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authorGerd Hoffmann <kraxel@redhat.com>2018-09-05 08:04:41 +0200
committerGerd Hoffmann <kraxel@redhat.com>2018-09-06 08:40:18 +0200
commitec2fae2558ba6b7b166db20901545cab7e41a050 (patch)
tree12e4ba4bfbfdf5a9082d29a289b6c3a11c399c73 /include/drm
parent0e94043ee1d98d5112aa4e1d68733b0197dfdafa (diff)
downloadlinux-ec2fae2558ba6b7b166db20901545cab7e41a050.tar.bz2
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
Diffstat (limited to 'include/drm')
-rw-r--r--include/drm/drm_fourcc.h22
1 files changed, 22 insertions, 0 deletions
diff --git a/include/drm/drm_fourcc.h b/include/drm/drm_fourcc.h
index f9c15845f465..fac831c40106 100644
--- a/include/drm/drm_fourcc.h
+++ b/include/drm/drm_fourcc.h
@@ -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;