[PATCH 01/21] drm/amd/display: Remove Legacy FIXED_VS Transparent LT Sequence
Hamza Mahfooz
hamza.mahfooz at amd.com
Wed Jan 31 20:11:07 UTC 2024
From: Michael Strauss <michael.strauss at amd.com>
The New sequence has been in use in DCN314 with no regressions
introduced. Therefore, it is safe to enable this sequence for all
devices using FIXED_VS retimers. So, remove the legacy codepath and its
associated config flag.
Reviewed-by: Ovidiu Bunea <ovidiu.bunea at amd.com>
Acked-by: Hamza Mahfooz <hamza.mahfooz at amd.com>
Signed-off-by: Michael Strauss <michael.strauss at amd.com>
---
drivers/gpu/drm/amd/display/dc/dc.h | 1 -
.../dc/link/protocols/link_dp_training.c | 5 +-
.../link_dp_training_fixed_vs_pe_retimer.c | 350 ------------------
.../link_dp_training_fixed_vs_pe_retimer.h | 5 -
.../dc/resource/dcn31/dcn31_resource.c | 2 -
5 files changed, 1 insertion(+), 362 deletions(-)
diff --git a/drivers/gpu/drm/amd/display/dc/dc.h b/drivers/gpu/drm/amd/display/dc/dc.h
index 5d95b1e9dafb..74c871917eaf 100644
--- a/drivers/gpu/drm/amd/display/dc/dc.h
+++ b/drivers/gpu/drm/amd/display/dc/dc.h
@@ -429,7 +429,6 @@ struct dc_config {
bool force_bios_enable_lttpr;
uint8_t force_bios_fixed_vs;
int sdpif_request_limit_words_per_umc;
- bool use_old_fixed_vs_sequence;
bool dc_mode_clk_limit_support;
bool EnableMinDispClkODM;
bool enable_auto_dpm_test_logs;
diff --git a/drivers/gpu/drm/amd/display/dc/link/protocols/link_dp_training.c b/drivers/gpu/drm/amd/display/dc/link/protocols/link_dp_training.c
index 5a0b04518956..e06d3c2d8910 100644
--- a/drivers/gpu/drm/amd/display/dc/link/protocols/link_dp_training.c
+++ b/drivers/gpu/drm/amd/display/dc/link/protocols/link_dp_training.c
@@ -1505,10 +1505,7 @@ enum link_training_result dp_perform_link_training(
* Non-LT AUX transactions inside training mode.
*/
if ((link->chip_caps & EXT_DISPLAY_PATH_CAPS__DP_FIXED_VS_EN) && encoding == DP_8b_10b_ENCODING)
- if (link->dc->config.use_old_fixed_vs_sequence)
- status = dp_perform_fixed_vs_pe_training_sequence_legacy(link, link_res, <_settings);
- else
- status = dp_perform_fixed_vs_pe_training_sequence(link, link_res, <_settings);
+ status = dp_perform_fixed_vs_pe_training_sequence(link, link_res, <_settings);
else if (encoding == DP_8b_10b_ENCODING)
status = dp_perform_8b_10b_link_training(link, link_res, <_settings);
else if (encoding == DP_128b_132b_ENCODING)
diff --git a/drivers/gpu/drm/amd/display/dc/link/protocols/link_dp_training_fixed_vs_pe_retimer.c b/drivers/gpu/drm/amd/display/dc/link/protocols/link_dp_training_fixed_vs_pe_retimer.c
index 7087cdc9e977..c36e0e5df447 100644
--- a/drivers/gpu/drm/amd/display/dc/link/protocols/link_dp_training_fixed_vs_pe_retimer.c
+++ b/drivers/gpu/drm/amd/display/dc/link/protocols/link_dp_training_fixed_vs_pe_retimer.c
@@ -186,356 +186,6 @@ static enum link_training_result perform_fixed_vs_pe_nontransparent_training_seq
return status;
}
-
-enum link_training_result dp_perform_fixed_vs_pe_training_sequence_legacy(
- 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_parse_lttpr_repeater_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 = 0;
- uint8_t vendor_lttpr_write_data_vs[4] = {0x1, 0x51, 0x63, 0x0};
- uint8_t vendor_lttpr_write_data_pe[4] = {0x1, 0x52, 0x63, 0x0};
- const uint8_t vendor_lttpr_write_data_4lane_1[4] = {0x1, 0x6E, 0xF2, 0x19};
- const uint8_t vendor_lttpr_write_data_4lane_2[4] = {0x1, 0x6B, 0xF2, 0x01};
- const uint8_t vendor_lttpr_write_data_4lane_3[4] = {0x1, 0x6D, 0xF2, 0x18};
- const uint8_t vendor_lttpr_write_data_4lane_4[4] = {0x1, 0x6C, 0xF2, 0x03};
- const uint8_t vendor_lttpr_write_data_4lane_5[4] = {0x1, 0x03, 0xF3, 0x06};
- const uint8_t vendor_lttpr_write_data_dpmf[4] = {0x1, 0x6, 0x70, 0x87};
- 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(link_dp_get_encoding_format(<_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) {
- if (offset == 2) {
- pre_disable_intercept_delay_ms = link->dc->debug.fixed_vs_aux_delay_config_wa;
-
- /* Certain display and cable configuration require extra delay */
- } else if (offset > 2) {
- pre_disable_intercept_delay_ms = link->dc->debug.fixed_vs_aux_delay_config_wa * 2;
- }
- }
-
- /* Vendor specific: Reset lane settings */
- link_configure_fixed_vs_pe_retimer(link->ddc,
- &vendor_lttpr_write_data_reset[0], sizeof(vendor_lttpr_write_data_reset));
- link_configure_fixed_vs_pe_retimer(link->ddc,
- &vendor_lttpr_write_data_vs[0], sizeof(vendor_lttpr_write_data_vs));
- link_configure_fixed_vs_pe_retimer(link->ddc,
- &vendor_lttpr_write_data_pe[0], sizeof(vendor_lttpr_write_data_pe));
-
- /* Vendor specific: Enable intercept */
- link_configure_fixed_vs_pe_retimer(link->ddc,
- &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(<_settings->link_settings);
-
- /* Vendor specific: Toggle link rate */
- toggle_rate = (rate == 0x6) ? 0xA : 0x6;
-
- if (link->vendor_specific_lttpr_link_rate_wa == rate || link->vendor_specific_lttpr_link_rate_wa == 0) {
- 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);
-
- link_configure_fixed_vs_pe_retimer(link->ddc,
- &vendor_lttpr_write_data_dpmf[0],
- sizeof(vendor_lttpr_write_data_dpmf));
-
- if (lt_settings->link_settings.lane_count == LANE_COUNT_FOUR) {
- link_configure_fixed_vs_pe_retimer(link->ddc,
- &vendor_lttpr_write_data_4lane_1[0], sizeof(vendor_lttpr_write_data_4lane_1));
- link_configure_fixed_vs_pe_retimer(link->ddc,
- &vendor_lttpr_write_data_4lane_2[0], sizeof(vendor_lttpr_write_data_4lane_2));
- link_configure_fixed_vs_pe_retimer(link->ddc,
- &vendor_lttpr_write_data_4lane_3[0], sizeof(vendor_lttpr_write_data_4lane_3));
- link_configure_fixed_vs_pe_retimer(link->ddc,
- &vendor_lttpr_write_data_4lane_4[0], sizeof(vendor_lttpr_write_data_4lane_4));
- link_configure_fixed_vs_pe_retimer(link->ddc,
- &vendor_lttpr_write_data_4lane_5[0], sizeof(vendor_lttpr_write_data_4lane_5));
- }
-
- /* 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};
- 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++) {
- if (pre_disable_intercept_delay_ms != 0)
- msleep(pre_disable_intercept_delay_ms);
- if (link_configure_fixed_vs_pe_retimer(link->ddc,
- &vendor_lttpr_write_data_intercept_dis[0],
- sizeof(vendor_lttpr_write_data_intercept_dis)))
- break;
-
- link_configure_fixed_vs_pe_retimer(link->ddc,
- &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 */
- link_configure_fixed_vs_pe_retimer(link->ddc,
- &vendor_lttpr_write_data_vs[0], sizeof(vendor_lttpr_write_data_vs));
- link_configure_fixed_vs_pe_retimer(link->ddc,
- &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 */
- link_configure_fixed_vs_pe_retimer(link->ddc,
- &vendor_lttpr_write_data_vs[0], sizeof(vendor_lttpr_write_data_vs));
- link_configure_fixed_vs_pe_retimer(link->ddc,
- &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;
-}
-
enum link_training_result dp_perform_fixed_vs_pe_training_sequence(
struct dc_link *link,
const struct link_resource *link_res,
diff --git a/drivers/gpu/drm/amd/display/dc/link/protocols/link_dp_training_fixed_vs_pe_retimer.h b/drivers/gpu/drm/amd/display/dc/link/protocols/link_dp_training_fixed_vs_pe_retimer.h
index c0d6ea329504..e61970e27661 100644
--- a/drivers/gpu/drm/amd/display/dc/link/protocols/link_dp_training_fixed_vs_pe_retimer.h
+++ b/drivers/gpu/drm/amd/display/dc/link/protocols/link_dp_training_fixed_vs_pe_retimer.h
@@ -28,11 +28,6 @@
#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_legacy(
- struct dc_link *link,
- const struct link_resource *link_res,
- struct link_training_settings *lt_settings);
-
enum link_training_result dp_perform_fixed_vs_pe_training_sequence(
struct dc_link *link,
const struct link_resource *link_res,
diff --git a/drivers/gpu/drm/amd/display/dc/resource/dcn31/dcn31_resource.c b/drivers/gpu/drm/amd/display/dc/resource/dcn31/dcn31_resource.c
index 31035fc3d868..04d142f97474 100644
--- a/drivers/gpu/drm/amd/display/dc/resource/dcn31/dcn31_resource.c
+++ b/drivers/gpu/drm/amd/display/dc/resource/dcn31/dcn31_resource.c
@@ -1941,8 +1941,6 @@ static bool dcn31_resource_construct(
dc->caps.color.mpc.ogam_rom_caps.hlg = 0;
dc->caps.color.mpc.ocsc = 1;
- dc->config.use_old_fixed_vs_sequence = true;
-
/* Use pipe context based otg sync logic */
dc->config.use_pipe_ctx_sync_logic = true;
--
2.43.0
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