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drm/amd/display: Add ability to set preferred link training parameters.

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[WHY]
To add support for OS requirement to set preferred link training
parameters.

[HOW]
Create new structure of dp link training overrides. During link training
processes, these values should be used instead of the default training
parameters.

Signed-off-by: David Galiffi <David.Galiffi@amd.com>
Reviewed-by: Tony Cheng <Tony.Cheng@amd.com>
Acked-by: Anthony Koo <Anthony.Koo@amd.com>
Acked-by: Leo Li <sunpeng.li@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
David Galiffi 2019-05-30 11:56:39 -04:00 committed by Alex Deucher
parent 93c25fbdc3
commit e0a6440a29
7 changed files with 338 additions and 124 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

46
drivers/gpu/drm/amd/display/dc/core/dc_link.c
View File

@ -1189,6 +1189,9 @@ static bool construct(
link->ctx = dc_ctx;
link->link_index = init_params->link_index;
memset(&link->preferred_training_settings, 0, sizeof(struct dc_link_training_overrides));
memset(&link->preferred_link_setting, 0, sizeof(struct dc_link_settings));
link->link_id = bios->funcs->get_connector_id(bios, init_params->connector_index);
if (link->link_id.type != OBJECT_TYPE_CONNECTOR) {
@ -1467,6 +1470,9 @@ static enum dc_status enable_link_dp(
struct dc_link *link = stream->link;
struct dc_link_settings link_settings = {0};
enum dp_panel_mode panel_mode;
#ifdef CONFIG_DRM_AMD_DC_DSC_SUPPORT
bool fec_enable;
#endif
/* get link settings for video mode timing */
decide_link_settings(stream, &link_settings);
@ -1511,10 +1517,20 @@ static enum dc_status enable_link_dp(
skip_video_pattern = false;
#ifdef CONFIG_DRM_AMD_DC_DSC_SUPPORT
dp_set_fec_ready(link, true);
if (link->preferred_training_settings.fec_enable != NULL)
fec_enable = *link->preferred_training_settings.fec_enable;
else
fec_enable = true;
dp_set_fec_ready(link, fec_enable);
#endif
if (perform_link_training_with_retries(
if (link->aux_access_disabled) {
dc_link_dp_perform_link_training_skip_aux(link, &link_settings);
link->cur_link_settings = link_settings;
status = DC_OK;
} else if (perform_link_training_with_retries(
link,
&link_settings,
skip_video_pattern,
@ -1526,7 +1542,7 @@ static enum dc_status enable_link_dp(
status = DC_FAIL_DP_LINK_TRAINING;
#ifdef CONFIG_DRM_AMD_DC_DSC_SUPPORT
dp_set_fec_enable(link, true);
dp_set_fec_enable(link, fec_enable);
#endif
return status;
}
@ -3014,6 +3030,29 @@ void dc_link_set_preferred_link_settings(struct dc *dc,
dp_retrain_link_dp_test(link, &store_settings, false);
}
void dc_link_set_preferred_training_settings(struct dc *dc,
struct dc_link_settings *link_setting,
struct dc_link_training_overrides *lt_overrides,
struct dc_link *link,
bool skip_immediate_retrain)
{
if (lt_overrides != NULL)
link->preferred_training_settings = *lt_overrides;
else
memset(&link->preferred_training_settings, 0, sizeof(link->preferred_training_settings));
if (link_setting != NULL) {
link->preferred_link_setting = *link_setting;
} else {
link->preferred_link_setting.lane_count = LANE_COUNT_UNKNOWN;
link->preferred_link_setting.link_rate = LINK_RATE_UNKNOWN;
}
/* Retrain now, or wait until next stream update to apply */
if (skip_immediate_retrain == false)
dc_link_set_preferred_link_settings(dc, &link->preferred_link_setting, link);
}
void dc_link_enable_hpd(const struct dc_link *link)
{
dc_link_dp_enable_hpd(link);
@ -3024,7 +3063,6 @@ void dc_link_disable_hpd(const struct dc_link *link)
dc_link_dp_disable_hpd(link);
}
void dc_link_set_test_pattern(struct dc_link *link,
enum dp_test_pattern test_pattern,
const struct link_training_settings *p_link_settings,

337
drivers/gpu/drm/amd/display/dc/core/dc_link_dp.c
View File

@ -49,7 +49,7 @@ static struct dc_link_settings get_common_supported_link_settings(
struct dc_link_settings link_setting_a,
struct dc_link_settings link_setting_b);
static void wait_for_training_aux_rd_interval(
static uint32_t get_training_aux_rd_interval(
struct dc_link *link,
uint32_t default_wait_in_micro_secs)
{
@ -68,15 +68,21 @@ static void wait_for_training_aux_rd_interval(
sizeof(training_rd_interval));
if (training_rd_interval.bits.TRAINIG_AUX_RD_INTERVAL)
default_wait_in_micro_secs =
training_rd_interval.bits.TRAINIG_AUX_RD_INTERVAL * 4000;
default_wait_in_micro_secs = training_rd_interval.bits.TRAINIG_AUX_RD_INTERVAL * 4000;
}
udelay(default_wait_in_micro_secs);
return default_wait_in_micro_secs;
}
static void wait_for_training_aux_rd_interval(
struct dc_link *link,
uint32_t wait_in_micro_secs)
{
udelay(wait_in_micro_secs);
DC_LOG_HW_LINK_TRAINING("%s:\n wait = %d\n",
__func__,
default_wait_in_micro_secs);
wait_in_micro_secs);
}
static void dpcd_set_training_pattern(
@ -95,27 +101,27 @@ static void dpcd_set_training_pattern(
dpcd_pattern.v1_4.TRAINING_PATTERN_SET);
}
static enum hw_dp_training_pattern get_supported_tp(struct dc_link *link)
static enum dc_dp_training_pattern get_supported_tp(struct dc_link *link)
{
enum hw_dp_training_pattern highest_tp = HW_DP_TRAINING_PATTERN_2;
enum dc_dp_training_pattern highest_tp = DP_TRAINING_PATTERN_SEQUENCE_2;
struct encoder_feature_support *features = &link->link_enc->features;
struct dpcd_caps *dpcd_caps = &link->dpcd_caps;
if (features->flags.bits.IS_TPS3_CAPABLE)
highest_tp = HW_DP_TRAINING_PATTERN_3;
highest_tp = DP_TRAINING_PATTERN_SEQUENCE_3;
if (features->flags.bits.IS_TPS4_CAPABLE)
highest_tp = HW_DP_TRAINING_PATTERN_4;
highest_tp = DP_TRAINING_PATTERN_SEQUENCE_4;
if (dpcd_caps->max_down_spread.bits.TPS4_SUPPORTED &&
highest_tp >= HW_DP_TRAINING_PATTERN_4)
return HW_DP_TRAINING_PATTERN_4;
highest_tp >= DP_TRAINING_PATTERN_SEQUENCE_4)
return DP_TRAINING_PATTERN_SEQUENCE_4;
if (dpcd_caps->max_ln_count.bits.TPS3_SUPPORTED &&
highest_tp >= HW_DP_TRAINING_PATTERN_3)
return HW_DP_TRAINING_PATTERN_3;
highest_tp >= DP_TRAINING_PATTERN_SEQUENCE_3)
return DP_TRAINING_PATTERN_SEQUENCE_3;
return HW_DP_TRAINING_PATTERN_2;
return DP_TRAINING_PATTERN_SEQUENCE_2;
}
static void dpcd_set_link_settings(
@ -126,7 +132,7 @@ static void dpcd_set_link_settings(
union down_spread_ctrl downspread = { {0} };
union lane_count_set lane_count_set = { {0} };
enum hw_dp_training_pattern hw_tr_pattern;
enum dc_dp_training_pattern dp_tr_pattern;
downspread.raw = (uint8_t)
(lt_settings->link_settings.link_spread);
@ -134,21 +140,21 @@ static void dpcd_set_link_settings(
lane_count_set.bits.LANE_COUNT_SET =
lt_settings->link_settings.lane_count;
lane_count_set.bits.ENHANCED_FRAMING = 1;
lane_count_set.bits.ENHANCED_FRAMING = lt_settings->enhanced_framing;
lane_count_set.bits.POST_LT_ADJ_REQ_GRANTED = 0;
hw_tr_pattern = get_supported_tp(link);
if (hw_tr_pattern != HW_DP_TRAINING_PATTERN_4) {
dp_tr_pattern = get_supported_tp(link);
if (dp_tr_pattern != 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));
&downspread.raw, sizeof(downspread));
core_link_write_dpcd(link, DP_LANE_COUNT_SET,
&lane_count_set.raw, 1);
&lane_count_set.raw, 1);
if (link->dpcd_caps.dpcd_rev.raw >= DPCD_REV_14 &&
lt_settings->link_settings.use_link_rate_set == true) {
@ -162,46 +168,47 @@ static void dpcd_set_link_settings(
}
if (rate) {
DC_LOG_HW_LINK_TRAINING("%s\n %x rate = %x\n %x lane = %x\n %x spread = %x\n",
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);
} else {
DC_LOG_HW_LINK_TRAINING("%s\n %x rate set = %x\n %x lane = %x\n %x spread = %x\n",
DC_LOG_HW_LINK_TRAINING("%s\n %x rate set = %x\n %x lane = %x framing = %x\n %x spread = %x\n",
__func__,
DP_LINK_RATE_SET,
lt_settings->link_settings.link_rate_set,
DP_LANE_COUNT_SET,
lt_settings->link_settings.lane_count,
lt_settings->enhanced_framing,
DP_DOWNSPREAD_CTRL,
lt_settings->link_settings.link_spread);
}
}
static enum dpcd_training_patterns
hw_training_pattern_to_dpcd_training_pattern(
dc_dp_training_pattern_to_dpcd_training_pattern(
struct dc_link *link,
enum hw_dp_training_pattern pattern)
enum dc_dp_training_pattern pattern)
{
enum dpcd_training_patterns dpcd_tr_pattern =
DPCD_TRAINING_PATTERN_VIDEOIDLE;
switch (pattern) {
case HW_DP_TRAINING_PATTERN_1:
case DP_TRAINING_PATTERN_SEQUENCE_1:
dpcd_tr_pattern = DPCD_TRAINING_PATTERN_1;
break;
case HW_DP_TRAINING_PATTERN_2:
case DP_TRAINING_PATTERN_SEQUENCE_2:
dpcd_tr_pattern = DPCD_TRAINING_PATTERN_2;
break;
case HW_DP_TRAINING_PATTERN_3:
case DP_TRAINING_PATTERN_SEQUENCE_3:
dpcd_tr_pattern = DPCD_TRAINING_PATTERN_3;
break;
case HW_DP_TRAINING_PATTERN_4:
case DP_TRAINING_PATTERN_SEQUENCE_4:
dpcd_tr_pattern = DPCD_TRAINING_PATTERN_4;
break;
default:
@ -212,13 +219,12 @@ static enum dpcd_training_patterns
}
return dpcd_tr_pattern;
}
static void dpcd_set_lt_pattern_and_lane_settings(
struct dc_link *link,
const struct link_training_settings *lt_settings,
enum hw_dp_training_pattern pattern)
enum dc_dp_training_pattern pattern)
{
union dpcd_training_lane dpcd_lane[LANE_COUNT_DP_MAX] = { { {0} } };
const uint32_t dpcd_base_lt_offset =
@ -233,7 +239,7 @@ static void dpcd_set_lt_pattern_and_lane_settings(
* DpcdAddress_TrainingPatternSet
*****************************************************************/
dpcd_pattern.v1_4.TRAINING_PATTERN_SET =
hw_training_pattern_to_dpcd_training_pattern(link, pattern);
dc_dp_training_pattern_to_dpcd_training_pattern(link, pattern);
dpcd_lt_buffer[DP_TRAINING_PATTERN_SET - dpcd_base_lt_offset]
= dpcd_pattern.raw;
@ -346,12 +352,20 @@ static void update_drive_settings(
{
uint32_t lane;
for (lane = 0; lane < src.link_settings.lane_count; lane++) {
dest->lane_settings[lane].VOLTAGE_SWING =
src.lane_settings[lane].VOLTAGE_SWING;
dest->lane_settings[lane].PRE_EMPHASIS =
src.lane_settings[lane].PRE_EMPHASIS;
dest->lane_settings[lane].POST_CURSOR2 =
src.lane_settings[lane].POST_CURSOR2;
if (dest->voltage_swing == NULL)
dest->lane_settings[lane].VOLTAGE_SWING = src.lane_settings[lane].VOLTAGE_SWING;
else
dest->lane_settings[lane].VOLTAGE_SWING = *dest->voltage_swing;
if (dest->pre_emphasis == NULL)
dest->lane_settings[lane].PRE_EMPHASIS = src.lane_settings[lane].PRE_EMPHASIS;
else
dest->lane_settings[lane].PRE_EMPHASIS = *dest->pre_emphasis;
if (dest->post_cursor2 == NULL)
dest->lane_settings[lane].POST_CURSOR2 = src.lane_settings[lane].POST_CURSOR2;
else
dest->lane_settings[lane].POST_CURSOR2 = *dest->post_cursor2;
}
}
@ -754,15 +768,15 @@ static enum link_training_result perform_channel_equalization_sequence(
struct link_training_settings *lt_settings)
{
struct link_training_settings req_settings;
enum hw_dp_training_pattern hw_tr_pattern;
enum dc_dp_training_pattern tr_pattern;
uint32_t retries_ch_eq;
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} } };
hw_tr_pattern = get_supported_tp(link);
tr_pattern = lt_settings->pattern_for_eq;
dp_set_hw_training_pattern(link, hw_tr_pattern);
dp_set_hw_training_pattern(link, tr_pattern);
for (retries_ch_eq = 0; retries_ch_eq <= LINK_TRAINING_MAX_RETRY_COUNT;
retries_ch_eq++) {
@ -776,12 +790,12 @@ static enum link_training_result perform_channel_equalization_sequence(
dpcd_set_lt_pattern_and_lane_settings(
link,
lt_settings,
hw_tr_pattern);
tr_pattern);
else
dpcd_set_lane_settings(link, lt_settings);
/* 3. wait for receiver to lock-on*/
wait_for_training_aux_rd_interval(link, 400);
wait_for_training_aux_rd_interval(link, lt_settings->eq_pattern_time);
/* 4. Read lane status and requested
* drive settings as set by the sink*/
@ -817,27 +831,16 @@ static enum link_training_result perform_clock_recovery_sequence(
{
uint32_t retries_cr;
uint32_t retry_count;
uint32_t lane;
struct link_training_settings req_settings;
enum dc_lane_count lane_count =
lt_settings->link_settings.lane_count;
enum hw_dp_training_pattern hw_tr_pattern = HW_DP_TRAINING_PATTERN_1;
enum dc_lane_count lane_count = lt_settings->link_settings.lane_count;
enum dc_dp_training_pattern tr_pattern = DP_TRAINING_PATTERN_SEQUENCE_1;
union lane_status dpcd_lane_status[LANE_COUNT_DP_MAX];
union lane_align_status_updated dpcd_lane_status_updated;
retries_cr = 0;
retry_count = 0;
/* initial drive setting (VS/PE/PC2)*/
for (lane = 0; lane < LANE_COUNT_DP_MAX; lane++) {
lt_settings->lane_settings[lane].VOLTAGE_SWING =
VOLTAGE_SWING_LEVEL0;
lt_settings->lane_settings[lane].PRE_EMPHASIS =
PRE_EMPHASIS_DISABLED;
lt_settings->lane_settings[lane].POST_CURSOR2 =
POST_CURSOR2_DISABLED;
}
dp_set_hw_training_pattern(link, hw_tr_pattern);
dp_set_hw_training_pattern(link, tr_pattern);
/* najeeb - The synaptics MST hub can put the LT in
* infinite loop by switching the VS
@ -845,7 +848,7 @@ static enum link_training_result perform_clock_recovery_sequence(
/* 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)) {
(retry_count < LINK_TRAINING_MAX_CR_RETRY)) {
memset(&dpcd_lane_status, '\0', sizeof(dpcd_lane_status));
memset(&dpcd_lane_status_updated, '\0',
@ -863,7 +866,7 @@ static enum link_training_result perform_clock_recovery_sequence(
dpcd_set_lt_pattern_and_lane_settings(
link,
lt_settings,
hw_tr_pattern);
tr_pattern);
else
dpcd_set_lane_settings(
link,
@ -872,7 +875,7 @@ static enum link_training_result perform_clock_recovery_sequence(
/* 3. wait receiver to lock-on*/
wait_for_training_aux_rd_interval(
link,
100);
lt_settings->cr_pattern_time);
/* 4. Read lane status and requested drive
* settings as set by the sink
@ -939,7 +942,7 @@ static inline enum link_training_result perform_link_training_int(
* TPS4 must be used instead of POST_LT_ADJ_REQ.
*/
if (link->dpcd_caps.max_ln_count.bits.POST_LT_ADJ_REQ_SUPPORTED != 1 ||
get_supported_tp(link) == HW_DP_TRAINING_PATTERN_4)
get_supported_tp(link) == DP_TRAINING_PATTERN_SEQUENCE_4)
return status;
if (status == LINK_TRAINING_SUCCESS &&
@ -947,7 +950,7 @@ static inline enum link_training_result perform_link_training_int(
status = LINK_TRAINING_LQA_FAIL;
lane_count_set.bits.LANE_COUNT_SET = lt_settings->link_settings.lane_count;
lane_count_set.bits.ENHANCED_FRAMING = 1;
lane_count_set.bits.ENHANCED_FRAMING = lt_settings->enhanced_framing;
lane_count_set.bits.POST_LT_ADJ_REQ_GRANTED = 0;
core_link_write_dpcd(
@ -959,24 +962,28 @@ static inline enum link_training_result perform_link_training_int(
return status;
}
enum link_training_result dc_link_dp_perform_link_training(
struct dc_link *link,
static void initialize_training_settings(
struct dc_link *link,
const struct dc_link_settings *link_setting,
bool skip_video_pattern)
struct link_training_settings *lt_settings)
{
enum link_training_result status = LINK_TRAINING_SUCCESS;
uint32_t lane;
char *link_rate = "Unknown";
char *lt_result = "Unknown";
memset(lt_settings, '\0', sizeof(struct link_training_settings));
struct link_training_settings lt_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;
memset(&lt_settings, '\0', sizeof(lt_settings));
if (link->preferred_link_setting.link_rate != LINK_RATE_UNKNOWN)
lt_settings->link_settings.link_rate = link->preferred_link_setting.link_rate;
else
lt_settings->link_settings.link_rate = link_setting->link_rate;
lt_settings.link_settings.link_rate = link_setting->link_rate;
lt_settings.link_settings.lane_count = link_setting->lane_count;
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;
if (link->preferred_link_setting.lane_count != LANE_COUNT_UNKNOWN)
lt_settings->link_settings.lane_count = link->preferred_link_setting.lane_count;
else
lt_settings->link_settings.lane_count = link_setting->lane_count;
/*@todo[vdevulap] move SS to LS, should not be handled by displaypath*/
@ -987,31 +994,75 @@ enum link_training_result dc_link_dp_perform_link_training(
* LINK_SPREAD_05_DOWNSPREAD_30KHZ :
* LINK_SPREAD_DISABLED;
*/
/* Initialize link spread */
if (link->dp_ss_off)
lt_settings.link_settings.link_spread = LINK_SPREAD_DISABLED;
lt_settings->link_settings.link_spread = LINK_SPREAD_DISABLED;
else if (link->preferred_training_settings.downspread != NULL)
lt_settings->link_settings.link_spread
= *link->preferred_training_settings.downspread
? LINK_SPREAD_05_DOWNSPREAD_30KHZ
: LINK_SPREAD_DISABLED;
else
lt_settings.link_settings.link_spread = LINK_SPREAD_05_DOWNSPREAD_30KHZ;
lt_settings->link_settings.link_spread = LINK_SPREAD_05_DOWNSPREAD_30KHZ;
/* 1. set link rate, lane count and spread*/
dpcd_set_link_settings(link, &lt_settings);
/* Initialize lane settings overrides */
if (link->preferred_training_settings.voltage_swing != NULL)
lt_settings->voltage_swing = link->preferred_training_settings.voltage_swing;
/* 2. perform link training (set link training done
* to false is done as well)*/
status = perform_clock_recovery_sequence(link, &lt_settings);
if (status == LINK_TRAINING_SUCCESS) {
status = perform_channel_equalization_sequence(link,
&lt_settings);
if (link->preferred_training_settings.pre_emphasis != NULL)
lt_settings->pre_emphasis = link->preferred_training_settings.pre_emphasis;
if (link->preferred_training_settings.post_cursor2 != NULL)
lt_settings->post_cursor2 = link->preferred_training_settings.post_cursor2;
/* Initialize lane settings (VS/PE/PC2) */
for (lane = 0; lane < LANE_COUNT_DP_MAX; lane++) {
lt_settings->lane_settings[lane].VOLTAGE_SWING =
lt_settings->voltage_swing != NULL ?
*lt_settings->voltage_swing :
VOLTAGE_SWING_LEVEL0;
lt_settings->lane_settings[lane].PRE_EMPHASIS =
lt_settings->pre_emphasis != NULL ?
*lt_settings->pre_emphasis
: PRE_EMPHASIS_DISABLED;
lt_settings->lane_settings[lane].POST_CURSOR2 =
lt_settings->post_cursor2 != NULL ?
*lt_settings->post_cursor2
: POST_CURSOR2_DISABLED;
}
if ((status == LINK_TRAINING_SUCCESS) || !skip_video_pattern) {
status = perform_link_training_int(link,
&lt_settings,
status);
}
/* Initialize training timings */
if (link->preferred_training_settings.cr_pattern_time != NULL)
lt_settings->cr_pattern_time = *link->preferred_training_settings.cr_pattern_time;
else
lt_settings->cr_pattern_time = get_training_aux_rd_interval(link, 100);
/* 6. print status message*/
switch (lt_settings.link_settings.link_rate) {
if (link->preferred_training_settings.eq_pattern_time != NULL)
lt_settings->eq_pattern_time = *link->preferred_training_settings.eq_pattern_time;
else
lt_settings->eq_pattern_time = get_training_aux_rd_interval(link, 400);
if (link->preferred_training_settings.pattern_for_eq != NULL)
lt_settings->pattern_for_eq = *link->preferred_training_settings.pattern_for_eq;
else
lt_settings->pattern_for_eq = get_supported_tp(link);
if (link->preferred_training_settings.enhanced_framing != NULL)
lt_settings->enhanced_framing = *link->preferred_training_settings.enhanced_framing;
else
lt_settings->enhanced_framing = 1;
}
static void print_status_message(
struct dc_link *link,
const struct link_training_settings *lt_settings,
enum link_training_result status)
{
char *link_rate = "Unknown";
char *lt_result = "Unknown";
char *lt_spread = "Disabled";
switch (lt_settings->link_settings.link_rate) {
case LINK_RATE_LOW:
link_rate = "RBR";
break;
@ -1057,13 +1108,102 @@ enum link_training_result dc_link_dp_perform_link_training(
break;
}
switch (lt_settings->link_settings.link_spread) {
case LINK_SPREAD_DISABLED:
lt_spread = "Disabled";
break;
case LINK_SPREAD_05_DOWNSPREAD_30KHZ:
lt_spread = "0.5% 30KHz";
break;
case LINK_SPREAD_05_DOWNSPREAD_33KHZ:
lt_spread = "0.5% 33KHz";
break;
default:
break;
}
/* Connectivity log: link training */
CONN_MSG_LT(link, "%sx%d %s VS=%d, PE=%d",
link_rate,
lt_settings.link_settings.lane_count,
lt_result,
lt_settings.lane_settings[0].VOLTAGE_SWING,
lt_settings.lane_settings[0].PRE_EMPHASIS);
CONN_MSG_LT(link, "%sx%d %s VS=%d, PE=%d, DS=%s",
link_rate,
lt_settings->link_settings.lane_count,
lt_result,
lt_settings->lane_settings[0].VOLTAGE_SWING,
lt_settings->lane_settings[0].PRE_EMPHASIS,
lt_spread);
}
bool dc_link_dp_perform_link_training_skip_aux(
struct dc_link *link,
const struct dc_link_settings *link_setting)
{
struct link_training_settings lt_settings;
enum dc_dp_training_pattern pattern_for_cr = DP_TRAINING_PATTERN_SEQUENCE_1;
initialize_training_settings(link, link_setting, &lt_settings);
/* 1. Perform_clock_recovery_sequence. */
/* transmit training pattern for clock recovery */
dp_set_hw_training_pattern(link, pattern_for_cr);
/* call HWSS to set lane settings*/
dp_set_hw_lane_settings(link, &lt_settings);
/* wait receiver to lock-on*/
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, lt_settings.pattern_for_eq);
/* call HWSS to set lane settings*/
dp_set_hw_lane_settings(link, &lt_settings);
/* wait receiver to lock-on. */
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, DP_TEST_PATTERN_VIDEO_MODE, NULL, 0);
print_status_message(link, &lt_settings, LINK_TRAINING_SUCCESS);
return true;
}
enum link_training_result dc_link_dp_perform_link_training(
struct dc_link *link,
const struct dc_link_settings *link_setting,
bool skip_video_pattern)
{
enum link_training_result status = LINK_TRAINING_SUCCESS;
struct link_training_settings lt_settings;
initialize_training_settings(link, link_setting, &lt_settings);
/* 1. set link rate, lane count and spread. */
dpcd_set_link_settings(link, &lt_settings);
/* 2. perform link training (set link training done
* to false is done as well)
*/
status = perform_clock_recovery_sequence(link, &lt_settings);
if (status == LINK_TRAINING_SUCCESS) {
status = perform_channel_equalization_sequence(link,
&lt_settings);
}
if ((status == LINK_TRAINING_SUCCESS) || !skip_video_pattern) {
status = perform_link_training_int(link,
&lt_settings,
status);
}
/* 6. print status message*/
print_status_message(link, &lt_settings, status);
if (status != LINK_TRAINING_SUCCESS)
link->ctx->dc->debug_data.ltFailCount++;
@ -1071,7 +1211,6 @@ enum link_training_result dc_link_dp_perform_link_training(
return status;
}
bool perform_link_training_with_retries(
struct dc_link *link,
const struct dc_link_settings *link_setting,

28
drivers/gpu/drm/amd/display/dc/core/dc_link_hwss.c
View File

@ -25,10 +25,11 @@ enum dc_status core_link_read_dpcd(
uint8_t *data,
uint32_t size)
{
if (!dm_helpers_dp_read_dpcd(link->ctx,
link,
address, data, size))
return DC_ERROR_UNEXPECTED;
if (!link->aux_access_disabled &&
!dm_helpers_dp_read_dpcd(link->ctx,
link, address, data, size)) {
return DC_ERROR_UNEXPECTED;
}
return DC_OK;
}
@ -39,10 +40,11 @@ enum dc_status core_link_write_dpcd(
const uint8_t *data,
uint32_t size)
{
if (!dm_helpers_dp_write_dpcd(link->ctx,
link,
address, data, size))
return DC_ERROR_UNEXPECTED;
if (!link->aux_access_disabled &&
!dm_helpers_dp_write_dpcd(link->ctx,
link, address, data, size)) {
return DC_ERROR_UNEXPECTED;
}
return DC_OK;
}
@ -203,21 +205,21 @@ 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 hw_dp_training_pattern pattern)
enum dc_dp_training_pattern pattern)
{
enum dp_test_pattern test_pattern = DP_TEST_PATTERN_UNSUPPORTED;
switch (pattern) {
case HW_DP_TRAINING_PATTERN_1:
case DP_TRAINING_PATTERN_SEQUENCE_1:
test_pattern = DP_TEST_PATTERN_TRAINING_PATTERN1;
break;
case HW_DP_TRAINING_PATTERN_2:
case DP_TRAINING_PATTERN_SEQUENCE_2:
test_pattern = DP_TEST_PATTERN_TRAINING_PATTERN2;
break;
case HW_DP_TRAINING_PATTERN_3:
case DP_TRAINING_PATTERN_SEQUENCE_3:
test_pattern = DP_TEST_PATTERN_TRAINING_PATTERN3;
break;
case HW_DP_TRAINING_PATTERN_4:
case DP_TRAINING_PATTERN_SEQUENCE_4:
test_pattern = DP_TEST_PATTERN_TRAINING_PATTERN4;
break;
default:

21
drivers/gpu/drm/amd/display/dc/dc_dp_types.h
View File

@ -90,6 +90,13 @@ enum dc_post_cursor2 {
POST_CURSOR2_MAX_LEVEL = POST_CURSOR2_LEVEL3,
};
enum dc_dp_training_pattern {
DP_TRAINING_PATTERN_SEQUENCE_1 = 0,
DP_TRAINING_PATTERN_SEQUENCE_2,
DP_TRAINING_PATTERN_SEQUENCE_3,
DP_TRAINING_PATTERN_SEQUENCE_4,
};
struct dc_link_settings {
enum dc_lane_count lane_count;
enum dc_link_rate link_rate;
@ -109,6 +116,20 @@ struct dc_link_training_settings {
struct dc_lane_settings lane_settings[LANE_COUNT_DP_MAX];
};
struct dc_link_training_overrides {
enum dc_voltage_swing *voltage_swing;
enum dc_pre_emphasis *pre_emphasis;
enum dc_post_cursor2 *post_cursor2;
uint16_t *cr_pattern_time;
uint16_t *eq_pattern_time;
enum dc_dp_training_pattern *pattern_for_eq;
enum dc_link_spread *downspread;
bool *alternate_scrambler_reset;
bool *enhanced_framing;
bool *fec_enable;
};
union dpcd_rev {
struct {

11
drivers/gpu/drm/amd/display/dc/dc_link.h
View File

@ -83,6 +83,7 @@ struct dc_link {
bool is_hpd_filter_disabled;
bool dp_ss_off;
bool link_state_valid;
bool aux_access_disabled;
/* caps is the same as reported_link_cap. link_traing use
* reported_link_cap. Will clean up. TODO
@ -92,6 +93,7 @@ struct dc_link {
struct dc_link_settings cur_link_settings;
struct dc_lane_settings cur_lane_setting;
struct dc_link_settings preferred_link_setting;
struct dc_link_training_overrides preferred_training_settings;
uint8_t ddc_hw_inst;
@ -217,6 +219,10 @@ void dc_link_dp_set_drive_settings(
struct dc_link *link,
struct link_training_settings *lt_settings);
bool dc_link_dp_perform_link_training_skip_aux(
struct dc_link *link,
const struct dc_link_settings *link_setting);
enum link_training_result dc_link_dp_perform_link_training(
struct dc_link *link,
const struct dc_link_settings *link_setting,
@ -251,6 +257,11 @@ void dc_link_perform_link_training(struct dc *dc,
void dc_link_set_preferred_link_settings(struct dc *dc,
struct dc_link_settings *link_setting,
struct dc_link *link);
void dc_link_set_preferred_training_settings(struct dc *dc,
struct dc_link_settings *link_setting,
struct dc_link_training_overrides *lt_overrides,
struct dc_link *link,
bool skip_immediate_retrain);
void dc_link_enable_hpd(const struct dc_link *link);
void dc_link_disable_hpd(const struct dc_link *link);
void dc_link_set_test_pattern(struct dc_link *link,

2
drivers/gpu/drm/amd/display/dc/inc/link_hwss.h
View File

@ -60,7 +60,7 @@ 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 hw_dp_training_pattern pattern);
enum dc_dp_training_pattern pattern);
void dp_set_hw_lane_settings(
struct dc_link *link,

17
drivers/gpu/drm/amd/display/include/link_service_types.h
View File

@ -71,14 +71,17 @@ enum link_training_result {
struct link_training_settings {
struct dc_link_settings link_settings;
struct dc_lane_settings lane_settings[LANE_COUNT_DP_MAX];
bool allow_invalid_msa_timing_param;
};
enum hw_dp_training_pattern {
HW_DP_TRAINING_PATTERN_1 = 0,
HW_DP_TRAINING_PATTERN_2,
HW_DP_TRAINING_PATTERN_3,
HW_DP_TRAINING_PATTERN_4
enum dc_voltage_swing *voltage_swing;
enum dc_pre_emphasis *pre_emphasis;
enum dc_post_cursor2 *post_cursor2;
uint16_t cr_pattern_time;
uint16_t eq_pattern_time;
enum dc_dp_training_pattern pattern_for_eq;
bool enhanced_framing;
bool allow_invalid_msa_timing_param;
};
/*TODO: Move this enum test harness*/