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"Das U-Boot" Source Tree
1// SPDX-License-Identifier: GPL-2.0+
2/*
3 * Copyright (c) 2012 The Chromium OS Authors.
4 *
5 * (C) Copyright 2010
6 * Petr Stetiar <ynezz@true.cz>
7 *
8 * Contains stolen code from ddcprobe project which is:
9 * Copyright (C) Nalin Dahyabhai <bigfun@pobox.com>
10 */
11
12#include <edid.h>
13#include <errno.h>
14#include <fdtdec.h>
15#include <log.h>
16#include <linux/ctype.h>
17#include <linux/string.h>
18
19int 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
33int 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
44int 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/* Set all parts of a timing entry to the same value */
69static void set_entry(struct timing_entry *entry, u32 value)
70{
71 entry->min = value;
72 entry->typ = value;
73 entry->max = value;
74}
75
76/**
77 * decode_timing() - Decoding an 18-byte detailed timing record
78 *
79 * @buf: Pointer to EDID detailed timing record
80 * @timing: Place to put timing
81 */
82static void decode_timing(u8 *buf, struct display_timing *timing)
83{
84 uint x_mm, y_mm;
85 unsigned int ha, hbl, hso, hspw, hborder;
86 unsigned int va, vbl, vso, vspw, vborder;
87 struct edid_detailed_timing *t = (struct edid_detailed_timing *)buf;
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 timing->flags = 0;
115 if (EDID_DETAILED_TIMING_FLAG_HSYNC_POLARITY(*t))
116 timing->flags |= DISPLAY_FLAGS_HSYNC_HIGH;
117 else
118 timing->flags |= DISPLAY_FLAGS_HSYNC_LOW;
119 if (EDID_DETAILED_TIMING_FLAG_VSYNC_POLARITY(*t))
120 timing->flags |= DISPLAY_FLAGS_VSYNC_HIGH;
121 else
122 timing->flags |= DISPLAY_FLAGS_VSYNC_LOW;
123
124 if (EDID_DETAILED_TIMING_FLAG_INTERLACED(*t))
125 timing->flags = DISPLAY_FLAGS_INTERLACED;
126
127 debug("Detailed mode clock %u Hz, %d mm x %d mm\n"
128 " %04x %04x %04x %04x hborder %x\n"
129 " %04x %04x %04x %04x vborder %x\n",
130 timing->pixelclock.typ,
131 x_mm, y_mm,
132 ha, ha + hso, ha + hso + hspw,
133 ha + hbl, hborder,
134 va, va + vso, va + vso + vspw,
135 va + vbl, vborder);
136}
137
138/**
139 * Check if HDMI vendor specific data block is present in CEA block
140 * @param info CEA extension block
141 * Return: true if block is found
142 */
143static bool cea_is_hdmi_vsdb_present(struct edid_cea861_info *info)
144{
145 u8 end, i = 0;
146
147 /* check for end of data block */
148 end = info->dtd_offset;
149 if (end == 0)
150 end = sizeof(info->data);
151 if (end < 4 || end > sizeof(info->data))
152 return false;
153 end -= 4;
154
155 while (i < end) {
156 /* Look for vendor specific data block of appropriate size */
157 if ((EDID_CEA861_DB_TYPE(*info, i) == EDID_CEA861_DB_VENDOR) &&
158 (EDID_CEA861_DB_LEN(*info, i) >= 5)) {
159 u8 *db = &info->data[i + 1];
160 u32 oui = db[0] | (db[1] << 8) | (db[2] << 16);
161
162 if (oui == HDMI_IEEE_OUI)
163 return true;
164 }
165 i += EDID_CEA861_DB_LEN(*info, i) + 1;
166 }
167
168 return false;
169}
170
171static bool edid_find_valid_timing(void *buf, int count,
172 struct display_timing *timing,
173 bool (*mode_valid)(void *priv,
174 const struct display_timing *timing),
175 void *mode_valid_priv)
176{
177 struct edid_detailed_timing *t = buf;
178 bool found = false;
179 int i;
180
181 for (i = 0; i < count && !found; i++, t++)
182 if (EDID_DETAILED_TIMING_PIXEL_CLOCK(*t) != 0) {
183 decode_timing((u8 *)t, timing);
184 if (mode_valid)
185 found = mode_valid(mode_valid_priv,
186 timing);
187 else
188 found = true;
189 }
190
191 return found;
192}
193
194int edid_get_timing_validate(u8 *buf, int buf_size,
195 struct display_timing *timing,
196 int *panel_bits_per_colourp,
197 bool (*mode_valid)(void *priv,
198 const struct display_timing *timing),
199 void *mode_valid_priv)
200{
201 struct edid1_info *edid = (struct edid1_info *)buf;
202 bool found;
203
204 if (buf_size < sizeof(*edid) || edid_check_info(edid)) {
205 debug("%s: Invalid buffer\n", __func__);
206 return -EINVAL;
207 }
208
209 if (!EDID1_INFO_VIDEO_INPUT_DIGITAL(*edid)) {
210 debug("%s: Not a digital display\n", __func__);
211 return -ENOSYS;
212 }
213
214 if (!EDID1_INFO_FEATURE_PREFERRED_TIMING_MODE(*edid)) {
215 debug("%s: No preferred timing\n", __func__);
216 return -ENOENT;
217 }
218
219 /* Look for detailed timing in base EDID */
220 found = edid_find_valid_timing(edid->monitor_details.descriptor, 4,
221 timing, mode_valid, mode_valid_priv);
222
223 /* Look for detailed timing in CTA-861 Extension Block */
224 if (!found && edid->extension_flag && buf_size >= EDID_EXT_SIZE) {
225 struct edid_cea861_info *info =
226 (struct edid_cea861_info *)(buf + sizeof(*edid));
227
228 if (info->extension_tag == EDID_CEA861_EXTENSION_TAG) {
229 int count = EDID_CEA861_DTD_COUNT(*info);
230 int offset = info->dtd_offset;
231 int size = count * sizeof(struct edid_detailed_timing);
232
233 if (offset >= 4 && offset + size < EDID_SIZE)
234 found = edid_find_valid_timing(
235 (u8 *)info + offset, count, timing,
236 mode_valid, mode_valid_priv);
237 }
238 }
239
240 if (!found)
241 return -EINVAL;
242
243 if (edid->version != 1 || edid->revision < 4) {
244 debug("%s: EDID version %d.%d does not have required info\n",
245 __func__, edid->version, edid->revision);
246 *panel_bits_per_colourp = -1;
247 } else {
248 *panel_bits_per_colourp =
249 ((edid->video_input_definition & 0x70) >> 3) + 4;
250 }
251
252 timing->hdmi_monitor = false;
253 if (edid->extension_flag && (buf_size >= EDID_EXT_SIZE)) {
254 struct edid_cea861_info *info =
255 (struct edid_cea861_info *)(buf + sizeof(*edid));
256
257 if (info->extension_tag == EDID_CEA861_EXTENSION_TAG)
258 timing->hdmi_monitor = cea_is_hdmi_vsdb_present(info);
259 }
260
261 return 0;
262}
263
264int edid_get_timing(u8 *buf, int buf_size, struct display_timing *timing,
265 int *panel_bits_per_colourp)
266{
267 return edid_get_timing_validate(buf, buf_size, timing,
268 panel_bits_per_colourp, NULL, NULL);
269}
270
271/**
272 * Snip the tailing whitespace/return of a string.
273 *
274 * @param string The string to be snipped
275 * Return: the snipped string
276 */
277static char *snip(char *string)
278{
279 char *s;
280
281 /*
282 * This is always a 13 character buffer
283 * and it's not always terminated.
284 */
285 string[12] = '\0';
286 s = &string[strlen(string) - 1];
287
288 while (s >= string && (isspace(*s) || *s == '\n' || *s == '\r' ||
289 *s == '\0'))
290 *(s--) = '\0';
291
292 return string;
293}
294
295/**
296 * Print an EDID monitor descriptor block
297 *
298 * @param monitor The EDID monitor descriptor block
299 * @have_timing Modifies to 1 if the desciptor contains timing info
300 */
301static void edid_print_dtd(struct edid_monitor_descriptor *monitor,
302 unsigned int *have_timing)
303{
304 unsigned char *bytes = (unsigned char *)monitor;
305 struct edid_detailed_timing *timing =
306 (struct edid_detailed_timing *)monitor;
307
308 if (bytes[0] == 0 && bytes[1] == 0) {
309 if (monitor->type == EDID_MONITOR_DESCRIPTOR_SERIAL)
310 printf("Monitor serial number: %s\n",
311 snip(monitor->data.string));
312 else if (monitor->type == EDID_MONITOR_DESCRIPTOR_ASCII)
313 printf("Monitor ID: %s\n",
314 snip(monitor->data.string));
315 else if (monitor->type == EDID_MONITOR_DESCRIPTOR_NAME)
316 printf("Monitor name: %s\n",
317 snip(monitor->data.string));
318 else if (monitor->type == EDID_MONITOR_DESCRIPTOR_RANGE)
319 printf("Monitor range limits, horizontal sync: "
320 "%d-%d kHz, vertical refresh: "
321 "%d-%d Hz, max pixel clock: "
322 "%d MHz\n",
323 monitor->data.range_data.horizontal_min,
324 monitor->data.range_data.horizontal_max,
325 monitor->data.range_data.vertical_min,
326 monitor->data.range_data.vertical_max,
327 monitor->data.range_data.pixel_clock_max * 10);
328 } else {
329 uint32_t pixclock, h_active, h_blanking, v_active, v_blanking;
330 uint32_t h_total, v_total, vfreq;
331
332 pixclock = EDID_DETAILED_TIMING_PIXEL_CLOCK(*timing);
333 h_active = EDID_DETAILED_TIMING_HORIZONTAL_ACTIVE(*timing);
334 h_blanking = EDID_DETAILED_TIMING_HORIZONTAL_BLANKING(*timing);
335 v_active = EDID_DETAILED_TIMING_VERTICAL_ACTIVE(*timing);
336 v_blanking = EDID_DETAILED_TIMING_VERTICAL_BLANKING(*timing);
337
338 h_total = h_active + h_blanking;
339 v_total = v_active + v_blanking;
340 if (v_total > 0 && h_total > 0)
341 vfreq = pixclock / (v_total * h_total);
342 else
343 vfreq = 1; /* Error case */
344 printf("\t%dx%d\%c\t%d Hz (detailed)\n", h_active,
345 v_active, h_active > 1000 ? ' ' : '\t', vfreq);
346 *have_timing = 1;
347 }
348}
349
350/**
351 * Get the manufacturer name from an EDID info.
352 *
353 * @param edid_info The EDID info to be printed
354 * @param name Returns the string of the manufacturer name
355 */
356static void edid_get_manufacturer_name(struct edid1_info *edid, char *name)
357{
358 name[0] = EDID1_INFO_MANUFACTURER_NAME_CHAR1(*edid) + 'A' - 1;
359 name[1] = EDID1_INFO_MANUFACTURER_NAME_CHAR2(*edid) + 'A' - 1;
360 name[2] = EDID1_INFO_MANUFACTURER_NAME_CHAR3(*edid) + 'A' - 1;
361 name[3] = '\0';
362}
363
364void edid_print_info(struct edid1_info *edid_info)
365{
366 int i;
367 char manufacturer[4];
368 unsigned int have_timing = 0;
369 uint32_t serial_number;
370
371 if (edid_check_info(edid_info)) {
372 printf("Not a valid EDID\n");
373 return;
374 }
375
376 printf("EDID version: %d.%d\n",
377 edid_info->version, edid_info->revision);
378
379 printf("Product ID code: %04x\n", EDID1_INFO_PRODUCT_CODE(*edid_info));
380
381 edid_get_manufacturer_name(edid_info, manufacturer);
382 printf("Manufacturer: %s\n", manufacturer);
383
384 serial_number = EDID1_INFO_SERIAL_NUMBER(*edid_info);
385 if (serial_number != 0xffffffff) {
386 if (strcmp(manufacturer, "MAG") == 0)
387 serial_number -= 0x7000000;
388 if (strcmp(manufacturer, "OQI") == 0)
389 serial_number -= 456150000;
390 if (strcmp(manufacturer, "VSC") == 0)
391 serial_number -= 640000000;
392 }
393 printf("Serial number: %08x\n", serial_number);
394 printf("Manufactured in week: %d year: %d\n",
395 edid_info->week, edid_info->year + 1990);
396
397 printf("Video input definition: %svoltage level %d%s%s%s%s%s\n",
398 EDID1_INFO_VIDEO_INPUT_DIGITAL(*edid_info) ?
399 "digital signal, " : "analog signal, ",
400 EDID1_INFO_VIDEO_INPUT_VOLTAGE_LEVEL(*edid_info),
401 EDID1_INFO_VIDEO_INPUT_BLANK_TO_BLACK(*edid_info) ?
402 ", blank to black" : "",
403 EDID1_INFO_VIDEO_INPUT_SEPARATE_SYNC(*edid_info) ?
404 ", separate sync" : "",
405 EDID1_INFO_VIDEO_INPUT_COMPOSITE_SYNC(*edid_info) ?
406 ", composite sync" : "",
407 EDID1_INFO_VIDEO_INPUT_SYNC_ON_GREEN(*edid_info) ?
408 ", sync on green" : "",
409 EDID1_INFO_VIDEO_INPUT_SERRATION_V(*edid_info) ?
410 ", serration v" : "");
411
412 printf("Monitor is %s\n",
413 EDID1_INFO_FEATURE_RGB(*edid_info) ? "RGB" : "non-RGB");
414
415 printf("Maximum visible display size: %d cm x %d cm\n",
416 edid_info->max_size_horizontal,
417 edid_info->max_size_vertical);
418
419 printf("Power management features: %s%s, %s%s, %s%s\n",
420 EDID1_INFO_FEATURE_ACTIVE_OFF(*edid_info) ?
421 "" : "no ", "active off",
422 EDID1_INFO_FEATURE_SUSPEND(*edid_info) ? "" : "no ", "suspend",
423 EDID1_INFO_FEATURE_STANDBY(*edid_info) ? "" : "no ", "standby");
424
425 printf("Estabilished timings:\n");
426 if (EDID1_INFO_ESTABLISHED_TIMING_720X400_70(*edid_info))
427 printf("\t720x400\t\t70 Hz (VGA 640x400, IBM)\n");
428 if (EDID1_INFO_ESTABLISHED_TIMING_720X400_88(*edid_info))
429 printf("\t720x400\t\t88 Hz (XGA2)\n");
430 if (EDID1_INFO_ESTABLISHED_TIMING_640X480_60(*edid_info))
431 printf("\t640x480\t\t60 Hz (VGA)\n");
432 if (EDID1_INFO_ESTABLISHED_TIMING_640X480_67(*edid_info))
433 printf("\t640x480\t\t67 Hz (Mac II, Apple)\n");
434 if (EDID1_INFO_ESTABLISHED_TIMING_640X480_72(*edid_info))
435 printf("\t640x480\t\t72 Hz (VESA)\n");
436 if (EDID1_INFO_ESTABLISHED_TIMING_640X480_75(*edid_info))
437 printf("\t640x480\t\t75 Hz (VESA)\n");
438 if (EDID1_INFO_ESTABLISHED_TIMING_800X600_56(*edid_info))
439 printf("\t800x600\t\t56 Hz (VESA)\n");
440 if (EDID1_INFO_ESTABLISHED_TIMING_800X600_60(*edid_info))
441 printf("\t800x600\t\t60 Hz (VESA)\n");
442 if (EDID1_INFO_ESTABLISHED_TIMING_800X600_72(*edid_info))
443 printf("\t800x600\t\t72 Hz (VESA)\n");
444 if (EDID1_INFO_ESTABLISHED_TIMING_800X600_75(*edid_info))
445 printf("\t800x600\t\t75 Hz (VESA)\n");
446 if (EDID1_INFO_ESTABLISHED_TIMING_832X624_75(*edid_info))
447 printf("\t832x624\t\t75 Hz (Mac II)\n");
448 if (EDID1_INFO_ESTABLISHED_TIMING_1024X768_87I(*edid_info))
449 printf("\t1024x768\t87 Hz Interlaced (8514A)\n");
450 if (EDID1_INFO_ESTABLISHED_TIMING_1024X768_60(*edid_info))
451 printf("\t1024x768\t60 Hz (VESA)\n");
452 if (EDID1_INFO_ESTABLISHED_TIMING_1024X768_70(*edid_info))
453 printf("\t1024x768\t70 Hz (VESA)\n");
454 if (EDID1_INFO_ESTABLISHED_TIMING_1024X768_75(*edid_info))
455 printf("\t1024x768\t75 Hz (VESA)\n");
456 if (EDID1_INFO_ESTABLISHED_TIMING_1280X1024_75(*edid_info))
457 printf("\t1280x1024\t75 (VESA)\n");
458 if (EDID1_INFO_ESTABLISHED_TIMING_1152X870_75(*edid_info))
459 printf("\t1152x870\t75 (Mac II)\n");
460
461 /* Standard timings. */
462 printf("Standard timings:\n");
463 for (i = 0; i < ARRAY_SIZE(edid_info->standard_timings); i++) {
464 unsigned int aspect = 10000;
465 unsigned int x, y;
466 unsigned char xres, vfreq;
467
468 xres = EDID1_INFO_STANDARD_TIMING_XRESOLUTION(*edid_info, i);
469 vfreq = EDID1_INFO_STANDARD_TIMING_VFREQ(*edid_info, i);
470 if ((xres != vfreq) ||
471 ((xres != 0) && (xres != 1)) ||
472 ((vfreq != 0) && (vfreq != 1))) {
473 switch (EDID1_INFO_STANDARD_TIMING_ASPECT(*edid_info,
474 i)) {
475 case ASPECT_625:
476 aspect = 6250;
477 break;
478 case ASPECT_75:
479 aspect = 7500;
480 break;
481 case ASPECT_8:
482 aspect = 8000;
483 break;
484 case ASPECT_5625:
485 aspect = 5625;
486 break;
487 }
488 x = (xres + 31) * 8;
489 y = x * aspect / 10000;
490 printf("\t%dx%d%c\t%d Hz\n", x, y,
491 x > 1000 ? ' ' : '\t', (vfreq & 0x3f) + 60);
492 have_timing = 1;
493 }
494 }
495
496 /* Detailed timing information. */
497 for (i = 0; i < ARRAY_SIZE(edid_info->monitor_details.descriptor);
498 i++) {
499 edid_print_dtd(&edid_info->monitor_details.descriptor[i],
500 &have_timing);
501 }
502
503 if (!have_timing)
504 printf("\tNone\n");
505}