1 /* 2 * Copyright 2022 Advanced Micro Devices, Inc. 3 * 4 * Permission is hereby granted, free of charge, to any person obtaining a 5 * copy of this software and associated documentation files (the "Software"), 6 * to deal in the Software without restriction, including without limitation 7 * the rights to use, copy, modify, merge, publish, distribute, sublicense, 8 * and/or sell copies of the Software, and to permit persons to whom the 9 * Software is furnished to do so, subject to the following conditions: 10 * 11 * The above copyright notice and this permission notice shall be included in 12 * all copies or substantial portions of the Software. 13 * 14 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 15 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 16 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL 17 * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR 18 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, 19 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR 20 * OTHER DEALINGS IN THE SOFTWARE. 21 * 22 * Authors: AMD 23 * 24 */ 25 26 #ifndef __DC_LINK_DP_CAPABILITY_H__ 27 #define __DC_LINK_DP_CAPABILITY_H__ 28 29 #include "link.h" 30 31 bool detect_dp_sink_caps(struct dc_link *link); 32 33 void detect_edp_sink_caps(struct dc_link *link); 34 35 struct dc_link_settings dp_get_max_link_cap(struct dc_link *link); 36 37 38 enum dc_status dp_retrieve_lttpr_cap(struct dc_link *link); 39 40 /* Convert PHY repeater count read from DPCD uint8_t. */ 41 uint8_t dp_parse_lttpr_repeater_count(uint8_t lttpr_repeater_count); 42 43 bool dp_is_lttpr_present(struct dc_link *link); 44 45 bool is_dp_active_dongle(const struct dc_link *link); 46 47 bool is_dp_branch_device(const struct dc_link *link); 48 49 void dpcd_write_cable_id_to_dprx(struct dc_link *link); 50 51 /* Initialize output parameter lt_settings. */ 52 void dp_decide_training_settings( 53 struct dc_link *link, 54 const struct dc_link_settings *link_setting, 55 struct link_training_settings *lt_settings); 56 57 58 bool decide_edp_link_settings_with_dsc(struct dc_link *link, 59 struct dc_link_settings *link_setting, 60 uint32_t req_bw, 61 enum dc_link_rate max_link_rate); 62 63 void dpcd_set_source_specific_data(struct dc_link *link); 64 65 /*query dpcd for version and mst cap addresses*/ 66 bool read_is_mst_supported(struct dc_link *link); 67 68 bool decide_fallback_link_setting( 69 struct dc_link *link, 70 struct dc_link_settings *max, 71 struct dc_link_settings *cur, 72 enum link_training_result training_result); 73 74 bool dp_verify_link_cap_with_retries( 75 struct dc_link *link, 76 struct dc_link_settings *known_limit_link_setting, 77 int attempts); 78 79 #endif /* __DC_LINK_DP_CAPABILITY_H__ */ 80