linux-kernel - Re: [PATCH v3 3/9] DocBook/v4l: Add compressed video formats used on MT8173 codec driver

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Date:	Fri, 8 Jul 2016 12:23:11 +0200
From:	Hans Verkuil <hverkuil@...all.nl>
To:	Tiffany Lin <tiffany.lin@...iatek.com>,
	Hans Verkuil <hans.verkuil@...co.com>,
	daniel.thompson@...aro.org, Rob Herring <robh+dt@...nel.org>,
	Mauro Carvalho Chehab <mchehab@....samsung.com>,
	Matthias Brugger <matthias.bgg@...il.com>,
	Daniel Kurtz <djkurtz@...omium.org>,
	Pawel Osciak <posciak@...omium.org>
Cc:	Eddie Huang <eddie.huang@...iatek.com>,
	Yingjoe Chen <yingjoe.chen@...iatek.com>,
	devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org, linux-media@...r.kernel.org,
	linux-mediatek@...ts.infradead.org, PoChun.Lin@...iatek.com
Subject: Re: [PATCH v3 3/9] DocBook/v4l: Add compressed video formats used on
 MT8173 codec driver

On 05/30/2016 02:29 PM, Tiffany Lin wrote:
> Add V4L2_PIX_FMT_MT21 documentation
> 
> Signed-off-by: Tiffany Lin <tiffany.lin@...iatek.com>
> ---
>  Documentation/DocBook/media/v4l/pixfmt.xml |    6 ++++++
>  1 file changed, 6 insertions(+)
> 
> diff --git a/Documentation/DocBook/media/v4l/pixfmt.xml b/Documentation/DocBook/media/v4l/pixfmt.xml
> index 5a08aee..d40e0ce 100644
> --- a/Documentation/DocBook/media/v4l/pixfmt.xml
> +++ b/Documentation/DocBook/media/v4l/pixfmt.xml
> @@ -1980,6 +1980,12 @@ array. Anything what's in between the UYVY lines is JPEG data and should be
>  concatenated to form the JPEG stream. </para>
>  </entry>
>  	  </row>
> +	  <row id="V4L2_PIX_FMT_MT21">
> +	    <entry><constant>V4L2_PIX_FMT_MT21</constant></entry>
> +	    <entry>'MT21'</entry>
> +	    <entry>Compressed two-planar YVU420 format used by Mediatek MT8173
> +	    codec driver.</entry>

Can you give a few more details? The encoder driver doesn't seem to produce this
format, so who is creating this? Where is this format documented?

Regards,

	Hans

> +	  </row>
>  	</tbody>
>        </tgroup>
>      </table>
>