From: abdoulaye berthe <abdoulaye.berthe@xxxxxxx>
1-If at least one repeater is present in the link and we are in non
transparent mode, perform clock recovery then channel equalization
with all repeaters one by one before training DPRX.
2-Mark the end of LT with a repeater by setting training pattern 0
at the end of channel equalization with each repeater.
Signed-off-by: abdoulaye berthe <abdoulaye.berthe@xxxxxxx>
Reviewed-by: Aric Cyr <Aric.Cyr@xxxxxxx>
---
.../gpu/drm/amd/display/dc/core/dc_link_dp.c | 319 ++++++++++++++----
.../drm/amd/display/dc/core/dc_link_hwss.c | 39 ++-
.../gpu/drm/amd/display/dc/inc/link_hwss.h | 6 +-
3 files changed, 292 insertions(+), 72 deletions(-)
diff --git a/drivers/gpu/drm/amd/display/dc/core/dc_link_dp.c b/drivers/gpu/drm/amd/display/dc/core/dc_link_dp.c
index 94d5a0ac308f..11b6e14b345e 100644
--- a/drivers/gpu/drm/amd/display/dc/core/dc_link_dp.c
+++ b/drivers/gpu/drm/amd/display/dc/core/dc_link_dp.c
@@ -22,7 +22,7 @@
link->ctx->logger
-#define DP_REPEATER_CONFIGURATION_AND_STATUS_OFFSET 0x50
+#define DP_REPEATER_CONFIGURATION_AND_STATUS_SIZE 0x50
/* maximum pre emphasis level allowed for each voltage swing level*/
static const enum dc_pre_emphasis voltage_swing_to_pre_emphasis[] = {
@@ -224,19 +224,31 @@ static enum dpcd_training_patterns
return dpcd_tr_pattern;
}
+static inline bool is_repeater(struct dc_link *link, uint32_t offset)
+{
+ return (!link->is_lttpr_mode_transparent && offset != 0);
+}
+
static 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)
+ enum dc_dp_training_pattern pattern,
+ uint32_t offset)
{
union dpcd_training_lane dpcd_lane[LANE_COUNT_DP_MAX] = { { {0} } };
- const uint32_t dpcd_base_lt_offset =
- DP_TRAINING_PATTERN_SET;
+
+ uint32_t dpcd_base_lt_offset;
+
uint8_t dpcd_lt_buffer[5] = {0};
union dpcd_training_pattern dpcd_pattern = { {0} };
uint32_t lane;
uint32_t size_in_bytes;
bool edp_workaround = false; /* TODO link_prop.INTERNAL */
+ dpcd_base_lt_offset = DP_TRAINING_PATTERN_SET;
+
+ if (is_repeater(link, offset))
+ dpcd_base_lt_offset = DP_TRAINING_PATTERN_SET_PHY_REPEATER1 +
+ ((DP_REPEATER_CONFIGURATION_AND_STATUS_SIZE) * (offset - 1));
/*****************************************************************
* DpcdAddress_TrainingPatternSet
@@ -244,12 +256,12 @@ static void dpcd_set_lt_pattern_and_lane_settings(
dpcd_pattern.v1_4.TRAINING_PATTERN_SET =
dc_dp_training_pattern_to_dpcd_training_pattern(link, pattern);
- dpcd_lt_buffer[DP_TRAINING_PATTERN_SET - dpcd_base_lt_offset]
+ dpcd_lt_buffer[DP_TRAINING_PATTERN_SET - DP_TRAINING_PATTERN_SET]
= dpcd_pattern.raw;
- DC_LOG_HW_LINK_TRAINING("%s\n %x pattern = %x\n",
+ DC_LOG_HW_LINK_TRAINING("%s\n 0x%X pattern = %x\n",
__func__,
- DP_TRAINING_PATTERN_SET,
+ dpcd_base_lt_offset,
dpcd_pattern.v1_4.TRAINING_PATTERN_SET);
/*****************************************************************
@@ -271,19 +283,19 @@ static void dpcd_set_lt_pattern_and_lane_settings(
PRE_EMPHASIS_MAX_LEVEL ? 1 : 0);
}
- /* concatinate everything into one buffer*/
+ /* concatenate everything into one buffer*/
size_in_bytes = lt_settings->link_settings.lane_count * sizeof(dpcd_lane[0]);
// 0x00103 - 0x00102
memmove(
- &dpcd_lt_buffer[DP_TRAINING_LANE0_SET - dpcd_base_lt_offset],
+ &dpcd_lt_buffer[DP_TRAINING_LANE0_SET - DP_TRAINING_PATTERN_SET],
dpcd_lane,
size_in_bytes);
- DC_LOG_HW_LINK_TRAINING("%s:\n %x VS set = %x PE set = %x max VS Reached = %x max PE Reached = %x\n",
+ DC_LOG_HW_LINK_TRAINING("%s:\n 0x%X VS set = %x PE set = %x max VS Reached = %x max PE Reached = %x\n",
__func__,
- DP_TRAINING_LANE0_SET,
+ dpcd_base_lt_offset,
dpcd_lane[0].bits.VOLTAGE_SWING_SET,
dpcd_lane[0].bits.PRE_EMPHASIS_SET,
dpcd_lane[0].bits.MAX_SWING_REACHED,
@@ -498,8 +510,12 @@ static void get_lane_status_and_drive_settings(
const struct link_training_settings *link_training_setting,
union lane_status *ln_status,
union lane_align_status_updated *ln_status_updated,
- struct link_training_settings *req_settings)
+ struct link_training_settings *req_settings,
+ uint32_t offset)
{
+ unsigned int lane01_status_address = DP_LANE0_1_STATUS;
+ uint8_t lane_adjust_offset = 4;
+ unsigned int lane01_adjust_address;
uint8_t dpcd_buf[6] = {0};
union lane_adjust dpcd_lane_adjust[LANE_COUNT_DP_MAX] = { { {0} } };
struct link_training_settings request_settings = { {0} };
@@ -507,9 +523,16 @@ static void get_lane_status_and_drive_settings(
memset(req_settings, '\0', sizeof(struct link_training_settings));
+ if (is_repeater(link, offset)) {
+ lane01_status_address =
+ DP_LANE0_1_STATUS_PHY_REPEATER1 +
+ ((DP_REPEATER_CONFIGURATION_AND_STATUS_SIZE) * (offset - 1));
+ lane_adjust_offset = 3;
+ }
+
core_link_read_dpcd(
link,
- DP_LANE0_1_STATUS,
+ lane01_status_address,
(uint8_t *)(dpcd_buf),
sizeof(dpcd_buf));
@@ -520,22 +543,28 @@ static void get_lane_status_and_drive_settings(
ln_status[lane].raw =
get_nibble_at_index(&dpcd_buf[0], lane);
dpcd_lane_adjust[lane].raw =
- get_nibble_at_index(&dpcd_buf[4], lane);
+ get_nibble_at_index(&dpcd_buf[lane_adjust_offset], lane);
}
ln_status_updated->raw = dpcd_buf[2];
- DC_LOG_HW_LINK_TRAINING("%s:\n%x Lane01Status = %x\n %x Lane23Status = %x\n ",
+ DC_LOG_HW_LINK_TRAINING("%s:\n 0x%X Lane01Status = %x\n 0x%X Lane23Status = %x\n ",
__func__,
- DP_LANE0_1_STATUS, dpcd_buf[0],
- DP_LANE2_3_STATUS, dpcd_buf[1]);
+ lane01_status_address, dpcd_buf[0],
+ lane01_status_address + 1, dpcd_buf[1]);
+
+ lane01_adjust_address = DP_ADJUST_REQUEST_LANE0_1;
+
+ if (is_repeater(link, offset))
+ lane01_adjust_address = DP_ADJUST_REQUEST_LANE0_1_PHY_REPEATER1 +
+ ((DP_REPEATER_CONFIGURATION_AND_STATUS_SIZE) * (offset - 1));
- DC_LOG_HW_LINK_TRAINING("%s:\n %x Lane01AdjustRequest = %x\n %x Lane23AdjustRequest = %x\n",
+ DC_LOG_HW_LINK_TRAINING("%s:\n 0x%X Lane01AdjustRequest = %x\n 0x%X Lane23AdjustRequest = %x\n",
__func__,
- DP_ADJUST_REQUEST_LANE0_1,
- dpcd_buf[4],
- DP_ADJUST_REQUEST_LANE2_3,
- dpcd_buf[5]);
+ lane01_adjust_address,
+ dpcd_buf[lane_adjust_offset],
+ lane01_adjust_address + 1,
+ dpcd_buf[lane_adjust_offset + 1]);
/*copy to req_settings*/
request_settings.link_settings.lane_count =
@@ -574,10 +603,18 @@ static void get_lane_status_and_drive_settings(
static void dpcd_set_lane_settings(
struct dc_link *link,
- const struct link_training_settings *link_training_setting)
+ const struct link_training_settings *link_training_setting,
+ uint32_t offset)
{
union dpcd_training_lane dpcd_lane[LANE_COUNT_DP_MAX] = {{{0}}};
uint32_t lane;
+ unsigned int lane0_set_address;
+
+ lane0_set_address = DP_TRAINING_LANE0_SET;
+
+ if (is_repeater(link, offset))
+ lane0_set_address = DP_TRAINING_LANE0_SET_PHY_REPEATER1 +
+ ((DP_REPEATER_CONFIGURATION_AND_STATUS_SIZE) * (offset - 1));
for (lane = 0; lane <
(uint32_t)(link_training_setting->
@@ -600,7 +637,7 @@ static void dpcd_set_lane_settings(
}
core_link_write_dpcd(link,
- DP_TRAINING_LANE0_SET,
+ lane0_set_address,
(uint8_t *)(dpcd_lane),
link_training_setting->link_settings.lane_count);
@@ -623,9 +660,9 @@ static void dpcd_set_lane_settings(
}
*/
- DC_LOG_HW_LINK_TRAINING("%s\n %x VS set = %x PE set = %x max VS Reached = %x max PE Reached = %x\n",
+ DC_LOG_HW_LINK_TRAINING("%s\n 0x%X VS set = %x PE set = %x max VS Reached = %x max PE Reached = %x\n",
__func__,
- DP_TRAINING_LANE0_SET,
+ lane0_set_address,
dpcd_lane[0].bits.VOLTAGE_SWING_SET,
dpcd_lane[0].bits.PRE_EMPHASIS_SET,
dpcd_lane[0].bits.MAX_SWING_REACHED,
@@ -650,17 +687,6 @@ static bool is_max_vs_reached(
}
-void dc_link_dp_set_drive_settings(
- struct dc_link *link,
- struct link_training_settings *lt_settings)
-{
- /* program ASIC PHY settings*/
- dp_set_hw_lane_settings(link, lt_settings);
-
- /* Notify DP sink the PHY settings from source */
- dpcd_set_lane_settings(link, lt_settings);
-}
-
static bool perform_post_lt_adj_req_sequence(
struct dc_link *link,
struct link_training_settings *lt_settings)
@@ -693,7 +719,8 @@ static bool perform_post_lt_adj_req_sequence(
lt_settings,
dpcd_lane_status,
&dpcd_lane_status_updated,
- &req_settings);
+ &req_settings,
+ DPRX);
if (dpcd_lane_status_updated.bits.
POST_LT_ADJ_REQ_IN_PROGRESS == 0)
@@ -750,6 +777,31 @@ static bool perform_post_lt_adj_req_sequence(
}
+/* Only used for channel equalization */
+static uint32_t translate_training_aux_read_interval(uint32_t dpcd_aux_read_interval)
+{
+ unsigned int aux_rd_interval_us = 400;
+
+ switch (dpcd_aux_read_interval) {
+ case 0x01:
+ aux_rd_interval_us = 400;
+ break;
+ case 0x02:
+ aux_rd_interval_us = 4000;
+ break;
+ case 0x03:
+ aux_rd_interval_us = 8000;
+ break;
+ case 0x04:
+ aux_rd_interval_us = 16000;
+ break;
+ default:
+ break;
+ }
+
+ return aux_rd_interval_us;
+}
+
static enum link_training_result get_cr_failure(enum dc_lane_count ln_count,
union lane_status *dpcd_lane_status)
{
@@ -768,37 +820,55 @@ static enum link_training_result get_cr_failure(enum dc_lane_count ln_count,
static enum link_training_result perform_channel_equalization_sequence(
struct dc_link *link,
- struct link_training_settings *lt_settings)
+ struct link_training_settings *lt_settings,
+ uint32_t offset)
{
struct link_training_settings req_settings;
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} } };
+ /* Note: also check that TPS4 is a supported feature*/
+
tr_pattern = lt_settings->pattern_for_eq;
- dp_set_hw_training_pattern(link, tr_pattern);
+ if (is_repeater(link, offset))
+ tr_pattern = DP_TRAINING_PATTERN_SEQUENCE_4;
+
+ dp_set_hw_training_pattern(link, 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, lt_settings);
+ dp_set_hw_lane_settings(link, 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*/
+ * but only for the 1-st iteration
+ */
+
dpcd_set_lt_pattern_and_lane_settings(
link,
lt_settings,
- tr_pattern);
+ tr_pattern, offset);
else
- dpcd_set_lane_settings(link, lt_settings);
+ dpcd_set_lane_settings(link, lt_settings, offset);
/* 3. wait for receiver to lock-on*/
- wait_for_training_aux_rd_interval(link, lt_settings->eq_pattern_time);
+ wait_time_microsec = lt_settings->eq_pattern_time;
+
+ if (!link->is_lttpr_mode_transparent)
+ wait_time_microsec =
+ translate_training_aux_read_interval(
+ link->dpcd_caps.lttpr_caps.aux_rd_interval[offset]);
+
+ wait_for_training_aux_rd_interval(
+ link,
+ wait_time_microsec);
/* 4. Read lane status and requested
* drive settings as set by the sink*/
@@ -808,7 +878,8 @@ static enum link_training_result perform_channel_equalization_sequence(
lt_settings,
dpcd_lane_status,
&dpcd_lane_status_updated,
- &req_settings);
+ &req_settings,
+ offset);
/* 5. check CR done*/
if (!is_cr_done(lane_count, dpcd_lane_status))
@@ -827,13 +898,16 @@ static enum link_training_result perform_channel_equalization_sequence(
return LINK_TRAINING_EQ_FAIL_EQ;
}
+#define TRAINING_AUX_RD_INTERVAL 100 //us
static enum link_training_result perform_clock_recovery_sequence(
struct dc_link *link,
- struct link_training_settings *lt_settings)
+ struct link_training_settings *lt_settings,
+ uint32_t offset)
{
uint32_t retries_cr;
uint32_t retry_count;
+ uint32_t wait_time_microsec;
struct link_training_settings req_settings;
enum dc_lane_count lane_count = lt_settings->link_settings.lane_count;
enum dc_dp_training_pattern tr_pattern = DP_TRAINING_PATTERN_SEQUENCE_1;
@@ -843,7 +917,7 @@ static enum link_training_result perform_clock_recovery_sequence(
retries_cr = 0;
retry_count = 0;
- dp_set_hw_training_pattern(link, tr_pattern);
+ dp_set_hw_training_pattern(link, tr_pattern, offset);
/* najeeb - The synaptics MST hub can put the LT in
* infinite loop by switching the VS
@@ -860,7 +934,8 @@ static enum link_training_result perform_clock_recovery_sequence(
/* 1. call HWSS to set lane settings*/
dp_set_hw_lane_settings(
link,
- lt_settings);
+ lt_settings,
+ offset);
/* 2. update DPCD of the receiver*/
if (!retries_cr)
@@ -869,16 +944,23 @@ static enum link_training_result perform_clock_recovery_sequence(
dpcd_set_lt_pattern_and_lane_settings(
link,
lt_settings,
- tr_pattern);
+ tr_pattern,
+ offset);
else
dpcd_set_lane_settings(
link,
- lt_settings);
+ lt_settings,
+ offset);
/* 3. wait receiver to lock-on*/
+ wait_time_microsec = lt_settings->cr_pattern_time;
+
+ if (!link->is_lttpr_mode_transparent)
+ wait_time_microsec = TRAINING_AUX_RD_INTERVAL;
+
wait_for_training_aux_rd_interval(
link,
- lt_settings->cr_pattern_time);
+ wait_time_microsec);
/* 4. Read lane status and requested drive
* settings as set by the sink
@@ -888,7 +970,8 @@ static enum link_training_result perform_clock_recovery_sequence(
lt_settings,
dpcd_lane_status,
&dpcd_lane_status_updated,
- &req_settings);
+ &req_settings,
+ offset);
/* 5. check CR done*/
if (is_cr_done(lane_count, dpcd_lane_status))
@@ -1057,10 +1140,38 @@ static void initialize_training_settings(
lt_settings->enhanced_framing = 1;
}
+static uint8_t convert_to_count(uint8_t lttpr_repeater_count)
+{
+ switch (lttpr_repeater_count) {
+ case 0x80: // 1 lttpr repeater
+ return 1;
+ case 0x40: // 2 lttpr repeaters
+ return 2;
+ case 0x20: // 3 lttpr repeaters
+ return 3;
+ case 0x10: // 4 lttpr repeaters
+ return 4;
+ case 0x08: // 5 lttpr repeaters
+ return 5;
+ case 0x04: // 6 lttpr repeaters
+ return 6;
+ case 0x02: // 7 lttpr repeaters
+ return 7;
+ case 0x01: // 8 lttpr repeaters
+ return 8;
+ default:
+ break;
+ }
+ return 0; // invalid value
+}
+
static void configure_lttpr_mode(struct dc_link *link)
{
/* aux timeout is already set to extended */
/* RESET/SET lttpr mode to enable non transparent mode */
+ uint8_t repeater_cnt;
+ uint32_t aux_interval_address;
+ uint8_t repeater_id;
enum lttpr_mode repeater_mode = phy_repeater_mode_transparent;
core_link_write_dpcd(link,
@@ -1074,9 +1185,43 @@ static void configure_lttpr_mode(struct dc_link *link)
DP_PHY_REPEATER_MODE,
(uint8_t *)&repeater_mode,
sizeof(repeater_mode));
+
+ repeater_cnt = convert_to_count(link->dpcd_caps.lttpr_caps.phy_repeater_cnt);
+ for (repeater_id = repeater_cnt; repeater_id > 0; repeater_id--) {
+ aux_interval_address = DP_TRAINING_AUX_RD_INTERVAL_PHY_REPEATER1 +
+ ((DP_REPEATER_CONFIGURATION_AND_STATUS_SIZE) * (repeater_id - 1));
+ core_link_read_dpcd(
+ link,
+ aux_interval_address,
+ (uint8_t *)&link->dpcd_caps.lttpr_caps.aux_rd_interval[repeater_id - 1],
+ sizeof(link->dpcd_caps.lttpr_caps.aux_rd_interval[repeater_id - 1]));
+ link->dpcd_caps.lttpr_caps.aux_rd_interval[repeater_id - 1] &= 0x7F;
+ }
}
}
+static void repeater_training_done(struct dc_link *link, uint32_t offset)
+{
+ union dpcd_training_pattern dpcd_pattern = { {0} };
+
+ const uint32_t dpcd_base_lt_offset =
+ DP_TRAINING_PATTERN_SET_PHY_REPEATER1 +
+ ((DP_REPEATER_CONFIGURATION_AND_STATUS_SIZE) * (offset - 1));
+ /* Set training not in progress*/
+ dpcd_pattern.v1_4.TRAINING_PATTERN_SET = DPCD_TRAINING_PATTERN_VIDEOIDLE;
+
+ core_link_write_dpcd(
+ link,
+ dpcd_base_lt_offset,
+ &dpcd_pattern.raw,
+ 1);
+
+ DC_LOG_HW_LINK_TRAINING("%s\n 0x%X pattern = %x\n",
+ __func__,
+ dpcd_base_lt_offset,
+ dpcd_pattern.v1_4.TRAINING_PATTERN_SET);
+}
+
static void print_status_message(
struct dc_link *link,
const struct link_training_settings *lt_settings,
@@ -1156,6 +1301,17 @@ static void print_status_message(
lt_spread);
}
+void dc_link_dp_set_drive_settings(
+ struct dc_link *link,
+ struct link_training_settings *lt_settings)
+{
+ /* program ASIC PHY settings*/
+ dp_set_hw_lane_settings(link, lt_settings, DPRX);
+
+ /* Notify DP sink the PHY settings from source */
+ dpcd_set_lane_settings(link, lt_settings, DPRX);
+}
+
bool dc_link_dp_perform_link_training_skip_aux(
struct dc_link *link,
const struct dc_link_settings *link_setting)
@@ -1172,10 +1328,10 @@ bool dc_link_dp_perform_link_training_skip_aux(
/* 1. Perform_clock_recovery_sequence. */
/* transmit training pattern for clock recovery */
- dp_set_hw_training_pattern(link, pattern_for_cr);
+ dp_set_hw_training_pattern(link, pattern_for_cr, DPRX);
/* call HWSS to set lane settings*/
- dp_set_hw_lane_settings(link, <_settings);
+ dp_set_hw_lane_settings(link, <_settings, DPRX);
/* wait receiver to lock-on*/
wait_for_training_aux_rd_interval(link, lt_settings.cr_pattern_time);
@@ -1183,10 +1339,10 @@ bool dc_link_dp_perform_link_training_skip_aux(
/* 2. Perform_channel_equalization_sequence. */
/* transmit training pattern for channel equalization. */
- dp_set_hw_training_pattern(link, lt_settings.pattern_for_eq);
+ dp_set_hw_training_pattern(link, lt_settings.pattern_for_eq, DPRX);
/* call HWSS to set lane settings*/
- dp_set_hw_lane_settings(link, <_settings);
+ dp_set_hw_lane_settings(link, <_settings, DPRX);
/* wait receiver to lock-on. */
wait_for_training_aux_rd_interval(link, lt_settings.eq_pattern_time);
@@ -1208,9 +1364,12 @@ enum link_training_result dc_link_dp_perform_link_training(
{
enum link_training_result status = LINK_TRAINING_SUCCESS;
struct link_training_settings lt_settings;
+
#ifdef CONFIG_DRM_AMD_DC_DSC_SUPPORT
bool fec_enable;
#endif
+ uint8_t repeater_cnt;
+ uint8_t repeater_id;
initialize_training_settings(
link,
@@ -1230,17 +1389,40 @@ enum link_training_result dc_link_dp_perform_link_training(
dp_set_fec_ready(link, fec_enable);
#endif
- /* Configure lttpr mode */
- if (!link->is_lttpr_mode_transparent)
+ if (!link->is_lttpr_mode_transparent) {
+ /* Configure lttpr mode */
configure_lttpr_mode(link);
- /* 2. perform link training (set link training done
- * to false is done as well)
- */
- status = perform_clock_recovery_sequence(link, <_settings);
+ /* 2. perform link training (set link training done
+ * to false is done as well)
+ */
+ repeater_cnt = 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_clock_recovery_sequence(link, <_settings, repeater_id);
+
+ if (status != LINK_TRAINING_SUCCESS)
+ break;
+
+ status = perform_channel_equalization_sequence(link,
+ <_settings,
+ repeater_id);
+
+ if (status != LINK_TRAINING_SUCCESS)
+ break;
+
+ repeater_training_done(link, repeater_id);
+ }
+ }
+
+ if (status == LINK_TRAINING_SUCCESS) {
+ status = perform_clock_recovery_sequence(link, <_settings, DPRX);
if (status == LINK_TRAINING_SUCCESS) {
status = perform_channel_equalization_sequence(link,
- <_settings);
+ <_settings,
+ DPRX);
+ }
}
if ((status == LINK_TRAINING_SUCCESS) || !skip_video_pattern) {
@@ -1393,10 +1575,11 @@ enum link_training_result dc_link_dp_sync_lt_attempt(
/* 2. perform link training (set link training done
* to false is done as well)
*/
- lt_status = perform_clock_recovery_sequence(link, <_settings);
+ lt_status = perform_clock_recovery_sequence(link, <_settings, DPRX);
if (lt_status == LINK_TRAINING_SUCCESS) {
lt_status = perform_channel_equalization_sequence(link,
- <_settings);
+ <_settings,
+ DPRX);
}
/* 3. Sync LT must skip TRAINING_PATTERN_SET:0 (video pattern)*/
@@ -3355,8 +3538,8 @@ bool dc_link_dp_set_test_pattern(
if (is_dp_phy_pattern(test_pattern)) {
/* Set DPCD Lane Settings before running test pattern */
if (p_link_settings != NULL) {
- dp_set_hw_lane_settings(link, p_link_settings);
- dpcd_set_lane_settings(link, p_link_settings);
+ dp_set_hw_lane_settings(link, p_link_settings, DPRX);
+ dpcd_set_lane_settings(link, p_link_settings, DPRX);
}
/* Blank stream if running test pattern */
diff --git a/drivers/gpu/drm/amd/display/dc/core/dc_link_hwss.c b/drivers/gpu/drm/amd/display/dc/core/dc_link_hwss.c
index a519dbc5ecb6..5efbdc1eb173 100644
--- a/drivers/gpu/drm/amd/display/dc/core/dc_link_hwss.c
+++ b/drivers/gpu/drm/amd/display/dc/core/dc_link_hwss.c
@@ -19,6 +19,36 @@
#include "resource.h"
#endif
+static uint8_t convert_to_count(uint8_t lttpr_repeater_count)
+{
+ switch (lttpr_repeater_count) {
+ case 0x80: // 1 lttpr repeater
+ return 1;
+ case 0x40: // 2 lttpr repeaters
+ return 2;
+ case 0x20: // 3 lttpr repeaters
+ return 3;
+ case 0x10: // 4 lttpr repeaters
+ return 4;
+ case 0x08: // 5 lttpr repeaters
+ return 5;
+ case 0x04: // 6 lttpr repeaters
+ return 6;
+ case 0x02: // 7 lttpr repeaters
+ return 7;
+ case 0x01: // 8 lttpr repeaters
+ return 8;
+ default:
+ break;
+ }
+ return 0; // invalid value
+}
+
+static inline bool is_immediate_downstream(struct dc_link *link, uint32_t offset)
+{
+ return (convert_to_count(link->dpcd_caps.lttpr_caps.phy_repeater_cnt) == offset);
+}
+
enum dc_status core_link_read_dpcd(
struct dc_link *link,
uint32_t address,
@@ -212,7 +242,8 @@ void dp_disable_link_phy_mst(struct dc_link *link, enum signal_type signal)
bool dp_set_hw_training_pattern(
struct dc_link *link,
- enum dc_dp_training_pattern pattern)
+ enum dc_dp_training_pattern pattern,
+ uint32_t offset)
{
enum dp_test_pattern test_pattern = DP_TEST_PATTERN_UNSUPPORTED;
@@ -240,10 +271,14 @@ bool dp_set_hw_training_pattern(
void dp_set_hw_lane_settings(
struct dc_link *link,
- const struct link_training_settings *link_settings)
+ const struct link_training_settings *link_settings,
+ uint32_t offset)
{
struct link_encoder *encoder = link->link_enc;
+ if (!link->is_lttpr_mode_transparent && !is_immediate_downstream(link, offset))
+ return;
+
/* call Encoder to set lane settings */
encoder->funcs->dp_set_lane_settings(encoder, link_settings);
}
diff --git a/drivers/gpu/drm/amd/display/dc/inc/link_hwss.h b/drivers/gpu/drm/amd/display/dc/inc/link_hwss.h
index 4eff5d38a2f9..9af7ee5bc8ee 100644
--- a/drivers/gpu/drm/amd/display/dc/inc/link_hwss.h
+++ b/drivers/gpu/drm/amd/display/dc/inc/link_hwss.h
@@ -60,11 +60,13 @@ void dp_disable_link_phy_mst(struct dc_link *link, enum signal_type signal);
bool dp_set_hw_training_pattern(
struct dc_link *link,
- enum dc_dp_training_pattern pattern);
+ enum dc_dp_training_pattern pattern,
+ uint32_t offset);
void dp_set_hw_lane_settings(
struct dc_link *link,
- const struct link_training_settings *link_settings);
+ const struct link_training_settings *link_settings,
+ uint32_t offset);
void dp_set_hw_test_pattern(
struct dc_link *link,
--
2.17.1
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