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->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
 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->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}