diff options
| author | David Galiffi <david.galiffi@amd.com> | 2019-06-24 10:34:13 -0400 |
|---|---|---|
| committer | Alex Deucher <alexander.deucher@amd.com> | 2019-08-15 10:53:30 -0500 |
| commit | 0b226322434c7786381d7a594efca9cc46f85211 (patch) | |
| tree | 77444e6807ceac9e22bf0f4344af6d76604c7a01 /drivers/gpu/drm/amd/display/dc/dc_link.h | |
| parent | 36756dcbcf474466f7243fcec21af90ee40e72be (diff) | |
drm/amd/display: Synchronous DisplayPort Link Training
[WHY]
We require a method to perform synchronous link training.
[HOW]
Sync LT is broken into 3 basic steps.
"Begin" starts the state machine, and resets "preferred" link settings.
"Attempt" will attempt to train the link with a given set of training
parameters.
"End" stops the state machine, and will optionally disable the link phy.
Between "Begin" and "End" DPCD:600h must not be set to "2"
(D3:Powered Down).
Between "Begin" and "End", there may be multiple "Attempts" with different
training parameters.
Signed-off-by: David Galiffi <david.galiffi@amd.com>
Reviewed-by: Jun Lei <Jun.Lei@amd.com>
Acked-by: Leo Li <sunpeng.li@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Diffstat (limited to 'drivers/gpu/drm/amd/display/dc/dc_link.h')
| -rw-r--r-- | drivers/gpu/drm/amd/display/dc/dc_link.h | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/drivers/gpu/drm/amd/display/dc/dc_link.h b/drivers/gpu/drm/amd/display/dc/dc_link.h index d6ff5af70c71..9ea75db3484e 100644 --- a/drivers/gpu/drm/amd/display/dc/dc_link.h +++ b/drivers/gpu/drm/amd/display/dc/dc_link.h @@ -84,6 +84,7 @@ struct dc_link { bool dp_ss_off; bool link_state_valid; bool aux_access_disabled; + bool sync_lt_in_progress; /* caps is the same as reported_link_cap. link_traing use * reported_link_cap. Will clean up. TODO @@ -228,6 +229,15 @@ enum link_training_result dc_link_dp_perform_link_training( const struct dc_link_settings *link_setting, bool skip_video_pattern); +bool dc_link_dp_sync_lt_begin(struct dc_link *link); + +enum link_training_result dc_link_dp_sync_lt_attempt( + struct dc_link *link, + struct dc_link_settings *link_setting, + struct dc_link_training_overrides *lt_settings); + +bool dc_link_dp_sync_lt_end(struct dc_link *link, bool link_down); + void dc_link_dp_enable_hpd(const struct dc_link *link); void dc_link_dp_disable_hpd(const struct dc_link *link); |