linux-kernel - Re: [PATCH 8/9] media: sun6i-isp: capture: Implement MC I/O with extended enum

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Date:   Sat, 25 Mar 2023 23:42:12 +0200
From:   Laurent Pinchart <laurent.pinchart@...asonboard.com>
To:     Paul Kocialkowski <paul.kocialkowski@...tlin.com>
Cc:     linux-media@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-sunxi@...ts.linux.dev, linux-kernel@...r.kernel.org,
        linux-staging@...ts.linux.dev,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Chen-Yu Tsai <wens@...e.org>,
        Jernej Skrabec <jernej.skrabec@...il.com>,
        Samuel Holland <samuel@...lland.org>,
        Adam Pigg <adam@...gz.co.uk>,
        Thomas Petazzoni <thomas.petazzoni@...tlin.com>
Subject: Re: [PATCH 8/9] media: sun6i-isp: capture: Implement MC I/O with
 extended enum_fmt

Hi Paul,

Thank you for the patch.

On Fri, Mar 24, 2023 at 04:12:27PM +0100, Paul Kocialkowski wrote:
> This driver needs the media-controller API to operate and should not be
> considered as a video-device-centric implementation.
> 
> Properly report the IO_MC device cap and extend the enum_fmt
> implementation to support enumeration with an explicit mbus_code.
> 
> Signed-off-by: Paul Kocialkowski <paul.kocialkowski@...tlin.com>
> ---
>  .../staging/media/sunxi/sun6i-isp/sun6i_isp_capture.c    | 9 ++++++++-
>  1 file changed, 8 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/staging/media/sunxi/sun6i-isp/sun6i_isp_capture.c b/drivers/staging/media/sunxi/sun6i-isp/sun6i_isp_capture.c
> index 1595a9607775..5160b93b69ff 100644
> --- a/drivers/staging/media/sunxi/sun6i-isp/sun6i_isp_capture.c
> +++ b/drivers/staging/media/sunxi/sun6i-isp/sun6i_isp_capture.c
> @@ -439,6 +439,12 @@ static int sun6i_isp_capture_enum_fmt(struct file *file, void *private,
>  				      struct v4l2_fmtdesc *fmtdesc)
>  {
>  	u32 index = fmtdesc->index;
> +	u32 mbus_code = fmtdesc->mbus_code;
> +
> +	if (mbus_code && !sun6i_isp_proc_format_find(mbus_code))
> +		return -EINVAL;
> +

This doesn't look right. As far as I understand,
sun6i_isp_proc_format_find() looks up media bus codes for the ISP sink
pad. Here you enuemrate pixel formats of the ISP output, so the media
bus code given by userspace corresponds to the ISP source pad.

I've had a look at sun6i_isp_proc_set_fmt() to see what media bus codes
are used on the ISP output, and couldn't figure it out as it seems
incorrectly implemented :-) The function doesn't check format->pad.

> +	/* Capture format is independent from proc format. */
>  
>  	if (index >= ARRAY_SIZE(sun6i_isp_capture_formats))
>  		return -EINVAL;
> @@ -685,7 +691,8 @@ int sun6i_isp_capture_setup(struct sun6i_isp_device *isp_dev)
>  
>  	strscpy(video_dev->name, SUN6I_ISP_CAPTURE_NAME,
>  		sizeof(video_dev->name));
> -	video_dev->device_caps = V4L2_CAP_VIDEO_CAPTURE | V4L2_CAP_STREAMING;
> +	video_dev->device_caps = V4L2_CAP_VIDEO_CAPTURE | V4L2_CAP_STREAMING |
> +				 V4L2_CAP_IO_MC;
>  	video_dev->vfl_dir = VFL_DIR_RX;
>  	video_dev->release = video_device_release_empty;
>  	video_dev->fops = &sun6i_isp_capture_fops;

-- 
Regards,

Laurent Pinchart