linux-kernel - Re: [PATCH 1/2] drm_fourcc: Add new P010 video format

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Date:   Tue, 3 Jan 2017 10:57:19 +0000
From:   Daniel Stone <daniel@...ishbar.org>
To:     Randy Li <ayaka@...lik.info>
Cc:     dri-devel <dri-devel@...ts.freedesktop.org>,
        "Vetter, Daniel" <daniel.vetter@...el.com>,
        Jani Nikula <jani.nikula@...ux.intel.com>,
        Sean Paul <seanpaul@...omium.org>,
        David Airlie <airlied@...ux.ie>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        randy.li@...k-chips.com, mchehab@...nel.org,
        linux-media@...r.kernel.org
Subject: Re: [PATCH 1/2] drm_fourcc: Add new P010 video format

Hi Randy,

On 2 January 2017 at 09:50, Randy Li <ayaka@...lik.info> wrote:
> 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.
>
> Signed-off-by: Randy Li <ayaka@...lik.info>
> ---
>  include/uapi/drm/drm_fourcc.h | 1 +
>  1 file changed, 1 insertion(+)
>
> diff --git a/include/uapi/drm/drm_fourcc.h b/include/uapi/drm/drm_fourcc.h
> index 9e1bb7f..d2721da 100644
> --- a/include/uapi/drm/drm_fourcc.h
> +++ b/include/uapi/drm/drm_fourcc.h
> @@ -119,6 +119,7 @@ extern "C" {
>  #define DRM_FORMAT_NV61                fourcc_code('N', 'V', '6', '1') /* 2x1 subsampled Cb:Cr plane */
>  #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_P010                fourcc_code('P', '0', '1', '0') /* 2x2 subsampled Cr:Cb plane 10 bits per channel */

Thanks, this looks good, but I have two requests. Firstly, the
Microsoft page here also mentions that P016 is a preferred format
along P010, so please add P016 as well:
https://msdn.microsoft.com/en-us/library/windows/desktop/bb970578(v=vs.85).aspx

I don't see much use of the other (P21x/P41x/Yxxx) formats defined
there, so there's probably no use going wild and adding them just yet.

Secondly, please update the format_info table in drm_fourcc.c for
these two formats, to avoid throwing a WARN_ON every time they are
used.

Cheers,
Daniel