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#include "dc.h"
28#include "inc/core_status.h"
29#include "dpcd_defs.h"
30
31#include "link_dp_dpia.h"
32#include "link_hwss.h"
33#include "dm_helpers.h"
34#include "dmub/inc/dmub_cmd.h"
35#include "link_dpcd.h"
36#include "link_dp_training.h"
37#include "dc_dmub_srv.h"
38
39#define DC_LOGGER \
40 link->ctx->logger
41
42/** @note Can remove once DP tunneling registers in upstream include/drm/drm_dp_helper.h */
43/* DPCD DP Tunneling over USB4 */
44#define DP_TUNNELING_CAPABILITIES_SUPPORT 0xe000d
45#define DP_IN_ADAPTER_INFO 0xe000e
46#define DP_USB4_DRIVER_ID 0xe000f
47#define DP_USB4_ROUTER_TOPOLOGY_ID 0xe001b
48
49enum dc_status dpcd_get_tunneling_device_data(struct dc_link *link)
50{
51 enum dc_status status = DC_OK;
52 uint8_t dpcd_dp_tun_data[3] = {0};
53 uint8_t dpcd_topology_data[DPCD_USB4_TOPOLOGY_ID_LEN] = {0};
54 uint8_t i = 0;
55
56 status = core_link_read_dpcd(
57 link,
58 DP_TUNNELING_CAPABILITIES_SUPPORT,
59 data: dpcd_dp_tun_data,
60 size: sizeof(dpcd_dp_tun_data));
61
62 status = core_link_read_dpcd(
63 link,
64 DP_USB4_ROUTER_TOPOLOGY_ID,
65 data: dpcd_topology_data,
66 size: sizeof(dpcd_topology_data));
67
68 link->dpcd_caps.usb4_dp_tun_info.dp_tun_cap.raw =
69 dpcd_dp_tun_data[DP_TUNNELING_CAPABILITIES_SUPPORT - DP_TUNNELING_CAPABILITIES_SUPPORT];
70 link->dpcd_caps.usb4_dp_tun_info.dpia_info.raw =
71 dpcd_dp_tun_data[DP_IN_ADAPTER_INFO - DP_TUNNELING_CAPABILITIES_SUPPORT];
72 link->dpcd_caps.usb4_dp_tun_info.usb4_driver_id =
73 dpcd_dp_tun_data[DP_USB4_DRIVER_ID - DP_TUNNELING_CAPABILITIES_SUPPORT];
74
75 for (i = 0; i < DPCD_USB4_TOPOLOGY_ID_LEN; i++)
76 link->dpcd_caps.usb4_dp_tun_info.usb4_topology_id[i] = dpcd_topology_data[i];
77
78 return status;
79}
80
81bool dpia_query_hpd_status(struct dc_link *link)
82{
83 union dmub_rb_cmd cmd = {0};
84 struct dc_dmub_srv *dmub_srv = link->ctx->dmub_srv;
85
86 /* prepare QUERY_HPD command */
87 cmd.query_hpd.header.type = DMUB_CMD__QUERY_HPD_STATE;
88 cmd.query_hpd.data.instance = link->link_id.enum_id - ENUM_ID_1;
89 cmd.query_hpd.data.ch_type = AUX_CHANNEL_DPIA;
90
91 /* Query dpia hpd status from dmub */
92 if (dc_wake_and_execute_dmub_cmd(ctx: dmub_srv->ctx, cmd: &cmd,
93 wait_type: DM_DMUB_WAIT_TYPE_WAIT_WITH_REPLY) &&
94 cmd.query_hpd.data.status == AUX_RET_SUCCESS) {
95 DC_LOG_DEBUG("%s: for link(%d) dpia(%d) success, current_hpd_status(%d) new_hpd_status(%d)\n",
96 __func__,
97 link->link_index,
98 link->link_id.enum_id - ENUM_ID_1,
99 link->hpd_status,
100 cmd.query_hpd.data.result);
101 link->hpd_status = cmd.query_hpd.data.result;
102 } else {
103 DC_LOG_ERROR("%s: for link(%d) dpia(%d) failed with status(%d), current_hpd_status(%d) new_hpd_status(0)\n",
104 __func__,
105 link->link_index,
106 link->link_id.enum_id - ENUM_ID_1,
107 cmd.query_hpd.data.status,
108 link->hpd_status);
109 link->hpd_status = false;
110 }
111
112 return link->hpd_status;
113}
114
115

source code of linux/drivers/gpu/drm/amd/display/dc/link/protocols/link_dp_dpia.c