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drm/amd/display: Extend AUX timeout for DP initial reads

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[WHY]
DP LL Compliance tests require that the first DPCD transactions after a
hotplug have a timeout interval of 3.2 ms.  In cases where LTTPR is
disabled, this means that the first reads from DP_SET_POWER and DP_DPCD_REV must have an extended
timeout.

Signed-off-by: Wesley Chalmers <Wesley.Chalmers@amd.com>
Reviewed-by: Jun Lei <Jun.Lei@amd.com>
Acked-by: Anson Jacob <Anson.Jacob@amd.com>
Tested-by: Daniel Wheeler <daniel.wheeler@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Wesley Chalmers 2021-06-08 14:11:10 -04:00 committed by Alex Deucher
parent 78ebca3219
commit d0414a834c
1 changed files with 3 additions and 4 deletions
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7
drivers/gpu/drm/amd/display/dc/core/dc_link_dp.c
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@ -3750,9 +3750,6 @@ static bool retrieve_link_cap(struct dc_link *link)
LINK_AUX_DEFAULT_LTTPR_TIMEOUT_PERIOD);
is_lttpr_present = dp_retrieve_lttpr_cap(link);
if (!is_lttpr_present)
dc_link_aux_try_to_configure_timeout(link->ddc, LINK_AUX_DEFAULT_TIMEOUT_PERIOD);
status = core_link_read_dpcd(link, DP_SET_POWER,
&dpcd_power_state, sizeof(dpcd_power_state));
@ -3781,12 +3778,14 @@ static bool retrieve_link_cap(struct dc_link *link)
break;
}
if (status != DC_OK) {
dm_error("%s: Read receiver caps dpcd data failed.\n", __func__);
return false;
}
if (!is_lttpr_present)
dc_link_aux_try_to_configure_timeout(link->ddc, LINK_AUX_DEFAULT_TIMEOUT_PERIOD);
{
union training_aux_rd_interval aux_rd_interval;