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Subject[PATCH 1/5] drm: byteorder: add DRM_FORMAT_HOST_*
Date
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>
---
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
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