[PATCH 7/9] drm/amd/display: Use PrefetchPixelLinesTime from struct instead of local variable

[Rodrigo Siqueira]

It was reported that on kernel v6.2-rc1, we have the following stack
size issue:

[...]/display/dc/dml/dcn314/display_mode_vba_314.c: In function
'UseMinimumDCFCLK':
[...]/display/dc/dml/dcn314/display_mode_vba_314.c:7127:1: error: the
frame size of 2208 bytes is larger than 2048 bytes
[-Werror=frame-larger-than=]

This commit replaces the local PrefetchPixelLinesTime from the same
version in the UseMinimumDCFCLK_vars struct.

Cc: Alex Deucher <alexdeucher at gmail.com>
Cc: Aurabindo Pillai <aurabindo.pillai at amd.com>
Cc: Hamza Mahfooz <hamza.mahfooz at amd.com>
Cc: Roman Li <roman.li at amd.com>
Cc: Geert Uytterhoeven <geert at linux-m68k.org>
Link: https://lore.kernel.org/all/20221227082932.798359-1-geert@linux-m68k.org/
Reported-by: Geert Uytterhoeven <geert at linux-m68k.org>
Signed-off-by: Rodrigo Siqueira <Rodrigo.Siqueira at amd.com>
---
 .../amd/display/dc/dml/dcn314/display_mode_vba_314.c  | 11 +++++------
 1 file changed, 5 insertions(+), 6 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 8de1f7840b5a..f51885d3dd2d 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
@@ -6976,7 +6976,6 @@ static void UseMinimumDCFCLK(
 	NormalEfficiency = v->PercentOfIdealFabricAndSDPPortBWReceivedAfterUrgLatency / 100.0;
 	for (i = 0; i < v->soc.num_states; ++i) {
 		for (j = 0; j <= 1; ++j) {
-			double PrefetchPixelLinesTime[DC__NUM_DPP__MAX];
 			double DCFCLKRequiredForPeakBandwidthPerPlane[DC__NUM_DPP__MAX];
 			double DynamicMetadataVMExtraLatency[DC__NUM_DPP__MAX];
 			double MinimumTWait;
@@ -7034,7 +7033,7 @@ static void UseMinimumDCFCLK(
 						+ v->PDEAndMetaPTEBytesPerFrame[i][j][k] / NormalEfficiency / NormalEfficiency / v->ReturnBusWidth * (v->GPUVMMaxPageTableLevels > 2 ? 1 : 0)
 						+ 2 * v->DPTEBytesPerRow[i][j][k] / NormalEfficiency / NormalEfficiency / v->ReturnBusWidth
 						+ 2 * v->MetaRowBytes[i][j][k] / NormalEfficiency / v->ReturnBusWidth + v->UseMinimumDCFCLK_stack_reduction.PixelDCFCLKCyclesRequiredInPrefetch[k];
-				PrefetchPixelLinesTime[k] = dml_max(v->PrefetchLinesY[i][j][k], v->PrefetchLinesC[i][j][k]) * v->HTotal[k] / v->PixelClock[k];
+				v->UseMinimumDCFCLK_stack_reduction.PrefetchPixelLinesTime[k] = dml_max(v->PrefetchLinesY[i][j][k], v->PrefetchLinesC[i][j][k]) * v->HTotal[k] / v->PixelClock[k];
 				ExpectedPrefetchBWAcceleration = (v->VActivePixelBandwidth[i][j][k] + v->VActiveCursorBandwidth[i][j][k])
 						/ (v->ReadBandwidthLuma[k] + v->ReadBandwidthChroma[k]);
 				DynamicMetadataVMExtraLatency[k] =
@@ -7049,9 +7048,9 @@ static void UseMinimumDCFCLK(
 				if (PrefetchTime > 0) {
 					double ExpectedVRatioPrefetch;
 
-					ExpectedVRatioPrefetch = PrefetchPixelLinesTime[k]
+					ExpectedVRatioPrefetch = v->UseMinimumDCFCLK_stack_reduction.PrefetchPixelLinesTime[k]
 							/ (PrefetchTime * v->UseMinimumDCFCLK_stack_reduction.PixelDCFCLKCyclesRequiredInPrefetch[k] / DCFCLKCyclesRequiredInPrefetch);
-					DCFCLKRequiredForPeakBandwidthPerPlane[k] = NoOfDPPState[k] * v->UseMinimumDCFCLK_stack_reduction.PixelDCFCLKCyclesRequiredInPrefetch[k] / PrefetchPixelLinesTime[k]
+					DCFCLKRequiredForPeakBandwidthPerPlane[k] = NoOfDPPState[k] * v->UseMinimumDCFCLK_stack_reduction.PixelDCFCLKCyclesRequiredInPrefetch[k] / v->UseMinimumDCFCLK_stack_reduction.PrefetchPixelLinesTime[k]
 							* dml_max(1.0, ExpectedVRatioPrefetch) * dml_max(1.0, ExpectedVRatioPrefetch / 4) * ExpectedPrefetchBWAcceleration;
 					if (v->HostVMEnable == true || v->ImmediateFlipRequirement[0] == dm_immediate_flip_required) {
 						DCFCLKRequiredForPeakBandwidthPerPlane[k] = DCFCLKRequiredForPeakBandwidthPerPlane[k]
@@ -7110,12 +7109,12 @@ static void UseMinimumDCFCLK(
 				double MaximumTvmPlus2Tr0PlusTsw;
 
 				MaximumTvmPlus2Tr0PlusTsw = (v->MaximumVStartup[i][j][k] - 2) * v->HTotal[k] / v->PixelClock[k] - MinimumTWait - DynamicMetadataVMExtraLatency[k];
-				if (MaximumTvmPlus2Tr0PlusTsw <= MinimumTvmPlus2Tr0 + PrefetchPixelLinesTime[k] / 4) {
+				if (MaximumTvmPlus2Tr0PlusTsw <= MinimumTvmPlus2Tr0 + v->UseMinimumDCFCLK_stack_reduction.PrefetchPixelLinesTime[k] / 4) {
 					DCFCLKRequiredForPeakBandwidth = v->DCFCLKPerState[i];
 				} else {
 					DCFCLKRequiredForPeakBandwidth = dml_max3(
 							DCFCLKRequiredForPeakBandwidth,
-							2 * ExtraLatencyCycles / (MaximumTvmPlus2Tr0PlusTsw - MinimumTvmPlus2Tr0 - PrefetchPixelLinesTime[k] / 4),
+							2 * ExtraLatencyCycles / (MaximumTvmPlus2Tr0PlusTsw - MinimumTvmPlus2Tr0 - v->UseMinimumDCFCLK_stack_reduction.PrefetchPixelLinesTime[k] / 4),
 							(2 * ExtraLatencyCycles + v->UseMinimumDCFCLK_stack_reduction.PixelDCFCLKCyclesRequiredInPrefetch[k]) / (MaximumTvmPlus2Tr0PlusTsw - MinimumTvmPlus2Tr0));
 				}
 			}
-- 
2.39.0