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drm/amd/display: Set max for prefetch lines on dcn32 

[WHY?]
Max number of lines that can be used for prefetch due to type constraints is
63.75.

[HOW?]
Enforce maximum prefetch lines as 63.75.

Reviewed-by: Jun Lei <Jun.Lei@amd.com>
Acked-by: Tom Chung <chiahsuan.chung@amd.com>
Signed-off-by: Dillon Varone <Dillon.Varone@amd.com>
Tested-by: Daniel Wheeler <daniel.wheeler@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Dillon Varone 2022-11-03 18:40:01 -04:00 committed by Alex Deucher
parent c149947b18
commit f8d7edb0cd
2 changed files with 5 additions and 4 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
drivers/gpu/drm/amd/display/dc/dml/dcn32/display_mode_vba_32.h
View File

@ -46,6 +46,8 @@
// Prefetch schedule max vratio
#define __DML_MAX_VRATIO_PRE__ 4.0
#define __DML_VBA_MAX_DST_Y_PRE__ 63.75
#define BPP_INVALID 0
#define BPP_BLENDED_PIPE 0xffffffff

7
drivers/gpu/drm/amd/display/dc/dml/dcn32/display_mode_vba_util_32.c
View File

@ -3475,7 +3475,6 @@ bool dml32_CalculatePrefetchSchedule(
double min_Lsw;
double Tsw_est1 = 0;
double Tsw_est3 = 0;
double TPreMargin = 0;
if (v->GPUVMEnable == true && v->HostVMEnable == true)
HostVMDynamicLevelsTrips = v->HostVMMaxNonCachedPageTableLevels;
@ -3669,6 +3668,7 @@ bool dml32_CalculatePrefetchSchedule(
dst_y_prefetch_equ = VStartup - (*TSetup + dml_max(TWait + TCalc, *Tdmdl)) / LineTime -
(*DSTYAfterScaler + (double) *DSTXAfterScaler / (double) myPipe->HTotal);
dst_y_prefetch_equ = dml_min(dst_y_prefetch_equ, __DML_VBA_MAX_DST_Y_PRE__);
#ifdef __DML_VBA_DEBUG__
dml_print("DML::%s: HTotal = %d\n", __func__, myPipe->HTotal);
dml_print("DML::%s: min_Lsw = %f\n", __func__, min_Lsw);
@ -3701,8 +3701,6 @@ bool dml32_CalculatePrefetchSchedule(
dst_y_prefetch_equ = dml_floor(4.0 * (dst_y_prefetch_equ + 0.125), 1) / 4.0;
Tpre_rounded = dst_y_prefetch_equ * LineTime;
TPreMargin = Tpre_rounded - TPreReq;
#ifdef __DML_VBA_DEBUG__
dml_print("DML::%s: dst_y_prefetch_equ: %f (after round)\n", __func__, dst_y_prefetch_equ);
dml_print("DML::%s: LineTime: %f\n", __func__, LineTime);
@ -3730,7 +3728,8 @@ bool dml32_CalculatePrefetchSchedule(
*VRatioPrefetchY = 0;
*VRatioPrefetchC = 0;
*RequiredPrefetchPixDataBWLuma = 0;
if (dst_y_prefetch_equ > 1 && TPreMargin > 0.0) {
if (dst_y_prefetch_equ > 1 &&
(Tpre_rounded >= TPreReq || dst_y_prefetch_equ == __DML_VBA_MAX_DST_Y_PRE__)) {
double PrefetchBandwidth1;
double PrefetchBandwidth2;
double PrefetchBandwidth3;