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drm/i915: fix vblank wait test condition

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When converting this to the new wait_for macro I inverted the wait
condition, which causes all sorts of problems.  So correct it to fix
several failures caused by the bad wait (flickering, bad output
detection, tearing, etc.).

Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>
Tested-by: Sitsofe Wheeler <sitsofe@yahoo.com>
Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Jesse Barnes 2010-08-24 11:31:16 -07:00 • committed by Linus Torvalds
commit 9559fcdbff
1 changed files with 1 additions and 1 deletions
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2
drivers/gpu/drm/i915/intel_display.c
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@ -992,7 +992,7 @@ void intel_wait_for_vblank(struct drm_device *dev, int pipe)
/* Wait for vblank interrupt bit to set */
if (wait_for((I915_READ(pipestat_reg) &
PIPE_VBLANK_INTERRUPT_STATUS) == 0,
PIPE_VBLANK_INTERRUPT_STATUS),
50, 0))
DRM_DEBUG_KMS("vblank wait timed out\n");
}