drm: Add support for optional per-plane rotation property

Not all planes on the system may support the same rotations/reflections,
so make it possible to create a separate property for each plane.
This way userspace gets told exactly which rotations/reflections are
possible for each plane.

v2: Add drm_plane_create_rotation_property() helper
v3: Drop the BIT(), __builtin_ffs(x) - 1,
    Moar WARNs for bad parameters
    Deal with superfluous code shuffling

Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk> (v1)
Reviewed-by: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Link: http://patchwork.freedesktop.org/patch/msgid/1474907460-10717-4-git-send-email-ville.syrjala@linux.intel.com

drivers/gpu/drm/drm_atomic.c

@@ -705,7 +705,8 @@ int drm_atomic_plane_set_property(struct drm_plane *plane,
 		state->src_w = val;
 	} else if (property == config->prop_src_h) {
 		state->src_h = val;
-	} else if (property == config->rotation_property) {
+	} else if (property == config->rotation_property ||
+		   property == plane->rotation_property) {
 		if (!is_power_of_2(val & DRM_ROTATE_MASK))
 			return -EINVAL;
 		state->rotation = val;
@@ -765,7 +766,8 @@ drm_atomic_plane_get_property(struct drm_plane *plane,
 		*val = state->src_w;
 	} else if (property == config->prop_src_h) {
 		*val = state->src_h;
-	} else if (property == config->rotation_property) {
+	} else if (property == config->rotation_property ||
+		   property == plane->rotation_property) {
 		*val = state->rotation;
 	} else if (property == plane->zpos_property) {
 		*val = state->zpos;

drivers/gpu/drm/drm_blend.c

@@ -162,6 +162,41 @@ struct drm_property *drm_mode_create_rotation_property(struct drm_device *dev,
 }
 EXPORT_SYMBOL(drm_mode_create_rotation_property);
 
+int drm_plane_create_rotation_property(struct drm_plane *plane,
+				       unsigned int rotation,
+				       unsigned int supported_rotations)
+{
+	static const struct drm_prop_enum_list props[] = {
+		{ __builtin_ffs(DRM_ROTATE_0) - 1,   "rotate-0" },
+		{ __builtin_ffs(DRM_ROTATE_90) - 1,  "rotate-90" },
+		{ __builtin_ffs(DRM_ROTATE_180) - 1, "rotate-180" },
+		{ __builtin_ffs(DRM_ROTATE_270) - 1, "rotate-270" },
+		{ __builtin_ffs(DRM_REFLECT_X) - 1,  "reflect-x" },
+		{ __builtin_ffs(DRM_REFLECT_Y) - 1,  "reflect-y" },
+	};
+	struct drm_property *prop;
+
+	WARN_ON((supported_rotations & DRM_ROTATE_MASK) == 0);
+	WARN_ON(!is_power_of_2(rotation & DRM_ROTATE_MASK));
+	WARN_ON(rotation & ~supported_rotations);
+
+	prop = drm_property_create_bitmask(plane->dev, 0, "rotation",
+					   props, ARRAY_SIZE(props),
+					   supported_rotations);
+	if (!prop)
+		return -ENOMEM;
+
+	drm_object_attach_property(&plane->base, prop, rotation);
+
+	if (plane->state)
+		plane->state->rotation = rotation;
+
+	plane->rotation_property = prop;
+
+	return 0;
+}
+EXPORT_SYMBOL(drm_plane_create_rotation_property);
+
 /**
  * drm_rotation_simplify() - Try to simplify the rotation
  * @rotation: Rotation to be simplified

drivers/gpu/drm/drm_fb_helper.c

@@ -392,7 +392,11 @@ static int restore_fbdev_mode(struct drm_fb_helper *fb_helper)
 		if (plane->type != DRM_PLANE_TYPE_PRIMARY)
 			drm_plane_force_disable(plane);
 
-		if (dev->mode_config.rotation_property) {
+		if (plane->rotation_property) {
+			drm_mode_plane_set_obj_prop(plane,
+						    plane->rotation_property,
+						    DRM_ROTATE_0);
+		} else if (dev->mode_config.rotation_property) {
 			drm_mode_plane_set_obj_prop(plane,
 						    dev->mode_config.rotation_property,
 						    DRM_ROTATE_0);

include/drm/drm_blend.h

@@ -54,6 +54,9 @@ static inline bool drm_rotation_90_or_270(unsigned int rotation)
 
 struct drm_property *drm_mode_create_rotation_property(struct drm_device *dev,
 						       unsigned int supported_rotations);
+int drm_plane_create_rotation_property(struct drm_plane *plane,
+				       unsigned int rotation,
+				       unsigned int supported_rotations);
 unsigned int drm_rotation_simplify(unsigned int rotation,
 				   unsigned int supported_rotations);
 

include/drm/drm_plane.h

@@ -385,6 +385,7 @@ enum drm_plane_type {
  * @type: type of plane (overlay, primary, cursor)
  * @state: current atomic state for this plane
  * @zpos_property: zpos property for this plane
+ * @rotation_property: rotation property for this plane
  * @helper_private: mid-layer private data
  */
 struct drm_plane {
@@ -431,6 +432,7 @@ struct drm_plane {
 	struct drm_plane_state *state;
 
 	struct drm_property *zpos_property;
+	struct drm_property *rotation_property;
 };
 
 #define obj_to_plane(x) container_of(x, struct drm_plane, base)