drm/i915: fix pipe source image setting in flip command

The MI_DISPLAY_FLIP command needs to be set the same pipe
source image like in pipe source register, e.g source image
size minus one. This fixes screen corrupt issue on Ironlake.

Signed-off-by: Zhenyu Wang <zhenyuw@linux.intel.com>
Signed-off-by: Eric Anholt <eric@anholt.net>

1 files changed, 4 insertions, 2 deletions

diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
index dc6ffe82d2cd..c161ace7132d 100644
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -4180,7 +4180,8 @@ static int intel_crtc_page_flip(struct drm_crtc *crtc,
         struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
         struct intel_unpin_work *work;
         unsigned long flags;
-        int ret;
+        int pipesrc_reg = (intel_crtc->pipe == 0) ? PIPEASRC : PIPEBSRC;
+        int ret, pipesrc;
         RING_LOCALS;
 
         work = kzalloc(sizeof *work, GFP_KERNEL);
@@ -4236,7 +4237,8 @@ static int intel_crtc_page_flip(struct drm_crtc *crtc,
         OUT_RING(fb->pitch);
         if (IS_I965G(dev)) {
                 OUT_RING(obj_priv->gtt_offset | obj_priv->tiling_mode);
-                OUT_RING((fb->width << 16) | fb->height);
+                pipesrc = I915_READ(pipesrc_reg); 
+                OUT_RING(pipesrc & 0x0fff0fff);
         } else {
                 OUT_RING(obj_priv->gtt_offset);
                 OUT_RING(MI_NOOP);