+static void mdp4_crtc_wait_for_flush_done(struct drm_crtc *crtc)
+{
+ struct drm_device *dev = crtc->dev;
+ struct mdp4_crtc *mdp4_crtc = to_mdp4_crtc(crtc);
+ struct mdp4_kms *mdp4_kms = get_kms(crtc);
+ int ret;
+
+ ret = drm_crtc_vblank_get(crtc);
+ if (ret)
+ return;
+
+ ret = wait_event_timeout(dev->vblank[drm_crtc_index(crtc)].queue,
+ !(mdp4_read(mdp4_kms, REG_MDP4_OVERLAY_FLUSH) &
+ mdp4_crtc->flushed_mask),
+ msecs_to_jiffies(50));
+ if (ret <= 0)
+ dev_warn(dev->dev, "vblank time out, crtc=%d\n", mdp4_crtc->id);
+
+ mdp4_crtc->flushed_mask = 0;
+
+ drm_crtc_vblank_put(crtc);
+}
+