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Message-Id: <20210715182605.838670801@linuxfoundation.org>
Date:   Thu, 15 Jul 2021 20:37:15 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Wesley Chalmers <Wesley.Chalmers@....com>,
        Dmytro Laktyushkin <Dmytro.Laktyushkin@....com>,
        Stylon Wang <stylon.wang@....com>,
        Daniel Wheeler <daniel.wheeler@....com>,
        Alex Deucher <alexander.deucher@....com>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 5.12 073/242] drm/amd/display: Set DISPCLK_MAX_ERRDET_CYCLES to 7

From: Wesley Chalmers <Wesley.Chalmers@....com>

[ Upstream commit 3577e1678772ce3ede92af3a75b44a4b76f9b4ad ]

[WHY]
DISPCLK_MAX_ERRDET_CYCLES must be 7 to prevent connection loss when
changing DENTIST_DISPCLK_WDIVIDER from 126 to 127 and back.

Signed-off-by: Wesley Chalmers <Wesley.Chalmers@....com>
Reviewed-by: Dmytro Laktyushkin <Dmytro.Laktyushkin@....com>
Acked-by: Stylon Wang <stylon.wang@....com>
Tested-by: Daniel Wheeler <daniel.wheeler@....com>
Signed-off-by: Alex Deucher <alexander.deucher@....com>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/gpu/drm/amd/display/dc/dcn20/dcn20_hwseq.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/amd/display/dc/dcn20/dcn20_hwseq.c b/drivers/gpu/drm/amd/display/dc/dcn20/dcn20_hwseq.c
index aece1103331d..d8a03d825623 100644
--- a/drivers/gpu/drm/amd/display/dc/dcn20/dcn20_hwseq.c
+++ b/drivers/gpu/drm/amd/display/dc/dcn20/dcn20_hwseq.c
@@ -243,7 +243,7 @@ void dcn20_dccg_init(struct dce_hwseq *hws)
 	REG_WRITE(MILLISECOND_TIME_BASE_DIV, 0x1186a0);
 
 	/* This value is dependent on the hardware pipeline delay so set once per SOC */
-	REG_WRITE(DISPCLK_FREQ_CHANGE_CNTL, 0x801003c);
+	REG_WRITE(DISPCLK_FREQ_CHANGE_CNTL, 0xe01003c);
 }
 
 void dcn20_disable_vga(
-- 
2.30.2



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