diff options
| author | Michael Strauss <michael.strauss@amd.com> | 2022-10-20 15:57:36 -0400 |
|---|---|---|
| committer | Alex Deucher <alexander.deucher@amd.com> | 2022-11-09 17:41:41 -0500 |
| commit | ea192af507d99014775a757bbdb5f6e487fc6c7a (patch) | |
| tree | 296acb3a495101042397cac95ccd069c7d2d9216 | |
| parent | 1df6b9b07e334cee60afebcaca69297477655325 (diff) | |
| download | linux-ea192af507d99014775a757bbdb5f6e487fc6c7a.tar.gz linux-ea192af507d99014775a757bbdb5f6e487fc6c7a.tar.bz2 linux-ea192af507d99014775a757bbdb5f6e487fc6c7a.zip | |
drm/amd/display: Only update link settings after successful MST link train
[WHY]
Currently driver reduces verified link caps on DPIA devices if a link is
trained at a link rate below the max rate verified during link detection.
This blocks high bandwidth modes after setting a low bandwidth mode.
[HOW]
Only update link rate after a successful link train if link is MST.
Reviewed-by: Mustapha Ghaddar <Mustapha.Ghaddar@amd.com>
Acked-by: Alan Liu <HaoPing.Liu@amd.com>
Signed-off-by: Michael Strauss <michael.strauss@amd.com>
Tested-by: Daniel Wheeler <daniel.wheeler@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
4 files changed, 22 insertions, 2 deletions
diff --git a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_helpers.c b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_helpers.c index f72c013d3a5b..e47098fa5aac 100644 --- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_helpers.c +++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_helpers.c @@ -971,3 +971,11 @@ void dm_helpers_enable_periodic_detection(struct dc_context *ctx, bool enable) { /* TODO: add periodic detection implementation */ } + +void dm_helpers_dp_mst_update_branch_bandwidth( + struct dc_context *ctx, + struct dc_link *link) +{ + // TODO +} + 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 24ed057414e1..5304e9daf90a 100644 --- a/drivers/gpu/drm/amd/display/dc/core/dc_link.c +++ b/drivers/gpu/drm/amd/display/dc/core/dc_link.c @@ -4663,6 +4663,10 @@ void dc_link_set_preferred_training_settings(struct dc *dc, link->preferred_link_setting.link_rate = LINK_RATE_UNKNOWN; } + if (link->connector_signal == SIGNAL_TYPE_DISPLAY_PORT && + link->type == dc_connection_mst_branch) + dm_helpers_dp_mst_update_branch_bandwidth(dc->ctx, link); + /* Retrain now, or wait until next stream update to apply */ if (skip_immediate_retrain == false) dc_link_set_preferred_link_settings(dc, &link->preferred_link_setting, link); diff --git a/drivers/gpu/drm/amd/display/dc/core/dc_link_dp.c b/drivers/gpu/drm/amd/display/dc/core/dc_link_dp.c index a3e1aeccd3f5..b772d7f2301c 100644 --- a/drivers/gpu/drm/amd/display/dc/core/dc_link_dp.c +++ b/drivers/gpu/drm/amd/display/dc/core/dc_link_dp.c @@ -2771,8 +2771,11 @@ bool perform_link_training_with_retries( /* Update verified link settings to current one * Because DPIA LT might fallback to lower link setting. */ - link->verified_link_cap.link_rate = link->cur_link_settings.link_rate; - link->verified_link_cap.lane_count = link->cur_link_settings.lane_count; + if (stream->signal == SIGNAL_TYPE_DISPLAY_PORT_MST) { + link->verified_link_cap.link_rate = link->cur_link_settings.link_rate; + link->verified_link_cap.lane_count = link->cur_link_settings.lane_count; + dm_helpers_dp_mst_update_branch_bandwidth(link->ctx, link); + } } } else { status = dc_link_dp_perform_link_training(link, diff --git a/drivers/gpu/drm/amd/display/dc/dm_helpers.h b/drivers/gpu/drm/amd/display/dc/dm_helpers.h index e3e5c39895a3..af1c50ed905a 100644 --- a/drivers/gpu/drm/amd/display/dc/dm_helpers.h +++ b/drivers/gpu/drm/amd/display/dc/dm_helpers.h @@ -116,6 +116,11 @@ bool dm_helpers_dp_mst_start_top_mgr( bool dm_helpers_dp_mst_stop_top_mgr( struct dc_context *ctx, struct dc_link *link); + +void dm_helpers_dp_mst_update_branch_bandwidth( + struct dc_context *ctx, + struct dc_link *link); + /** * OS specific aux read callback. */ |