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Subject: media: ov01a10: Enable runtime PM before registering async sub-device Author: Bingbu Cao bingbu.cao@intel.com Date: Wed Nov 22 17:46:07 2023 +0800
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
drivers/media/i2c/ov01a10.c | 18 ++++++++++++++---- 1 file changed, 14 insertions(+), 4 deletions(-)
---
diff --git a/drivers/media/i2c/ov01a10.c b/drivers/media/i2c/ov01a10.c index 7cca9294ea31..5606437f37d0 100644 --- a/drivers/media/i2c/ov01a10.c +++ b/drivers/media/i2c/ov01a10.c @@ -862,6 +862,7 @@ 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) @@ -909,17 +910,26 @@ 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);