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Diffstat (limited to 'shared-core/i915_irq.c')
| -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 dad6ef86..b9d137f4 100644 --- a/shared-core/i915_irq.c +++ b/shared-core/i915_irq.c @@ -415,6 +415,13 @@ 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; } |