Commit bad7ab0b authored by abdoulaye berthe's avatar abdoulaye berthe Committed by Alex Deucher
Browse files

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: default avatarabdoulaye berthe <abdoulaye.berthe@amd.com>
Reviewed-by: default avatarAric Cyr <Aric.Cyr@amd.com>
Signed-off-by: default avatarAlex Deucher <alexander.deucher@amd.com>
parent 903e859b

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

+42 −0
Original line number Diff line number Diff line
@@ -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) {