linux-kernel - Re: [PATCH] media: Fix P010 tiled format description

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Date:   Sat, 15 Oct 2022 10:59:28 +0200
From:   Hans Verkuil <hverkuil-cisco@...all.nl>
To:     Jernej Skrabec <jernej.skrabec@...il.com>, mchehab@...nel.org
Cc:     ezequiel@...guardiasur.com.ar, benjamin.gaignard@...labora.com,
        linux-media@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] media: Fix P010 tiled format description

Hi Jernej,

On 10/15/22 10:56, Jernej Skrabec wrote:
> There is only 31 bytes of space (without null character) for format
> description. P010 tiled format description overflows that for 1
> character and warning is generated when used. Fix that by changing Cb to
> U and Cr to V, which is also consistent with some other descriptions.
> 
> Fixes: 3c8e19d3d3f9 ("media: Add P010 tiled format")
> Signed-off-by: Jernej Skrabec <jernej.skrabec@...il.com>
> ---
>  drivers/media/v4l2-core/v4l2-ioctl.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/media/v4l2-core/v4l2-ioctl.c b/drivers/media/v4l2-core/v4l2-ioctl.c
> index e6fd355a2e92..5e5616d5915a 100644
> --- a/drivers/media/v4l2-core/v4l2-ioctl.c
> +++ b/drivers/media/v4l2-core/v4l2-ioctl.c
> @@ -1357,7 +1357,7 @@ static void v4l_fill_fmtdesc(struct v4l2_fmtdesc *fmt)
>  	case V4L2_PIX_FMT_NV12_4L4:	descr = "Y/CbCr 4:2:0 (4x4 Linear)"; break;
>  	case V4L2_PIX_FMT_NV12_16L16:	descr = "Y/CbCr 4:2:0 (16x16 Linear)"; break;
>  	case V4L2_PIX_FMT_NV12_32L32:   descr = "Y/CbCr 4:2:0 (32x32 Linear)"; break;
> -	case V4L2_PIX_FMT_P010_4L4:	descr = "10-bit Y/CbCr 4:2:0 (4x4 Linear)"; break;
> +	case V4L2_PIX_FMT_P010_4L4:	descr = "10-bit Y/UV 4:2:0 (4x4 Linear)"; break;
>  	case V4L2_PIX_FMT_NV12M:	descr = "Y/CbCr 4:2:0 (N-C)"; break;
>  	case V4L2_PIX_FMT_NV21M:	descr = "Y/CrCb 4:2:0 (N-C)"; break;
>  	case V4L2_PIX_FMT_NV16M:	descr = "Y/CbCr 4:2:2 (N-C)"; break;

Sorry, I wasn't clear on irc: you should replace Cb and Cr with UV for ALL these
descriptions.

That way all the pixelformat descriptions use the same terminology and it fixes your
issue as well.

Regards,

	Hans