linux-kernel - [PATCH AUTOSEL 5.12 078/160] drm/amd/display: Set DISPCLK_MAX_ERRDET

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Date:   Tue,  6 Jul 2021 07:17:04 -0400
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     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>, amd-gfx@...ts.freedesktop.org,
        dri-devel@...ts.freedesktop.org
Subject: [PATCH AUTOSEL 5.12 078/160] 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