1/*
2 * Copyright © 2014 Red Hat 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#ifndef DRM_DISPLAYID_H
23#define DRM_DISPLAYID_H
24
25#include <linux/types.h>
26#include <linux/bits.h>
27
28struct drm_edid;
29
30#define VESA_IEEE_OUI 0x3a0292
31
32/* DisplayID Structure versions */
33#define DISPLAY_ID_STRUCTURE_VER_12 0x12
34#define DISPLAY_ID_STRUCTURE_VER_20 0x20
35
36/* DisplayID Structure v1r2 Data Blocks */
37#define DATA_BLOCK_PRODUCT_ID 0x00
38#define DATA_BLOCK_DISPLAY_PARAMETERS 0x01
39#define DATA_BLOCK_COLOR_CHARACTERISTICS 0x02
40#define DATA_BLOCK_TYPE_1_DETAILED_TIMING 0x03
41#define DATA_BLOCK_TYPE_2_DETAILED_TIMING 0x04
42#define DATA_BLOCK_TYPE_3_SHORT_TIMING 0x05
43#define DATA_BLOCK_TYPE_4_DMT_TIMING 0x06
44#define DATA_BLOCK_VESA_TIMING 0x07
45#define DATA_BLOCK_CEA_TIMING 0x08
46#define DATA_BLOCK_VIDEO_TIMING_RANGE 0x09
47#define DATA_BLOCK_PRODUCT_SERIAL_NUMBER 0x0a
48#define DATA_BLOCK_GP_ASCII_STRING 0x0b
49#define DATA_BLOCK_DISPLAY_DEVICE_DATA 0x0c
50#define DATA_BLOCK_INTERFACE_POWER_SEQUENCING 0x0d
51#define DATA_BLOCK_TRANSFER_CHARACTERISTICS 0x0e
52#define DATA_BLOCK_DISPLAY_INTERFACE 0x0f
53#define DATA_BLOCK_STEREO_DISPLAY_INTERFACE 0x10
54#define DATA_BLOCK_TILED_DISPLAY 0x12
55#define DATA_BLOCK_VENDOR_SPECIFIC 0x7f
56#define DATA_BLOCK_CTA 0x81
57
58/* DisplayID Structure v2r0 Data Blocks */
59#define DATA_BLOCK_2_PRODUCT_ID 0x20
60#define DATA_BLOCK_2_DISPLAY_PARAMETERS 0x21
61#define DATA_BLOCK_2_TYPE_7_DETAILED_TIMING 0x22
62#define DATA_BLOCK_2_TYPE_8_ENUMERATED_TIMING 0x23
63#define DATA_BLOCK_2_TYPE_9_FORMULA_TIMING 0x24
64#define DATA_BLOCK_2_DYNAMIC_VIDEO_TIMING 0x25
65#define DATA_BLOCK_2_DISPLAY_INTERFACE_FEATURES 0x26
66#define DATA_BLOCK_2_STEREO_DISPLAY_INTERFACE 0x27
67#define DATA_BLOCK_2_TILED_DISPLAY_TOPOLOGY 0x28
68#define DATA_BLOCK_2_CONTAINER_ID 0x29
69#define DATA_BLOCK_2_VENDOR_SPECIFIC 0x7e
70#define DATA_BLOCK_2_CTA_DISPLAY_ID 0x81
71
72/* DisplayID Structure v1r2 Product Type */
73#define PRODUCT_TYPE_EXTENSION 0
74#define PRODUCT_TYPE_TEST 1
75#define PRODUCT_TYPE_PANEL 2
76#define PRODUCT_TYPE_MONITOR 3
77#define PRODUCT_TYPE_TV 4
78#define PRODUCT_TYPE_REPEATER 5
79#define PRODUCT_TYPE_DIRECT_DRIVE 6
80
81/* DisplayID Structure v2r0 Display Product Primary Use Case (~Product Type) */
82#define PRIMARY_USE_EXTENSION 0
83#define PRIMARY_USE_TEST 1
84#define PRIMARY_USE_GENERIC 2
85#define PRIMARY_USE_TV 3
86#define PRIMARY_USE_DESKTOP_PRODUCTIVITY 4
87#define PRIMARY_USE_DESKTOP_GAMING 5
88#define PRIMARY_USE_PRESENTATION 6
89#define PRIMARY_USE_HEAD_MOUNTED_VR 7
90#define PRIMARY_USE_HEAD_MOUNTED_AR 8
91
92struct displayid_header {
93 u8 rev;
94 u8 bytes;
95 u8 prod_id;
96 u8 ext_count;
97} __packed;
98
99struct displayid_block {
100 u8 tag;
101 u8 rev;
102 u8 num_bytes;
103} __packed;
104
105struct displayid_tiled_block {
106 struct displayid_block base;
107 u8 tile_cap;
108 u8 topo[3];
109 u8 tile_size[4];
110 u8 tile_pixel_bezel[5];
111 u8 topology_id[8];
112} __packed;
113
114struct displayid_detailed_timings_1 {
115 u8 pixel_clock[3];
116 u8 flags;
117 u8 hactive[2];
118 u8 hblank[2];
119 u8 hsync[2];
120 u8 hsw[2];
121 u8 vactive[2];
122 u8 vblank[2];
123 u8 vsync[2];
124 u8 vsw[2];
125} __packed;
126
127struct displayid_detailed_timing_block {
128 struct displayid_block base;
129 struct displayid_detailed_timings_1 timings[];
130};
131
132#define DISPLAYID_VESA_MSO_OVERLAP GENMASK(3, 0)
133#define DISPLAYID_VESA_MSO_MODE GENMASK(6, 5)
134
135struct displayid_vesa_vendor_specific_block {
136 struct displayid_block base;
137 u8 oui[3];
138 u8 data_structure_type;
139 u8 mso;
140} __packed;
141
142/*
143 * DisplayID iteration.
144 *
145 * Do not access directly, this is private.
146 */
147struct displayid_iter {
148 const struct drm_edid *drm_edid;
149
150 const u8 *section;
151 int length;
152 int idx;
153 int ext_index;
154
155 u8 version;
156 u8 primary_use;
157};
158
159void displayid_iter_edid_begin(const struct drm_edid *drm_edid,
160 struct displayid_iter *iter);
161const struct displayid_block *
162__displayid_iter_next(struct displayid_iter *iter);
163#define displayid_iter_for_each(__block, __iter) \
164 while (((__block) = __displayid_iter_next(__iter)))
165void displayid_iter_end(struct displayid_iter *iter);
166
167u8 displayid_version(const struct displayid_iter *iter);
168u8 displayid_primary_use(const struct displayid_iter *iter);
169
170#endif
171

source code of linux/include/drm/drm_displayid.h