diff mbox

drm/i915: make sure plane control reg changes take effect

Message ID 1311878804-9600-1-git-send-email-jbarnes@virtuousgeek.org (mailing list archive)
State New, archived
Headers show

Commit Message

Jesse Barnes July 28, 2011, 6:46 p.m. UTC 
After writing to the plane control reg we need to write to the surface
reg to trigger the double buffered register latch.

Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
---
 drivers/gpu/drm/i915/intel_display.c |    2 ++
 1 files changed, 2 insertions(+), 0 deletions(-)
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Patch

diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
index 32ffde2..9fefba3 100644
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -1333,6 +1333,8 @@  static void intel_disable_plane(struct drm_i915_private *dev_priv,
 		return;
 
 	I915_WRITE(reg, val & ~DISPLAY_PLANE_ENABLE);
+	/* Flush out the double buffered plane control reg */
+	I915_WRITE(DSPSURF(plane), I915_READ(DSPSURF(plane)));
 	intel_flush_display_plane(dev_priv, plane);
 	intel_wait_for_vblank(dev_priv->dev, pipe);
 }