Re: [PATCH v4 1/2] drm_fourcc: Add new P010, P016 video format

From: "Ville Syrjälä" <ville.syrjala@linux.intel.com>
To: clinton.a.taylor@intel.com
Cc: Randy Li <ayaka@soulik.info>, dri-devel@lists.freedesktop.org
Subject: Re: [PATCH v4 1/2] drm_fourcc: Add new P010, P016 video format
Date: Mon, 27 Feb 2017 19:41:53 +0200	[thread overview]
Message-ID: <20170227174153.GG31595@intel.com> (raw)
In-Reply-To: <1488216069-11544-1-git-send-email-clinton.a.taylor@intel.com>

On Mon, Feb 27, 2017 at 09:21:09AM -0800, clinton.a.taylor@intel.com wrote:
> From: Clint Taylor <clinton.a.taylor@intel.com>
> 
> P010 is a planar 4:2:0 YUV with interleaved UV plane, 10 bits per
> channel video format. Rockchip's vop support this video format(little
> endian only) as the input video format.
> 
> P016 is a planar 4:2:0 YUV 12 bits per channel
> 
> P016 is a planar 4:2:0 YUV with interleaved UV plane, 16 bits per
> channel video format.
> 
> V3: Added P012 and fixed cpp for P010
> V4: format definition refined per review
> 
> Cc: Daniel Stone <daniel@fooishbar.org>
> Cc: Ville Syrjälä <ville.syrjala@linux.intel.com>
> 
> Signed-off-by: Randy Li <ayaka@soulik.info>
> Signed-off-by: Clint Taylor <clinton.a.taylor@intel.com>
> ---
>  drivers/gpu/drm/drm_fourcc.c  |    4 ++++
>  include/uapi/drm/drm_fourcc.h |   18 ++++++++++++++++++
>  2 files changed, 22 insertions(+)
> 
> diff --git a/drivers/gpu/drm/drm_fourcc.c b/drivers/gpu/drm/drm_fourcc.c
> index 90d2cc8..5494764 100644
> --- a/drivers/gpu/drm/drm_fourcc.c
> +++ b/drivers/gpu/drm/drm_fourcc.c
> @@ -165,6 +165,10 @@ const struct drm_format_info *__drm_format_info(u32 format)
>  		{ .format = DRM_FORMAT_UYVY,		.depth = 0,  .num_planes = 1, .cpp = { 2, 0, 0 }, .hsub = 2, .vsub = 1 },
>  		{ .format = DRM_FORMAT_VYUY,		.depth = 0,  .num_planes = 1, .cpp = { 2, 0, 0 }, .hsub = 2, .vsub = 1 },
>  		{ .format = DRM_FORMAT_AYUV,		.depth = 0,  .num_planes = 1, .cpp = { 4, 0, 0 }, .hsub = 1, .vsub = 1 },
> +		/* FIXME a pixel in Y for P010 is 10 bits */
> +		{ .format = DRM_FORMAT_P010,		.depth = 0,  .num_planes = 2, .cpp = { 2, 4, 0 }, .hsub = 2, .vsub = 2 },
> +		{ .format = DRM_FORMAT_P012,		.depth = 0,  .num_planes = 2, .cpp = { 2, 4, 0 }, .hsub = 2, .vsub = 2 },
> +		{ .format = DRM_FORMAT_P016,		.depth = 0,  .num_planes = 2, .cpp = { 2, 4, 0 }, .hsub = 2, .vsub = 2 },
>  	};

What's this hunk doing here?

>  
>  	unsigned int i;
> diff --git a/include/uapi/drm/drm_fourcc.h b/include/uapi/drm/drm_fourcc.h
> index ef20abb..ad94464 100644
> --- a/include/uapi/drm/drm_fourcc.h
> +++ b/include/uapi/drm/drm_fourcc.h
> @@ -128,6 +128,24 @@
>  #define DRM_FORMAT_NV42		fourcc_code('N', 'V', '4', '2') /* non-subsampled Cb:Cr plane */
>  
>  /*
> + * 2 plane YCbCr MSB aligned P0?? formats
> + * index 0 = Y plane, word array [15:6] P010
> + * or
> + * index 0 = Y plane, word array [15:4] P012
> + * or 
> + * index 0 = Y plane, word array [15:0] P016
> + *
> + * index 1 = Cb:Cr plane, [31:22] Cb [15:6] Cr little endian P010
> + * or
> + * index 1 = Cb:Cr plane, [31:20] Cb [15:4] Cr little endian P012
> + * or
> + * index 1 = Cb:Cr plane, [31:16] Cb [15:0] Cr little endian P016
> + */

Still looks somewhat out of place when compared with the rest of the file.

> +#define DRM_FORMAT_P010		fourcc_code('P', '0', '1', '0') /* 2x2 subsampled Cb:Cr plane 10 bits per channel */
> +#define DRM_FORMAT_P012		fourcc_code('P', '0', '1', '2') /* 2x2 subsampled Cb:Cr plane 12 bits per channel */
> +#define DRM_FORMAT_P016		fourcc_code('P', '0', '1', '6') /* 2x2 subsampled Cb:Cr plane 16 bits per channel */
> +
> +/*
>   * 3 plane YCbCr
>   * index 0: Y plane, [7:0] Y
>   * index 1: Cb plane, [7:0] Cb
> -- 
> 1.7.9.5

-- 
Ville Syrjälä
Intel OTC
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