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| author | Wenjing Liu <wenjing.liu@amd.com> | 2021-05-03 18:42:28 -0400 |
|---|---|---|
| committer | Alex Deucher <alexander.deucher@amd.com> | 2021-05-19 22:39:13 -0400 |
| commit | f1900a9b0f6436153e6b1be398d31f1ead6096f6 (patch) | |
| tree | 8b2b8457c27b70b7fa1ded90a544c49769a50155 /drivers/gpu/drm/amd/display | |
| parent | 37f270c6d80505258918ab859e0d3c78be0b3ca5 (diff) | |
| download | linux-stable-f1900a9b0f6436153e6b1be398d31f1ead6096f6.tar.gz linux-stable-f1900a9b0f6436153e6b1be398d31f1ead6096f6.tar.bz2 linux-stable-f1900a9b0f6436153e6b1be398d31f1ead6096f6.zip | |
drm/amd/display: consider channel coding in configure lttpr mode
[why]
Some lttpr configuration steps are exclusive to 8b/10b channel
coding mode. We need to take channel conding into account.
Signed-off-by: Wenjing Liu <wenjing.liu@amd.com>
Reviewed-by: George Shen <George.Shen@amd.com>
Acked-by: Stylon Wang <stylon.wang@amd.com>
Acked-by: Wesley Chalmers <Wesley.Chalmers@amd.com>
Tested-by: Daniel Wheeler <daniel.wheeler@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Diffstat (limited to 'drivers/gpu/drm/amd/display')
| -rw-r--r-- | drivers/gpu/drm/amd/display/dc/core/dc_link_dp.c | 47 | ||||
| -rw-r--r-- | drivers/gpu/drm/amd/display/include/link_service_types.h | 1 |
2 files changed, 30 insertions, 18 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 d461df1a5686..9071277a9acf 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 @@ -1275,6 +1275,8 @@ static inline void decide_8b_10b_training_settings( else lt_settings->link_settings.link_spread = LINK_SPREAD_05_DOWNSPREAD_30KHZ; + lt_settings->lttpr_mode = link->lttpr_mode; + /* Initialize lane settings overrides */ if (overrides->voltage_swing != NULL) lt_settings->voltage_swing = overrides->voltage_swing; @@ -1367,13 +1369,16 @@ static void configure_lttpr_mode_transparent(struct dc_link *link) { uint8_t repeater_mode = DP_PHY_REPEATER_MODE_TRANSPARENT; + DC_LOG_HW_LINK_TRAINING("%s\n Set LTTPR to Transparent Mode\n", __func__); core_link_write_dpcd(link, DP_PHY_REPEATER_MODE, (uint8_t *)&repeater_mode, sizeof(repeater_mode)); } -static void configure_lttpr_mode_non_transparent(struct dc_link *link) +static void configure_lttpr_mode_non_transparent( + struct dc_link *link, + const struct link_training_settings *lt_settings) { /* aux timeout is already set to extended */ /* RESET/SET lttpr mode to enable non transparent mode */ @@ -1383,11 +1388,16 @@ static void configure_lttpr_mode_non_transparent(struct dc_link *link) enum dc_status result = DC_ERROR_UNEXPECTED; uint8_t repeater_mode = DP_PHY_REPEATER_MODE_TRANSPARENT; - DC_LOG_HW_LINK_TRAINING("%s\n Set LTTPR to Transparent Mode\n", __func__); - result = core_link_write_dpcd(link, - DP_PHY_REPEATER_MODE, - (uint8_t *)&repeater_mode, - sizeof(repeater_mode)); + enum dp_link_encoding encoding = dp_get_link_encoding_format(<_settings->link_settings); + + if (encoding == DP_8b_10b_ENCODING) { + DC_LOG_HW_LINK_TRAINING("%s\n Set LTTPR to Transparent Mode\n", __func__); + result = core_link_write_dpcd(link, + DP_PHY_REPEATER_MODE, + (uint8_t *)&repeater_mode, + sizeof(repeater_mode)); + + } if (result == DC_OK) { link->dpcd_caps.lttpr_caps.mode = repeater_mode; @@ -1407,17 +1417,18 @@ static void configure_lttpr_mode_non_transparent(struct dc_link *link) link->dpcd_caps.lttpr_caps.mode = repeater_mode; } - repeater_cnt = dp_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; + if (encoding == DP_8b_10b_ENCODING) { + repeater_cnt = dp_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; + } } } } @@ -1611,7 +1622,7 @@ enum link_training_result dc_link_dp_perform_link_training( /* Configure lttpr mode */ if (link->lttpr_mode == LTTPR_MODE_NON_TRANSPARENT) - configure_lttpr_mode_non_transparent(link); + configure_lttpr_mode_non_transparent(link, <_settings); else if (link->lttpr_mode == LTTPR_MODE_TRANSPARENT) configure_lttpr_mode_transparent(link); diff --git a/drivers/gpu/drm/amd/display/include/link_service_types.h b/drivers/gpu/drm/amd/display/include/link_service_types.h index 73ada16658aa..7a30ca01e7d4 100644 --- a/drivers/gpu/drm/amd/display/include/link_service_types.h +++ b/drivers/gpu/drm/amd/display/include/link_service_types.h @@ -93,6 +93,7 @@ struct link_training_settings { bool enhanced_framing; bool allow_invalid_msa_timing_param; + enum lttpr_mode lttpr_mode; }; /*TODO: Move this enum test harness*/ |