From be9f6b222c529f315a77c0a182a47c988c28f7f1 Mon Sep 17 00:00:00 2001 From: Mustapha Ghaddar Date: Wed, 26 Oct 2022 13:54:27 -0400 Subject: drm/amd/display: Fix fallback issues for DP LL 1.4a tests [WHY] Unlike DP or USBC, the USB4 link does not get its own encoder and has to share therefore verify_caps is skipped. [HOW] Fix the fallback logic for automated tests and take that into consideration for LT and LS. Reviewed-by: Jun Lei Acked-by: Alan Liu Signed-off-by: Mustapha Ghaddar Tested-by: Daniel Wheeler Signed-off-by: Alex Deucher --- drivers/gpu/drm/amd/display/dc/core/dc_link_dp.c | 22 +++++++++++++++++++--- drivers/gpu/drm/amd/display/dc/core/dc_link_dpia.c | 15 ++++++++++----- drivers/gpu/drm/amd/display/dc/dc_link.h | 1 + 3 files changed, 30 insertions(+), 8 deletions(-) (limited to 'drivers/gpu/drm/amd') 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 b0cfe21871e4..a3e1aeccd3f5 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 @@ -4554,9 +4554,19 @@ void dc_link_dp_handle_link_loss(struct dc_link *link) for (i = 0; i < MAX_PIPES; i++) { pipe_ctx = &link->dc->current_state->res_ctx.pipe_ctx[i]; - if (pipe_ctx && pipe_ctx->stream && !pipe_ctx->stream->dpms_off && - pipe_ctx->stream->link == link && !pipe_ctx->prev_odm_pipe) + if (pipe_ctx && pipe_ctx->stream && !pipe_ctx->stream->dpms_off + && pipe_ctx->stream->link == link && !pipe_ctx->prev_odm_pipe) { + // Always use max settings here for DP 1.4a LL Compliance CTS + if (link->is_automated) { + pipe_ctx->link_config.dp_link_settings.lane_count = + link->verified_link_cap.lane_count; + pipe_ctx->link_config.dp_link_settings.link_rate = + link->verified_link_cap.link_rate; + pipe_ctx->link_config.dp_link_settings.link_spread = + link->verified_link_cap.link_spread; + } core_link_enable_stream(link->dc->current_state, pipe_ctx); + } } } @@ -4597,6 +4607,8 @@ bool dc_link_handle_hpd_rx_irq(struct dc_link *link, union hpd_irq_data *out_hpd } if (hpd_irq_dpcd_data.bytes.device_service_irq.bits.AUTOMATED_TEST) { + // Workaround for DP 1.4a LL Compliance CTS as USB4 has to share encoders unlike DP and USBC + link->is_automated = true; device_service_clear.bits.AUTOMATED_TEST = 1; core_link_write_dpcd( link, @@ -7240,6 +7252,7 @@ void dp_retrain_link_dp_test(struct dc_link *link, struct pipe_ctx *pipes = &link->dc->current_state->res_ctx.pipe_ctx[0]; unsigned int i; + bool do_fallback = false; for (i = 0; i < MAX_PIPES; i++) { @@ -7272,13 +7285,16 @@ void dp_retrain_link_dp_test(struct dc_link *link, memset(&link->cur_link_settings, 0, sizeof(link->cur_link_settings)); + if (link->ep_type == DISPLAY_ENDPOINT_USB4_DPIA) + do_fallback = true; + perform_link_training_with_retries( link_setting, skip_video_pattern, LINK_TRAINING_ATTEMPTS, &pipes[i], SIGNAL_TYPE_DISPLAY_PORT, - false); + do_fallback); link->dc->hwss.enable_stream(&pipes[i]); diff --git a/drivers/gpu/drm/amd/display/dc/core/dc_link_dpia.c b/drivers/gpu/drm/amd/display/dc/core/dc_link_dpia.c index 74e36b34d3f7..d130d58ac08e 100644 --- a/drivers/gpu/drm/amd/display/dc/core/dc_link_dpia.c +++ b/drivers/gpu/drm/amd/display/dc/core/dc_link_dpia.c @@ -791,10 +791,14 @@ static enum link_training_result dpia_training_eq_transparent( } if (dp_is_ch_eq_done(lane_count, dpcd_lane_status) && - dp_is_symbol_locked(link->cur_link_settings.lane_count, dpcd_lane_status) && - dp_is_interlane_aligned(dpcd_lane_status_updated)) { - result = LINK_TRAINING_SUCCESS; - break; + dp_is_symbol_locked(link->cur_link_settings.lane_count, dpcd_lane_status)) { + /* Take into consideration corner case for DP 1.4a LL Compliance CTS as USB4 + * has to share encoders unlike DP and USBC + */ + if (dp_is_interlane_aligned(dpcd_lane_status_updated) || (link->is_automated && retries_eq)) { + result = LINK_TRAINING_SUCCESS; + break; + } } /* Update VS/PE. */ @@ -1008,7 +1012,8 @@ enum link_training_result dc_link_dpia_perform_link_training( */ if (result == LINK_TRAINING_SUCCESS) { msleep(5); - result = dp_check_link_loss_status(link, <_settings); + if (!link->is_automated) + result = dp_check_link_loss_status(link, <_settings); } else if (result == LINK_TRAINING_ABORT) { dpia_training_abort(link, <_settings, repeater_id); } else { diff --git a/drivers/gpu/drm/amd/display/dc/dc_link.h b/drivers/gpu/drm/amd/display/dc/dc_link.h index edb4532eaa39..dc6afe33bca2 100644 --- a/drivers/gpu/drm/amd/display/dc/dc_link.h +++ b/drivers/gpu/drm/amd/display/dc/dc_link.h @@ -184,6 +184,7 @@ struct dc_link { bool is_dig_mapping_flexible; bool hpd_status; /* HPD status of link without physical HPD pin. */ bool is_hpd_pending; /* Indicates a new received hpd */ + bool is_automated; /* Indicates automated testing */ bool edp_sink_present; -- cgit