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Message-Id: <20210317005536.724046-44-sashal@kernel.org>
Date: Tue, 16 Mar 2021 20:55:18 -0400
From: Sasha Levin <sashal@...nel.org>
To: linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc: Sung Lee <sung.lee@....com>,
Daniel Wheeler <daniel.wheeler@....com>,
Haonan Wang <Haonan.Wang2@....com>,
Eryk Brol <eryk.brol@....com>,
Alex Deucher <alexander.deucher@....com>,
Sasha Levin <sashal@...nel.org>, amd-gfx@...ts.freedesktop.org,
dri-devel@...ts.freedesktop.org
Subject: [PATCH AUTOSEL 5.11 44/61] drm/amd/display: Revert dram_clock_change_latency for DCN2.1
From: Sung Lee <sung.lee@....com>
[ Upstream commit b0075d114c33580f5c9fa9cee8e13d06db41471b ]
[WHY & HOW]
Using values provided by DF for latency may cause hangs in
multi display configurations. Revert change to previous value.
Tested-by: Daniel Wheeler <daniel.wheeler@....com>
Signed-off-by: Sung Lee <sung.lee@....com>
Reviewed-by: Haonan Wang <Haonan.Wang2@....com>
Acked-by: Eryk Brol <eryk.brol@....com>
Signed-off-by: Alex Deucher <alexander.deucher@....com>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
drivers/gpu/drm/amd/display/dc/dcn21/dcn21_resource.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/gpu/drm/amd/display/dc/dcn21/dcn21_resource.c b/drivers/gpu/drm/amd/display/dc/dcn21/dcn21_resource.c
index 072f8c880924..2d2541cab705 100644
--- a/drivers/gpu/drm/amd/display/dc/dcn21/dcn21_resource.c
+++ b/drivers/gpu/drm/amd/display/dc/dcn21/dcn21_resource.c
@@ -296,7 +296,7 @@ struct _vcs_dpi_soc_bounding_box_st dcn2_1_soc = {
.num_banks = 8,
.num_chans = 4,
.vmm_page_size_bytes = 4096,
- .dram_clock_change_latency_us = 11.72,
+ .dram_clock_change_latency_us = 23.84,
.return_bus_width_bytes = 64,
.dispclk_dppclk_vco_speed_mhz = 3600,
.xfc_bus_transport_time_us = 4,
--
2.30.1
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