1  /* SPDX-License-Identifier: MIT */
2  /*
3   * Copyright 2021 Advanced Micro Devices, Inc.
4   *
5   * Permission is hereby granted, free of charge, to any person obtaining a
6   * copy of this software and associated documentation files (the "Software"),
7   * to deal in the Software without restriction, including without limitation
8   * the rights to use, copy, modify, merge, publish, distribute, sublicense,
9   * and/or sell copies of the Software, and to permit persons to whom the
10   * Software is furnished to do so, subject to the following conditions:
11   *
12   * The above copyright notice and this permission notice shall be included in
13   * all copies or substantial portions of the Software.
14   *
15   * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
16   * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
17   * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
18   * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
19   * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
20   * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
21   * OTHER DEALINGS IN THE SOFTWARE.
22   *
23   * Authors: AMD
24   *
25   */
26  
27  #ifndef __DC_LINK_DPIA_H__
28  #define __DC_LINK_DPIA_H__
29  
30  #include "link.h"
31  
32  /* Read tunneling device capability from DPCD and update link capability
33   * accordingly.
34   */
35  enum dc_status dpcd_get_tunneling_device_data(struct dc_link *link);
36  
37  /* Query hot plug status of USB4 DP tunnel.
38   * Returns true if HPD high.
39   */
40  bool dpia_query_hpd_status(struct dc_link *link);
41  #endif /* __DC_LINK_DPIA_H__ */
42