1 files changed, 69 insertions, 0 deletions
diff --git a/drivers/gpu/drm/amd/display/dc/dml/dcn32/display_mode_vba_util_32.c b/drivers/gpu/drm/amd/display/dc/dml/dcn32/display_mode_vba_util_32.c
index debe46b24a3e..5af601cff1a0 100644
--- a/drivers/gpu/drm/amd/display/dc/dml/dcn32/display_mode_vba_util_32.c
+++ b/drivers/gpu/drm/amd/display/dc/dml/dcn32/display_mode_vba_util_32.c
@@ -6228,3 +6228,72 @@ void dml32_CalculateImmediateFlipBandwithSupport(unsigned int NumberOfActiveSurf
 	*ImmediateFlipBandwidthSupport = (*TotalBandwidth <= ReturnBW);
 	*FractionOfUrgentBandwidth = *TotalBandwidth / ReturnBW;
 }
+
+bool dml32_CalculateDETSwathFillLatencyHiding(unsigned int NumberOfActiveSurfaces,
+		double ReturnBW,
+		double UrgentLatency,
+		unsigned int SwathHeightY[],
+		unsigned int SwathHeightC[],
+		unsigned int SwathWidthY[],
+		unsigned int SwathWidthC[],
+		double  BytePerPixelInDETY[],
+		double  BytePerPixelInDETC[],
+		unsigned int    DETBufferSizeY[],
+		unsigned int    DETBufferSizeC[],
+		unsigned int	NumOfDPP[],
+		unsigned int	HTotal[],
+		double	PixelClock[],
+		double	VRatioY[],
+		double	VRatioC[],
+		enum dm_use_mall_for_pstate_change_mode UsesMALLForPStateChange[DC__NUM_DPP__MAX])
+{
+	int k;
+	double SwathSizeAllSurfaces = 0;
+	double SwathSizeAllSurfacesInFetchTimeUs;
+	double DETSwathLatencyHidingUs;
+	double DETSwathLatencyHidingYUs;
+	double DETSwathLatencyHidingCUs;
+	double SwathSizePerSurfaceY[DC__NUM_DPP__MAX];
+	double SwathSizePerSurfaceC[DC__NUM_DPP__MAX];
+	bool NotEnoughDETSwathFillLatencyHiding = false;
+
+	/* calculate sum of single swath size for all pipes in bytes*/
+	for (k = 0; k < NumberOfActiveSurfaces; k++) {
+		SwathSizePerSurfaceY[k] += SwathHeightY[k] * SwathWidthY[k] * BytePerPixelInDETY[k] * NumOfDPP[k];
+
+		if (SwathHeightC[k] != 0)
+			SwathSizePerSurfaceC[k] += SwathHeightC[k] * SwathWidthC[k] * BytePerPixelInDETC[k] * NumOfDPP[k];
+		else
+			SwathSizePerSurfaceC[k] = 0;
+
+		SwathSizeAllSurfaces += SwathSizePerSurfaceY[k] + SwathSizePerSurfaceC[k];
+	}
+
+	SwathSizeAllSurfacesInFetchTimeUs = SwathSizeAllSurfaces / ReturnBW + UrgentLatency;
+
+	/* ensure all DET - 1 swath can hide a fetch for all surfaces */
+	for (k = 0; k < NumberOfActiveSurfaces; k++) {
+		double LineTime = HTotal[k] / PixelClock[k];
+
+		/* only care if surface is not phantom */
+		if (UsesMALLForPStateChange[k] != dm_use_mall_pstate_change_phantom_pipe) {
+			DETSwathLatencyHidingYUs = (dml_floor(DETBufferSizeY[k] / BytePerPixelInDETY[k] / SwathWidthY[k], 1.0) - SwathHeightY[k]) / VRatioY[k] * LineTime;
+
+			if (SwathHeightC[k] != 0) {
+				DETSwathLatencyHidingCUs = (dml_floor(DETBufferSizeC[k] / BytePerPixelInDETC[k] / SwathWidthC[k], 1.0) - SwathHeightC[k]) / VRatioC[k] * LineTime;
+
+				DETSwathLatencyHidingUs = dml_min(DETSwathLatencyHidingYUs, DETSwathLatencyHidingCUs);
+			} else {
+				DETSwathLatencyHidingUs = DETSwathLatencyHidingYUs;
+			}
+
+			/* DET must be able to hide time to fetch 1 swath for each surface */
+			if (DETSwathLatencyHidingUs < SwathSizeAllSurfacesInFetchTimeUs) {
+				NotEnoughDETSwathFillLatencyHiding = true;
+				break;
+			}
+		}
+	}
+
+	return NotEnoughDETSwathFillLatencyHiding;
+}