From: Michael Strauss michael.strauss@amd.com

[WHY] Current Aux-I sequence checks for local_sink which isn't populated on MST links

[HOW] Leave disable aux-i delay as 0 for MST cases

Cc: stable@vger.kernel.org Reviewed-by: George Shen George.Shen@amd.com Reviewed-by: Aric Cyr Aric.Cyr@amd.com Acked-by: Rodrigo Siqueira Rodrigo.Siqueira@amd.com Signed-off-by: Michael Strauss michael.strauss@amd.com --- .../link_dp_training_fixed_vs_pe_retimer.c | 16 ++++++++++------ 1 file changed, 10 insertions(+), 6 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 fb6c938c6dab..15faaf645b14 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 @@ -233,8 +233,7 @@ enum link_training_result dp_perform_fixed_vs_pe_training_sequence_legacy( link->dpcd_caps.lttpr_caps.phy_repeater_cnt); const uint8_t vendor_lttpr_write_data_intercept_en[4] = {0x1, 0x55, 0x63, 0x0}; const uint8_t vendor_lttpr_write_data_intercept_dis[4] = {0x1, 0x55, 0x63, 0x68}; - uint32_t pre_disable_intercept_delay_ms = - link->local_sink->edid_caps.panel_patch.delay_disable_aux_intercept_ms; + 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}; uint32_t vendor_lttpr_write_address = 0xF004F; @@ -245,6 +244,10 @@ enum link_training_result dp_perform_fixed_vs_pe_training_sequence_legacy( uint8_t toggle_rate; uint8_t rate;

+ if (link->local_sink) + pre_disable_intercept_delay_ms = + link->local_sink->edid_caps.panel_patch.delay_disable_aux_intercept_ms; + /* Only 8b/10b is supported */ ASSERT(link_dp_get_encoding_format(&lt_settings->link_settings) == DP_8b_10b_ENCODING); @@ -595,10 +598,7 @@ enum link_training_result dp_perform_fixed_vs_pe_training_sequence( const uint8_t vendor_lttpr_write_data_adicora_eq3[4] = {0x1, 0x55, 0x63, 0x68}; uint8_t vendor_lttpr_write_data_vs[4] = {0x1, 0x51, 0x63, 0x0}; uint8_t vendor_lttpr_write_data_pe[4] = {0x1, 0x52, 0x63, 0x0}; - uint32_t pre_disable_intercept_delay_ms = - link->local_sink->edid_caps.panel_patch.delay_disable_aux_intercept_ms; - - + uint32_t pre_disable_intercept_delay_ms = 0; uint32_t vendor_lttpr_write_address = 0xF004F; enum link_training_result status = LINK_TRAINING_SUCCESS; uint8_t lane = 0; @@ -607,6 +607,10 @@ enum link_training_result dp_perform_fixed_vs_pe_training_sequence( uint8_t toggle_rate; uint8_t rate;

+ if (link->local_sink) + pre_disable_intercept_delay_ms = + link->local_sink->edid_caps.panel_patch.delay_disable_aux_intercept_ms; + /* Only 8b/10b is supported */ ASSERT(link_dp_get_encoding_format(&lt_settings->link_settings) == DP_8b_10b_ENCODING);