drm/tegra: Mark Tegra186 display hub PM functions __maybe_unused

The newly introduced driver has optional suspend/resume functions,
causing a warning when CONFIG_PM is disabled:

drivers/gpu/drm/tegra/hub.c:749:12: error: 'tegra_display_hub_resume' defined but not used [-Werror=unused-function]
drivers/gpu/drm/tegra/hub.c:733:12: error: 'tegra_display_hub_suspend' defined but not used [-Werror=unused-function]

This marks them __maybe_unused to shut up the warnings.

Fixes: c4755fb9064f ("drm/tegra: Add Tegra186 display hub support")
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Thierry Reding <treding@nvidia.com>

1 files changed, 2 insertions, 2 deletions

diff --git a/drivers/gpu/drm/tegra/hub.c b/drivers/gpu/drm/tegra/hub.c
index 90bcf24b1523..e10a47d57313 100644
--- a/drivers/gpu/drm/tegra/hub.c
+++ b/drivers/gpu/drm/tegra/hub.c
@@ -728,7 +728,7 @@ static int tegra_display_hub_remove(struct platform_device *pdev)
         return err;
 }
 
-static int tegra_display_hub_suspend(struct device *dev)
+static int __maybe_unused tegra_display_hub_suspend(struct device *dev)
 {
         struct tegra_display_hub *hub = dev_get_drvdata(dev);
         int err;
@@ -744,7 +744,7 @@ static int tegra_display_hub_suspend(struct device *dev)
         return 0;
 }
 
-static int tegra_display_hub_resume(struct device *dev)
+static int __maybe_unused tegra_display_hub_resume(struct device *dev)
 {
         struct tegra_display_hub *hub = dev_get_drvdata(dev);
         int err;