drm/amd/display: Adding debug option to override Z8 watermark values

[Why & How]
Adding debug options to override Z8 watermark values for testing purposes.
Reviewed-by: Nicholas Kazlauskas <Nicholas.Kazlauskas@amd.com>
Acked-by: Alan Liu <HaoPing.Liu@amd.com>
Signed-off-by: Leo Chen <sancchen@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/display/dc/dc.h

@@ -700,6 +700,8 @@ struct dc_virtual_addr_space_config {
 struct dc_bounding_box_overrides {
 	int sr_exit_time_ns;
 	int sr_enter_plus_exit_time_ns;
+	int sr_exit_z8_time_ns;
+	int sr_enter_plus_exit_z8_time_ns;
 	int urgent_latency_ns;
 	int percent_of_ideal_drambw;
 	int dram_clock_change_latency_ns;
@@ -769,6 +771,8 @@ struct dc_debug_options {
 	int sr_enter_plus_exit_time_dpm0_ns;
 	int sr_exit_time_ns;
 	int sr_enter_plus_exit_time_ns;
+	int sr_exit_z8_time_ns;
+	int sr_enter_plus_exit_z8_time_ns;
 	int urgent_latency_ns;
 	uint32_t underflow_assert_delay_us;
 	int percent_of_ideal_drambw;

drivers/gpu/drm/amd/display/dc/dml/dcn20/dcn20_fpu.c

@@ -1890,6 +1890,17 @@ void dcn20_patch_bounding_box(struct dc *dc, struct _vcs_dpi_soc_bounding_box_st
 				dc->bb_overrides.sr_enter_plus_exit_time_ns / 1000.0;
 	}
 
+	if ((int)(bb->sr_exit_z8_time_us * 1000)
+				!= dc->bb_overrides.sr_exit_z8_time_ns
+			&& dc->bb_overrides.sr_exit_z8_time_ns) {
+		bb->sr_exit_z8_time_us = dc->bb_overrides.sr_exit_z8_time_ns / 1000.0;
+	}
+
+	if ((int)(bb->sr_enter_plus_exit_z8_time_us * 1000)
+				!= dc->bb_overrides.sr_enter_plus_exit_z8_time_ns
+			&& dc->bb_overrides.sr_enter_plus_exit_z8_time_ns) {
+		bb->sr_enter_plus_exit_z8_time_us = dc->bb_overrides.sr_enter_plus_exit_z8_time_ns / 1000.0;
+	}
 	if ((int)(bb->urgent_latency_us * 1000) != dc->bb_overrides.urgent_latency_ns
 			&& dc->bb_overrides.urgent_latency_ns) {
 		bb->urgent_latency_us = dc->bb_overrides.urgent_latency_ns / 1000.0;