linux-kernel - Re: [PATCH v3 09/20] media: i2c: ov4689: Use runtime PM autosuspend

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Message-ID: <20240304204510.GD9233@pendragon.ideasonboard.com>
Date: Mon, 4 Mar 2024 22:45:10 +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 <tomm.merciai@...il.com>,
	Christophe JAILLET <christophe.jaillet@...adoo.fr>,
	Dave Stevenson <dave.stevenson@...pberrypi.com>,
	Mauro Carvalho Chehab <mchehab@...nel.org>
Subject: Re: [PATCH v3 09/20] media: i2c: ov4689: Use runtime PM autosuspend

Hi Mikhail,

Thank you for the patch.

On Thu, Feb 29, 2024 at 07:53:22PM +0300, Mikhail Rudenko wrote:
> Use runtime PM autosuspend to avoid powering off the sensor during
> fast stop-reconfigure-restart cycles.
> 
> Signed-off-by: Mikhail Rudenko <mike.rudenko@...il.com>

Reviewed-by: Laurent Pinchart <laurent.pinchart@...asonboard.com>

> ---
>  drivers/media/i2c/ov4689.c | 15 +++++++++++----
>  1 file changed, 11 insertions(+), 4 deletions(-)
> 
> diff --git a/drivers/media/i2c/ov4689.c b/drivers/media/i2c/ov4689.c
> index 0e0e694510aa..2354397ab34c 100644
> --- a/drivers/media/i2c/ov4689.c
> +++ b/drivers/media/i2c/ov4689.c
> @@ -426,7 +426,8 @@ static int ov4689_s_stream(struct v4l2_subdev *sd, int on)
>  	} else {
>  		cci_write(ov4689->regmap, OV4689_REG_CTRL_MODE,
>  			  OV4689_MODE_SW_STANDBY, NULL);
> -		pm_runtime_put(dev);
> +		pm_runtime_mark_last_busy(dev);
> +		pm_runtime_put_autosuspend(dev);
>  	}
>  
>  unlock_and_return:
> @@ -606,7 +607,8 @@ static int ov4689_set_ctrl(struct v4l2_ctrl *ctrl)
>  		break;
>  	}
>  
> -	pm_runtime_put(dev);
> +	pm_runtime_mark_last_busy(dev);
> +	pm_runtime_put_autosuspend(dev);
>  
>  	return ret;
>  }
> @@ -876,8 +878,10 @@ static int ov4689_probe(struct i2c_client *client)
>  	}
>  
>  	pm_runtime_set_active(dev);
> +	pm_runtime_get_noresume(dev);
>  	pm_runtime_enable(dev);
> -	pm_runtime_idle(dev);
> +	pm_runtime_set_autosuspend_delay(dev, 1000);
> +	pm_runtime_use_autosuspend(dev);
>  
>  	ret = v4l2_async_register_subdev_sensor(sd);
>  	if (ret) {
> @@ -885,11 +889,14 @@ static int ov4689_probe(struct i2c_client *client)
>  		goto err_clean_subdev_pm;
>  	}
>  
> +	pm_runtime_mark_last_busy(dev);
> +	pm_runtime_put_autosuspend(dev);
> +
>  	return 0;
>  
>  err_clean_subdev_pm:
>  	pm_runtime_disable(dev);
> -	pm_runtime_set_suspended(dev);
> +	pm_runtime_put_noidle(dev);
>  	v4l2_subdev_cleanup(sd);
>  err_clean_entity:
>  	media_entity_cleanup(&sd->entity);

-- 
Regards,

Laurent Pinchart