If CONFIG_PM is not set, gcc warns:

drivers/gpu/drm/rockchip/cdn-dp-core.c:1124:12:
 warning: ‘cdn_dp_resume’ defined but not used [-Wunused-function]

Mark them __maybe_unused to fix this.

Reported-by: Hulk Robot <redacted>
Signed-off-by: YueHaibing <redacted>
---
 drivers/gpu/drm/rockchip/cdn-dp-core.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/rockchip/cdn-dp-core.c b/drivers/gpu/drm/rockchip/cdn-dp-core.c
index a4a45daf93f2..413b0e90f10f 100644
--- a/drivers/gpu/drm/rockchip/cdn-dp-core.c
+++ b/drivers/gpu/drm/rockchip/cdn-dp-core.c

@@ -1107,7 +1107,7 @@ static const struct component_ops cdn_dp_component_ops = {
 	.unbind = cdn_dp_unbind,
 };
 
-static int cdn_dp_suspend(struct device *dev)
+static __maybe_unused int cdn_dp_suspend(struct device *dev)
 {
 	struct cdn_dp_device *dp = dev_get_drvdata(dev);
 	int ret = 0;

@@ -1121,7 +1121,7 @@ static int cdn_dp_suspend(struct device *dev)
 	return ret;
 }
 
-static int cdn_dp_resume(struct device *dev)
+static __maybe_unused int cdn_dp_resume(struct device *dev)
 {
 	struct cdn_dp_device *dp = dev_get_drvdata(dev);