Re: [PATCH 1/7] [media]: v4l: add Mediatek MT21 video block format

From: tiffany lin <tiffany.lin@mediatek.com>
To: <nicolas@ndufresne.ca>
Cc: Hans Verkuil <hans.verkuil@cisco.com>,
	<daniel.thompson@linaro.org>, "Rob Herring" <robh+dt@kernel.org>,
	Mauro Carvalho Chehab <mchehab@osg.samsung.com>,
	Matthias Brugger <matthias.bgg@gmail.com>,
	Daniel Kurtz <djkurtz@chromium.org>,
	Pawel Osciak <posciak@chromium.org>,
	Eddie Huang <eddie.huang@mediatek.com>,
	Yingjoe Chen <yingjoe.chen@mediatek.com>,
	<devicetree@vger.kernel.org>, <linux-kernel@vger.kernel.org>,
	<linux-arm-kernel@lists.infradead.org>,
	<linux-media@vger.kernel.org>,
	<linux-mediatek@lists.infradead.org>, <PoChun.Lin@mediatek.com>
Subject: Re: [PATCH 1/7] [media]: v4l: add Mediatek MT21 video block format
Date: Thu, 14 Apr 2016 14:13:41 +0800	[thread overview]
Message-ID: <1460614421.30214.2.camel@mtksdaap41> (raw)
In-Reply-To: <1460557416.18956.3.camel@gmail.com>

Hi 
On Wed, 2016-04-13 at 10:23 -0400, Nicolas Dufresne wrote:
> Le mercredi 13 avril 2016 à 20:01 +0800, Tiffany Lin a écrit :
> > From: Daniel Kurtz <djkurtz@chromium.org>
> > 
> > Mediatek video format is YVU8_420_2PLANE_PACK8_PROGRESSIVE.
> > 
> > Create V4L2_PIX_FMT_MT21 and DRM_FORMAT_MT21 to be consistent with
> > V4L2_PIX_FMT_NV12 notation.
> > 
> > Signed-off-by: Tiffany Lin <tiffany.lin@mediatek.com>
> > ---
> >  include/uapi/drm/drm_fourcc.h  |    1 +
> >  include/uapi/linux/videodev2.h |    2 ++
> 
> Might be better to split this patch.
Got it, will split to two patch in next version.

> 
> >  2 files changed, 3 insertions(+)
> > 
> > diff --git a/include/uapi/drm/drm_fourcc.h b/include/uapi/drm/drm_fourcc.h
> > index 0b69a77..a193905 100644
> > --- a/include/uapi/drm/drm_fourcc.h
> > +++ b/include/uapi/drm/drm_fourcc.h
> > @@ -116,6 +116,7 @@
> >  #define DRM_FORMAT_NV24		fourcc_code('N', 'V', '2', '4') /* non-subsampled Cr:Cb plane */
> >  #define DRM_FORMAT_NV42		fourcc_code('N', 'V', '4', '2') /* non-subsampled Cb:Cr plane */
> >  
> > +#define DRM_FORMAT_MT21		fourcc_code('M', 'T', '2', '1') /* Mediatek Block Mode */
> 
> Please document the tiling format, don't just add a define here.
Got it, will add documentation in next version.

> 
> >  /*
> >   * 3 plane YCbCr
> >   * index 0: Y plane, [7:0] Y
> > diff --git a/include/uapi/linux/videodev2.h b/include/uapi/linux/videodev2.h
> > index d0acd26..e9e3276 100644
> > --- a/include/uapi/linux/videodev2.h
> > +++ b/include/uapi/linux/videodev2.h
> > @@ -527,6 +527,8 @@ struct v4l2_pix_format {
> >  #define V4L2_PIX_FMT_HM12    v4l2_fourcc('H', 'M', '1', '2') /*  8  YUV 4:2:0 16x16 macroblocks */
> >  #define V4L2_PIX_FMT_M420    v4l2_fourcc('M', '4', '2', '0') /* 12  YUV 4:2:0 2 lines y, 1 line uv interleaved */
> >  
> > +#define V4L2_PIX_FMT_MT21    v4l2_fourcc('M', 'T', '2', '1') /* Mediatek Block Mode  */
> > +
> 
> Same. On Linux Media side, there is docbook documentation where you can
> explain in detail.
Got it, will add documentation in next version.

> 
> >  /* two planes -- one Y, one Cr + Cb interleaved  */
> >  #define V4L2_PIX_FMT_NV12    v4l2_fourcc('N', 'V', '1', '2') /* 12  Y/CbCr 4:2:0  */
> >  #define V4L2_PIX_FMT_NV21    v4l2_fourcc('N', 'V', '2', '1') /* 12  Y/CrCb 4:2:0  */