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drm/amd/display: Fix underflow issue on 175hz timing

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[ Upstream commit 735688eb905db529efea0c78466fccc1461c3fde ]

[Why]
Screen underflows happen on 175hz timing for 3 plane overlay case.

[How]
Based on dst y prefetch value clamp to equ or oto for bandwidth
calculation.

Reviewed-by: Dillon Varone <dillon.varone@amd.com>
Acked-by: Alex Hung <alex.hung@amd.com>
Signed-off-by: Leo Ma <hanghong.ma@amd.com>
Tested-by: Daniel Wheeler <daniel.wheeler@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Leo Ma 2023-07-06 16:17:03 -04:00 committed by Greg Kroah-Hartman
parent 4630c27c55
commit 2ec715bf88
1 changed files with 6 additions and 1 deletions
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7
drivers/gpu/drm/amd/display/dc/dml/dcn32/display_mode_vba_util_32.c
View File

@ -3454,6 +3454,7 @@ bool dml32_CalculatePrefetchSchedule(
double TimeForFetchingMetaPTE = 0;
double TimeForFetchingRowInVBlank = 0;
double LinesToRequestPrefetchPixelData = 0;
double LinesForPrefetchBandwidth = 0;
unsigned int HostVMDynamicLevelsTrips;
double trip_to_mem;
double Tvm_trips;
@ -3883,11 +3884,15 @@ bool dml32_CalculatePrefetchSchedule(
TimeForFetchingMetaPTE = Tvm_oto;
TimeForFetchingRowInVBlank = Tr0_oto;
*PrefetchBandwidth = prefetch_bw_oto;
/* Clamp to oto for bandwidth calculation */
LinesForPrefetchBandwidth = dst_y_prefetch_oto;
} else {
*DestinationLinesForPrefetch = dst_y_prefetch_equ;
TimeForFetchingMetaPTE = Tvm_equ;
TimeForFetchingRowInVBlank = Tr0_equ;
*PrefetchBandwidth = prefetch_bw_equ;
/* Clamp to equ for bandwidth calculation */
LinesForPrefetchBandwidth = dst_y_prefetch_equ;
}
*DestinationLinesToRequestVMInVBlank = dml_ceil(4.0 * TimeForFetchingMetaPTE / LineTime, 1.0) / 4.0;
@ -3895,7 +3900,7 @@ bool dml32_CalculatePrefetchSchedule(
*DestinationLinesToRequestRowInVBlank =
dml_ceil(4.0 * TimeForFetchingRowInVBlank / LineTime, 1.0) / 4.0;
LinesToRequestPrefetchPixelData = *DestinationLinesForPrefetch -
LinesToRequestPrefetchPixelData = LinesForPrefetchBandwidth -
*DestinationLinesToRequestVMInVBlank - 2 * *DestinationLinesToRequestRowInVBlank;
#ifdef __DML_VBA_DEBUG__