linux-kernel - [PATCH 4.19 12/67] drm/amd/display: Fix 6x4K displays light-up on Vega20 (v2)

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Date:   Thu, 20 Dec 2018 10:18:24 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Hersen Wu <hersenxs.wu@....com>,
        Feifei Xu <Feifei.Xu@....com>, Evan Quan <evan.quan@....com>,
        Alex Deucher <alexander.deucher@....com>,
        Roman Li <Roman.Li@....com>, Sasha Levin <sashal@...nel.org>
Subject: [PATCH 4.19 12/67] drm/amd/display: Fix 6x4K displays light-up on Vega20 (v2)

4.19-stable review patch.  If anyone has any objections, please let me know.

------------------

[ Upstream commit c6888879fd55b1ba903c2a770127edbf6aef6f27 ]

[Why]
More than 4x4K didn't lightup on Vega20 due to low dcfclk value.
Powerplay expects valid min requirement for dcfclk from DC.

[How]
Update min_dcfclock_khz based on min_engine_clock value.

v2: backport to 4.20 (Alex)

Reviewed-by: Hersen Wu <hersenxs.wu@....com>
Reviewed-by: Feifei Xu <Feifei.Xu@....com>
Reviewed-by: Evan Quan <evan.quan@....com>
Acked-by: Alex Deucher <alexander.deucher@....com>
Signed-off-by: Roman Li <Roman.Li@....com>
Signed-off-by: Alex Deucher <alexander.deucher@....com>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/gpu/drm/amd/display/dc/dce110/dce110_hw_sequencer.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/gpu/drm/amd/display/dc/dce110/dce110_hw_sequencer.c b/drivers/gpu/drm/amd/display/dc/dce110/dce110_hw_sequencer.c
index b2f308766a9e..0941f3c689bc 100644
--- a/drivers/gpu/drm/amd/display/dc/dce110/dce110_hw_sequencer.c
+++ b/drivers/gpu/drm/amd/display/dc/dce110/dce110_hw_sequencer.c
@@ -2530,6 +2530,8 @@ static void pplib_apply_display_requirements(
 			dc,
 			context->bw.dce.sclk_khz);
 
+	pp_display_cfg->min_dcfclock_khz = pp_display_cfg->min_engine_clock_khz;
+
 	pp_display_cfg->min_engine_clock_deep_sleep_khz
 			= context->bw.dce.sclk_deep_sleep_khz;
 
-- 
2.19.1