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

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Message-ID: <CAOMLVLiZU3D587dSyp2b2v4DV+MS9vh85bA4BoG7ddK6556rbA@mail.gmail.com>
Date:	Tue, 12 Jul 2016 16:16:14 +0800
From:	Wu-Cheng Li (李務誠) 
	<wuchengli@...omium.org>
To:	tiffany lin <tiffany.lin@...iatek.com>
Cc:	Hans Verkuil <hverkuil@...all.nl>,
	Hans Verkuil <hans.verkuil@...co.com>,
	Daniel Thompson <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>,
	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,
	Lin PoChun <PoChun.Lin@...iatek.com>
Subject: Re: [PATCH v3 3/9] DocBook/v4l: Add compressed video formats used on
 MT8173 codec driver

On Mon, Jul 11, 2016 at 10:56 AM, tiffany lin <tiffany.lin@...iatek.com> wrote:
> Hi Hans,
>
> On Fri, 2016-07-08 at 12:23 +0200, Hans Verkuil wrote:
>> 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?
Decoder hardware produces MT21 (compressed). Image processor can
convert it to a format that can be input of display driver. Tiffany.
When do you plan to upstream image processor (mtk-mdp)?
>
> It can be as input format for encoder, MDP and display drivers in our
> platform.
I remember display driver can only accept uncompressed MT21. Right?
Basically V4L2_PIX_FMT_MT21 is compressed and is like an opaque
format. It's not usable until it's decompressed and converted by image
processor.
> This private format is only available in our platform.
> So I put it in "Reserved Format Identifiers" sections.
>
>
> best regards,
> Tiffany
>
>> Regards,
>>
>>       Hans
>>
>> > +     </row>
>> >     </tbody>
>> >        </tgroup>
>> >      </table>
>> >
>
>
> --
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