[PATCH 4/6] drm/atomic: Wait for vblank whenever a plane is added to state.

[Maarten Lankhorst]

The current api doesn't take into account that whenever properties like
rotation or z-pos change we have to wait for vblank. To make sure
that we wait correctly, err on the side of caution and wait whenever
a plane is added to state.

Signed-off-by: Maarten Lankhorst <maarten.lankhorst at linux.intel.com>
---
 drivers/gpu/drm/drm_atomic_helper.c | 6 +-----
 1 file changed, 1 insertion(+), 5 deletions(-)

diff --git a/drivers/gpu/drm/drm_atomic_helper.c b/drivers/gpu/drm/drm_atomic_helper.c
index ccf0bed9bf4a..fdeaea84a3b7 100644
--- a/drivers/gpu/drm/drm_atomic_helper.c
+++ b/drivers/gpu/drm/drm_atomic_helper.c
@@ -1123,11 +1123,7 @@ drm_atomic_helper_wait_for_vblanks(struct drm_device *dev,
 	for_each_crtc_in_state(old_state, crtc, old_crtc_state, i) {
 		struct drm_crtc_state *new_crtc_state = crtc->state;
 
-		if (!new_crtc_state->active)
-			continue;
-
-		if (!drm_atomic_helper_framebuffer_changed(dev,
-				old_state, crtc))
+		if (!new_crtc_state->active || !new_crtc_state->planes_changed)
 			continue;
 
 		ret = drm_crtc_vblank_get(crtc);
-- 
2.7.4