[PATCH 5/9] drm/amd/display: Use matrix of double 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=]

Remove TotalMaxPrefetchFlipDPTERowBandwidth from UseMinimumDCFCLK
(DCN314), and use TotalMaxPrefetchFlipDPTERowBandwidth from struct.

Cc: Alex Deucher <alexdeuc...@gmail.com>
Cc: Aurabindo Pillai <aurabindo.pil...@amd.com>
Cc: Hamza Mahfooz <hamza.mahf...@amd.com>
Cc: Roman Li <roman...@amd.com>
Cc: Geert Uytterhoeven <ge...@linux-m68k.org>
Link: https://lore.kernel.org/all/20221227082932.798359-1-ge...@linux-m68k.org/
Reported-by: Geert Uytterhoeven <ge...@linux-m68k.org>
Signed-off-by: Rodrigo Siqueira <rodrigo.sique...@amd.com>
---
 .../drm/amd/display/dc/dml/dcn314/display_mode_vba_314.c   | 7 +++----
 1 file changed, 3 insertions(+), 4 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 950669f2c10d..2ea89a26c6e8 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
@@ -6972,7 +6972,6 @@ static void UseMinimumDCFCLK(
        struct vba_vars_st *v = &mode_lib->vba;
        int dummy1, i, j, k;
        double NormalEfficiency,  dummy2, dummy3;
-       double TotalMaxPrefetchFlipDPTERowBandwidth[DC__VOLTAGE_STATES][2];
 
        NormalEfficiency = 
v->PercentOfIdealFabricAndSDPPortBWReceivedAfterUrgLatency / 100.0;
        for (i = 0; i < v->soc.num_states; ++i) {
@@ -6991,9 +6990,9 @@ static void UseMinimumDCFCLK(
                        int NoOfDPPState[DC__NUM_DPP__MAX];
                        double MinimumTvmPlus2Tr0;
 
-                       TotalMaxPrefetchFlipDPTERowBandwidth[i][j] = 0;
+                       
v->UseMinimumDCFCLK_stack_reduction.TotalMaxPrefetchFlipDPTERowBandwidth[i][j] 
= 0;
                        for (k = 0; k < v->NumberOfActivePlanes; ++k) {
-                               TotalMaxPrefetchFlipDPTERowBandwidth[i][j] = 
TotalMaxPrefetchFlipDPTERowBandwidth[i][j]
+                               
v->UseMinimumDCFCLK_stack_reduction.TotalMaxPrefetchFlipDPTERowBandwidth[i][j] 
= v->UseMinimumDCFCLK_stack_reduction.TotalMaxPrefetchFlipDPTERowBandwidth[i][j]
                                                + v->NoOfDPP[i][j][k] * 
v->DPTEBytesPerRow[i][j][k] / (15.75 * v->HTotal[k] / v->PixelClock[k]);
                        }
 
@@ -7003,7 +7002,7 @@ static void UseMinimumDCFCLK(
                        MinimumTWait = CalculateTWait(MaxPrefetchMode, 
v->FinalDRAMClockChangeLatency, v->UrgLatency[i], v->SREnterPlusExitTime);
                        NonDPTEBandwidth = v->TotalVActivePixelBandwidth[i][j] 
+ v->TotalVActiveCursorBandwidth[i][j] + v->TotalMetaRowBandwidth[i][j];
                        DPTEBandwidth = (v->HostVMEnable == true || 
v->ImmediateFlipRequirement[0] == dm_immediate_flip_required) ?
-                                       
TotalMaxPrefetchFlipDPTERowBandwidth[i][j] : v->TotalDPTERowBandwidth[i][j];
+                                       
v->UseMinimumDCFCLK_stack_reduction.TotalMaxPrefetchFlipDPTERowBandwidth[i][j] 
: v->TotalDPTERowBandwidth[i][j];
                        DCFCLKRequiredForAverageBandwidth = dml_max3(
                                        v->ProjectedDCFCLKDeepSleep[i][j],
                                        (NonDPTEBandwidth + 
v->TotalDPTERowBandwidth[i][j]) / v->ReturnBusWidth
-- 
2.39.0