Fixes the following sparse warning:
drivers/gpu/drm/tilcdc/tilcdc_drv.c:64:5: warning:
 symbol 'tilcdc_atomic_check' was not declared. Should it be static?
Signed-off-by: Wei Yongjun <weiyongjun1@huawei.com>
Signed-off-by: Jyri Sarha <jsarha@ti.com>
        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;