drm: Store the vblank timestamp when adjusting the counter during disable

[cascardo/linux.git] / drivers / gpu / drm / drm_irq.c

diff --git a/drivers/gpu/drm/drm_irq.c b/drivers/gpu/drm/drm_irq.c
index 62dee81..aa9b064 100644 (file)
--- 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();
        }