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 89 /* Edid contains pixel clock in terms of 10KHz */ 90 set_entry(&timing->pixelclock, (buf[0] + (buf[1] << 8)) * 10000); 91 x_mm = (buf[12] + ((buf[14] & 0xf0) << 4)); 92 y_mm = (buf[13] + ((buf[14] & 0x0f) << 8)); 93 ha = (buf[2] + ((buf[4] & 0xf0) << 4)); 94 hbl = (buf[3] + ((buf[4] & 0x0f) << 8)); 95 hso = (buf[8] + ((buf[11] & 0xc0) << 2)); 96 hspw = (buf[9] + ((buf[11] & 0x30) << 4)); 97 hborder = buf[15]; 98 va = (buf[5] + ((buf[7] & 0xf0) << 4)); 99 vbl = (buf[6] + ((buf[7] & 0x0f) << 8)); 100 vso = ((buf[10] >> 4) + ((buf[11] & 0x0c) << 2)); 101 vspw = ((buf[10] & 0x0f) + ((buf[11] & 0x03) << 4)); 102 vborder = buf[16]; 103 104 set_entry(&timing->hactive, ha); 105 set_entry(&timing->hfront_porch, hso); 106 set_entry(&timing->hback_porch, hbl - hso - hspw); 107 set_entry(&timing->hsync_len, hspw); 108 109 set_entry(&timing->vactive, va); 110 set_entry(&timing->vfront_porch, vso); 111 set_entry(&timing->vback_porch, vbl - vso - vspw); 112 set_entry(&timing->vsync_len, vspw); 113 114 debug("Detailed mode clock %u Hz, %d mm x %d mm\n" 115 " %04x %04x %04x %04x hborder %x\n" 116 " %04x %04x %04x %04x vborder %x\n", 117 timing->pixelclock.typ, 118 x_mm, y_mm, 119 ha, ha + hso, ha + hso + hspw, 120 ha + hbl, hborder, 121 va, va + vso, va + vso + vspw, 122 va + vbl, vborder); 123 } 124 125 int edid_get_timing(u8 *buf, int buf_size, struct display_timing *timing, 126 int *panel_bits_per_colourp) 127 { 128 struct edid1_info *edid = (struct edid1_info *)buf; 129 bool timing_done; 130 int i; 131 132 if (buf_size < sizeof(*edid) || edid_check_info(edid)) { 133 debug("%s: Invalid buffer\n", __func__); 134 return -EINVAL; 135 } 136 137 if (!EDID1_INFO_FEATURE_PREFERRED_TIMING_MODE(*edid)) { 138 debug("%s: No preferred timing\n", __func__); 139 return -ENOENT; 140 } 141 142 /* Look for detailed timing */ 143 timing_done = false; 144 for (i = 0; i < 4; i++) { 145 struct edid_monitor_descriptor *desc; 146 147 desc = &edid->monitor_details.descriptor[i]; 148 if (desc->zero_flag_1 != 0) { 149 decode_timing((u8 *)desc, timing); 150 timing_done = true; 151 break; 152 } 153 } 154 if (!timing_done) 155 return -EINVAL; 156 157 if (!EDID1_INFO_VIDEO_INPUT_DIGITAL(*edid)) { 158 debug("%s: Not a digital display\n", __func__); 159 return -ENOSYS; 160 } 161 if (edid->version != 1 || edid->revision < 4) { 162 debug("%s: EDID version %d.%d does not have required info\n", 163 __func__, edid->version, edid->revision); 164 *panel_bits_per_colourp = -1; 165 } else { 166 *panel_bits_per_colourp = 167 ((edid->video_input_definition & 0x70) >> 3) + 4; 168 } 169 170 return 0; 171 } 172 173 /** 174 * Snip the tailing whitespace/return of a string. 175 * 176 * @param string The string to be snipped 177 * @return the snipped string 178 */ 179 static char *snip(char *string) 180 { 181 char *s; 182 183 /* 184 * This is always a 13 character buffer 185 * and it's not always terminated. 186 */ 187 string[12] = '\0'; 188 s = &string[strlen(string) - 1]; 189 190 while (s >= string && (isspace(*s) || *s == '\n' || *s == '\r' || 191 *s == '\0')) 192 *(s--) = '\0'; 193 194 return string; 195 } 196 197 /** 198 * Print an EDID monitor descriptor block 199 * 200 * @param monitor The EDID monitor descriptor block 201 * @have_timing Modifies to 1 if the desciptor contains timing info 202 */ 203 static void edid_print_dtd(struct edid_monitor_descriptor *monitor, 204 unsigned int *have_timing) 205 { 206 unsigned char *bytes = (unsigned char *)monitor; 207 struct edid_detailed_timing *timing = 208 (struct edid_detailed_timing *)monitor; 209 210 if (bytes[0] == 0 && bytes[1] == 0) { 211 if (monitor->type == EDID_MONITOR_DESCRIPTOR_SERIAL) 212 printf("Monitor serial number: %s\n", 213 snip(monitor->data.string)); 214 else if (monitor->type == EDID_MONITOR_DESCRIPTOR_ASCII) 215 printf("Monitor ID: %s\n", 216 snip(monitor->data.string)); 217 else if (monitor->type == EDID_MONITOR_DESCRIPTOR_NAME) 218 printf("Monitor name: %s\n", 219 snip(monitor->data.string)); 220 else if (monitor->type == EDID_MONITOR_DESCRIPTOR_RANGE) 221 printf("Monitor range limits, horizontal sync: " 222 "%d-%d kHz, vertical refresh: " 223 "%d-%d Hz, max pixel clock: " 224 "%d MHz\n", 225 monitor->data.range_data.horizontal_min, 226 monitor->data.range_data.horizontal_max, 227 monitor->data.range_data.vertical_min, 228 monitor->data.range_data.vertical_max, 229 monitor->data.range_data.pixel_clock_max * 10); 230 } else { 231 uint32_t pixclock, h_active, h_blanking, v_active, v_blanking; 232 uint32_t h_total, v_total, vfreq; 233 234 pixclock = EDID_DETAILED_TIMING_PIXEL_CLOCK(*timing); 235 h_active = EDID_DETAILED_TIMING_HORIZONTAL_ACTIVE(*timing); 236 h_blanking = EDID_DETAILED_TIMING_HORIZONTAL_BLANKING(*timing); 237 v_active = EDID_DETAILED_TIMING_VERTICAL_ACTIVE(*timing); 238 v_blanking = EDID_DETAILED_TIMING_VERTICAL_BLANKING(*timing); 239 240 h_total = h_active + h_blanking; 241 v_total = v_active + v_blanking; 242 if (v_total * h_total) 243 vfreq = pixclock / (v_total * h_total); 244 else 245 vfreq = 1; /* Error case */ 246 printf("\t%dx%d\%c\t%d Hz (detailed)\n", h_active, 247 v_active, h_active > 1000 ? ' ' : '\t', vfreq); 248 *have_timing = 1; 249 } 250 } 251 252 /** 253 * Get the manufacturer name from an EDID info. 254 * 255 * @param edid_info The EDID info to be printed 256 * @param name Returns the string of the manufacturer name 257 */ 258 static void edid_get_manufacturer_name(struct edid1_info *edid, char *name) 259 { 260 name[0] = EDID1_INFO_MANUFACTURER_NAME_CHAR1(*edid) + 'A' - 1; 261 name[1] = EDID1_INFO_MANUFACTURER_NAME_CHAR2(*edid) + 'A' - 1; 262 name[2] = EDID1_INFO_MANUFACTURER_NAME_CHAR3(*edid) + 'A' - 1; 263 name[3] = '\0'; 264 } 265 266 void edid_print_info(struct edid1_info *edid_info) 267 { 268 int i; 269 char manufacturer[4]; 270 unsigned int have_timing = 0; 271 uint32_t serial_number; 272 273 if (edid_check_info(edid_info)) { 274 printf("Not a valid EDID\n"); 275 return; 276 } 277 278 printf("EDID version: %d.%d\n", 279 edid_info->version, edid_info->revision); 280 281 printf("Product ID code: %04x\n", EDID1_INFO_PRODUCT_CODE(*edid_info)); 282 283 edid_get_manufacturer_name(edid_info, manufacturer); 284 printf("Manufacturer: %s\n", manufacturer); 285 286 serial_number = EDID1_INFO_SERIAL_NUMBER(*edid_info); 287 if (serial_number != 0xffffffff) { 288 if (strcmp(manufacturer, "MAG") == 0) 289 serial_number -= 0x7000000; 290 if (strcmp(manufacturer, "OQI") == 0) 291 serial_number -= 456150000; 292 if (strcmp(manufacturer, "VSC") == 0) 293 serial_number -= 640000000; 294 } 295 printf("Serial number: %08x\n", serial_number); 296 printf("Manufactured in week: %d year: %d\n", 297 edid_info->week, edid_info->year + 1990); 298 299 printf("Video input definition: %svoltage level %d%s%s%s%s%s\n", 300 EDID1_INFO_VIDEO_INPUT_DIGITAL(*edid_info) ? 301 "digital signal, " : "analog signal, ", 302 EDID1_INFO_VIDEO_INPUT_VOLTAGE_LEVEL(*edid_info), 303 EDID1_INFO_VIDEO_INPUT_BLANK_TO_BLACK(*edid_info) ? 304 ", blank to black" : "", 305 EDID1_INFO_VIDEO_INPUT_SEPARATE_SYNC(*edid_info) ? 306 ", separate sync" : "", 307 EDID1_INFO_VIDEO_INPUT_COMPOSITE_SYNC(*edid_info) ? 308 ", composite sync" : "", 309 EDID1_INFO_VIDEO_INPUT_SYNC_ON_GREEN(*edid_info) ? 310 ", sync on green" : "", 311 EDID1_INFO_VIDEO_INPUT_SERRATION_V(*edid_info) ? 312 ", serration v" : ""); 313 314 printf("Monitor is %s\n", 315 EDID1_INFO_FEATURE_RGB(*edid_info) ? "RGB" : "non-RGB"); 316 317 printf("Maximum visible display size: %d cm x %d cm\n", 318 edid_info->max_size_horizontal, 319 edid_info->max_size_vertical); 320 321 printf("Power management features: %s%s, %s%s, %s%s\n", 322 EDID1_INFO_FEATURE_ACTIVE_OFF(*edid_info) ? 323 "" : "no ", "active off", 324 EDID1_INFO_FEATURE_SUSPEND(*edid_info) ? "" : "no ", "suspend", 325 EDID1_INFO_FEATURE_STANDBY(*edid_info) ? "" : "no ", "standby"); 326 327 printf("Estabilished timings:\n"); 328 if (EDID1_INFO_ESTABLISHED_TIMING_720X400_70(*edid_info)) 329 printf("\t720x400\t\t70 Hz (VGA 640x400, IBM)\n"); 330 if (EDID1_INFO_ESTABLISHED_TIMING_720X400_88(*edid_info)) 331 printf("\t720x400\t\t88 Hz (XGA2)\n"); 332 if (EDID1_INFO_ESTABLISHED_TIMING_640X480_60(*edid_info)) 333 printf("\t640x480\t\t60 Hz (VGA)\n"); 334 if (EDID1_INFO_ESTABLISHED_TIMING_640X480_67(*edid_info)) 335 printf("\t640x480\t\t67 Hz (Mac II, Apple)\n"); 336 if (EDID1_INFO_ESTABLISHED_TIMING_640X480_72(*edid_info)) 337 printf("\t640x480\t\t72 Hz (VESA)\n"); 338 if (EDID1_INFO_ESTABLISHED_TIMING_640X480_75(*edid_info)) 339 printf("\t640x480\t\t75 Hz (VESA)\n"); 340 if (EDID1_INFO_ESTABLISHED_TIMING_800X600_56(*edid_info)) 341 printf("\t800x600\t\t56 Hz (VESA)\n"); 342 if (EDID1_INFO_ESTABLISHED_TIMING_800X600_60(*edid_info)) 343 printf("\t800x600\t\t60 Hz (VESA)\n"); 344 if (EDID1_INFO_ESTABLISHED_TIMING_800X600_72(*edid_info)) 345 printf("\t800x600\t\t72 Hz (VESA)\n"); 346 if (EDID1_INFO_ESTABLISHED_TIMING_800X600_75(*edid_info)) 347 printf("\t800x600\t\t75 Hz (VESA)\n"); 348 if (EDID1_INFO_ESTABLISHED_TIMING_832X624_75(*edid_info)) 349 printf("\t832x624\t\t75 Hz (Mac II)\n"); 350 if (EDID1_INFO_ESTABLISHED_TIMING_1024X768_87I(*edid_info)) 351 printf("\t1024x768\t87 Hz Interlaced (8514A)\n"); 352 if (EDID1_INFO_ESTABLISHED_TIMING_1024X768_60(*edid_info)) 353 printf("\t1024x768\t60 Hz (VESA)\n"); 354 if (EDID1_INFO_ESTABLISHED_TIMING_1024X768_70(*edid_info)) 355 printf("\t1024x768\t70 Hz (VESA)\n"); 356 if (EDID1_INFO_ESTABLISHED_TIMING_1024X768_75(*edid_info)) 357 printf("\t1024x768\t75 Hz (VESA)\n"); 358 if (EDID1_INFO_ESTABLISHED_TIMING_1280X1024_75(*edid_info)) 359 printf("\t1280x1024\t75 (VESA)\n"); 360 if (EDID1_INFO_ESTABLISHED_TIMING_1152X870_75(*edid_info)) 361 printf("\t1152x870\t75 (Mac II)\n"); 362 363 /* Standard timings. */ 364 printf("Standard timings:\n"); 365 for (i = 0; i < ARRAY_SIZE(edid_info->standard_timings); i++) { 366 unsigned int aspect = 10000; 367 unsigned int x, y; 368 unsigned char xres, vfreq; 369 370 xres = EDID1_INFO_STANDARD_TIMING_XRESOLUTION(*edid_info, i); 371 vfreq = EDID1_INFO_STANDARD_TIMING_VFREQ(*edid_info, i); 372 if ((xres != vfreq) || 373 ((xres != 0) && (xres != 1)) || 374 ((vfreq != 0) && (vfreq != 1))) { 375 switch (EDID1_INFO_STANDARD_TIMING_ASPECT(*edid_info, 376 i)) { 377 case ASPECT_625: 378 aspect = 6250; 379 break; 380 case ASPECT_75: 381 aspect = 7500; 382 break; 383 case ASPECT_8: 384 aspect = 8000; 385 break; 386 case ASPECT_5625: 387 aspect = 5625; 388 break; 389 } 390 x = (xres + 31) * 8; 391 y = x * aspect / 10000; 392 printf("\t%dx%d%c\t%d Hz\n", x, y, 393 x > 1000 ? ' ' : '\t', (vfreq & 0x3f) + 60); 394 have_timing = 1; 395 } 396 } 397 398 /* Detailed timing information. */ 399 for (i = 0; i < ARRAY_SIZE(edid_info->monitor_details.descriptor); 400 i++) { 401 edid_print_dtd(&edid_info->monitor_details.descriptor[i], 402 &have_timing); 403 } 404 405 if (!have_timing) 406 printf("\tNone\n"); 407 } 408