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/*
* Copyright 2022 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
*
*/
#ifndef __DC_LINK_H__
#define __DC_LINK_H__
/* FILE POLICY AND INTENDED USAGE:
*
* This header declares link functions exposed to dc. All functions must have
* "link_" as prefix. For example link_run_my_function. This header is strictly
* private in dc and should never be included in other header files. dc
* components should include this header in their .c files in order to access
* functions in link folder. This file should never include any header files in
* link folder. If there is a need to expose a function declared in one of
* header files in side link folder, you need to move the function declaration
* into this file and prefix it with "link_".
*/
#include "core_types.h"
#include "dc_link.h"
struct gpio *link_get_hpd_gpio(struct dc_bios *dcb,
struct graphics_object_id link_id,
struct gpio_service *gpio_service);
struct ddc_service_init_data {
struct graphics_object_id id;
struct dc_context *ctx;
struct dc_link *link;
bool is_dpia_link;
};
struct ddc_service *link_create_ddc_service(
struct ddc_service_init_data *ddc_init_data);
void link_destroy_ddc_service(struct ddc_service **ddc);
bool link_is_in_aux_transaction_mode(struct ddc_service *ddc);
bool link_query_ddc_data(
struct ddc_service *ddc,
uint32_t address,
uint8_t *write_buf,
uint32_t write_size,
uint8_t *read_buf,
uint32_t read_size);
/* Attempt to submit an aux payload, retrying on timeouts, defers, and busy
* states as outlined in the DP spec. Returns true if the request was
* successful.
*
* NOTE: The function requires explicit mutex on DM side in order to prevent
* potential race condition. DC components should call the dpcd read/write
* function in dm_helpers in order to access dpcd safely
*/
bool link_aux_transfer_with_retries_no_mutex(struct ddc_service *ddc,
struct aux_payload *payload);
uint32_t link_get_aux_defer_delay(struct ddc_service *ddc);
bool link_is_dp_128b_132b_signal(struct pipe_ctx *pipe_ctx);
enum dp_link_encoding link_dp_get_encoding_format(
const struct dc_link_settings *link_settings);
bool link_decide_link_settings(
struct dc_stream_state *stream,
struct dc_link_settings *link_setting);
#endif /* __DC_LINK_HPD_H__ */
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