diff --git a/drivers/clk/rockchip/clk-ddr.c b/drivers/clk/rockchip/clk-ddr.c
index 09b4b3638f11..d1d71c05a119 100644
--- a/drivers/clk/rockchip/clk-ddr.c
+++ b/drivers/clk/rockchip/clk-ddr.c
@@ -14,6 +14,7 @@
  */
 
 #include <drm/drmP.h>
+#include <drm/drm_modeset_lock.h>
 #include <dt-bindings/display/rk_fb.h>
 #include <linux/arm-smccc.h>
 #include <linux/clk.h>
@@ -52,14 +53,14 @@ static int rk_drm_get_lcdc_type(void)
 	if (drm) {
 		struct drm_connector *conn;
 
-		mutex_lock(&drm->mode_config.mutex);
+		drm_modeset_lock(&drm->mode_config.connection_mutex, NULL);
 		drm_for_each_connector(conn, drm) {
 			if (conn->encoder) {
 				lcdc_type = conn->connector_type;
 				break;
 			}
 		}
-		mutex_unlock(&drm->mode_config.mutex);
+		drm_modeset_unlock(&drm->mode_config.connection_mutex);
 	}
 
 	switch (lcdc_type) {