drm/amd/display: Fixing stream allocation regression

For certain dual display configs that had one display using a 1080p
mode, the DPM level used to drive the configs regressed from DPM 0 to
DPM 3. This was caused by a missing check that should have only limited
the pipe segments on non-phantom pipes. This caused issues with detile
buffer allocation, which dissallow subvp from being used
Tested-by: Daniel Wheeler <daniel.wheeler@amd.com>
Reviewed-by: Dillon Varone <dillon.varone@amd.com>
Reviewed-by: Martin Leung <martin.leung@amd.com>
Acked-by: Rodrigo Siqueira <rodrigo.siqueira@amd.com>
Signed-off-by: Relja Vojvodic <relja.vojvodic@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/display/dc/dcn32/dcn32_resource_helpers.c

@@ -276,7 +276,7 @@ static void override_det_for_subvp(struct dc *dc, struct dc_state *context, uint
 		for (i = 0; i < dc->res_pool->pipe_count; i++) {
 			struct pipe_ctx *pipe_ctx = &context->res_ctx.pipe_ctx[i];
 
-			if (pipe_ctx->stream && pipe_ctx->plane_state && dc_state_get_pipe_subvp_type(context, pipe_ctx)) {
+			if (pipe_ctx->stream && pipe_ctx->plane_state && dc_state_get_pipe_subvp_type(context, pipe_ctx) != SUBVP_PHANTOM) {
 				if (pipe_ctx->stream->timing.v_addressable == 1080 && pipe_ctx->stream->timing.h_addressable == 1920) {
 					if (pipe_segments[i] > 4)
 						pipe_segments[i] = 4;