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 <linux/ctype.h> 16 #include <linux/string.h> 17 18 int edid_check_info(struct edid1_info *edid_info) 19 { 20 if ((edid_info == NULL) || (edid_info->version == 0)) 21 return -1; 22 23 if (memcmp(edid_info->header, "\x0\xff\xff\xff\xff\xff\xff\x0", 8)) 24 return -1; 25 26 if (edid_info->version == 0xff && edid_info->revision == 0xff) 27 return -1; 28 29 return 0; 30 } 31 32 int edid_get_ranges(struct edid1_info *edid, unsigned int *hmin, 33 unsigned int *hmax, unsigned int *vmin, 34 unsigned int *vmax) 35 { 36 int i; 37 struct edid_monitor_descriptor *monitor; 38 39 *hmin = *hmax = *vmin = *vmax = 0; 40 if (edid_check_info(edid)) 41 return -1; 42 43 for (i = 0; i < ARRAY_SIZE(edid->monitor_details.descriptor); i++) { 44 monitor = &edid->monitor_details.descriptor[i]; 45 if (monitor->type == EDID_MONITOR_DESCRIPTOR_RANGE) { 46 *hmin = monitor->data.range_data.horizontal_min; 47 *hmax = monitor->data.range_data.horizontal_max; 48 *vmin = monitor->data.range_data.vertical_min; 49 *vmax = monitor->data.range_data.vertical_max; 50 return 0; 51 } 52 } 53 return -1; 54 } 55 56 /** 57 * Snip the tailing whitespace/return of a string. 58 * 59 * @param string The string to be snipped 60 * @return the snipped string 61 */ 62 static char *snip(char *string) 63 { 64 char *s; 65 66 /* 67 * This is always a 13 character buffer 68 * and it's not always terminated. 69 */ 70 string[12] = '\0'; 71 s = &string[strlen(string) - 1]; 72 73 while (s >= string && (isspace(*s) || *s == '\n' || *s == '\r' || 74 *s == '\0')) 75 *(s--) = '\0'; 76 77 return string; 78 } 79 80 /** 81 * Print an EDID monitor descriptor block 82 * 83 * @param monitor The EDID monitor descriptor block 84 * @have_timing Modifies to 1 if the desciptor contains timing info 85 */ 86 static void edid_print_dtd(struct edid_monitor_descriptor *monitor, 87 unsigned int *have_timing) 88 { 89 unsigned char *bytes = (unsigned char *)monitor; 90 struct edid_detailed_timing *timing = 91 (struct edid_detailed_timing *)monitor; 92 93 if (bytes[0] == 0 && bytes[1] == 0) { 94 if (monitor->type == EDID_MONITOR_DESCRIPTOR_SERIAL) 95 printf("Monitor serial number: %s\n", 96 snip(monitor->data.string)); 97 else if (monitor->type == EDID_MONITOR_DESCRIPTOR_ASCII) 98 printf("Monitor ID: %s\n", 99 snip(monitor->data.string)); 100 else if (monitor->type == EDID_MONITOR_DESCRIPTOR_NAME) 101 printf("Monitor name: %s\n", 102 snip(monitor->data.string)); 103 else if (monitor->type == EDID_MONITOR_DESCRIPTOR_RANGE) 104 printf("Monitor range limits, horizontal sync: " 105 "%d-%d kHz, vertical refresh: " 106 "%d-%d Hz, max pixel clock: " 107 "%d MHz\n", 108 monitor->data.range_data.horizontal_min, 109 monitor->data.range_data.horizontal_max, 110 monitor->data.range_data.vertical_min, 111 monitor->data.range_data.vertical_max, 112 monitor->data.range_data.pixel_clock_max * 10); 113 } else { 114 uint32_t pixclock, h_active, h_blanking, v_active, v_blanking; 115 uint32_t h_total, v_total, vfreq; 116 117 pixclock = EDID_DETAILED_TIMING_PIXEL_CLOCK(*timing); 118 h_active = EDID_DETAILED_TIMING_HORIZONTAL_ACTIVE(*timing); 119 h_blanking = EDID_DETAILED_TIMING_HORIZONTAL_BLANKING(*timing); 120 v_active = EDID_DETAILED_TIMING_VERTICAL_ACTIVE(*timing); 121 v_blanking = EDID_DETAILED_TIMING_VERTICAL_BLANKING(*timing); 122 123 h_total = h_active + h_blanking; 124 v_total = v_active + v_blanking; 125 if (v_total * h_total) 126 vfreq = pixclock / (v_total * h_total); 127 else 128 vfreq = 1; /* Error case */ 129 printf("\t%dx%d\%c\t%d Hz (detailed)\n", h_active, 130 v_active, h_active > 1000 ? ' ' : '\t', vfreq); 131 *have_timing = 1; 132 } 133 } 134 135 /** 136 * Get the manufacturer name from an EDID info. 137 * 138 * @param edid_info The EDID info to be printed 139 * @param name Returns the string of the manufacturer name 140 */ 141 static void edid_get_manufacturer_name(struct edid1_info *edid, char *name) 142 { 143 name[0] = EDID1_INFO_MANUFACTURER_NAME_CHAR1(*edid) + 'A' - 1; 144 name[1] = EDID1_INFO_MANUFACTURER_NAME_CHAR2(*edid) + 'A' - 1; 145 name[2] = EDID1_INFO_MANUFACTURER_NAME_CHAR3(*edid) + 'A' - 1; 146 name[3] = '\0'; 147 } 148 149 void edid_print_info(struct edid1_info *edid_info) 150 { 151 int i; 152 char manufacturer[4]; 153 unsigned int have_timing = 0; 154 uint32_t serial_number; 155 156 if (edid_check_info(edid_info)) { 157 printf("Not a valid EDID\n"); 158 return; 159 } 160 161 printf("EDID version: %d.%d\n", 162 edid_info->version, edid_info->revision); 163 164 printf("Product ID code: %04x\n", EDID1_INFO_PRODUCT_CODE(*edid_info)); 165 166 edid_get_manufacturer_name(edid_info, manufacturer); 167 printf("Manufacturer: %s\n", manufacturer); 168 169 serial_number = EDID1_INFO_SERIAL_NUMBER(*edid_info); 170 if (serial_number != 0xffffffff) { 171 if (strcmp(manufacturer, "MAG") == 0) 172 serial_number -= 0x7000000; 173 if (strcmp(manufacturer, "OQI") == 0) 174 serial_number -= 456150000; 175 if (strcmp(manufacturer, "VSC") == 0) 176 serial_number -= 640000000; 177 } 178 printf("Serial number: %08x\n", serial_number); 179 printf("Manufactured in week: %d year: %d\n", 180 edid_info->week, edid_info->year + 1990); 181 182 printf("Video input definition: %svoltage level %d%s%s%s%s%s\n", 183 EDID1_INFO_VIDEO_INPUT_DIGITAL(*edid_info) ? 184 "digital signal, " : "analog signal, ", 185 EDID1_INFO_VIDEO_INPUT_VOLTAGE_LEVEL(*edid_info), 186 EDID1_INFO_VIDEO_INPUT_BLANK_TO_BLACK(*edid_info) ? 187 ", blank to black" : "", 188 EDID1_INFO_VIDEO_INPUT_SEPARATE_SYNC(*edid_info) ? 189 ", separate sync" : "", 190 EDID1_INFO_VIDEO_INPUT_COMPOSITE_SYNC(*edid_info) ? 191 ", composite sync" : "", 192 EDID1_INFO_VIDEO_INPUT_SYNC_ON_GREEN(*edid_info) ? 193 ", sync on green" : "", 194 EDID1_INFO_VIDEO_INPUT_SERRATION_V(*edid_info) ? 195 ", serration v" : ""); 196 197 printf("Monitor is %s\n", 198 EDID1_INFO_FEATURE_RGB(*edid_info) ? "RGB" : "non-RGB"); 199 200 printf("Maximum visible display size: %d cm x %d cm\n", 201 edid_info->max_size_horizontal, 202 edid_info->max_size_vertical); 203 204 printf("Power management features: %s%s, %s%s, %s%s\n", 205 EDID1_INFO_FEATURE_ACTIVE_OFF(*edid_info) ? 206 "" : "no ", "active off", 207 EDID1_INFO_FEATURE_SUSPEND(*edid_info) ? "" : "no ", "suspend", 208 EDID1_INFO_FEATURE_STANDBY(*edid_info) ? "" : "no ", "standby"); 209 210 printf("Estabilished timings:\n"); 211 if (EDID1_INFO_ESTABLISHED_TIMING_720X400_70(*edid_info)) 212 printf("\t720x400\t\t70 Hz (VGA 640x400, IBM)\n"); 213 if (EDID1_INFO_ESTABLISHED_TIMING_720X400_88(*edid_info)) 214 printf("\t720x400\t\t88 Hz (XGA2)\n"); 215 if (EDID1_INFO_ESTABLISHED_TIMING_640X480_60(*edid_info)) 216 printf("\t640x480\t\t60 Hz (VGA)\n"); 217 if (EDID1_INFO_ESTABLISHED_TIMING_640X480_67(*edid_info)) 218 printf("\t640x480\t\t67 Hz (Mac II, Apple)\n"); 219 if (EDID1_INFO_ESTABLISHED_TIMING_640X480_72(*edid_info)) 220 printf("\t640x480\t\t72 Hz (VESA)\n"); 221 if (EDID1_INFO_ESTABLISHED_TIMING_640X480_75(*edid_info)) 222 printf("\t640x480\t\t75 Hz (VESA)\n"); 223 if (EDID1_INFO_ESTABLISHED_TIMING_800X600_56(*edid_info)) 224 printf("\t800x600\t\t56 Hz (VESA)\n"); 225 if (EDID1_INFO_ESTABLISHED_TIMING_800X600_60(*edid_info)) 226 printf("\t800x600\t\t60 Hz (VESA)\n"); 227 if (EDID1_INFO_ESTABLISHED_TIMING_800X600_72(*edid_info)) 228 printf("\t800x600\t\t72 Hz (VESA)\n"); 229 if (EDID1_INFO_ESTABLISHED_TIMING_800X600_75(*edid_info)) 230 printf("\t800x600\t\t75 Hz (VESA)\n"); 231 if (EDID1_INFO_ESTABLISHED_TIMING_832X624_75(*edid_info)) 232 printf("\t832x624\t\t75 Hz (Mac II)\n"); 233 if (EDID1_INFO_ESTABLISHED_TIMING_1024X768_87I(*edid_info)) 234 printf("\t1024x768\t87 Hz Interlaced (8514A)\n"); 235 if (EDID1_INFO_ESTABLISHED_TIMING_1024X768_60(*edid_info)) 236 printf("\t1024x768\t60 Hz (VESA)\n"); 237 if (EDID1_INFO_ESTABLISHED_TIMING_1024X768_70(*edid_info)) 238 printf("\t1024x768\t70 Hz (VESA)\n"); 239 if (EDID1_INFO_ESTABLISHED_TIMING_1024X768_75(*edid_info)) 240 printf("\t1024x768\t75 Hz (VESA)\n"); 241 if (EDID1_INFO_ESTABLISHED_TIMING_1280X1024_75(*edid_info)) 242 printf("\t1280x1024\t75 (VESA)\n"); 243 if (EDID1_INFO_ESTABLISHED_TIMING_1152X870_75(*edid_info)) 244 printf("\t1152x870\t75 (Mac II)\n"); 245 246 /* Standard timings. */ 247 printf("Standard timings:\n"); 248 for (i = 0; i < ARRAY_SIZE(edid_info->standard_timings); i++) { 249 unsigned int aspect = 10000; 250 unsigned int x, y; 251 unsigned char xres, vfreq; 252 253 xres = EDID1_INFO_STANDARD_TIMING_XRESOLUTION(*edid_info, i); 254 vfreq = EDID1_INFO_STANDARD_TIMING_VFREQ(*edid_info, i); 255 if ((xres != vfreq) || 256 ((xres != 0) && (xres != 1)) || 257 ((vfreq != 0) && (vfreq != 1))) { 258 switch (EDID1_INFO_STANDARD_TIMING_ASPECT(*edid_info, 259 i)) { 260 case ASPECT_625: 261 aspect = 6250; 262 break; 263 case ASPECT_75: 264 aspect = 7500; 265 break; 266 case ASPECT_8: 267 aspect = 8000; 268 break; 269 case ASPECT_5625: 270 aspect = 5625; 271 break; 272 } 273 x = (xres + 31) * 8; 274 y = x * aspect / 10000; 275 printf("\t%dx%d%c\t%d Hz\n", x, y, 276 x > 1000 ? ' ' : '\t', (vfreq & 0x3f) + 60); 277 have_timing = 1; 278 } 279 } 280 281 /* Detailed timing information. */ 282 for (i = 0; i < ARRAY_SIZE(edid_info->monitor_details.descriptor); 283 i++) { 284 edid_print_dtd(&edid_info->monitor_details.descriptor[i], 285 &have_timing); 286 } 287 288 if (!have_timing) 289 printf("\tNone\n"); 290 } 291