Revert "drm/amd/display: reduce stack for dml32_CalculatePrefetchSchedule"

This reverts commit 86e4863e.

This commit was a part of a patchset responsible for reducing the stack
size. However, after some other changes, this commit becomes
unnecessary, so we are reverting it here.

Cc: Aurabindo Pillai <aurabindo.pillai@amd.com>
Reported-by: Stephen Rothwell <sfr@canb.auug.org.au>
Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Rodrigo Siqueira <Rodrigo.Siqueira@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/display/dc/dml/dcn32/display_mode_vba_32.c

@@ -757,9 +757,7 @@ static void DISPCLKDPPCLKDCFCLKDeepSleepPrefetchParametersWatermarksAndPerforman
 			v->dummy_vars.DISPCLKDPPCLKDCFCLKDeepSleepPrefetchParametersWatermarksAndPerformanceCalculation.myPipe.BytePerPixelY = v->BytePerPixelY[k];
 			v->dummy_vars.DISPCLKDPPCLKDCFCLKDeepSleepPrefetchParametersWatermarksAndPerformanceCalculation.myPipe.BytePerPixelC = v->BytePerPixelC[k];
 			v->dummy_vars.DISPCLKDPPCLKDCFCLKDeepSleepPrefetchParametersWatermarksAndPerformanceCalculation.myPipe.ProgressiveToInterlaceUnitInOPP = mode_lib->vba.ProgressiveToInterlaceUnitInOPP;
-			v->ErrorResult[k] = dml32_CalculatePrefetchSchedule(
-					&v->dummy_vars.dml32_CalculatePrefetchSchedule,
-					v->dummy_vars.DISPCLKDPPCLKDCFCLKDeepSleepPrefetchParametersWatermarksAndPerformanceCalculation.HostVMInefficiencyFactor,
+			v->ErrorResult[k] = dml32_CalculatePrefetchSchedule(v->dummy_vars.DISPCLKDPPCLKDCFCLKDeepSleepPrefetchParametersWatermarksAndPerformanceCalculation.HostVMInefficiencyFactor,
 					&v->dummy_vars.DISPCLKDPPCLKDCFCLKDeepSleepPrefetchParametersWatermarksAndPerformanceCalculation.myPipe, v->DSCDelay[k],
 					mode_lib->vba.DPPCLKDelaySubtotal + mode_lib->vba.DPPCLKDelayCNVCFormater,
 					mode_lib->vba.DPPCLKDelaySCL,
@@ -3266,7 +3264,6 @@ void dml32_ModeSupportAndSystemConfigurationFull(struct display_mode_lib *mode_l
 
 					mode_lib->vba.NoTimeForPrefetch[i][j][k] =
 						dml32_CalculatePrefetchSchedule(
-							&v->dummy_vars.dml32_CalculatePrefetchSchedule,
 							v->dummy_vars.dml32_ModeSupportAndSystemConfigurationFull.HostVMInefficiencyFactor,
 							&v->dummy_vars.dml32_ModeSupportAndSystemConfigurationFull.myPipe,
 							mode_lib->vba.DSCDelayPerState[i][k],

drivers/gpu/drm/amd/display/dc/dml/dcn32/display_mode_vba_util_32.h

@@ -715,7 +715,6 @@ double dml32_CalculateExtraLatency(
 		unsigned int HostVMMaxNonCachedPageTableLevels);
 
 bool dml32_CalculatePrefetchSchedule(
-		struct dml32_CalculatePrefetchSchedule *st_vars,
 		double HostVMInefficiencyFactor,
 		DmlPipe *myPipe,
 		unsigned int DSCDelay,

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

@@ -247,43 +247,6 @@ struct dml32_CalculateWatermarksMALLUseAndDRAMSpeedChangeSupport {
 	unsigned int LBLatencyHidingSourceLinesC[DC__NUM_DPP__MAX];
 };
 
-struct dml32_CalculatePrefetchSchedule {
-	unsigned int DPPCycles, DISPCLKCycles;
-	double DSTTotalPixelsAfterScaler;
-	double LineTime;
-	double dst_y_prefetch_equ;
-	double prefetch_bw_oto;
-	double Tvm_oto;
-	double Tr0_oto;
-	double Tvm_oto_lines;
-	double Tr0_oto_lines;
-	double dst_y_prefetch_oto;
-	double TimeForFetchingMetaPTE;
-	double TimeForFetchingRowInVBlank;
-	double LinesToRequestPrefetchPixelData;
-	unsigned int HostVMDynamicLevelsTrips;
-	double trip_to_mem;
-	double Tvm_trips;
-	double Tr0_trips;
-	double Tvm_trips_rounded;
-	double Tr0_trips_rounded;
-	double Lsw_oto;
-	double Tpre_rounded;
-	double prefetch_bw_equ;
-	double Tvm_equ;
-	double Tr0_equ;
-	double Tdmbf;
-	double Tdmec;
-	double Tdmsks;
-	double prefetch_sw_bytes;
-	double bytes_pp;
-	double dep_bytes;
-	unsigned int max_vratio_pre;
-	double min_Lsw;
-	double Tsw_est1;
-	double Tsw_est3;
-};
-
 struct DISPCLKDPPCLKDCFCLKDeepSleepPrefetchParametersWatermarksAndPerformanceCalculation {
 	unsigned int dummy_integer_array[2][DC__NUM_DPP__MAX];
 	double dummy_single_array[2][DC__NUM_DPP__MAX];
@@ -358,7 +321,6 @@ struct dummy_vars {
 	struct dml32_CalculateSwathAndDETConfiguration dml32_CalculateSwathAndDETConfiguration;
 	struct dml32_CalculateVMRowAndSwath dml32_CalculateVMRowAndSwath;
 	struct dml32_CalculateWatermarksMALLUseAndDRAMSpeedChangeSupport dml32_CalculateWatermarksMALLUseAndDRAMSpeedChangeSupport;
-	struct dml32_CalculatePrefetchSchedule dml32_CalculatePrefetchSchedule;
 };
 
 struct vba_vars_st {