[igt-dev] [PATCH i-g-t 1/2] drm-uapi: Add fourcc's for 16 bpc fixed point framebuffer formats.

[Ville Syrjälä]

On Mon, May 03, 2021 at 08:25:54PM +0200, Mario Kleiner wrote:
> These are 16 bits per color channel unsigned normalized formats.
> They are supported by at least AMD display hw, and suitable for
> direct scanout of Vulkan swapchain images in the format
> VK_FORMAT_R16G16B16A16_UNORM.

I think we've been trying to just copy the whole thing from the kernel
and include a reference to the relevant kernel commit. So need to land
the kernel drm_fourcc.h bits first before we land these.

> 
> Signed-off-by: Mario Kleiner <mario.kleiner.de at gmail.com>
> Cc: Ville Syrjälä <ville.syrjala at linux.intel.com>
> Cc: Alex Deucher <alexander.deucher at amd.com>
> ---
>  include/drm-uapi/drm_fourcc.h | 7 +++++++
>  1 file changed, 7 insertions(+)
> 
> diff --git a/include/drm-uapi/drm_fourcc.h b/include/drm-uapi/drm_fourcc.h
> index a7bc058c..5db4f55a 100644
> --- a/include/drm-uapi/drm_fourcc.h
> +++ b/include/drm-uapi/drm_fourcc.h
> @@ -144,6 +144,13 @@ extern "C" {
>  #define DRM_FORMAT_RGBA1010102	fourcc_code('R', 'A', '3', '0') /* [31:0] R:G:B:A 10:10:10:2 little endian */
>  #define DRM_FORMAT_BGRA1010102	fourcc_code('B', 'A', '3', '0') /* [31:0] B:G:R:A 10:10:10:2 little endian */
>  
> +/* 64 bpp RGB */
> +#define DRM_FORMAT_XRGB16161616	fourcc_code('X', 'R', '4', '8') /* [63:0] x:R:G:B 16:16:16:16 little endian */
> +#define DRM_FORMAT_XBGR16161616	fourcc_code('X', 'B', '4', '8') /* [63:0] x:B:G:R 16:16:16:16 little endian */
> +
> +#define DRM_FORMAT_ARGB16161616	fourcc_code('A', 'R', '4', '8') /* [63:0] A:R:G:B 16:16:16:16 little endian */
> +#define DRM_FORMAT_ABGR16161616	fourcc_code('A', 'B', '4', '8') /* [63:0] A:B:G:R 16:16:16:16 little endian */
> +
>  /*
>   * Floating point 64bpp RGB
>   * IEEE 754-2008 binary16 half-precision float
> -- 
> 2.25.1

-- 
Ville Syrjälä
Intel