats[] = {
        DRM_FORMAT_RGB565,
        DRM_FORMAT_ABGR8888,
        DRM_FORMAT_ARGB8888,
        DRM_FORMAT_XBGR8888,
        DRM_FORMAT_XRGB8888,
        DRM_FORMAT_XBGR2101010,
        DRM_FORMAT_ABGR2101010,
        DRM_FORMAT_YUYV,
        DRM_FORMAT_YVYU,
        DRM_FORMAT_UYVY,
        DRM_FORMAT_VYUY,
};

static uint32_t skl_plane_formats[] = {
        DRM_FORMAT_RGB565,
        DRM_FORMAT_ABGR8888,
        DRM_FORMAT_ARGB8888,
        DRM_FORMAT_XBGR8888,
        DRM_FORMAT_XRGB8888,
        DRM_FORMAT_YUYV,
        DRM_FORMAT_YVYU,
        DRM_FORMAT_UYVY,
        DRM_FORMAT_VYUY,
};

int
intel_plane_init(struct drm_device *dev, enum pipe pipe, int plane)
{
        struct intel_plane *intel_plane;
        unsigned long possible_crtcs;
        const uint32_t *plane_formats;
        int num_plane_formats;
        int ret;

        if (INTEL_INFO(dev)->gen < 5)
                return -ENODEV;

        intel_plane = kzalloc(sizeof(*intel_plane), GFP_KERNEL);
        if (!intel_plane)
                return -ENOMEM;

        switch (INTEL_INFO(dev)->gen) {
        case 5:
        case 6:
                intel_plane->can_scale = true;
                intel_plane->max_downscale = 16;
                intel_plane->update_plane = ilk_update_plane;
                intel_plane->disable_plane = ilk_disable_plane;
                intel_plane->update_colorkey = ilk_update_colorkey;
                intel_plane->get_colorkey = ilk_get_colorkey;

                if (IS_GEN6(dev)) {
                        plane_formats = snb_plane_formats;
                        num_plane_formats = ARRAY_SIZE(snb_plane_formats);
                } else {
                        plane_formats = ilk_plane_formats;
                        num_plane_formats = ARRAY_SIZE(ilk_plane_formats);
                }
                break;

        case 7:
        case 8:
                if (IS_IVYBRIDGE(dev)) {
                        intel_plane->can_scale = true;
                        intel_plane->max_downscale = 2;
                } else {
                        intel_plane->can_scale = false;
                        intel_plane->max_downscale = 1;
                }

                if (IS_VALLEYVIEW(dev)) {
                        intel_plane->update_plane = vlv_update_plane;
                        intel_plane->disable_plane = vlv_disable_plane;
                        intel_plane->update_colorkey = vlv_update_colorkey;
                        intel_plane->get_colorkey = vlv_get_colorkey;

                        plane_formats = vlv_plane_formats;
                        num_plane_formats = ARRAY_SIZE(vlv_plane_formats);
                } else {
                        intel_plane->update_plane = ivb_update_plane;
                        intel_plane->disable_plane = ivb_disable_plane;
                        intel_plane->update_colorkey = ivb_update_colorkey;
                        intel_plane->get_colorkey = ivb_get_colorkey;

                        plane_formats = snb_plane_formats;
                        num_plane_formats = ARRAY_SIZE(snb_plane_formats);
                }
                break;
        case 9:
                /*
                 * FIXME: Skylake planes can be scaled (with some restrictions),
                 * but this is for another time.
                 */
                intel_plane->can_scale = false;
                intel_plane->max_downscale = 1;
                intel_plane->update_plane = skl_update_plane;
                intel_plane->disable_plane = skl_disable_plane;
                intel_plane->update_colorkey = skl_update_colorkey;
                intel_plane->get_colorkey = skl_get_colorkey;

                plane_formats = skl_plane_formats;
                num_plane_formats = ARRAY_SIZE(skl_plane_formats);
                break;
        default:
                kfree(intel_plane);
                return -ENODEV;
        }

        intel_plane->pipe = pipe;
        intel_plane->plane = plane;
        intel_plane->rotation = BIT(DRM_ROTATE_0);
        possible_crtcs = (1 << pipe);
        ret = drm_universal_plane_init(dev, &intel_plane->base, possible_crtcs,
                                       &intel_plane_funcs,
                                       plane_formats, num_plane_formats,
                                       DRM_PLANE_TYPE_OVERLAY);
        if (ret) {
                kfree(intel_plane);
                goto out;
        }

        if (!dev->mode_config.rotation_property)
                dev->mode_config.rotation_property =
                        drm_mode_create_rotation_property(dev,
                                                          BIT(DRM_ROTATE_0) |
                                                          BIT(DRM_ROTATE_180));

        if (dev->mode_config.rotation_property)
                drm_object_attach_property(&intel_plane->base.base,
                                           dev->mode_config.rotation_property,
                                           intel_plane->rotation);

 out:
        return ret;
}