Re: [PATCH 17/19] media: rcar-csi2: Store format in the subdev state

["Niklas Söderlund" <niklas.soderlund+renesas@ragnatech.se>]

Hi Jacpop,

Thanks for your work.

On 2024-04-30 12:39:53 +0200, Jacopo Mondi wrote:
> Store the format in the subdevice state. Disallow setting format
> on the source pads, as formats are set on the sink pad streams and
> propagated to the source streams.
> 
> Now that the driver doesn't store the active format in the
> driver-specific structure, also remove the mutex and use the lock
> associated with the state.

Can't this whole patch be broken out to an independent patch and 
upstreamed already independent from the streams work?

> 
> Signed-off-by: Jacopo Mondi <jacopo.mondi@ideasonboard.com>
> ---
>  drivers/media/platform/renesas/rcar-csi2.c | 54 +++++++---------------
>  1 file changed, 16 insertions(+), 38 deletions(-)
> 
> diff --git a/drivers/media/platform/renesas/rcar-csi2.c b/drivers/media/platform/renesas/rcar-csi2.c
> index ffb73272543b..ed818a6fa655 100644
> --- a/drivers/media/platform/renesas/rcar-csi2.c
> +++ b/drivers/media/platform/renesas/rcar-csi2.c
> @@ -621,8 +621,6 @@ struct rcar_csi2 {
>  
>  	int channel_vc[4];
>  
> -	struct mutex lock; /* Protects mf and stream_count. */
> -	struct v4l2_mbus_framefmt mf;
>  	int stream_count;
>  
>  	bool cphy;
> @@ -1263,43 +1261,28 @@ static int rcsi2_s_stream(struct v4l2_subdev *sd, int enable)
>  }
>  
>  static int rcsi2_set_pad_format(struct v4l2_subdev *sd,
> -				struct v4l2_subdev_state *sd_state,
> +				struct v4l2_subdev_state *state,
>  				struct v4l2_subdev_format *format)
>  {
> -	struct rcar_csi2 *priv = sd_to_csi2(sd);
> -	struct v4l2_mbus_framefmt *framefmt;
> +	struct v4l2_mbus_framefmt *fmt;
>  
> -	mutex_lock(&priv->lock);
> +	/*
> +	 * Format is propagated from sink streams to source streams, so
> +	 * disallow setting format on the source pads.
> +	 */
> +	if (format->pad > RCAR_CSI2_SINK)
> +		return -EINVAL;
>  
>  	if (!rcsi2_code_to_fmt(format->format.code))
>  		format->format.code = rcar_csi2_formats[0].code;
>  
> -	if (format->which == V4L2_SUBDEV_FORMAT_ACTIVE) {
> -		priv->mf = format->format;
> -	} else {
> -		framefmt = v4l2_subdev_state_get_format(sd_state, 0);
> -		*framefmt = format->format;
> -	}
>  
> -	mutex_unlock(&priv->lock);
> +	fmt = v4l2_subdev_state_get_format(state, format->pad, format->stream);
> +	*fmt = format->format;
>  
> -	return 0;
> -}
> -
> -static int rcsi2_get_pad_format(struct v4l2_subdev *sd,
> -				struct v4l2_subdev_state *sd_state,
> -				struct v4l2_subdev_format *format)
> -{
> -	struct rcar_csi2 *priv = sd_to_csi2(sd);
> -
> -	mutex_lock(&priv->lock);
> -
> -	if (format->which == V4L2_SUBDEV_FORMAT_ACTIVE)
> -		format->format = priv->mf;
> -	else
> -		format->format = *v4l2_subdev_state_get_format(sd_state, 0);
> -
> -	mutex_unlock(&priv->lock);
> +	fmt = v4l2_subdev_state_get_opposite_stream_format(state, format->pad,
> +							   format->stream);
> +	*fmt = format->format;
>  
>  	return 0;
>  }
> @@ -1310,7 +1293,7 @@ static const struct v4l2_subdev_video_ops rcar_csi2_video_ops = {
>  
>  static const struct v4l2_subdev_pad_ops rcar_csi2_pad_ops = {
>  	.set_fmt = rcsi2_set_pad_format,
> -	.get_fmt = rcsi2_get_pad_format,
> +	.get_fmt = v4l2_subdev_get_fmt,
>  };
>  
>  static const struct v4l2_subdev_ops rcar_csi2_subdev_ops = {
> @@ -2031,20 +2014,19 @@ static int rcsi2_probe(struct platform_device *pdev)
>  
>  	priv->dev = &pdev->dev;
>  
> -	mutex_init(&priv->lock);
>  	priv->stream_count = 0;
>  
>  	ret = rcsi2_probe_resources(priv, pdev);
>  	if (ret) {
>  		dev_err(priv->dev, "Failed to get resources\n");
> -		goto error_mutex;
> +		return ret;
>  	}
>  
>  	platform_set_drvdata(pdev, priv);
>  
>  	ret = rcsi2_parse_dt(priv);
>  	if (ret)
> -		goto error_mutex;
> +		return ret;
>  
>  	priv->subdev.owner = THIS_MODULE;
>  	priv->subdev.dev = &pdev->dev;
> @@ -2094,8 +2076,6 @@ static int rcsi2_probe(struct platform_device *pdev)
>  error_async:
>  	v4l2_async_nf_unregister(&priv->notifier);
>  	v4l2_async_nf_cleanup(&priv->notifier);
> -error_mutex:
> -	mutex_destroy(&priv->lock);
>  
>  	return ret;
>  }
> @@ -2110,8 +2090,6 @@ static void rcsi2_remove(struct platform_device *pdev)
>  	v4l2_subdev_cleanup(&priv->subdev);
>  
>  	pm_runtime_disable(&pdev->dev);
> -
> -	mutex_destroy(&priv->lock);
>  }
>  
>  static struct platform_driver rcar_csi2_pdrv = {
> -- 
> 2.44.0
> 

-- 
Kind Regards,
Niklas Söderlund