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			dpcd_dp_tun_data,
 60			sizeof(dpcd_dp_tun_data));
 61
 62	status = core_link_read_dpcd(
 63			link,
 64			DP_USB4_ROUTER_TOPOLOGY_ID,
 65			dpcd_topology_data,
 66			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(dmub_srv->ctx, &cmd,
 93		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