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
dp_perform_link_training_skip_aux(struct dc_link * link,const struct link_resource * link_res,const struct dc_link_settings * link_setting)33 bool 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_res,
43 			link_setting,
44 			&lt_settings);
45 	override_training_settings(
46 			link,
47 			&link->preferred_training_settings,
48 			&lt_settings);
49 
50 	/* 1. Perform_clock_recovery_sequence. */
51 
52 	/* transmit training pattern for clock recovery */
53 	dp_set_hw_training_pattern(link, link_res, lt_settings.pattern_for_cr, DPRX);
54 
55 	/* call HWSS to set lane settings*/
56 	dp_set_hw_lane_settings(link, link_res, &lt_settings, DPRX);
57 
58 	/* wait receiver to lock-on*/
59 	dp_wait_for_training_aux_rd_interval(link, lt_settings.cr_pattern_time);
60 
61 	/* 2. Perform_channel_equalization_sequence. */
62 
63 	/* transmit training pattern for channel equalization. */
64 	dp_set_hw_training_pattern(link, link_res, lt_settings.pattern_for_eq, DPRX);
65 
66 	/* call HWSS to set lane settings*/
67 	dp_set_hw_lane_settings(link, link_res, &lt_settings, DPRX);
68 
69 	/* wait receiver to lock-on. */
70 	dp_wait_for_training_aux_rd_interval(link, lt_settings.eq_pattern_time);
71 
72 	/* 3. Perform_link_training_int. */
73 
74 	/* Mainlink output idle pattern. */
75 	dp_set_hw_test_pattern(link, link_res, DP_TEST_PATTERN_VIDEO_MODE, NULL, 0);
76 
77 	dp_log_training_result(link, &lt_settings, LINK_TRAINING_SUCCESS);
78 
79 	return true;
80 }
81