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Date:   Tue, 22 Dec 2020 21:13:10 -0500
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Lewis Huang <Lewis.Huang@....com>, Tony Cheng <Tony.Cheng@....com>,
        Qingqing Zhuo <qingqing.zhuo@....com>,
        Alex Deucher <alexander.deucher@....com>,
        Sasha Levin <sashal@...nel.org>, amd-gfx@...ts.freedesktop.org,
        dri-devel@...ts.freedesktop.org
Subject: [PATCH AUTOSEL 5.10 021/217] drm/amd/display: stop top_mgr when type change to non-MST during s3

From: Lewis Huang <Lewis.Huang@....com>

[ Upstream commit e748b59fb74e8725c8774a4b0753fabba9de7b97 ]

[Why]
Driver keeps the invalid information cause report the
incorrect monitor which save in remote sink to OS

[How]
When connector type change from MST to non-MST,
stop the topology manager.

Signed-off-by: Lewis Huang <Lewis.Huang@....com>
Reviewed-by: Tony Cheng <Tony.Cheng@....com>
Acked-by: Qingqing Zhuo <qingqing.zhuo@....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_link.c | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/drivers/gpu/drm/amd/display/dc/core/dc_link.c b/drivers/gpu/drm/amd/display/dc/core/dc_link.c
index 5b0cedfa824a9..59c5915665112 100644
--- a/drivers/gpu/drm/amd/display/dc/core/dc_link.c
+++ b/drivers/gpu/drm/amd/display/dc/core/dc_link.c
@@ -854,6 +854,7 @@ static bool dc_link_detect_helper(struct dc_link *link,
 	struct dpcd_caps prev_dpcd_caps;
 	bool same_dpcd = true;
 	enum dc_connection_type new_connection_type = dc_connection_none;
+	enum dc_connection_type pre_connection_type = dc_connection_none;
 	bool perform_dp_seamless_boot = false;
 	const uint32_t post_oui_delay = 30; // 30ms
 
@@ -889,6 +890,7 @@ static bool dc_link_detect_helper(struct dc_link *link,
 
 	link_disconnect_sink(link);
 	if (new_connection_type != dc_connection_none) {
+		pre_connection_type = link->type;
 		link->type = new_connection_type;
 		link->link_state_valid = false;
 
@@ -962,6 +964,12 @@ static bool dc_link_detect_helper(struct dc_link *link,
 				return true;
 			}
 
+			// link switch from MST to non-MST stop topology manager
+			if (pre_connection_type == dc_connection_mst_branch &&
+				link->type != dc_connection_mst_branch) {
+				dm_helpers_dp_mst_stop_top_mgr(link->ctx, link);
+			}
+
 			if (link->type == dc_connection_mst_branch) {
 				LINK_INFO("link=%d, mst branch is now Connected\n",
 					  link->link_index);
-- 
2.27.0

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