diff --git a/drivers/gpu/drm/rockchip/cdn-dp-core.c b/drivers/gpu/drm/rockchip/cdn-dp-core.c
index ce40f8516f22..dbf7581b36d9 100644
--- a/drivers/gpu/drm/rockchip/cdn-dp-core.c
+++ b/drivers/gpu/drm/rockchip/cdn-dp-core.c
@@ -1160,7 +1160,7 @@ static const struct component_ops cdn_dp_component_ops = {
 	.unbind = cdn_dp_unbind,
 };
 
-int cdn_dp_suspend(struct device *dev)
+static int cdn_dp_suspend(struct device *dev)
 {
 	struct cdn_dp_device *dp = dev_get_drvdata(dev);
 	int ret = 0;
@@ -1174,7 +1174,7 @@ int cdn_dp_suspend(struct device *dev)
 	return ret;
 }
 
-int cdn_dp_resume(struct device *dev)
+static int cdn_dp_resume(struct device *dev)
 {
 	struct cdn_dp_device *dp = dev_get_drvdata(dev);