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drm/amd/display: move dp link training logic to link_dp_training

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[why]
Extract dp link training logic out to their own files.
link_dp_training - high level training sequence and helper functions.
link_dp_training_8b_10b - dp1.x training
link_dp_training_auxless - aux-less training
link_dp_traininig_dpia - dpia training
link_dp_training_fixed_vs_pe_retimer - fixed vs pe retimer training
link_dp_training_128b_132b - dp2.1 training

Tested-by: Daniel Wheeler <Daniel.Wheeler@amd.com>
Reviewed-by: Wesley Chalmers <Wesley.Chalmers@amd.com>
Acked-by: Rodrigo Siqueira <Rodrigo.Siqueira@amd.com>
Signed-off-by: Wenjing Liu <wenjing.liu@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Wenjing Liu 2022-12-14 14:26:46 -05:00 committed by Alex Deucher
parent 899dd5b835
commit 630168a973
22 changed files with 4545 additions and 4119 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

1
drivers/gpu/drm/amd/display/dc/core/dc_link.c
View File

@ -54,6 +54,7 @@
#include "link/link_dpcd.h"
#include "link/link_dp_trace.h"
#include "link/link_hpd.h"
#include "link/link_dp_training.h"
#include "dc/dcn30/dcn30_vpg.h"

3033
drivers/gpu/drm/amd/display/dc/core/dc_link_dp.c
View File

File diff suppressed because it is too large Load Diff

3
drivers/gpu/drm/amd/display/dc/dc_dp_types.h
View File

@ -975,6 +975,9 @@ struct dpcd_usb4_dp_tunneling_info {
/* TODO - Use DRM header to replace above once available */
#endif // DP_INTRA_HOP_AUX_REPLY_INDICATION
#ifndef DP_REPEATER_CONFIGURATION_AND_STATUS_SIZE
#define DP_REPEATER_CONFIGURATION_AND_STATUS_SIZE 0x50
#endif
union dp_main_line_channel_coding_cap {
struct {
uint8_t DP_8b_10b_SUPPORTED :1;

24
drivers/gpu/drm/amd/display/dc/dc_link.h
View File

@ -459,27 +459,6 @@ void dc_link_dp_set_drive_settings(
const struct link_resource *link_res,
struct link_training_settings *lt_settings);
bool dc_link_dp_perform_link_training_skip_aux(
struct dc_link *link,
const struct link_resource *link_res,
const struct dc_link_settings *link_setting);
enum link_training_result dc_link_dp_perform_link_training(
struct dc_link *link,
const struct link_resource *link_res,
const struct dc_link_settings *link_settings,
bool skip_video_pattern);
bool dc_link_dp_sync_lt_begin(struct dc_link *link);
enum link_training_result dc_link_dp_sync_lt_attempt(
struct dc_link *link,
const struct link_resource *link_res,
struct dc_link_settings *link_setting,
struct dc_link_training_overrides *lt_settings);
bool dc_link_dp_sync_lt_end(struct dc_link *link, bool link_down);
bool dc_link_dp_set_test_pattern(
struct dc_link *link,
enum dp_test_pattern test_pattern,
@ -601,4 +580,7 @@ bool reset_cur_dp_mst_topology(struct dc_link *link);
int dc_link_aux_transfer_raw(struct ddc_service *ddc,
struct aux_payload *payload,
enum aux_return_code_type *operation_result);
enum lttpr_mode dc_link_decide_lttpr_mode(struct dc_link *link,
struct dc_link_settings *link_setting);
#endif /* DC_LINK_H_ */

114
drivers/gpu/drm/amd/display/dc/inc/dc_link_dp.h
View File

@ -31,7 +31,6 @@
#define LINK_AUX_DEFAULT_LTTPR_TIMEOUT_PERIOD 3200 /*us*/
#define LINK_AUX_DEFAULT_TIMEOUT_PERIOD 552 /*us*/
#define MAX_MTP_SLOT_COUNT 64
#define DP_REPEATER_CONFIGURATION_AND_STATUS_SIZE 0x50
#define TRAINING_AUX_RD_INTERVAL 100 //us
#define LINK_AUX_WAKE_TIMEOUT_MS 1500 // Timeout when trying to wake unresponsive DPRX.
@ -40,11 +39,6 @@ struct dc_stream_state;
struct dc_link_settings;
enum {
LINK_TRAINING_MAX_RETRY_COUNT = 5,
/* to avoid infinite loop where-in the receiver
* switches between different VS
*/
LINK_TRAINING_MAX_CR_RETRY = 100,
/*
* Some receivers fail to train on first try and are good
* on subsequent tries. 2 retries should be plenty. If we
@ -74,17 +68,8 @@ bool decide_link_settings(
struct dc_stream_state *stream,
struct dc_link_settings *link_setting);
bool perform_link_training_with_retries(
const struct dc_link_settings *link_setting,
bool skip_video_pattern,
int attempts,
struct pipe_ctx *pipe_ctx,
enum signal_type signal,
bool do_fallback);
bool hpd_rx_irq_check_link_loss_status(
struct dc_link *link,
union hpd_irq_data *hpd_irq_dpcd_data);
bool hpd_rx_irq_check_link_loss_status(struct dc_link *link,
union hpd_irq_data *hpd_irq_dpcd_data);
bool is_mst_supported(struct dc_link *link);
@ -109,63 +94,6 @@ void dpcd_set_source_specific_data(struct dc_link *link);
void dpcd_write_cable_id_to_dprx(struct dc_link *link);
/* Write DPCD link configuration data. */
enum dc_status dpcd_set_link_settings(
struct dc_link *link,
const struct link_training_settings *lt_settings);
/* Write DPCD drive settings. */
enum dc_status dpcd_set_lane_settings(
struct dc_link *link,
const struct link_training_settings *link_training_setting,
uint32_t offset);
/* Read training status and adjustment requests from DPCD. */
enum dc_status dp_get_lane_status_and_lane_adjust(
struct dc_link *link,
const struct link_training_settings *link_training_setting,
union lane_status ln_status[LANE_COUNT_DP_MAX],
union lane_align_status_updated *ln_align,
union lane_adjust ln_adjust[LANE_COUNT_DP_MAX],
uint32_t offset);
void dp_wait_for_training_aux_rd_interval(
struct dc_link *link,
uint32_t wait_in_micro_secs);
bool dp_is_cr_done(enum dc_lane_count ln_count,
union lane_status *dpcd_lane_status);
enum link_training_result dp_get_cr_failure(enum dc_lane_count ln_count,
union lane_status *dpcd_lane_status);
bool dp_is_ch_eq_done(enum dc_lane_count ln_count,
union lane_status *dpcd_lane_status);
bool dp_is_symbol_locked(enum dc_lane_count ln_count,
union lane_status *dpcd_lane_status);
bool dp_is_interlane_aligned(union lane_align_status_updated align_status);
bool dp_is_max_vs_reached(
const struct link_training_settings *lt_settings);
void dp_hw_to_dpcd_lane_settings(
const struct link_training_settings *lt_settings,
const struct dc_lane_settings hw_lane_settings[LANE_COUNT_DP_MAX],
union dpcd_training_lane dpcd_lane_settings[]);
void dp_decide_lane_settings(
const struct link_training_settings *lt_settings,
const union lane_adjust ln_adjust[LANE_COUNT_DP_MAX],
struct dc_lane_settings hw_lane_settings[LANE_COUNT_DP_MAX],
union dpcd_training_lane dpcd_lane_settings[]);
uint32_t dp_translate_training_aux_read_interval(uint32_t dpcd_aux_read_interval);
enum dpcd_training_patterns
dc_dp_training_pattern_to_dpcd_training_pattern(
struct dc_link *link,
enum dc_dp_training_pattern pattern);
uint8_t dc_dp_initialize_scrambling_data_symbols(
struct dc_link *link,
enum dc_dp_training_pattern pattern);
enum dc_status dp_set_fec_ready(struct dc_link *link, const struct link_resource *link_res, bool ready);
void dp_set_fec_enable(struct dc_link *link, bool enable);
bool dp_set_dsc_enable(struct pipe_ctx *pipe_ctx, bool enable);
@ -183,32 +111,15 @@ void dp_decide_training_settings(
/* Convert PHY repeater count read from DPCD uint8_t. */
uint8_t dp_convert_to_count(uint8_t lttpr_repeater_count);
/* Check DPCD training status registers to detect link loss. */
enum link_training_result dp_check_link_loss_status(
struct dc_link *link,
const struct link_training_settings *link_training_setting);
enum dc_status dpcd_configure_lttpr_mode(
struct dc_link *link,
struct link_training_settings *lt_settings);
enum dp_link_encoding dp_get_link_encoding_format(const struct dc_link_settings *link_settings);
enum dc_status dp_retrieve_lttpr_cap(struct dc_link *link);
bool dp_is_lttpr_present(struct dc_link *link);
enum lttpr_mode dp_decide_lttpr_mode(struct dc_link *link, struct dc_link_settings *link_setting);
void dp_get_lttpr_mode_override(struct dc_link *link, enum lttpr_mode *override);
enum lttpr_mode dp_decide_8b_10b_lttpr_mode(struct dc_link *link);
enum lttpr_mode dp_decide_128b_132b_lttpr_mode(struct dc_link *link);
bool dpcd_write_128b_132b_sst_payload_allocation_table(
const struct dc_stream_state *stream,
struct dc_link *link,
struct link_mst_stream_allocation_table *proposed_table,
bool allocate);
enum dc_status dpcd_configure_channel_coding(
struct dc_link *link,
struct link_training_settings *lt_settings);
bool dpcd_poll_for_allocation_change_trigger(struct dc_link *link);
struct fixed31_32 calculate_sst_avg_time_slots_per_mtp(
@ -220,7 +131,6 @@ void enable_dp_hpo_output(struct dc_link *link,
void disable_dp_hpo_output(struct dc_link *link,
const struct link_resource *link_res,
enum signal_type signal);
void setup_dp_hpo_stream(struct pipe_ctx *pipe_ctx, bool enable);
bool is_dp_128b_132b_signal(struct pipe_ctx *pipe_ctx);
void edp_panel_backlight_power_on(struct dc_link *link, bool wait_for_hpd);
@ -242,26 +152,20 @@ void dp_disable_link_phy(struct dc_link *link, const struct link_resource *link_
void dp_disable_link_phy_mst(struct dc_link *link, const struct link_resource *link_res,
enum signal_type signal);
bool dp_set_hw_training_pattern(
struct dc_link *link,
const struct link_resource *link_res,
enum dc_dp_training_pattern pattern,
uint32_t offset);
void dp_set_hw_lane_settings(
struct dc_link *link,
const struct link_resource *link_res,
const struct link_training_settings *link_settings,
uint32_t offset);
void dp_set_hw_test_pattern(
struct dc_link *link,
const struct link_resource *link_res,
enum dp_test_pattern test_pattern,
uint8_t *custom_pattern,
uint32_t custom_pattern_size);
void dp_retrain_link_dp_test(struct dc_link *link,
struct dc_link_settings *link_setting,
bool skip_video_pattern);
bool decide_fallback_link_setting(
struct dc_link *link,
struct dc_link_settings *max,
struct dc_link_settings *cur,
enum link_training_result training_result);
#endif /* __DC_LINK_DP_H__ */

4
drivers/gpu/drm/amd/display/dc/link/Makefile
View File

@ -24,7 +24,9 @@
# PHY, HPD, DDC and etc).
LINK = link_hwss_dio.o link_hwss_dpia.o link_hwss_hpo_dp.o link_dp_trace.o \
link_hpd.o link_ddc.o link_dpcd.o link_dp_dpia.o
link_hpd.o link_ddc.o link_dpcd.o link_dp_dpia.o link_dp_training.o \
link_dp_training_8b_10b.o link_dp_training_128b_132b.o link_dp_training_dpia.o \
link_dp_training_auxless.o link_dp_training_fixed_vs_pe_retimer.o
AMD_DAL_LINK = $(addprefix $(AMDDALPATH)/dc/link/,$(LINK))

945
drivers/gpu/drm/amd/display/dc/link/link_dp_dpia.c
View File

@ -34,12 +34,20 @@
#include "link_hwss.h"
#include "dm_helpers.h"
#include "dmub/inc/dmub_cmd.h"
#include "link/link_dpcd.h"
#include "link_dpcd.h"
#include "link_dp_training.h"
#include "dc_dmub_srv.h"
#define DC_LOGGER \
link->ctx->logger
/** @note Can remove once DP tunneling registers in upstream include/drm/drm_dp_helper.h */
/* DPCD DP Tunneling over USB4 */
#define DP_TUNNELING_CAPABILITIES_SUPPORT 0xe000d
#define DP_IN_ADAPTER_INFO 0xe000e
#define DP_USB4_DRIVER_ID 0xe000f
#define DP_USB4_ROUTER_TOPOLOGY_ID 0xe001b
enum dc_status dpcd_get_tunneling_device_data(struct dc_link *link)
{
enum dc_status status = DC_OK;
@ -47,19 +55,20 @@ enum dc_status dpcd_get_tunneling_device_data(struct dc_link *link)
uint8_t dpcd_topology_data[DPCD_USB4_TOPOLOGY_ID_LEN] = {0};
uint8_t i = 0;
status = core_link_read_dpcd(link,
status = core_link_read_dpcd(
link,
DP_TUNNELING_CAPABILITIES_SUPPORT,
dpcd_dp_tun_data,
sizeof(dpcd_dp_tun_data));
status = core_link_read_dpcd(link,
status = core_link_read_dpcd(
link,
DP_USB4_ROUTER_TOPOLOGY_ID,
dpcd_topology_data,
sizeof(dpcd_topology_data));
link->dpcd_caps.usb4_dp_tun_info.dp_tun_cap.raw =
dpcd_dp_tun_data[DP_TUNNELING_CAPABILITIES_SUPPORT -
DP_TUNNELING_CAPABILITIES_SUPPORT];
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 =
@ -96,929 +105,3 @@ bool dc_link_dpia_query_hpd_status(struct dc_link *link)
return is_hpd_high;
}
/* Configure link as prescribed in link_setting; set LTTPR mode; and
* Initialize link training settings.
* Abort link training if sink unplug detected.
*
* @param link DPIA link being trained.
* @param[in] link_setting Lane count, link rate and downspread control.
* @param[out] lt_settings Link settings and drive settings (voltage swing and pre-emphasis).
*/
static enum link_training_result dpia_configure_link(
struct dc_link *link,
const struct link_resource *link_res,
const struct dc_link_settings *link_setting,
struct link_training_settings *lt_settings)
{
enum dc_status status;
bool fec_enable;
DC_LOG_HW_LINK_TRAINING("%s\n DPIA(%d) configuring\n - LTTPR mode(%d)\n",
__func__,
link->link_id.enum_id - ENUM_ID_1,
lt_settings->lttpr_mode);
dp_decide_training_settings(link,
link_setting,
lt_settings);
dp_get_lttpr_mode_override(link, &lt_settings->lttpr_mode);
status = dpcd_configure_channel_coding(link, lt_settings);
if (status != DC_OK && link->is_hpd_pending)
return LINK_TRAINING_ABORT;
/* Configure lttpr mode */
status = dpcd_configure_lttpr_mode(link, lt_settings);
if (status != DC_OK && link->is_hpd_pending)
return LINK_TRAINING_ABORT;
/* Set link rate, lane count and spread. */
status = dpcd_set_link_settings(link, lt_settings);
if (status != DC_OK && link->is_hpd_pending)
return LINK_TRAINING_ABORT;
if (link->preferred_training_settings.fec_enable)
fec_enable = *link->preferred_training_settings.fec_enable;
else
fec_enable = true;
status = dp_set_fec_ready(link, link_res, fec_enable);
if (status != DC_OK && link->is_hpd_pending)
return LINK_TRAINING_ABORT;
return LINK_TRAINING_SUCCESS;
}
static enum dc_status core_link_send_set_config(struct dc_link *link,
uint8_t msg_type,
uint8_t msg_data)
{
struct set_config_cmd_payload payload;
enum set_config_status set_config_result = SET_CONFIG_PENDING;
/* prepare set_config payload */
payload.msg_type = msg_type;
payload.msg_data = msg_data;
if (!link->ddc->ddc_pin && !link->aux_access_disabled &&
(dm_helpers_dmub_set_config_sync(link->ctx, link,
&payload, &set_config_result) == -1)) {
return DC_ERROR_UNEXPECTED;
}
/* set_config should return ACK if successful */
return (set_config_result == SET_CONFIG_ACK_RECEIVED) ? DC_OK : DC_ERROR_UNEXPECTED;
}
/* Build SET_CONFIG message data payload for specified message type. */
static uint8_t dpia_build_set_config_data(enum dpia_set_config_type type,
struct dc_link *link,
struct link_training_settings *lt_settings)
{
union dpia_set_config_data data;
data.raw = 0;
switch (type) {
case DPIA_SET_CFG_SET_LINK:
data.set_link.mode = lt_settings->lttpr_mode == LTTPR_MODE_NON_TRANSPARENT ? 1 : 0;
break;
case DPIA_SET_CFG_SET_PHY_TEST_MODE:
break;
case DPIA_SET_CFG_SET_VSPE:
/* Assume all lanes have same drive settings. */
data.set_vspe.swing = lt_settings->hw_lane_settings[0].VOLTAGE_SWING;
data.set_vspe.pre_emph = lt_settings->hw_lane_settings[0].PRE_EMPHASIS;
data.set_vspe.max_swing_reached =
lt_settings->hw_lane_settings[0].VOLTAGE_SWING ==
VOLTAGE_SWING_MAX_LEVEL ? 1 : 0;
data.set_vspe.max_pre_emph_reached =
lt_settings->hw_lane_settings[0].PRE_EMPHASIS ==
PRE_EMPHASIS_MAX_LEVEL ? 1 : 0;
break;
default:
ASSERT(false); /* Message type not supported by helper function. */
break;
}
return data.raw;
}
/* Convert DC training pattern to DPIA training stage. */
static enum dc_status convert_trng_ptn_to_trng_stg(enum dc_dp_training_pattern tps, enum dpia_set_config_ts *ts)
{
enum dc_status status = DC_OK;
switch (tps) {
case DP_TRAINING_PATTERN_SEQUENCE_1:
*ts = DPIA_TS_TPS1;
break;
case DP_TRAINING_PATTERN_SEQUENCE_2:
*ts = DPIA_TS_TPS2;
break;
case DP_TRAINING_PATTERN_SEQUENCE_3:
*ts = DPIA_TS_TPS3;
break;
case DP_TRAINING_PATTERN_SEQUENCE_4:
*ts = DPIA_TS_TPS4;
break;
case DP_TRAINING_PATTERN_VIDEOIDLE:
*ts = DPIA_TS_DPRX_DONE;
break;
default: /* TPS not supported by helper function. */
ASSERT(false);
*ts = DPIA_TS_DPRX_DONE;
status = DC_UNSUPPORTED_VALUE;
break;
}
return status;
}
/* Write training pattern to DPCD. */
static enum dc_status dpcd_set_lt_pattern(struct dc_link *link,
enum dc_dp_training_pattern pattern,
uint32_t hop)
{
union dpcd_training_pattern dpcd_pattern = {0};
uint32_t dpcd_tps_offset = DP_TRAINING_PATTERN_SET;
enum dc_status status;
if (hop != DPRX)
dpcd_tps_offset = DP_TRAINING_PATTERN_SET_PHY_REPEATER1 +
((DP_REPEATER_CONFIGURATION_AND_STATUS_SIZE) * (hop - 1));
/* DpcdAddress_TrainingPatternSet */
dpcd_pattern.v1_4.TRAINING_PATTERN_SET =
dc_dp_training_pattern_to_dpcd_training_pattern(link, pattern);
dpcd_pattern.v1_4.SCRAMBLING_DISABLE =
dc_dp_initialize_scrambling_data_symbols(link, pattern);
if (hop != DPRX) {
DC_LOG_HW_LINK_TRAINING("%s\n LTTPR Repeater ID: %d\n 0x%X pattern = %x\n",
__func__,
hop,
dpcd_tps_offset,
dpcd_pattern.v1_4.TRAINING_PATTERN_SET);
} else {
DC_LOG_HW_LINK_TRAINING("%s\n 0x%X pattern = %x\n",
__func__,
dpcd_tps_offset,
dpcd_pattern.v1_4.TRAINING_PATTERN_SET);
}
status = core_link_write_dpcd(link,
dpcd_tps_offset,
&dpcd_pattern.raw,
sizeof(dpcd_pattern.raw));
return status;
}
/* Execute clock recovery phase of link training for specified hop in display
* path.in non-transparent mode:
* - Driver issues both DPCD and SET_CONFIG transactions.
* - TPS1 is transmitted for any hops downstream of DPOA.
* - Drive (VS/PE) only transmitted for the hop immediately downstream of DPOA.
* - CR for the first hop (DPTX-to-DPIA) is assumed to be successful.
*
* @param link DPIA link being trained.
* @param lt_settings link_setting and drive settings (voltage swing and pre-emphasis).
* @param hop The Hop in display path. DPRX = 0.
*/
static enum link_training_result dpia_training_cr_non_transparent(
struct dc_link *link,
const struct link_resource *link_res,
struct link_training_settings *lt_settings,
uint32_t hop)
{
enum link_training_result result = LINK_TRAINING_CR_FAIL_LANE0;
uint8_t repeater_cnt = 0; /* Number of hops/repeaters in display path. */
enum dc_status status;
uint32_t retries_cr = 0; /* Number of consecutive attempts with same VS or PE. */
uint32_t retry_count = 0;
/* From DP spec, CR read interval is always 100us. */
uint32_t wait_time_microsec = TRAINING_AUX_RD_INTERVAL;
enum dc_lane_count lane_count = lt_settings->link_settings.lane_count;
union lane_status dpcd_lane_status[LANE_COUNT_DP_MAX] = {0};
union lane_align_status_updated dpcd_lane_status_updated = {0};
union lane_adjust dpcd_lane_adjust[LANE_COUNT_DP_MAX] = {0};
uint8_t set_cfg_data;
enum dpia_set_config_ts ts;
repeater_cnt = dp_convert_to_count(link->dpcd_caps.lttpr_caps.phy_repeater_cnt);
/* Cap of LINK_TRAINING_MAX_CR_RETRY attempts at clock recovery.
* Fix inherited from perform_clock_recovery_sequence() -
* the DP equivalent of this function:
* Required for Synaptics MST hub which can put the LT in
* infinite loop by switching the VS between level 0 and level 1
* continuously.
*/
while ((retries_cr < LINK_TRAINING_MAX_RETRY_COUNT) &&
(retry_count < LINK_TRAINING_MAX_CR_RETRY)) {
/* DPTX-to-DPIA */
if (hop == repeater_cnt) {
/* Send SET_CONFIG(SET_LINK:LC,LR,LTTPR) to notify DPOA that
* non-transparent link training has started.
* This also enables the transmission of clk_sync packets.
*/
set_cfg_data = dpia_build_set_config_data(DPIA_SET_CFG_SET_LINK,
link,
lt_settings);
status = core_link_send_set_config(link,
DPIA_SET_CFG_SET_LINK,
set_cfg_data);
/* CR for this hop is considered successful as long as
* SET_CONFIG message is acknowledged by DPOA.
*/
if (status == DC_OK)
result = LINK_TRAINING_SUCCESS;
else
result = LINK_TRAINING_ABORT;
break;
}
/* DPOA-to-x */
/* Instruct DPOA to transmit TPS1 then update DPCD. */
if (retry_count == 0) {
status = convert_trng_ptn_to_trng_stg(lt_settings->pattern_for_cr, &ts);
if (status != DC_OK) {
result = LINK_TRAINING_ABORT;
break;
}
status = dpcd_set_lt_pattern(link, lt_settings->pattern_for_cr, hop);
if (status != DC_OK) {
result = LINK_TRAINING_ABORT;
break;
}
}
/* Update DPOA drive settings then DPCD. DPOA does only adjusts
* drive settings for hops immediately downstream.
*/
if (hop == repeater_cnt - 1) {
set_cfg_data = dpia_build_set_config_data(DPIA_SET_CFG_SET_VSPE,
link,
lt_settings);
status = core_link_send_set_config(link,
DPIA_SET_CFG_SET_VSPE,
set_cfg_data);
if (status != DC_OK) {
result = LINK_TRAINING_ABORT;
break;
}
}
status = dpcd_set_lane_settings(link, lt_settings, hop);
if (status != DC_OK) {
result = LINK_TRAINING_ABORT;
break;
}
dp_wait_for_training_aux_rd_interval(link, wait_time_microsec);
/* Read status and adjustment requests from DPCD. */
status = dp_get_lane_status_and_lane_adjust(
link,
lt_settings,
dpcd_lane_status,
&dpcd_lane_status_updated,
dpcd_lane_adjust,
hop);
if (status != DC_OK) {
result = LINK_TRAINING_ABORT;
break;
}
/* Check if clock recovery successful. */
if (dp_is_cr_done(lane_count, dpcd_lane_status)) {
result = LINK_TRAINING_SUCCESS;
break;
}
result = dp_get_cr_failure(lane_count, dpcd_lane_status);
if (dp_is_max_vs_reached(lt_settings))
break;
/* Count number of attempts with same drive settings.
* Note: settings are the same for all lanes,
* so comparing first lane is sufficient.
*/
if ((lt_settings->dpcd_lane_settings[0].bits.VOLTAGE_SWING_SET ==
dpcd_lane_adjust[0].bits.VOLTAGE_SWING_LANE)
&& (lt_settings->dpcd_lane_settings[0].bits.PRE_EMPHASIS_SET ==
dpcd_lane_adjust[0].bits.PRE_EMPHASIS_LANE))
retries_cr++;
else
retries_cr = 0;
/* Update VS/PE. */
dp_decide_lane_settings(lt_settings, dpcd_lane_adjust,
lt_settings->hw_lane_settings,
lt_settings->dpcd_lane_settings);
retry_count++;
}
/* Abort link training if clock recovery failed due to HPD unplug. */
if (link->is_hpd_pending)
result = LINK_TRAINING_ABORT;
DC_LOG_HW_LINK_TRAINING(
"%s\n DPIA(%d) clock recovery\n -hop(%d)\n - result(%d)\n - retries(%d)\n - status(%d)\n",
__func__,
link->link_id.enum_id - ENUM_ID_1,
hop,
result,
retry_count,
status);
return result;
}
/* Execute clock recovery phase of link training in transparent LTTPR mode:
* - Driver only issues DPCD transactions and leaves USB4 tunneling (SET_CONFIG) messages to DPIA.
* - Driver writes TPS1 to DPCD to kick off training.
* - Clock recovery (CR) for link is handled by DPOA, which reports result to DPIA on completion.
* - DPIA communicates result to driver by updating CR status when driver reads DPCD.
*
* @param link DPIA link being trained.
* @param lt_settings link_setting and drive settings (voltage swing and pre-emphasis).
*/
static enum link_training_result dpia_training_cr_transparent(
struct dc_link *link,
const struct link_resource *link_res,
struct link_training_settings *lt_settings)
{
enum link_training_result result = LINK_TRAINING_CR_FAIL_LANE0;
enum dc_status status;
uint32_t retries_cr = 0; /* Number of consecutive attempts with same VS or PE. */
uint32_t retry_count = 0;
uint32_t wait_time_microsec = lt_settings->cr_pattern_time;
enum dc_lane_count lane_count = lt_settings->link_settings.lane_count;
union lane_status dpcd_lane_status[LANE_COUNT_DP_MAX] = {0};
union lane_align_status_updated dpcd_lane_status_updated = {0};
union lane_adjust dpcd_lane_adjust[LANE_COUNT_DP_MAX] = {0};
/* Cap of LINK_TRAINING_MAX_CR_RETRY attempts at clock recovery.
* Fix inherited from perform_clock_recovery_sequence() -
* the DP equivalent of this function:
* Required for Synaptics MST hub which can put the LT in
* infinite loop by switching the VS between level 0 and level 1
* continuously.
*/
while ((retries_cr < LINK_TRAINING_MAX_RETRY_COUNT) &&
(retry_count < LINK_TRAINING_MAX_CR_RETRY)) {
/* Write TPS1 (not VS or PE) to DPCD to start CR phase.
* DPIA sends SET_CONFIG(SET_LINK) to notify DPOA to
* start link training.
*/
if (retry_count == 0) {
status = dpcd_set_lt_pattern(link, lt_settings->pattern_for_cr, DPRX);
if (status != DC_OK) {
result = LINK_TRAINING_ABORT;
break;
}
}
dp_wait_for_training_aux_rd_interval(link, wait_time_microsec);
/* Read status and adjustment requests from DPCD. */
status = dp_get_lane_status_and_lane_adjust(
link,
lt_settings,
dpcd_lane_status,
&dpcd_lane_status_updated,
dpcd_lane_adjust,
DPRX);
if (status != DC_OK) {
result = LINK_TRAINING_ABORT;
break;
}
/* Check if clock recovery successful. */
if (dp_is_cr_done(lane_count, dpcd_lane_status)) {
result = LINK_TRAINING_SUCCESS;
break;
}
result = dp_get_cr_failure(lane_count, dpcd_lane_status);
if (dp_is_max_vs_reached(lt_settings))
break;
/* Count number of attempts with same drive settings.
* Note: settings are the same for all lanes,
* so comparing first lane is sufficient.
*/
if ((lt_settings->dpcd_lane_settings[0].bits.VOLTAGE_SWING_SET ==
dpcd_lane_adjust[0].bits.VOLTAGE_SWING_LANE)
&& (lt_settings->dpcd_lane_settings[0].bits.PRE_EMPHASIS_SET ==
dpcd_lane_adjust[0].bits.PRE_EMPHASIS_LANE))
retries_cr++;
else
retries_cr = 0;
/* Update VS/PE. */
dp_decide_lane_settings(lt_settings, dpcd_lane_adjust,
lt_settings->hw_lane_settings, lt_settings->dpcd_lane_settings);
retry_count++;
}
/* Abort link training if clock recovery failed due to HPD unplug. */
if (link->is_hpd_pending)
result = LINK_TRAINING_ABORT;
DC_LOG_HW_LINK_TRAINING("%s\n DPIA(%d) clock recovery\n"
" -hop(%d)\n - result(%d)\n - retries(%d)\n",
__func__,
link->link_id.enum_id - ENUM_ID_1,
DPRX,
result,
retry_count);
return result;
}
/* Execute clock recovery phase of link training for specified hop in display
* path.
*
* @param link DPIA link being trained.
* @param lt_settings link_setting and drive settings (voltage swing and pre-emphasis).
* @param hop The Hop in display path. DPRX = 0.
*/
static enum link_training_result dpia_training_cr_phase(
struct dc_link *link,
const struct link_resource *link_res,
struct link_training_settings *lt_settings,
uint32_t hop)
{
enum link_training_result result = LINK_TRAINING_CR_FAIL_LANE0;
if (lt_settings->lttpr_mode == LTTPR_MODE_NON_TRANSPARENT)
result = dpia_training_cr_non_transparent(link, link_res, lt_settings, hop);
else
result = dpia_training_cr_transparent(link, link_res, lt_settings);
return result;
}
/* Return status read interval during equalization phase. */
static uint32_t dpia_get_eq_aux_rd_interval(const struct dc_link *link,
const struct link_training_settings *lt_settings,
uint32_t hop)
{
uint32_t wait_time_microsec;
if (hop == DPRX)
wait_time_microsec = lt_settings->eq_pattern_time;
else
wait_time_microsec =
dp_translate_training_aux_read_interval(
link->dpcd_caps.lttpr_caps.aux_rd_interval[hop - 1]);
/* Check debug option for extending aux read interval. */
if (link->dc->debug.dpia_debug.bits.extend_aux_rd_interval)
wait_time_microsec = DPIA_DEBUG_EXTENDED_AUX_RD_INTERVAL_US;
return wait_time_microsec;
}
/* Execute equalization phase of link training for specified hop in display
* path in non-transparent mode:
* - driver issues both DPCD and SET_CONFIG transactions.
* - TPSx is transmitted for any hops downstream of DPOA.
* - Drive (VS/PE) only transmitted for the hop immediately downstream of DPOA.
* - EQ for the first hop (DPTX-to-DPIA) is assumed to be successful.
* - DPRX EQ only reported successful when both DPRX and DPIA requirements
* (clk sync packets sent) fulfilled.
*
* @param link DPIA link being trained.
* @param lt_settings link_setting and drive settings (voltage swing and pre-emphasis).
* @param hop The Hop in display path. DPRX = 0.
*/
static enum link_training_result dpia_training_eq_non_transparent(
struct dc_link *link,
const struct link_resource *link_res,
struct link_training_settings *lt_settings,
uint32_t hop)
{
enum link_training_result result = LINK_TRAINING_EQ_FAIL_EQ;
uint8_t repeater_cnt = 0; /* Number of hops/repeaters in display path. */
uint32_t retries_eq = 0;
enum dc_status status;
enum dc_dp_training_pattern tr_pattern;
uint32_t wait_time_microsec;
enum dc_lane_count lane_count = lt_settings->link_settings.lane_count;
union lane_align_status_updated dpcd_lane_status_updated = {0};
union lane_status dpcd_lane_status[LANE_COUNT_DP_MAX] = {0};
union lane_adjust dpcd_lane_adjust[LANE_COUNT_DP_MAX] = {0};
uint8_t set_cfg_data;
enum dpia_set_config_ts ts;
/* Training pattern is TPS4 for repeater;
* TPS2/3/4 for DPRX depending on what it supports.
*/
if (hop == DPRX)
tr_pattern = lt_settings->pattern_for_eq;
else
tr_pattern = DP_TRAINING_PATTERN_SEQUENCE_4;
repeater_cnt = dp_convert_to_count(link->dpcd_caps.lttpr_caps.phy_repeater_cnt);
for (retries_eq = 0; retries_eq < LINK_TRAINING_MAX_RETRY_COUNT; retries_eq++) {
/* DPTX-to-DPIA equalization always successful. */
if (hop == repeater_cnt) {
result = LINK_TRAINING_SUCCESS;
break;
}
/* Instruct DPOA to transmit TPSn then update DPCD. */
if (retries_eq == 0) {
status = convert_trng_ptn_to_trng_stg(tr_pattern, &ts);
if (status != DC_OK) {
result = LINK_TRAINING_ABORT;
break;
}
status = core_link_send_set_config(link,
DPIA_SET_CFG_SET_TRAINING,
ts);
if (status != DC_OK) {
result = LINK_TRAINING_ABORT;
break;
}
status = dpcd_set_lt_pattern(link, tr_pattern, hop);
if (status != DC_OK) {
result = LINK_TRAINING_ABORT;
break;
}
}
/* Update DPOA drive settings then DPCD. DPOA only adjusts
* drive settings for hop immediately downstream.
*/
if (hop == repeater_cnt - 1) {
set_cfg_data = dpia_build_set_config_data(DPIA_SET_CFG_SET_VSPE,
link,
lt_settings);
status = core_link_send_set_config(link,
DPIA_SET_CFG_SET_VSPE,
set_cfg_data);
if (status != DC_OK) {
result = LINK_TRAINING_ABORT;
break;
}
}
status = dpcd_set_lane_settings(link, lt_settings, hop);
if (status != DC_OK) {
result = LINK_TRAINING_ABORT;
break;
}
/* Extend wait time on second equalisation attempt on final hop to
* ensure clock sync packets have been sent.
*/
if (hop == DPRX && retries_eq == 1)
wait_time_microsec = max(wait_time_microsec, (uint32_t)DPIA_CLK_SYNC_DELAY);
else
wait_time_microsec = dpia_get_eq_aux_rd_interval(link, lt_settings, hop);
dp_wait_for_training_aux_rd_interval(link, wait_time_microsec);
/* Read status and adjustment requests from DPCD. */
status = dp_get_lane_status_and_lane_adjust(
link,
lt_settings,
dpcd_lane_status,
&dpcd_lane_status_updated,
dpcd_lane_adjust,
hop);
if (status != DC_OK) {
result = LINK_TRAINING_ABORT;
break;
}
/* CR can still fail during EQ phase. Fail training if CR fails. */
if (!dp_is_cr_done(lane_count, dpcd_lane_status)) {
result = LINK_TRAINING_EQ_FAIL_CR;
break;
}
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;
}
/* Update VS/PE. */
dp_decide_lane_settings(lt_settings, dpcd_lane_adjust,
lt_settings->hw_lane_settings, lt_settings->dpcd_lane_settings);
}
/* Abort link training if equalization failed due to HPD unplug. */
if (link->is_hpd_pending)
result = LINK_TRAINING_ABORT;
DC_LOG_HW_LINK_TRAINING(
"%s\n DPIA(%d) equalization\n - hop(%d)\n - result(%d)\n - retries(%d)\n - status(%d)\n",
__func__,
link->link_id.enum_id - ENUM_ID_1,
hop,
result,
retries_eq,
status);
return result;
}
/* Execute equalization phase of link training for specified hop in display
* path in transparent LTTPR mode:
* - driver only issues DPCD transactions leaves USB4 tunneling (SET_CONFIG) messages to DPIA.
* - driver writes TPSx to DPCD to notify DPIA that is in equalization phase.
* - equalization (EQ) for link is handled by DPOA, which reports result to DPIA on completion.
* - DPIA communicates result to driver by updating EQ status when driver reads DPCD.
*
* @param link DPIA link being trained.
* @param lt_settings link_setting and drive settings (voltage swing and pre-emphasis).
* @param hop The Hop in display path. DPRX = 0.
*/
static enum link_training_result dpia_training_eq_transparent(
struct dc_link *link,
const struct link_resource *link_res,
struct link_training_settings *lt_settings)
{
enum link_training_result result = LINK_TRAINING_EQ_FAIL_EQ;
uint32_t retries_eq = 0;
enum dc_status status;
enum dc_dp_training_pattern tr_pattern = lt_settings->pattern_for_eq;
uint32_t wait_time_microsec;
enum dc_lane_count lane_count = lt_settings->link_settings.lane_count;
union lane_align_status_updated dpcd_lane_status_updated = {0};
union lane_status dpcd_lane_status[LANE_COUNT_DP_MAX] = {0};
union lane_adjust dpcd_lane_adjust[LANE_COUNT_DP_MAX] = {0};
wait_time_microsec = dpia_get_eq_aux_rd_interval(link, lt_settings, DPRX);
for (retries_eq = 0; retries_eq < LINK_TRAINING_MAX_RETRY_COUNT; retries_eq++) {
if (retries_eq == 0) {
status = dpcd_set_lt_pattern(link, tr_pattern, DPRX);
if (status != DC_OK) {
result = LINK_TRAINING_ABORT;
break;
}
}
dp_wait_for_training_aux_rd_interval(link, wait_time_microsec);
/* Read status and adjustment requests from DPCD. */
status = dp_get_lane_status_and_lane_adjust(
link,
lt_settings,
dpcd_lane_status,
&dpcd_lane_status_updated,
dpcd_lane_adjust,
DPRX);
if (status != DC_OK) {
result = LINK_TRAINING_ABORT;
break;
}
/* CR can still fail during EQ phase. Fail training if CR fails. */
if (!dp_is_cr_done(lane_count, dpcd_lane_status)) {
result = LINK_TRAINING_EQ_FAIL_CR;
break;
}
if (dp_is_ch_eq_done(lane_count, dpcd_lane_status) &&
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. */
dp_decide_lane_settings(lt_settings, dpcd_lane_adjust,
lt_settings->hw_lane_settings, lt_settings->dpcd_lane_settings);
}
/* Abort link training if equalization failed due to HPD unplug. */
if (link->is_hpd_pending)
result = LINK_TRAINING_ABORT;
DC_LOG_HW_LINK_TRAINING("%s\n DPIA(%d) equalization\n"
" - hop(%d)\n - result(%d)\n - retries(%d)\n",
__func__,
link->link_id.enum_id - ENUM_ID_1,
DPRX,
result,
retries_eq);
return result;
}
/* Execute equalization phase of link training for specified hop in display
* path.
*
* @param link DPIA link being trained.
* @param lt_settings link_setting and drive settings (voltage swing and pre-emphasis).
* @param hop The Hop in display path. DPRX = 0.
*/
static enum link_training_result dpia_training_eq_phase(
struct dc_link *link,
const struct link_resource *link_res,
struct link_training_settings *lt_settings,
uint32_t hop)
{
enum link_training_result result;
if (lt_settings->lttpr_mode == LTTPR_MODE_NON_TRANSPARENT)
result = dpia_training_eq_non_transparent(link, link_res, lt_settings, hop);
else
result = dpia_training_eq_transparent(link, link_res, lt_settings);
return result;
}
/* End training of specified hop in display path. */
static enum dc_status dpcd_clear_lt_pattern(struct dc_link *link, uint32_t hop)
{
union dpcd_training_pattern dpcd_pattern = {0};
uint32_t dpcd_tps_offset = DP_TRAINING_PATTERN_SET;
enum dc_status status;
if (hop != DPRX)
dpcd_tps_offset = DP_TRAINING_PATTERN_SET_PHY_REPEATER1 +
((DP_REPEATER_CONFIGURATION_AND_STATUS_SIZE) * (hop - 1));
status = core_link_write_dpcd(link,
dpcd_tps_offset,
&dpcd_pattern.raw,
sizeof(dpcd_pattern.raw));
return status;
}
/* End training of specified hop in display path.
*
* In transparent LTTPR mode:
* - driver clears training pattern for the specified hop in DPCD.
* In non-transparent LTTPR mode:
* - in addition to clearing training pattern, driver issues USB4 tunneling
* (SET_CONFIG) messages to notify DPOA when training is done for first hop
* (DPTX-to-DPIA) and last hop (DPRX).
*
* @param link DPIA link being trained.
* @param hop The Hop in display path. DPRX = 0.
*/
static enum link_training_result dpia_training_end(struct dc_link *link,
struct link_training_settings *lt_settings,
uint32_t hop)
{
enum link_training_result result = LINK_TRAINING_SUCCESS;
uint8_t repeater_cnt = 0; /* Number of hops/repeaters in display path. */
enum dc_status status;
if (lt_settings->lttpr_mode == LTTPR_MODE_NON_TRANSPARENT) {
repeater_cnt = dp_convert_to_count(link->dpcd_caps.lttpr_caps.phy_repeater_cnt);
if (hop == repeater_cnt) { /* DPTX-to-DPIA */
/* Send SET_CONFIG(SET_TRAINING:0xff) to notify DPOA that
* DPTX-to-DPIA hop trained. No DPCD write needed for first hop.
*/
status = core_link_send_set_config(link,
DPIA_SET_CFG_SET_TRAINING,
DPIA_TS_UFP_DONE);
if (status != DC_OK)
result = LINK_TRAINING_ABORT;
} else { /* DPOA-to-x */
/* Write 0x0 to TRAINING_PATTERN_SET */
status = dpcd_clear_lt_pattern(link, hop);
if (status != DC_OK)
result = LINK_TRAINING_ABORT;
}
/* Notify DPOA that non-transparent link training of DPRX done. */
if (hop == DPRX && result != LINK_TRAINING_ABORT) {
status = core_link_send_set_config(link,
DPIA_SET_CFG_SET_TRAINING,
DPIA_TS_DPRX_DONE);
if (status != DC_OK)
result = LINK_TRAINING_ABORT;
}
} else { /* non-LTTPR or transparent LTTPR. */
/* Write 0x0 to TRAINING_PATTERN_SET */
status = dpcd_clear_lt_pattern(link, hop);
if (status != DC_OK)
result = LINK_TRAINING_ABORT;
}
DC_LOG_HW_LINK_TRAINING("%s\n DPIA(%d) end\n - hop(%d)\n - result(%d)\n - LTTPR mode(%d)\n",
__func__,
link->link_id.enum_id - ENUM_ID_1,
hop,
result,
lt_settings->lttpr_mode);
return result;
}
/* When aborting training of specified hop in display path, clean up by:
* - Attempting to clear DPCD TRAINING_PATTERN_SET, LINK_BW_SET and LANE_COUNT_SET.
* - Sending SET_CONFIG(SET_LINK) with lane count and link rate set to 0.
*
* @param link DPIA link being trained.
* @param hop The Hop in display path. DPRX = 0.
*/
static void dpia_training_abort(struct dc_link *link,
struct link_training_settings *lt_settings,
uint32_t hop)
{
uint8_t data = 0;
uint32_t dpcd_tps_offset = DP_TRAINING_PATTERN_SET;
DC_LOG_HW_LINK_TRAINING("%s\n DPIA(%d) aborting\n - LTTPR mode(%d)\n - HPD(%d)\n",
__func__,
link->link_id.enum_id - ENUM_ID_1,
lt_settings->lttpr_mode,
link->is_hpd_pending);
/* Abandon clean-up if sink unplugged. */
if (link->is_hpd_pending)
return;
if (hop != DPRX)
dpcd_tps_offset = DP_TRAINING_PATTERN_SET_PHY_REPEATER1 +
((DP_REPEATER_CONFIGURATION_AND_STATUS_SIZE) * (hop - 1));
core_link_write_dpcd(link, dpcd_tps_offset, &data, 1);
core_link_write_dpcd(link, DP_LINK_BW_SET, &data, 1);
core_link_write_dpcd(link, DP_LANE_COUNT_SET, &data, 1);
core_link_send_set_config(link, DPIA_SET_CFG_SET_LINK, data);
}
enum link_training_result dc_link_dpia_perform_link_training(
struct dc_link *link,
const struct link_resource *link_res,
const struct dc_link_settings *link_setting,
bool skip_video_pattern)
{
enum link_training_result result;
struct link_training_settings lt_settings = {0};
uint8_t repeater_cnt = 0; /* Number of hops/repeaters in display path. */
int8_t repeater_id; /* Current hop. */
struct dc_link_settings link_settings = *link_setting; // non-const copy to pass in
lt_settings.lttpr_mode = dp_decide_lttpr_mode(link, &link_settings);
/* Configure link as prescribed in link_setting and set LTTPR mode. */
result = dpia_configure_link(link, link_res, link_setting, &lt_settings);
if (result != LINK_TRAINING_SUCCESS)
return result;
if (lt_settings.lttpr_mode == LTTPR_MODE_NON_TRANSPARENT)
repeater_cnt = dp_convert_to_count(link->dpcd_caps.lttpr_caps.phy_repeater_cnt);
/* Train each hop in turn starting with the one closest to DPTX.
* In transparent or non-LTTPR mode, train only the final hop (DPRX).
*/
for (repeater_id = repeater_cnt; repeater_id >= 0; repeater_id--) {
/* Clock recovery. */
result = dpia_training_cr_phase(link, link_res, &lt_settings, repeater_id);
if (result != LINK_TRAINING_SUCCESS)
break;
/* Equalization. */
result = dpia_training_eq_phase(link, link_res, &lt_settings, repeater_id);
if (result != LINK_TRAINING_SUCCESS)
break;
/* Stop training hop. */
result = dpia_training_end(link, &lt_settings, repeater_id);
if (result != LINK_TRAINING_SUCCESS)
break;
}
/* Double-check link status if training successful; gracefully abort
* training of current hop if training failed due to message tunneling
* failure; end training of hop if training ended conventionally and
* falling back to lower bandwidth settings possible.
*/
if (result == LINK_TRAINING_SUCCESS) {
msleep(5);
if (!link->is_automated)
result = dp_check_link_loss_status(link, &lt_settings);
} else if (result == LINK_TRAINING_ABORT) {
dpia_training_abort(link, &lt_settings, repeater_id);
} else {
dpia_training_end(link, &lt_settings, repeater_id);
}
return result;
}

60
drivers/gpu/drm/amd/display/dc/link/link_dp_dpia.h
View File

@ -28,57 +28,6 @@
#define __DC_LINK_DPIA_H__
#include "link.h"
/* This module implements functionality for training DPIA links. */
/* The approximate time (us) it takes to transmit 9 USB4 DP clock sync packets. */
#define DPIA_CLK_SYNC_DELAY 16000
/* Extend interval between training status checks for manual testing. */
#define DPIA_DEBUG_EXTENDED_AUX_RD_INTERVAL_US 60000000
/** @note Can remove once DP tunneling registers in upstream include/drm/drm_dp_helper.h */
/* DPCD DP Tunneling over USB4 */
#define DP_TUNNELING_CAPABILITIES_SUPPORT 0xe000d
#define DP_IN_ADAPTER_INFO 0xe000e
#define DP_USB4_DRIVER_ID 0xe000f
#define DP_USB4_ROUTER_TOPOLOGY_ID 0xe001b
/* SET_CONFIG message types sent by driver. */
enum dpia_set_config_type {
DPIA_SET_CFG_SET_LINK = 0x01,
DPIA_SET_CFG_SET_PHY_TEST_MODE = 0x05,
DPIA_SET_CFG_SET_TRAINING = 0x18,
DPIA_SET_CFG_SET_VSPE = 0x19
};
/* Training stages (TS) in SET_CONFIG(SET_TRAINING) message. */
enum dpia_set_config_ts {
DPIA_TS_DPRX_DONE = 0x00, /* Done training DPRX. */
DPIA_TS_TPS1 = 0x01,
DPIA_TS_TPS2 = 0x02,
DPIA_TS_TPS3 = 0x03,
DPIA_TS_TPS4 = 0x07,
DPIA_TS_UFP_DONE = 0xff /* Done training DPTX-to-DPIA hop. */
};
/* SET_CONFIG message data associated with messages sent by driver. */
union dpia_set_config_data {
struct {
uint8_t mode : 1;
uint8_t reserved : 7;
} set_link;
struct {
uint8_t stage;
} set_training;
struct {
uint8_t swing : 2;
uint8_t max_swing_reached : 1;
uint8_t pre_emph : 2;
uint8_t max_pre_emph_reached : 1;
uint8_t reserved : 2;
} set_vspe;
uint8_t raw;
};
/* Read tunneling device capability from DPCD and update link capability
* accordingly.
@ -90,14 +39,5 @@ enum dc_status dpcd_get_tunneling_device_data(struct dc_link *link);
*/
bool dc_link_dpia_query_hpd_status(struct dc_link *link);
/* Train DP tunneling link for USB4 DPIA display endpoint.
* DPIA equivalent of dc_link_dp_perfrorm_link_training.
* Aborts link training upon detection of sink unplug.
*/
enum link_training_result dc_link_dpia_perform_link_training(
struct dc_link *link,
const struct link_resource *link_res,
const struct dc_link_settings *link_setting,
bool skip_video_pattern);
#endif /* __DC_LINK_DPIA_H__ */

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179
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/*
* Copyright 2022 Advanced Micro Devices, Inc.
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
* OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
* ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
* OTHER DEALINGS IN THE SOFTWARE.
*
* Authors: AMD
*
*/
#ifndef __DC_LINK_DP_TRAINING_H__
#define __DC_LINK_DP_TRAINING_H__
#include "link.h"
bool perform_link_training_with_retries(
const struct dc_link_settings *link_setting,
bool skip_video_pattern,
int attempts,
struct pipe_ctx *pipe_ctx,
enum signal_type signal,
bool do_fallback);
enum link_training_result dp_perform_link_training(
struct dc_link *link,
const struct link_resource *link_res,
const struct dc_link_settings *link_settings,
bool skip_video_pattern);
bool dp_set_hw_training_pattern(
struct dc_link *link,
const struct link_resource *link_res,
enum dc_dp_training_pattern pattern,
uint32_t offset);
void dp_set_hw_test_pattern(
struct dc_link *link,
const struct link_resource *link_res,
enum dp_test_pattern test_pattern,
uint8_t *custom_pattern,
uint32_t custom_pattern_size);
void dpcd_set_training_pattern(
struct dc_link *link,
enum dc_dp_training_pattern training_pattern);
/* Write DPCD drive settings. */
enum dc_status dpcd_set_lane_settings(
struct dc_link *link,
const struct link_training_settings *link_training_setting,
uint32_t offset);
/* Write DPCD link configuration data. */
enum dc_status dpcd_set_link_settings(
struct dc_link *link,
const struct link_training_settings *lt_settings);
void dpcd_set_lt_pattern_and_lane_settings(
struct dc_link *link,
const struct link_training_settings *lt_settings,
enum dc_dp_training_pattern pattern,
uint32_t offset);
/* Read training status and adjustment requests from DPCD. */
enum dc_status dp_get_lane_status_and_lane_adjust(
struct dc_link *link,
const struct link_training_settings *link_training_setting,
union lane_status ln_status[LANE_COUNT_DP_MAX],
union lane_align_status_updated *ln_align,
union lane_adjust ln_adjust[LANE_COUNT_DP_MAX],
uint32_t offset);
enum dc_status dpcd_configure_lttpr_mode(
struct dc_link *link,
struct link_training_settings *lt_settings);
enum dc_status configure_lttpr_mode_transparent(struct dc_link *link);
enum dc_status dpcd_configure_channel_coding(
struct dc_link *link,
struct link_training_settings *lt_settings);
void repeater_training_done(struct dc_link *link, uint32_t offset);
void start_clock_recovery_pattern_early(struct dc_link *link,
const struct link_resource *link_res,
struct link_training_settings *lt_settings,
uint32_t offset);
void dp_decide_training_settings(
struct dc_link *link,
const struct dc_link_settings *link_settings,
struct link_training_settings *lt_settings);
void dp_decide_lane_settings(
const struct link_training_settings *lt_settings,
const union lane_adjust ln_adjust[LANE_COUNT_DP_MAX],
struct dc_lane_settings hw_lane_settings[LANE_COUNT_DP_MAX],
union dpcd_training_lane dpcd_lane_settings[LANE_COUNT_DP_MAX]);
enum dc_dp_training_pattern decide_cr_training_pattern(
const struct dc_link_settings *link_settings);
enum dc_dp_training_pattern decide_eq_training_pattern(struct dc_link *link,
const struct dc_link_settings *link_settings);
void dp_get_lttpr_mode_override(struct dc_link *link,
enum lttpr_mode *override);
void override_training_settings(
struct dc_link *link,
const struct dc_link_training_overrides *overrides,
struct link_training_settings *lt_settings);
/* Check DPCD training status registers to detect link loss. */
enum link_training_result dp_check_link_loss_status(
struct dc_link *link,
const struct link_training_settings *link_training_setting);
bool dp_is_cr_done(enum dc_lane_count ln_count,
union lane_status *dpcd_lane_status);
bool dp_is_ch_eq_done(enum dc_lane_count ln_count,
union lane_status *dpcd_lane_status);
bool dp_is_symbol_locked(enum dc_lane_count ln_count,
union lane_status *dpcd_lane_status);
bool dp_is_interlane_aligned(union lane_align_status_updated align_status);
bool is_repeater(const struct link_training_settings *lt_settings, uint32_t offset);
bool dp_is_max_vs_reached(
const struct link_training_settings *lt_settings);
uint8_t get_dpcd_link_rate(const struct dc_link_settings *link_settings);
enum link_training_result dp_get_cr_failure(enum dc_lane_count ln_count,
union lane_status *dpcd_lane_status);
void dp_hw_to_dpcd_lane_settings(
const struct link_training_settings *lt_settings,
const struct dc_lane_settings hw_lane_settings[LANE_COUNT_DP_MAX],
union dpcd_training_lane dpcd_lane_settings[LANE_COUNT_DP_MAX]);
void dp_wait_for_training_aux_rd_interval(
struct dc_link *link,
uint32_t wait_in_micro_secs);
enum dpcd_training_patterns
dp_training_pattern_to_dpcd_training_pattern(
struct dc_link *link,
enum dc_dp_training_pattern pattern);
uint8_t dp_initialize_scrambling_data_symbols(
struct dc_link *link,
enum dc_dp_training_pattern pattern);
void dp_log_training_result(
struct dc_link *link,
const struct link_training_settings *lt_settings,
enum link_training_result status);
uint32_t dp_translate_training_aux_read_interval(
uint32_t dpcd_aux_read_interval);
#endif /* __DC_LINK_DP_TRAINING_H__ */

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@ -0,0 +1,258 @@
/*
* Copyright 2022 Advanced Micro Devices, Inc.
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
* OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
* ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
* OTHER DEALINGS IN THE SOFTWARE.
*
* Authors: AMD
*
*/
/* FILE POLICY AND INTENDED USAGE:
* This file implements dp 128b/132b link training software policies and
* sequences.
*/
#include "link_dp_training_128b_132b.h"
#include "link_dp_training_8b_10b.h"
#include "link_dpcd.h"
#include "dc_link_dp.h"
#define DC_LOGGER \
link->ctx->logger
static enum dc_status dpcd_128b_132b_set_lane_settings(
struct dc_link *link,
const struct link_training_settings *link_training_setting)
{
enum dc_status status = core_link_write_dpcd(link,
DP_TRAINING_LANE0_SET,
(uint8_t *)(link_training_setting->dpcd_lane_settings),
sizeof(link_training_setting->dpcd_lane_settings));
DC_LOG_HW_LINK_TRAINING("%s:\n 0x%X TX_FFE_PRESET_VALUE = %x\n",
__func__,
DP_TRAINING_LANE0_SET,
link_training_setting->dpcd_lane_settings[0].tx_ffe.PRESET_VALUE);
return status;
}
static void dpcd_128b_132b_get_aux_rd_interval(struct dc_link *link,
uint32_t *interval_in_us)
{
union dp_128b_132b_training_aux_rd_interval dpcd_interval;
uint32_t interval_unit = 0;
dpcd_interval.raw = 0;
core_link_read_dpcd(link, DP_128B132B_TRAINING_AUX_RD_INTERVAL,
&dpcd_interval.raw, sizeof(dpcd_interval.raw));
interval_unit = dpcd_interval.bits.UNIT ? 1 : 2; /* 0b = 2 ms, 1b = 1 ms */
/* (128b/132b_TRAINING_AUX_RD_INTERVAL value + 1) *
* INTERVAL_UNIT. The maximum is 256 ms
*/
*interval_in_us = (dpcd_interval.bits.VALUE + 1) * interval_unit * 1000;
}
static enum link_training_result dp_perform_128b_132b_channel_eq_done_sequence(
struct dc_link *link,
const struct link_resource *link_res,
struct link_training_settings *lt_settings)
{
uint8_t loop_count;
uint32_t aux_rd_interval = 0;
uint32_t wait_time = 0;
union lane_align_status_updated dpcd_lane_status_updated = {0};
union lane_status dpcd_lane_status[LANE_COUNT_DP_MAX] = {0};
union lane_adjust dpcd_lane_adjust[LANE_COUNT_DP_MAX] = {0};
enum dc_status status = DC_OK;
enum link_training_result result = LINK_TRAINING_SUCCESS;
/* Transmit 128b/132b_TPS1 over Main-Link */
dp_set_hw_training_pattern(link, link_res, lt_settings->pattern_for_cr, DPRX);
/* Set TRAINING_PATTERN_SET to 01h */
dpcd_set_training_pattern(link, lt_settings->pattern_for_cr);
/* Adjust TX_FFE_PRESET_VALUE and Transmit 128b/132b_TPS2 over Main-Link */
dpcd_128b_132b_get_aux_rd_interval(link, &aux_rd_interval);
dp_get_lane_status_and_lane_adjust(link, lt_settings, dpcd_lane_status,
&dpcd_lane_status_updated, dpcd_lane_adjust, DPRX);
dp_decide_lane_settings(lt_settings, dpcd_lane_adjust,
lt_settings->hw_lane_settings, lt_settings->dpcd_lane_settings);
dp_set_hw_lane_settings(link, link_res, lt_settings, DPRX);
dp_set_hw_training_pattern(link, link_res, lt_settings->pattern_for_eq, DPRX);
/* Set loop counter to start from 1 */
loop_count = 1;
/* Set TRAINING_PATTERN_SET to 02h and TX_FFE_PRESET_VALUE in one AUX transaction */
dpcd_set_lt_pattern_and_lane_settings(link, lt_settings,
lt_settings->pattern_for_eq, DPRX);
/* poll for channel EQ done */
while (result == LINK_TRAINING_SUCCESS) {
dp_wait_for_training_aux_rd_interval(link, aux_rd_interval);
wait_time += aux_rd_interval;
status = dp_get_lane_status_and_lane_adjust(link, lt_settings, dpcd_lane_status,
&dpcd_lane_status_updated, dpcd_lane_adjust, DPRX);
dp_decide_lane_settings(lt_settings, dpcd_lane_adjust,
lt_settings->hw_lane_settings, lt_settings->dpcd_lane_settings);
dpcd_128b_132b_get_aux_rd_interval(link, &aux_rd_interval);
if (status != DC_OK) {
result = LINK_TRAINING_ABORT;
} else if (dp_is_ch_eq_done(lt_settings->link_settings.lane_count,
dpcd_lane_status)) {
/* pass */
break;
} else if (loop_count >= lt_settings->eq_loop_count_limit) {
result = DP_128b_132b_MAX_LOOP_COUNT_REACHED;
} else if (dpcd_lane_status_updated.bits.LT_FAILED_128b_132b) {
result = DP_128b_132b_LT_FAILED;
} else {
dp_set_hw_lane_settings(link, link_res, lt_settings, DPRX);
dpcd_128b_132b_set_lane_settings(link, lt_settings);
}
loop_count++;
}
/* poll for EQ interlane align done */
while (result == LINK_TRAINING_SUCCESS) {
if (status != DC_OK) {
result = LINK_TRAINING_ABORT;
} else if (dpcd_lane_status_updated.bits.EQ_INTERLANE_ALIGN_DONE_128b_132b) {
/* pass */
break;
} else if (wait_time >= lt_settings->eq_wait_time_limit) {
result = DP_128b_132b_CHANNEL_EQ_DONE_TIMEOUT;
} else if (dpcd_lane_status_updated.bits.LT_FAILED_128b_132b) {
result = DP_128b_132b_LT_FAILED;
} else {
dp_wait_for_training_aux_rd_interval(link,
lt_settings->eq_pattern_time);
wait_time += lt_settings->eq_pattern_time;
status = dp_get_lane_status_and_lane_adjust(link, lt_settings, dpcd_lane_status,
&dpcd_lane_status_updated, dpcd_lane_adjust, DPRX);
}
}
return result;
}
static enum link_training_result dp_perform_128b_132b_cds_done_sequence(
struct dc_link *link,
const struct link_resource *link_res,
struct link_training_settings *lt_settings)
{
/* Assumption: assume hardware has transmitted eq pattern */
enum dc_status status = DC_OK;
enum link_training_result result = LINK_TRAINING_SUCCESS;
union lane_align_status_updated dpcd_lane_status_updated = {0};
union lane_status dpcd_lane_status[LANE_COUNT_DP_MAX] = {0};
union lane_adjust dpcd_lane_adjust[LANE_COUNT_DP_MAX] = {0};
uint32_t wait_time = 0;
/* initiate CDS done sequence */
dpcd_set_training_pattern(link, lt_settings->pattern_for_cds);
/* poll for CDS interlane align done and symbol lock */
while (result == LINK_TRAINING_SUCCESS) {
dp_wait_for_training_aux_rd_interval(link,
lt_settings->cds_pattern_time);
wait_time += lt_settings->cds_pattern_time;
status = dp_get_lane_status_and_lane_adjust(link, lt_settings, dpcd_lane_status,
&dpcd_lane_status_updated, dpcd_lane_adjust, DPRX);
if (status != DC_OK) {
result = LINK_TRAINING_ABORT;
} else if (dp_is_symbol_locked(lt_settings->link_settings.lane_count, dpcd_lane_status) &&
dpcd_lane_status_updated.bits.CDS_INTERLANE_ALIGN_DONE_128b_132b) {
/* pass */
break;
} else if (dpcd_lane_status_updated.bits.LT_FAILED_128b_132b) {
result = DP_128b_132b_LT_FAILED;
} else if (wait_time >= lt_settings->cds_wait_time_limit) {
result = DP_128b_132b_CDS_DONE_TIMEOUT;
}
}
return result;
}
enum link_training_result dp_perform_128b_132b_link_training(
struct dc_link *link,
const struct link_resource *link_res,
struct link_training_settings *lt_settings)
{
enum link_training_result result = LINK_TRAINING_SUCCESS;
/* TODO - DP2.0 Link: remove legacy_dp2_lt logic */
if (link->dc->debug.legacy_dp2_lt) {
struct link_training_settings legacy_settings;
decide_8b_10b_training_settings(link,
&lt_settings->link_settings,
&legacy_settings);
return dp_perform_8b_10b_link_training(link, link_res, &legacy_settings);
}
dpcd_set_link_settings(link, lt_settings);
if (result == LINK_TRAINING_SUCCESS)
result = dp_perform_128b_132b_channel_eq_done_sequence(link, link_res, lt_settings);
if (result == LINK_TRAINING_SUCCESS)
result = dp_perform_128b_132b_cds_done_sequence(link, link_res, lt_settings);
return result;
}
void decide_128b_132b_training_settings(struct dc_link *link,
const struct dc_link_settings *link_settings,
struct link_training_settings *lt_settings)
{
memset(lt_settings, 0, sizeof(*lt_settings));
lt_settings->link_settings = *link_settings;
/* TODO: should decide link spread when populating link_settings */
lt_settings->link_settings.link_spread = link->dp_ss_off ? LINK_SPREAD_DISABLED :
LINK_SPREAD_05_DOWNSPREAD_30KHZ;
lt_settings->pattern_for_cr = decide_cr_training_pattern(link_settings);
lt_settings->pattern_for_eq = decide_eq_training_pattern(link, link_settings);
lt_settings->eq_pattern_time = 2500;
lt_settings->eq_wait_time_limit = 400000;
lt_settings->eq_loop_count_limit = 20;
lt_settings->pattern_for_cds = DP_128b_132b_TPS2_CDS;
lt_settings->cds_pattern_time = 2500;
lt_settings->cds_wait_time_limit = (dp_convert_to_count(
link->dpcd_caps.lttpr_caps.phy_repeater_cnt) + 1) * 20000;
lt_settings->disallow_per_lane_settings = true;
lt_settings->lttpr_mode = dp_decide_128b_132b_lttpr_mode(link);
dp_hw_to_dpcd_lane_settings(lt_settings,
lt_settings->hw_lane_settings, lt_settings->dpcd_lane_settings);
}
enum lttpr_mode dp_decide_128b_132b_lttpr_mode(struct dc_link *link)
{
enum lttpr_mode mode = LTTPR_MODE_NON_LTTPR;
if (dp_is_lttpr_present(link))
mode = LTTPR_MODE_NON_TRANSPARENT;
DC_LOG_DC("128b_132b chose LTTPR_MODE %d.\n", mode);
return mode;
}

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@ -0,0 +1,42 @@
/*
* Copyright 2022 Advanced Micro Devices, Inc.
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
* OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
* ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
* OTHER DEALINGS IN THE SOFTWARE.
*
* Authors: AMD
*
*/
#ifndef __DC_LINK_DP_TRAINING_128B_132B_H__
#define __DC_LINK_DP_TRAINING_128B_132B_H__
#include "link_dp_training.h"
enum link_training_result dp_perform_128b_132b_link_training(
struct dc_link *link,
const struct link_resource *link_res,
struct link_training_settings *lt_settings);
void decide_128b_132b_training_settings(struct dc_link *link,
const struct dc_link_settings *link_settings,
struct link_training_settings *lt_settings);
enum lttpr_mode dp_decide_128b_132b_lttpr_mode(struct dc_link *link);
#endif /* __DC_LINK_DP_TRAINING_128B_132B_H__ */

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@ -0,0 +1,413 @@
/*
* Copyright 2022 Advanced Micro Devices, Inc.
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
* OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
* ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
* OTHER DEALINGS IN THE SOFTWARE.
*
* Authors: AMD
*
*/
/* FILE POLICY AND INTENDED USAGE:
* This file implements dp 8b/10b link training software policies and
* sequences.
*/
#include "link_dp_training_8b_10b.h"
#include "link_dpcd.h"
#include "dc_link_dp.h"
#define DC_LOGGER \
link->ctx->logger
static int32_t get_cr_training_aux_rd_interval(struct dc_link *link,
const struct dc_link_settings *link_settings)
{
union training_aux_rd_interval training_rd_interval;
uint32_t wait_in_micro_secs = 100;
memset(&training_rd_interval, 0, sizeof(training_rd_interval));
if (dp_get_link_encoding_format(link_settings) == DP_8b_10b_ENCODING &&
link->dpcd_caps.dpcd_rev.raw >= DPCD_REV_12) {
core_link_read_dpcd(
link,
DP_TRAINING_AUX_RD_INTERVAL,
(uint8_t *)&training_rd_interval,
sizeof(training_rd_interval));
if (training_rd_interval.bits.TRAINIG_AUX_RD_INTERVAL)
wait_in_micro_secs = training_rd_interval.bits.TRAINIG_AUX_RD_INTERVAL * 4000;
}
return wait_in_micro_secs;
}
static uint32_t get_eq_training_aux_rd_interval(
struct dc_link *link,
const struct dc_link_settings *link_settings)
{
union training_aux_rd_interval training_rd_interval;
memset(&training_rd_interval, 0, sizeof(training_rd_interval));
if (dp_get_link_encoding_format(link_settings) == DP_128b_132b_ENCODING) {
core_link_read_dpcd(
link,
DP_128B132B_TRAINING_AUX_RD_INTERVAL,
(uint8_t *)&training_rd_interval,
sizeof(training_rd_interval));
} else if (dp_get_link_encoding_format(link_settings) == DP_8b_10b_ENCODING &&
link->dpcd_caps.dpcd_rev.raw >= DPCD_REV_12) {
core_link_read_dpcd(
link,
DP_TRAINING_AUX_RD_INTERVAL,
(uint8_t *)&training_rd_interval,
sizeof(training_rd_interval));
}
switch (training_rd_interval.bits.TRAINIG_AUX_RD_INTERVAL) {
case 0: return 400;
case 1: return 4000;
case 2: return 8000;
case 3: return 12000;
case 4: return 16000;
case 5: return 32000;
case 6: return 64000;
default: return 400;
}
}
void decide_8b_10b_training_settings(
struct dc_link *link,
const struct dc_link_settings *link_setting,
struct link_training_settings *lt_settings)
{
memset(lt_settings, '\0', sizeof(struct link_training_settings));
/* Initialize link settings */
lt_settings->link_settings.use_link_rate_set = link_setting->use_link_rate_set;
lt_settings->link_settings.link_rate_set = link_setting->link_rate_set;
lt_settings->link_settings.link_rate = link_setting->link_rate;
lt_settings->link_settings.lane_count = link_setting->lane_count;
/* TODO hard coded to SS for now
* lt_settings.link_settings.link_spread =
* dal_display_path_is_ss_supported(
* path_mode->display_path) ?
* LINK_SPREAD_05_DOWNSPREAD_30KHZ :
* LINK_SPREAD_DISABLED;
*/
lt_settings->link_settings.link_spread = link->dp_ss_off ?
LINK_SPREAD_DISABLED : LINK_SPREAD_05_DOWNSPREAD_30KHZ;
lt_settings->cr_pattern_time = get_cr_training_aux_rd_interval(link, link_setting);
lt_settings->eq_pattern_time = get_eq_training_aux_rd_interval(link, link_setting);
lt_settings->pattern_for_cr = decide_cr_training_pattern(link_setting);
lt_settings->pattern_for_eq = decide_eq_training_pattern(link, link_setting);
lt_settings->enhanced_framing = 1;
lt_settings->should_set_fec_ready = true;
lt_settings->disallow_per_lane_settings = true;
lt_settings->always_match_dpcd_with_hw_lane_settings = true;
lt_settings->lttpr_mode = dp_decide_8b_10b_lttpr_mode(link);
dp_hw_to_dpcd_lane_settings(lt_settings, lt_settings->hw_lane_settings, lt_settings->dpcd_lane_settings);
}
enum lttpr_mode dp_decide_8b_10b_lttpr_mode(struct dc_link *link)
{
bool is_lttpr_present = dp_is_lttpr_present(link);
bool vbios_lttpr_force_non_transparent = link->dc->caps.vbios_lttpr_enable;
bool vbios_lttpr_aware = link->dc->caps.vbios_lttpr_aware;
if (!is_lttpr_present)
return LTTPR_MODE_NON_LTTPR;
if (vbios_lttpr_aware) {
if (vbios_lttpr_force_non_transparent) {
DC_LOG_DC("chose LTTPR_MODE_NON_TRANSPARENT due to VBIOS DCE_INFO_CAPS_LTTPR_SUPPORT_ENABLE set to 1.\n");
return LTTPR_MODE_NON_TRANSPARENT;
} else {
DC_LOG_DC("chose LTTPR_MODE_NON_TRANSPARENT by default due to VBIOS not set DCE_INFO_CAPS_LTTPR_SUPPORT_ENABLE set to 1.\n");
return LTTPR_MODE_TRANSPARENT;
}
}
if (link->dc->config.allow_lttpr_non_transparent_mode.bits.DP1_4A &&
link->dc->caps.extended_aux_timeout_support) {
DC_LOG_DC("chose LTTPR_MODE_NON_TRANSPARENT by default and dc->config.allow_lttpr_non_transparent_mode.bits.DP1_4A set to 1.\n");
return LTTPR_MODE_NON_TRANSPARENT;
}
DC_LOG_DC("chose LTTPR_MODE_NON_LTTPR.\n");
return LTTPR_MODE_NON_LTTPR;
}
enum link_training_result perform_8b_10b_clock_recovery_sequence(
struct dc_link *link,
const struct link_resource *link_res,
struct link_training_settings *lt_settings,
uint32_t offset)
{
uint32_t retries_cr;
uint32_t retry_count;
uint32_t wait_time_microsec;
enum dc_lane_count lane_count = lt_settings->link_settings.lane_count;
union lane_status dpcd_lane_status[LANE_COUNT_DP_MAX];
union lane_align_status_updated dpcd_lane_status_updated;
union lane_adjust dpcd_lane_adjust[LANE_COUNT_DP_MAX] = {0};
retries_cr = 0;
retry_count = 0;
memset(&dpcd_lane_status, '\0', sizeof(dpcd_lane_status));
memset(&dpcd_lane_status_updated, '\0',
sizeof(dpcd_lane_status_updated));
if (!link->ctx->dc->work_arounds.lt_early_cr_pattern)
dp_set_hw_training_pattern(link, link_res, lt_settings->pattern_for_cr, offset);
/* najeeb - The synaptics MST hub can put the LT in
* infinite loop by switching the VS
*/
/* between level 0 and level 1 continuously, here
* we try for CR lock for LinkTrainingMaxCRRetry count*/
while ((retries_cr < LINK_TRAINING_MAX_RETRY_COUNT) &&
(retry_count < LINK_TRAINING_MAX_CR_RETRY)) {
/* 1. call HWSS to set lane settings*/
dp_set_hw_lane_settings(
link,
link_res,
lt_settings,
offset);
/* 2. update DPCD of the receiver*/
if (!retry_count)
/* EPR #361076 - write as a 5-byte burst,
* but only for the 1-st iteration.*/
dpcd_set_lt_pattern_and_lane_settings(
link,
lt_settings,
lt_settings->pattern_for_cr,
offset);
else
dpcd_set_lane_settings(
link,
lt_settings,
offset);
/* 3. wait receiver to lock-on*/
wait_time_microsec = lt_settings->cr_pattern_time;
dp_wait_for_training_aux_rd_interval(
link,
wait_time_microsec);
/* 4. Read lane status and requested drive
* settings as set by the sink
*/
dp_get_lane_status_and_lane_adjust(
link,
lt_settings,
dpcd_lane_status,
&dpcd_lane_status_updated,
dpcd_lane_adjust,
offset);
/* 5. check CR done*/
if (dp_is_cr_done(lane_count, dpcd_lane_status))
return LINK_TRAINING_SUCCESS;
/* 6. max VS reached*/
if ((dp_get_link_encoding_format(&lt_settings->link_settings) ==
DP_8b_10b_ENCODING) &&
dp_is_max_vs_reached(lt_settings))
break;
/* 7. same lane settings*/
/* Note: settings are the same for all lanes,
* so comparing first lane is sufficient*/
if ((dp_get_link_encoding_format(&lt_settings->link_settings) == DP_8b_10b_ENCODING) &&
lt_settings->dpcd_lane_settings[0].bits.VOLTAGE_SWING_SET ==
dpcd_lane_adjust[0].bits.VOLTAGE_SWING_LANE)
retries_cr++;
else if ((dp_get_link_encoding_format(&lt_settings->link_settings) == DP_128b_132b_ENCODING) &&
lt_settings->dpcd_lane_settings[0].tx_ffe.PRESET_VALUE ==
dpcd_lane_adjust[0].tx_ffe.PRESET_VALUE)
retries_cr++;
else
retries_cr = 0;
/* 8. update VS/PE/PC2 in lt_settings*/
dp_decide_lane_settings(lt_settings, dpcd_lane_adjust,
lt_settings->hw_lane_settings, lt_settings->dpcd_lane_settings);
retry_count++;
}
if (retry_count >= LINK_TRAINING_MAX_CR_RETRY) {
ASSERT(0);
DC_LOG_ERROR("%s: Link Training Error, could not get CR after %d tries. Possibly voltage swing issue",
__func__,
LINK_TRAINING_MAX_CR_RETRY);
}
return dp_get_cr_failure(lane_count, dpcd_lane_status);
}
enum link_training_result perform_8b_10b_channel_equalization_sequence(
struct dc_link *link,
const struct link_resource *link_res,
struct link_training_settings *lt_settings,
uint32_t offset)
{
enum dc_dp_training_pattern tr_pattern;
uint32_t retries_ch_eq;
uint32_t wait_time_microsec;
enum dc_lane_count lane_count = lt_settings->link_settings.lane_count;
union lane_align_status_updated dpcd_lane_status_updated = {0};
union lane_status dpcd_lane_status[LANE_COUNT_DP_MAX] = {0};
union lane_adjust dpcd_lane_adjust[LANE_COUNT_DP_MAX] = {0};
/* Note: also check that TPS4 is a supported feature*/
tr_pattern = lt_settings->pattern_for_eq;
if (is_repeater(lt_settings, offset) && dp_get_link_encoding_format(&lt_settings->link_settings) == DP_8b_10b_ENCODING)
tr_pattern = DP_TRAINING_PATTERN_SEQUENCE_4;
dp_set_hw_training_pattern(link, link_res, tr_pattern, offset);
for (retries_ch_eq = 0; retries_ch_eq <= LINK_TRAINING_MAX_RETRY_COUNT;
retries_ch_eq++) {
dp_set_hw_lane_settings(link, link_res, lt_settings, offset);
/* 2. update DPCD*/
if (!retries_ch_eq)
/* EPR #361076 - write as a 5-byte burst,
* but only for the 1-st iteration
*/
dpcd_set_lt_pattern_and_lane_settings(
link,
lt_settings,
tr_pattern, offset);
else
dpcd_set_lane_settings(link, lt_settings, offset);
/* 3. wait for receiver to lock-on*/
wait_time_microsec = lt_settings->eq_pattern_time;
if (is_repeater(lt_settings, offset))
wait_time_microsec =
dp_translate_training_aux_read_interval(
link->dpcd_caps.lttpr_caps.aux_rd_interval[offset - 1]);
dp_wait_for_training_aux_rd_interval(
link,
wait_time_microsec);
/* 4. Read lane status and requested
* drive settings as set by the sink*/
dp_get_lane_status_and_lane_adjust(
link,
lt_settings,
dpcd_lane_status,
&dpcd_lane_status_updated,
dpcd_lane_adjust,
offset);
/* 5. check CR done*/
if (!dp_is_cr_done(lane_count, dpcd_lane_status))
return dpcd_lane_status[0].bits.CR_DONE_0 ?
LINK_TRAINING_EQ_FAIL_CR_PARTIAL :
LINK_TRAINING_EQ_FAIL_CR;
/* 6. check CHEQ done*/
if (dp_is_ch_eq_done(lane_count, dpcd_lane_status) &&
dp_is_symbol_locked(lane_count, dpcd_lane_status) &&
dp_is_interlane_aligned(dpcd_lane_status_updated))
return LINK_TRAINING_SUCCESS;
/* 7. update VS/PE/PC2 in lt_settings*/
dp_decide_lane_settings(lt_settings, dpcd_lane_adjust,
lt_settings->hw_lane_settings, lt_settings->dpcd_lane_settings);
}
return LINK_TRAINING_EQ_FAIL_EQ;
}
enum link_training_result dp_perform_8b_10b_link_training(
struct dc_link *link,
const struct link_resource *link_res,
struct link_training_settings *lt_settings)
{
enum link_training_result status = LINK_TRAINING_SUCCESS;
uint8_t repeater_cnt;
uint8_t repeater_id;
uint8_t lane = 0;
if (link->ctx->dc->work_arounds.lt_early_cr_pattern)
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_mode == LTTPR_MODE_NON_TRANSPARENT) {
/* 2. perform link training (set link training done
* to false is done as well)
*/
repeater_cnt = dp_convert_to_count(link->dpcd_caps.lttpr_caps.phy_repeater_cnt);
for (repeater_id = repeater_cnt; (repeater_id > 0 && status == LINK_TRAINING_SUCCESS);
repeater_id--) {
status = perform_8b_10b_clock_recovery_sequence(link, link_res, lt_settings, repeater_id);
if (status != LINK_TRAINING_SUCCESS) {
repeater_training_done(link, repeater_id);
break;
}
status = perform_8b_10b_channel_equalization_sequence(link,
link_res,
lt_settings,
repeater_id);
repeater_training_done(link, repeater_id);
if (status != LINK_TRAINING_SUCCESS)
break;
for (lane = 0; lane < LANE_COUNT_DP_MAX; lane++) {
lt_settings->dpcd_lane_settings[lane].raw = 0;
lt_settings->hw_lane_settings[lane].VOLTAGE_SWING = 0;
lt_settings->hw_lane_settings[lane].PRE_EMPHASIS = 0;
}
}
}
if (status == LINK_TRAINING_SUCCESS) {
status = perform_8b_10b_clock_recovery_sequence(link, link_res, lt_settings, DPRX);
if (status == LINK_TRAINING_SUCCESS) {
status = perform_8b_10b_channel_equalization_sequence(link,
link_res,
lt_settings,
DPRX);
}
}
return status;
}

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/*
* Copyright 2022 Advanced Micro Devices, Inc.
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
* OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
* ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
* OTHER DEALINGS IN THE SOFTWARE.
*
* Authors: AMD
*
*/
#ifndef __DC_LINK_DP_TRAINING_8B_10B_H__
#define __DC_LINK_DP_TRAINING_8B_10B_H__
#include "link_dp_training.h"
/* to avoid infinite loop where-in the receiver
* switches between different VS
*/
#define LINK_TRAINING_MAX_CR_RETRY 100
#define LINK_TRAINING_MAX_RETRY_COUNT 5
enum link_training_result dp_perform_8b_10b_link_training(
struct dc_link *link,
const struct link_resource *link_res,
struct link_training_settings *lt_settings);
enum link_training_result perform_8b_10b_clock_recovery_sequence(
struct dc_link *link,
const struct link_resource *link_res,
struct link_training_settings *lt_settings,
uint32_t offset);
enum link_training_result perform_8b_10b_channel_equalization_sequence(
struct dc_link *link,
const struct link_resource *link_res,
struct link_training_settings *lt_settings,
uint32_t offset);
enum lttpr_mode dp_decide_8b_10b_lttpr_mode(struct dc_link *link);
void decide_8b_10b_training_settings(
struct dc_link *link,
const struct dc_link_settings *link_setting,
struct link_training_settings *lt_settings);
#endif /* __DC_LINK_DP_TRAINING_8B_10B_H__ */

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/*
* Copyright 2022 Advanced Micro Devices, Inc.
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
* OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
* ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
* OTHER DEALINGS IN THE SOFTWARE.
*
* Authors: AMD
*
*/
/* FILE POLICY AND INTENDED USAGE:
*
*/
#include "link_dp_training_auxless.h"
#include "dc_link_dp.h"
#define DC_LOGGER \
link->ctx->logger
bool dc_link_dp_perform_link_training_skip_aux(
struct dc_link *link,
const struct link_resource *link_res,
const struct dc_link_settings *link_setting)
{
struct link_training_settings lt_settings = {0};
dp_decide_training_settings(
link,
link_setting,
&lt_settings);
override_training_settings(
link,
&link->preferred_training_settings,
&lt_settings);
/* 1. Perform_clock_recovery_sequence. */
/* transmit training pattern for clock recovery */
dp_set_hw_training_pattern(link, link_res, lt_settings.pattern_for_cr, DPRX);
/* call HWSS to set lane settings*/
dp_set_hw_lane_settings(link, link_res, &lt_settings, DPRX);
/* wait receiver to lock-on*/
dp_wait_for_training_aux_rd_interval(link, lt_settings.cr_pattern_time);
/* 2. Perform_channel_equalization_sequence. */
/* transmit training pattern for channel equalization. */
dp_set_hw_training_pattern(link, link_res, lt_settings.pattern_for_eq, DPRX);
/* call HWSS to set lane settings*/
dp_set_hw_lane_settings(link, link_res, &lt_settings, DPRX);
/* wait receiver to lock-on. */
dp_wait_for_training_aux_rd_interval(link, lt_settings.eq_pattern_time);
/* 3. Perform_link_training_int. */
/* Mainlink output idle pattern. */
dp_set_hw_test_pattern(link, link_res, DP_TEST_PATTERN_VIDEO_MODE, NULL, 0);
dp_log_training_result(link, &lt_settings, LINK_TRAINING_SUCCESS);
return true;
}

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/*
* Copyright 2022 Advanced Micro Devices, Inc.
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
* OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
* ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
* OTHER DEALINGS IN THE SOFTWARE.
*
* Authors: AMD
*
*/
#ifndef __DC_LINK_DP_TRAINING_AUXLESS_H__
#define __DC_LINK_DP_TRAINING_AUXLESS_H__
#include "link_dp_training.h"
bool dc_link_dp_perform_link_training_skip_aux(
struct dc_link *link,
const struct link_resource *link_res,
const struct dc_link_settings *link_setting);
#endif /* __DC_LINK_DP_TRAINING_AUXLESS_H__ */

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/*
* Copyright 2022 Advanced Micro Devices, Inc.
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
* OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
* ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
* OTHER DEALINGS IN THE SOFTWARE.
*
* Authors: AMD
*
*/
#ifndef __DC_LINK_DP_TRAINING_DPIA_H__
#define __DC_LINK_DP_TRAINING_DPIA_H__
#include "link_dp_training.h"
/* Train DP tunneling link for USB4 DPIA display endpoint.
* DPIA equivalent of dc_link_dp_perfrorm_link_training.
* Aborts link training upon detection of sink unplug.
*/
enum link_training_result dc_link_dpia_perform_link_training(
struct dc_link *link,
const struct link_resource *link_res,
const struct dc_link_settings *link_setting,
bool skip_video_pattern);
#endif /* __DC_LINK_DP_TRAINING_DPIA_H__ */

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/*
* Copyright 2022 Advanced Micro Devices, Inc.
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
* OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
* ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
* OTHER DEALINGS IN THE SOFTWARE.
*
* Authors: AMD
*
*/
/* FILE POLICY AND INTENDED USAGE:
* This file implements 8b/10b link training specially modified to support an
* embedded retimer chip. This retimer chip is referred as fixed vs pe retimer.
* Unlike native dp connection this chip requires a modified link training
* protocol based on 8b/10b link training. Since this is a non standard sequence
* and we must support this hardware, we decided to isolate it in its own
* training sequence inside its own file.
*/
#include "link_dp_training_fixed_vs_pe_retimer.h"
#include "link_dp_training_8b_10b.h"
#include "link_dpcd.h"
#include "dc_link_dp.h"
#define DC_LOGGER \
link->ctx->logger
void dp_fixed_vs_pe_read_lane_adjust(
struct dc_link *link,
union dpcd_training_lane dpcd_lane_adjust[LANE_COUNT_DP_MAX])
{
const uint8_t vendor_lttpr_write_data_vs[3] = {0x0, 0x53, 0x63};
const uint8_t vendor_lttpr_write_data_pe[3] = {0x0, 0x54, 0x63};
const uint8_t offset = dp_convert_to_count(
link->dpcd_caps.lttpr_caps.phy_repeater_cnt);
uint32_t vendor_lttpr_write_address = 0xF004F;
uint32_t vendor_lttpr_read_address = 0xF0053;
uint8_t dprx_vs = 0;
uint8_t dprx_pe = 0;
uint8_t lane;
if (offset != 0xFF) {
vendor_lttpr_write_address +=
((DP_REPEATER_CONFIGURATION_AND_STATUS_SIZE) * (offset - 1));
vendor_lttpr_read_address +=
((DP_REPEATER_CONFIGURATION_AND_STATUS_SIZE) * (offset - 1));
}
/* W/A to read lane settings requested by DPRX */
core_link_write_dpcd(
link,
vendor_lttpr_write_address,
&vendor_lttpr_write_data_vs[0],
sizeof(vendor_lttpr_write_data_vs));
core_link_read_dpcd(
link,
vendor_lttpr_read_address,
&dprx_vs,
1);
core_link_write_dpcd(
link,
vendor_lttpr_write_address,
&vendor_lttpr_write_data_pe[0],
sizeof(vendor_lttpr_write_data_pe));
core_link_read_dpcd(
link,
vendor_lttpr_read_address,
&dprx_pe,
1);
for (lane = 0; lane < LANE_COUNT_DP_MAX; lane++) {
dpcd_lane_adjust[lane].bits.VOLTAGE_SWING_SET = (dprx_vs >> (2 * lane)) & 0x3;
dpcd_lane_adjust[lane].bits.PRE_EMPHASIS_SET = (dprx_pe >> (2 * lane)) & 0x3;
}
}
void dp_fixed_vs_pe_set_retimer_lane_settings(
struct dc_link *link,
const union dpcd_training_lane dpcd_lane_adjust[LANE_COUNT_DP_MAX],
uint8_t lane_count)
{
const uint8_t offset = dp_convert_to_count(
link->dpcd_caps.lttpr_caps.phy_repeater_cnt);
const uint8_t vendor_lttpr_write_data_reset[4] = {0x1, 0x50, 0x63, 0xFF};
uint32_t vendor_lttpr_write_address = 0xF004F;
uint8_t vendor_lttpr_write_data_vs[4] = {0x1, 0x51, 0x63, 0x0};
uint8_t vendor_lttpr_write_data_pe[4] = {0x1, 0x52, 0x63, 0x0};
uint8_t lane = 0;
if (offset != 0xFF) {
vendor_lttpr_write_address +=
((DP_REPEATER_CONFIGURATION_AND_STATUS_SIZE) * (offset - 1));
}
for (lane = 0; lane < lane_count; lane++) {
vendor_lttpr_write_data_vs[3] |=
dpcd_lane_adjust[lane].bits.VOLTAGE_SWING_SET << (2 * lane);
vendor_lttpr_write_data_pe[3] |=
dpcd_lane_adjust[lane].bits.PRE_EMPHASIS_SET << (2 * lane);
}
/* Force LTTPR to output desired VS and PE */
core_link_write_dpcd(
link,
vendor_lttpr_write_address,
&vendor_lttpr_write_data_reset[0],
sizeof(vendor_lttpr_write_data_reset));
core_link_write_dpcd(
link,
vendor_lttpr_write_address,
&vendor_lttpr_write_data_vs[0],
sizeof(vendor_lttpr_write_data_vs));
core_link_write_dpcd(
link,
vendor_lttpr_write_address,
&vendor_lttpr_write_data_pe[0],
sizeof(vendor_lttpr_write_data_pe));
}
static enum link_training_result perform_fixed_vs_pe_nontransparent_training_sequence(
struct dc_link *link,
const struct link_resource *link_res,
struct link_training_settings *lt_settings)
{
enum link_training_result status = LINK_TRAINING_SUCCESS;
uint8_t lane = 0;
uint8_t toggle_rate = 0x6;
uint8_t target_rate = 0x6;
bool apply_toggle_rate_wa = false;
uint8_t repeater_cnt;
uint8_t repeater_id;
/* Fixed VS/PE specific: Force CR AUX RD Interval to at least 16ms */
if (lt_settings->cr_pattern_time < 16000)
lt_settings->cr_pattern_time = 16000;
/* Fixed VS/PE specific: Toggle link rate */
apply_toggle_rate_wa = (link->vendor_specific_lttpr_link_rate_wa == target_rate);
target_rate = get_dpcd_link_rate(&lt_settings->link_settings);
toggle_rate = (target_rate == 0x6) ? 0xA : 0x6;
if (apply_toggle_rate_wa)
lt_settings->link_settings.link_rate = toggle_rate;
if (link->ctx->dc->work_arounds.lt_early_cr_pattern)
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);
/* Fixed VS/PE specific: Toggle link rate back*/
if (apply_toggle_rate_wa) {
core_link_write_dpcd(
link,
DP_LINK_BW_SET,
&target_rate,
1);
}
link->vendor_specific_lttpr_link_rate_wa = target_rate;
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_convert_to_count(link->dpcd_caps.lttpr_caps.phy_repeater_cnt);
for (repeater_id = repeater_cnt; (repeater_id > 0 && status == LINK_TRAINING_SUCCESS);
repeater_id--) {
status = perform_8b_10b_clock_recovery_sequence(link, link_res, lt_settings, repeater_id);
if (status != LINK_TRAINING_SUCCESS) {
repeater_training_done(link, repeater_id);
break;
}
status = perform_8b_10b_channel_equalization_sequence(link,
link_res,
lt_settings,
repeater_id);
repeater_training_done(link, repeater_id);
if (status != LINK_TRAINING_SUCCESS)
break;
for (lane = 0; lane < LANE_COUNT_DP_MAX; lane++) {
lt_settings->dpcd_lane_settings[lane].raw = 0;
lt_settings->hw_lane_settings[lane].VOLTAGE_SWING = 0;
lt_settings->hw_lane_settings[lane].PRE_EMPHASIS = 0;
}
}
}
if (status == LINK_TRAINING_SUCCESS) {
status = perform_8b_10b_clock_recovery_sequence(link, link_res, lt_settings, DPRX);
if (status == LINK_TRAINING_SUCCESS) {
status = perform_8b_10b_channel_equalization_sequence(link,
link_res,
lt_settings,
DPRX);
}
}
return status;
}
enum link_training_result dp_perform_fixed_vs_pe_training_sequence(
struct dc_link *link,
const struct link_resource *link_res,
struct link_training_settings *lt_settings)
{
const uint8_t vendor_lttpr_write_data_reset[4] = {0x1, 0x50, 0x63, 0xFF};
const uint8_t offset = dp_convert_to_count(
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->dc->debug.fixed_vs_aux_delay_config_wa;
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;
enum link_training_result status = LINK_TRAINING_SUCCESS;
uint8_t lane = 0;
union down_spread_ctrl downspread = {0};
union lane_count_set lane_count_set = {0};
uint8_t toggle_rate;
uint8_t rate;
/* Only 8b/10b is supported */
ASSERT(dp_get_link_encoding_format(&lt_settings->link_settings) ==
DP_8b_10b_ENCODING);
if (lt_settings->lttpr_mode == LTTPR_MODE_NON_TRANSPARENT) {
status = perform_fixed_vs_pe_nontransparent_training_sequence(link, link_res, lt_settings);
return status;
}
if (offset != 0xFF) {
vendor_lttpr_write_address +=
((DP_REPEATER_CONFIGURATION_AND_STATUS_SIZE) * (offset - 1));
/* Certain display and cable configuration require extra delay */
if (offset > 2)
pre_disable_intercept_delay_ms = link->dc->debug.fixed_vs_aux_delay_config_wa * 2;
}
/* Vendor specific: Reset lane settings */
core_link_write_dpcd(
link,
vendor_lttpr_write_address,
&vendor_lttpr_write_data_reset[0],
sizeof(vendor_lttpr_write_data_reset));
core_link_write_dpcd(
link,
vendor_lttpr_write_address,
&vendor_lttpr_write_data_vs[0],
sizeof(vendor_lttpr_write_data_vs));
core_link_write_dpcd(
link,
vendor_lttpr_write_address,
&vendor_lttpr_write_data_pe[0],
sizeof(vendor_lttpr_write_data_pe));
/* Vendor specific: Enable intercept */
core_link_write_dpcd(
link,
vendor_lttpr_write_address,
&vendor_lttpr_write_data_intercept_en[0],
sizeof(vendor_lttpr_write_data_intercept_en));
/* 1. set link rate, lane count and spread. */
downspread.raw = (uint8_t)(lt_settings->link_settings.link_spread);
lane_count_set.bits.LANE_COUNT_SET =
lt_settings->link_settings.lane_count;
lane_count_set.bits.ENHANCED_FRAMING = lt_settings->enhanced_framing;
lane_count_set.bits.POST_LT_ADJ_REQ_GRANTED = 0;
if (lt_settings->pattern_for_eq < DP_TRAINING_PATTERN_SEQUENCE_4) {
lane_count_set.bits.POST_LT_ADJ_REQ_GRANTED =
link->dpcd_caps.max_ln_count.bits.POST_LT_ADJ_REQ_SUPPORTED;
}
core_link_write_dpcd(link, DP_DOWNSPREAD_CTRL,
&downspread.raw, sizeof(downspread));
core_link_write_dpcd(link, DP_LANE_COUNT_SET,
&lane_count_set.raw, 1);
rate = get_dpcd_link_rate(&lt_settings->link_settings);
/* Vendor specific: Toggle link rate */
toggle_rate = (rate == 0x6) ? 0xA : 0x6;
if (link->vendor_specific_lttpr_link_rate_wa == rate) {
core_link_write_dpcd(
link,
DP_LINK_BW_SET,
&toggle_rate,
1);
}
link->vendor_specific_lttpr_link_rate_wa = rate;
core_link_write_dpcd(link, DP_LINK_BW_SET, &rate, 1);
DC_LOG_HW_LINK_TRAINING("%s\n %x rate = %x\n %x lane = %x framing = %x\n %x spread = %x\n",
__func__,
DP_LINK_BW_SET,
lt_settings->link_settings.link_rate,
DP_LANE_COUNT_SET,
lt_settings->link_settings.lane_count,
lt_settings->enhanced_framing,
DP_DOWNSPREAD_CTRL,
lt_settings->link_settings.link_spread);
/* 2. Perform link training */
/* Perform Clock Recovery Sequence */
if (status == LINK_TRAINING_SUCCESS) {
const uint8_t max_vendor_dpcd_retries = 10;
uint32_t retries_cr;
uint32_t retry_count;
uint32_t wait_time_microsec;
enum dc_lane_count lane_count = lt_settings->link_settings.lane_count;
union lane_status dpcd_lane_status[LANE_COUNT_DP_MAX];
union lane_align_status_updated dpcd_lane_status_updated;
union lane_adjust dpcd_lane_adjust[LANE_COUNT_DP_MAX] = {0};
enum dc_status dpcd_status = DC_OK;
uint8_t i = 0;
retries_cr = 0;
retry_count = 0;
memset(&dpcd_lane_status, '\0', sizeof(dpcd_lane_status));
memset(&dpcd_lane_status_updated, '\0',
sizeof(dpcd_lane_status_updated));
while ((retries_cr < LINK_TRAINING_MAX_RETRY_COUNT) &&
(retry_count < LINK_TRAINING_MAX_CR_RETRY)) {
/* 1. call HWSS to set lane settings */
dp_set_hw_lane_settings(
link,
link_res,
lt_settings,
0);
/* 2. update DPCD of the receiver */
if (!retry_count) {
/* EPR #361076 - write as a 5-byte burst,
* but only for the 1-st iteration.
*/
dpcd_set_lt_pattern_and_lane_settings(
link,
lt_settings,
lt_settings->pattern_for_cr,
0);
/* Vendor specific: Disable intercept */
for (i = 0; i < max_vendor_dpcd_retries; i++) {
msleep(pre_disable_intercept_delay_ms);
dpcd_status = core_link_write_dpcd(
link,
vendor_lttpr_write_address,
&vendor_lttpr_write_data_intercept_dis[0],
sizeof(vendor_lttpr_write_data_intercept_dis));
if (dpcd_status == DC_OK)
break;
core_link_write_dpcd(
link,
vendor_lttpr_write_address,
&vendor_lttpr_write_data_intercept_en[0],
sizeof(vendor_lttpr_write_data_intercept_en));
}
} else {
vendor_lttpr_write_data_vs[3] = 0;
vendor_lttpr_write_data_pe[3] = 0;
for (lane = 0; lane < lane_count; lane++) {
vendor_lttpr_write_data_vs[3] |=
lt_settings->dpcd_lane_settings[lane].bits.VOLTAGE_SWING_SET << (2 * lane);
vendor_lttpr_write_data_pe[3] |=
lt_settings->dpcd_lane_settings[lane].bits.PRE_EMPHASIS_SET << (2 * lane);
}
/* Vendor specific: Update VS and PE to DPRX requested value */
core_link_write_dpcd(
link,
vendor_lttpr_write_address,
&vendor_lttpr_write_data_vs[0],
sizeof(vendor_lttpr_write_data_vs));
core_link_write_dpcd(
link,
vendor_lttpr_write_address,
&vendor_lttpr_write_data_pe[0],
sizeof(vendor_lttpr_write_data_pe));
dpcd_set_lane_settings(
link,
lt_settings,
0);
}
/* 3. wait receiver to lock-on*/
wait_time_microsec = lt_settings->cr_pattern_time;
dp_wait_for_training_aux_rd_interval(
link,
wait_time_microsec);
/* 4. Read lane status and requested drive
* settings as set by the sink
*/
dp_get_lane_status_and_lane_adjust(
link,
lt_settings,
dpcd_lane_status,
&dpcd_lane_status_updated,
dpcd_lane_adjust,
0);
/* 5. check CR done*/
if (dp_is_cr_done(lane_count, dpcd_lane_status)) {
status = LINK_TRAINING_SUCCESS;
break;
}
/* 6. max VS reached*/
if (dp_is_max_vs_reached(lt_settings))
break;
/* 7. same lane settings */
/* Note: settings are the same for all lanes,
* so comparing first lane is sufficient
*/
if (lt_settings->dpcd_lane_settings[0].bits.VOLTAGE_SWING_SET ==
dpcd_lane_adjust[0].bits.VOLTAGE_SWING_LANE)
retries_cr++;
else
retries_cr = 0;
/* 8. update VS/PE/PC2 in lt_settings*/
dp_decide_lane_settings(lt_settings, dpcd_lane_adjust,
lt_settings->hw_lane_settings, lt_settings->dpcd_lane_settings);
retry_count++;
}
if (retry_count >= LINK_TRAINING_MAX_CR_RETRY) {
ASSERT(0);
DC_LOG_ERROR("%s: Link Training Error, could not get CR after %d tries. Possibly voltage swing issue",
__func__,
LINK_TRAINING_MAX_CR_RETRY);
}
status = dp_get_cr_failure(lane_count, dpcd_lane_status);
}
/* Perform Channel EQ Sequence */
if (status == LINK_TRAINING_SUCCESS) {
enum dc_dp_training_pattern tr_pattern;
uint32_t retries_ch_eq;
uint32_t wait_time_microsec;
enum dc_lane_count lane_count = lt_settings->link_settings.lane_count;
union lane_align_status_updated dpcd_lane_status_updated = {0};
union lane_status dpcd_lane_status[LANE_COUNT_DP_MAX] = {0};
union lane_adjust dpcd_lane_adjust[LANE_COUNT_DP_MAX] = {0};
/* Note: also check that TPS4 is a supported feature*/
tr_pattern = lt_settings->pattern_for_eq;
dp_set_hw_training_pattern(link, link_res, tr_pattern, 0);
status = LINK_TRAINING_EQ_FAIL_EQ;
for (retries_ch_eq = 0; retries_ch_eq <= LINK_TRAINING_MAX_RETRY_COUNT;
retries_ch_eq++) {
dp_set_hw_lane_settings(link, link_res, lt_settings, 0);
vendor_lttpr_write_data_vs[3] = 0;
vendor_lttpr_write_data_pe[3] = 0;
for (lane = 0; lane < lane_count; lane++) {
vendor_lttpr_write_data_vs[3] |=
lt_settings->dpcd_lane_settings[lane].bits.VOLTAGE_SWING_SET << (2 * lane);
vendor_lttpr_write_data_pe[3] |=
lt_settings->dpcd_lane_settings[lane].bits.PRE_EMPHASIS_SET << (2 * lane);
}
/* Vendor specific: Update VS and PE to DPRX requested value */
core_link_write_dpcd(
link,
vendor_lttpr_write_address,
&vendor_lttpr_write_data_vs[0],
sizeof(vendor_lttpr_write_data_vs));
core_link_write_dpcd(
link,
vendor_lttpr_write_address,
&vendor_lttpr_write_data_pe[0],
sizeof(vendor_lttpr_write_data_pe));
/* 2. update DPCD*/
if (!retries_ch_eq)
/* EPR #361076 - write as a 5-byte burst,
* but only for the 1-st iteration
*/
dpcd_set_lt_pattern_and_lane_settings(
link,
lt_settings,
tr_pattern, 0);
else
dpcd_set_lane_settings(link, lt_settings, 0);
/* 3. wait for receiver to lock-on*/
wait_time_microsec = lt_settings->eq_pattern_time;
dp_wait_for_training_aux_rd_interval(
link,
wait_time_microsec);
/* 4. Read lane status and requested
* drive settings as set by the sink
*/
dp_get_lane_status_and_lane_adjust(
link,
lt_settings,
dpcd_lane_status,
&dpcd_lane_status_updated,
dpcd_lane_adjust,
0);
/* 5. check CR done*/
if (!dp_is_cr_done(lane_count, dpcd_lane_status)) {
status = LINK_TRAINING_EQ_FAIL_CR;
break;
}
/* 6. check CHEQ done*/
if (dp_is_ch_eq_done(lane_count, dpcd_lane_status) &&
dp_is_symbol_locked(lane_count, dpcd_lane_status) &&
dp_is_interlane_aligned(dpcd_lane_status_updated)) {
status = LINK_TRAINING_SUCCESS;
break;
}
/* 7. update VS/PE/PC2 in lt_settings*/
dp_decide_lane_settings(lt_settings, dpcd_lane_adjust,
lt_settings->hw_lane_settings, lt_settings->dpcd_lane_settings);
}
}
return status;
}

45
drivers/gpu/drm/amd/display/dc/link/link_dp_training_fixed_vs_pe_retimer.h Normal file
View File

@ -0,0 +1,45 @@
/*
* Copyright 2022 Advanced Micro Devices, Inc.
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
* OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
* ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
* OTHER DEALINGS IN THE SOFTWARE.
*
* Authors: AMD
*
*/
#ifndef __DC_LINK_DP_FIXED_VS_PE_RETIMER_H__
#define __DC_LINK_DP_FIXED_VS_PE_RETIMER_H__
#include "link_dp_training.h"
enum link_training_result dp_perform_fixed_vs_pe_training_sequence(
struct dc_link *link,
const struct link_resource *link_res,
struct link_training_settings *lt_settings);
void dp_fixed_vs_pe_set_retimer_lane_settings(
struct dc_link *link,
const union dpcd_training_lane dpcd_lane_adjust[LANE_COUNT_DP_MAX],
uint8_t lane_count);
void dp_fixed_vs_pe_read_lane_adjust(
struct dc_link *link,
union dpcd_training_lane dpcd_lane_adjust[LANE_COUNT_DP_MAX]);
#endif /* __DC_LINK_DP_FIXED_VS_PE_RETIMER_H__ */

1
drivers/gpu/drm/amd/display/dc/link/link_dpcd.h
View File

@ -26,6 +26,7 @@
#ifndef __LINK_DPCD_H__
#define __LINK_DPCD_H__
#include "link.h"
#include "dpcd_defs.h"
enum dc_status core_link_read_dpcd(
struct dc_link *link,

5
drivers/gpu/drm/amd/display/include/ddc_service_types.h
View File

@ -133,6 +133,11 @@ static const uint8_t DP_SINK_DEVICE_STR_ID_2[] = {7, 1, 8, 7, 5};
static const u8 DP_SINK_BRANCH_DEV_NAME_7580[] = "7580\x80u";
/*Travis*/
static const uint8_t DP_VGA_LVDS_CONVERTER_ID_2[] = "sivarT";
/*Nutmeg*/
static const uint8_t DP_VGA_LVDS_CONVERTER_ID_3[] = "dnomlA";
/*MST Dock*/
static const uint8_t SYNAPTICS_DEVICE_ID[] = "SYNA";