drm: Add drm_mode_create_rotation_property()

Add a function to create a standards compliant rotation property.

Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Reviewed-by: Imre Deak <imre.deak@intel.com>
Acked-by: Dave Airlie <airlied@linux.ie>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>

2 files changed, 20 insertions, 0 deletions

diff --git a/drivers/gpu/drm/drm_crtc.c b/drivers/gpu/drm/drm_crtc.c
index 2fbee61d632d..f224d4d1c0ed 100644
--- a/drivers/gpu/drm/drm_crtc.c
+++ b/drivers/gpu/drm/drm_crtc.c
@@ -4959,3 +4959,21 @@ void drm_mode_config_cleanup(struct drm_device *dev)
         drm_modeset_lock_fini(&dev->mode_config.connection_mutex);
 }
 EXPORT_SYMBOL(drm_mode_config_cleanup);
+
+struct drm_property *drm_mode_create_rotation_property(struct drm_device *dev,
+                                                       unsigned int supported_rotations)
+{
+        static const struct drm_prop_enum_list props[] = {
+                { DRM_ROTATE_0,   "rotate-0" },
+                { DRM_ROTATE_90,  "rotate-90" },
+                { DRM_ROTATE_180, "rotate-180" },
+                { DRM_ROTATE_270, "rotate-270" },
+                { DRM_REFLECT_X,  "reflect-x" },
+                { DRM_REFLECT_Y,  "reflect-y" },
+        };
+
+        return drm_property_create_bitmask(dev, 0, "rotation",
+                                           props, ARRAY_SIZE(props),
+                                           supported_rotations);
+}
+EXPORT_SYMBOL(drm_mode_create_rotation_property);
diff --git a/include/drm/drm_crtc.h b/include/drm/drm_crtc.h
index cb4850a2b0c1..f7b383bcb6b6 100644
--- a/include/drm/drm_crtc.h
+++ b/include/drm/drm_crtc.h
@@ -1113,6 +1113,8 @@ extern int drm_format_plane_cpp(uint32_t format, int plane);
 extern int drm_format_horz_chroma_subsampling(uint32_t format);
 extern int drm_format_vert_chroma_subsampling(uint32_t format);
 extern const char *drm_get_format_name(uint32_t format);
+extern struct drm_property *drm_mode_create_rotation_property(struct drm_device *dev,
+                                                              unsigned int supported_rotations);
 
 /* Helpers */