[PATCH 5/9] drm/tegra: sor: Implement system suspend/resume

Thierry Reding
2019-11-28T15:37:37Z

From: Thierry Reding <treding@nvidia.com>

Upon system suspend, make sure the +5V HDMI regulator is disabled. This
avoids potentially leaking current to the HDMI connector. This also
makes sure that upon resume the regulator is enabled again, which in
some cases is necessary to properly restore the state of the supply on
resume.

Signed-off-by: Thierry Reding <treding@nvidia.com>
---
drivers/gpu/drm/tegra/sor.c | 24 +++++++++++++++++++-----
1 file changed, 19 insertions(+), 5 deletions(-)

diff --git a/drivers/gpu/drm/tegra/sor.c b/drivers/gpu/drm/tegra/sor.c
index 615cb319fa8b..2200f4cd397a 100644
--- a/drivers/gpu/drm/tegra/sor.c
+++ b/drivers/gpu/drm/tegra/sor.c
@@ -3912,8 +3912,7 @@ static int tegra_sor_remove(struct platform_device *pdev)
return 0;
}

-#ifdef CONFIG_PM
-static int tegra_sor_suspend(struct device *dev)
+static int tegra_sor_runtime_suspend(struct device *dev)
{
struct tegra_sor *sor = dev_get_drvdata(dev);
int err;
@@ -3935,7 +3934,7 @@ static int tegra_sor_suspend(struct device *dev)
return 0;
}

-static int tegra_sor_resume(struct device *dev)
+static int tegra_sor_runtime_resume(struct device *dev)
{
struct tegra_sor *sor = dev_get_drvdata(dev);
int err;
@@ -3967,10 +3966,25 @@ static int tegra_sor_resume(struct device *dev)

return 0;
}
-#endif
+
+static int tegra_sor_suspend(struct device *dev)
+{
+ struct tegra_sor *sor = dev_get_drvdata(dev);
+
+ return regulator_disable(sor->hdmi_supply);
+}
+
+static int tegra_sor_resume(struct device *dev)
+{
+ struct tegra_sor *sor = dev_get_drvdata(dev);
+
+ return regulator_enable(sor->hdmi_supply);
+}

static const struct dev_pm_ops tegra_sor_pm_ops = {
- SET_RUNTIME_PM_OPS(tegra_sor_suspend, tegra_sor_resume, NULL)
+ SET_RUNTIME_PM_OPS(tegra_sor_runtime_suspend, tegra_sor_runtime_resume,
+ NULL)
+ SET_SYSTEM_SLEEP_PM_OPS(tegra_sor_suspend, tegra_sor_resume)
};

struct platform_driver tegra_sor_driver = {
--
2.23.0