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d46b5f7d TWHT |
1 | /* |
2 | * Copyright (c) 2012 The Chromium OS Authors. | |
3 | * | |
4 | * (C) Copyright 2010 | |
5 | * Petr Stetiar <ynezz@true.cz> | |
6 | * | |
1a459660 | 7 | * SPDX-License-Identifier: GPL-2.0+ |
d46b5f7d TWHT |
8 | * |
9 | * Contains stolen code from ddcprobe project which is: | |
10 | * Copyright (C) Nalin Dahyabhai <bigfun@pobox.com> | |
d46b5f7d TWHT |
11 | */ |
12 | ||
13 | #include <common.h> | |
14 | #include <edid.h> | |
e745d064 | 15 | #include <errno.h> |
00cf1167 | 16 | #include <fdtdec.h> |
d46b5f7d TWHT |
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 | ||
e745d064 HG |
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 | ||
d46b5f7d TWHT |
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 | ||
00cf1167 SG |
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 | ||
d46b5f7d TWHT |
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 | } |