media: ov01a10: Enable runtime PM before registering async sub-device

commit 47a78052db51b16e8045524fbf33373b58f1323b upstream.

As the sensor device maybe accessible right after its async sub-device is
registered, such as ipu-bridge will try to power up sensor by sensor's
client device's runtime PM from the async notifier callback, if runtime PM
is not enabled, it will fail.

So runtime PM should be ready before its async sub-device is registered
and accessible by others.

It also sets the runtime PM status to active as the sensor was turned
on by i2c-core.

Fixes: 0827b58dabff ("media: i2c: add ov01a10 image sensor driver")
Cc: stable@vger.kernel.org
Signed-off-by: Bingbu Cao <bingbu.cao@intel.com>
Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/media/i2c/ov01a10.c b/drivers/media/i2c/ov01a10.c
index 2b9e1b3..9afe9bf 100644 (file)
--- a/drivers/media/i2c/ov01a10.c
+++ b/drivers/media/i2c/ov01a10.c
@@ -907,6 +907,7 @@ static void ov01a10_remove(struct i2c_client *client)
        v4l2_ctrl_handler_free(sd->ctrl_handler);
 
        pm_runtime_disable(&client->dev);
+       pm_runtime_set_suspended(&client->dev);
 }
 
 static int ov01a10_probe(struct i2c_client *client)
@@ -953,17 +954,26 @@ static int ov01a10_probe(struct i2c_client *client)
                goto err_media_entity_cleanup;
        }
 
+       /*
+        * Device is already turned on by i2c-core with ACPI domain PM.
+        * Enable runtime PM and turn off the device.
+        */
+       pm_runtime_set_active(&client->dev);
+       pm_runtime_enable(dev);
+       pm_runtime_idle(dev);
+
        ret = v4l2_async_register_subdev_sensor(&ov01a10->sd);
        if (ret < 0) {
                dev_err(dev, "Failed to register subdev: %d\n", ret);
-               goto err_media_entity_cleanup;
+               goto err_pm_disable;
        }
 
-       pm_runtime_enable(dev);
-       pm_runtime_idle(dev);
-
        return 0;
 
+err_pm_disable:
+       pm_runtime_disable(dev);
+       pm_runtime_set_suspended(&client->dev);
+
 err_media_entity_cleanup:
        media_entity_cleanup(&ov01a10->sd.entity);