disp: msm: stage layer with zorder 0 as base layer

Add support to stage layer with zorder 0 as base
layer and stage borderfill only during null commit.

Change-Id: I54356c1b7834227cc3da00c211e71ac5816ce51a
Signed-off-by: Krishna Manikandan <mkrishn@codeaurora.org>

msm/sde/sde_plane.c

@@ -3464,7 +3464,10 @@ static void _sde_plane_install_properties(struct drm_plane *plane,
 		if (catalog->mixer_count &&
 				catalog->mixer[0].sblk->maxblendstages) {
 			zpos_max = catalog->mixer[0].sblk->maxblendstages - 1;
-			if (zpos_max > SDE_STAGE_MAX - SDE_STAGE_0 - 1)
+			if (catalog->has_base_layer &&
+					(zpos_max > SDE_STAGE_MAX - 1))
+				zpos_max = SDE_STAGE_MAX - 1;
+			else if (zpos_max > SDE_STAGE_MAX - SDE_STAGE_0 - 1)
 				zpos_max = SDE_STAGE_MAX - SDE_STAGE_0 - 1;
 		}
 	} else if (plane->type != DRM_PLANE_TYPE_PRIMARY) {