From 123e431f842a717fb7387608ac2314017071350b Mon Sep 17 00:00:00 2001
From: Bing Guo <Bing.Guo@amd.com>
Date: Thu, 20 Jan 2022 18:34:24 -0500
Subject: drm/amdgpu/display/dc: do blocked MST topology discovery at resume
from S3/S4
Git-commit: b65007590911ad558999073dbffa413cf4861df3
Patch-mainline: v5.18-rc1
References: jsc#PED-1166 jsc#PED-1168 jsc#PED-1170 jsc#PED-1218 jsc#PED-1220 jsc#PED-1222 jsc#PED-1223 jsc#PED-1225
Why:
When resume from sleep or hiberation, blocked MST Topology discovery might
need to be used.
How:
Added "DETECT_REASON_RESUMEFROMS3S4" to enum dc_detect_reason; use it to
require blocked MST Topology discovery.
Reviewed-by: Wenjing Liu <Wenjing.Liu@amd.com>
Acked-by: Jasdeep Dhillon <jdhillon@amd.com>
Signed-off-by: Bing Guo <Bing.Guo@amd.com>
Tested-by: Daniel Wheeler <daniel.wheeler@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Acked-by: Patrik Jakobsson <pjakobsson@suse.de>
---
drivers/gpu/drm/amd/display/dc/core/dc_link.c | 2 +-
drivers/gpu/drm/amd/display/dc/dc_link.h | 1 +
2 files changed, 2 insertions(+), 1 deletion(-)
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 cb6c91cd6e83..ec4b300ec067 100644
--- a/drivers/gpu/drm/amd/display/dc/core/dc_link.c
+++ b/drivers/gpu/drm/amd/display/dc/core/dc_link.c
@@ -831,7 +831,7 @@ static bool discover_dp_mst_topology(struct dc_link *link, enum dc_detect_reason
link->type = dc_connection_mst_branch;
dm_helpers_dp_update_branch_info(link->ctx, link);
if (dm_helpers_dp_mst_start_top_mgr(link->ctx,
- link, reason == DETECT_REASON_BOOT)) {
+ link, (reason == DETECT_REASON_BOOT || reason == DETECT_REASON_RESUMEFROMS3S4))) {
link_disconnect_sink(link);
} else {
link->type = dc_connection_sst_branch;
diff --git a/drivers/gpu/drm/amd/display/dc/dc_link.h b/drivers/gpu/drm/amd/display/dc/dc_link.h
index e7ead9e25318..9ad3ee4079c3 100644
--- a/drivers/gpu/drm/amd/display/dc/dc_link.h
+++ b/drivers/gpu/drm/amd/display/dc/dc_link.h
@@ -312,6 +312,7 @@ void dc_link_blank_dp_stream(struct dc_link *link, bool hw_init);
*/
enum dc_detect_reason {
DETECT_REASON_BOOT,
+ DETECT_REASON_RESUMEFROMS3S4,
DETECT_REASON_HPD,
DETECT_REASON_HPDRX,
DETECT_REASON_FALLBACK,
--
2.38.1