Patch "dw9768: Enable low-power probe on ACPI" has been added to the 6.0-stable tree

[Sasha Levin <sashal@xxxxxxxxxx>]

This is a note to let you know that I've just added the patch titled

    dw9768: Enable low-power probe on ACPI

to the 6.0-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     dw9768-enable-low-power-probe-on-acpi.patch
and it can be found in the queue-6.0 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.



commit d4050c36a6d95b23904a4ac57c1f0a1a39ce308f
Author: Sakari Ailus <sakari.ailus@xxxxxxxxxxxxxxx>
Date:   Mon Oct 17 10:23:28 2022 +0300

    dw9768: Enable low-power probe on ACPI
    
    [ Upstream commit 5f9a089b6de34655318afe8e544d9a9cc0fc1d29 ]
    
    Add support for low-power probe to the driver. Also fix runtime PM API
    usage in the driver.
    
    Much of the hassle comes from different factors affecting device power
    states during probe for ACPI and DT.
    
    Signed-off-by: Sakari Ailus <sakari.ailus@xxxxxxxxxxxxxxx>
    Fixes: 859891228e56 ("media: i2c: dw9768: Add DW9768 VCM driver")
    Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>

diff --git a/drivers/media/i2c/dw9768.c b/drivers/media/i2c/dw9768.c
index c086580efac7..60ae0adf5174 100644
--- a/drivers/media/i2c/dw9768.c
+++ b/drivers/media/i2c/dw9768.c
@@ -414,6 +414,7 @@ static int dw9768_probe(struct i2c_client *client)
 {
 	struct device *dev = &client->dev;
 	struct dw9768 *dw9768;
+	bool full_power;
 	unsigned int i;
 	int ret;
 
@@ -469,13 +470,23 @@ static int dw9768_probe(struct i2c_client *client)
 
 	dw9768->sd.entity.function = MEDIA_ENT_F_LENS;
 
+	/*
+	 * Figure out whether we're going to power up the device here. Generally
+	 * this is done if CONFIG_PM is disabled in a DT system or the device is
+	 * to be powered on in an ACPI system. Similarly for power off in
+	 * remove.
+	 */
 	pm_runtime_enable(dev);
-	if (!pm_runtime_enabled(dev)) {
+	full_power = (is_acpi_node(dev_fwnode(dev)) &&
+		      acpi_dev_state_d0(dev)) ||
+		     (is_of_node(dev_fwnode(dev)) && !pm_runtime_enabled(dev));
+	if (full_power) {
 		ret = dw9768_runtime_resume(dev);
 		if (ret < 0) {
 			dev_err(dev, "failed to power on: %d\n", ret);
 			goto err_clean_entity;
 		}
+		pm_runtime_set_active(dev);
 	}
 
 	ret = v4l2_async_register_subdev(&dw9768->sd);
@@ -484,14 +495,17 @@ static int dw9768_probe(struct i2c_client *client)
 		goto err_power_off;
 	}
 
+	pm_runtime_idle(dev);
+
 	return 0;
 
 err_power_off:
-	if (pm_runtime_enabled(dev))
-		pm_runtime_disable(dev);
-	else
+	if (full_power) {
 		dw9768_runtime_suspend(dev);
+		pm_runtime_set_suspended(dev);
+	}
 err_clean_entity:
+	pm_runtime_disable(dev);
 	media_entity_cleanup(&dw9768->sd.entity);
 err_free_handler:
 	v4l2_ctrl_handler_free(&dw9768->ctrls);
@@ -503,14 +517,17 @@ static int dw9768_remove(struct i2c_client *client)
 {
 	struct v4l2_subdev *sd = i2c_get_clientdata(client);
 	struct dw9768 *dw9768 = sd_to_dw9768(sd);
+	struct device *dev = &client->dev;
 
 	v4l2_async_unregister_subdev(&dw9768->sd);
 	v4l2_ctrl_handler_free(&dw9768->ctrls);
 	media_entity_cleanup(&dw9768->sd.entity);
-	pm_runtime_disable(&client->dev);
-	if (!pm_runtime_status_suspended(&client->dev))
-		dw9768_runtime_suspend(&client->dev);
-	pm_runtime_set_suspended(&client->dev);
+	if ((is_acpi_node(dev_fwnode(dev)) && acpi_dev_state_d0(dev)) ||
+	    (is_of_node(dev_fwnode(dev)) && !pm_runtime_enabled(dev))) {
+		dw9768_runtime_suspend(dev);
+		pm_runtime_set_suspended(dev);
+	}
+	pm_runtime_disable(dev);
 
 	return 0;
 }