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

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Date:	Wed, 13 Jul 2016 10:03:08 +0800
From:	tiffany lin <tiffany.lin@...iatek.com>
To:	Wu-Cheng Li (李務誠) 
	<wuchengli@...omium.org>
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 Tue, 2016-07-12 at 16:16 +0800, Wu-Cheng Li (李務誠) wrote:
> 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)?
> >
We are working on this. Will upstream soon.

> > 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.
That's right in MT8173 platform.

best regards,
Tiffany
> > 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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