linux-kernel - Re: [PATCH v2 06/10] media: v4l: Add definition for Allwinner's MB32-tiled NV12 format

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Date:   Fri, 04 May 2018 09:58:41 +0200
From:   Paul Kocialkowski <paul.kocialkowski@...tlin.com>
To:     Hans Verkuil <hverkuil@...all.nl>, linux-media@...r.kernel.org,
        devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org, linux-sunxi@...glegroups.com
Cc:     Mauro Carvalho Chehab <mchehab@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Maxime Ripard <maxime.ripard@...tlin.com>,
        Chen-Yu Tsai <wens@...e.org>, Pawel Osciak <pawel@...iak.com>,
        Marek Szyprowski <m.szyprowski@...sung.com>,
        Kyungmin Park <kyungmin.park@...sung.com>,
        Hans Verkuil <hans.verkuil@...co.com>,
        Sakari Ailus <sakari.ailus@...ux.intel.com>,
        Philipp Zabel <p.zabel@...gutronix.de>,
        Arnd Bergmann <arnd@...db.de>,
        Alexandre Courbot <acourbot@...omium.org>,
        Tomasz Figa <tfiga@...omium.org>
Subject: Re: [PATCH v2 06/10] media: v4l: Add definition for Allwinner's
 MB32-tiled NV12 format

Hi,

On Fri, 2018-04-20 at 15:59 +0200, Hans Verkuil wrote:
> On 04/19/18 17:45, Paul Kocialkowski wrote:
> > This introduces support for Allwinner's MB32-tiled NV12 format,
> > where
> > each plane is divided into macroblocks of 32x32 pixels. Hence, the
> > size
> > of each plane has to be aligned to 32 bytes. The pixels inside each
> > macroblock are coded as they would be if the macroblock was a single
> > plane, line after line.
> > 
> > The MB32-tiled NV12 format is used by the video engine on Allwinner
> > platforms: it is the default format for decoded frames (and the only
> > one
> > available in the oldest supported platforms).
> > 
> > Signed-off-by: Paul Kocialkowski <paul.kocialkowski@...tlin.com>
> > ---
> >  include/uapi/linux/videodev2.h | 1 +
> >  1 file changed, 1 insertion(+)
> > 
> > diff --git a/include/uapi/linux/videodev2.h
> > b/include/uapi/linux/videodev2.h
> > index 4b8336f7bcf0..43993a116e2b 100644
> > --- a/include/uapi/linux/videodev2.h
> > +++ b/include/uapi/linux/videodev2.h
> > @@ -669,6 +669,7 @@ struct v4l2_pix_format {
> >  #define V4L2_PIX_FMT_Z16      v4l2_fourcc('Z', '1', '6', ' ') /*
> > Depth data 16-bit */
> >  #define V4L2_PIX_FMT_MT21C    v4l2_fourcc('M', 'T', '2', '1') /*
> > Mediatek compressed block mode  */
> >  #define V4L2_PIX_FMT_INZI     v4l2_fourcc('I', 'N', 'Z', 'I') /*
> > Intel Planar Greyscale 10-bit and Depth 16-bit */
> > +#define V4L2_PIX_FMT_MB32_NV12 v4l2_fourcc('M', 'N', '1', '2') /*
> > Allwinner NV12 in 32x32 macroblocks */
> >  
> >  /* 10bit raw bayer packed, 32 bytes for every 25 pixels, last LSB 6
> > bits unused */
> >  #define V4L2_PIX_FMT_IPU3_SBGGR10	v4l2_fourcc('i', 'p', '3',
> > 'b') /* IPU3 packed 10-bit BGGR bayer */
> > 
> 
> Add an entry for this to v4l_fill_fmtdesc() in v4l2-ioctl.c.
> 
> It also needs to be documented in the spec.

Noted, I will look in that direction for the future versions.

Cheers,

-- 
Paul Kocialkowski, Bootlin (formerly Free Electrons)
Embedded Linux and kernel engineering
https://bootlin.com
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