If we don't flush the write then we can not be sure that the border
colour will have taken effect by the time we try to read it back.
Signed-off-by: Chris Wilson <ch...@chris-wilson.co.uk>
---
drivers/gpu/drm/i915/intel_crt.c | 1 +
1 files changed, 1 insertions(+), 0 deletions(-)
diff --git a/drivers/gpu/drm/i915/intel_crt.c b/drivers/gpu/drm/i915/intel_crt.c
index 4b77351..f915793 100644
--- a/drivers/gpu/drm/i915/intel_crt.c
+++ b/drivers/gpu/drm/i915/intel_crt.c
@@ -327,6 +327,7 @@ intel_crt_load_detect(struct drm_crtc *crtc, struct
intel_encoder *intel_encoder
if (IS_I9XX(dev)) {
uint32_t pipeconf = I915_READ(pipeconf_reg);
I915_WRITE(pipeconf_reg, pipeconf | PIPECONF_FORCE_BORDER);
+ POSTING_READ(pipeconf_reg);
/* Wait for next Vblank to substitue
* border color for Color info */
intel_wait_for_vblank(dev, pipe);
--
1.7.1
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