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

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Date:	Wed, 13 Apr 2016 10:23:36 -0400
From:	Nicolas Dufresne <nicolas.dufresne@...il.com>
To:	Tiffany Lin <tiffany.lin@...iatek.com>,
	Hans Verkuil <hans.verkuil@...co.com>,
	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>
Cc:	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, PoChun.Lin@...iatek.com
Subject: Re: [PATCH 1/7] [media]: v4l: add Mediatek MT21 video block format

Le mercredi 13 avril 2016 à 20:01 +0800, Tiffany Lin a écrit :
> From: Daniel Kurtz <djkurtz@...omium.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@...iatek.com>
> ---
>  include/uapi/drm/drm_fourcc.h  |    1 +
>  include/uapi/linux/videodev2.h |    2 ++

Might be better to split this patch.

>  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.

>  /*
>   * 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.

>  /* 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  */