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 <linux/ctype.h> 17 #include <linux/string.h> 18 19 int edid_check_info(struct edid1_info *edid_info) 20 { 21 if ((edid_info == NULL) || (edid_info->version == 0)) 22 return -1; 23 24 if (memcmp(edid_info->header, "\x0\xff\xff\xff\xff\xff\xff\x0", 8)) 25 return -1; 26 27 if (edid_info->version == 0xff && edid_info->revision == 0xff) 28 return -1; 29 30 return 0; 31 } 32 33 int edid_check_checksum(u8 *edid_block) 34 { 35 u8 checksum = 0; 36 int i; 37 38 for (i = 0; i < 128; i++) 39 checksum += edid_block[i]; 40 41 return (checksum == 0) ? 0 : -EINVAL; 42 } 43 44 int edid_get_ranges(struct edid1_info *edid, unsigned int *hmin, 45 unsigned int *hmax, unsigned int *vmin, 46 unsigned int *vmax) 47 { 48 int i; 49 struct edid_monitor_descriptor *monitor; 50 51 *hmin = *hmax = *vmin = *vmax = 0; 52 if (edid_check_info(edid)) 53 return -1; 54 55 for (i = 0; i < ARRAY_SIZE(edid->monitor_details.descriptor); i++) { 56 monitor = &edid->monitor_details.descriptor[i]; 57 if (monitor->type == EDID_MONITOR_DESCRIPTOR_RANGE) { 58 *hmin = monitor->data.range_data.horizontal_min; 59 *hmax = monitor->data.range_data.horizontal_max; 60 *vmin = monitor->data.range_data.vertical_min; 61 *vmax = monitor->data.range_data.vertical_max; 62 return 0; 63 } 64 } 65 return -1; 66 } 67 68 /** 69 * Snip the tailing whitespace/return of a string. 70 * 71 * @param string The string to be snipped 72 * @return the snipped string 73 */ 74 static char *snip(char *string) 75 { 76 char *s; 77 78 /* 79 * This is always a 13 character buffer 80 * and it's not always terminated. 81 */ 82 string[12] = '\0'; 83 s = &string[strlen(string) - 1]; 84 85 while (s >= string && (isspace(*s) || *s == '\n' || *s == '\r' || 86 *s == '\0')) 87 *(s--) = '\0'; 88 89 return string; 90 } 91 92 /** 93 * Print an EDID monitor descriptor block 94 * 95 * @param monitor The EDID monitor descriptor block 96 * @have_timing Modifies to 1 if the desciptor contains timing info 97 */ 98 static void edid_print_dtd(struct edid_monitor_descriptor *monitor, 99 unsigned int *have_timing) 100 { 101 unsigned char *bytes = (unsigned char *)monitor; 102 struct edid_detailed_timing *timing = 103 (struct edid_detailed_timing *)monitor; 104 105 if (bytes[0] == 0 && bytes[1] == 0) { 106 if (monitor->type == EDID_MONITOR_DESCRIPTOR_SERIAL) 107 printf("Monitor serial number: %s\n", 108 snip(monitor->data.string)); 109 else if (monitor->type == EDID_MONITOR_DESCRIPTOR_ASCII) 110 printf("Monitor ID: %s\n", 111 snip(monitor->data.string)); 112 else if (monitor->type == EDID_MONITOR_DESCRIPTOR_NAME) 113 printf("Monitor name: %s\n", 114 snip(monitor->data.string)); 115 else if (monitor->type == EDID_MONITOR_DESCRIPTOR_RANGE) 116 printf("Monitor range limits, horizontal sync: " 117 "%d-%d kHz, vertical refresh: " 118 "%d-%d Hz, max pixel clock: " 119 "%d MHz\n", 120 monitor->data.range_data.horizontal_min, 121 monitor->data.range_data.horizontal_max, 122 monitor->data.range_data.vertical_min, 123 monitor->data.range_data.vertical_max, 124 monitor->data.range_data.pixel_clock_max * 10); 125 } else { 126 uint32_t pixclock, h_active, h_blanking, v_active, v_blanking; 127 uint32_t h_total, v_total, vfreq; 128 129 pixclock = EDID_DETAILED_TIMING_PIXEL_CLOCK(*timing); 130 h_active = EDID_DETAILED_TIMING_HORIZONTAL_ACTIVE(*timing); 131 h_blanking = EDID_DETAILED_TIMING_HORIZONTAL_BLANKING(*timing); 132 v_active = EDID_DETAILED_TIMING_VERTICAL_ACTIVE(*timing); 133 v_blanking = EDID_DETAILED_TIMING_VERTICAL_BLANKING(*timing); 134 135 h_total = h_active + h_blanking; 136 v_total = v_active + v_blanking; 137 if (v_total * h_total) 138 vfreq = pixclock / (v_total * h_total); 139 else 140 vfreq = 1; /* Error case */ 141 printf("\t%dx%d\%c\t%d Hz (detailed)\n", h_active, 142 v_active, h_active > 1000 ? ' ' : '\t', vfreq); 143 *have_timing = 1; 144 } 145 } 146 147 /** 148 * Get the manufacturer name from an EDID info. 149 * 150 * @param edid_info The EDID info to be printed 151 * @param name Returns the string of the manufacturer name 152 */ 153 static void edid_get_manufacturer_name(struct edid1_info *edid, char *name) 154 { 155 name[0] = EDID1_INFO_MANUFACTURER_NAME_CHAR1(*edid) + 'A' - 1; 156 name[1] = EDID1_INFO_MANUFACTURER_NAME_CHAR2(*edid) + 'A' - 1; 157 name[2] = EDID1_INFO_MANUFACTURER_NAME_CHAR3(*edid) + 'A' - 1; 158 name[3] = '\0'; 159 } 160 161 void edid_print_info(struct edid1_info *edid_info) 162 { 163 int i; 164 char manufacturer[4]; 165 unsigned int have_timing = 0; 166 uint32_t serial_number; 167 168 if (edid_check_info(edid_info)) { 169 printf("Not a valid EDID\n"); 170 return; 171 } 172 173 printf("EDID version: %d.%d\n", 174 edid_info->version, edid_info->revision); 175 176 printf("Product ID code: %04x\n", EDID1_INFO_PRODUCT_CODE(*edid_info)); 177 178 edid_get_manufacturer_name(edid_info, manufacturer); 179 printf("Manufacturer: %s\n", manufacturer); 180 181 serial_number = EDID1_INFO_SERIAL_NUMBER(*edid_info); 182 if (serial_number != 0xffffffff) { 183 if (strcmp(manufacturer, "MAG") == 0) 184 serial_number -= 0x7000000; 185 if (strcmp(manufacturer, "OQI") == 0) 186 serial_number -= 456150000; 187 if (strcmp(manufacturer, "VSC") == 0) 188 serial_number -= 640000000; 189 } 190 printf("Serial number: %08x\n", serial_number); 191 printf("Manufactured in week: %d year: %d\n", 192 edid_info->week, edid_info->year + 1990); 193 194 printf("Video input definition: %svoltage level %d%s%s%s%s%s\n", 195 EDID1_INFO_VIDEO_INPUT_DIGITAL(*edid_info) ? 196 "digital signal, " : "analog signal, ", 197 EDID1_INFO_VIDEO_INPUT_VOLTAGE_LEVEL(*edid_info), 198 EDID1_INFO_VIDEO_INPUT_BLANK_TO_BLACK(*edid_info) ? 199 ", blank to black" : "", 200 EDID1_INFO_VIDEO_INPUT_SEPARATE_SYNC(*edid_info) ? 201 ", separate sync" : "", 202 EDID1_INFO_VIDEO_INPUT_COMPOSITE_SYNC(*edid_info) ? 203 ", composite sync" : "", 204 EDID1_INFO_VIDEO_INPUT_SYNC_ON_GREEN(*edid_info) ? 205 ", sync on green" : "", 206 EDID1_INFO_VIDEO_INPUT_SERRATION_V(*edid_info) ? 207 ", serration v" : ""); 208 209 printf("Monitor is %s\n", 210 EDID1_INFO_FEATURE_RGB(*edid_info) ? "RGB" : "non-RGB"); 211 212 printf("Maximum visible display size: %d cm x %d cm\n", 213 edid_info->max_size_horizontal, 214 edid_info->max_size_vertical); 215 216 printf("Power management features: %s%s, %s%s, %s%s\n", 217 EDID1_INFO_FEATURE_ACTIVE_OFF(*edid_info) ? 218 "" : "no ", "active off", 219 EDID1_INFO_FEATURE_SUSPEND(*edid_info) ? "" : "no ", "suspend", 220 EDID1_INFO_FEATURE_STANDBY(*edid_info) ? "" : "no ", "standby"); 221 222 printf("Estabilished timings:\n"); 223 if (EDID1_INFO_ESTABLISHED_TIMING_720X400_70(*edid_info)) 224 printf("\t720x400\t\t70 Hz (VGA 640x400, IBM)\n"); 225 if (EDID1_INFO_ESTABLISHED_TIMING_720X400_88(*edid_info)) 226 printf("\t720x400\t\t88 Hz (XGA2)\n"); 227 if (EDID1_INFO_ESTABLISHED_TIMING_640X480_60(*edid_info)) 228 printf("\t640x480\t\t60 Hz (VGA)\n"); 229 if (EDID1_INFO_ESTABLISHED_TIMING_640X480_67(*edid_info)) 230 printf("\t640x480\t\t67 Hz (Mac II, Apple)\n"); 231 if (EDID1_INFO_ESTABLISHED_TIMING_640X480_72(*edid_info)) 232 printf("\t640x480\t\t72 Hz (VESA)\n"); 233 if (EDID1_INFO_ESTABLISHED_TIMING_640X480_75(*edid_info)) 234 printf("\t640x480\t\t75 Hz (VESA)\n"); 235 if (EDID1_INFO_ESTABLISHED_TIMING_800X600_56(*edid_info)) 236 printf("\t800x600\t\t56 Hz (VESA)\n"); 237 if (EDID1_INFO_ESTABLISHED_TIMING_800X600_60(*edid_info)) 238 printf("\t800x600\t\t60 Hz (VESA)\n"); 239 if (EDID1_INFO_ESTABLISHED_TIMING_800X600_72(*edid_info)) 240 printf("\t800x600\t\t72 Hz (VESA)\n"); 241 if (EDID1_INFO_ESTABLISHED_TIMING_800X600_75(*edid_info)) 242 printf("\t800x600\t\t75 Hz (VESA)\n"); 243 if (EDID1_INFO_ESTABLISHED_TIMING_832X624_75(*edid_info)) 244 printf("\t832x624\t\t75 Hz (Mac II)\n"); 245 if (EDID1_INFO_ESTABLISHED_TIMING_1024X768_87I(*edid_info)) 246 printf("\t1024x768\t87 Hz Interlaced (8514A)\n"); 247 if (EDID1_INFO_ESTABLISHED_TIMING_1024X768_60(*edid_info)) 248 printf("\t1024x768\t60 Hz (VESA)\n"); 249 if (EDID1_INFO_ESTABLISHED_TIMING_1024X768_70(*edid_info)) 250 printf("\t1024x768\t70 Hz (VESA)\n"); 251 if (EDID1_INFO_ESTABLISHED_TIMING_1024X768_75(*edid_info)) 252 printf("\t1024x768\t75 Hz (VESA)\n"); 253 if (EDID1_INFO_ESTABLISHED_TIMING_1280X1024_75(*edid_info)) 254 printf("\t1280x1024\t75 (VESA)\n"); 255 if (EDID1_INFO_ESTABLISHED_TIMING_1152X870_75(*edid_info)) 256 printf("\t1152x870\t75 (Mac II)\n"); 257 258 /* Standard timings. */ 259 printf("Standard timings:\n"); 260 for (i = 0; i < ARRAY_SIZE(edid_info->standard_timings); i++) { 261 unsigned int aspect = 10000; 262 unsigned int x, y; 263 unsigned char xres, vfreq; 264 265 xres = EDID1_INFO_STANDARD_TIMING_XRESOLUTION(*edid_info, i); 266 vfreq = EDID1_INFO_STANDARD_TIMING_VFREQ(*edid_info, i); 267 if ((xres != vfreq) || 268 ((xres != 0) && (xres != 1)) || 269 ((vfreq != 0) && (vfreq != 1))) { 270 switch (EDID1_INFO_STANDARD_TIMING_ASPECT(*edid_info, 271 i)) { 272 case ASPECT_625: 273 aspect = 6250; 274 break; 275 case ASPECT_75: 276 aspect = 7500; 277 break; 278 case ASPECT_8: 279 aspect = 8000; 280 break; 281 case ASPECT_5625: 282 aspect = 5625; 283 break; 284 } 285 x = (xres + 31) * 8; 286 y = x * aspect / 10000; 287 printf("\t%dx%d%c\t%d Hz\n", x, y, 288 x > 1000 ? ' ' : '\t', (vfreq & 0x3f) + 60); 289 have_timing = 1; 290 } 291 } 292 293 /* Detailed timing information. */ 294 for (i = 0; i < ARRAY_SIZE(edid_info->monitor_details.descriptor); 295 i++) { 296 edid_print_dtd(&edid_info->monitor_details.descriptor[i], 297 &have_timing); 298 } 299 300 if (!have_timing) 301 printf("\tNone\n"); 302 } 303