1/*
2 * Copyright 2012-15 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
26#ifndef __DAL_DDC_SERVICE_H__
27#define __DAL_DDC_SERVICE_H__
28
29#include "link.h"
30
31#define AUX_POWER_UP_WA_DELAY 500
32#define I2C_OVER_AUX_DEFER_WA_DELAY 70
33#define DPVGA_DONGLE_AUX_DEFER_WA_DELAY 40
34#define I2C_OVER_AUX_DEFER_WA_DELAY_1MS 1
35#define LINK_AUX_DEFAULT_LTTPR_TIMEOUT_PERIOD 3200 /*us*/
36#define LINK_AUX_DEFAULT_TIMEOUT_PERIOD 552 /*us*/
37
38#define EDID_SEGMENT_SIZE 256
39
40struct ddc_service *link_create_ddc_service(
41 struct ddc_service_init_data *ddc_init_data);
42
43void link_destroy_ddc_service(struct ddc_service **ddc);
44
45void set_ddc_transaction_type(
46 struct ddc_service *ddc,
47 enum ddc_transaction_type type);
48
49uint32_t link_get_aux_defer_delay(struct ddc_service *ddc);
50
51bool link_is_in_aux_transaction_mode(struct ddc_service *ddc);
52
53bool try_to_configure_aux_timeout(struct ddc_service *ddc,
54 uint32_t timeout);
55
56bool link_query_ddc_data(
57 struct ddc_service *ddc,
58 uint32_t address,
59 uint8_t *write_buf,
60 uint32_t write_size,
61 uint8_t *read_buf,
62 uint32_t read_size);
63
64/* Attempt to submit an aux payload, retrying on timeouts, defers, and busy
65 * states as outlined in the DP spec. Returns true if the request was
66 * successful.
67 *
68 * NOTE: The function requires explicit mutex on DM side in order to prevent
69 * potential race condition. DC components should call the dpcd read/write
70 * function in dm_helpers in order to access dpcd safely
71 */
72bool link_aux_transfer_with_retries_no_mutex(struct ddc_service *ddc,
73 struct aux_payload *payload);
74
75bool link_configure_fixed_vs_pe_retimer(
76 struct ddc_service *ddc,
77 const uint8_t *data,
78 uint32_t length);
79
80bool link_query_fixed_vs_pe_retimer(
81 struct ddc_service *ddc,
82 uint8_t *data,
83 uint32_t length);
84
85uint32_t link_get_fixed_vs_pe_retimer_read_address(struct dc_link *link);
86uint32_t link_get_fixed_vs_pe_retimer_write_address(struct dc_link *link);
87
88
89void write_scdc_data(
90 struct ddc_service *ddc_service,
91 uint32_t pix_clk,
92 bool lte_340_scramble);
93
94void read_scdc_data(
95 struct ddc_service *ddc_service);
96
97void set_dongle_type(struct ddc_service *ddc,
98 enum display_dongle_type dongle_type);
99
100struct ddc *get_ddc_pin(struct ddc_service *ddc_service);
101
102int link_aux_transfer_raw(struct ddc_service *ddc,
103 struct aux_payload *payload,
104 enum aux_return_code_type *operation_result);
105#endif /* __DAL_DDC_SERVICE_H__ */
106
107

source code of linux/drivers/gpu/drm/amd/display/dc/link/protocols/link_ddc.h