1/*
2 * Copyright 2023 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/* FILE POLICY AND INTENDED USAGE:
26 * This file implements accessors to link resource.
27 */
28
29#include "link_resource.h"
30#include "protocols/link_dp_capability.h"
31
32void link_get_cur_link_res(const struct dc_link *link,
33 struct link_resource *link_res)
34{
35 int i;
36 struct pipe_ctx *pipe = NULL;
37
38 memset(link_res, 0, sizeof(*link_res));
39
40 for (i = 0; i < MAX_PIPES; i++) {
41 pipe = &link->dc->current_state->res_ctx.pipe_ctx[i];
42 if (pipe->stream && pipe->stream->link && pipe->top_pipe == NULL) {
43 if (pipe->stream->link == link) {
44 *link_res = pipe->link_res;
45 break;
46 }
47 }
48 }
49
50}
51
52void link_get_cur_res_map(const struct dc *dc, uint32_t *map)
53{
54 struct dc_link *link;
55 uint32_t i;
56 uint32_t hpo_dp_recycle_map = 0;
57
58 *map = 0;
59
60 if (dc->caps.dp_hpo) {
61 for (i = 0; i < dc->caps.max_links; i++) {
62 link = dc->links[i];
63 if (link->link_status.link_active &&
64 link_dp_get_encoding_format(link_settings: &link->reported_link_cap) == DP_128b_132b_ENCODING &&
65 link_dp_get_encoding_format(link_settings: &link->cur_link_settings) != DP_128b_132b_ENCODING)
66 /* hpo dp link encoder is considered as recycled, when RX reports 128b/132b encoding capability
67 * but current link doesn't use it.
68 */
69 hpo_dp_recycle_map |= (1 << i);
70 }
71 *map |= (hpo_dp_recycle_map << LINK_RES_HPO_DP_REC_MAP__SHIFT);
72 }
73}
74
75void link_restore_res_map(const struct dc *dc, uint32_t *map)
76{
77 struct dc_link *link;
78 uint32_t i;
79 unsigned int available_hpo_dp_count;
80 uint32_t hpo_dp_recycle_map = (*map & LINK_RES_HPO_DP_REC_MAP__MASK)
81 >> LINK_RES_HPO_DP_REC_MAP__SHIFT;
82
83 if (dc->caps.dp_hpo) {
84 available_hpo_dp_count = dc->res_pool->hpo_dp_link_enc_count;
85 /* remove excess 128b/132b encoding support for not recycled links */
86 for (i = 0; i < dc->caps.max_links; i++) {
87 if ((hpo_dp_recycle_map & (1 << i)) == 0) {
88 link = dc->links[i];
89 if (link->type != dc_connection_none &&
90 link_dp_get_encoding_format(link_settings: &link->verified_link_cap) == DP_128b_132b_ENCODING) {
91 if (available_hpo_dp_count > 0)
92 available_hpo_dp_count--;
93 else
94 /* remove 128b/132b encoding capability by limiting verified link rate to HBR3 */
95 link->verified_link_cap.link_rate = LINK_RATE_HIGH3;
96 }
97 }
98 }
99 /* remove excess 128b/132b encoding support for recycled links */
100 for (i = 0; i < dc->caps.max_links; i++) {
101 if ((hpo_dp_recycle_map & (1 << i)) != 0) {
102 link = dc->links[i];
103 if (link->type != dc_connection_none &&
104 link_dp_get_encoding_format(link_settings: &link->verified_link_cap) == DP_128b_132b_ENCODING) {
105 if (available_hpo_dp_count > 0)
106 available_hpo_dp_count--;
107 else
108 /* remove 128b/132b encoding capability by limiting verified link rate to HBR3 */
109 link->verified_link_cap.link_rate = LINK_RATE_HIGH3;
110 }
111 }
112 }
113 }
114}
115

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