linux-kernel - Re: [PATCH] media: imx-csi: Input connections to CSI should be optional

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Date:   Tue, 15 Jan 2019 08:42:14 -0800
From:   Tim Harvey <tharvey@...eworks.com>
To:     Steve Longerbeam <slongerbeam@...il.com>
Cc:     linux-media <linux-media@...r.kernel.org>,
        Philipp Zabel <p.zabel@...gutronix.de>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        "open list:STAGING SUBSYSTEM" <devel@...verdev.osuosl.org>,
        open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] media: imx-csi: Input connections to CSI should be optional

On Wed, Jan 9, 2019 at 10:34 AM Steve Longerbeam <slongerbeam@...il.com> wrote:
>
> Some imx platforms do not have fwnode connections to all CSI input
> ports, and should not be treated as an error. This includes the
> imx6q SabreAuto, which has no connections to ipu1_csi1 and ipu2_csi0.
> Return -ENOTCONN in imx_csi_parse_endpoint() so that v4l2-fwnode
> endpoint parsing will not treat an unconnected CSI input port as
> an error.
>
> Fixes: c893500a16baf ("media: imx: csi: Register a subdev notifier")
>
> Signed-off-by: Steve Longerbeam <slongerbeam@...il.com>
> ---
>  drivers/staging/media/imx/imx-media-csi.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/staging/media/imx/imx-media-csi.c b/drivers/staging/media/imx/imx-media-csi.c
> index 4223f8d418ae..30b1717982ae 100644
> --- a/drivers/staging/media/imx/imx-media-csi.c
> +++ b/drivers/staging/media/imx/imx-media-csi.c
> @@ -1787,7 +1787,7 @@ static int imx_csi_parse_endpoint(struct device *dev,
>                                   struct v4l2_fwnode_endpoint *vep,
>                                   struct v4l2_async_subdev *asd)
>  {
> -       return fwnode_device_is_available(asd->match.fwnode) ? 0 : -EINVAL;
> +       return fwnode_device_is_available(asd->match.fwnode) ? 0 : -ENOTCONN;
>  }
>
>  static int imx_csi_async_register(struct csi_priv *priv)
> --
> 2.17.1
>

Steve,

Thanks, this fixes adv7180 the capture regression on the Gateworks
Ventana boards as well. This should go to stable to fix 4.20 so please
add a 'Cc: stable@...r.kernel.org' if you re-submit (else we can send
it to stable@...r.kernel.org later).

Acked-by: Tim Harvey <tharvey@...eworks.com>

Tim