core_dc->hwss.init_hw(core_dc);
 
        full_pipe_count = core_dc->res_pool->pipe_count;
-       if (core_dc->res_pool->underlay_pipe_index >= 0)
+       if (core_dc->res_pool->underlay_pipe_index != NO_UNDERLAY_PIPE)
                full_pipe_count--;
        core_dc->public.caps.max_streams = min(
                        full_pipe_count,
 
 
        pool->base.res_cap = &res_cap;
        pool->base.funcs = &dce100_res_pool_funcs;
-       pool->base.underlay_pipe_index = -1;
+       pool->base.underlay_pipe_index = NO_UNDERLAY_PIPE;
 
        bp = ctx->dc_bios;
 
        /*************************************************
        *  Resource + asic cap harcoding                *
        *************************************************/
-       pool->base.underlay_pipe_index = -1;
+       pool->base.underlay_pipe_index = NO_UNDERLAY_PIPE;
        pool->base.pipe_count = res_cap.num_timing_generator;
        dc->public.caps.max_downscale_ratio = 200;
        dc->public.caps.i2c_speed_in_khz = 40;
 
        /*************************************************
         *  Resource + asic cap harcoding                *
         *************************************************/
-       pool->base.underlay_pipe_index = -1;
+       pool->base.underlay_pipe_index = NO_UNDERLAY_PIPE;
        pool->base.pipe_count = pool->base.res_cap->num_timing_generator;
        dc->public.caps.max_downscale_ratio = 200;
        dc->public.caps.i2c_speed_in_khz = 100;
 
        /*************************************************
         *  Resource + asic cap harcoding                *
         *************************************************/
-       pool->base.underlay_pipe_index = -1;
+       pool->base.underlay_pipe_index = NO_UNDERLAY_PIPE;
        pool->base.pipe_count = res_cap.num_timing_generator;
        dc->public.caps.max_downscale_ratio = 200;
        dc->public.caps.i2c_speed_in_khz = 40;
 
        bool hdmi_audio_native;
 };
 
+#define NO_UNDERLAY_PIPE -1
+
 struct resource_pool {
        struct mem_input *mis[MAX_PIPES];
        struct input_pixel_processor *ipps[MAX_PIPES];