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Tom Wai-Hong Tamd46b5f72012-12-05 14:46:39 +00001/*
2 * Copyright (c) 2012 The Chromium OS Authors.
3 *
4 * (C) Copyright 2010
5 * Petr Stetiar <ynezz@true.cz>
6 *
Wolfgang Denk1a459662013-07-08 09:37:19 +02007 * SPDX-License-Identifier: GPL-2.0+
Tom Wai-Hong Tamd46b5f72012-12-05 14:46:39 +00008 *
9 * Contains stolen code from ddcprobe project which is:
10 * Copyright (C) Nalin Dahyabhai <bigfun@pobox.com>
Tom Wai-Hong Tamd46b5f72012-12-05 14:46:39 +000011 */
12
13#ifndef __EDID_H_
14#define __EDID_H_
15
16#include <linux/types.h>
17
Simon Glass00cf1162015-04-14 21:03:37 -060018/* Size of the EDID data */
19#define EDID_SIZE 128
Simon Glass2dcf1432016-01-21 19:45:00 -070020#define EDID_EXT_SIZE 256
Simon Glass00cf1162015-04-14 21:03:37 -060021
Tom Wai-Hong Tamd46b5f72012-12-05 14:46:39 +000022#define GET_BIT(_x, _pos) \
23 (((_x) >> (_pos)) & 1)
24#define GET_BITS(_x, _pos_msb, _pos_lsb) \
25 (((_x) >> (_pos_lsb)) & ((1 << ((_pos_msb) - (_pos_lsb) + 1)) - 1))
26
27/* Aspect ratios used in EDID info. */
28enum edid_aspect {
29 ASPECT_625 = 0,
30 ASPECT_75,
31 ASPECT_8,
32 ASPECT_5625,
33};
34
35/* Detailed timing information used in EDID v1.x */
36struct edid_detailed_timing {
37 unsigned char pixel_clock[2];
38#define EDID_DETAILED_TIMING_PIXEL_CLOCK(_x) \
39 (((((uint32_t)(_x).pixel_clock[1]) << 8) + \
40 (_x).pixel_clock[0]) * 10000)
41 unsigned char horizontal_active;
42 unsigned char horizontal_blanking;
43 unsigned char horizontal_active_blanking_hi;
44#define EDID_DETAILED_TIMING_HORIZONTAL_ACTIVE(_x) \
45 ((GET_BITS((_x).horizontal_active_blanking_hi, 7, 4) << 8) + \
46 (_x).horizontal_active)
47#define EDID_DETAILED_TIMING_HORIZONTAL_BLANKING(_x) \
48 ((GET_BITS((_x).horizontal_active_blanking_hi, 3, 0) << 8) + \
49 (_x).horizontal_blanking)
50 unsigned char vertical_active;
51 unsigned char vertical_blanking;
52 unsigned char vertical_active_blanking_hi;
53#define EDID_DETAILED_TIMING_VERTICAL_ACTIVE(_x) \
54 ((GET_BITS((_x).vertical_active_blanking_hi, 7, 4) << 8) + \
55 (_x).vertical_active)
56#define EDID_DETAILED_TIMING_VERTICAL_BLANKING(_x) \
57 ((GET_BITS((_x).vertical_active_blanking_hi, 3, 0) << 8) + \
58 (_x).vertical_blanking)
59 unsigned char hsync_offset;
60 unsigned char hsync_pulse_width;
Christian Gmeiner1dc793d2013-08-07 09:22:33 +020061 unsigned char vsync_offset_pulse_width;
Tom Wai-Hong Tamd46b5f72012-12-05 14:46:39 +000062 unsigned char hsync_vsync_offset_pulse_width_hi;
63#define EDID_DETAILED_TIMING_HSYNC_OFFSET(_x) \
64 ((GET_BITS((_x).hsync_vsync_offset_pulse_width_hi, 7, 6) << 8) + \
65 (_x).hsync_offset)
66#define EDID_DETAILED_TIMING_HSYNC_PULSE_WIDTH(_x) \
67 ((GET_BITS((_x).hsync_vsync_offset_pulse_width_hi, 5, 4) << 8) + \
68 (_x).hsync_pulse_width)
69#define EDID_DETAILED_TIMING_VSYNC_OFFSET(_x) \
70 ((GET_BITS((_x).hsync_vsync_offset_pulse_width_hi, 3, 2) << 4) + \
71 GET_BITS((_x).vsync_offset_pulse_width, 7, 4))
72#define EDID_DETAILED_TIMING_VSYNC_PULSE_WIDTH(_x) \
73 ((GET_BITS((_x).hsync_vsync_offset_pulse_width_hi, 1, 0) << 4) + \
74 GET_BITS((_x).vsync_offset_pulse_width, 3, 0))
75 unsigned char himage_size;
76 unsigned char vimage_size;
77 unsigned char himage_vimage_size_hi;
78#define EDID_DETAILED_TIMING_HIMAGE_SIZE(_x) \
79 ((GET_BITS((_x).himage_vimage_size_hi, 7, 4) << 8) + (_x).himage_size)
80#define EDID_DETAILED_TIMING_VIMAGE_SIZE(_x) \
81 ((GET_BITS((_x).himage_vimage_size_hi, 3, 0) << 8) + (_x).vimage_size)
82 unsigned char hborder;
83 unsigned char vborder;
84 unsigned char flags;
85#define EDID_DETAILED_TIMING_FLAG_INTERLACED(_x) \
86 GET_BIT((_x).flags, 7)
87#define EDID_DETAILED_TIMING_FLAG_STEREO(_x) \
88 GET_BITS((_x).flags, 6, 5)
89#define EDID_DETAILED_TIMING_FLAG_DIGITAL_COMPOSITE(_x) \
90 GET_BITS((_x).flags, 4, 3)
91#define EDID_DETAILED_TIMING_FLAG_POLARITY(_x) \
92 GET_BITS((_x).flags, 2, 1)
Hans de Goedeb7ce12d2014-12-19 15:47:37 +010093#define EDID_DETAILED_TIMING_FLAG_VSYNC_POLARITY(_x) \
94 GET_BIT((_x).flags, 2)
95#define EDID_DETAILED_TIMING_FLAG_HSYNC_POLARITY(_x) \
96 GET_BIT((_x).flags, 1)
Tom Wai-Hong Tamd46b5f72012-12-05 14:46:39 +000097#define EDID_DETAILED_TIMING_FLAG_INTERLEAVED(_x) \
98 GET_BIT((_x).flags, 0)
99} __attribute__ ((__packed__));
100
101enum edid_monitor_descriptor_types {
102 EDID_MONITOR_DESCRIPTOR_SERIAL = 0xff,
103 EDID_MONITOR_DESCRIPTOR_ASCII = 0xfe,
104 EDID_MONITOR_DESCRIPTOR_RANGE = 0xfd,
105 EDID_MONITOR_DESCRIPTOR_NAME = 0xfc,
106};
107
108struct edid_monitor_descriptor {
109 uint16_t zero_flag_1;
110 unsigned char zero_flag_2;
111 unsigned char type;
112 unsigned char zero_flag_3;
113 union {
114 char string[13];
115 struct {
116 unsigned char vertical_min;
117 unsigned char vertical_max;
118 unsigned char horizontal_min;
119 unsigned char horizontal_max;
120 unsigned char pixel_clock_max;
121 unsigned char gtf_data[8];
122 } range_data;
123 } data;
124} __attribute__ ((__packed__));
125
126struct edid1_info {
127 unsigned char header[8];
128 unsigned char manufacturer_name[2];
129#define EDID1_INFO_MANUFACTURER_NAME_ZERO(_x) \
130 GET_BIT(((_x).manufacturer_name[0]), 7)
131#define EDID1_INFO_MANUFACTURER_NAME_CHAR1(_x) \
132 GET_BITS(((_x).manufacturer_name[0]), 6, 2)
133#define EDID1_INFO_MANUFACTURER_NAME_CHAR2(_x) \
134 ((GET_BITS(((_x).manufacturer_name[0]), 1, 0) << 3) + \
135 GET_BITS(((_x).manufacturer_name[1]), 7, 5))
136#define EDID1_INFO_MANUFACTURER_NAME_CHAR3(_x) \
137 GET_BITS(((_x).manufacturer_name[1]), 4, 0)
138 unsigned char product_code[2];
139#define EDID1_INFO_PRODUCT_CODE(_x) \
140 (((uint16_t)(_x).product_code[1] << 8) + (_x).product_code[0])
141 unsigned char serial_number[4];
142#define EDID1_INFO_SERIAL_NUMBER(_x) \
143 (((uint32_t)(_x).serial_number[3] << 24) + \
144 ((_x).serial_number[2] << 16) + ((_x).serial_number[1] << 8) + \
145 (_x).serial_number[0])
146 unsigned char week;
147 unsigned char year;
148 unsigned char version;
149 unsigned char revision;
150 unsigned char video_input_definition;
151#define EDID1_INFO_VIDEO_INPUT_DIGITAL(_x) \
152 GET_BIT(((_x).video_input_definition), 7)
153#define EDID1_INFO_VIDEO_INPUT_VOLTAGE_LEVEL(_x) \
154 GET_BITS(((_x).video_input_definition), 6, 5)
155#define EDID1_INFO_VIDEO_INPUT_BLANK_TO_BLACK(_x) \
156 GET_BIT(((_x).video_input_definition), 4)
157#define EDID1_INFO_VIDEO_INPUT_SEPARATE_SYNC(_x) \
158 GET_BIT(((_x).video_input_definition), 3)
159#define EDID1_INFO_VIDEO_INPUT_COMPOSITE_SYNC(_x) \
160 GET_BIT(((_x).video_input_definition), 2)
161#define EDID1_INFO_VIDEO_INPUT_SYNC_ON_GREEN(_x) \
162 GET_BIT(((_x).video_input_definition), 1)
163#define EDID1_INFO_VIDEO_INPUT_SERRATION_V(_x) \
164 GET_BIT(((_x).video_input_definition), 0)
165 unsigned char max_size_horizontal;
166 unsigned char max_size_vertical;
167 unsigned char gamma;
168 unsigned char feature_support;
169#define EDID1_INFO_FEATURE_STANDBY(_x) \
170 GET_BIT(((_x).feature_support), 7)
171#define EDID1_INFO_FEATURE_SUSPEND(_x) \
172 GET_BIT(((_x).feature_support), 6)
173#define EDID1_INFO_FEATURE_ACTIVE_OFF(_x) \
174 GET_BIT(((_x).feature_support), 5)
175#define EDID1_INFO_FEATURE_DISPLAY_TYPE(_x) \
176 GET_BITS(((_x).feature_support), 4, 3)
177#define EDID1_INFO_FEATURE_RGB(_x) \
178 GET_BIT(((_x).feature_support), 2)
179#define EDID1_INFO_FEATURE_PREFERRED_TIMING_MODE(_x) \
180 GET_BIT(((_x).feature_support), 1)
181#define EDID1_INFO_FEATURE_DEFAULT_GTF_SUPPORT(_x) \
182 GET_BIT(((_x).feature_support), 0)
183 unsigned char color_characteristics[10];
184 unsigned char established_timings[3];
185#define EDID1_INFO_ESTABLISHED_TIMING_720X400_70(_x) \
186 GET_BIT(((_x).established_timings[0]), 7)
187#define EDID1_INFO_ESTABLISHED_TIMING_720X400_88(_x) \
188 GET_BIT(((_x).established_timings[0]), 6)
189#define EDID1_INFO_ESTABLISHED_TIMING_640X480_60(_x) \
190 GET_BIT(((_x).established_timings[0]), 5)
191#define EDID1_INFO_ESTABLISHED_TIMING_640X480_67(_x) \
192 GET_BIT(((_x).established_timings[0]), 4)
193#define EDID1_INFO_ESTABLISHED_TIMING_640X480_72(_x) \
194 GET_BIT(((_x).established_timings[0]), 3)
195#define EDID1_INFO_ESTABLISHED_TIMING_640X480_75(_x) \
196 GET_BIT(((_x).established_timings[0]), 2)
197#define EDID1_INFO_ESTABLISHED_TIMING_800X600_56(_x) \
198 GET_BIT(((_x).established_timings[0]), 1)
199#define EDID1_INFO_ESTABLISHED_TIMING_800X600_60(_x) \
200 GET_BIT(((_x).established_timings[0]), 0)
201#define EDID1_INFO_ESTABLISHED_TIMING_800X600_72(_x) \
202 GET_BIT(((_x).established_timings[1]), 7)
203#define EDID1_INFO_ESTABLISHED_TIMING_800X600_75(_x) \
204 GET_BIT(((_x).established_timings[1]), 6)
205#define EDID1_INFO_ESTABLISHED_TIMING_832X624_75(_x) \
206 GET_BIT(((_x).established_timings[1]), 5)
207#define EDID1_INFO_ESTABLISHED_TIMING_1024X768_87I(_x) \
208 GET_BIT(((_x).established_timings[1]), 4)
209#define EDID1_INFO_ESTABLISHED_TIMING_1024X768_60(_x) \
210 GET_BIT(((_x).established_timings[1]), 3)
211#define EDID1_INFO_ESTABLISHED_TIMING_1024X768_70(_x) \
212 GET_BIT(((_x).established_timings[1]), 2)
213#define EDID1_INFO_ESTABLISHED_TIMING_1024X768_75(_x) \
214 GET_BIT(((_x).established_timings[1]), 1)
215#define EDID1_INFO_ESTABLISHED_TIMING_1280X1024_75(_x) \
216 GET_BIT(((_x).established_timings[1]), 0)
217#define EDID1_INFO_ESTABLISHED_TIMING_1152X870_75(_x) \
218 GET_BIT(((_x).established_timings[2]), 7)
219 struct {
220 unsigned char xresolution;
221 unsigned char aspect_vfreq;
222 } __attribute__((__packed__)) standard_timings[8];
223#define EDID1_INFO_STANDARD_TIMING_XRESOLUTION(_x, _i) \
224 (((_x).standard_timings[_i]).xresolution)
225#define EDID1_INFO_STANDARD_TIMING_ASPECT(_x, _i) \
226 GET_BITS(((_x).standard_timings[_i].aspect_vfreq), 7, 6)
227#define EDID1_INFO_STANDARD_TIMING_VFREQ(_x, _i) \
228 GET_BITS(((_x).standard_timings[_i].aspect_vfreq), 5, 0)
229 union {
230 unsigned char timing[72];
231 struct edid_monitor_descriptor descriptor[4];
232 } monitor_details;
233 unsigned char extension_flag;
234 unsigned char checksum;
235} __attribute__ ((__packed__));
236
Hans de Goeded2fabdc2014-12-20 14:30:27 +0100237struct edid_cea861_info {
238 unsigned char extension_tag;
239#define EDID_CEA861_EXTENSION_TAG 0x02
240 unsigned char revision;
241 unsigned char dtd_offset;
242 unsigned char dtd_count;
243#define EDID_CEA861_SUPPORTS_UNDERSCAN(_x) \
244 GET_BIT(((_x).dtd_count), 7)
245#define EDID_CEA861_SUPPORTS_BASIC_AUDIO(_x) \
246 GET_BIT(((_x).dtd_count), 6)
247#define EDID_CEA861_SUPPORTS_YUV444(_x) \
248 GET_BIT(((_x).dtd_count), 5)
249#define EDID_CEA861_SUPPORTS_YUV422(_x) \
250 GET_BIT(((_x).dtd_count), 4)
251#define EDID_CEA861_DTD_COUNT(_x) \
252 GET_BITS(((_x).dtd_count), 3, 0)
253 unsigned char data[124];
254} __attribute__ ((__packed__));
255
Tom Wai-Hong Tamd46b5f72012-12-05 14:46:39 +0000256/**
257 * Print the EDID info.
258 *
259 * @param edid_info The EDID info to be printed
260 */
261void edid_print_info(struct edid1_info *edid_info);
262
263/**
264 * Check the EDID info.
265 *
266 * @param info The EDID info to be checked
267 * @return 0 on valid, or -1 on invalid
268 */
269int edid_check_info(struct edid1_info *info);
270
271/**
Hans de Goedee745d062014-11-24 13:47:13 +0100272 * Check checksum of a 128 bytes EDID data block
273 *
274 * @param edid_block EDID block data
275 *
276 * @return 0 on success, or a negative errno on error
277 */
278int edid_check_checksum(u8 *edid_block);
279
280/**
Tom Wai-Hong Tamd46b5f72012-12-05 14:46:39 +0000281 * Get the horizontal and vertical rate ranges of the monitor.
282 *
283 * @param edid The EDID info
284 * @param hmin Returns the minimum horizontal rate
285 * @param hmax Returns the maxium horizontal rate
286 * @param vmin Returns the minimum vertical rate
287 * @param vmax Returns the maxium vertical rate
288 * @return 0 on success, or -1 on error
289 */
290int edid_get_ranges(struct edid1_info *edid, unsigned int *hmin,
291 unsigned int *hmax, unsigned int *vmin,
292 unsigned int *vmax);
293
Simon Glass00cf1162015-04-14 21:03:37 -0600294struct display_timing;
295
296/**
297 * edid_get_timing() - Get basic digital display parameters
298 *
299 * @param buf Buffer containing EDID data
300 * @param buf_size Size of buffer in bytes
301 * @param timing Place to put preferring timing information
302 * @param panel_bits_per_colourp Place to put the number of bits per
303 * colour supported by the panel. This will be set to
304 * -1 if not available
305 * @return 0 if timings are OK, -ve on error
306 */
307int edid_get_timing(u8 *buf, int buf_size, struct display_timing *timing,
308 int *panel_bits_per_colourp);
309
Tom Wai-Hong Tamd46b5f72012-12-05 14:46:39 +0000310#endif /* __EDID_H_ */