2 files changed, 15 insertions, 7 deletions
diff --git a/drivers/gpu/drm/renesas/shmobile/shmob_drm_crtc.c b/drivers/gpu/drm/renesas/shmobile/shmob_drm_crtc.c
index 20adb9d2fa17..ab42a4999a55 100644
--- a/drivers/gpu/drm/renesas/shmobile/shmob_drm_crtc.c
+++ b/drivers/gpu/drm/renesas/shmobile/shmob_drm_crtc.c
@@ -271,6 +271,9 @@ static void shmob_drm_crtc_start(struct shmob_drm_crtc *scrtc)
 
 	shmob_drm_crtc_start_stop(scrtc, true);
 
+	/* Turn vertical blank interrupt reporting back on. */
+	drm_crtc_vblank_on(crtc);
+
 	scrtc->started = true;
 }
 
@@ -283,10 +286,12 @@ static void shmob_drm_crtc_stop(struct shmob_drm_crtc *scrtc)
 		return;
 
 	/*
-	 * Wait for page flip completion before stopping the CRTC as userspace
+	 * Disable vertical blank interrupt reporting.  We first need to wait
+	 * for page flip completion before stopping the CRTC as userspace
 	 * expects page flips to eventually complete.
 	 */
 	shmob_drm_crtc_wait_page_flip(scrtc);
+	drm_crtc_vblank_off(crtc);
 
 	/* Stop the LCDC. */
 	shmob_drm_crtc_start_stop(scrtc, false);
@@ -519,6 +524,9 @@ int shmob_drm_crtc_create(struct shmob_drm_device *sdev)
 
 	drm_crtc_helper_add(crtc, &crtc_helper_funcs);
 
+	/* Start with vertical blank interrupt reporting disabled. */
+	drm_crtc_vblank_off(crtc);
+
 	return 0;
 }
 
diff --git a/drivers/gpu/drm/renesas/shmobile/shmob_drm_drv.c b/drivers/gpu/drm/renesas/shmobile/shmob_drm_drv.c
index 2bd205f9ea72..c3a1995403d6 100644
--- a/drivers/gpu/drm/renesas/shmobile/shmob_drm_drv.c
+++ b/drivers/gpu/drm/renesas/shmobile/shmob_drm_drv.c
@@ -215,17 +215,17 @@ static int shmob_drm_probe(struct platform_device *pdev)
 	if (ret)
 		return ret;
 
-	ret = shmob_drm_modeset_init(sdev);
-	if (ret < 0)
-		return dev_err_probe(&pdev->dev, ret,
-				     "failed to initialize mode setting\n");
-
 	ret = drm_vblank_init(ddev, 1);
 	if (ret < 0) {
 		dev_err(&pdev->dev, "failed to initialize vblank\n");
-		goto err_modeset_cleanup;
+		return ret;
 	}
 
+	ret = shmob_drm_modeset_init(sdev);
+	if (ret < 0)
+		return dev_err_probe(&pdev->dev, ret,
+				     "failed to initialize mode setting\n");
+
 	ret = platform_get_irq(pdev, 0);
 	if (ret < 0)
 		goto err_modeset_cleanup;