/*
 * Copyright 2023 Advanced Micro Devices, Inc.
 *
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated documentation files (the "Software"),
 * to deal in the Software without restriction, including without limitation
 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
 * and/or sell copies of the Software, and to permit persons to whom the
 * Software is furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
 * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
 * OTHER DEALINGS IN THE SOFTWARE.
 *
 * Authors: AMD
 *
 */
/* FILE POLICY AND INTENDED USAGE:
 * This file implements accessors to link resource.
 */

#include "link_resource.h"
#include "protocols/link_dp_capability.h"

void link_get_cur_link_res(const struct dc_link *link,
                struct link_resource *link_res)
{
        int i;
        struct pipe_ctx *pipe = NULL;

        memset(link_res, 0, sizeof(*link_res));

        for (i = 0; i < MAX_PIPES; i++) {
                pipe = &link->dc->current_state->res_ctx.pipe_ctx[i];
                if (pipe->stream && pipe->stream->link && pipe->top_pipe == NULL) {
                        if (pipe->stream->link == link) {
                                *link_res = pipe->link_res;
                                break;
                        }
                }
        }

}

void link_get_cur_res_map(const struct dc *dc, uint32_t *map)
{
        struct dc_link *link;
        uint32_t i;
        uint32_t hpo_dp_recycle_map = 0;

        *map = 0;

        if (dc->caps.dp_hpo) {
                for (i = 0; i < dc->caps.max_links; i++) {
                        link = dc->links[i];
                        if (link->link_status.link_active &&
                                        link_dp_get_encoding_format(&link->reported_link_cap) == DP_128b_132b_ENCODING &&
                                        link_dp_get_encoding_format(&link->cur_link_settings) != DP_128b_132b_ENCODING)
                                /* hpo dp link encoder is considered as recycled, when RX reports 128b/132b encoding capability
                                 * but current link doesn't use it.
                                 */
                                hpo_dp_recycle_map |= (1 << i);
                }
                *map |= (hpo_dp_recycle_map << LINK_RES_HPO_DP_REC_MAP__SHIFT);
        }
}

void link_restore_res_map(const struct dc *dc, uint32_t *map)
{
        struct dc_link *link;
        uint32_t i;
        unsigned int available_hpo_dp_count;
        uint32_t hpo_dp_recycle_map = (*map & LINK_RES_HPO_DP_REC_MAP__MASK)
                        >> LINK_RES_HPO_DP_REC_MAP__SHIFT;

        if (dc->caps.dp_hpo) {
                available_hpo_dp_count = dc->res_pool->hpo_dp_link_enc_count;
                /* remove excess 128b/132b encoding support for not recycled links */
                for (i = 0; i < dc->caps.max_links; i++) {
                        if ((hpo_dp_recycle_map & (1 << i)) == 0) {
                                link = dc->links[i];
                                if (link->type != dc_connection_none &&
                                                link_dp_get_encoding_format(&link->verified_link_cap) == DP_128b_132b_ENCODING) {
                                        if (available_hpo_dp_count > 0)
                                                available_hpo_dp_count--;
                                        else
                                                /* remove 128b/132b encoding capability by limiting verified link rate to HBR3 */
                                                link->verified_link_cap.link_rate = LINK_RATE_HIGH3;
                                }
                        }
                }
                /* remove excess 128b/132b encoding support for recycled links */
                for (i = 0; i < dc->caps.max_links; i++) {
                        if ((hpo_dp_recycle_map & (1 << i)) != 0) {
                                link = dc->links[i];
                                if (link->type != dc_connection_none &&
                                                link_dp_get_encoding_format(&link->verified_link_cap) == DP_128b_132b_ENCODING) {
                                        if (available_hpo_dp_count > 0)
                                                available_hpo_dp_count--;
                                        else
                                                /* remove 128b/132b encoding capability by limiting verified link rate to HBR3 */
                                                link->verified_link_cap.link_rate = LINK_RATE_HIGH3;
                                }
                        }
                }
        }
}