diff options
| author | Leo Ma | 2023-07-06 16:17:03 -0400 |
|---|---|---|
| committer | Greg Kroah-Hartman | 2023-09-23 11:11:04 +0200 |
| commit | 2ec715bf881696b23caa06953c8c9309c2ce5224 (patch) | |
| tree | 2b62697cfec3b68c4a8175542605da36c4ece92e | |
| parent | 4630c27c5529fe66fda23ec1763918745c8bb192 (diff) | |
drm/amd/display: Fix underflow issue on 175hz timing
[ 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>
| -rw-r--r-- | drivers/gpu/drm/amd/display/dc/dml/dcn32/display_mode_vba_util_32.c | 7 |
1 files changed, 6 insertions, 1 deletions
diff --git a/drivers/gpu/drm/amd/display/dc/dml/dcn32/display_mode_vba_util_32.c b/drivers/gpu/drm/amd/display/dc/dml/dcn32/display_mode_vba_util_32.c index b53feeaf5cf1..23e4be2ad63f 100644 --- a/drivers/gpu/drm/amd/display/dc/dml/dcn32/display_mode_vba_util_32.c +++ b/drivers/gpu/drm/amd/display/dc/dml/dcn32/display_mode_vba_util_32.c @@ -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__ |