1/*
2 * Copyright 2021 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 DC_INC_LINK_ENC_CFG_H_
27#define DC_INC_LINK_ENC_CFG_H_
28
29/* This module implements functionality for dynamically assigning DIG link
30 * encoder resources to display endpoints (links).
31 */
32
33#include "core_types.h"
34
35/*
36 * Initialise link encoder resource tracking.
37 */
38void link_enc_cfg_init(
39 const struct dc *dc,
40 struct dc_state *state);
41
42/*
43 * Copies a link encoder assignment from another state.
44 */
45void link_enc_cfg_copy(const struct dc_state *src_ctx, struct dc_state *dst_ctx);
46
47/*
48 * Algorithm for assigning available DIG link encoders to streams.
49 *
50 * Update link_enc_assignments table and link_enc_avail list accordingly in
51 * struct resource_context.
52 *
53 * Loop over all streams twice:
54 * a) First assign encoders to unmappable endpoints.
55 * b) Then assign encoders to mappable endpoints.
56 */
57void link_enc_cfg_link_encs_assign(
58 struct dc *dc,
59 struct dc_state *state,
60 struct dc_stream_state *streams[],
61 uint8_t stream_count);
62
63/*
64 * Unassign a link encoder from a stream.
65 *
66 * Update link_enc_assignments table and link_enc_avail list accordingly in
67 * struct resource_context.
68 */
69void link_enc_cfg_link_enc_unassign(
70 struct dc_state *state,
71 struct dc_stream_state *stream);
72
73/*
74 * Check whether the transmitter driven by a link encoder is a mappable
75 * endpoint.
76 */
77bool link_enc_cfg_is_transmitter_mappable(
78 struct dc *dc,
79 struct link_encoder *link_enc);
80
81/* Return stream using DIG link encoder resource. NULL if unused. */
82struct dc_stream_state *link_enc_cfg_get_stream_using_link_enc(
83 struct dc *dc,
84 enum engine_id eng_id);
85
86/* Return link using DIG link encoder resource. NULL if unused. */
87struct dc_link *link_enc_cfg_get_link_using_link_enc(
88 struct dc *dc,
89 enum engine_id eng_id);
90
91/* Return DIG link encoder used by link. NULL if unused. */
92struct link_encoder *link_enc_cfg_get_link_enc_used_by_link(
93 struct dc *dc,
94 const struct dc_link *link);
95
96/* Return next available DIG link encoder. NULL if none available. */
97struct link_encoder *link_enc_cfg_get_next_avail_link_enc(struct dc *dc);
98
99/* Return DIG link encoder. NULL if unused. */
100struct link_encoder *link_enc_cfg_get_link_enc(const struct dc_link *link);
101
102/* Return DIG link encoder used by stream in current/previous state. NULL if unused. */
103struct link_encoder *link_enc_cfg_get_link_enc_used_by_stream_current(
104 struct dc *dc,
105 const struct dc_stream_state *stream);
106
107/* Return true if encoder available to use. */
108bool link_enc_cfg_is_link_enc_avail(struct dc *dc, enum engine_id eng_id, struct dc_link *link);
109
110/* Returns true if encoder assignments in supplied state pass validity checks. */
111bool link_enc_cfg_validate(struct dc *dc, struct dc_state *state);
112
113/* Set the link encoder assignment mode for the current_state to LINK_ENC_CFG_TRANSIENT mode.
114 * This indicates that a new_state is in the process of being applied to hardware.
115 * During this transition, old and new encoder assignments should be accessible from the old_state.
116 * Only allow transition into transient mode if new encoder assignments are valid.
117 */
118void link_enc_cfg_set_transient_mode(struct dc *dc, struct dc_state *current_state, struct dc_state *new_state);
119
120#endif /* DC_INC_LINK_ENC_CFG_H_ */
121

source code of linux/drivers/gpu/drm/amd/display/dc/inc/link_enc_cfg.h