From: Ovidiu Bunea <[email protected]> [Why] In some vendor specific retimer setups for downstream 4-lane HBR3 configuration, the sink will show severe corruption (horizontal shifting) and intermittent blanking.
[How] Add new retimer programming sequence before clock recovery when 4 lanes are active. Reviewed-by: Michael Strauss <[email protected]> Acked-by: Alex Hung <[email protected]> Signed-off-by: Ovidiu Bunea <[email protected]> --- .../link_dp_training_fixed_vs_pe_retimer.c | 67 ++++++++++++++++++- 1 file changed, 66 insertions(+), 1 deletion(-) 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 2a4f70acc7fa..ca0543e62917 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 @@ -236,6 +236,11 @@ enum link_training_result dp_perform_fixed_vs_pe_training_sequence_legacy( uint32_t pre_disable_intercept_delay_ms = 0; uint8_t vendor_lttpr_write_data_vs[4] = {0x1, 0x51, 0x63, 0x0}; uint8_t vendor_lttpr_write_data_pe[4] = {0x1, 0x52, 0x63, 0x0}; + const uint8_t vendor_lttpr_write_data_4lane_1[4] = {0x1, 0x6E, 0xF2, 0x19}; + const uint8_t vendor_lttpr_write_data_4lane_2[4] = {0x1, 0x6B, 0xF2, 0x01}; + const uint8_t vendor_lttpr_write_data_4lane_3[4] = {0x1, 0x6D, 0xF2, 0x18}; + const uint8_t vendor_lttpr_write_data_4lane_4[4] = {0x1, 0x6C, 0xF2, 0x03}; + const uint8_t vendor_lttpr_write_data_4lane_5[4] = {0x1, 0x03, 0xF3, 0x06}; uint32_t vendor_lttpr_write_address = 0xF004F; enum link_training_result status = LINK_TRAINING_SUCCESS; uint8_t lane = 0; @@ -338,6 +343,34 @@ enum link_training_result dp_perform_fixed_vs_pe_training_sequence_legacy( DP_DOWNSPREAD_CTRL, lt_settings->link_settings.link_spread); + if (lt_settings->link_settings.lane_count == LANE_COUNT_FOUR) { + core_link_write_dpcd( + link, + vendor_lttpr_write_address, + &vendor_lttpr_write_data_4lane_1[0], + sizeof(vendor_lttpr_write_data_4lane_1)); + core_link_write_dpcd( + link, + vendor_lttpr_write_address, + &vendor_lttpr_write_data_4lane_2[0], + sizeof(vendor_lttpr_write_data_4lane_2)); + core_link_write_dpcd( + link, + vendor_lttpr_write_address, + &vendor_lttpr_write_data_4lane_3[0], + sizeof(vendor_lttpr_write_data_4lane_3)); + core_link_write_dpcd( + link, + vendor_lttpr_write_address, + &vendor_lttpr_write_data_4lane_4[0], + sizeof(vendor_lttpr_write_data_4lane_4)); + core_link_write_dpcd( + link, + vendor_lttpr_write_address, + &vendor_lttpr_write_data_4lane_5[0], + sizeof(vendor_lttpr_write_data_4lane_5)); + } + /* 2. Perform link training */ /* Perform Clock Recovery Sequence */ @@ -598,7 +631,11 @@ enum link_training_result dp_perform_fixed_vs_pe_training_sequence( uint32_t pre_disable_intercept_delay_ms = 0; uint8_t vendor_lttpr_write_data_vs[4] = {0x1, 0x51, 0x63, 0x0}; uint8_t vendor_lttpr_write_data_pe[4] = {0x1, 0x52, 0x63, 0x0}; - + const uint8_t vendor_lttpr_write_data_4lane_1[4] = {0x1, 0x6E, 0xF2, 0x19}; + const uint8_t vendor_lttpr_write_data_4lane_2[4] = {0x1, 0x6B, 0xF2, 0x01}; + const uint8_t vendor_lttpr_write_data_4lane_3[4] = {0x1, 0x6D, 0xF2, 0x18}; + const uint8_t vendor_lttpr_write_data_4lane_4[4] = {0x1, 0x6C, 0xF2, 0x03}; + const uint8_t vendor_lttpr_write_data_4lane_5[4] = {0x1, 0x03, 0xF3, 0x06}; uint32_t vendor_lttpr_write_address = 0xF004F; enum link_training_result status = LINK_TRAINING_SUCCESS; uint8_t lane = 0; @@ -701,6 +738,34 @@ enum link_training_result dp_perform_fixed_vs_pe_training_sequence( DP_DOWNSPREAD_CTRL, lt_settings->link_settings.link_spread); + if (lt_settings->link_settings.lane_count == LANE_COUNT_FOUR) { + core_link_write_dpcd( + link, + vendor_lttpr_write_address, + &vendor_lttpr_write_data_4lane_1[0], + sizeof(vendor_lttpr_write_data_4lane_1)); + core_link_write_dpcd( + link, + vendor_lttpr_write_address, + &vendor_lttpr_write_data_4lane_2[0], + sizeof(vendor_lttpr_write_data_4lane_2)); + core_link_write_dpcd( + link, + vendor_lttpr_write_address, + &vendor_lttpr_write_data_4lane_3[0], + sizeof(vendor_lttpr_write_data_4lane_3)); + core_link_write_dpcd( + link, + vendor_lttpr_write_address, + &vendor_lttpr_write_data_4lane_4[0], + sizeof(vendor_lttpr_write_data_4lane_4)); + core_link_write_dpcd( + link, + vendor_lttpr_write_address, + &vendor_lttpr_write_data_4lane_5[0], + sizeof(vendor_lttpr_write_data_4lane_5)); + } + /* 2. Perform link training */ /* Perform Clock Recovery Sequence */ -- 2.41.0
