--- x/drivers/gpu/drm/drm_vblank.c
+++ y/drivers/gpu/drm/drm_vblank.c
@@ -276,7 +276,7 @@ static void drm_update_vblank_count(stru
 	struct drm_vblank_crtc *vblank = &dev->vblank[pipe];
 	u32 cur_vblank, diff;
 	bool rc;
-	ktime_t t_vblank;
+	ktime_t t_vblank = 128;
 	int count = DRM_TIMESTAMP_MAXRETRIES;
 	int framedur_ns = vblank->framedur_ns;
 	u32 max_vblank_count = drm_max_vblank_count(dev, pipe);