From: Michael Strauss <[email protected]> [WHY] Only required if FIXED_VS retimer does not support DP2-capable.
[HOW] Gate link rate toggle with DP 128b/132b LTTPR channel coding cap check. Reviewed-by: Charlene Liu <[email protected]> Acked-by: Hamza Mahfooz <[email protected]> Signed-off-by: Michael Strauss <[email protected]> --- .../link_dp_training_fixed_vs_pe_retimer.c | 22 ++++++++++--------- 1 file changed, 12 insertions(+), 10 deletions(-) diff --git a/drivers/gpu/drm/amd/display/dc/link/protocols/link_dp_training_fixed_vs_pe_retimer.c b/drivers/gpu/drm/amd/display/dc/link/protocols/link_dp_training_fixed_vs_pe_retimer.c index c36e0e5df447..b5cf75975fff 100644 --- a/drivers/gpu/drm/amd/display/dc/link/protocols/link_dp_training_fixed_vs_pe_retimer.c +++ b/drivers/gpu/drm/amd/display/dc/link/protocols/link_dp_training_fixed_vs_pe_retimer.c @@ -270,18 +270,20 @@ enum link_training_result dp_perform_fixed_vs_pe_training_sequence( rate = get_dpcd_link_rate(<_settings->link_settings); - /* Vendor specific: Toggle link rate */ - toggle_rate = (rate == 0x6) ? 0xA : 0x6; + if (!link->dpcd_caps.lttpr_caps.main_link_channel_coding.bits.DP_128b_132b_SUPPORTED) { + /* Vendor specific: Toggle link rate */ + toggle_rate = (rate == 0x6) ? 0xA : 0x6; - if (link->vendor_specific_lttpr_link_rate_wa == rate || link->vendor_specific_lttpr_link_rate_wa == 0) { - core_link_write_dpcd( - link, - DP_LINK_BW_SET, - &toggle_rate, - 1); - } + if (link->vendor_specific_lttpr_link_rate_wa == rate || link->vendor_specific_lttpr_link_rate_wa == 0) { + core_link_write_dpcd( + link, + DP_LINK_BW_SET, + &toggle_rate, + 1); + } - link->vendor_specific_lttpr_link_rate_wa = rate; + link->vendor_specific_lttpr_link_rate_wa = rate; + } core_link_write_dpcd(link, DP_LINK_BW_SET, &rate, 1); -- 2.43.0
