linux-kernel - Re: [PATCH] media: ov8856: Add runtime PM callbacks

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Message-ID: <Yyl7spRDgJ+R39Pj@valkosipuli.retiisi.eu>
Date:   Tue, 20 Sep 2022 11:37:06 +0300
From:   Sakari Ailus <sakari.ailus@....fi>
To:     Hidenori Kobayashi <hidenorik@...omium.org>
Cc:     Dongchun Zhu <dongchun.zhu@...iatek.com>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        linux-media@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] media: ov8856: Add runtime PM callbacks

Hi Hidenori,

On Tue, Sep 20, 2022 at 11:00:01AM +0900, Hidenori Kobayashi wrote:
> There were no runtime PM callbacks registered, leaving regulators being
> enabled while the device is suspended on DT systems. Calling existing
> power controlling functions from callbacks properly turn them off/on.
> 
> Signed-off-by: Hidenori Kobayashi <hidenorik@...omium.org>
> ---
>  drivers/media/i2c/ov8856.c | 21 +++++++++++++++++++++
>  1 file changed, 21 insertions(+)
> 
> diff --git a/drivers/media/i2c/ov8856.c b/drivers/media/i2c/ov8856.c
> index a9728afc81d4..3f57bc30b78b 100644
> --- a/drivers/media/i2c/ov8856.c
> +++ b/drivers/media/i2c/ov8856.c
> @@ -2200,6 +2200,26 @@ static int __maybe_unused ov8856_resume(struct device *dev)
>  	return 0;
>  }
>  
> +static int __maybe_unused ov8856_runtime_suspend(struct device *dev)
> +{
> +	struct i2c_client *client = to_i2c_client(dev);
> +	struct v4l2_subdev *sd = i2c_get_clientdata(client);
> +	struct ov8856 *ov8856 = to_ov8856(sd);
> +
> +	__ov8856_power_off(ov8856);

Could you refactor this a bit, changing the __ov8856_power_off() argument
to struct dev *?

> +
> +	return 0;
> +}
> +
> +static int __maybe_unused ov8856_runtime_resume(struct device *dev)
> +{
> +	struct i2c_client *client = to_i2c_client(dev);
> +	struct v4l2_subdev *sd = i2c_get_clientdata(client);
> +	struct ov8856 *ov8856 = to_ov8856(sd);
> +
> +	return __ov8856_power_on(ov8856);
> +}
> +
>  static int ov8856_set_format(struct v4l2_subdev *sd,
>  			     struct v4l2_subdev_state *sd_state,
>  			     struct v4l2_subdev_format *fmt)
> @@ -2540,6 +2560,7 @@ static int ov8856_probe(struct i2c_client *client)
>  
>  static const struct dev_pm_ops ov8856_pm_ops = {
>  	SET_SYSTEM_SLEEP_PM_OPS(ov8856_suspend, ov8856_resume)
> +	SET_RUNTIME_PM_OPS(ov8856_runtime_suspend, ov8856_runtime_resume, NULL)
>  };
>  
>  #ifdef CONFIG_ACPI

-- 
Kind regards,

Sakari Ailus