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drm/amd/display: Read eDP link settings on detection

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[Why]
Unlike external DP panels, internal eDP does not perform
verify link caps because the panel connection is fixed.

So if GOP enabled the eDP at boot, we can retain its
trained link settings to optimize.

[How]
Read the lane count and link rate by reading this
information from DPCD 100h, 101h, 115h

Signed-off-by: Anthony Koo <Anthony.Koo@amd.com>
Reviewed-by: Aric Cyr <Aric.Cyr@amd.com>
Acked-by: Bhawanpreet Lakha <Bhawanpreet Lakha@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Anthony Koo 2019-03-25 20:33:35 -04:00 committed by Alex Deucher
parent e54ae52429
commit 32a5b542a6
1 changed files with 30 additions and 0 deletions
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30
drivers/gpu/drm/amd/display/dc/core/dc_link_dp.c
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@ -2587,6 +2587,9 @@ void detect_edp_sink_caps(struct dc_link *link)
uint32_t entry;
uint32_t link_rate_in_khz;
enum dc_link_rate link_rate = LINK_RATE_UNKNOWN;
union lane_count_set lane_count_set = { {0} };
uint8_t link_bw_set;
uint8_t link_rate_set;
retrieve_link_cap(link);
link->dpcd_caps.edp_supported_link_rates_count = 0;
@ -2612,6 +2615,33 @@ void detect_edp_sink_caps(struct dc_link *link)
}
}
link->verified_link_cap = link->reported_link_cap;
// Read DPCD 00101h to find out the number of lanes currently set
core_link_read_dpcd(link, DP_LANE_COUNT_SET,
&lane_count_set.raw, sizeof(lane_count_set));
link->cur_link_settings.lane_count = lane_count_set.bits.LANE_COUNT_SET;
// Read DPCD 00100h to find if standard link rates are set
core_link_read_dpcd(link, DP_LINK_BW_SET,
&link_bw_set, sizeof(link_bw_set));
if (link_bw_set == 0) {
/* If standard link rates are not being used,
* Read DPCD 00115h to find the link rate set used
*/
core_link_read_dpcd(link, DP_LINK_RATE_SET,
&link_rate_set, sizeof(link_rate_set));
if (link_rate_set < link->dpcd_caps.edp_supported_link_rates_count) {
link->cur_link_settings.link_rate =
link->dpcd_caps.edp_supported_link_rates[link_rate_set];
link->cur_link_settings.link_rate_set = link_rate_set;
link->cur_link_settings.use_link_rate_set = true;
}
} else {
link->cur_link_settings.link_rate = link_bw_set;
link->cur_link_settings.use_link_rate_set = false;
}
}
void dc_link_dp_enable_hpd(const struct dc_link *link)