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 
31 enum 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  */
41 bool program_hpd_filter(const struct dc_link *link);
42 /* Query hot plug status of USB4 DP tunnel.
43  * Returns true if HPD high.
44  */
45 bool dpia_query_hpd_status(struct dc_link *link);
46 bool query_hpd_status(struct dc_link *link, uint32_t *is_hpd_high);
47 bool link_get_hpd_state(struct dc_link *link);
48 struct gpio *link_get_hpd_gpio(struct dc_bios *dcb,
49 		struct graphics_object_id link_id,
50 		struct gpio_service *gpio_service);
51 void link_enable_hpd(const struct dc_link *link);
52 void link_disable_hpd(const struct dc_link *link);
53 void link_enable_hpd_filter(struct dc_link *link, bool enable);
54 #endif /* __DC_LINK_HPD_H__ */
55