From: Michael Strauss <[email protected]> [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 <[email protected]> Acked-by: Alan Liu <[email protected]> Signed-off-by: Michael Strauss <[email protected]> --- drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_helpers.c | 8 ++++++++ drivers/gpu/drm/amd/display/dc/core/dc_link.c | 4 ++++ drivers/gpu/drm/amd/display/dc/core/dc_link_dp.c | 7 +++++-- drivers/gpu/drm/amd/display/dc/dm_helpers.h | 5 +++++ 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 a21e2ba77ddb..b433fab57670 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 @@ -1009,3 +1009,11 @@ 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 6990b64c0211..945e9ae4e630 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 cf9191053365..24e1164b1bee 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 6abbed22bb20..59ab4f392fc9 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. */ -- 2.25.1
