diff options
| author | David Galiffi <David.Galiffi@amd.com> | 2021-03-11 18:13:12 -0500 |
|---|---|---|
| committer | Alex Deucher <alexander.deucher@amd.com> | 2021-04-09 16:41:15 -0400 |
| commit | 3d223c5528a387f84ed8bdbed2ce05227be9afe0 (patch) | |
| tree | e71565f5cc07d5f1541c01762056ea481f031e7a | |
| parent | 4aa8607e25942077cfc6268b51d6190993c207ab (diff) | |
drm/amd/display: Fixed Clock Recovery Sequence
[Why]
When performing clock recovery, if a pre-emphasis adjustment is
requested, but voltage swing remains constant, the the retry counter
will not be reset. This can lead to prematurely failing link training.
[How]
Reset the clock recovery retry counter if an adjustment is requested
for either voltage swing or pre-emphasis.
Tested-by: Daniel Wheeler <daniel.wheeler@amd.com>
Signed-off-by: Calvin Hou <Calvin.Hou@amd.com>
Signed-off-by: David Galiffi <David.Galiffi@amd.com>
Reviewed-by: Jun Lei <Jun.Lei@amd.com>
Acked-by: Solomon Chiu <solomon.chiu@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
| -rw-r--r-- | drivers/gpu/drm/amd/display/dc/core/dc_link_dp.c | 10 |
1 files changed, 6 insertions, 4 deletions
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 47e6c33f73cb..484d96f78ade 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 @@ -1098,11 +1098,13 @@ static enum link_training_result perform_clock_recovery_sequence( if (is_max_vs_reached(lt_settings)) break; - /* 7. same voltage*/ - /* Note: VS same for all lanes, - * so comparing first lane is sufficient*/ - if (lt_settings->lane_settings[0].VOLTAGE_SWING == + /* 7. same lane settings*/ + /* Note: settings are the same for all lanes, + * so comparing first lane is sufficient*/ + if ((lt_settings->lane_settings[0].VOLTAGE_SWING == req_settings.lane_settings[0].VOLTAGE_SWING) + && (lt_settings->lane_settings[0].PRE_EMPHASIS == + req_settings.lane_settings[0].PRE_EMPHASIS)) retries_cr++; else retries_cr = 0; |