linux/drivers/gpu/drm/tegra/dp.h

/* SPDX-License-Identifier: MIT */
/*
 * Copyright (C) 2013-2019 NVIDIA Corporation.
 * Copyright (C) 2015 Rob Clark
 */

#ifndef DRM_TEGRA_DP_H
#define DRM_TEGRA_DP_H …

#include <linux/types.h>

struct drm_display_info;
struct drm_display_mode;
struct drm_dp_aux;
struct drm_dp_link;

/**
 * struct drm_dp_link_caps - DP link capabilities
 */
struct drm_dp_link_caps { … };

void drm_dp_link_caps_copy(struct drm_dp_link_caps *dest,
			   const struct drm_dp_link_caps *src);

/**
 * struct drm_dp_link_ops - DP link operations
 */
struct drm_dp_link_ops { … };

#define DP_TRAIN_VOLTAGE_SWING_LEVEL(x) …
#define DP_TRAIN_PRE_EMPHASIS_LEVEL(x) …
#define DP_LANE_POST_CURSOR(i, x) …

/**
 * struct drm_dp_link_train_set - link training settings
 * @voltage_swing: per-lane voltage swing
 * @pre_emphasis: per-lane pre-emphasis
 * @post_cursor: per-lane post-cursor
 */
struct drm_dp_link_train_set { … };

/**
 * struct drm_dp_link_train - link training state information
 * @request: currently requested settings
 * @adjust: adjustments requested by sink
 * @pattern: currently requested training pattern
 * @clock_recovered: flag to track if clock recovery has completed
 * @channel_equalized: flag to track if channel equalization has completed
 */
struct drm_dp_link_train { … };

/**
 * struct drm_dp_link - DP link capabilities and configuration
 * @revision: DP specification revision supported on the link
 * @max_rate: maximum clock rate supported on the link
 * @max_lanes: maximum number of lanes supported on the link
 * @caps: capabilities supported on the link (see &drm_dp_link_caps)
 * @aux_rd_interval: AUX read interval to use for training (in microseconds)
 * @edp: eDP revision (0x11: eDP 1.1, 0x12: eDP 1.2, ...)
 * @rate: currently configured link rate
 * @lanes: currently configured number of lanes
 * @rates: additional supported link rates in kHz (eDP 1.4)
 * @num_rates: number of additional supported link rates (eDP 1.4)
 */
struct drm_dp_link { … };

int drm_dp_link_add_rate(struct drm_dp_link *link, unsigned long rate);
int drm_dp_link_remove_rate(struct drm_dp_link *link, unsigned long rate);
void drm_dp_link_update_rates(struct drm_dp_link *link);

int drm_dp_link_probe(struct drm_dp_aux *aux, struct drm_dp_link *link);
int drm_dp_link_power_up(struct drm_dp_aux *aux, struct drm_dp_link *link);
int drm_dp_link_power_down(struct drm_dp_aux *aux, struct drm_dp_link *link);
int drm_dp_link_configure(struct drm_dp_aux *aux, struct drm_dp_link *link);
int drm_dp_link_choose(struct drm_dp_link *link,
		       const struct drm_display_mode *mode,
		       const struct drm_display_info *info);

void drm_dp_link_train_init(struct drm_dp_link_train *train);
int drm_dp_link_train(struct drm_dp_link *link);

#endif