edid.c 9.1 KB

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  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. #include <common.h>
  13. #include <edid.h>
  14. #include <linux/ctype.h>
  15. #include <linux/string.h>
  16. int edid_check_info(struct edid1_info *edid_info)
  17. {
  18. if ((edid_info == NULL) || (edid_info->version == 0))
  19. return -1;
  20. if (memcmp(edid_info->header, "\x0\xff\xff\xff\xff\xff\xff\x0", 8))
  21. return -1;
  22. if (edid_info->version == 0xff && edid_info->revision == 0xff)
  23. return -1;
  24. return 0;
  25. }
  26. int edid_get_ranges(struct edid1_info *edid, unsigned int *hmin,
  27. unsigned int *hmax, unsigned int *vmin,
  28. unsigned int *vmax)
  29. {
  30. int i;
  31. struct edid_monitor_descriptor *monitor;
  32. *hmin = *hmax = *vmin = *vmax = 0;
  33. if (edid_check_info(edid))
  34. return -1;
  35. for (i = 0; i < ARRAY_SIZE(edid->monitor_details.descriptor); i++) {
  36. monitor = &edid->monitor_details.descriptor[i];
  37. if (monitor->type == EDID_MONITOR_DESCRIPTOR_RANGE) {
  38. *hmin = monitor->data.range_data.horizontal_min;
  39. *hmax = monitor->data.range_data.horizontal_max;
  40. *vmin = monitor->data.range_data.vertical_min;
  41. *vmax = monitor->data.range_data.vertical_max;
  42. return 0;
  43. }
  44. }
  45. return -1;
  46. }
  47. /**
  48. * Snip the tailing whitespace/return of a string.
  49. *
  50. * @param string The string to be snipped
  51. * @return the snipped string
  52. */
  53. static char *snip(char *string)
  54. {
  55. char *s;
  56. /*
  57. * This is always a 13 character buffer
  58. * and it's not always terminated.
  59. */
  60. string[12] = '\0';
  61. s = &string[strlen(string) - 1];
  62. while (s >= string && (isspace(*s) || *s == '\n' || *s == '\r' ||
  63. *s == '\0'))
  64. *(s--) = '\0';
  65. return string;
  66. }
  67. /**
  68. * Print an EDID monitor descriptor block
  69. *
  70. * @param monitor The EDID monitor descriptor block
  71. * @have_timing Modifies to 1 if the desciptor contains timing info
  72. */
  73. static void edid_print_dtd(struct edid_monitor_descriptor *monitor,
  74. unsigned int *have_timing)
  75. {
  76. unsigned char *bytes = (unsigned char *)monitor;
  77. struct edid_detailed_timing *timing =
  78. (struct edid_detailed_timing *)monitor;
  79. if (bytes[0] == 0 && bytes[1] == 0) {
  80. if (monitor->type == EDID_MONITOR_DESCRIPTOR_SERIAL)
  81. printf("Monitor serial number: %s\n",
  82. snip(monitor->data.string));
  83. else if (monitor->type == EDID_MONITOR_DESCRIPTOR_ASCII)
  84. printf("Monitor ID: %s\n",
  85. snip(monitor->data.string));
  86. else if (monitor->type == EDID_MONITOR_DESCRIPTOR_NAME)
  87. printf("Monitor name: %s\n",
  88. snip(monitor->data.string));
  89. else if (monitor->type == EDID_MONITOR_DESCRIPTOR_RANGE)
  90. printf("Monitor range limits, horizontal sync: "
  91. "%d-%d kHz, vertical refresh: "
  92. "%d-%d Hz, max pixel clock: "
  93. "%d MHz\n",
  94. monitor->data.range_data.horizontal_min,
  95. monitor->data.range_data.horizontal_max,
  96. monitor->data.range_data.vertical_min,
  97. monitor->data.range_data.vertical_max,
  98. monitor->data.range_data.pixel_clock_max * 10);
  99. } else {
  100. uint32_t pixclock, h_active, h_blanking, v_active, v_blanking;
  101. uint32_t h_total, v_total, vfreq;
  102. pixclock = EDID_DETAILED_TIMING_PIXEL_CLOCK(*timing);
  103. h_active = EDID_DETAILED_TIMING_HORIZONTAL_ACTIVE(*timing);
  104. h_blanking = EDID_DETAILED_TIMING_HORIZONTAL_BLANKING(*timing);
  105. v_active = EDID_DETAILED_TIMING_VERTICAL_ACTIVE(*timing);
  106. v_blanking = EDID_DETAILED_TIMING_VERTICAL_BLANKING(*timing);
  107. h_total = h_active + h_blanking;
  108. v_total = v_active + v_blanking;
  109. if (v_total * h_total)
  110. vfreq = pixclock / (v_total * h_total);
  111. else
  112. vfreq = 1; /* Error case */
  113. printf("\t%dx%d\%c\t%d Hz (detailed)\n", h_active,
  114. v_active, h_active > 1000 ? ' ' : '\t', vfreq);
  115. *have_timing = 1;
  116. }
  117. }
  118. /**
  119. * Get the manufacturer name from an EDID info.
  120. *
  121. * @param edid_info The EDID info to be printed
  122. * @param name Returns the string of the manufacturer name
  123. */
  124. static void edid_get_manufacturer_name(struct edid1_info *edid, char *name)
  125. {
  126. name[0] = EDID1_INFO_MANUFACTURER_NAME_CHAR1(*edid) + 'A' - 1;
  127. name[1] = EDID1_INFO_MANUFACTURER_NAME_CHAR2(*edid) + 'A' - 1;
  128. name[2] = EDID1_INFO_MANUFACTURER_NAME_CHAR3(*edid) + 'A' - 1;
  129. name[3] = '\0';
  130. }
  131. void edid_print_info(struct edid1_info *edid_info)
  132. {
  133. int i;
  134. char manufacturer[4];
  135. unsigned int have_timing = 0;
  136. uint32_t serial_number;
  137. if (edid_check_info(edid_info)) {
  138. printf("Not a valid EDID\n");
  139. return;
  140. }
  141. printf("EDID version: %d.%d\n",
  142. edid_info->version, edid_info->revision);
  143. printf("Product ID code: %04x\n", EDID1_INFO_PRODUCT_CODE(*edid_info));
  144. edid_get_manufacturer_name(edid_info, manufacturer);
  145. printf("Manufacturer: %s\n", manufacturer);
  146. serial_number = EDID1_INFO_SERIAL_NUMBER(*edid_info);
  147. if (serial_number != 0xffffffff) {
  148. if (strcmp(manufacturer, "MAG") == 0)
  149. serial_number -= 0x7000000;
  150. if (strcmp(manufacturer, "OQI") == 0)
  151. serial_number -= 456150000;
  152. if (strcmp(manufacturer, "VSC") == 0)
  153. serial_number -= 640000000;
  154. }
  155. printf("Serial number: %08x\n", serial_number);
  156. printf("Manufactured in week: %d year: %d\n",
  157. edid_info->week, edid_info->year + 1990);
  158. printf("Video input definition: %svoltage level %d%s%s%s%s%s\n",
  159. EDID1_INFO_VIDEO_INPUT_DIGITAL(*edid_info) ?
  160. "digital signal, " : "analog signal, ",
  161. EDID1_INFO_VIDEO_INPUT_VOLTAGE_LEVEL(*edid_info),
  162. EDID1_INFO_VIDEO_INPUT_BLANK_TO_BLACK(*edid_info) ?
  163. ", blank to black" : "",
  164. EDID1_INFO_VIDEO_INPUT_SEPARATE_SYNC(*edid_info) ?
  165. ", separate sync" : "",
  166. EDID1_INFO_VIDEO_INPUT_COMPOSITE_SYNC(*edid_info) ?
  167. ", composite sync" : "",
  168. EDID1_INFO_VIDEO_INPUT_SYNC_ON_GREEN(*edid_info) ?
  169. ", sync on green" : "",
  170. EDID1_INFO_VIDEO_INPUT_SERRATION_V(*edid_info) ?
  171. ", serration v" : "");
  172. printf("Monitor is %s\n",
  173. EDID1_INFO_FEATURE_RGB(*edid_info) ? "RGB" : "non-RGB");
  174. printf("Maximum visible display size: %d cm x %d cm\n",
  175. edid_info->max_size_horizontal,
  176. edid_info->max_size_vertical);
  177. printf("Power management features: %s%s, %s%s, %s%s\n",
  178. EDID1_INFO_FEATURE_ACTIVE_OFF(*edid_info) ?
  179. "" : "no ", "active off",
  180. EDID1_INFO_FEATURE_SUSPEND(*edid_info) ? "" : "no ", "suspend",
  181. EDID1_INFO_FEATURE_STANDBY(*edid_info) ? "" : "no ", "standby");
  182. printf("Estabilished timings:\n");
  183. if (EDID1_INFO_ESTABLISHED_TIMING_720X400_70(*edid_info))
  184. printf("\t720x400\t\t70 Hz (VGA 640x400, IBM)\n");
  185. if (EDID1_INFO_ESTABLISHED_TIMING_720X400_88(*edid_info))
  186. printf("\t720x400\t\t88 Hz (XGA2)\n");
  187. if (EDID1_INFO_ESTABLISHED_TIMING_640X480_60(*edid_info))
  188. printf("\t640x480\t\t60 Hz (VGA)\n");
  189. if (EDID1_INFO_ESTABLISHED_TIMING_640X480_67(*edid_info))
  190. printf("\t640x480\t\t67 Hz (Mac II, Apple)\n");
  191. if (EDID1_INFO_ESTABLISHED_TIMING_640X480_72(*edid_info))
  192. printf("\t640x480\t\t72 Hz (VESA)\n");
  193. if (EDID1_INFO_ESTABLISHED_TIMING_640X480_75(*edid_info))
  194. printf("\t640x480\t\t75 Hz (VESA)\n");
  195. if (EDID1_INFO_ESTABLISHED_TIMING_800X600_56(*edid_info))
  196. printf("\t800x600\t\t56 Hz (VESA)\n");
  197. if (EDID1_INFO_ESTABLISHED_TIMING_800X600_60(*edid_info))
  198. printf("\t800x600\t\t60 Hz (VESA)\n");
  199. if (EDID1_INFO_ESTABLISHED_TIMING_800X600_72(*edid_info))
  200. printf("\t800x600\t\t72 Hz (VESA)\n");
  201. if (EDID1_INFO_ESTABLISHED_TIMING_800X600_75(*edid_info))
  202. printf("\t800x600\t\t75 Hz (VESA)\n");
  203. if (EDID1_INFO_ESTABLISHED_TIMING_832X624_75(*edid_info))
  204. printf("\t832x624\t\t75 Hz (Mac II)\n");
  205. if (EDID1_INFO_ESTABLISHED_TIMING_1024X768_87I(*edid_info))
  206. printf("\t1024x768\t87 Hz Interlaced (8514A)\n");
  207. if (EDID1_INFO_ESTABLISHED_TIMING_1024X768_60(*edid_info))
  208. printf("\t1024x768\t60 Hz (VESA)\n");
  209. if (EDID1_INFO_ESTABLISHED_TIMING_1024X768_70(*edid_info))
  210. printf("\t1024x768\t70 Hz (VESA)\n");
  211. if (EDID1_INFO_ESTABLISHED_TIMING_1024X768_75(*edid_info))
  212. printf("\t1024x768\t75 Hz (VESA)\n");
  213. if (EDID1_INFO_ESTABLISHED_TIMING_1280X1024_75(*edid_info))
  214. printf("\t1280x1024\t75 (VESA)\n");
  215. if (EDID1_INFO_ESTABLISHED_TIMING_1152X870_75(*edid_info))
  216. printf("\t1152x870\t75 (Mac II)\n");
  217. /* Standard timings. */
  218. printf("Standard timings:\n");
  219. for (i = 0; i < ARRAY_SIZE(edid_info->standard_timings); i++) {
  220. unsigned int aspect = 10000;
  221. unsigned int x, y;
  222. unsigned char xres, vfreq;
  223. xres = EDID1_INFO_STANDARD_TIMING_XRESOLUTION(*edid_info, i);
  224. vfreq = EDID1_INFO_STANDARD_TIMING_VFREQ(*edid_info, i);
  225. if ((xres != vfreq) ||
  226. ((xres != 0) && (xres != 1)) ||
  227. ((vfreq != 0) && (vfreq != 1))) {
  228. switch (EDID1_INFO_STANDARD_TIMING_ASPECT(*edid_info,
  229. i)) {
  230. case ASPECT_625:
  231. aspect = 6250;
  232. break;
  233. case ASPECT_75:
  234. aspect = 7500;
  235. break;
  236. case ASPECT_8:
  237. aspect = 8000;
  238. break;
  239. case ASPECT_5625:
  240. aspect = 5625;
  241. break;
  242. }
  243. x = (xres + 31) * 8;
  244. y = x * aspect / 10000;
  245. printf("\t%dx%d%c\t%d Hz\n", x, y,
  246. x > 1000 ? ' ' : '\t', (vfreq & 0x3f) + 60);
  247. have_timing = 1;
  248. }
  249. }
  250. /* Detailed timing information. */
  251. for (i = 0; i < ARRAY_SIZE(edid_info->monitor_details.descriptor);
  252. i++) {
  253. edid_print_dtd(&edid_info->monitor_details.descriptor[i],
  254. &have_timing);
  255. }
  256. if (!have_timing)
  257. printf("\tNone\n");
  258. }