[PATCH v2 2/6] drm: byteorder: add DRM_FORMAT_HOST_*

[Gerd Hoffmann]

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 at redhat.com>
---
 include/drm/drm_fourcc.h | 22 ++++++++++++++++++++++
 1 file changed, 22 insertions(+)

diff --git a/include/drm/drm_fourcc.h b/include/drm/drm_fourcc.h
index f9c15845f4..fac831c401 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;
 
-- 
2.9.3