diff --git a/drivers/devfreq/rockchip_dmc.c b/drivers/devfreq/rockchip_dmc.c
index 3f81a90d0a86..65d4c9a2420a 100644
--- a/drivers/devfreq/rockchip_dmc.c
+++ b/drivers/devfreq/rockchip_dmc.c
@@ -691,14 +691,13 @@ static int rk_drm_get_lcdc_type(void)
 	if (drm) {
 		struct drm_connector *conn;
 
-		drm_modeset_lock(&drm->mode_config.connection_mutex, NULL);
-		drm_for_each_connector(conn, drm) {
+		list_for_each_entry(conn, &drm->mode_config.connector_list,
+				    head) {
 			if (conn->encoder) {
 				lcdc_type = conn->connector_type;
 				break;
 			}
 		}
-		drm_modeset_unlock(&drm->mode_config.connection_mutex);
 	}
 	switch (lcdc_type) {
 	case DRM_MODE_CONNECTOR_LVDS: