From 7c37d399c2b84d4b79de4d512a38373f1d71ab90 Mon Sep 17 00:00:00 2001
From: Jun Lei <Jun.Lei@amd.com>
Date: Thu, 19 Sep 2019 17:43:45 -0400
Subject: drm/amd/display: add 50us buffer as WA for pstate switch in active
Git-commit: 7c37d399c2b84d4b79de4d512a38373f1d71ab90
Patch-mainline: v5.4-rc6
References: bsc#1152472
Signed-off-by: Jun Lei <Jun.Lei@amd.com>
Reviewed-by: Aric Cyr <Aric.Cyr@amd.com>
Acked-by: Leo Li <sunpeng.li@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Acked-by: Thomas Zimmermann <tzimmermann@suse.de>
---
drivers/gpu/drm/amd/display/dc/dml/dcn20/display_mode_vba_20.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/drivers/gpu/drm/amd/display/dc/dml/dcn20/display_mode_vba_20.c b/drivers/gpu/drm/amd/display/dc/dml/dcn20/display_mode_vba_20.c
index 649883777f62..6c6c486b774a 100644
--- a/drivers/gpu/drm/amd/display/dc/dml/dcn20/display_mode_vba_20.c
+++ b/drivers/gpu/drm/amd/display/dc/dml/dcn20/display_mode_vba_20.c
@@ -2577,7 +2577,8 @@ static void dml20_DISPCLKDPPCLKDCFCLKDeepSleepPrefetchParametersWatermarksAndPer
mode_lib->vba.MinActiveDRAMClockChangeMargin
+ mode_lib->vba.DRAMClockChangeLatency;
- if (mode_lib->vba.MinActiveDRAMClockChangeMargin > 0) {
+ if (mode_lib->vba.MinActiveDRAMClockChangeMargin > 50) {
+ mode_lib->vba.DRAMClockChangeWatermark += 25;
mode_lib->vba.DRAMClockChangeSupport[0][0] = dm_dram_clock_change_vactive;
} else {
if (mode_lib->vba.SynchronizedVBlank || mode_lib->vba.NumberOfActivePlanes == 1) {
--
2.28.0