linux/drivers/gpu/drm/amd/display/dc/link/protocols/link_dp_training_auxless.c

/*
 * Copyright 2022 Advanced Micro Devices, Inc.
 *
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated documentation files (the "Software"),
 * to deal in the Software without restriction, including without limitation
 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
 * and/or sell copies of the Software, and to permit persons to whom the
 * Software is furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
 * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
 * OTHER DEALINGS IN THE SOFTWARE.
 *
 * Authors: AMD
 *
 */

/* FILE POLICY AND INTENDED USAGE:
 *
 */
#include "link_dp_training_auxless.h"
#include "link_dp_phy.h"
#define DC_LOGGER \
	link->ctx->logger
bool dp_perform_link_training_skip_aux(
	struct dc_link *link,
	const struct link_resource *link_res,
	const struct dc_link_settings *link_setting)
{
	struct link_training_settings lt_settings = {0};

	dp_decide_training_settings(
			link,
			link_setting,
			&lt_settings);
	override_training_settings(
			link,
			&link->preferred_training_settings,
			&lt_settings);

	/* 1. Perform_clock_recovery_sequence. */

	/* transmit training pattern for clock recovery */
	dp_set_hw_training_pattern(link, link_res, lt_settings.pattern_for_cr, DPRX);

	/* call HWSS to set lane settings*/
	dp_set_hw_lane_settings(link, link_res, &lt_settings, DPRX);

	/* wait receiver to lock-on*/
	dp_wait_for_training_aux_rd_interval(link, lt_settings.cr_pattern_time);

	/* 2. Perform_channel_equalization_sequence. */

	/* transmit training pattern for channel equalization. */
	dp_set_hw_training_pattern(link, link_res, lt_settings.pattern_for_eq, DPRX);

	/* call HWSS to set lane settings*/
	dp_set_hw_lane_settings(link, link_res, &lt_settings, DPRX);

	/* wait receiver to lock-on. */
	dp_wait_for_training_aux_rd_interval(link, lt_settings.eq_pattern_time);

	/* 3. Perform_link_training_int. */

	/* Mainlink output idle pattern. */
	dp_set_hw_test_pattern(link, link_res, DP_TEST_PATTERN_VIDEO_MODE, NULL, 0);

	dp_log_training_result(link, &lt_settings, LINK_TRAINING_SUCCESS);

	return true;
}