Re: [PATCH v6 10/11] media: rcar-csi2: Add full streams support

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

Hi Tomi,

Thanks for your patch.

On 2026-06-17 14:55:03 +0300, Tomi Valkeinen wrote:
> Add the missing pieces to enable full streams support:
> 
> - Add set_routing
> - Drop the explicit uses of a single stream, and instead use the streams
>   mask
> - Track enabled sink streams so that in rcsi2_irq_thread() we can
>   disable and enable all currently enabled streams
> 
> Signed-off-by: Tomi Valkeinen <tomi.valkeinen+renesas@ideasonboard.com>

Reviewed-by: Niklas Söderlund <niklas.soderlund+renesas@ragnatech.se>

> ---
>  drivers/media/platform/renesas/rcar-csi2.c | 95 ++++++++++++++++++++----------
>  1 file changed, 64 insertions(+), 31 deletions(-)
> 
> diff --git a/drivers/media/platform/renesas/rcar-csi2.c b/drivers/media/platform/renesas/rcar-csi2.c
> index 8cd38b4cbc7f..34899e5409da 100644
> --- a/drivers/media/platform/renesas/rcar-csi2.c
> +++ b/drivers/media/platform/renesas/rcar-csi2.c
> @@ -702,6 +702,17 @@ static const struct rcar_csi2_format rcar_csi2_formats[] = {
>  	},
>  };
>  
> +static const struct v4l2_mbus_framefmt rcar_csi2_default_fmt = {
> +	.width		= 1920,
> +	.height		= 1080,
> +	.code		= MEDIA_BUS_FMT_RGB888_1X24,
> +	.colorspace	= V4L2_COLORSPACE_SRGB,
> +	.field		= V4L2_FIELD_NONE,
> +	.ycbcr_enc	= V4L2_YCBCR_ENC_DEFAULT,
> +	.quantization	= V4L2_QUANTIZATION_DEFAULT,
> +	.xfer_func	= V4L2_XFER_FUNC_DEFAULT,
> +};
> +
>  static const struct rcar_csi2_format *rcsi2_code_to_fmt(unsigned int code)
>  {
>  	unsigned int i;
> @@ -773,7 +784,7 @@ struct rcar_csi2 {
>  
>  	int channel_vc[4];
>  
> -	int stream_count;
> +	u64 enabled_sink_streams_mask;
>  
>  	bool cphy;
>  	unsigned short lanes;
> @@ -1883,29 +1894,32 @@ static int rcsi2_enable_streams(struct v4l2_subdev *sd,
>  				u64 source_streams_mask)
>  {
>  	struct rcar_csi2 *priv = sd_to_csi2(sd);
> -	int ret = 0;
> -
> -	if (source_streams_mask != 1)
> -		return -EINVAL;
> +	u64 sink_streams;
> +	int ret;
>  
>  	if (!priv->remote)
>  		return -ENODEV;
>  
> -	if (priv->stream_count == 0) {
> +	if (!priv->enabled_sink_streams_mask) {
>  		ret = rcsi2_start(priv, state);
>  		if (ret)
>  			return ret;
>  	}
>  
> +	sink_streams = v4l2_subdev_state_xlate_streams(state,
> +						       source_pad,
> +						       RCAR_CSI2_SINK,
> +						       &source_streams_mask);
> +
>  	ret = v4l2_subdev_enable_streams(priv->remote, priv->remote_pad,
> -					 BIT_ULL(0));
> +					 sink_streams);
>  	if (ret) {
> -		if (priv->stream_count == 0)
> +		if (!priv->enabled_sink_streams_mask)
>  			rcsi2_stop(priv);
>  		return ret;
>  	}
>  
> -	priv->stream_count += 1;
> +	priv->enabled_sink_streams_mask |= sink_streams;
>  
>  	return ret;
>  }
> @@ -1915,23 +1929,26 @@ static int rcsi2_disable_streams(struct v4l2_subdev *sd,
>  				 u32 source_pad, u64 source_streams_mask)
>  {
>  	struct rcar_csi2 *priv = sd_to_csi2(sd);
> +	u64 sink_streams;
>  	int ret;
>  
> -	if (source_streams_mask != 1)
> -		return -EINVAL;
> -
>  	if (!priv->remote)
>  		return -ENODEV;
>  
> -	if (priv->stream_count == 1)
> +	sink_streams = v4l2_subdev_state_xlate_streams(state,
> +						       source_pad,
> +						       RCAR_CSI2_SINK,
> +						       &source_streams_mask);
> +
> +	if (priv->enabled_sink_streams_mask == sink_streams)
>  		rcsi2_stop(priv);
>  
>  	ret = v4l2_subdev_disable_streams(priv->remote, priv->remote_pad,
> -					  BIT_ULL(0));
> +					  sink_streams);
>  	if (ret)
>  		return ret;
>  
> -	priv->stream_count -= 1;
> +	priv->enabled_sink_streams_mask &= ~sink_streams;
>  
>  	return 0;
>  }
> @@ -1966,6 +1983,34 @@ static int rcsi2_set_pad_format(struct v4l2_subdev *sd,
>  	return 0;
>  }
>  
> +static int rcsi2_set_routing(struct v4l2_subdev *sd,
> +			     struct v4l2_subdev_state *state,
> +			     enum v4l2_subdev_format_whence which,
> +			     struct v4l2_subdev_krouting *routing)
> +{
> +	struct rcar_csi2 *priv = sd_to_csi2(sd);
> +	int ret;
> +
> +	if (priv->info->use_isp) {
> +		ret = v4l2_subdev_routing_validate(sd, routing,
> +						   V4L2_SUBDEV_ROUTING_ONLY_1_TO_1);
> +	} else {
> +		ret = v4l2_subdev_routing_validate(sd, routing,
> +						   V4L2_SUBDEV_ROUTING_ONLY_1_TO_1 |
> +						   V4L2_SUBDEV_ROUTING_NO_SOURCE_MULTIPLEXING);
> +	}
> +
> +	if (ret)
> +		return ret;
> +
> +	ret = v4l2_subdev_set_routing_with_fmt(sd, state, routing,
> +					       &rcar_csi2_default_fmt);
> +	if (ret)
> +		return ret;
> +
> +	return 0;
> +}
> +
>  static int rcsi2_get_frame_desc_fallback(struct v4l2_subdev *sd,
>  					 unsigned int pad,
>  					 struct v4l2_mbus_frame_desc *fd)
> @@ -2045,6 +2090,7 @@ static const struct v4l2_subdev_pad_ops rcar_csi2_pad_ops = {
>  	.set_fmt = rcsi2_set_pad_format,
>  	.get_fmt = v4l2_subdev_get_fmt,
>  
> +	.set_routing = rcsi2_set_routing,
>  	.get_frame_desc = rcsi2_get_frame_desc,
>  };
>  
> @@ -2065,17 +2111,6 @@ static int rcsi2_init_state(struct v4l2_subdev *sd,
>  		},
>  	};
>  
> -	static const struct v4l2_mbus_framefmt rcar_csi2_default_fmt = {
> -		.width		= 1920,
> -		.height		= 1080,
> -		.code		= MEDIA_BUS_FMT_RGB888_1X24,
> -		.colorspace	= V4L2_COLORSPACE_SRGB,
> -		.field		= V4L2_FIELD_NONE,
> -		.ycbcr_enc	= V4L2_YCBCR_ENC_DEFAULT,
> -		.quantization	= V4L2_QUANTIZATION_DEFAULT,
> -		.xfer_func	= V4L2_XFER_FUNC_DEFAULT,
> -	};
> -
>  	static const struct v4l2_subdev_krouting routing = {
>  		.num_routes = ARRAY_SIZE(routes),
>  		.routes = routes,
> @@ -2120,13 +2155,13 @@ static irqreturn_t rcsi2_irq_thread(int irq, void *data)
>  
>  	state = v4l2_subdev_lock_and_get_active_state(&priv->subdev);
>  
> -	if (priv->stream_count == 0)
> +	if (!priv->enabled_sink_streams_mask)
>  		goto out;
>  
>  	rcsi2_stop(priv);
>  
>  	ret = v4l2_subdev_disable_streams(priv->remote, priv->remote_pad,
> -					  BIT_ULL(0));
> +					  priv->enabled_sink_streams_mask);
>  	if (ret) {
>  		dev_warn(priv->dev,
>  			 "Error recovery: failed to disable streams: %d\n",
> @@ -2145,7 +2180,7 @@ static irqreturn_t rcsi2_irq_thread(int irq, void *data)
>  	}
>  
>  	ret = v4l2_subdev_enable_streams(priv->remote, priv->remote_pad,
> -					 BIT_ULL(0));
> +					 priv->enabled_sink_streams_mask);
>  	if (ret) {
>  		dev_warn(priv->dev,
>  			 "Error recovery: failed to start streams: %d\n",
> @@ -2748,8 +2783,6 @@ static int rcsi2_probe(struct platform_device *pdev)
>  
>  	priv->dev = &pdev->dev;
>  
> -	priv->stream_count = 0;
> -
>  	ret = rcsi2_probe_resources(priv, pdev);
>  	if (ret) {
>  		dev_err(priv->dev, "Failed to get resources\n");
> 
> -- 
> 2.43.0
> 

-- 
Kind Regards,
Niklas Söderlund