diff --git a/drivers/gpu/drm/tilcdc/tilcdc_drv.c b/drivers/gpu/drm/tilcdc/tilcdc_drv.c
index 1981ae9c80a1d57958075f7c8eb2d9211157f71e..4b93cab911685e2c9e714e699d7493508705e686 100644
--- a/drivers/gpu/drm/tilcdc/tilcdc_drv.c
+++ b/drivers/gpu/drm/tilcdc/tilcdc_drv.c
@@ -75,8 +75,8 @@ static void tilcdc_fb_output_poll_changed(struct drm_device *dev)
 	drm_fbdev_cma_hotplug_event(priv->fbdev);
 }
 
-int tilcdc_atomic_check(struct drm_device *dev,
-			struct drm_atomic_state *state)
+static int tilcdc_atomic_check(struct drm_device *dev,
+			       struct drm_atomic_state *state)
 {
 	int ret;