[PATCH 2/3] uapi: drm: New fourcc codes needed by Xilinx Video IP

[Ville Syrjälä]

On Mon, Nov 27, 2017 at 06:27:32PM -0800, Hyun Kwon wrote:
> From: Jeffrey Mouroux <jmouroux at xilinx.com>
> 
> The Xilinx Video Mixer and Xilinx Video Framebuffer DMA IP
> support video memory formats that are not represented in the
> current DRM fourcc library.  This patch adds those missing
> fourcc codes.
> 
> Signed-off-by: Jeffrey Mouroux <jmouroux at xilinx.com>
> Signed-off-by: Hyun Kwon <hyun.kwon at xilinx.com>
> ---
>  include/uapi/drm/drm_fourcc.h | 9 +++++++++
>  1 file changed, 9 insertions(+)
> 
> diff --git a/include/uapi/drm/drm_fourcc.h b/include/uapi/drm/drm_fourcc.h
> index 3ad838d..83806d5 100644
> --- a/include/uapi/drm/drm_fourcc.h
> +++ b/include/uapi/drm/drm_fourcc.h
> @@ -112,6 +112,13 @@ extern "C" {
>  #define DRM_FORMAT_VYUY		fourcc_code('V', 'Y', 'U', 'Y') /* [31:0] Y1:Cb0:Y0:Cr0 8:8:8:8 little endian */
>  
>  #define DRM_FORMAT_AYUV		fourcc_code('A', 'Y', 'U', 'V') /* [31:0] A:Y:Cb:Cr 8:8:8:8 little endian */
> +#define DRM_FORMAT_VUY888	fourcc_code('V', 'U', '2', '4') /* [23:0] Cr:Cb:Y little endian */
> +#define DRM_FORMAT_XVUY8888	fourcc_code('X', 'V', '2', '4') /* [31:0] x:Cr:Cb:Y 8:8:8:8 little endian */
> +#define DRM_FORMAT_XVUY2101010	fourcc_code('X', 'V', '3', '0') /* [31:0] x:Cr:Cb:Y 2:10:10:10 little endian */
> +
> +/* Grey scale */
> +#define DRM_FORMAT_Y8		fourcc_code('G', 'R', 'E', 'Y') /* 8-bit packed greyscale Y:Y:Y:Y 8:8:8:8 */
> +#define DRM_FORMAT_Y10		fourcc_code('Y', '1', '0', ' ') /* 10-bit packed greyscale X:Y:Y:Y 2:10:10:10 */

These don't make sense to me. What does it even mean to have Y
replicated three or four times for each pixel?

>  
>  /*
>   * 2 plane RGB + A
> @@ -140,6 +147,8 @@ 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_XV15		fourcc_code('X', 'V', '1', '5') /* 2x2 subsampled Cr:Cb plane 2:10:10:10 */
> +#define DRM_FORMAT_XV20		fourcc_code('X', 'V', '2', '0') /* 2x1 subsampled Cr:Cb plane 2:10:10:10 */

Huh. Where are the Cb:Cr in that 2:10:10:10 layout?

Better docs please.

>  
>  /*
>   * 3 plane YCbCr
> -- 
> 2.7.4
> 
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-- 
Ville Syrjälä
Intel OTC