diff options
| author | Ville Syrjälä <[email protected]> | 2014-08-06 14:49:59 +0300 |
|---|---|---|
| committer | Daniel Vetter <[email protected]> | 2014-08-06 22:39:31 +0200 |
| commit | c50d7521617d823d769b280bc499e19e364434ae (patch) | |
| tree | 65883baedcfbffdee6ec8138c0c8fa547ded72a5 | |
| parent | 96a9fdd778037799f63c9ae272ec915dd3ad83dc (diff) | |
drm: Store the vblank timestamp when adjusting the counter during disable
During vblank disable the code tries to guess based on the
timestamps whether we just missed one vblank or not. And if so
it increments the counter. However it forgets to store the new
timestamp to the approriate slot in our timestamp ring buffer.
So anyone querying the timestamp for the resulting sequence
number would get a stale timestamp. Fix it up by storing the
new timestamp.
Signed-off-by: Ville Syrjälä <[email protected]>
Signed-off-by: Daniel Vetter <[email protected]>
| -rw-r--r-- | drivers/gpu/drm/drm_irq.c | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/drivers/gpu/drm/drm_irq.c b/drivers/gpu/drm/drm_irq.c index 62dee812d28a..aa9b06495067 100644 --- a/drivers/gpu/drm/drm_irq.c +++ b/drivers/gpu/drm/drm_irq.c @@ -198,6 +198,13 @@ static void vblank_disable_and_save(struct drm_device *dev, int crtc) * hope for the best. */ if ((vblrc > 0) && (abs64(diff_ns) > 1000000)) { + /* Store new timestamp in ringbuffer. */ + vblanktimestamp(dev, crtc, vblcount + 1) = tvblank; + + /* Increment cooked vblank count. This also atomically commits + * the timestamp computed above. + */ + smp_mb__before_atomic(); atomic_inc(&vblank->count); smp_mb__after_atomic(); } |