diff options
| author | abdoulaye berthe <abdoulaye.berthe@amd.com> | 2019-07-19 17:43:42 +0300 |
|---|---|---|
| committer | Alex Deucher <alexander.deucher@amd.com> | 2019-11-13 23:29:43 +0300 |
| commit | bad7ab0be9bea2a4128158751bc29ac4b1c3bce2 (patch) | |
| tree | efcc6f624869f994b127094629eb9583e4394af2 /drivers | |
| parent | 903e859b72957985c60de593f364e33639964829 (diff) | |
| download | linux-bad7ab0be9bea2a4128158751bc29ac4b1c3bce2.tar.xz | |
drm/amd/display: configure lttpr mode
[Description]
1-Grant extended timeout request. Done once after detection
2-Configure lttpr mode based on lttpr support before LT
3-Account for lttpr cap when determining max link settings
Signed-off-by: abdoulaye berthe <abdoulaye.berthe@amd.com>
Reviewed-by: Aric Cyr <Aric.Cyr@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/gpu/drm/amd/display/dc/core/dc_link_dp.c | 42 |
1 files changed, 42 insertions, 0 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 1e4480f3bd3c..94d5a0ac308f 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 @@ -1057,6 +1057,26 @@ static void initialize_training_settings( lt_settings->enhanced_framing = 1; } +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 */ + enum lttpr_mode repeater_mode = phy_repeater_mode_transparent; + + core_link_write_dpcd(link, + DP_PHY_REPEATER_MODE, + (uint8_t *)&repeater_mode, + sizeof(repeater_mode)); + + if (!link->is_lttpr_mode_transparent) { + repeater_mode = phy_repeater_mode_non_transparent; + core_link_write_dpcd(link, + DP_PHY_REPEATER_MODE, + (uint8_t *)&repeater_mode, + sizeof(repeater_mode)); + } +} + static void print_status_message( struct dc_link *link, const struct link_training_settings *lt_settings, @@ -1210,6 +1230,9 @@ 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) + configure_lttpr_mode(link); /* 2. perform link training (set link training done * to false is done as well) @@ -1426,6 +1449,17 @@ static struct dc_link_settings get_max_link_cap(struct dc_link *link) max_link_cap.link_spread) max_link_cap.link_spread = link->reported_link_cap.link_spread; + /* + * account for lttpr repeaters cap + * notes: repeaters do not snoop in the DPRX Capabilities addresses (3.6.3). + */ + if (!link->is_lttpr_mode_transparent) { + if (link->dpcd_caps.lttpr_caps.max_lane_count < max_link_cap.lane_count) + max_link_cap.lane_count = link->dpcd_caps.lttpr_caps.max_lane_count; + + if (link->dpcd_caps.lttpr_caps.max_link_rate < max_link_cap.link_rate) + max_link_cap.link_rate = link->dpcd_caps.lttpr_caps.max_link_rate; + } return max_link_cap; } @@ -1571,6 +1605,13 @@ bool dp_verify_link_cap( max_link_cap = get_max_link_cap(link); + /* Grant extended timeout request */ + if (!link->is_lttpr_mode_transparent && link->dpcd_caps.lttpr_caps.max_ext_timeout > 0) { + uint8_t grant = link->dpcd_caps.lttpr_caps.max_ext_timeout & 0x80; + + core_link_write_dpcd(link, DP_PHY_REPEATER_EXTENDED_WAIT_TIMEOUT, &grant, sizeof(grant)); + } + /* TODO implement override and monitor patch later */ /* try to train the link from high to low to @@ -2759,6 +2800,7 @@ static bool retrieve_link_cap(struct dc_link *link) /* Set default timeout to 3.2ms and read LTTPR capabilities */ bool ext_timeout_support = link->dc->caps.extended_aux_timeout_support && !link->dc->config.disable_extended_timeout_support; + link->is_lttpr_mode_transparent = true; if (ext_timeout_support) { |