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 #include <common.h> 14 #include <edid.h> 15 #include <errno.h> 16 #include <fdtdec.h> 17 #include <linux/ctype.h> 18 #include <linux/string.h> 19 20 int edid_check_info(struct edid1_info *edid_info) 21 { 22 if ((edid_info == NULL) || (edid_info->version == 0)) 23 return -1; 24 25 if (memcmp(edid_info->header, "\x0\xff\xff\xff\xff\xff\xff\x0", 8)) 26 return -1; 27 28 if (edid_info->version == 0xff && edid_info->revision == 0xff) 29 return -1; 30 31 return 0; 32 } 33 34 int edid_check_checksum(u8 *edid_block) 35 { 36 u8 checksum = 0; 37 int i; 38 39 for (i = 0; i < 128; i++) 40 checksum += edid_block[i]; 41 42 return (checksum == 0) ? 0 : -EINVAL; 43 } 44 45 int edid_get_ranges(struct edid1_info *edid, unsigned int *hmin, 46 unsigned int *hmax, unsigned int *vmin, 47 unsigned int *vmax) 48 { 49 int i; 50 struct edid_monitor_descriptor *monitor; 51 52 *hmin = *hmax = *vmin = *vmax = 0; 53 if (edid_check_info(edid)) 54 return -1; 55 56 for (i = 0; i < ARRAY_SIZE(edid->monitor_details.descriptor); i++) { 57 monitor = &edid->monitor_details.descriptor[i]; 58 if (monitor->type == EDID_MONITOR_DESCRIPTOR_RANGE) { 59 *hmin = monitor->data.range_data.horizontal_min; 60 *hmax = monitor->data.range_data.horizontal_max; 61 *vmin = monitor->data.range_data.vertical_min; 62 *vmax = monitor->data.range_data.vertical_max; 63 return 0; 64 } 65 } 66 return -1; 67 } 68 69 /* Set all parts of a timing entry to the same value */ 70 static void set_entry(struct timing_entry *entry, u32 value) 71 { 72 entry->min = value; 73 entry->typ = value; 74 entry->max = value; 75 } 76 77 /** 78 * decode_timing() - Decoding an 18-byte detailed timing record 79 * 80 * @buf: Pointer to EDID detailed timing record 81 * @timing: Place to put timing 82 */ 83 static void decode_timing(u8 *buf, struct display_timing *timing) 84 { 85 uint x_mm, y_mm; 86 unsigned int ha, hbl, hso, hspw, hborder; 87 unsigned int va, vbl, vso, vspw, vborder; 88 struct edid_detailed_timing *t = (struct edid_detailed_timing *)buf; 89 90 /* Edid contains pixel clock in terms of 10KHz */ 91 set_entry(&timing->pixelclock, (buf[0] + (buf[1] << 8)) * 10000); 92 x_mm = (buf[12] + ((buf[14] & 0xf0) << 4)); 93 y_mm = (buf[13] + ((buf[14] & 0x0f) << 8)); 94 ha = (buf[2] + ((buf[4] & 0xf0) << 4)); 95 hbl = (buf[3] + ((buf[4] & 0x0f) << 8)); 96 hso = (buf[8] + ((buf[11] & 0xc0) << 2)); 97 hspw = (buf[9] + ((buf[11] & 0x30) << 4)); 98 hborder = buf[15]; 99 va = (buf[5] + ((buf[7] & 0xf0) << 4)); 100 vbl = (buf[6] + ((buf[7] & 0x0f) << 8)); 101 vso = ((buf[10] >> 4) + ((buf[11] & 0x0c) << 2)); 102 vspw = ((buf[10] & 0x0f) + ((buf[11] & 0x03) << 4)); 103 vborder = buf[16]; 104 105 set_entry(&timing->hactive, ha); 106 set_entry(&timing->hfront_porch, hso); 107 set_entry(&timing->hback_porch, hbl - hso - hspw); 108 set_entry(&timing->hsync_len, hspw); 109 110 set_entry(&timing->vactive, va); 111 set_entry(&timing->vfront_porch, vso); 112 set_entry(&timing->vback_porch, vbl - vso - vspw); 113 set_entry(&timing->vsync_len, vspw); 114 115 timing->flags = 0; 116 if (EDID_DETAILED_TIMING_FLAG_HSYNC_POLARITY(*t)) 117 timing->flags |= DISPLAY_FLAGS_HSYNC_HIGH; 118 else 119 timing->flags |= DISPLAY_FLAGS_HSYNC_LOW; 120 if (EDID_DETAILED_TIMING_FLAG_VSYNC_POLARITY(*t)) 121 timing->flags |= DISPLAY_FLAGS_VSYNC_HIGH; 122 else 123 timing->flags |= DISPLAY_FLAGS_VSYNC_LOW; 124 125 if (EDID_DETAILED_TIMING_FLAG_INTERLACED(*t)) 126 timing->flags = DISPLAY_FLAGS_INTERLACED; 127 128 debug("Detailed mode clock %u Hz, %d mm x %d mm\n" 129 " %04x %04x %04x %04x hborder %x\n" 130 " %04x %04x %04x %04x vborder %x\n", 131 timing->pixelclock.typ, 132 x_mm, y_mm, 133 ha, ha + hso, ha + hso + hspw, 134 ha + hbl, hborder, 135 va, va + vso, va + vso + vspw, 136 va + vbl, vborder); 137 } 138 139 /** 140 * Check if HDMI vendor specific data block is present in CEA block 141 * @param info CEA extension block 142 * @return true if block is found 143 */ 144 static bool cea_is_hdmi_vsdb_present(struct edid_cea861_info *info) 145 { 146 u8 end, i = 0; 147 148 /* check for end of data block */ 149 end = info->dtd_offset; 150 if (end == 0) 151 end = sizeof(info->data); 152 if (end < 4 || end > sizeof(info->data)) 153 return false; 154 end -= 4; 155 156 while (i < end) { 157 /* Look for vendor specific data block of appropriate size */ 158 if ((EDID_CEA861_DB_TYPE(*info, i) == EDID_CEA861_DB_VENDOR) && 159 (EDID_CEA861_DB_LEN(*info, i) >= 5)) { 160 u8 *db = &info->data[i + 1]; 161 u32 oui = db[0] | (db[1] << 8) | (db[2] << 16); 162 163 if (oui == HDMI_IEEE_OUI) 164 return true; 165 } 166 i += EDID_CEA861_DB_LEN(*info, i) + 1; 167 } 168 169 return false; 170 } 171 172 int edid_get_timing(u8 *buf, int buf_size, struct display_timing *timing, 173 int *panel_bits_per_colourp) 174 { 175 struct edid1_info *edid = (struct edid1_info *)buf; 176 bool timing_done; 177 int i; 178 179 if (buf_size < sizeof(*edid) || edid_check_info(edid)) { 180 debug("%s: Invalid buffer\n", __func__); 181 return -EINVAL; 182 } 183 184 if (!EDID1_INFO_FEATURE_PREFERRED_TIMING_MODE(*edid)) { 185 debug("%s: No preferred timing\n", __func__); 186 return -ENOENT; 187 } 188 189 /* Look for detailed timing */ 190 timing_done = false; 191 for (i = 0; i < 4; i++) { 192 struct edid_monitor_descriptor *desc; 193 194 desc = &edid->monitor_details.descriptor[i]; 195 if (desc->zero_flag_1 != 0) { 196 decode_timing((u8 *)desc, timing); 197 timing_done = true; 198 break; 199 } 200 } 201 if (!timing_done) 202 return -EINVAL; 203 204 if (!EDID1_INFO_VIDEO_INPUT_DIGITAL(*edid)) { 205 debug("%s: Not a digital display\n", __func__); 206 return -ENOSYS; 207 } 208 if (edid->version != 1 || edid->revision < 4) { 209 debug("%s: EDID version %d.%d does not have required info\n", 210 __func__, edid->version, edid->revision); 211 *panel_bits_per_colourp = -1; 212 } else { 213 *panel_bits_per_colourp = 214 ((edid->video_input_definition & 0x70) >> 3) + 4; 215 } 216 217 timing->hdmi_monitor = false; 218 if (edid->extension_flag && (buf_size >= EDID_EXT_SIZE)) { 219 struct edid_cea861_info *info = 220 (struct edid_cea861_info *)(buf + sizeof(*edid)); 221 222 if (info->extension_tag == EDID_CEA861_EXTENSION_TAG) 223 timing->hdmi_monitor = cea_is_hdmi_vsdb_present(info); 224 } 225 226 return 0; 227 } 228 229 /** 230 * Snip the tailing whitespace/return of a string. 231 * 232 * @param string The string to be snipped 233 * @return the snipped string 234 */ 235 static char *snip(char *string) 236 { 237 char *s; 238 239 /* 240 * This is always a 13 character buffer 241 * and it's not always terminated. 242 */ 243 string[12] = '\0'; 244 s = &string[strlen(string) - 1]; 245 246 while (s >= string && (isspace(*s) || *s == '\n' || *s == '\r' || 247 *s == '\0')) 248 *(s--) = '\0'; 249 250 return string; 251 } 252 253 /** 254 * Print an EDID monitor descriptor block 255 * 256 * @param monitor The EDID monitor descriptor block 257 * @have_timing Modifies to 1 if the desciptor contains timing info 258 */ 259 static void edid_print_dtd(struct edid_monitor_descriptor *monitor, 260 unsigned int *have_timing) 261 { 262 unsigned char *bytes = (unsigned char *)monitor; 263 struct edid_detailed_timing *timing = 264 (struct edid_detailed_timing *)monitor; 265 266 if (bytes[0] == 0 && bytes[1] == 0) { 267 if (monitor->type == EDID_MONITOR_DESCRIPTOR_SERIAL) 268 printf("Monitor serial number: %s\n", 269 snip(monitor->data.string)); 270 else if (monitor->type == EDID_MONITOR_DESCRIPTOR_ASCII) 271 printf("Monitor ID: %s\n", 272 snip(monitor->data.string)); 273 else if (monitor->type == EDID_MONITOR_DESCRIPTOR_NAME) 274 printf("Monitor name: %s\n", 275 snip(monitor->data.string)); 276 else if (monitor->type == EDID_MONITOR_DESCRIPTOR_RANGE) 277 printf("Monitor range limits, horizontal sync: " 278 "%d-%d kHz, vertical refresh: " 279 "%d-%d Hz, max pixel clock: " 280 "%d MHz\n", 281 monitor->data.range_data.horizontal_min, 282 monitor->data.range_data.horizontal_max, 283 monitor->data.range_data.vertical_min, 284 monitor->data.range_data.vertical_max, 285 monitor->data.range_data.pixel_clock_max * 10); 286 } else { 287 uint32_t pixclock, h_active, h_blanking, v_active, v_blanking; 288 uint32_t h_total, v_total, vfreq; 289 290 pixclock = EDID_DETAILED_TIMING_PIXEL_CLOCK(*timing); 291 h_active = EDID_DETAILED_TIMING_HORIZONTAL_ACTIVE(*timing); 292 h_blanking = EDID_DETAILED_TIMING_HORIZONTAL_BLANKING(*timing); 293 v_active = EDID_DETAILED_TIMING_VERTICAL_ACTIVE(*timing); 294 v_blanking = EDID_DETAILED_TIMING_VERTICAL_BLANKING(*timing); 295 296 h_total = h_active + h_blanking; 297 v_total = v_active + v_blanking; 298 if (v_total > 0 && h_total > 0) 299 vfreq = pixclock / (v_total * h_total); 300 else 301 vfreq = 1; /* Error case */ 302 printf("\t%dx%d\%c\t%d Hz (detailed)\n", h_active, 303 v_active, h_active > 1000 ? ' ' : '\t', vfreq); 304 *have_timing = 1; 305 } 306 } 307 308 /** 309 * Get the manufacturer name from an EDID info. 310 * 311 * @param edid_info The EDID info to be printed 312 * @param name Returns the string of the manufacturer name 313 */ 314 static void edid_get_manufacturer_name(struct edid1_info *edid, char *name) 315 { 316 name[0] = EDID1_INFO_MANUFACTURER_NAME_CHAR1(*edid) + 'A' - 1; 317 name[1] = EDID1_INFO_MANUFACTURER_NAME_CHAR2(*edid) + 'A' - 1; 318 name[2] = EDID1_INFO_MANUFACTURER_NAME_CHAR3(*edid) + 'A' - 1; 319 name[3] = '\0'; 320 } 321 322 void edid_print_info(struct edid1_info *edid_info) 323 { 324 int i; 325 char manufacturer[4]; 326 unsigned int have_timing = 0; 327 uint32_t serial_number; 328 329 if (edid_check_info(edid_info)) { 330 printf("Not a valid EDID\n"); 331 return; 332 } 333 334 printf("EDID version: %d.%d\n", 335 edid_info->version, edid_info->revision); 336 337 printf("Product ID code: %04x\n", EDID1_INFO_PRODUCT_CODE(*edid_info)); 338 339 edid_get_manufacturer_name(edid_info, manufacturer); 340 printf("Manufacturer: %s\n", manufacturer); 341 342 serial_number = EDID1_INFO_SERIAL_NUMBER(*edid_info); 343 if (serial_number != 0xffffffff) { 344 if (strcmp(manufacturer, "MAG") == 0) 345 serial_number -= 0x7000000; 346 if (strcmp(manufacturer, "OQI") == 0) 347 serial_number -= 456150000; 348 if (strcmp(manufacturer, "VSC") == 0) 349 serial_number -= 640000000; 350 } 351 printf("Serial number: %08x\n", serial_number); 352 printf("Manufactured in week: %d year: %d\n", 353 edid_info->week, edid_info->year + 1990); 354 355 printf("Video input definition: %svoltage level %d%s%s%s%s%s\n", 356 EDID1_INFO_VIDEO_INPUT_DIGITAL(*edid_info) ? 357 "digital signal, " : "analog signal, ", 358 EDID1_INFO_VIDEO_INPUT_VOLTAGE_LEVEL(*edid_info), 359 EDID1_INFO_VIDEO_INPUT_BLANK_TO_BLACK(*edid_info) ? 360 ", blank to black" : "", 361 EDID1_INFO_VIDEO_INPUT_SEPARATE_SYNC(*edid_info) ? 362 ", separate sync" : "", 363 EDID1_INFO_VIDEO_INPUT_COMPOSITE_SYNC(*edid_info) ? 364 ", composite sync" : "", 365 EDID1_INFO_VIDEO_INPUT_SYNC_ON_GREEN(*edid_info) ? 366 ", sync on green" : "", 367 EDID1_INFO_VIDEO_INPUT_SERRATION_V(*edid_info) ? 368 ", serration v" : ""); 369 370 printf("Monitor is %s\n", 371 EDID1_INFO_FEATURE_RGB(*edid_info) ? "RGB" : "non-RGB"); 372 373 printf("Maximum visible display size: %d cm x %d cm\n", 374 edid_info->max_size_horizontal, 375 edid_info->max_size_vertical); 376 377 printf("Power management features: %s%s, %s%s, %s%s\n", 378 EDID1_INFO_FEATURE_ACTIVE_OFF(*edid_info) ? 379 "" : "no ", "active off", 380 EDID1_INFO_FEATURE_SUSPEND(*edid_info) ? "" : "no ", "suspend", 381 EDID1_INFO_FEATURE_STANDBY(*edid_info) ? "" : "no ", "standby"); 382 383 printf("Estabilished timings:\n"); 384 if (EDID1_INFO_ESTABLISHED_TIMING_720X400_70(*edid_info)) 385 printf("\t720x400\t\t70 Hz (VGA 640x400, IBM)\n"); 386 if (EDID1_INFO_ESTABLISHED_TIMING_720X400_88(*edid_info)) 387 printf("\t720x400\t\t88 Hz (XGA2)\n"); 388 if (EDID1_INFO_ESTABLISHED_TIMING_640X480_60(*edid_info)) 389 printf("\t640x480\t\t60 Hz (VGA)\n"); 390 if (EDID1_INFO_ESTABLISHED_TIMING_640X480_67(*edid_info)) 391 printf("\t640x480\t\t67 Hz (Mac II, Apple)\n"); 392 if (EDID1_INFO_ESTABLISHED_TIMING_640X480_72(*edid_info)) 393 printf("\t640x480\t\t72 Hz (VESA)\n"); 394 if (EDID1_INFO_ESTABLISHED_TIMING_640X480_75(*edid_info)) 395 printf("\t640x480\t\t75 Hz (VESA)\n"); 396 if (EDID1_INFO_ESTABLISHED_TIMING_800X600_56(*edid_info)) 397 printf("\t800x600\t\t56 Hz (VESA)\n"); 398 if (EDID1_INFO_ESTABLISHED_TIMING_800X600_60(*edid_info)) 399 printf("\t800x600\t\t60 Hz (VESA)\n"); 400 if (EDID1_INFO_ESTABLISHED_TIMING_800X600_72(*edid_info)) 401 printf("\t800x600\t\t72 Hz (VESA)\n"); 402 if (EDID1_INFO_ESTABLISHED_TIMING_800X600_75(*edid_info)) 403 printf("\t800x600\t\t75 Hz (VESA)\n"); 404 if (EDID1_INFO_ESTABLISHED_TIMING_832X624_75(*edid_info)) 405 printf("\t832x624\t\t75 Hz (Mac II)\n"); 406 if (EDID1_INFO_ESTABLISHED_TIMING_1024X768_87I(*edid_info)) 407 printf("\t1024x768\t87 Hz Interlaced (8514A)\n"); 408 if (EDID1_INFO_ESTABLISHED_TIMING_1024X768_60(*edid_info)) 409 printf("\t1024x768\t60 Hz (VESA)\n"); 410 if (EDID1_INFO_ESTABLISHED_TIMING_1024X768_70(*edid_info)) 411 printf("\t1024x768\t70 Hz (VESA)\n"); 412 if (EDID1_INFO_ESTABLISHED_TIMING_1024X768_75(*edid_info)) 413 printf("\t1024x768\t75 Hz (VESA)\n"); 414 if (EDID1_INFO_ESTABLISHED_TIMING_1280X1024_75(*edid_info)) 415 printf("\t1280x1024\t75 (VESA)\n"); 416 if (EDID1_INFO_ESTABLISHED_TIMING_1152X870_75(*edid_info)) 417 printf("\t1152x870\t75 (Mac II)\n"); 418 419 /* Standard timings. */ 420 printf("Standard timings:\n"); 421 for (i = 0; i < ARRAY_SIZE(edid_info->standard_timings); i++) { 422 unsigned int aspect = 10000; 423 unsigned int x, y; 424 unsigned char xres, vfreq; 425 426 xres = EDID1_INFO_STANDARD_TIMING_XRESOLUTION(*edid_info, i); 427 vfreq = EDID1_INFO_STANDARD_TIMING_VFREQ(*edid_info, i); 428 if ((xres != vfreq) || 429 ((xres != 0) && (xres != 1)) || 430 ((vfreq != 0) && (vfreq != 1))) { 431 switch (EDID1_INFO_STANDARD_TIMING_ASPECT(*edid_info, 432 i)) { 433 case ASPECT_625: 434 aspect = 6250; 435 break; 436 case ASPECT_75: 437 aspect = 7500; 438 break; 439 case ASPECT_8: 440 aspect = 8000; 441 break; 442 case ASPECT_5625: 443 aspect = 5625; 444 break; 445 } 446 x = (xres + 31) * 8; 447 y = x * aspect / 10000; 448 printf("\t%dx%d%c\t%d Hz\n", x, y, 449 x > 1000 ? ' ' : '\t', (vfreq & 0x3f) + 60); 450 have_timing = 1; 451 } 452 } 453 454 /* Detailed timing information. */ 455 for (i = 0; i < ARRAY_SIZE(edid_info->monitor_details.descriptor); 456 i++) { 457 edid_print_dtd(&edid_info->monitor_details.descriptor[i], 458 &have_timing); 459 } 460 461 if (!have_timing) 462 printf("\tNone\n"); 463 } 464