1 files changed, 2 insertions, 0 deletions

diff --git a/drivers/gpu/drm/msm/mdp/mdp4/mdp4_crtc.c b/drivers/gpu/drm/msm/mdp/mdp4/mdp4_crtc.c
index f9bc0ef8b836..7d00f7fb5773 100644
--- a/drivers/gpu/drm/msm/mdp/mdp4/mdp4_crtc.c
+++ b/drivers/gpu/drm/msm/mdp/mdp4/mdp4_crtc.c
@@ -402,6 +402,7 @@ static void mdp4_crtc_prepare(struct drm_crtc *crtc)
         struct mdp4_crtc *mdp4_crtc = to_mdp4_crtc(crtc);
         DBG("%s", mdp4_crtc->name);
         /* make sure we hold a ref to mdp clks while setting up mode: */
+        drm_crtc_vblank_get(crtc);
         mdp4_enable(get_kms(crtc));
         mdp4_crtc_dpms(crtc, DRM_MODE_DPMS_OFF);
 }
@@ -412,6 +413,7 @@ static void mdp4_crtc_commit(struct drm_crtc *crtc)
         crtc_flush(crtc);
         /* drop the ref to mdp clk's that we got in prepare: */
         mdp4_disable(get_kms(crtc));
+        drm_crtc_vblank_put(crtc);
 }
 
 static int mdp4_crtc_mode_set_base(struct drm_crtc *crtc, int x, int y,