1 files changed, 5 insertions, 2 deletions

diff --git a/drivers/gpu/drm/drm_irq.c b/drivers/gpu/drm/drm_irq.c
index 80ff94ada75e..5ef03c216a27 100644
--- a/drivers/gpu/drm/drm_irq.c
+++ b/drivers/gpu/drm/drm_irq.c
@@ -126,6 +126,9 @@ static void drm_update_vblank_count(struct drm_device *dev, int crtc)
         DRM_DEBUG("updating vblank count on crtc %d, missed %d\n",
                   crtc, diff);
 
+        if (diff == 0)
+                return;
+
         /* Reinitialize corresponding vblank timestamp if high-precision query
          * available. Skip this step if query unsupported or failed. Will
          * reinitialize delayed at next vblank interrupt in that case.
@@ -1074,7 +1077,7 @@ void drm_wait_one_vblank(struct drm_device *dev, int crtc)
         u32 last;
 
         ret = drm_vblank_get(dev, crtc);
-        if (WARN_ON(ret))
+        if (WARN(ret, "vblank not available on crtc %i, ret=%i\n", crtc, ret))
                 return;
 
         last = drm_vblank_count(dev, crtc);
@@ -1083,7 +1086,7 @@ void drm_wait_one_vblank(struct drm_device *dev, int crtc)
                                  last != drm_vblank_count(dev, crtc),
                                  msecs_to_jiffies(100));
 
-        WARN_ON(ret == 0);
+        WARN(ret == 0, "vblank wait timed out on crtc %i\n", crtc);
 
         drm_vblank_put(dev, crtc);
 }