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drm/amd/display: configure lttpr mode

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[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>
This commit is contained in:
abdoulaye berthe 2019-07-19 10:43:42 -04:00 committed by Alex Deucher
parent 903e859b72
commit bad7ab0be9
1 changed files with 42 additions and 0 deletions
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42
drivers/gpu/drm/amd/display/dc/core/dc_link_dp.c
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@ -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) {