shinys000114/linux
1
0
Fork 0
mirror of https://github.com/hardkernel/linux.git synced 2026-06-06 10:58:48 +09:00
Code Issues Packages Projects Releases Wiki Activity

drm/amd/display: Fix DP MST sinks removal issue

Browse Source 
[ Upstream commit cbd6c1b17d ]

[Why]
In USB4 DP tunneling, it's possible to have this scenario that
the path becomes unavailable and CM tears down the path a little bit late.
So, in this case, the HPD is high but fails to read any DPCD register.
That causes the link connection type to be set to sst.
And not all sinks are removed behind the MST branch.

[How]
Restore the link connection type if it fails to read DPCD register.

Cc: stable@vger.kernel.org
Cc: Mario Limonciello <mario.limonciello@amd.com>
Reviewed-by: Wenjing Liu <Wenjing.Liu@amd.com>
Acked-by: Qingqing Zhuo <qingqing.zhuo@amd.com>
Signed-off-by: Cruise Hung <Cruise.Hung@amd.com>
Tested-by: Daniel Wheeler <daniel.wheeler@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
(cherry picked from commit cbd6c1b17d)
Modified for stable backport as a lot of the code in this file was moved
in 6.3 to drivers/gpu/drm/amd/display/dc/link/link_detection.c.
Signed-off-by: Mario Limonciello <mario.limonciello@amd.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Cruise Hung
2023-03-22 17:08:41 -05:00
committed by Greg Kroah-Hartman
parent 5564be74a2
commit ee9caccc5e
1 changed files with 9 additions and 0 deletions
Download Patch File Download Diff File Expand all files Collapse all files

9
drivers/gpu/drm/amd/display/dc/core/dc_link.c
View File

@@ -1016,6 +1016,7 @@ static bool detect_link_and_local_sink(struct dc_link *link,
struct dc_sink *prev_sink = NULL;
struct dpcd_caps prev_dpcd_caps;
enum dc_connection_type new_connection_type = dc_connection_none;
enum dc_connection_type pre_connection_type = link->type;
const uint32_t post_oui_delay = 30; // 30ms
DC_LOGGER_INIT(link->ctx->logger);
@@ -1118,6 +1119,8 @@ static bool detect_link_and_local_sink(struct dc_link *link,
}
if (!detect_dp(link, &sink_caps, reason)) {
link->type = pre_connection_type;
if (prev_sink)
dc_sink_release(prev_sink);
return false;
@@ -1349,6 +1352,8 @@ bool dc_link_detect(struct dc_link *link, enum dc_detect_reason reason)
bool is_delegated_to_mst_top_mgr = false;
enum dc_connection_type pre_link_type = link->type;
DC_LOGGER_INIT(link->ctx->logger);
is_local_sink_detect_success = detect_link_and_local_sink(link, reason);
if (is_local_sink_detect_success && link->local_sink)
@@ -1359,6 +1364,10 @@ bool dc_link_detect(struct dc_link *link, enum dc_detect_reason reason)
link->dpcd_caps.is_mst_capable)
is_delegated_to_mst_top_mgr = discover_dp_mst_topology(link, reason);
DC_LOG_DC("%s: link_index=%d is_local_sink_detect_success=%d pre_link_type=%d link_type=%d\n", __func__,
link->link_index, is_local_sink_detect_success, pre_link_type, link->type);
if (is_local_sink_detect_success &&
pre_link_type == dc_connection_mst_branch &&
link->type != dc_connection_mst_branch)