Commit d0414a83 authored by Wesley Chalmers's avatar Wesley Chalmers Committed by Alex Deucher
Browse files

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



[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: default avatarWesley Chalmers <Wesley.Chalmers@amd.com>
Reviewed-by: default avatarJun Lei <Jun.Lei@amd.com>
Acked-by: default avatarAnson Jacob <Anson.Jacob@amd.com>
Tested-by: default avatarDaniel Wheeler <daniel.wheeler@amd.com>
Signed-off-by: default avatarAlex Deucher <alexander.deucher@amd.com>
parent 78ebca32

drivers/gpu/drm/amd/display/dc/core/dc_link_dp.c

+3 −4
Original line number Diff line number Diff line
@@ -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;