drm/radeon: disable UVD advanced semaphore mode

Not needed and seems to cause some problems.

Signed-off-by: Christian König <christian.koenig@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
diff --git a/drivers/gpu/drm/radeon/r600.c b/drivers/gpu/drm/radeon/r600.c
index 709f3e4..1a08008 100644
--- a/drivers/gpu/drm/radeon/r600.c
+++ b/drivers/gpu/drm/radeon/r600.c
@@ -2625,7 +2625,7 @@
 	radeon_ring_write(ring, 0x8);
 
 	radeon_ring_write(ring, PACKET0(UVD_SEMA_CNTL, 0));
-	radeon_ring_write(ring, 1);
+	radeon_ring_write(ring, 3);
 
 	radeon_ring_unlock_commit(rdev, ring);