Re: [PATCH 1/2] drm/amd/display: Reduce number of arguments of dml314's CalculateWatermarksAndDRAMSpeedChangeSupport()

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Hi Nathan,

On 9/16/22 18:06, Nathan Chancellor wrote:
> Most of the arguments are identical between the two call sites and they
> can be accessed through the 'struct vba_vars_st' pointer. This reduces
> the total amount of stack space that
> dml314_ModeSupportAndSystemConfigurationFull() uses by 240 bytes with
> LLVM 16 (2216 -> 1976), helping clear up the following clang warning:
> 
>   drivers/gpu/drm/amd/amdgpu/../display/dc/dml/dcn314/display_mode_vba_314.c:4020:6: error: stack frame size (2216) exceeds limit (2048) in 'dml314_ModeSupportAndSystemConfigurationFull' [-Werror,-Wframe-larger-than]
>   void dml314_ModeSupportAndSystemConfigurationFull(struct display_mode_lib *mode_lib)
>        ^
>   1 error generated.
> 
> Link: https://github.com/ClangBuiltLinux/linux/issues/1710
> Reported-by: "kernelci.org bot" <bot@xxxxxxxxxxxx>
> Signed-off-by: Nathan Chancellor <nathan@xxxxxxxxxx>

I have built-tested the whole series with clang 14.0.5 (Fedora
14.0.5-1.fc36), using:

$ make -kj"$(nproc)" ARCH=x86_64 LLVM=1 mrproper allmodconfig
drivers/gpu/drm/amd/amdgpu/

Another great patch to the DML! As Tom, I also would like to see this
expand to all display_mode_vba files, but so far this is great to
unbreak the build.

To the whole series:

Tested-by: Maíra Canal <mairacanal@xxxxxxxxxx>

Best Regards,
- Maíra Canal

> ---
> 
> This is just commit ab2ac59c32db ("drm/amd/display: Reduce number of
> arguments of dml31's CalculateWatermarksAndDRAMSpeedChangeSupport()")
> applied to dml314.
> 
>  .../dc/dml/dcn314/display_mode_vba_314.c      | 248 ++++--------------
>  1 file changed, 52 insertions(+), 196 deletions(-)
> 
> diff --git a/drivers/gpu/drm/amd/display/dc/dml/dcn314/display_mode_vba_314.c b/drivers/gpu/drm/amd/display/dc/dml/dcn314/display_mode_vba_314.c
> index 2829f179f982..32ceb72f7a14 100644
> --- a/drivers/gpu/drm/amd/display/dc/dml/dcn314/display_mode_vba_314.c
> +++ b/drivers/gpu/drm/amd/display/dc/dml/dcn314/display_mode_vba_314.c
> @@ -325,64 +325,28 @@ static void CalculateVupdateAndDynamicMetadataParameters(
>  static void CalculateWatermarksAndDRAMSpeedChangeSupport(
>  		struct display_mode_lib *mode_lib,
>  		unsigned int PrefetchMode,
> -		unsigned int NumberOfActivePlanes,
> -		unsigned int MaxLineBufferLines,
> -		unsigned int LineBufferSize,
> -		unsigned int WritebackInterfaceBufferSize,
>  		double DCFCLK,
>  		double ReturnBW,
> -		bool SynchronizedVBlank,
> -		unsigned int dpte_group_bytes[],
> -		unsigned int MetaChunkSize,
>  		double UrgentLatency,
>  		double ExtraLatency,
> -		double WritebackLatency,
> -		double WritebackChunkSize,
>  		double SOCCLK,
> -		double DRAMClockChangeLatency,
> -		double SRExitTime,
> -		double SREnterPlusExitTime,
> -		double SRExitZ8Time,
> -		double SREnterPlusExitZ8Time,
>  		double DCFCLKDeepSleep,
>  		unsigned int DETBufferSizeY[],
>  		unsigned int DETBufferSizeC[],
>  		unsigned int SwathHeightY[],
>  		unsigned int SwathHeightC[],
> -		unsigned int LBBitPerPixel[],
>  		double SwathWidthY[],
>  		double SwathWidthC[],
> -		double HRatio[],
> -		double HRatioChroma[],
> -		unsigned int vtaps[],
> -		unsigned int VTAPsChroma[],
> -		double VRatio[],
> -		double VRatioChroma[],
> -		unsigned int HTotal[],
> -		double PixelClock[],
> -		unsigned int BlendingAndTiming[],
>  		unsigned int DPPPerPlane[],
>  		double BytePerPixelDETY[],
>  		double BytePerPixelDETC[],
> -		double DSTXAfterScaler[],
> -		double DSTYAfterScaler[],
> -		bool WritebackEnable[],
> -		enum source_format_class WritebackPixelFormat[],
> -		double WritebackDestinationWidth[],
> -		double WritebackDestinationHeight[],
> -		double WritebackSourceHeight[],
>  		bool UnboundedRequestEnabled,
>  		unsigned int CompressedBufferSizeInkByte,
>  		enum clock_change_support *DRAMClockChangeSupport,
> -		double *UrgentWatermark,
> -		double *WritebackUrgentWatermark,
> -		double *DRAMClockChangeWatermark,
> -		double *WritebackDRAMClockChangeWatermark,
>  		double *StutterExitWatermark,
>  		double *StutterEnterPlusExitWatermark,
>  		double *Z8StutterExitWatermark,
> -		double *Z8StutterEnterPlusExitWatermark,
> -		double *MinActiveDRAMClockChangeLatencySupported);
> +		double *Z8StutterEnterPlusExitWatermark);
>  
>  static void CalculateDCFCLKDeepSleep(
>  		struct display_mode_lib *mode_lib,
> @@ -3041,64 +3005,28 @@ static void DISPCLKDPPCLKDCFCLKDeepSleepPrefetchParametersWatermarksAndPerforman
>  		CalculateWatermarksAndDRAMSpeedChangeSupport(
>  				mode_lib,
>  				PrefetchMode,
> -				v->NumberOfActivePlanes,
> -				v->MaxLineBufferLines,
> -				v->LineBufferSize,
> -				v->WritebackInterfaceBufferSize,
>  				v->DCFCLK,
>  				v->ReturnBW,
> -				v->SynchronizedVBlank,
> -				v->dpte_group_bytes,
> -				v->MetaChunkSize,
>  				v->UrgentLatency,
>  				v->UrgentExtraLatency,
> -				v->WritebackLatency,
> -				v->WritebackChunkSize,
>  				v->SOCCLK,
> -				v->DRAMClockChangeLatency,
> -				v->SRExitTime,
> -				v->SREnterPlusExitTime,
> -				v->SRExitZ8Time,
> -				v->SREnterPlusExitZ8Time,
>  				v->DCFCLKDeepSleep,
>  				v->DETBufferSizeY,
>  				v->DETBufferSizeC,
>  				v->SwathHeightY,
>  				v->SwathHeightC,
> -				v->LBBitPerPixel,
>  				v->SwathWidthY,
>  				v->SwathWidthC,
> -				v->HRatio,
> -				v->HRatioChroma,
> -				v->vtaps,
> -				v->VTAPsChroma,
> -				v->VRatio,
> -				v->VRatioChroma,
> -				v->HTotal,
> -				v->PixelClock,
> -				v->BlendingAndTiming,
>  				v->DPPPerPlane,
>  				v->BytePerPixelDETY,
>  				v->BytePerPixelDETC,
> -				v->DSTXAfterScaler,
> -				v->DSTYAfterScaler,
> -				v->WritebackEnable,
> -				v->WritebackPixelFormat,
> -				v->WritebackDestinationWidth,
> -				v->WritebackDestinationHeight,
> -				v->WritebackSourceHeight,
>  				v->UnboundedRequestEnabled,
>  				v->CompressedBufferSizeInkByte,
>  				&DRAMClockChangeSupport,
> -				&v->UrgentWatermark,
> -				&v->WritebackUrgentWatermark,
> -				&v->DRAMClockChangeWatermark,
> -				&v->WritebackDRAMClockChangeWatermark,
>  				&v->StutterExitWatermark,
>  				&v->StutterEnterPlusExitWatermark,
>  				&v->Z8StutterExitWatermark,
> -				&v->Z8StutterEnterPlusExitWatermark,
> -				&v->MinActiveDRAMClockChangeLatencySupported);
> +				&v->Z8StutterEnterPlusExitWatermark);
>  
>  		for (k = 0; k < v->NumberOfActivePlanes; ++k) {
>  			if (v->WritebackEnable[k] == true) {
> @@ -5496,64 +5424,28 @@ void dml314_ModeSupportAndSystemConfigurationFull(struct display_mode_lib *mode_
>  			CalculateWatermarksAndDRAMSpeedChangeSupport(
>  					mode_lib,
>  					v->PrefetchModePerState[i][j],
> -					v->NumberOfActivePlanes,
> -					v->MaxLineBufferLines,
> -					v->LineBufferSize,
> -					v->WritebackInterfaceBufferSize,
>  					v->DCFCLKState[i][j],
>  					v->ReturnBWPerState[i][j],
> -					v->SynchronizedVBlank,
> -					v->dpte_group_bytes,
> -					v->MetaChunkSize,
>  					v->UrgLatency[i],
>  					v->ExtraLatency,
> -					v->WritebackLatency,
> -					v->WritebackChunkSize,
>  					v->SOCCLKPerState[i],
> -					v->DRAMClockChangeLatency,
> -					v->SRExitTime,
> -					v->SREnterPlusExitTime,
> -					v->SRExitZ8Time,
> -					v->SREnterPlusExitZ8Time,
>  					v->ProjectedDCFCLKDeepSleep[i][j],
>  					v->DETBufferSizeYThisState,
>  					v->DETBufferSizeCThisState,
>  					v->SwathHeightYThisState,
>  					v->SwathHeightCThisState,
> -					v->LBBitPerPixel,
>  					v->SwathWidthYThisState,
>  					v->SwathWidthCThisState,
> -					v->HRatio,
> -					v->HRatioChroma,
> -					v->vtaps,
> -					v->VTAPsChroma,
> -					v->VRatio,
> -					v->VRatioChroma,
> -					v->HTotal,
> -					v->PixelClock,
> -					v->BlendingAndTiming,
>  					v->NoOfDPPThisState,
>  					v->BytePerPixelInDETY,
>  					v->BytePerPixelInDETC,
> -					v->DSTXAfterScaler,
> -					v->DSTYAfterScaler,
> -					v->WritebackEnable,
> -					v->WritebackPixelFormat,
> -					v->WritebackDestinationWidth,
> -					v->WritebackDestinationHeight,
> -					v->WritebackSourceHeight,
>  					UnboundedRequestEnabledThisState,
>  					CompressedBufferSizeInkByteThisState,
>  					&v->DRAMClockChangeSupport[i][j],
> -					&v->UrgentWatermark,
> -					&v->WritebackUrgentWatermark,
> -					&v->DRAMClockChangeWatermark,
> -					&v->WritebackDRAMClockChangeWatermark,
> -					&dummy,
>  					&dummy,
>  					&dummy,
>  					&dummy,
> -					&v->MinActiveDRAMClockChangeLatencySupported);
> +					&dummy);
>  		}
>  	}
>  
> @@ -5679,64 +5571,28 @@ void dml314_ModeSupportAndSystemConfigurationFull(struct display_mode_lib *mode_
>  static void CalculateWatermarksAndDRAMSpeedChangeSupport(
>  		struct display_mode_lib *mode_lib,
>  		unsigned int PrefetchMode,
> -		unsigned int NumberOfActivePlanes,
> -		unsigned int MaxLineBufferLines,
> -		unsigned int LineBufferSize,
> -		unsigned int WritebackInterfaceBufferSize,
>  		double DCFCLK,
>  		double ReturnBW,
> -		bool SynchronizedVBlank,
> -		unsigned int dpte_group_bytes[],
> -		unsigned int MetaChunkSize,
>  		double UrgentLatency,
>  		double ExtraLatency,
> -		double WritebackLatency,
> -		double WritebackChunkSize,
>  		double SOCCLK,
> -		double DRAMClockChangeLatency,
> -		double SRExitTime,
> -		double SREnterPlusExitTime,
> -		double SRExitZ8Time,
> -		double SREnterPlusExitZ8Time,
>  		double DCFCLKDeepSleep,
>  		unsigned int DETBufferSizeY[],
>  		unsigned int DETBufferSizeC[],
>  		unsigned int SwathHeightY[],
>  		unsigned int SwathHeightC[],
> -		unsigned int LBBitPerPixel[],
>  		double SwathWidthY[],
>  		double SwathWidthC[],
> -		double HRatio[],
> -		double HRatioChroma[],
> -		unsigned int vtaps[],
> -		unsigned int VTAPsChroma[],
> -		double VRatio[],
> -		double VRatioChroma[],
> -		unsigned int HTotal[],
> -		double PixelClock[],
> -		unsigned int BlendingAndTiming[],
>  		unsigned int DPPPerPlane[],
>  		double BytePerPixelDETY[],
>  		double BytePerPixelDETC[],
> -		double DSTXAfterScaler[],
> -		double DSTYAfterScaler[],
> -		bool WritebackEnable[],
> -		enum source_format_class WritebackPixelFormat[],
> -		double WritebackDestinationWidth[],
> -		double WritebackDestinationHeight[],
> -		double WritebackSourceHeight[],
>  		bool UnboundedRequestEnabled,
>  		unsigned int CompressedBufferSizeInkByte,
>  		enum clock_change_support *DRAMClockChangeSupport,
> -		double *UrgentWatermark,
> -		double *WritebackUrgentWatermark,
> -		double *DRAMClockChangeWatermark,
> -		double *WritebackDRAMClockChangeWatermark,
>  		double *StutterExitWatermark,
>  		double *StutterEnterPlusExitWatermark,
>  		double *Z8StutterExitWatermark,
> -		double *Z8StutterEnterPlusExitWatermark,
> -		double *MinActiveDRAMClockChangeLatencySupported)
> +		double *Z8StutterEnterPlusExitWatermark)
>  {
>  	struct vba_vars_st *v = &mode_lib->vba;
>  	double EffectiveLBLatencyHidingY;
> @@ -5756,103 +5612,103 @@ static void CalculateWatermarksAndDRAMSpeedChangeSupport(
>  	double TotalPixelBW = 0.0;
>  	int k, j;
>  
> -	*UrgentWatermark = UrgentLatency + ExtraLatency;
> +	v->UrgentWatermark = UrgentLatency + ExtraLatency;
>  
>  #ifdef __DML_VBA_DEBUG__
>  	dml_print("DML::%s: UrgentLatency = %f\n", __func__, UrgentLatency);
>  	dml_print("DML::%s: ExtraLatency = %f\n", __func__, ExtraLatency);
> -	dml_print("DML::%s: UrgentWatermark = %f\n", __func__, *UrgentWatermark);
> +	dml_print("DML::%s: UrgentWatermark = %f\n", __func__, v->UrgentWatermark);
>  #endif
>  
> -	*DRAMClockChangeWatermark = DRAMClockChangeLatency + *UrgentWatermark;
> +	v->DRAMClockChangeWatermark = v->DRAMClockChangeLatency + v->UrgentWatermark;
>  
>  #ifdef __DML_VBA_DEBUG__
> -	dml_print("DML::%s: DRAMClockChangeLatency = %f\n", __func__, DRAMClockChangeLatency);
> -	dml_print("DML::%s: DRAMClockChangeWatermark = %f\n", __func__, *DRAMClockChangeWatermark);
> +	dml_print("DML::%s: v->DRAMClockChangeLatency = %f\n", __func__, v->DRAMClockChangeLatency);
> +	dml_print("DML::%s: DRAMClockChangeWatermark = %f\n", __func__, v->DRAMClockChangeWatermark);
>  #endif
>  
>  	v->TotalActiveWriteback = 0;
> -	for (k = 0; k < NumberOfActivePlanes; ++k) {
> -		if (WritebackEnable[k] == true) {
> +	for (k = 0; k < v->NumberOfActivePlanes; ++k) {
> +		if (v->WritebackEnable[k] == true) {
>  			v->TotalActiveWriteback = v->TotalActiveWriteback + 1;
>  		}
>  	}
>  
>  	if (v->TotalActiveWriteback <= 1) {
> -		*WritebackUrgentWatermark = WritebackLatency;
> +		v->WritebackUrgentWatermark = v->WritebackLatency;
>  	} else {
> -		*WritebackUrgentWatermark = WritebackLatency + WritebackChunkSize * 1024.0 / 32.0 / SOCCLK;
> +		v->WritebackUrgentWatermark = v->WritebackLatency + v->WritebackChunkSize * 1024.0 / 32.0 / SOCCLK;
>  	}
>  
>  	if (v->TotalActiveWriteback <= 1) {
> -		*WritebackDRAMClockChangeWatermark = DRAMClockChangeLatency + WritebackLatency;
> +		v->WritebackDRAMClockChangeWatermark = v->DRAMClockChangeLatency + v->WritebackLatency;
>  	} else {
> -		*WritebackDRAMClockChangeWatermark = DRAMClockChangeLatency + WritebackLatency + WritebackChunkSize * 1024.0 / 32.0 / SOCCLK;
> +		v->WritebackDRAMClockChangeWatermark = v->DRAMClockChangeLatency + v->WritebackLatency + v->WritebackChunkSize * 1024.0 / 32.0 / SOCCLK;
>  	}
>  
> -	for (k = 0; k < NumberOfActivePlanes; ++k) {
> +	for (k = 0; k < v->NumberOfActivePlanes; ++k) {
>  		TotalPixelBW = TotalPixelBW
> -				+ DPPPerPlane[k] * (SwathWidthY[k] * BytePerPixelDETY[k] * VRatio[k] + SwathWidthC[k] * BytePerPixelDETC[k] * VRatioChroma[k])
> -						/ (HTotal[k] / PixelClock[k]);
> +				+ DPPPerPlane[k] * (SwathWidthY[k] * BytePerPixelDETY[k] * v->VRatio[k] + SwathWidthC[k] * BytePerPixelDETC[k] * v->VRatioChroma[k])
> +						/ (v->HTotal[k] / v->PixelClock[k]);
>  	}
>  
> -	for (k = 0; k < NumberOfActivePlanes; ++k) {
> +	for (k = 0; k < v->NumberOfActivePlanes; ++k) {
>  		double EffectiveDETBufferSizeY = DETBufferSizeY[k];
>  
>  		v->LBLatencyHidingSourceLinesY = dml_min(
> -				(double) MaxLineBufferLines,
> -				dml_floor(LineBufferSize / LBBitPerPixel[k] / (SwathWidthY[k] / dml_max(HRatio[k], 1.0)), 1)) - (vtaps[k] - 1);
> +				(double) v->MaxLineBufferLines,
> +				dml_floor(v->LineBufferSize / v->LBBitPerPixel[k] / (SwathWidthY[k] / dml_max(v->HRatio[k], 1.0)), 1)) - (v->vtaps[k] - 1);
>  
>  		v->LBLatencyHidingSourceLinesC = dml_min(
> -				(double) MaxLineBufferLines,
> -				dml_floor(LineBufferSize / LBBitPerPixel[k] / (SwathWidthC[k] / dml_max(HRatioChroma[k], 1.0)), 1)) - (VTAPsChroma[k] - 1);
> +				(double) v->MaxLineBufferLines,
> +				dml_floor(v->LineBufferSize / v->LBBitPerPixel[k] / (SwathWidthC[k] / dml_max(v->HRatioChroma[k], 1.0)), 1)) - (v->VTAPsChroma[k] - 1);
>  
> -		EffectiveLBLatencyHidingY = v->LBLatencyHidingSourceLinesY / VRatio[k] * (HTotal[k] / PixelClock[k]);
> +		EffectiveLBLatencyHidingY = v->LBLatencyHidingSourceLinesY / v->VRatio[k] * (v->HTotal[k] / v->PixelClock[k]);
>  
> -		EffectiveLBLatencyHidingC = v->LBLatencyHidingSourceLinesC / VRatioChroma[k] * (HTotal[k] / PixelClock[k]);
> +		EffectiveLBLatencyHidingC = v->LBLatencyHidingSourceLinesC / v->VRatioChroma[k] * (v->HTotal[k] / v->PixelClock[k]);
>  
>  		if (UnboundedRequestEnabled) {
>  			EffectiveDETBufferSizeY = EffectiveDETBufferSizeY
> -					+ CompressedBufferSizeInkByte * 1024 * SwathWidthY[k] * BytePerPixelDETY[k] * VRatio[k] / (HTotal[k] / PixelClock[k]) / TotalPixelBW;
> +					+ CompressedBufferSizeInkByte * 1024 * SwathWidthY[k] * BytePerPixelDETY[k] * v->VRatio[k] / (v->HTotal[k] / v->PixelClock[k]) / TotalPixelBW;
>  		}
>  
>  		LinesInDETY[k] = (double) EffectiveDETBufferSizeY / BytePerPixelDETY[k] / SwathWidthY[k];
>  		LinesInDETYRoundedDownToSwath[k] = dml_floor(LinesInDETY[k], SwathHeightY[k]);
> -		FullDETBufferingTimeY = LinesInDETYRoundedDownToSwath[k] * (HTotal[k] / PixelClock[k]) / VRatio[k];
> +		FullDETBufferingTimeY = LinesInDETYRoundedDownToSwath[k] * (v->HTotal[k] / v->PixelClock[k]) / v->VRatio[k];
>  		if (BytePerPixelDETC[k] > 0) {
>  			LinesInDETC = v->DETBufferSizeC[k] / BytePerPixelDETC[k] / SwathWidthC[k];
>  			LinesInDETCRoundedDownToSwath = dml_floor(LinesInDETC, SwathHeightC[k]);
> -			FullDETBufferingTimeC = LinesInDETCRoundedDownToSwath * (HTotal[k] / PixelClock[k]) / VRatioChroma[k];
> +			FullDETBufferingTimeC = LinesInDETCRoundedDownToSwath * (v->HTotal[k] / v->PixelClock[k]) / v->VRatioChroma[k];
>  		} else {
>  			LinesInDETC = 0;
>  			FullDETBufferingTimeC = 999999;
>  		}
>  
>  		ActiveDRAMClockChangeLatencyMarginY = EffectiveLBLatencyHidingY + FullDETBufferingTimeY
> -				- ((double) DSTXAfterScaler[k] / HTotal[k] + DSTYAfterScaler[k]) * HTotal[k] / PixelClock[k] - *UrgentWatermark - *DRAMClockChangeWatermark;
> +				- ((double) v->DSTXAfterScaler[k] / v->HTotal[k] + v->DSTYAfterScaler[k]) * v->HTotal[k] / v->PixelClock[k] - v->UrgentWatermark - v->DRAMClockChangeWatermark;
>  
> -		if (NumberOfActivePlanes > 1) {
> +		if (v->NumberOfActivePlanes > 1) {
>  			ActiveDRAMClockChangeLatencyMarginY = ActiveDRAMClockChangeLatencyMarginY
> -					- (1 - 1.0 / NumberOfActivePlanes) * SwathHeightY[k] * HTotal[k] / PixelClock[k] / VRatio[k];
> +					- (1 - 1.0 / v->NumberOfActivePlanes) * SwathHeightY[k] * v->HTotal[k] / v->PixelClock[k] / v->VRatio[k];
>  		}
>  
>  		if (BytePerPixelDETC[k] > 0) {
>  			ActiveDRAMClockChangeLatencyMarginC = EffectiveLBLatencyHidingC + FullDETBufferingTimeC
> -					- ((double) DSTXAfterScaler[k] / HTotal[k] + DSTYAfterScaler[k]) * HTotal[k] / PixelClock[k] - *UrgentWatermark - *DRAMClockChangeWatermark;
> +					- ((double) v->DSTXAfterScaler[k] / v->HTotal[k] + v->DSTYAfterScaler[k]) * v->HTotal[k] / v->PixelClock[k] - v->UrgentWatermark - v->DRAMClockChangeWatermark;
>  
> -			if (NumberOfActivePlanes > 1) {
> +			if (v->NumberOfActivePlanes > 1) {
>  				ActiveDRAMClockChangeLatencyMarginC = ActiveDRAMClockChangeLatencyMarginC
> -						- (1 - 1.0 / NumberOfActivePlanes) * SwathHeightC[k] * HTotal[k] / PixelClock[k] / VRatioChroma[k];
> +						- (1 - 1.0 / v->NumberOfActivePlanes) * SwathHeightC[k] * v->HTotal[k] / v->PixelClock[k] / v->VRatioChroma[k];
>  			}
>  			v->ActiveDRAMClockChangeLatencyMargin[k] = dml_min(ActiveDRAMClockChangeLatencyMarginY, ActiveDRAMClockChangeLatencyMarginC);
>  		} else {
>  			v->ActiveDRAMClockChangeLatencyMargin[k] = ActiveDRAMClockChangeLatencyMarginY;
>  		}
>  
> -		if (WritebackEnable[k] == true) {
> -			WritebackDRAMClockChangeLatencyHiding = WritebackInterfaceBufferSize * 1024
> -					/ (WritebackDestinationWidth[k] * WritebackDestinationHeight[k] / (WritebackSourceHeight[k] * HTotal[k] / PixelClock[k]) * 4);
> -			if (WritebackPixelFormat[k] == dm_444_64) {
> +		if (v->WritebackEnable[k] == true) {
> +			WritebackDRAMClockChangeLatencyHiding = v->WritebackInterfaceBufferSize * 1024
> +					/ (v->WritebackDestinationWidth[k] * v->WritebackDestinationHeight[k] / (v->WritebackSourceHeight[k] * v->HTotal[k] / v->PixelClock[k]) * 4);
> +			if (v->WritebackPixelFormat[k] == dm_444_64) {
>  				WritebackDRAMClockChangeLatencyHiding = WritebackDRAMClockChangeLatencyHiding / 2;
>  			}
>  			WritebackDRAMClockChangeLatencyMargin = WritebackDRAMClockChangeLatencyHiding - v->WritebackDRAMClockChangeWatermark;
> @@ -5862,14 +5718,14 @@ static void CalculateWatermarksAndDRAMSpeedChangeSupport(
>  
>  	v->MinActiveDRAMClockChangeMargin = 999999;
>  	PlaneWithMinActiveDRAMClockChangeMargin = 0;
> -	for (k = 0; k < NumberOfActivePlanes; ++k) {
> +	for (k = 0; k < v->NumberOfActivePlanes; ++k) {
>  		if (v->ActiveDRAMClockChangeLatencyMargin[k] < v->MinActiveDRAMClockChangeMargin) {
>  			v->MinActiveDRAMClockChangeMargin = v->ActiveDRAMClockChangeLatencyMargin[k];
> -			if (BlendingAndTiming[k] == k) {
> +			if (v->BlendingAndTiming[k] == k) {
>  				PlaneWithMinActiveDRAMClockChangeMargin = k;
>  			} else {
> -				for (j = 0; j < NumberOfActivePlanes; ++j) {
> -					if (BlendingAndTiming[k] == j) {
> +				for (j = 0; j < v->NumberOfActivePlanes; ++j) {
> +					if (v->BlendingAndTiming[k] == j) {
>  						PlaneWithMinActiveDRAMClockChangeMargin = j;
>  					}
>  				}
> @@ -5877,11 +5733,11 @@ static void CalculateWatermarksAndDRAMSpeedChangeSupport(
>  		}
>  	}
>  
> -	*MinActiveDRAMClockChangeLatencySupported = v->MinActiveDRAMClockChangeMargin + DRAMClockChangeLatency;
> +	v->MinActiveDRAMClockChangeLatencySupported = v->MinActiveDRAMClockChangeMargin + v->DRAMClockChangeLatency ;
>  
>  	SecondMinActiveDRAMClockChangeMarginOneDisplayInVBLank = 999999;
> -	for (k = 0; k < NumberOfActivePlanes; ++k) {
> -		if (!((k == PlaneWithMinActiveDRAMClockChangeMargin) && (BlendingAndTiming[k] == k)) && !(BlendingAndTiming[k] == PlaneWithMinActiveDRAMClockChangeMargin)
> +	for (k = 0; k < v->NumberOfActivePlanes; ++k) {
> +		if (!((k == PlaneWithMinActiveDRAMClockChangeMargin) && (v->BlendingAndTiming[k] == k)) && !(v->BlendingAndTiming[k] == PlaneWithMinActiveDRAMClockChangeMargin)
>  				&& v->ActiveDRAMClockChangeLatencyMargin[k] < SecondMinActiveDRAMClockChangeMarginOneDisplayInVBLank) {
>  			SecondMinActiveDRAMClockChangeMarginOneDisplayInVBLank = v->ActiveDRAMClockChangeLatencyMargin[k];
>  		}
> @@ -5889,25 +5745,25 @@ static void CalculateWatermarksAndDRAMSpeedChangeSupport(
>  
>  	v->TotalNumberOfActiveOTG = 0;
>  
> -	for (k = 0; k < NumberOfActivePlanes; ++k) {
> -		if (BlendingAndTiming[k] == k) {
> +	for (k = 0; k < v->NumberOfActivePlanes; ++k) {
> +		if (v->BlendingAndTiming[k] == k) {
>  			v->TotalNumberOfActiveOTG = v->TotalNumberOfActiveOTG + 1;
>  		}
>  	}
>  
>  	if (v->MinActiveDRAMClockChangeMargin > 0 && PrefetchMode == 0) {
>  		*DRAMClockChangeSupport = dm_dram_clock_change_vactive;
> -	} else if ((SynchronizedVBlank == true || v->TotalNumberOfActiveOTG == 1
> +	} else if ((v->SynchronizedVBlank == true || v->TotalNumberOfActiveOTG == 1
>  			|| SecondMinActiveDRAMClockChangeMarginOneDisplayInVBLank > 0) && PrefetchMode == 0) {
>  		*DRAMClockChangeSupport = dm_dram_clock_change_vblank;
>  	} else {
>  		*DRAMClockChangeSupport = dm_dram_clock_change_unsupported;
>  	}
>  
> -	*StutterExitWatermark = SRExitTime + ExtraLatency + 10 / DCFCLKDeepSleep;
> -	*StutterEnterPlusExitWatermark = (SREnterPlusExitTime + ExtraLatency + 10 / DCFCLKDeepSleep);
> -	*Z8StutterExitWatermark = SRExitZ8Time + ExtraLatency + 10 / DCFCLKDeepSleep;
> -	*Z8StutterEnterPlusExitWatermark = SREnterPlusExitZ8Time + ExtraLatency + 10 / DCFCLKDeepSleep;
> +	*StutterExitWatermark = v->SRExitTime + ExtraLatency + 10 / DCFCLKDeepSleep;
> +	*StutterEnterPlusExitWatermark = (v->SREnterPlusExitTime + ExtraLatency + 10 / DCFCLKDeepSleep);
> +	*Z8StutterExitWatermark = v->SRExitZ8Time + ExtraLatency + 10 / DCFCLKDeepSleep;
> +	*Z8StutterEnterPlusExitWatermark = v->SREnterPlusExitZ8Time + ExtraLatency + 10 / DCFCLKDeepSleep;
>  
>  #ifdef __DML_VBA_DEBUG__
>  	dml_print("DML::%s: StutterExitWatermark = %f\n", __func__, *StutterExitWatermark);
> 
> base-commit: dacd2d2d9d800b7ab2ee2734578112532cba8105



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