LXR uboot/include/edid.h

   1/*
   2 * Copyright (c) 2012 The Chromium OS Authors.
   3 *
   4 * (C) Copyright 2010
   5 * Petr Stetiar <ynezz@true.cz>
   6 *
   7 * SPDX-License-Identifier:     GPL-2.0+
   8 *
   9 * Contains stolen code from ddcprobe project which is:
  10 * Copyright (C) Nalin Dahyabhai <bigfun@pobox.com>
  11 */
  12
  13#ifndef __EDID_H_
  14#define __EDID_H_
  15
  16#include <linux/types.h>
  17
  18/* Size of the EDID data */
  19#define EDID_SIZE       128
  20#define EDID_EXT_SIZE   256
  21
  22#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;
  61        unsigned char vsync_offset_pulse_width;
  62        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)
  93#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)
  97#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
 237struct 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
 256/**
 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/**
 272 * 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/**
 281 * 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
 294struct 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
 310#endif /* __EDID_H_ */
 311