[PATCH v3] media: ov8856: Add runtime PM callbacks

[Hidenori Kobayashi <hidenorik@xxxxxxxxxxxx>]

There were no runtime PM callbacks registered, leaving regulators being
enabled while the device is suspended on DT systems. Adjust and register
existing power controlling functions to turn them off/on.

Signed-off-by: Hidenori Kobayashi <hidenorik@xxxxxxxxxxxx>
---
V2 -> V3: Remove redundant wrappers (were added in V1)
V1 -> V2: Change argument of power controlling functions
---
 drivers/media/i2c/ov8856.c | 33 +++++++++++++++++++--------------
 1 file changed, 19 insertions(+), 14 deletions(-)

diff --git a/drivers/media/i2c/ov8856.c b/drivers/media/i2c/ov8856.c
index a9728afc81d4..760611ee5485 100644
--- a/drivers/media/i2c/ov8856.c
+++ b/drivers/media/i2c/ov8856.c
@@ -2110,17 +2110,18 @@ static int ov8856_set_stream(struct v4l2_subdev *sd, int enable)
 	return ret;
 }
 
-static int __ov8856_power_on(struct ov8856 *ov8856)
+static int ov8856_power_on(struct device *dev)
 {
-	struct i2c_client *client = v4l2_get_subdevdata(&ov8856->sd);
+	struct v4l2_subdev *sd = dev_get_drvdata(dev);
+	struct ov8856 *ov8856 = to_ov8856(sd);
 	int ret;
 
-	if (is_acpi_node(dev_fwnode(&client->dev)))
+	if (is_acpi_node(dev_fwnode(dev)))
 		return 0;
 
 	ret = clk_prepare_enable(ov8856->xvclk);
 	if (ret < 0) {
-		dev_err(&client->dev, "failed to enable xvclk\n");
+		dev_err(dev, "failed to enable xvclk\n");
 		return ret;
 	}
 
@@ -2132,7 +2133,7 @@ static int __ov8856_power_on(struct ov8856 *ov8856)
 	ret = regulator_bulk_enable(ARRAY_SIZE(ov8856_supply_names),
 				    ov8856->supplies);
 	if (ret < 0) {
-		dev_err(&client->dev, "failed to enable regulators\n");
+		dev_err(dev, "failed to enable regulators\n");
 		goto disable_clk;
 	}
 
@@ -2148,17 +2149,20 @@ static int __ov8856_power_on(struct ov8856 *ov8856)
 	return ret;
 }
 
-static void __ov8856_power_off(struct ov8856 *ov8856)
+static int ov8856_power_off(struct device *dev)
 {
-	struct i2c_client *client = v4l2_get_subdevdata(&ov8856->sd);
+	struct v4l2_subdev *sd = dev_get_drvdata(dev);
+	struct ov8856 *ov8856 = to_ov8856(sd);
 
-	if (is_acpi_node(dev_fwnode(&client->dev)))
-		return;
+	if (is_acpi_node(dev_fwnode(dev)))
+		return 0;
 
 	gpiod_set_value_cansleep(ov8856->reset_gpio, 1);
 	regulator_bulk_disable(ARRAY_SIZE(ov8856_supply_names),
 			       ov8856->supplies);
 	clk_disable_unprepare(ov8856->xvclk);
+
+	return 0;
 }
 
 static int __maybe_unused ov8856_suspend(struct device *dev)
@@ -2170,7 +2174,7 @@ static int __maybe_unused ov8856_suspend(struct device *dev)
 	if (ov8856->streaming)
 		ov8856_stop_streaming(ov8856);
 
-	__ov8856_power_off(ov8856);
+	ov8856_power_off(dev);
 	mutex_unlock(&ov8856->mutex);
 
 	return 0;
@@ -2184,7 +2188,7 @@ static int __maybe_unused ov8856_resume(struct device *dev)
 
 	mutex_lock(&ov8856->mutex);
 
-	__ov8856_power_on(ov8856);
+	ov8856_power_on(dev);
 	if (ov8856->streaming) {
 		ret = ov8856_start_streaming(ov8856);
 		if (ret) {
@@ -2451,7 +2455,7 @@ static int ov8856_remove(struct i2c_client *client)
 	pm_runtime_disable(&client->dev);
 	mutex_destroy(&ov8856->mutex);
 
-	__ov8856_power_off(ov8856);
+	ov8856_power_off(&client->dev);
 
 	return 0;
 }
@@ -2477,7 +2481,7 @@ static int ov8856_probe(struct i2c_client *client)
 
 	full_power = acpi_dev_state_d0(&client->dev);
 	if (full_power) {
-		ret = __ov8856_power_on(ov8856);
+		ret = ov8856_power_on(&client->dev);
 		if (ret) {
 			dev_err(&client->dev, "failed to power on\n");
 			return ret;
@@ -2533,13 +2537,14 @@ static int ov8856_probe(struct i2c_client *client)
 	mutex_destroy(&ov8856->mutex);
 
 probe_power_off:
-	__ov8856_power_off(ov8856);
+	ov8856_power_off(&client->dev);
 
 	return ret;
 }
 
 static const struct dev_pm_ops ov8856_pm_ops = {
 	SET_SYSTEM_SLEEP_PM_OPS(ov8856_suspend, ov8856_resume)
+	SET_RUNTIME_PM_OPS(ov8856_power_off, ov8856_power_on, NULL)
 };
 
 #ifdef CONFIG_ACPI
-- 
2.37.3.968.ga6b4b080e4-goog