]> Git Repo - linux.git/blob - drivers/gpu/drm/amd/display/dc/link/link_resource.c
Merge tag 'linux-watchdog-6.14-rc1' of git://www.linux-watchdog.org/linux-watchdog
[linux.git] / drivers / gpu / drm / amd / display / dc / link / link_resource.c
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
32 void 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
52 void 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->reported_link_cap) == DP_128b_132b_ENCODING &&
65                                         link_dp_get_encoding_format(&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
75 void 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->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->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 }
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