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/* FILE POLICY AND INTENDED USAGE:
27 *
28 */
29#include "link_dp_training_auxless.h"
30#include "link_dp_phy.h"
31#define DC_LOGGER \
32 link->ctx->logger
33bool dp_perform_link_training_skip_aux(
34 struct dc_link *link,
35 const struct link_resource *link_res,
36 const struct dc_link_settings *link_setting)
37{
38 struct link_training_settings lt_settings = {0};
39
40 dp_decide_training_settings(
41 link,
42 link_settings: link_setting,
43 lt_settings: &lt_settings);
44 override_training_settings(
45 link,
46 overrides: &link->preferred_training_settings,
47 lt_settings: &lt_settings);
48
49 /* 1. Perform_clock_recovery_sequence. */
50
51 /* transmit training pattern for clock recovery */
52 dp_set_hw_training_pattern(link, link_res, pattern: lt_settings.pattern_for_cr, offset: DPRX);
53
54 /* call HWSS to set lane settings*/
55 dp_set_hw_lane_settings(link, link_res, link_settings: &lt_settings, offset: DPRX);
56
57 /* wait receiver to lock-on*/
58 dp_wait_for_training_aux_rd_interval(link, wait_in_micro_secs: lt_settings.cr_pattern_time);
59
60 /* 2. Perform_channel_equalization_sequence. */
61
62 /* transmit training pattern for channel equalization. */
63 dp_set_hw_training_pattern(link, link_res, pattern: lt_settings.pattern_for_eq, offset: DPRX);
64
65 /* call HWSS to set lane settings*/
66 dp_set_hw_lane_settings(link, link_res, link_settings: &lt_settings, offset: DPRX);
67
68 /* wait receiver to lock-on. */
69 dp_wait_for_training_aux_rd_interval(link, wait_in_micro_secs: lt_settings.eq_pattern_time);
70
71 /* 3. Perform_link_training_int. */
72
73 /* Mainlink output idle pattern. */
74 dp_set_hw_test_pattern(link, link_res, test_pattern: DP_TEST_PATTERN_VIDEO_MODE, NULL, custom_pattern_size: 0);
75
76 dp_log_training_result(link, lt_settings: &lt_settings, status: LINK_TRAINING_SUCCESS);
77
78 return true;
79}
80

source code of linux/drivers/gpu/drm/amd/display/dc/link/protocols/link_dp_training_auxless.c