[PATCH 2/2] drm/atomic-helper: Print an error if vblank wait times out

[ville.syrjala at linux.intel.com]

From: Ville Syrjälä <ville.syrjala at linux.intel.com>

Vblank waits timing out is no a normal thing to happen, so let's inform
people when it happens.

Signed-off-by: Ville Syrjälä <ville.syrjala at linux.intel.com>
---
 drivers/gpu/drm/drm_atomic_helper.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/gpu/drm/drm_atomic_helper.c b/drivers/gpu/drm/drm_atomic_helper.c
index 7bf678ee7f81..40c7b268a9bc 100644
--- a/drivers/gpu/drm/drm_atomic_helper.c
+++ b/drivers/gpu/drm/drm_atomic_helper.c
@@ -1103,6 +1103,8 @@ drm_atomic_helper_wait_for_vblanks(struct drm_device *dev,
 					drm_crtc_vblank_count(crtc),
 				msecs_to_jiffies(50));
 
+		WARN(!ret, "[CRTC:%d] vblank wait timed out\n", crtc->base.id);
+
 		drm_crtc_vblank_put(crtc);
 	}
 }
-- 
2.7.4