drm/atomic-helper: Print an error if vblank wait times out

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@linux.intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Link: http://patchwork.freedesktop.org/patch/msgid/1460978973-24945-2-git-send-email-ville.syrjala@linux.intel.com

diff --git a/drivers/gpu/drm/drm_atomic_helper.c b/drivers/gpu/drm/drm_atomic_helper.c
index 7bf678ee7f816da88016f25a9a6e08ea43b0b594..40c7b268a9bc51e68e836b01a3601f5e07285923 100644 (file)
--- 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);
        }
 }