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 "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
  49 enum 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
  81 bool 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         bool is_hpd_high = false;
  86
  87         /* prepare QUERY_HPD command */
  88         cmd.query_hpd.header.type = DMUB_CMD__QUERY_HPD_STATE;
  89         cmd.query_hpd.data.instance = link->link_id.enum_id - ENUM_ID_1;
  90         cmd.query_hpd.data.ch_type = AUX_CHANNEL_DPIA;
  91
  92         /* Return HPD status reported by DMUB if query successfully executed. */
  93         if (dm_execute_dmub_cmd(dmub_srv->ctx, &cmd, DM_DMUB_WAIT_TYPE_WAIT_WITH_REPLY) && cmd.query_hpd.data.status == AUX_RET_SUCCESS)
  94                 is_hpd_high = cmd.query_hpd.data.result;
  95
  96         DC_LOG_DEBUG("%s: link(%d) dpia(%d) cmd_status(%d) result(%d)\n",
  97                 __func__,
  98                 link->link_index,
  99                 link->link_id.enum_id - ENUM_ID_1,
 100                 cmd.query_hpd.data.status,
 101                 cmd.query_hpd.data.result);
 102
 103         return is_hpd_high;
 104 }
 105