linux/drivers/gpu/drm/amd/display/dc/link/protocols/link_dp_phy.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:
 * This file implements basic dp phy functionality such as enable/disable phy
 * output and set lane/drive settings. This file is responsible for maintaining
 * and update software state representing current phy status such as current
 * link settings.
 */

#include "link_dp_phy.h"
#include "link_dpcd.h"
#include "link_dp_training.h"
#include "link_dp_capability.h"
#include "clk_mgr.h"
#include "resource.h"
#include "link_enc_cfg.h"
#include "atomfirmware.h"
#define DC_LOGGER …

void dpcd_write_rx_power_ctrl(struct dc_link *link, bool on)
{ … }

void dp_enable_link_phy(
	struct dc_link *link,
	const struct link_resource *link_res,
	enum signal_type signal,
	enum clock_source_id clock_source,
	const struct dc_link_settings *link_settings)
{ … }

void dp_disable_link_phy(struct dc_link *link,
		const struct link_resource *link_res,
		enum signal_type signal)
{ … }

static inline bool is_immediate_downstream(struct dc_link *link, uint32_t offset)
{ … }

void dp_set_hw_lane_settings(
	struct dc_link *link,
	const struct link_resource *link_res,
	const struct link_training_settings *link_settings,
	uint32_t offset)
{ … }

void dp_set_drive_settings(
	struct dc_link *link,
	const struct link_resource *link_res,
	struct link_training_settings *lt_settings)
{ … }

enum dc_status dp_set_fec_ready(struct dc_link *link, const struct link_resource *link_res, bool ready)
{ … }

void dp_set_fec_enable(struct dc_link *link, bool enable)
{ … }