diff options
| author | Zou Nan hai <nanhai.zou@intel.com> | 2008-03-03 14:49:49 +0800 |
|---|---|---|
| committer | Zou Nan hai <nanhai.zou@intel.com> | 2008-03-03 14:49:49 +0800 |
| commit | 63fd6f284ddd1096d34b39941683ae244c1e01fc (patch) | |
| tree | 00a69619af152259848763c66c9e0716ed74817e /shared-core | |
| parent | 09999c90ab1bf3f7d8b277895c962c8a7b3afc18 (diff) | |
[i915] 2D driver may reset Frame count value, this may lead driver
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.
Diffstat (limited to 'shared-core')
| -rw-r--r-- | shared-core/i915_irq.c | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/shared-core/i915_irq.c b/shared-core/i915_irq.c index fd08b6e8..126f0379 100644 --- a/shared-core/i915_irq.c +++ b/shared-core/i915_irq.c @@ -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; } |