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Code Issues Releases Wiki Activity

drm/amd/display: Only update link settings after successful MST link train

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[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>
This commit is contained in:
Michael Strauss 2022-10-20 15:57:36 -04:00 committed by Alex Deucher
parent 1df6b9b07e
commit ea192af507
4 changed files with 22 additions and 2 deletions
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8
drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_helpers.c
View file

@ -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
}

4
drivers/gpu/drm/amd/display/dc/core/dc_link.c
View file

@ -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);

7
drivers/gpu/drm/amd/display/dc/core/dc_link_dp.c
View file

@ -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,

5
drivers/gpu/drm/amd/display/dc/dm_helpers.h
View file

@ -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.
*/