sna: Set the flush interval based on output vrefresh

Rather than a blank 25Hz, use twice the vblank interval to hopefully
avoid bad values.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>

1 files changed, 2 insertions, 0 deletions

diff --git a/src/sna/sna.h b/src/sna/sna.h
index f045fa50..3d2ecaf8 100644
--- a/src/sna/sna.h
+++ b/src/sna/sna.h
@@ -212,6 +212,8 @@ struct sna {
 	int timer[NUM_TIMERS];
 	int timer_active;
 
+	int flush_interval;
+
 	struct list deferred_free;
 	struct list dirty_pixmaps;