linux-kernel - Re: [PATCH] media: ov5640: Update last busy timestamp to reset autosuspend timer

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Message-ID: <Y8KgGhu0e/+xIfDm@valkosipuli.retiisi.eu>
Date:   Sat, 14 Jan 2023 14:29:14 +0200
From:   Sakari Ailus <sakari.ailus@....fi>
To:     Andrey Skvortsov <andrej.skvortzov@...il.com>
Cc:     Steve Longerbeam <slongerbeam@...il.com>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        linux-media@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] media: ov5640: Update last busy timestamp to reset
 autosuspend timer

Hi Andrey,

On Sat, Jan 14, 2023 at 02:21:09PM +0300, Andrey Skvortsov wrote:
> Otherwise autosuspend delay doesn't work and power is cut off
> immediately as device is freed.
> 
> Signed-off-by: Andrey Skvortsov <andrej.skvortzov@...il.com>
> ---
>  drivers/media/i2c/ov5640.c | 9 ++++++++-
>  1 file changed, 8 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/media/i2c/ov5640.c b/drivers/media/i2c/ov5640.c
> index ac35350..f71c0f7 100644
> --- a/drivers/media/i2c/ov5640.c
> +++ b/drivers/media/i2c/ov5640.c
> @@ -1238,6 +1238,7 @@ static int ov5640_write_reg(struct ov5640_dev *sensor, u16 reg, u8 val)
>  		return ret;
>  	}
>  
> +	pm_runtime_mark_last_busy(&sensor->i2c_client->dev);
>  	return 0;
>  }
>  
> @@ -1305,6 +1306,7 @@ static int ov5640_read_reg(struct ov5640_dev *sensor, u16 reg, u8 *val)
>  	}
>  
>  	*val = buf[0];
> +	pm_runtime_mark_last_busy(&sensor->i2c_client->dev);

I wouldn't add these calls to register accesses. It's generally relevant
with autosuspend_put().

The rest seems fine to me.

>  	return 0;
>  }
>  
> @@ -3615,6 +3617,7 @@ static int ov5640_g_volatile_ctrl(struct v4l2_ctrl *ctrl)
>  		break;
>  	}
>  
> +	pm_runtime_mark_last_busy(&sensor->i2c_client->dev);
>  	pm_runtime_put_autosuspend(&sensor->i2c_client->dev);
>  
>  	return 0;
> @@ -3702,6 +3705,7 @@ static int ov5640_s_ctrl(struct v4l2_ctrl *ctrl)
>  		break;
>  	}
>  
> +	pm_runtime_mark_last_busy(&sensor->i2c_client->dev);
>  	pm_runtime_put_autosuspend(&sensor->i2c_client->dev);
>  
>  	return ret;
> @@ -4034,8 +4038,10 @@ static int ov5640_s_stream(struct v4l2_subdev *sd, int enable)
>  out:
>  	mutex_unlock(&sensor->lock);
>  
> -	if (!enable || ret)
> +	if (!enable || ret) {
> +		pm_runtime_mark_last_busy(&sensor->i2c_client->dev);
>  		pm_runtime_put_autosuspend(&sensor->i2c_client->dev);
> +	}
>  
>  	return ret;
>  }
> @@ -4203,6 +4209,7 @@ static int ov5640_probe(struct i2c_client *client)
>  
>  	pm_runtime_set_autosuspend_delay(dev, 1000);
>  	pm_runtime_use_autosuspend(dev);
> +	pm_runtime_mark_last_busy(dev);
>  	pm_runtime_put_autosuspend(dev);
>  
>  	return 0;

-- 
Kind regards,

Sakari Ailus