drm: omapdrm: Add zpos property

Create a standard zpos property for every plane as an alias to the
omapdrm-specific zorder property. Unlike the zorder property that has to
be instantiated for both planes and CRTCs due to backward compatibility,
the zpos property is only instantiated for planes. When userspace will
have switched to the zpos property the zorder property will be removed.

Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ti.com>

drivers/gpu/drm/omapdrm/omap_drv.c

@@ -178,8 +178,10 @@ cleanup:
 static int omap_modeset_init_properties(struct drm_device *dev)
 {
 	struct omap_drm_private *priv = dev->dev_private;
+	unsigned int num_planes = priv->dispc_ops->get_num_ovls();
 
-	priv->zorder_prop = drm_property_create_range(dev, 0, "zorder", 0, 3);
+	priv->zorder_prop = drm_property_create_range(dev, 0, "zorder", 0,
+						      num_planes - 1);
 	if (!priv->zorder_prop)
 		return -ENOMEM;
 

drivers/gpu/drm/omapdrm/omap_plane.c

@@ -291,6 +291,7 @@ struct drm_plane *omap_plane_init(struct drm_device *dev,
 		u32 possible_crtcs)
 {
 	struct omap_drm_private *priv = dev->dev_private;
+	unsigned int num_planes = priv->dispc_ops->get_num_ovls();
 	struct drm_plane *plane;
 	struct omap_plane *omap_plane;
 	enum omap_plane_id id;
@@ -324,6 +325,7 @@ struct drm_plane *omap_plane_init(struct drm_device *dev,
 	drm_plane_helper_add(plane, &omap_plane_helper_funcs);
 
 	omap_plane_install_properties(plane, &plane->base);
+	drm_plane_create_zpos_property(plane, 0, 0, num_planes - 1);
 
 	return plane;