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[i915] 2D driver may reset Frame count value, this may lead driver

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to leap it's vblank count a huge value.
  This will stall some applications that switch video mode if vblank_mode is set to a non zero value in drirc.
This commit is contained in:
Zou Nan hai 2008-03-03 14:49:49 +08:00
parent 09999c90ab
commit 63fd6f284d
1 changed files with 7 additions and 0 deletions
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7
shared-core/i915_irq.c
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@ -406,6 +406,13 @@ u32 i915_get_vblank_counter(struct drm_device *dev, int plane)
if (i915_in_vblank(dev, pipe))
count++;
#endif
/* count may be reset by other driver(e.g. 2D driver),
we have no way to know if it is wrapped or resetted
when count is zero. do a rough guess.
*/
if (count == 0 && dev->last_vblank[pipe] < dev->max_vblank_count/2)
dev->last_vblank[pipe] = 0;
return count;
}