utils: gen-formats: Support big-endian DRM formats

DRM 4CCs are defined in little-endian, and can be declined in a
big-endian version by setting bit 31 (DRM_FORMAT_BIG_ENDIAN) in the 4CC
value.

Add support for such formats in the gen-formats.py script.

Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Jacopo Mondi <jacopo@jmondi.org>
Reviewed-by: Niklas Söderlund <niklas.soderlund@ragnatech.se>

utils/gen-formats.py

@@ -59,10 +59,13 @@ def generate_h(formats, drm_fourcc):
 
     for format in formats:
         name, format = format.popitem()
+        fourcc = drm_fourcc.fourcc(format['fourcc'])
+        if format.get('big-endian'):
+            fourcc += '| DRM_FORMAT_BIG_ENDIAN'
 
         data = {
             'name': name,
-            'fourcc': drm_fourcc.fourcc(format['fourcc']),
+            'fourcc': fourcc,
             'mod': '0, 0',
         }