linux-kernel - Re: [PATCH 03/10] media: Add Y212 video format

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Message-ID: <605689aa181770ad6c7fca2a55967ab5fc5a3699.camel@ndufresne.ca>
Date:   Wed, 22 Feb 2023 10:31:14 -0500
From:   Nicolas Dufresne <nicolas@...fresne.ca>
To:     Hans Verkuil <hverkuil-cisco@...all.nl>,
        Ming Qian <ming.qian@....com>, mchehab@...nel.org,
        mirela.rabulea@....nxp.com
Cc:     shawnguo@...nel.org, s.hauer@...gutronix.de, kernel@...gutronix.de,
        festevam@...il.com, xiahong.bao@....com, linux-imx@....com,
        linux-media@...r.kernel.org, linux-kernel@...r.kernel.org,
        devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH 03/10] media: Add Y212 video format

Hi Hans, Ming,

Le vendredi 27 janvier 2023 à 15:37 +0100, Hans Verkuil a écrit :
> On 20/12/2022 04:11, Ming Qian wrote:
> > Y212 is a YUV format with 12-bits per component like YUYV,
> > expanded to 16bits.
> > Data in the 12 high bits, zeros in the 4 low bits,
> > arranged in little endian order.
> > 
> > 

[...]

> > @@ -618,6 +618,7 @@ struct v4l2_pix_format {
> >  #define V4L2_PIX_FMT_YUVA32  v4l2_fourcc('Y', 'U', 'V', 'A') /* 32  YUVA-8-8-8-8  */
> >  #define V4L2_PIX_FMT_YUVX32  v4l2_fourcc('Y', 'U', 'V', 'X') /* 32  YUVX-8-8-8-8  */
> >  #define V4L2_PIX_FMT_M420    v4l2_fourcc('M', '4', '2', '0') /* 12  YUV 4:2:0 2 lines y, 1 line uv interleaved */
> > +#define V4L2_PIX_FMT_Y212    v4l2_fourcc('Y', '2', '1', '2') /* 32  YUYV 12-bit per component */
> 
> This definitely needs to be renamed to prevent repeating the 'P010' mistake.
> 
> It's a YUYV format, so perhaps: _YUYV_12?
> 
> You definitely need to have 'YUYV' in the name in order to deal with different
> YUV orders.

Hans, it seems you already accepted this exact same format from 
Tomi Valkeinen <tomi.valkeinen+renesas@...asonboard.com> / [PATCH v3 2/7] media:
Add Y210, Y212 and Y216 formats.

Tomi omitted to update v4l2-common.c file. Ming, do you mind keeping this part
of your patch (adding Y210/Y216 support), this way we'd get that properly
implemented.

Nicolas

p.s. We can alternatively change our mind as this is not final yet I think.

[...]