drm/nouveau/kms/gv100-: attach alpha property to planes

Signed-off-by: Ben Skeggs <bskeggs@redhat.com>

drivers/gpu/drm/nouveau/dispnv50/atom.h

@@ -223,6 +223,7 @@ struct nv50_wndw_atom {
 
 	struct {
 		u8 depth;
+		u8 k1;
 	} blend;
 
 	union nv50_wndw_atom_mask {

drivers/gpu/drm/nouveau/dispnv50/wndw.c

@@ -288,6 +288,7 @@ nv50_wndw_atomic_check_acquire(struct nv50_wndw *wndw, bool modeset,
 
 	if (wndw->func->blend_set) {
 		asyw->blend.depth = 255 - asyw->state.normalized_zpos;
+		asyw->blend.k1 = asyw->state.alpha >> 8;
 		if (memcmp(&armw->blend, &asyw->blend, sizeof(asyw->blend)))
 			asyw->set.blend = true;
 	}
@@ -656,6 +657,10 @@ nv50_wndw_new_(const struct nv50_wndw_func *func, struct drm_device *dev,
 				nv50_wndw_zpos_default(&wndw->plane), 0, 254);
 		if (ret)
 			return ret;
+
+		ret = drm_plane_create_alpha_property(&wndw->plane);
+		if (ret)
+			return ret;
 	} else {
 		ret = drm_plane_create_zpos_immutable_property(&wndw->plane,
 				nv50_wndw_zpos_default(&wndw->plane));

drivers/gpu/drm/nouveau/dispnv50/wndwc37e.c

@@ -88,7 +88,7 @@ wndwc37e_blend_set(struct nv50_wndw *wndw, struct nv50_wndw_atom *asyw)
 	if ((push = evo_wait(&wndw->wndw, 8))) {
 		evo_mthd(push, 0x02ec, 7);
 		evo_data(push, asyw->blend.depth << 4);
-		evo_data(push, 0x000000ff);
+		evo_data(push, asyw->blend.k1);
 		evo_data(push, 0x00007722);
 		evo_data(push, 0xffff0000);
 		evo_data(push, 0xffff0000);