linux-kernel - Re: [PATCH 08/19] media: i2c: ov4689: Enable runtime PM before registering sub-device

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Message-ID: <87plzbppgq.fsf@gmail.com>
Date:   Tue, 12 Dec 2023 15:32:31 +0300
From:   Mikhail Rudenko <mike.rudenko@...il.com>
To:     Laurent Pinchart <laurent.pinchart@...asonboard.com>
Cc:     linux-media@...r.kernel.org, linux-kernel@...r.kernel.org,
        Sakari Ailus <sakari.ailus@...ux.intel.com>,
        Jacopo Mondi <jacopo@...ndi.org>,
        Christophe JAILLET <christophe.jaillet@...adoo.fr>,
        Dave Stevenson <dave.stevenson@...pberrypi.com>,
        Mauro Carvalho Chehab <mchehab@...nel.org>
Subject: Re: [PATCH 08/19] media: i2c: ov4689: Enable runtime PM before
 registering sub-device


On 2023-12-11 at 20:19 +02, Laurent Pinchart <laurent.pinchart@...asonboard.com> wrote:

> Hi Mikhail,
>
> Thank you for the patch.
>
> On Mon, Dec 11, 2023 at 08:50:11PM +0300, Mikhail Rudenko wrote:
>> As the sensor may be accessible right after its async sub-device is
>> registered, enable runtime PM before doing so.
>
> While at it, could you also switch to runtime PM autosuspend, possibly
> in a separate patch ? See for instance the imx290 driver.

I actually had a plan to do this in this series, but it had grown a
little bigger then expected and I had to drop a few non-essential
patches, including PM autosuspend. But if you suggest, I'll bring in
back in v2.

>> Signed-off-by: Mikhail Rudenko <mike.rudenko@...il.com>
>> ---
>>  drivers/media/i2c/ov4689.c | 8 ++++----
>>  1 file changed, 4 insertions(+), 4 deletions(-)
>>
>> diff --git a/drivers/media/i2c/ov4689.c b/drivers/media/i2c/ov4689.c
>> index 2eef64cd0070..ba33b0ced532 100644
>> --- a/drivers/media/i2c/ov4689.c
>> +++ b/drivers/media/i2c/ov4689.c
>> @@ -874,16 +874,16 @@ static int ov4689_probe(struct i2c_client *client)
>>  		goto err_clean_entity;
>>  	}
>>
>> +	pm_runtime_set_active(dev);
>> +	pm_runtime_enable(dev);
>> +	pm_runtime_idle(dev);
>> +
>>  	ret = v4l2_async_register_subdev_sensor(sd);
>>  	if (ret) {
>>  		dev_err(dev, "v4l2 async register subdev failed\n");
>>  		goto err_clean_subdev;
>
> Don't you need to disable runtime PM in the error path ?

Ack, will improve error in v2.

>>  	}
>>
>> -	pm_runtime_set_active(dev);
>> -	pm_runtime_enable(dev);
>> -	pm_runtime_idle(dev);
>> -
>>  	return 0;
>>
>>  err_clean_subdev:


--
Best regards,
Mikhail Rudenko