drm/amd/display: adding pathway to retrieve stutter period

why:
some functions may need be dependent on stutter period in the future

how:
Extract from stutter calculations and place into perf_params structure
Signed-off-by: Martin Leung <martin.leung@amd.com>
Acked-by: Aurabindo Pillai <aurabindo.pillai@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/display/dc/dcn30/dcn30_resource.c

@@ -2210,6 +2210,9 @@ static void dcn30_calculate_wm(
 	context->bw_ctx.bw.dcn.watermarks.a.frac_urg_bw_flip = get_fraction_of_urgent_bandwidth_imm_flip(&context->bw_ctx.dml, pipes, pipe_cnt) * 1000;
 	context->bw_ctx.bw.dcn.watermarks.a.urgent_latency_ns = get_urgent_latency(&context->bw_ctx.dml, pipes, pipe_cnt) * 1000;
 
+	context->perf_params.stutter_period_us =
+		context->bw_ctx.dml.vba.StutterPeriod;
+
 	for (i = 0, pipe_idx = 0; i < dc->res_pool->pipe_count; i++) {
 		if (!context->res_ctx.pipe_ctx[i].stream)
 			continue;

drivers/gpu/drm/amd/display/dc/dml/dcn30/display_mode_vba_30.c

@@ -597,7 +597,8 @@ static void CalculateStutterEfficiency(
 		double meta_row_bw[],
 		double dpte_row_bw[],
 		double *StutterEfficiencyNotIncludingVBlank,
-		double *StutterEfficiency);
+		double *StutterEfficiency,
+		double *StutterPeriodOut);
 
 static void CalculateSwathAndDETConfiguration(
 		bool ForceSingleDPP,
@@ -3134,7 +3135,8 @@ static void DISPCLKDPPCLKDCFCLKDeepSleepPrefetchParametersWatermarksAndPerforman
 			v->meta_row_bw,
 			v->dpte_row_bw,
 			&v->StutterEfficiencyNotIncludingVBlank,
-			&v->StutterEfficiency);
+			&v->StutterEfficiency,
+			&v->StutterPeriod);
 }
 
 static void DisplayPipeConfiguration(struct display_mode_lib *mode_lib)
@@ -6151,7 +6153,8 @@ static void CalculateStutterEfficiency(
 		double meta_row_bw[],
 		double dpte_row_bw[],
 		double *StutterEfficiencyNotIncludingVBlank,
-		double *StutterEfficiency)
+		double *StutterEfficiency,
+		double *StutterPeriodOut)
 {
 	double FullDETBufferingTimeY[DC__NUM_DPP__MAX] = { 0 };
 	double FrameTimeForMinFullDETBufferingTime = 0;
@@ -6262,6 +6265,9 @@ static void CalculateStutterEfficiency(
 	}
 
 	*StutterEfficiency =  (*StutterEfficiencyNotIncludingVBlank / 100.0 * (FrameTimeForMinFullDETBufferingTime - SmallestVBlank) + SmallestVBlank) / FrameTimeForMinFullDETBufferingTime * 100;
+
+	if (StutterPeriodOut)
+		*StutterPeriodOut = StutterPeriod;
 }
 
 static void CalculateSwathAndDETConfiguration(

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

@@ -411,6 +411,10 @@ struct dc_state {
 	struct clk_mgr *clk_mgr;
 
 	struct kref refcount;
+
+	struct {
+		unsigned int stutter_period_us;
+	} perf_params;
 };
 
 #endif /* _CORE_TYPES_H_ */