Re: [PATCH v5 06/10] media: rcar-vin: Parse parallel input on Gen3

[jacopo mondi <jacopo@jmondi.org>]

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Hi,

On Tue, May 29, 2018 at 10:48:04AM +0200, Jacopo Mondi wrote:
> The rcar-vin driver so far had a mutually exclusive code path for
> handling parallel and CSI-2 video input subdevices, with only the CSI-2
> use case supporting media-controller. As we add support for parallel
> inputs to Gen3 media-controller compliant code path now parse both port@0
> and port@1, handling the media-controller use case in the parallel
> bound/unbind notifier operations.
>
> Signed-off-by: Jacopo Mondi <jacopo+renesas@jmondi.org>
>
> ---
> v4 -> v5:
> - Re-group rvin_mc_init() function
> - Add error_group_unreg error path to clean up group registration
> - Change rvin_parallel_init() return type to make sure Gen2 works as before
>
> v3 -> v4:
> - Change the mc/parallel initialization order. Initialize mc first, then
>   parallel
> - As a consequence no need to delay parallel notifiers registration, the
>   media controller is set up already when parallel input got parsed,
>   this greatly simplify the group notifier complete callback.
>
> ---
>  drivers/media/platform/rcar-vin/rcar-core.c | 53 +++++++++++++++++++++--------
>  1 file changed, 38 insertions(+), 15 deletions(-)
>
> diff --git a/drivers/media/platform/rcar-vin/rcar-core.c b/drivers/media/platform/rcar-vin/rcar-core.c
> index fc98986..c1d6feb 100644
> --- a/drivers/media/platform/rcar-vin/rcar-core.c
> +++ b/drivers/media/platform/rcar-vin/rcar-core.c
> @@ -399,6 +399,11 @@ static int rvin_parallel_subdevice_attach(struct rvin_dev *vin,
>  	ret = rvin_find_pad(subdev, MEDIA_PAD_FL_SINK);
>  	vin->parallel->sink_pad = ret < 0 ? 0 : ret;
>
> +	if (vin->info->use_mc) {
> +		vin->parallel->subdev = subdev;
> +		return 0;
> +	}
> +
>  	/* Find compatible subdevices mbus format */
>  	vin->mbus_code = 0;
>  	code.index = 0;
> @@ -460,10 +465,12 @@ static int rvin_parallel_subdevice_attach(struct rvin_dev *vin,
>  static void rvin_parallel_subdevice_detach(struct rvin_dev *vin)
>  {
>  	rvin_v4l2_unregister(vin);
> -	v4l2_ctrl_handler_free(&vin->ctrl_handler);
> -
> -	vin->vdev.ctrl_handler = NULL;
>  	vin->parallel->subdev = NULL;
> +
> +	if (!vin->info->use_mc) {
> +		v4l2_ctrl_handler_free(&vin->ctrl_handler);
> +		vin->vdev.ctrl_handler = NULL;
> +	}
>  }
>
>  static int rvin_parallel_notify_complete(struct v4l2_async_notifier *notifier)
> @@ -552,18 +559,19 @@ static int rvin_parallel_parse_v4l2(struct device *dev,
>  	return 0;
>  }
>
> -static int rvin_parallel_graph_init(struct rvin_dev *vin)
> +static int rvin_parallel_init(struct rvin_dev *vin)
>  {
>  	int ret;
>
> -	ret = v4l2_async_notifier_parse_fwnode_endpoints(
> -		vin->dev, &vin->notifier,
> -		sizeof(struct rvin_parallel_entity), rvin_parallel_parse_v4l2);
> +	ret = v4l2_async_notifier_parse_fwnode_endpoints_by_port(
> +		vin->dev, &vin->notifier, sizeof(struct rvin_parallel_entity),
> +		0, rvin_parallel_parse_v4l2);
>  	if (ret)
>  		return ret;
>
> +	/* If using mc, it's fine not to have any input registered. */
>  	if (!vin->parallel)
> -		return -ENODEV;
> +		return vin->info->use_mc ? 0 : -ENODEV;
>
>  	vin_dbg(vin, "Found parallel subdevice %pOF\n",
>  		to_of_node(vin->parallel->asd.match.fwnode));
> @@ -1084,20 +1092,35 @@ static int rcar_vin_probe(struct platform_device *pdev)
>  		return ret;
>
>  	platform_set_drvdata(pdev, vin);
> -	if (vin->info->use_mc)
> +
> +	if (vin->info->use_mc) {
>  		ret = rvin_mc_init(vin);
> -	else
> -		ret = rvin_parallel_graph_init(vin);
> -	if (ret < 0)
> -		goto error;
> +		if (ret)
> +			goto error_dma_unregister;
> +	}
> +
> +	ret = rvin_parallel_init(vin);
> +	if (ret)
> +		goto error_group_unregister;
>
>  	pm_suspend_ignore_children(&pdev->dev, true);
>  	pm_runtime_enable(&pdev->dev);
>
>  	return 0;
> -error:
> +
> +error_group_unreg:

I just noticed I forgot to add a change before formatting out patches.
This label name is wrong.

I'll wait for other comments, and will send v6 with this fixed. Sorry
about that.

Thanks
   j

> +	if (vin->info->use_mc) {
> +		mutex_lock(&vin->group->lock);
> +		if (&vin->v4l2_dev == vin->group->notifier.v4l2_dev) {
> +			v4l2_async_notifier_unregister(&vin->group->notifier);
> +			v4l2_async_notifier_cleanup(&vin->group->notifier);
> +		}
> +		mutex_unlock(&vin->group->lock);
> +		rvin_group_put(vin);
> +	}
> +
> +error_dma_unreg:
>  	rvin_dma_unregister(vin);
> -	v4l2_async_notifier_cleanup(&vin->notifier);
>
>  	return ret;
>  }
> --
> 2.7.4
>

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