drivers/gpu/drm/amd/display/dc/link/protocols/link_dp_dpia.c

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