drm/amd/display: Add a variable to update FCLK latency

[Description]
Add a variable to update FCLK latency
Reviewed-by: Martin Leung <Martin.Leung@amd.com>
Acked-by: Tom Chung <chiahsuan.chung@amd.com>
Signed-off-by: Alvin Lee <alvin.lee2@amd.com>
Tested-by: Daniel Wheeler <daniel.wheeler@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

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

@@ -609,6 +609,7 @@ struct dc_bounding_box_overrides {
 	int percent_of_ideal_drambw;
 	int dram_clock_change_latency_ns;
 	int dummy_clock_change_latency_ns;
+	int fclk_clock_change_latency_ns;
 	/* This forces a hard min on the DCFCLK we use
 	 * for DML.  Unlike the debug option for forcing
 	 * DCFCLK, this override affects watermark calculations

drivers/gpu/drm/amd/display/dc/dml/dcn32/dcn32_fpu.c

@@ -2098,6 +2098,13 @@ void dcn32_update_bw_bounding_box_fpu(struct dc *dc, struct clk_bw_params *bw_pa
 				dc->bb_overrides.dram_clock_change_latency_ns / 1000.0;
 		}
 
+		if ((int)(dcn3_2_soc.fclk_change_latency_us * 1000)
+				!= dc->bb_overrides.fclk_clock_change_latency_ns
+				&& dc->bb_overrides.fclk_clock_change_latency_ns) {
+			dcn3_2_soc.fclk_change_latency_us =
+				dc->bb_overrides.fclk_clock_change_latency_ns / 1000;
+		}
+
 		if ((int)(dcn3_2_soc.dummy_pstate_latency_us * 1000)
 				!= dc->bb_overrides.dummy_clock_change_latency_ns
 				&& dc->bb_overrides.dummy_clock_change_latency_ns) {

drivers/gpu/drm/amd/display/dc/dml/dcn321/dcn321_fpu.c

@@ -498,6 +498,13 @@ void dcn321_update_bw_bounding_box_fpu(struct dc *dc, struct clk_bw_params *bw_p
 				dc->bb_overrides.dram_clock_change_latency_ns / 1000.0;
 		}
 
+		if ((int)(dcn3_21_soc.fclk_change_latency_us * 1000)
+				!= dc->bb_overrides.fclk_clock_change_latency_ns
+				&& dc->bb_overrides.fclk_clock_change_latency_ns) {
+			dcn3_21_soc.fclk_change_latency_us =
+				dc->bb_overrides.fclk_clock_change_latency_ns / 1000;
+		}
+
 		if ((int)(dcn3_21_soc.dummy_pstate_latency_us * 1000)
 				!= dc->bb_overrides.dummy_clock_change_latency_ns
 				&& dc->bb_overrides.dummy_clock_change_latency_ns) {