linux-kernel - Re: [PATCH v5 09/14] media: cadence: csi2rx: Add link validation

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Message-ID: <Yc05yD/P/UQlSG8B@pendragon.ideasonboard.com>
Date:   Thu, 30 Dec 2021 06:47:04 +0200
From:   Laurent Pinchart <laurent.pinchart@...asonboard.com>
To:     Pratyush Yadav <p.yadav@...com>
Cc:     Mauro Carvalho Chehab <mchehab@...nel.org>,
        Nikhil Devshatwar <nikhil.nd@...com>,
        Tomi Valkeinen <tomi.valkeinen@...asonboard.com>,
        Vignesh Raghavendra <vigneshr@...com>,
        Benoit Parrot <bparrot@...com>,
        Maxime Ripard <mripard@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Sakari Ailus <sakari.ailus@...ux.intel.com>,
        Niklas Söderlund 
        <niklas.soderlund+renesas@...natech.se>,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-media@...r.kernel.org
Subject: Re: [PATCH v5 09/14] media: cadence: csi2rx: Add link validation

Hi Pratyush,

Thank you for the patch.

On Fri, Dec 24, 2021 at 12:46:10AM +0530, Pratyush Yadav wrote:
> Add media link validation to make sure incorrectly configured pipelines
> are caught. Since there is no support for transcoding, rely on the
> default link validation function to make sure formats across source and
> sink pads are the same.

I think the commit message is a bit misleading. The default link
validation function ensures that formats on the source and sink sides of
a link match. It doesn't compare the formats on the sink and source pads
of the subdev. Whether the subdev can transcode or not is thus not
relevant here.

> Signed-off-by: Pratyush Yadav <p.yadav@...com>
> 
> ---
> 
> Changes in v5:
> - New in v5.
> 
>  drivers/media/platform/cadence/cdns-csi2rx.c | 5 +++++
>  1 file changed, 5 insertions(+)
> 
> diff --git a/drivers/media/platform/cadence/cdns-csi2rx.c b/drivers/media/platform/cadence/cdns-csi2rx.c
> index 53659776a906..119c7540c75a 100644
> --- a/drivers/media/platform/cadence/cdns-csi2rx.c
> +++ b/drivers/media/platform/cadence/cdns-csi2rx.c
> @@ -492,6 +492,10 @@ static const struct v4l2_subdev_ops csi2rx_subdev_ops = {
>  	.pad		= &csi2rx_pad_ops,
>  };
>  
> +static struct media_entity_operations csi2rx_media_ops = {

static const

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

> +	.link_validate = v4l2_subdev_link_validate,
> +};
> +
>  static int csi2rx_async_bound(struct v4l2_async_notifier *notifier,
>  			      struct v4l2_subdev *s_subdev,
>  			      struct v4l2_async_subdev *asd)
> @@ -691,6 +695,7 @@ static int csi2rx_probe(struct platform_device *pdev)
>  	for (i = CSI2RX_PAD_SOURCE_STREAM0; i < CSI2RX_PAD_MAX; i++)
>  		csi2rx->pads[i].flags = MEDIA_PAD_FL_SOURCE;
>  	csi2rx->subdev.flags |= V4L2_SUBDEV_FL_HAS_DEVNODE;
> +	csi2rx->subdev.entity.ops = &csi2rx_media_ops;
>  
>  	ret = media_entity_pads_init(&csi2rx->subdev.entity, CSI2RX_PAD_MAX,
>  				     csi2rx->pads);

-- 
Regards,

Laurent Pinchart