linux-kernel - Re: [Intel-gfx] [PATCH v9 3/7] drm: Extend the drm format

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Date:   Thu, 15 Jun 2017 13:21:35 +0300
From:   Ville Syrjälä <ville.syrjala@...ux.intel.com>
To:     Xiaoguang Chen <xiaoguang.chen@...el.com>
Cc:     alex.williamson@...hat.com, kraxel@...hat.com,
        chris@...is-wilson.co.uk, intel-gfx@...ts.freedesktop.org,
        linux-kernel@...r.kernel.org, zhenyuw@...ux.intel.com,
        zhiyuan.lv@...el.com, intel-gvt-dev@...ts.freedesktop.org,
        zhi.a.wang@...el.com, kevin.tian@...el.com
Subject: Re: [Intel-gfx] [PATCH v9 3/7] drm: Extend the drm format

On Thu, Jun 15, 2017 at 04:00:07PM +0800, Xiaoguang Chen wrote:
> Add new drm format which will be used by GVT-g.
> 
> Signed-off-by: Xiaoguang Chen <xiaoguang.chen@...el.com>
> ---
>  include/uapi/drm/drm_fourcc.h | 4 ++++
>  1 file changed, 4 insertions(+)
> 
> diff --git a/include/uapi/drm/drm_fourcc.h b/include/uapi/drm/drm_fourcc.h
> index 55e3010..2681862 100644
> --- a/include/uapi/drm/drm_fourcc.h
> +++ b/include/uapi/drm/drm_fourcc.h
> @@ -113,6 +113,10 @@ extern "C" {
>  
>  #define DRM_FORMAT_AYUV		fourcc_code('A', 'Y', 'U', 'V') /* [31:0] A:Y:Cb:Cr 8:8:8:8 little endian */
>  
> +/* 64 bpp RGB */
> +#define DRM_FORMAT_XRGB161616  fourcc_code('X', 'R', '4', '8') /* [63:0] x:R:G:B 16:16:16:16 little endian */
> +#define DRM_FORMAT_XBGR161616  fourcc_code('X', 'B', '4', '8') /* [63:0] x:B:G:R 16:16:16:16 little endian */

Are these supposed to be the half float formats? If so the docs are
lacking. Also this sort of stuff must be sent to dri-devel for everyone
to see.

That said, I don't really like having them in any gvt code until
they're handled by the driver proper.

> +
>  /*
>   * 2 plane RGB + A
>   * index 0 = RGB plane, same format as the corresponding non _A8 format has
> -- 
> 2.7.4
> 
> _______________________________________________
> Intel-gfx mailing list
> Intel-gfx@...ts.freedesktop.org
> https://lists.freedesktop.org/mailman/listinfo/intel-gfx

-- 
Ville Syrjälä
Intel OTC

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