1/*
2 * Copyright 2022 Advanced Micro Devices, Inc.
3 *
4 * Permission is hereby granted, free of charge, to any person obtaining a
5 * copy of this software and associated documentation files (the "Software"),
6 * to deal in the Software without restriction, including without limitation
7 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
8 * and/or sell copies of the Software, and to permit persons to whom the
9 * Software is furnished to do so, subject to the following conditions:
10 *
11 * The above copyright notice and this permission notice shall be included in
12 * all copies or substantial portions of the Software.
13 *
14 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
15 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
16 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
17 * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
18 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
19 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
20 * OTHER DEALINGS IN THE SOFTWARE.
21 *
22 * Authors: AMD
23 *
24 */
25
26
27#ifndef __DC_LINK_HPD_H__
28#define __DC_LINK_HPD_H__
29#include "link.h"
30
31enum hpd_source_id get_hpd_line(struct dc_link *link);
32/*
33 *  Function: program_hpd_filter
34 *
35 *  @brief
36 *     Programs HPD filter on associated HPD line to default values.
37 *
38 *  @return
39 *     true on success, false otherwise
40 */
41bool program_hpd_filter(const struct dc_link *link);
42/* Query hot plug status of USB4 DP tunnel.
43 * Returns true if HPD high.
44 */
45bool dpia_query_hpd_status(struct dc_link *link);
46bool query_hpd_status(struct dc_link *link, uint32_t *is_hpd_high);
47bool link_get_hpd_state(struct dc_link *link);
48struct gpio *link_get_hpd_gpio(struct dc_bios *dcb,
49		struct graphics_object_id link_id,
50		struct gpio_service *gpio_service);
51void link_enable_hpd(const struct dc_link *link);
52void link_disable_hpd(const struct dc_link *link);
53void link_enable_hpd_filter(struct dc_link *link, bool enable);
54#endif /* __DC_LINK_HPD_H__ */
55