linux-kernel - Re: [PATCH v2 1/2] media: i2c: imx219: Move out locking/unlocking of vflip and hflip controls from imx219_set

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Date:   Mon, 15 Mar 2021 02:02:41 +0200
From:   Laurent Pinchart <laurent.pinchart@...asonboard.com>
To:     Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>
Cc:     Dave Stevenson <dave.stevenson@...pberrypi.com>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Pavel Machek <pavel@...x.de>,
        Andrey Konovalov <andrey.konovalov@...aro.org>,
        Sakari Ailus <sakari.ailus@...ux.intel.com>,
        Jacopo Mondi <jacopo@...ndi.org>,
        Hans Verkuil <hverkuil-cisco@...all.nl>,
        linux-media@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-renesas-soc@...r.kernel.org,
        Prabhakar <prabhakar.csengg@...il.com>,
        Biju Das <biju.das.jz@...renesas.com>
Subject: Re: [PATCH v2 1/2] media: i2c: imx219: Move out locking/unlocking of
 vflip and hflip controls from imx219_set_stream

Hi Prabhakar,

Thank you for the patch.

On Thu, Mar 11, 2021 at 09:52:04AM +0000, Lad Prabhakar wrote:
> Move out locking/unlocking of vflip and hflip controls from
> imx219_set_stream() to the imx219_start_streaming()/
> imx219_stop_streaming() respectively.
> 
> This fixes an issue in resume callback error path where streaming is
> stopped and the controls are left in locked state.
> 
> Fixes: 1283b3b8f82b9 ("media: i2c: Add driver for Sony IMX219 sensor")
> Reported-by: Pavel Machek <pavel@...x.de>
> Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>

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

> ---
>  drivers/media/i2c/imx219.c | 19 +++++++++++++------
>  1 file changed, 13 insertions(+), 6 deletions(-)
> 
> diff --git a/drivers/media/i2c/imx219.c b/drivers/media/i2c/imx219.c
> index 6e3382b85a90..82756cbfbaac 100644
> --- a/drivers/media/i2c/imx219.c
> +++ b/drivers/media/i2c/imx219.c
> @@ -1056,8 +1056,16 @@ static int imx219_start_streaming(struct imx219 *imx219)
>  		return ret;
>  
>  	/* set stream on register */
> -	return imx219_write_reg(imx219, IMX219_REG_MODE_SELECT,
> -				IMX219_REG_VALUE_08BIT, IMX219_MODE_STREAMING);
> +	ret = imx219_write_reg(imx219, IMX219_REG_MODE_SELECT,
> +			       IMX219_REG_VALUE_08BIT, IMX219_MODE_STREAMING);
> +	if (ret)
> +		return ret;
> +
> +	/* vflip and hflip cannot change during streaming */
> +	__v4l2_ctrl_grab(imx219->vflip, true);
> +	__v4l2_ctrl_grab(imx219->hflip, true);
> +
> +	return 0;
>  }
>  
>  static void imx219_stop_streaming(struct imx219 *imx219)
> @@ -1070,6 +1078,9 @@ static void imx219_stop_streaming(struct imx219 *imx219)
>  			       IMX219_REG_VALUE_08BIT, IMX219_MODE_STANDBY);
>  	if (ret)
>  		dev_err(&client->dev, "%s failed to set stream\n", __func__);
> +
> +	__v4l2_ctrl_grab(imx219->vflip, false);
> +	__v4l2_ctrl_grab(imx219->hflip, false);
>  }
>  
>  static int imx219_set_stream(struct v4l2_subdev *sd, int enable)
> @@ -1105,10 +1116,6 @@ static int imx219_set_stream(struct v4l2_subdev *sd, int enable)
>  
>  	imx219->streaming = enable;
>  
> -	/* vflip and hflip cannot change during streaming */
> -	__v4l2_ctrl_grab(imx219->vflip, enable);
> -	__v4l2_ctrl_grab(imx219->hflip, enable);
> -
>  	mutex_unlock(&imx219->mutex);
>  
>  	return ret;

-- 
Regards,

Laurent Pinchart