From: Lewis Huang <Lewis.Huang@amd.com>
Date: Thu, 8 Oct 2020 06:09:45 +0000 (+0800)
Subject: drm/amd/display: stop top_mgr when type change to non-MST during s3
X-Git-Tag: baikal/mips/sdk5.9~12066^2~12^2~60
X-Git-Url: https://git.baikalelectronics.ru/sdk/?a=commitdiff_plain;h=084b0cb3fd0ef2cb8c2a5629b34ee42421ebd45c;p=kernel.git

drm/amd/display: stop top_mgr when type change to non-MST during s3

[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@amd.com>
Reviewed-by: Tony Cheng <Tony.Cheng@amd.com>
Acked-by: Qingqing Zhuo <qingqing.zhuo@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
---

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 204460cbc7f94..3900c81699a06 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);