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drm: byteorder: add DRM_FORMAT_HOST_* 

Add fourcc variants in host byte order.  With these at hand we don't
need #ifdefs in drivers which support framebuffers in cpu endianess.

Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Link: http://patchwork.freedesktop.org/patch/msgid/20180905060445.15008-3-kraxel@redhat.com
This commit is contained in:
Gerd Hoffmann 2018-09-05 08:04:41 +02:00
parent 0e94043ee1
commit ec2fae2558
1 changed files with 22 additions and 0 deletions
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22
include/drm/drm_fourcc.h
View File

@ -25,6 +25,28 @@
#include <linux/types.h>
#include <uapi/drm/drm_fourcc.h>
/*
* DRM formats are little endian. Define host endian variants for the
* most common formats here, to reduce the #ifdefs needed in drivers.
*
* Note that the DRM_FORMAT_BIG_ENDIAN flag should only be used in
* case the format can't be specified otherwise, so we don't end up
* with two values describing the same format.
*/
#ifdef __BIG_ENDIAN
# define DRM_FORMAT_HOST_XRGB1555 (DRM_FORMAT_XRGB1555 | \
DRM_FORMAT_BIG_ENDIAN)
# define DRM_FORMAT_HOST_RGB565 (DRM_FORMAT_RGB565 | \
DRM_FORMAT_BIG_ENDIAN)
# define DRM_FORMAT_HOST_XRGB8888 DRM_FORMAT_BGRX8888
# define DRM_FORMAT_HOST_ARGB8888 DRM_FORMAT_BGRA8888
#else
# define DRM_FORMAT_HOST_XRGB1555 DRM_FORMAT_XRGB1555
# define DRM_FORMAT_HOST_RGB565 DRM_FORMAT_RGB565
# define DRM_FORMAT_HOST_XRGB8888 DRM_FORMAT_XRGB8888
# define DRM_FORMAT_HOST_ARGB8888 DRM_FORMAT_ARGB8888
#endif
struct drm_device;
struct drm_mode_fb_cmd2;