From 7ca7e3cb0cae1e04f243700b8415df545354cd96 Mon Sep 17 00:00:00 2001
From: Leo Ma <hanghong.ma@amd.com>
Date: Thu, 6 Jul 2023 16:17:03 -0400
Subject: drm/amd/display: Fix underflow issue on 175hz timing
Git-commit: 735688eb905db529efea0c78466fccc1461c3fde
Patch-mainline: v6.6-rc1
References: jsc#PED-3527 jsc#PED-5475 jsc#PED-6068 jsc#PED-6070 jsc#PED-6116 jsc#PED-6120 jsc#PED-5065 jsc#PED-5477 jsc#PED-5511 jsc#PED-6041 jsc#PED-6069 jsc#PED-6071
[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>
Acked-by: Patrik Jakobsson <pjakobsson@suse.de>
---
.../amd/display/dc/dml/dcn32/display_mode_vba_util_32.c | 7 ++++++-
1 file changed, 6 insertions(+), 1 deletion(-)
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 890797ecf0f9..ecea008f19d3 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
@@ -3459,6 +3459,7 @@ 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;
@@ -3888,11 +3889,15 @@ 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;
@@ -3900,7 +3905,7 @@ 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__
--
2.43.0