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 /* This module implements functionality for training DPIA links. */ 31 32 struct dc_link; 33 struct dc_link_settings; 34 35 /* The approximate time (us) it takes to transmit 9 USB4 DP clock sync packets. */ 36 #define DPIA_CLK_SYNC_DELAY 16000 37 38 /* Extend interval between training status checks for manual testing. */ 39 #define DPIA_DEBUG_EXTENDED_AUX_RD_INTERVAL_US 60000000 40 41 /** @note Can remove once DP tunneling registers in upstream include/drm/drm_dp_helper.h */ 42 /* DPCD DP Tunneling over USB4 */ 43 #define DP_TUNNELING_CAPABILITIES_SUPPORT 0xe000d 44 #define DP_IN_ADAPTER_INFO 0xe000e 45 #define DP_USB4_DRIVER_ID 0xe000f 46 #define DP_USB4_ROUTER_TOPOLOGY_ID 0xe001b 47 48 /* SET_CONFIG message types sent by driver. */ 49 enum dpia_set_config_type { 50 DPIA_SET_CFG_SET_LINK = 0x01, 51 DPIA_SET_CFG_SET_PHY_TEST_MODE = 0x05, 52 DPIA_SET_CFG_SET_TRAINING = 0x18, 53 DPIA_SET_CFG_SET_VSPE = 0x19 54 }; 55 56 /* Training stages (TS) in SET_CONFIG(SET_TRAINING) message. */ 57 enum dpia_set_config_ts { 58 DPIA_TS_DPRX_DONE = 0x00, /* Done training DPRX. */ 59 DPIA_TS_TPS1 = 0x01, 60 DPIA_TS_TPS2 = 0x02, 61 DPIA_TS_TPS3 = 0x03, 62 DPIA_TS_TPS4 = 0x07, 63 DPIA_TS_UFP_DONE = 0xff /* Done training DPTX-to-DPIA hop. */ 64 }; 65 66 /* SET_CONFIG message data associated with messages sent by driver. */ 67 union dpia_set_config_data { 68 struct { 69 uint8_t mode : 1; 70 uint8_t reserved : 7; 71 } set_link; 72 struct { 73 uint8_t stage; 74 } set_training; 75 struct { 76 uint8_t swing : 2; 77 uint8_t max_swing_reached : 1; 78 uint8_t pre_emph : 2; 79 uint8_t max_pre_emph_reached : 1; 80 uint8_t reserved : 2; 81 } set_vspe; 82 uint8_t raw; 83 }; 84 85 /* Read tunneling device capability from DPCD and update link capability 86 * accordingly. 87 */ 88 enum dc_status dpcd_get_tunneling_device_data(struct dc_link *link); 89 90 /* Train DP tunneling link for USB4 DPIA display endpoint. 91 * DPIA equivalent of dc_link_dp_perfrorm_link_training. 92 * Aborts link training upon detection of sink unplug. 93 */ 94 enum link_training_result 95 dc_link_dpia_perform_link_training(struct dc_link *link, 96 const struct dc_link_settings *link_setting, 97 bool skip_video_pattern); 98 99 #endif /* __DC_LINK_DPIA_H__ */ 100