linux-kernel - [PATCH 2/3] drm: fourcc byteorder: add DRM_FORMAT_CPU

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Message-Id: <20170502133404.15354-3-kraxel@redhat.com>
Date:   Tue,  2 May 2017 15:34:03 +0200
From:   Gerd Hoffmann <kraxel@...hat.com>
To:     dri-devel@...ts.freedesktop.org
Cc:     Ville Syrjälä 
        <ville.syrjala@...ux.intel.com>,
        Daniel Vetter <daniel.vetter@...el.com>,
        Pekka Paalanen <ppaalanen@...il.com>,
        Ilia Mirkin <imirkin@...m.mit.edu>,
        Michel Dänzer <michel@...nzer.net>,
        Alex Deucher <alexdeucher@...il.com>,
        amd-gfx@...ts.freedesktop.org,
        Jani Nikula <jani.nikula@...ux.intel.com>,
        Sean Paul <seanpaul@...omium.org>,
        David Airlie <airlied@...ux.ie>,
        Gerd Hoffmann <kraxel@...hat.com>,
        linux-kernel@...r.kernel.org (open list)
Subject: [PATCH 2/3] drm: fourcc byteorder: add DRM_FORMAT_CPU_*

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

Signed-off-by: Gerd Hoffmann <kraxel@...hat.com>
---
 include/drm/drm_fourcc.h | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/include/drm/drm_fourcc.h b/include/drm/drm_fourcc.h
index 6942e84b6e..cae05153e8 100644
--- a/include/drm/drm_fourcc.h
+++ b/include/drm/drm_fourcc.h
@@ -25,6 +25,18 @@
 #include <linux/types.h>
 #include <uapi/drm/drm_fourcc.h>
 
+/*
+ * DRM formats are little endian.  define cpu endian variants here, to
+ * reduce the #ifdefs needed in drivers.
+ */
+#ifdef __BIG_ENDIAN
+# define DRM_FORMAT_CPU_XRGB8888 DRM_FORMAT_BGRX8888
+# define DRM_FORMAT_CPU_ARGB8888 DRM_FORMAT_BGRA8888
+#else
+# define DRM_FORMAT_CPU_XRGB8888 DRM_FORMAT_XRGB8888
+# define DRM_FORMAT_CPU_ARGB8888 DRM_FORMAT_ARGB8888
+#endif
+
 struct drm_device;
 struct drm_mode_fb_cmd2;
 
-- 
2.9.3