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

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Date:   Mon, 11 Dec 2023 20:19:35 +0200
From:   Laurent Pinchart <laurent.pinchart@...asonboard.com>
To:     Mikhail Rudenko <mike.rudenko@...il.com>
Cc:     linux-media@...r.kernel.org, linux-kernel@...r.kernel.org,
        Sakari Ailus <sakari.ailus@...ux.intel.com>,
        Jacopo Mondi <jacopo@...ndi.org>,
        Tommaso Merciai <tommaso.merciai@...rulasolutions.com>,
        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

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.

> 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 ?

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

-- 
Regards,

Laurent Pinchart