diff options
| author | Jimmy Kizito <Jimmy.Kizito@amd.com> | 2021-04-05 18:05:09 -0400 |
|---|---|---|
| committer | Alex Deucher <alexander.deucher@amd.com> | 2021-10-06 15:51:28 -0400 |
| commit | 31cf79f05d34f4a8040bbeaaf7f03b0fb5fe117f (patch) | |
| tree | 9a412fefdad19219376c3940a8f42d7b19c85231 /drivers/gpu/drm/amd/display/dc/core/dc_link_dp.c | |
| parent | 99447622ae157393296580f9e39224951a1cdcf6 (diff) | |
drm/amd/display: Skip DPCD read for DPTX-to-DPIA hop
[why & how]
Driver does not need to train the first hop.
Reviewed-by: Jun Lei <Jun.Lei@amd.com>
Acked-by: Wayne Lin <Wayne.Lin@amd.com>
Acked-by: Nicholas Kazlauskas <nicholas.kazlauskas@amd.com>
Acked-by: Harry Wentland <harry.wentland@amd.com>
Signed-off-by: Jimmy Kizito <Jimmy.Kizito@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Diffstat (limited to 'drivers/gpu/drm/amd/display/dc/core/dc_link_dp.c')
| -rw-r--r-- | drivers/gpu/drm/amd/display/dc/core/dc_link_dp.c | 7 |
1 files changed, 7 insertions, 0 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 c9477ddbdd5d..13bf1d5ffb25 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 @@ -1775,6 +1775,13 @@ static enum dc_status configure_lttpr_mode_non_transparent( if (encoding == DP_8b_10b_ENCODING) { repeater_cnt = dp_convert_to_count(link->dpcd_caps.lttpr_caps.phy_repeater_cnt); + + /* Driver does not need to train the first hop. Skip DPCD read and clear + * AUX_RD_INTERVAL for DPTX-to-DPIA hop. + */ + if (link->ep_type == DISPLAY_ENDPOINT_USB4_DPIA) + link->dpcd_caps.lttpr_caps.aux_rd_interval[--repeater_cnt] = 0; + for (repeater_id = repeater_cnt; repeater_id > 0; repeater_id--) { aux_interval_address = DP_TRAINING_AUX_RD_INTERVAL_PHY_REPEATER1 + ((DP_REPEATER_CONFIGURATION_AND_STATUS_SIZE) * (repeater_id - 1)); |