linux-kernel - [PATCH AUTOSEL 5.4 08/10] drm/amd/display: Fix for the no Audio bug with Tiled Displays

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Message-Id: <20211206211738.1661003-8-sashal@kernel.org>
Date:   Mon,  6 Dec 2021 16:17:27 -0500
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Mustapha Ghaddar <mghaddar@....com>, Jun Lei <Jun.Lei@....com>,
        Bhawanpreet Lakha <Bhawanpreet.Lakha@....com>,
        Mustapha Ghaddar <mustapha.ghaddar@....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@...ux.ie,
        daniel@...ll.ch, aric.cyr@....com, mario.kleiner.de@...il.com,
        Jimmy.Kizito@....com, liviu@...au.co.uk, lee.jones@...aro.org,
        Dmytro.Laktyushkin@....com, Jerry.Zuo@....com,
        vladimir.stempen@....com, amd-gfx@...ts.freedesktop.org,
        dri-devel@...ts.freedesktop.org
Subject: [PATCH AUTOSEL 5.4 08/10] drm/amd/display: Fix for the no Audio bug with Tiled Displays

From: Mustapha Ghaddar <mghaddar@....com>

[ Upstream commit 5ceaebcda9061c04f439c93961f0819878365c0f ]

[WHY]
It seems like after a series of plug/unplugs we end up in a situation
where tiled display doesnt support Audio.

[HOW]
The issue seems to be related to when we check streams changed after an
HPD, we should be checking the audio_struct as well to see if any of its
values changed.

Reviewed-by: Jun Lei <Jun.Lei@....com>
Acked-by: Bhawanpreet Lakha <Bhawanpreet.Lakha@....com>
Signed-off-by: Mustapha Ghaddar <mustapha.ghaddar@....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/core/dc_resource.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/gpu/drm/amd/display/dc/core/dc_resource.c b/drivers/gpu/drm/amd/display/dc/core/dc_resource.c
index f25ac17f47fa9..95a5310e9e661 100644
--- a/drivers/gpu/drm/amd/display/dc/core/dc_resource.c
+++ b/drivers/gpu/drm/amd/display/dc/core/dc_resource.c
@@ -1546,6 +1546,10 @@ bool dc_is_stream_unchanged(
 	if (old_stream->ignore_msa_timing_param != stream->ignore_msa_timing_param)
 		return false;
 
+	// Only Have Audio left to check whether it is same or not. This is a corner case for Tiled sinks
+	if (old_stream->audio_info.mode_count != stream->audio_info.mode_count)
+		return false;
+
 	return true;
 }
 
-- 
2.33.0