diff options
Diffstat (limited to 'drivers/gpu/drm/amd/display/dc/link')
12 files changed, 166 insertions, 85 deletions
diff --git a/drivers/gpu/drm/amd/display/dc/link/link_detection.c b/drivers/gpu/drm/amd/display/dc/link/link_detection.c index cc9191a5c9e6..9655e6fa53a4 100644 --- a/drivers/gpu/drm/amd/display/dc/link/link_detection.c +++ b/drivers/gpu/drm/amd/display/dc/link/link_detection.c @@ -611,6 +611,7 @@ static bool detect_dp(struct dc_link *link, link->dpcd_caps.dongle_type = sink_caps->dongle_type; link->dpcd_caps.is_dongle_type_one = sink_caps->is_dongle_type_one; link->dpcd_caps.dpcd_rev.raw = 0; + link->dpcd_caps.usb4_dp_tun_info.dp_tun_cap.raw = 0; } return true; @@ -1007,21 +1008,11 @@ static bool detect_link_and_local_sink(struct dc_link *link, link->reported_link_cap.link_rate > LINK_RATE_HIGH3) link->reported_link_cap.link_rate = LINK_RATE_HIGH3; - /* - * If this is DP over USB4 link then we need to: - * - Enable BW ALLOC support on DPtx if applicable - */ - if (dc->config.usb4_bw_alloc_support) { - if (link_dp_dpia_set_dptx_usb4_bw_alloc_support(link)) { - /* update with non reduced link cap if bw allocation mode is supported */ - if (link->dpia_bw_alloc_config.nrd_max_link_rate && - link->dpia_bw_alloc_config.nrd_max_lane_count) { - link->reported_link_cap.link_rate = - link->dpia_bw_alloc_config.nrd_max_link_rate; - link->reported_link_cap.lane_count = - link->dpia_bw_alloc_config.nrd_max_lane_count; - } - } + if (link->dpcd_caps.usb4_dp_tun_info.dp_tun_cap.bits.dp_tunneling + && link->dpcd_caps.usb4_dp_tun_info.dp_tun_cap.bits.dpia_bw_alloc + && link->dpcd_caps.usb4_dp_tun_info.driver_bw_cap.bits.driver_bw_alloc_support) { + if (link_dpia_enable_usb4_dp_bw_alloc_mode(link) == false) + link->dpcd_caps.usb4_dp_tun_info.dp_tun_cap.bits.dpia_bw_alloc = false; } break; } diff --git a/drivers/gpu/drm/amd/display/dc/link/link_dpms.c b/drivers/gpu/drm/amd/display/dc/link/link_dpms.c index 268626e73c54..273a3be6d593 100644 --- a/drivers/gpu/drm/amd/display/dc/link/link_dpms.c +++ b/drivers/gpu/drm/amd/display/dc/link/link_dpms.c @@ -148,6 +148,7 @@ void link_blank_dp_stream(struct dc_link *link, bool hw_init) void link_set_all_streams_dpms_off_for_link(struct dc_link *link) { struct pipe_ctx *pipes[MAX_PIPES]; + struct dc_stream_state *streams[MAX_PIPES]; struct dc_state *state = link->dc->current_state; uint8_t count; int i; @@ -160,10 +161,18 @@ void link_set_all_streams_dpms_off_for_link(struct dc_link *link) link_get_master_pipes_with_dpms_on(link, state, &count, pipes); + /* The subsequent call to dc_commit_updates_for_stream for a full update + * will release the current state and swap to a new state. Releasing the + * current state results in the stream pointers in the pipe_ctx structs + * to be zero'd. Hence, cache all streams prior to dc_commit_updates_for_stream. + */ + for (i = 0; i < count; i++) + streams[i] = pipes[i]->stream; + for (i = 0; i < count; i++) { - stream_update.stream = pipes[i]->stream; + stream_update.stream = streams[i]; dc_commit_updates_for_stream(link->ctx->dc, NULL, 0, - pipes[i]->stream, &stream_update, + streams[i], &stream_update, state); } @@ -2365,7 +2374,7 @@ void link_set_dpms_off(struct pipe_ctx *pipe_ctx) update_psp_stream_config(pipe_ctx, true); dc->hwss.blank_stream(pipe_ctx); - if (pipe_ctx->stream->link->ep_type == DISPLAY_ENDPOINT_USB4_DPIA) + if (pipe_ctx->link_config.dp_tunnel_settings.should_use_dp_bw_allocation) deallocate_usb4_bandwidth(pipe_ctx->stream); if (pipe_ctx->stream->signal == SIGNAL_TYPE_DISPLAY_PORT_MST) @@ -2433,7 +2442,7 @@ void link_set_dpms_off(struct pipe_ctx *pipe_ctx) if (link->connector_signal == SIGNAL_TYPE_EDP && dc->debug.psp_disabled_wa) { /* reset internal save state to default since eDP is off */ enum dp_panel_mode panel_mode = dp_get_panel_mode(pipe_ctx->stream->link); - /* since current psp not loaded, we need to reset it to default*/ + /* since current psp not loaded, we need to reset it to default */ link->panel_mode = panel_mode; } } @@ -2611,7 +2620,7 @@ void link_set_dpms_on( if (dc_is_dp_signal(pipe_ctx->stream->signal)) dp_set_hblank_reduction_on_rx(pipe_ctx); - if (pipe_ctx->stream->link->ep_type == DISPLAY_ENDPOINT_USB4_DPIA) + if (pipe_ctx->link_config.dp_tunnel_settings.should_use_dp_bw_allocation) allocate_usb4_bandwidth(pipe_ctx->stream); if (pipe_ctx->stream->signal == SIGNAL_TYPE_DISPLAY_PORT_MST) diff --git a/drivers/gpu/drm/amd/display/dc/link/link_factory.c b/drivers/gpu/drm/amd/display/dc/link/link_factory.c index 0125f2cfc114..1a04f4b74585 100644 --- a/drivers/gpu/drm/amd/display/dc/link/link_factory.c +++ b/drivers/gpu/drm/amd/display/dc/link/link_factory.c @@ -156,6 +156,7 @@ static void construct_link_service_dp_capability(struct link_service *link_srv) link_srv->dp_get_encoding_format = link_dp_get_encoding_format; link_srv->dp_should_enable_fec = dp_should_enable_fec; link_srv->dp_decide_link_settings = link_decide_link_settings; + link_srv->dp_decide_tunnel_settings = link_decide_dp_tunnel_settings; link_srv->mst_decide_link_encoding_format = mst_decide_link_encoding_format; link_srv->edp_decide_link_settings = edp_decide_link_settings; diff --git a/drivers/gpu/drm/amd/display/dc/link/protocols/link_dp_capability.c b/drivers/gpu/drm/amd/display/dc/link/protocols/link_dp_capability.c index 21ee0d96c9d4..8f79881ad9f1 100644 --- a/drivers/gpu/drm/amd/display/dc/link/protocols/link_dp_capability.c +++ b/drivers/gpu/drm/amd/display/dc/link/protocols/link_dp_capability.c @@ -158,6 +158,14 @@ uint8_t dp_parse_lttpr_repeater_count(uint8_t lttpr_repeater_count) return 0; // invalid value } +uint32_t dp_get_closest_lttpr_offset(uint8_t lttpr_count) +{ + /* Calculate offset for LTTPR closest to DPTX which is highest in the chain + * Offset is 0 for single LTTPR cases as base LTTPR DPCD addresses target LTTPR 1 + */ + return DP_REPEATER_CONFIGURATION_AND_STATUS_SIZE * (lttpr_count - 1); +} + uint32_t link_bw_kbps_from_raw_frl_link_rate_data(uint8_t bw) { switch (bw) { @@ -2013,11 +2021,9 @@ static bool retrieve_link_cap(struct dc_link *link) sizeof(link->dpcd_caps.max_uncompressed_pixel_rate_cap.raw)); /* Read DP tunneling information. */ - if (link->ep_type == DISPLAY_ENDPOINT_USB4_DPIA) { - status = dpcd_get_tunneling_device_data(link); - if (status != DC_OK) - dm_error("%s: Read DP tunneling device data failed.\n", __func__); - } + status = dpcd_get_tunneling_device_data(link); + if (status != DC_OK) + dm_error("%s: Read DP tunneling device data failed.\n", __func__); retrieve_cable_id(link); dpcd_write_cable_id_to_dprx(link); diff --git a/drivers/gpu/drm/amd/display/dc/link/protocols/link_dp_capability.h b/drivers/gpu/drm/amd/display/dc/link/protocols/link_dp_capability.h index 0ce0af3ddbeb..940b147cc5d4 100644 --- a/drivers/gpu/drm/amd/display/dc/link/protocols/link_dp_capability.h +++ b/drivers/gpu/drm/amd/display/dc/link/protocols/link_dp_capability.h @@ -48,6 +48,9 @@ enum dc_status dp_retrieve_lttpr_cap(struct dc_link *link); /* Convert PHY repeater count read from DPCD uint8_t. */ uint8_t dp_parse_lttpr_repeater_count(uint8_t lttpr_repeater_count); +/* Calculate embedded LTTPR address offset for vendor-specific behaviour */ +uint32_t dp_get_closest_lttpr_offset(uint8_t lttpr_count); + bool dp_is_sink_present(struct dc_link *link); bool dp_is_lttpr_present(struct dc_link *link); diff --git a/drivers/gpu/drm/amd/display/dc/link/protocols/link_dp_dpia.c b/drivers/gpu/drm/amd/display/dc/link/protocols/link_dp_dpia.c index c149210096ac..22bfdced64ab 100644 --- a/drivers/gpu/drm/amd/display/dc/link/protocols/link_dp_dpia.c +++ b/drivers/gpu/drm/amd/display/dc/link/protocols/link_dp_dpia.c @@ -62,6 +62,36 @@ enum dc_status dpcd_get_tunneling_device_data(struct dc_link *link) if (status != DC_OK) goto err; + link->dpcd_caps.usb4_dp_tun_info.dp_tun_cap.raw = + dpcd_dp_tun_data[DP_TUNNELING_CAPABILITIES_SUPPORT - DP_TUNNELING_CAPABILITIES_SUPPORT]; + + if (link->dpcd_caps.usb4_dp_tun_info.dp_tun_cap.bits.dp_tunneling == false) + goto err; + + link->dpcd_caps.usb4_dp_tun_info.dpia_info.raw = + dpcd_dp_tun_data[DP_IN_ADAPTER_INFO - DP_TUNNELING_CAPABILITIES_SUPPORT]; + link->dpcd_caps.usb4_dp_tun_info.usb4_driver_id = + dpcd_dp_tun_data[DP_USB4_DRIVER_ID - DP_TUNNELING_CAPABILITIES_SUPPORT]; + + if (link->dpcd_caps.usb4_dp_tun_info.dp_tun_cap.bits.dpia_bw_alloc) { + status = core_link_read_dpcd(link, USB4_DRIVER_BW_CAPABILITY, + dpcd_dp_tun_data, 1); + + if (status != DC_OK) + goto err; + + link->dpcd_caps.usb4_dp_tun_info.driver_bw_cap.raw = dpcd_dp_tun_data[0]; + } + + DC_LOG_DEBUG("%s: Link[%d] DP tunneling support (RouterId=%d AdapterId=%d) " + "DPIA_BW_Alloc_support=%d " + "CM_BW_Alloc_support=%d ", + __func__, link->link_index, + link->dpcd_caps.usb4_dp_tun_info.usb4_driver_id, + link->dpcd_caps.usb4_dp_tun_info.dpia_info.bits.dpia_num, + link->dpcd_caps.usb4_dp_tun_info.dp_tun_cap.bits.dpia_bw_alloc, + link->dpcd_caps.usb4_dp_tun_info.driver_bw_cap.bits.driver_bw_alloc_support); + status = core_link_read_dpcd( link, DP_USB4_ROUTER_TOPOLOGY_ID, @@ -71,13 +101,6 @@ enum dc_status dpcd_get_tunneling_device_data(struct dc_link *link) if (status != DC_OK) goto err; - link->dpcd_caps.usb4_dp_tun_info.dp_tun_cap.raw = - dpcd_dp_tun_data[DP_TUNNELING_CAPABILITIES_SUPPORT - DP_TUNNELING_CAPABILITIES_SUPPORT]; - link->dpcd_caps.usb4_dp_tun_info.dpia_info.raw = - dpcd_dp_tun_data[DP_IN_ADAPTER_INFO - DP_TUNNELING_CAPABILITIES_SUPPORT]; - link->dpcd_caps.usb4_dp_tun_info.usb4_driver_id = - dpcd_dp_tun_data[DP_USB4_DRIVER_ID - DP_TUNNELING_CAPABILITIES_SUPPORT]; - for (i = 0; i < DPCD_USB4_TOPOLOGY_ID_LEN; i++) link->dpcd_caps.usb4_dp_tun_info.usb4_topology_id[i] = dpcd_topology_data[i]; @@ -120,3 +143,20 @@ bool dpia_query_hpd_status(struct dc_link *link) return link->hpd_status; } +void link_decide_dp_tunnel_settings(struct dc_stream_state *stream, + struct dc_tunnel_settings *dp_tunnel_setting) +{ + struct dc_link *link = stream->link; + + memset(dp_tunnel_setting, 0, sizeof(*dp_tunnel_setting)); + + if ((stream->signal == SIGNAL_TYPE_DISPLAY_PORT) || (stream->signal == SIGNAL_TYPE_DISPLAY_PORT_MST)) { + dp_tunnel_setting->should_enable_dp_tunneling = + link->dpcd_caps.usb4_dp_tun_info.dp_tun_cap.bits.dp_tunneling; + + if (link->dpcd_caps.usb4_dp_tun_info.dp_tun_cap.bits.dpia_bw_alloc + && link->dpcd_caps.usb4_dp_tun_info.driver_bw_cap.bits.driver_bw_alloc_support) + dp_tunnel_setting->should_use_dp_bw_allocation = true; + } +} + diff --git a/drivers/gpu/drm/amd/display/dc/link/protocols/link_dp_dpia.h b/drivers/gpu/drm/amd/display/dc/link/protocols/link_dp_dpia.h index 363f45a1a964..a61edfc9ca7a 100644 --- a/drivers/gpu/drm/amd/display/dc/link/protocols/link_dp_dpia.h +++ b/drivers/gpu/drm/amd/display/dc/link/protocols/link_dp_dpia.h @@ -38,4 +38,10 @@ enum dc_status dpcd_get_tunneling_device_data(struct dc_link *link); * Returns true if HPD high. */ bool dpia_query_hpd_status(struct dc_link *link); + +/* Decide the DP tunneling settings based on the DPCD capabilities + */ +void link_decide_dp_tunnel_settings(struct dc_stream_state *stream, + struct dc_tunnel_settings *dp_tunnel_setting); + #endif /* __DC_LINK_DPIA_H__ */ diff --git a/drivers/gpu/drm/amd/display/dc/link/protocols/link_dp_dpia_bw.c b/drivers/gpu/drm/amd/display/dc/link/protocols/link_dp_dpia_bw.c index a254ead2f7e8..3af7564a84f1 100644 --- a/drivers/gpu/drm/amd/display/dc/link/protocols/link_dp_dpia_bw.c +++ b/drivers/gpu/drm/amd/display/dc/link/protocols/link_dp_dpia_bw.c @@ -46,9 +46,10 @@ */ static bool link_dp_is_bw_alloc_available(struct dc_link *link) { - return (link && link->ep_type == DISPLAY_ENDPOINT_USB4_DPIA - && link->hpd_status - && link->dpia_bw_alloc_config.bw_alloc_enabled); + return (link && link->hpd_status + && link->dpcd_caps.usb4_dp_tun_info.dp_tun_cap.bits.dp_tunneling + && link->dpcd_caps.usb4_dp_tun_info.dp_tun_cap.bits.dpia_bw_alloc + && link->dpcd_caps.usb4_dp_tun_info.driver_bw_cap.bits.driver_bw_alloc_support); } static void reset_bw_alloc_struct(struct dc_link *link) @@ -141,7 +142,7 @@ static int get_non_reduced_max_lane_count(struct dc_link *link) * granuality, Driver_ID, CM_Group, & populate the BW allocation structs * for host router and dpia */ -static void init_usb4_bw_struct(struct dc_link *link) +static void retrieve_usb4_dp_bw_allocation_info(struct dc_link *link) { reset_bw_alloc_struct(link); @@ -282,49 +283,26 @@ static void link_dpia_send_bw_alloc_request(struct dc_link *link, int req_bw) // ------------------------------------------------------------------ // PUBLIC FUNCTIONS // ------------------------------------------------------------------ -bool link_dp_dpia_set_dptx_usb4_bw_alloc_support(struct dc_link *link) +bool link_dpia_enable_usb4_dp_bw_alloc_mode(struct dc_link *link) { bool ret = false; - uint8_t response = 0, - bw_support_dpia = 0, - bw_support_cm = 0; + uint8_t val; - if (!(link->ep_type == DISPLAY_ENDPOINT_USB4_DPIA && link->hpd_status)) - goto out; + if (link->hpd_status) { + val = DPTX_BW_ALLOC_MODE_ENABLE | DPTX_BW_ALLOC_UNMASK_IRQ; - if (core_link_read_dpcd( - link, - DP_TUNNELING_CAPABILITIES, - &response, - sizeof(uint8_t)) == DC_OK) - bw_support_dpia = (response >> 7) & 1; - - if (core_link_read_dpcd( - link, - USB4_DRIVER_BW_CAPABILITY, - &response, - sizeof(uint8_t)) == DC_OK) - bw_support_cm = (response >> 7) & 1; - - /* Send request acknowledgment to Turn ON DPTX support */ - if (bw_support_cm && bw_support_dpia) { - - response = 0x80; - if (core_link_write_dpcd( - link, - DPTX_BW_ALLOCATION_MODE_CONTROL, - &response, - sizeof(uint8_t)) != DC_OK) { - DC_LOG_DEBUG("%s: FAILURE Enabling DPtx BW Allocation Mode Support for link(%d)\n", - __func__, link->link_index); - } else { - // SUCCESS Enabled DPtx BW Allocation Mode Support - DC_LOG_DEBUG("%s: SUCCESS Enabling DPtx BW Allocation Mode Support for link(%d)\n", - __func__, link->link_index); + if (core_link_write_dpcd(link, DPTX_BW_ALLOCATION_MODE_CONTROL, &val, sizeof(uint8_t)) == DC_OK) { + DC_LOG_DEBUG("%s: link[%d] DPTX BW allocation mode enabled", __func__, link->link_index); + + retrieve_usb4_dp_bw_allocation_info(link); + + if (link->dpia_bw_alloc_config.nrd_max_link_rate && link->dpia_bw_alloc_config.nrd_max_lane_count) { + link->reported_link_cap.link_rate = link->dpia_bw_alloc_config.nrd_max_link_rate; + link->reported_link_cap.lane_count = link->dpia_bw_alloc_config.nrd_max_lane_count; + } - ret = true; - init_usb4_bw_struct(link); link->dpia_bw_alloc_config.bw_alloc_enabled = true; + ret = true; /* * During DP tunnel creation, CM preallocates BW and reduces estimated BW of other @@ -332,11 +310,12 @@ bool link_dp_dpia_set_dptx_usb4_bw_alloc_support(struct dc_link *link) * to make the CM to release preallocation and update estimated BW correctly for * all DPIAs per host router */ + // TODO: Zero allocation can be removed once the MSFT CM fix has been released link_dp_dpia_allocate_usb4_bandwidth_for_stream(link, 0); - } + } else + DC_LOG_DEBUG("%s: link[%d] failed to enable DPTX BW allocation mode", __func__, link->link_index); } -out: return ret; } @@ -378,7 +357,8 @@ void link_dp_dpia_handle_bw_alloc_status(struct dc_link *link, uint8_t status) */ void dpia_handle_usb4_bandwidth_allocation_for_link(struct dc_link *link, int peak_bw) { - if (link && link->ep_type == DISPLAY_ENDPOINT_USB4_DPIA && link->dpia_bw_alloc_config.bw_alloc_enabled) { + if (link && link->dpcd_caps.usb4_dp_tun_info.dp_tun_cap.bits.dp_tunneling + && link->dpia_bw_alloc_config.bw_alloc_enabled) { //1. Hot Plug if (link->hpd_status && peak_bw > 0) { // If DP over USB4 then we need to check BW allocation @@ -401,7 +381,7 @@ void link_dp_dpia_allocate_usb4_bandwidth_for_stream(struct dc_link *link, int r if (link_dp_is_bw_alloc_available(link)) link_dpia_send_bw_alloc_request(link, req_bw); else - DC_LOG_DEBUG("%s: Not able to send the BW Allocation request", __func__); + DC_LOG_DEBUG("%s: BW Allocation mode not available", __func__); } bool dpia_validate_usb4_bw(struct dc_link **link, int *bw_needed_per_dpia, const unsigned int num_dpias) diff --git a/drivers/gpu/drm/amd/display/dc/link/protocols/link_dp_dpia_bw.h b/drivers/gpu/drm/amd/display/dc/link/protocols/link_dp_dpia_bw.h index 6df9b946b00f..801965b5f9a4 100644 --- a/drivers/gpu/drm/amd/display/dc/link/protocols/link_dp_dpia_bw.h +++ b/drivers/gpu/drm/amd/display/dc/link/protocols/link_dp_dpia_bw.h @@ -43,13 +43,13 @@ enum bw_type { }; /* - * Enable BW Allocation Mode Support from the DP-Tx side + * Enable USB4 DP BW allocation mode * * @link: pointer to the dc_link struct instance * * return: SUCCESS or FAILURE */ -bool link_dp_dpia_set_dptx_usb4_bw_alloc_support(struct dc_link *link); +bool link_dpia_enable_usb4_dp_bw_alloc_mode(struct dc_link *link); /* * Allocates only what the stream needs for bw, so if: diff --git a/drivers/gpu/drm/amd/display/dc/link/protocols/link_dp_irq_handler.c b/drivers/gpu/drm/amd/display/dc/link/protocols/link_dp_irq_handler.c index 991b8ad4984b..693477413347 100644 --- a/drivers/gpu/drm/amd/display/dc/link/protocols/link_dp_irq_handler.c +++ b/drivers/gpu/drm/amd/display/dc/link/protocols/link_dp_irq_handler.c @@ -352,7 +352,7 @@ enum dc_status dp_read_hpd_rx_irq_data( irq_data->raw, DP_SINK_STATUS - DP_SINK_COUNT + 1); - if (link->ep_type == DISPLAY_ENDPOINT_USB4_DPIA) { + if (link->dpcd_caps.usb4_dp_tun_info.dp_tun_cap.bits.dp_tunneling) { retval = core_link_read_dpcd( link, DP_LINK_SERVICE_IRQ_VECTOR_ESI0, &irq_data->bytes.link_service_irq_esi0.raw, 1); @@ -521,7 +521,7 @@ bool dp_handle_hpd_rx_irq(struct dc_link *link, dp_trace_link_loss_increment(link); } - if (link->ep_type == DISPLAY_ENDPOINT_USB4_DPIA) { + if (link->dpcd_caps.usb4_dp_tun_info.dp_tun_cap.bits.dp_tunneling) { if (hpd_irq_dpcd_data.bytes.link_service_irq_esi0.bits.DP_LINK_TUNNELING_IRQ) dp_handle_tunneling_irq(link); } diff --git a/drivers/gpu/drm/amd/display/dc/link/protocols/link_dp_training.c b/drivers/gpu/drm/amd/display/dc/link/protocols/link_dp_training.c index ef358afdfb65..2dc1a660e504 100644 --- a/drivers/gpu/drm/amd/display/dc/link/protocols/link_dp_training.c +++ b/drivers/gpu/drm/amd/display/dc/link/protocols/link_dp_training.c @@ -785,7 +785,6 @@ void override_training_settings( lt_settings->lttpr_mode = LTTPR_MODE_NON_LTTPR; dp_get_lttpr_mode_override(link, <_settings->lttpr_mode); - } enum dc_dp_training_pattern decide_cr_training_pattern( diff --git a/drivers/gpu/drm/amd/display/dc/link/protocols/link_dp_training_8b_10b.c b/drivers/gpu/drm/amd/display/dc/link/protocols/link_dp_training_8b_10b.c index 5a5d48fadbf2..66d0fb1b9b9d 100644 --- a/drivers/gpu/drm/amd/display/dc/link/protocols/link_dp_training_8b_10b.c +++ b/drivers/gpu/drm/amd/display/dc/link/protocols/link_dp_training_8b_10b.c @@ -142,6 +142,14 @@ void decide_8b_10b_training_settings( lt_settings->lttpr_mode = dp_decide_8b_10b_lttpr_mode(link); lt_settings->cr_pattern_time = get_cr_training_aux_rd_interval(link, link_setting, lt_settings->lttpr_mode); dp_hw_to_dpcd_lane_settings(lt_settings, lt_settings->hw_lane_settings, lt_settings->dpcd_lane_settings); + + /* Some embedded LTTPRs rely on receiving TPS2 before LT to interop reliably with sensitive VGA dongles + * This allows these LTTPRs to minimize freq/phase and skew variation during lock and deskew sequences + */ + if ((link->chip_caps & AMD_EXT_DISPLAY_PATH_CAPS__EXT_CHIP_MASK) == + AMD_EXT_DISPLAY_PATH_CAPS__DP_EARLY_8B10B_TPS2) { + lt_settings->lttpr_early_tps2 = true; + } } enum lttpr_mode dp_decide_8b_10b_lttpr_mode(struct dc_link *link) @@ -173,6 +181,42 @@ enum lttpr_mode dp_decide_8b_10b_lttpr_mode(struct dc_link *link) return LTTPR_MODE_NON_LTTPR; } +static void set_link_settings_and_perform_early_tps2_retimer_pre_lt_sequence(struct dc_link *link, + const struct link_resource *link_res, + struct link_training_settings *lt_settings, + uint32_t lttpr_count) +{ + /* Vendor-specific LTTPR early TPS2 sequence: + * 1. Output TPS2 + * 2. Wait 400us + * 3. Set link settings as usual + * 4. Write TPS1 to DP_TRAINING_PATTERN_SET_PHY_REPEATERx targeting LTTPR closest to host + * 5. Wait 1ms + * 6. Begin link training as usual + * */ + + uint32_t closest_lttpr_address_offset = dp_get_closest_lttpr_offset(lttpr_count); + + union dpcd_training_pattern dpcd_pattern = {0}; + + dpcd_pattern.v1_4.TRAINING_PATTERN_SET = 1; + dpcd_pattern.v1_4.SCRAMBLING_DISABLE = 1; + + DC_LOG_HW_LINK_TRAINING("%s\n GPU sends TPS2. Wait 400us.\n", __func__); + + dp_set_hw_training_pattern(link, link_res, DP_TRAINING_PATTERN_SEQUENCE_2, DPRX); + + dp_set_hw_lane_settings(link, link_res, lt_settings, DPRX); + + udelay(400); + + dpcd_set_link_settings(link, lt_settings); + + core_link_write_dpcd(link, DP_TRAINING_PATTERN_SET_PHY_REPEATER1 + closest_lttpr_address_offset, &dpcd_pattern.raw, 1); + + udelay(1000); + } + enum link_training_result perform_8b_10b_clock_recovery_sequence( struct dc_link *link, const struct link_resource *link_res, @@ -383,7 +427,7 @@ enum link_training_result dp_perform_8b_10b_link_training( { enum link_training_result status = LINK_TRAINING_SUCCESS; - uint8_t repeater_cnt; + uint8_t repeater_cnt = dp_parse_lttpr_repeater_count(link->dpcd_caps.lttpr_caps.phy_repeater_cnt); uint8_t repeater_id; uint8_t lane = 0; @@ -391,14 +435,16 @@ enum link_training_result dp_perform_8b_10b_link_training( start_clock_recovery_pattern_early(link, link_res, lt_settings, DPRX); /* 1. set link rate, lane count and spread. */ - dpcd_set_link_settings(link, lt_settings); + if (lt_settings->lttpr_early_tps2) + set_link_settings_and_perform_early_tps2_retimer_pre_lt_sequence(link, link_res, lt_settings, repeater_cnt); + else + dpcd_set_link_settings(link, lt_settings); if (lt_settings->lttpr_mode == LTTPR_MODE_NON_TRANSPARENT) { /* 2. perform link training (set link training done * to false is done as well) */ - repeater_cnt = dp_parse_lttpr_repeater_count(link->dpcd_caps.lttpr_caps.phy_repeater_cnt); for (repeater_id = repeater_cnt; (repeater_id > 0 && status == LINK_TRAINING_SUCCESS); repeater_id--) { |