[v4,1/2] media: add new mediabus format enums for dm365

Hi Manjunath,

On Tuesday 17 July 2012 12:22:42 Hadli, Manjunath wrote:
> On Tue, Jul 17, 2012 at 17:25:42, Laurent Pinchart wrote:
> > On Tuesday 17 July 2012 11:41:11 Hadli, Manjunath wrote:
> > > On Tue, Jul 17, 2012 at 16:26:24, Laurent Pinchart wrote:
> > > > On Friday 30 March 2012 10:09:13 Hadli, Manjunath wrote:
> > > > > add new enum entries for supporting the media-bus formats on dm365.
> > > > > These include some bayer and some non-bayer formats.
> > > > > V4L2_MBUS_FMT_YDYC8_1X16 and V4L2_MBUS_FMT_UV8_1X8 are used
> > > > > internal to the hardware by the resizer.
> > > > > V4L2_MBUS_FMT_SBGGR10_ALAW8_1X8 represents the bayer ALAW format
> > > > > that is supported by dm365 hardware.
> > > > > 
> > > > > Signed-off-by: Manjunath Hadli <manjunath.hadli@ti.com>
> > > > > Cc: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
> > > > > Cc: Sakari Ailus <sakari.ailus@iki.fi>
> > > > > Cc: Hans Verkuil <hans.verkuil@cisco.com>
> > > > > ---
> > > > > 
> > > > >  Documentation/DocBook/media/v4l/subdev-formats.xml |  171 
> > > > >  ++++++++++++
> > > > >  include/linux/v4l2-mediabus.h                      |   10 +-
> > > > >  2 files changed, 179 insertions(+), 2 deletions(-)
> > > > > 
> > > > > diff --git a/Documentation/DocBook/media/v4l/subdev-formats.xml
> > > > > b/Documentation/DocBook/media/v4l/subdev-formats.xml index
> > > > > 49c532e..48d92bb
> > > > > 100644
> > > > > --- a/Documentation/DocBook/media/v4l/subdev-formats.xml
> > > > > +++ b/Documentation/DocBook/media/v4l/subdev-formats.xml
> > 
> > [snip]
> > 
> > > > > @@ -965,6 +1036,56 @@
> > > > > 
> > > > >  	      <entry>y<subscript>1</subscript></entry>
> > > > >  	      <entry>y<subscript>0</subscript></entry>
> > > > >  	    
> > > > >  	    </row>
> > > > > 
> > > > > +	    <row id="V4L2-MBUS-FMT-UV8-1X8">
> > > > 
> > > > That's a weird one. Just out of curiosity, what's the point of
> > > > transferring chroma information without luma ?
> > > 
> > > DM365 supports this format.
> > 
> > Right, but what is it used for ?
> 
> Sorry about that. The Resizer in Dm365 can take only chroma and resize the
> buffer. It can also take luma of course. In general it can take UV8, Y8 and
> also UYVY.

So UV8 is used to resize an NV buffer in two passes (first Y8 then UV8) ?

> > [snip]
> > 
> > > > > @@ -2415,6 +2536,56 @@
> > > > > 
> > > > >  	      <entry>u<subscript>1</subscript></entry>
> > > > >  	      <entry>u<subscript>0</subscript></entry>
> > > > >  	    
> > > > >  	    </row>
> > > > > 
> > > > > +	    <row id="V4L2-MBUS-FMT-YDYC8-1X16">
> > > > 
> > > > What is this beast ? We at least need a textual description, as I have
> > > > no
> > > > idea what the format corresponds to.
> > > 
> > > This was discussed earlier over here
> > > http://patchwork.linuxtv.org/patch/8843/
> > 
> > My bad, I should have remembered that. Please add a textual description of
> > the format, it's not clear from the name what D and C are.
> 
> I see no description for individual MBUS formats but a collective para on
> everything together. Would you like me to add in the same or otherwise can
> you point to me where I can add this description?

What about the following patch ? Note that I've renamed YDYC to YDYU, as we
might later need a YDYV format.

(Hans, Sakari, any opinion ?)

[v4,1/2] media: add new mediabus format enums for dm365

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