drm: rcar-du: Lift z-pos restriction on primary plane for Gen3

There's no reason to require the primary plane to always be at the
bottom of the stack, as the VSP supports arbitrary ordering of planes,
and the KMS API doesn't have such a requirement either. Lift the
restriction.

As the primary plane can now be positioned arbitrarily, enable control
of its alpha channel as well.

Signed-off-by: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>
Tested-by: Tomohito Esaki <etom@igel.co.jp>

diff --git a/drivers/gpu/drm/rcar-du/rcar_du_vsp.c b/drivers/gpu/drm/rcar-du/rcar_du_vsp.c
index f41a22d..dbc68cd 100644 (file)
--- a/drivers/gpu/drm/rcar-du/rcar_du_vsp.c
+++ b/drivers/gpu/drm/rcar-du/rcar_du_vsp.c
@@ -433,14 +433,9 @@ int rcar_du_vsp_init(struct rcar_du_vsp *vsp, struct device_node *np,
                drm_plane_helper_add(&plane->plane,
                                     &rcar_du_vsp_plane_helper_funcs);
 
-               if (type == DRM_PLANE_TYPE_PRIMARY) {
-                       drm_plane_create_zpos_immutable_property(&plane->plane,
-                                                                0);
-               } else {
-                       drm_plane_create_alpha_property(&plane->plane);
-                       drm_plane_create_zpos_property(&plane->plane, 1, 1,
-                                                      num_planes - 1);
-               }
+               drm_plane_create_alpha_property(&plane->plane);
+               drm_plane_create_zpos_property(&plane->plane, i, 0,
+                                              num_planes - 1);
 
                vsp->num_planes++;
        }