linux-kernel - [PATCH AUTOSEL 6.1 16/22] drm/amd/display: Blocking invalid 420 modes on HDMI TMDS for DCN314

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Message-Id: <20230908193407.3463368-16-sashal@kernel.org>
Date:   Fri,  8 Sep 2023 15:34:00 -0400
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Leo Chen <sancchen@....com>,
        Nicholas Kazlauskas <nicholas.kazlauskas@....com>,
        Tom Chung <chiahsuan.chung@....com>,
        Daniel Wheeler <daniel.wheeler@....com>,
        Alex Deucher <alexander.deucher@....com>,
        Sasha Levin <sashal@...nel.org>, harry.wentland@....com,
        sunpeng.li@....com, Rodrigo.Siqueira@....com,
        christian.koenig@....com, Xinhui.Pan@....com, airlied@...il.com,
        daniel@...ll.ch, Jun.Lei@....com, nathan@...nel.org,
        Daniel.Miess@....com, Charlene.Liu@....com, Paul.Hsieh@....com,
        jerry.zuo@....com, amd-gfx@...ts.freedesktop.org,
        dri-devel@...ts.freedesktop.org
Subject: [PATCH AUTOSEL 6.1 16/22] drm/amd/display: Blocking invalid 420 modes on HDMI TMDS for DCN314

From: Leo Chen <sancchen@....com>

[ Upstream commit 4c6107a653ccf361cb1b6ba35d558a1a5e6e57ac ]

[Why & How]
HDMI TMDS does not have ODM support. Filtering 420 modes that
exceed the 4096 FMT limitation on DCN314 will resolve
intermittent corruptions issues.

Reviewed-by: Nicholas Kazlauskas <nicholas.kazlauskas@....com>
Acked-by: Tom Chung <chiahsuan.chung@....com>
Signed-off-by: Leo Chen <sancchen@....com>
Tested-by: Daniel Wheeler <daniel.wheeler@....com>
Signed-off-by: Alex Deucher <alexander.deucher@....com>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 .../gpu/drm/amd/display/dc/dml/dcn314/display_mode_vba_314.c  | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/amd/display/dc/dml/dcn314/display_mode_vba_314.c b/drivers/gpu/drm/amd/display/dc/dml/dcn314/display_mode_vba_314.c
index 4998b211ccac7..5b47ccde64241 100644
--- a/drivers/gpu/drm/amd/display/dc/dml/dcn314/display_mode_vba_314.c
+++ b/drivers/gpu/drm/amd/display/dc/dml/dcn314/display_mode_vba_314.c
@@ -4225,7 +4225,9 @@ void dml314_ModeSupportAndSystemConfigurationFull(struct display_mode_lib *mode_
 				}
 				if (v->OutputFormat[k] == dm_420 && v->HActive[k] > DCN314_MAX_FMT_420_BUFFER_WIDTH
 						&& v->ODMCombineEnablePerState[i][k] != dm_odm_combine_mode_4to1) {
-					if (v->HActive[k] / 2 > DCN314_MAX_FMT_420_BUFFER_WIDTH) {
+					if (v->Output[k] == dm_hdmi) {
+						FMTBufferExceeded = true;
+					} else if (v->HActive[k] / 2 > DCN314_MAX_FMT_420_BUFFER_WIDTH) {
 						v->ODMCombineEnablePerState[i][k] = dm_odm_combine_mode_4to1;
 						v->PlaneRequiredDISPCLK = v->PlaneRequiredDISPCLKWithODMCombine4To1;
 
-- 
2.40.1