Line data Source code
1 : /*
2 : * linux/drivers/video/fbmon.c
3 : *
4 : * Copyright (C) 2002 James Simmons <jsimmons@users.sf.net>
5 : *
6 : * Credits:
7 : *
8 : * The EDID Parser is a conglomeration from the following sources:
9 : *
10 : * 1. SciTech SNAP Graphics Architecture
11 : * Copyright (C) 1991-2002 SciTech Software, Inc. All rights reserved.
12 : *
13 : * 2. XFree86 4.3.0, interpret_edid.c
14 : * Copyright 1998 by Egbert Eich <Egbert.Eich@Physik.TU-Darmstadt.DE>
15 : *
16 : * 3. John Fremlin <vii@users.sourceforge.net> and
17 : * Ani Joshi <ajoshi@unixbox.com>
18 : *
19 : * Generalized Timing Formula is derived from:
20 : *
21 : * GTF Spreadsheet by Andy Morrish (1/5/97)
22 : * available at http://www.vesa.org
23 : *
24 : * This file is subject to the terms and conditions of the GNU General Public
25 : * License. See the file COPYING in the main directory of this archive
26 : * for more details.
27 : *
28 : */
29 : #include <linux/fb.h>
30 : #include <linux/module.h>
31 : #include <linux/pci.h>
32 : #include <video/edid.h>
33 : #ifdef CONFIG_PPC_OF
34 : #include <asm/prom.h>
35 : #include <asm/pci-bridge.h>
36 : #endif
37 : #include "edid.h"
38 :
39 : /*
40 : * EDID parser
41 : */
42 :
43 : #undef DEBUG /* define this for verbose EDID parsing output */
44 :
45 : #ifdef DEBUG
46 : #define DPRINTK(fmt, args...) printk(fmt,## args)
47 : #else
48 : #define DPRINTK(fmt, args...)
49 : #endif
50 :
51 : #define FBMON_FIX_HEADER 1
52 : #define FBMON_FIX_INPUT 2
53 : #define FBMON_FIX_TIMINGS 3
54 :
55 : #ifdef CONFIG_FB_MODE_HELPERS
56 : struct broken_edid {
57 : u8 manufacturer[4];
58 : u32 model;
59 : u32 fix;
60 : };
61 :
62 1 : static const struct broken_edid brokendb[] = {
63 : /* DEC FR-PCXAV-YZ */
64 : {
65 : .manufacturer = "DEC",
66 : .model = 0x073a,
67 : .fix = FBMON_FIX_HEADER,
68 : },
69 : /* ViewSonic PF775a */
70 : {
71 : .manufacturer = "VSC",
72 : .model = 0x5a44,
73 : .fix = FBMON_FIX_INPUT,
74 : },
75 : /* Sharp UXGA? */
76 : {
77 : .manufacturer = "SHP",
78 : .model = 0x138e,
79 : .fix = FBMON_FIX_TIMINGS,
80 : },
81 : };
82 :
83 1 : static const unsigned char edid_v1_header[] = { 0x00, 0xff, 0xff, 0xff,
84 : 0xff, 0xff, 0xff, 0x00
85 : };
86 :
87 : static void copy_string(unsigned char *c, unsigned char *s)
88 : {
89 0 : int i;
90 0 : c = c + 5;
91 0 : for (i = 0; (i < 13 && *c != 0x0A); i++)
92 0 : *(s++) = *(c++);
93 0 : *s = 0;
94 0 : while (i-- && (*--s == 0x20)) *s = 0;
95 0 : }
96 0 :
97 : static int edid_is_serial_block(unsigned char *block)
98 : {
99 0 : if ((block[0] == 0x00) && (block[1] == 0x00) &&
100 : (block[2] == 0x00) && (block[3] == 0xff) &&
101 0 : (block[4] == 0x00))
102 0 : return 1;
103 : else
104 0 : return 0;
105 : }
106 :
107 : static int edid_is_ascii_block(unsigned char *block)
108 : {
109 0 : if ((block[0] == 0x00) && (block[1] == 0x00) &&
110 : (block[2] == 0x00) && (block[3] == 0xfe) &&
111 : (block[4] == 0x00))
112 0 : return 1;
113 : else
114 0 : return 0;
115 : }
116 :
117 : static int edid_is_limits_block(unsigned char *block)
118 : {
119 0 : if ((block[0] == 0x00) && (block[1] == 0x00) &&
120 : (block[2] == 0x00) && (block[3] == 0xfd) &&
121 : (block[4] == 0x00))
122 0 : return 1;
123 : else
124 0 : return 0;
125 : }
126 :
127 : static int edid_is_monitor_block(unsigned char *block)
128 : {
129 0 : if ((block[0] == 0x00) && (block[1] == 0x00) &&
130 : (block[2] == 0x00) && (block[3] == 0xfc) &&
131 : (block[4] == 0x00))
132 0 : return 1;
133 : else
134 0 : return 0;
135 : }
136 :
137 : static int edid_is_timing_block(unsigned char *block)
138 : {
139 0 : if ((block[0] != 0x00) || (block[1] != 0x00) ||
140 : (block[2] != 0x00) || (block[4] != 0x00))
141 0 : return 1;
142 : else
143 0 : return 0;
144 : }
145 :
146 : static int check_edid(unsigned char *edid)
147 : {
148 0 : unsigned char *block = edid + ID_MANUFACTURER_NAME, manufacturer[4];
149 0 : unsigned char *b;
150 0 : u32 model;
151 0 : int i, fix = 0, ret = 0;
152 0 :
153 0 : manufacturer[0] = ((block[0] & 0x7c) >> 2) + '@';
154 0 : manufacturer[1] = ((block[0] & 0x03) << 3) +
155 0 : ((block[1] & 0xe0) >> 5) + '@';
156 0 : manufacturer[2] = (block[1] & 0x1f) + '@';
157 0 : manufacturer[3] = 0;
158 0 : model = block[2] + (block[3] << 8);
159 :
160 0 : for (i = 0; i < ARRAY_SIZE(brokendb); i++) {
161 0 : if (!strncmp(manufacturer, brokendb[i].manufacturer, 4) &&
162 0 : brokendb[i].model == model) {
163 0 : fix = brokendb[i].fix;
164 0 : break;
165 : }
166 0 : }
167 :
168 0 : switch (fix) {
169 0 : case FBMON_FIX_HEADER:
170 0 : for (i = 0; i < 8; i++) {
171 0 : if (edid[i] != edid_v1_header[i]) {
172 0 : ret = fix;
173 0 : break;
174 : }
175 : }
176 0 : break;
177 0 : case FBMON_FIX_INPUT:
178 0 : b = edid + EDID_STRUCT_DISPLAY;
179 : /* Only if display is GTF capable will
180 : the input type be reset to analog */
181 0 : if (b[4] & 0x01 && b[0] & 0x80)
182 0 : ret = fix;
183 0 : break;
184 0 : case FBMON_FIX_TIMINGS:
185 0 : b = edid + DETAILED_TIMING_DESCRIPTIONS_START;
186 0 : ret = fix;
187 :
188 0 : for (i = 0; i < 4; i++) {
189 0 : if (edid_is_limits_block(b)) {
190 0 : ret = 0;
191 0 : break;
192 : }
193 :
194 0 : b += DETAILED_TIMING_DESCRIPTION_SIZE;
195 : }
196 :
197 0 : break;
198 0 : }
199 :
200 0 : if (ret)
201 0 : printk("fbmon: The EDID Block of "
202 : "Manufacturer: %s Model: 0x%x is known to "
203 : "be broken,\n", manufacturer, model);
204 :
205 0 : return ret;
206 : }
207 :
208 : static void fix_edid(unsigned char *edid, int fix)
209 : {
210 0 : int i;
211 0 : unsigned char *b, csum = 0;
212 0 :
213 0 : switch (fix) {
214 0 : case FBMON_FIX_HEADER:
215 0 : printk("fbmon: trying a header reconstruct\n");
216 0 : memcpy(edid, edid_v1_header, 8);
217 0 : break;
218 0 : case FBMON_FIX_INPUT:
219 0 : printk("fbmon: trying to fix input type\n");
220 0 : b = edid + EDID_STRUCT_DISPLAY;
221 0 : b[0] &= ~0x80;
222 0 : edid[127] += 0x80;
223 0 : break;
224 0 : case FBMON_FIX_TIMINGS:
225 0 : printk("fbmon: trying to fix monitor timings\n");
226 0 : b = edid + DETAILED_TIMING_DESCRIPTIONS_START;
227 0 : for (i = 0; i < 4; i++) {
228 0 : if (!(edid_is_serial_block(b) ||
229 0 : edid_is_ascii_block(b) ||
230 : edid_is_monitor_block(b) ||
231 : edid_is_timing_block(b))) {
232 0 : b[0] = 0x00;
233 0 : b[1] = 0x00;
234 0 : b[2] = 0x00;
235 0 : b[3] = 0xfd;
236 0 : b[4] = 0x00;
237 0 : b[5] = 60; /* vfmin */
238 0 : b[6] = 60; /* vfmax */
239 0 : b[7] = 30; /* hfmin */
240 0 : b[8] = 75; /* hfmax */
241 0 : b[9] = 17; /* pixclock - 170 MHz*/
242 0 : b[10] = 0; /* GTF */
243 0 : break;
244 : }
245 :
246 0 : b += DETAILED_TIMING_DESCRIPTION_SIZE;
247 : }
248 :
249 0 : for (i = 0; i < EDID_LENGTH - 1; i++)
250 0 : csum += edid[i];
251 0 :
252 0 : edid[127] = 256 - csum;
253 0 : break;
254 0 : }
255 : }
256 0 :
257 : static int edid_checksum(unsigned char *edid)
258 : {
259 0 : unsigned char csum = 0, all_null = 0;
260 0 : int i, err = 0, fix = check_edid(edid);
261 0 :
262 0 : if (fix)
263 0 : fix_edid(edid, fix);
264 0 :
265 0 : for (i = 0; i < EDID_LENGTH; i++) {
266 0 : csum += edid[i];
267 0 : all_null |= edid[i];
268 : }
269 :
270 0 : if (csum == 0x00 && all_null) {
271 : /* checksum passed, everything's good */
272 0 : err = 1;
273 : }
274 :
275 0 : return err;
276 : }
277 :
278 : static int edid_check_header(unsigned char *edid)
279 : {
280 0 : int i, err = 1, fix = check_edid(edid);
281 0 :
282 0 : if (fix)
283 0 : fix_edid(edid, fix);
284 :
285 0 : for (i = 0; i < 8; i++) {
286 0 : if (edid[i] != edid_v1_header[i])
287 0 : err = 0;
288 : }
289 :
290 0 : return err;
291 : }
292 :
293 : static void parse_vendor_block(unsigned char *block, struct fb_monspecs *specs)
294 : {
295 0 : specs->manufacturer[0] = ((block[0] & 0x7c) >> 2) + '@';
296 0 : specs->manufacturer[1] = ((block[0] & 0x03) << 3) +
297 : ((block[1] & 0xe0) >> 5) + '@';
298 0 : specs->manufacturer[2] = (block[1] & 0x1f) + '@';
299 0 : specs->manufacturer[3] = 0;
300 0 : specs->model = block[2] + (block[3] << 8);
301 0 : specs->serial = block[4] + (block[5] << 8) +
302 : (block[6] << 16) + (block[7] << 24);
303 0 : specs->year = block[9] + 1990;
304 0 : specs->week = block[8];
305 0 : DPRINTK(" Manufacturer: %s\n", specs->manufacturer);
306 : DPRINTK(" Model: %x\n", specs->model);
307 : DPRINTK(" Serial#: %u\n", specs->serial);
308 : DPRINTK(" Year: %u Week %u\n", specs->year, specs->week);
309 : }
310 :
311 : static void get_dpms_capabilities(unsigned char flags,
312 : struct fb_monspecs *specs)
313 : {
314 0 : specs->dpms = 0;
315 0 : if (flags & DPMS_ACTIVE_OFF)
316 0 : specs->dpms |= FB_DPMS_ACTIVE_OFF;
317 0 : if (flags & DPMS_SUSPEND)
318 0 : specs->dpms |= FB_DPMS_SUSPEND;
319 0 : if (flags & DPMS_STANDBY)
320 0 : specs->dpms |= FB_DPMS_STANDBY;
321 0 : DPRINTK(" DPMS: Active %s, Suspend %s, Standby %s\n",
322 : (flags & DPMS_ACTIVE_OFF) ? "yes" : "no",
323 : (flags & DPMS_SUSPEND) ? "yes" : "no",
324 : (flags & DPMS_STANDBY) ? "yes" : "no");
325 : }
326 :
327 : static void get_chroma(unsigned char *block, struct fb_monspecs *specs)
328 : {
329 0 : int tmp;
330 :
331 : DPRINTK(" Chroma\n");
332 : /* Chromaticity data */
333 0 : tmp = ((block[5] & (3 << 6)) >> 6) | (block[0x7] << 2);
334 0 : tmp *= 1000;
335 0 : tmp += 512;
336 0 : specs->chroma.redx = tmp/1024;
337 : DPRINTK(" RedX: 0.%03d ", specs->chroma.redx);
338 :
339 0 : tmp = ((block[5] & (3 << 4)) >> 4) | (block[0x8] << 2);
340 0 : tmp *= 1000;
341 0 : tmp += 512;
342 0 : specs->chroma.redy = tmp/1024;
343 : DPRINTK("RedY: 0.%03d\n", specs->chroma.redy);
344 :
345 0 : tmp = ((block[5] & (3 << 2)) >> 2) | (block[0x9] << 2);
346 0 : tmp *= 1000;
347 0 : tmp += 512;
348 0 : specs->chroma.greenx = tmp/1024;
349 : DPRINTK(" GreenX: 0.%03d ", specs->chroma.greenx);
350 :
351 0 : tmp = (block[5] & 3) | (block[0xa] << 2);
352 0 : tmp *= 1000;
353 0 : tmp += 512;
354 0 : specs->chroma.greeny = tmp/1024;
355 : DPRINTK("GreenY: 0.%03d\n", specs->chroma.greeny);
356 :
357 0 : tmp = ((block[6] & (3 << 6)) >> 6) | (block[0xb] << 2);
358 0 : tmp *= 1000;
359 0 : tmp += 512;
360 0 : specs->chroma.bluex = tmp/1024;
361 : DPRINTK(" BlueX: 0.%03d ", specs->chroma.bluex);
362 :
363 0 : tmp = ((block[6] & (3 << 4)) >> 4) | (block[0xc] << 2);
364 0 : tmp *= 1000;
365 0 : tmp += 512;
366 0 : specs->chroma.bluey = tmp/1024;
367 : DPRINTK("BlueY: 0.%03d\n", specs->chroma.bluey);
368 :
369 0 : tmp = ((block[6] & (3 << 2)) >> 2) | (block[0xd] << 2);
370 0 : tmp *= 1000;
371 0 : tmp += 512;
372 0 : specs->chroma.whitex = tmp/1024;
373 : DPRINTK(" WhiteX: 0.%03d ", specs->chroma.whitex);
374 :
375 0 : tmp = (block[6] & 3) | (block[0xe] << 2);
376 0 : tmp *= 1000;
377 0 : tmp += 512;
378 0 : specs->chroma.whitey = tmp/1024;
379 0 : DPRINTK("WhiteY: 0.%03d\n", specs->chroma.whitey);
380 : }
381 :
382 : static void calc_mode_timings(int xres, int yres, int refresh,
383 : struct fb_videomode *mode)
384 0 : {
385 0 : struct fb_var_screeninfo *var;
386 :
387 0 : var = kzalloc(sizeof(struct fb_var_screeninfo), GFP_KERNEL);
388 :
389 0 : if (var) {
390 0 : var->xres = xres;
391 0 : var->yres = yres;
392 0 : fb_get_mode(FB_VSYNCTIMINGS | FB_IGNOREMON,
393 : refresh, var, NULL);
394 0 : mode->xres = xres;
395 0 : mode->yres = yres;
396 0 : mode->pixclock = var->pixclock;
397 0 : mode->refresh = refresh;
398 0 : mode->left_margin = var->left_margin;
399 0 : mode->right_margin = var->right_margin;
400 0 : mode->upper_margin = var->upper_margin;
401 0 : mode->lower_margin = var->lower_margin;
402 0 : mode->hsync_len = var->hsync_len;
403 0 : mode->vsync_len = var->vsync_len;
404 0 : mode->vmode = 0;
405 0 : mode->sync = 0;
406 0 : kfree(var);
407 : }
408 0 : }
409 :
410 : static int get_est_timing(unsigned char *block, struct fb_videomode *mode)
411 : {
412 0 : int num = 0;
413 0 : unsigned char c;
414 0 :
415 0 : c = block[0];
416 0 : if (c&0x80) {
417 0 : calc_mode_timings(720, 400, 70, &mode[num]);
418 0 : mode[num++].flag = FB_MODE_IS_CALCULATED;
419 0 : DPRINTK(" 720x400@70Hz\n");
420 0 : }
421 0 : if (c&0x40) {
422 0 : calc_mode_timings(720, 400, 88, &mode[num]);
423 0 : mode[num++].flag = FB_MODE_IS_CALCULATED;
424 0 : DPRINTK(" 720x400@88Hz\n");
425 0 : }
426 0 : if (c&0x20) {
427 0 : mode[num++] = vesa_modes[3];
428 0 : DPRINTK(" 640x480@60Hz\n");
429 0 : }
430 0 : if (c&0x10) {
431 0 : calc_mode_timings(640, 480, 67, &mode[num]);
432 0 : mode[num++].flag = FB_MODE_IS_CALCULATED;
433 : DPRINTK(" 640x480@67Hz\n");
434 : }
435 0 : if (c&0x08) {
436 0 : mode[num++] = vesa_modes[4];
437 : DPRINTK(" 640x480@72Hz\n");
438 : }
439 0 : if (c&0x04) {
440 0 : mode[num++] = vesa_modes[5];
441 : DPRINTK(" 640x480@75Hz\n");
442 : }
443 0 : if (c&0x02) {
444 0 : mode[num++] = vesa_modes[7];
445 : DPRINTK(" 800x600@56Hz\n");
446 : }
447 0 : if (c&0x01) {
448 0 : mode[num++] = vesa_modes[8];
449 : DPRINTK(" 800x600@60Hz\n");
450 : }
451 :
452 0 : c = block[1];
453 0 : if (c&0x80) {
454 0 : mode[num++] = vesa_modes[9];
455 : DPRINTK(" 800x600@72Hz\n");
456 : }
457 0 : if (c&0x40) {
458 0 : mode[num++] = vesa_modes[10];
459 : DPRINTK(" 800x600@75Hz\n");
460 : }
461 0 : if (c&0x20) {
462 0 : calc_mode_timings(832, 624, 75, &mode[num]);
463 0 : mode[num++].flag = FB_MODE_IS_CALCULATED;
464 : DPRINTK(" 832x624@75Hz\n");
465 : }
466 0 : if (c&0x10) {
467 0 : mode[num++] = vesa_modes[12];
468 : DPRINTK(" 1024x768@87Hz Interlaced\n");
469 : }
470 0 : if (c&0x08) {
471 0 : mode[num++] = vesa_modes[13];
472 : DPRINTK(" 1024x768@60Hz\n");
473 : }
474 0 : if (c&0x04) {
475 0 : mode[num++] = vesa_modes[14];
476 : DPRINTK(" 1024x768@70Hz\n");
477 : }
478 0 : if (c&0x02) {
479 0 : mode[num++] = vesa_modes[15];
480 : DPRINTK(" 1024x768@75Hz\n");
481 : }
482 0 : if (c&0x01) {
483 0 : mode[num++] = vesa_modes[21];
484 : DPRINTK(" 1280x1024@75Hz\n");
485 : }
486 0 : c = block[2];
487 0 : if (c&0x80) {
488 0 : mode[num++] = vesa_modes[17];
489 : DPRINTK(" 1152x870@75Hz\n");
490 : }
491 : DPRINTK(" Manufacturer's mask: %x\n",c&0x7F);
492 0 : return num;
493 : }
494 :
495 : static int get_std_timing(unsigned char *block, struct fb_videomode *mode)
496 : {
497 0 : int xres, yres = 0, refresh, ratio, i;
498 0 :
499 0 : xres = (block[0] + 31) * 8;
500 0 : if (xres <= 256)
501 0 : return 0;
502 :
503 0 : ratio = (block[1] & 0xc0) >> 6;
504 0 : switch (ratio) {
505 0 : case 0:
506 0 : yres = xres;
507 0 : break;
508 0 : case 1:
509 0 : yres = (xres * 3)/4;
510 0 : break;
511 0 : case 2:
512 0 : yres = (xres * 4)/5;
513 0 : break;
514 0 : case 3:
515 0 : yres = (xres * 9)/16;
516 0 : break;
517 0 : }
518 0 : refresh = (block[1] & 0x3f) + 60;
519 0 :
520 : DPRINTK(" %dx%d@%dHz\n", xres, yres, refresh);
521 0 : for (i = 0; i < VESA_MODEDB_SIZE; i++) {
522 0 : if (vesa_modes[i].xres == xres &&
523 0 : vesa_modes[i].yres == yres &&
524 : vesa_modes[i].refresh == refresh) {
525 0 : *mode = vesa_modes[i];
526 0 : mode->flag |= FB_MODE_IS_STANDARD;
527 0 : return 1;
528 : }
529 : }
530 0 : calc_mode_timings(xres, yres, refresh, mode);
531 0 : return 1;
532 : }
533 :
534 : static int get_dst_timing(unsigned char *block,
535 : struct fb_videomode *mode)
536 0 : {
537 0 : int j, num = 0;
538 0 :
539 0 : for (j = 0; j < 6; j++, block += STD_TIMING_DESCRIPTION_SIZE)
540 0 : num += get_std_timing(block, &mode[num]);
541 0 :
542 0 : return num;
543 : }
544 :
545 : static void get_detailed_timing(unsigned char *block,
546 : struct fb_videomode *mode)
547 : {
548 0 : mode->xres = H_ACTIVE;
549 0 : mode->yres = V_ACTIVE;
550 0 : mode->pixclock = PIXEL_CLOCK;
551 0 : mode->pixclock /= 1000;
552 0 : mode->pixclock = KHZ2PICOS(mode->pixclock);
553 0 : mode->right_margin = H_SYNC_OFFSET;
554 0 : mode->left_margin = (H_ACTIVE + H_BLANKING) -
555 : (H_ACTIVE + H_SYNC_OFFSET + H_SYNC_WIDTH);
556 0 : mode->upper_margin = V_BLANKING - V_SYNC_OFFSET -
557 : V_SYNC_WIDTH;
558 0 : mode->lower_margin = V_SYNC_OFFSET;
559 0 : mode->hsync_len = H_SYNC_WIDTH;
560 0 : mode->vsync_len = V_SYNC_WIDTH;
561 0 : if (HSYNC_POSITIVE)
562 0 : mode->sync |= FB_SYNC_HOR_HIGH_ACT;
563 0 : if (VSYNC_POSITIVE)
564 0 : mode->sync |= FB_SYNC_VERT_HIGH_ACT;
565 0 : mode->refresh = PIXEL_CLOCK/((H_ACTIVE + H_BLANKING) *
566 : (V_ACTIVE + V_BLANKING));
567 0 : if (INTERLACED) {
568 0 : mode->yres *= 2;
569 0 : mode->upper_margin *= 2;
570 0 : mode->lower_margin *= 2;
571 0 : mode->vsync_len *= 2;
572 0 : mode->vmode |= FB_VMODE_INTERLACED;
573 : }
574 0 : mode->flag = FB_MODE_IS_DETAILED;
575 0 :
576 : DPRINTK(" %d MHz ", PIXEL_CLOCK/1000000);
577 : DPRINTK("%d %d %d %d ", H_ACTIVE, H_ACTIVE + H_SYNC_OFFSET,
578 : H_ACTIVE + H_SYNC_OFFSET + H_SYNC_WIDTH, H_ACTIVE + H_BLANKING);
579 : DPRINTK("%d %d %d %d ", V_ACTIVE, V_ACTIVE + V_SYNC_OFFSET,
580 : V_ACTIVE + V_SYNC_OFFSET + V_SYNC_WIDTH, V_ACTIVE + V_BLANKING);
581 : DPRINTK("%sHSync %sVSync\n\n", (HSYNC_POSITIVE) ? "+" : "-",
582 : (VSYNC_POSITIVE) ? "+" : "-");
583 : }
584 :
585 : /**
586 : * fb_create_modedb - create video mode database
587 : * @edid: EDID data
588 : * @dbsize: database size
589 : *
590 : * RETURNS: struct fb_videomode, @dbsize contains length of database
591 : *
592 : * DESCRIPTION:
593 : * This function builds a mode database using the contents of the EDID
594 : * data
595 : */
596 : static struct fb_videomode *fb_create_modedb(unsigned char *edid, int *dbsize)
597 : {
598 0 : struct fb_videomode *mode, *m;
599 0 : unsigned char *block;
600 0 : int num = 0, i, first = 1;
601 0 :
602 0 : mode = kzalloc(50 * sizeof(struct fb_videomode), GFP_KERNEL);
603 0 : if (mode == NULL)
604 0 : return NULL;
605 0 :
606 0 : if (edid == NULL || !edid_checksum(edid) ||
607 0 : !edid_check_header(edid)) {
608 0 : kfree(mode);
609 0 : return NULL;
610 0 : }
611 :
612 0 : *dbsize = 0;
613 :
614 : DPRINTK(" Detailed Timings\n");
615 0 : block = edid + DETAILED_TIMING_DESCRIPTIONS_START;
616 0 : for (i = 0; i < 4; i++, block+= DETAILED_TIMING_DESCRIPTION_SIZE) {
617 0 : if (!(block[0] == 0x00 && block[1] == 0x00)) {
618 0 : get_detailed_timing(block, &mode[num]);
619 0 : if (first) {
620 0 : mode[num].flag |= FB_MODE_IS_FIRST;
621 0 : first = 0;
622 : }
623 0 : num++;
624 : }
625 : }
626 :
627 : DPRINTK(" Supported VESA Modes\n");
628 0 : block = edid + ESTABLISHED_TIMING_1;
629 0 : num += get_est_timing(block, &mode[num]);
630 :
631 : DPRINTK(" Standard Timings\n");
632 0 : block = edid + STD_TIMING_DESCRIPTIONS_START;
633 0 : for (i = 0; i < STD_TIMING; i++, block += STD_TIMING_DESCRIPTION_SIZE)
634 0 : num += get_std_timing(block, &mode[num]);
635 0 :
636 0 : block = edid + DETAILED_TIMING_DESCRIPTIONS_START;
637 0 : for (i = 0; i < 4; i++, block+= DETAILED_TIMING_DESCRIPTION_SIZE) {
638 0 : if (block[0] == 0x00 && block[1] == 0x00 && block[3] == 0xfa)
639 0 : num += get_dst_timing(block + 5, &mode[num]);
640 : }
641 :
642 : /* Yikes, EDID data is totally useless */
643 0 : if (!num) {
644 0 : kfree(mode);
645 0 : return NULL;
646 : }
647 :
648 0 : *dbsize = num;
649 0 : m = kmalloc(num * sizeof(struct fb_videomode), GFP_KERNEL);
650 0 : if (!m)
651 0 : return mode;
652 0 : memmove(m, mode, num * sizeof(struct fb_videomode));
653 0 : kfree(mode);
654 0 : return m;
655 : }
656 :
657 : /**
658 : * fb_destroy_modedb - destroys mode database
659 : * @modedb: mode database to destroy
660 : *
661 : * DESCRIPTION:
662 : * Destroy mode database created by fb_create_modedb
663 : */
664 : void fb_destroy_modedb(struct fb_videomode *modedb)
665 : {
666 0 : kfree(modedb);
667 0 : }
668 :
669 : static int fb_get_monitor_limits(unsigned char *edid, struct fb_monspecs *specs)
670 : {
671 0 : int i, retval = 1;
672 0 : unsigned char *block;
673 0 :
674 0 : block = edid + DETAILED_TIMING_DESCRIPTIONS_START;
675 0 :
676 0 : DPRINTK(" Monitor Operating Limits: ");
677 0 :
678 0 : for (i = 0; i < 4; i++, block += DETAILED_TIMING_DESCRIPTION_SIZE) {
679 0 : if (edid_is_limits_block(block)) {
680 0 : specs->hfmin = H_MIN_RATE * 1000;
681 0 : specs->hfmax = H_MAX_RATE * 1000;
682 0 : specs->vfmin = V_MIN_RATE;
683 0 : specs->vfmax = V_MAX_RATE;
684 0 : specs->dclkmax = MAX_PIXEL_CLOCK * 1000000;
685 0 : specs->gtf = (GTF_SUPPORT) ? 1 : 0;
686 0 : retval = 0;
687 : DPRINTK("From EDID\n");
688 0 : break;
689 : }
690 : }
691 :
692 : /* estimate monitor limits based on modes supported */
693 0 : if (retval) {
694 : struct fb_videomode *modes, *mode;
695 : int num_modes, hz, hscan, pixclock;
696 : int vtotal, htotal;
697 :
698 0 : modes = fb_create_modedb(edid, &num_modes);
699 0 : if (!modes) {
700 : DPRINTK("None Available\n");
701 0 : return 1;
702 : }
703 :
704 0 : retval = 0;
705 0 : for (i = 0; i < num_modes; i++) {
706 0 : mode = &modes[i];
707 0 : pixclock = PICOS2KHZ(modes[i].pixclock) * 1000;
708 0 : htotal = mode->xres + mode->right_margin + mode->hsync_len
709 : + mode->left_margin;
710 0 : vtotal = mode->yres + mode->lower_margin + mode->vsync_len
711 : + mode->upper_margin;
712 :
713 0 : if (mode->vmode & FB_VMODE_INTERLACED)
714 0 : vtotal /= 2;
715 :
716 0 : if (mode->vmode & FB_VMODE_DOUBLE)
717 0 : vtotal *= 2;
718 :
719 0 : hscan = (pixclock + htotal / 2) / htotal;
720 0 : hscan = (hscan + 500) / 1000 * 1000;
721 0 : hz = (hscan + vtotal / 2) / vtotal;
722 :
723 0 : if (specs->dclkmax == 0 || specs->dclkmax < pixclock)
724 0 : specs->dclkmax = pixclock;
725 :
726 0 : if (specs->dclkmin == 0 || specs->dclkmin > pixclock)
727 0 : specs->dclkmin = pixclock;
728 :
729 0 : if (specs->hfmax == 0 || specs->hfmax < hscan)
730 0 : specs->hfmax = hscan;
731 :
732 0 : if (specs->hfmin == 0 || specs->hfmin > hscan)
733 0 : specs->hfmin = hscan;
734 :
735 0 : if (specs->vfmax == 0 || specs->vfmax < hz)
736 0 : specs->vfmax = hz;
737 :
738 0 : if (specs->vfmin == 0 || specs->vfmin > hz)
739 0 : specs->vfmin = hz;
740 : }
741 : DPRINTK("Extrapolated\n");
742 0 : fb_destroy_modedb(modes);
743 : }
744 : DPRINTK(" H: %d-%dKHz V: %d-%dHz DCLK: %dMHz\n",
745 : specs->hfmin/1000, specs->hfmax/1000, specs->vfmin,
746 : specs->vfmax, specs->dclkmax/1000000);
747 0 : return retval;
748 : }
749 :
750 : static void get_monspecs(unsigned char *edid, struct fb_monspecs *specs)
751 : {
752 0 : unsigned char c, *block;
753 0 :
754 0 : block = edid + EDID_STRUCT_DISPLAY;
755 :
756 0 : fb_get_monitor_limits(edid, specs);
757 :
758 0 : c = block[0] & 0x80;
759 0 : specs->input = 0;
760 0 : if (c) {
761 0 : specs->input |= FB_DISP_DDI;
762 : DPRINTK(" Digital Display Input");
763 : } else {
764 : DPRINTK(" Analog Display Input: Input Voltage - ");
765 0 : switch ((block[0] & 0x60) >> 5) {
766 0 : case 0:
767 : DPRINTK("0.700V/0.300V");
768 0 : specs->input |= FB_DISP_ANA_700_300;
769 0 : break;
770 0 : case 1:
771 : DPRINTK("0.714V/0.286V");
772 0 : specs->input |= FB_DISP_ANA_714_286;
773 0 : break;
774 0 : case 2:
775 : DPRINTK("1.000V/0.400V");
776 0 : specs->input |= FB_DISP_ANA_1000_400;
777 0 : break;
778 0 : case 3:
779 : DPRINTK("0.700V/0.000V");
780 0 : specs->input |= FB_DISP_ANA_700_000;
781 0 : break;
782 0 : }
783 : }
784 0 : DPRINTK("\n Sync: ");
785 0 : c = block[0] & 0x10;
786 : if (c)
787 : DPRINTK(" Configurable signal level\n");
788 0 : c = block[0] & 0x0f;
789 0 : specs->signal = 0;
790 0 : if (c & 0x10) {
791 : DPRINTK("Blank to Blank ");
792 0 : specs->signal |= FB_SIGNAL_BLANK_BLANK;
793 : }
794 0 : if (c & 0x08) {
795 : DPRINTK("Separate ");
796 0 : specs->signal |= FB_SIGNAL_SEPARATE;
797 : }
798 0 : if (c & 0x04) {
799 : DPRINTK("Composite ");
800 0 : specs->signal |= FB_SIGNAL_COMPOSITE;
801 : }
802 0 : if (c & 0x02) {
803 : DPRINTK("Sync on Green ");
804 0 : specs->signal |= FB_SIGNAL_SYNC_ON_GREEN;
805 : }
806 0 : if (c & 0x01) {
807 : DPRINTK("Serration on ");
808 0 : specs->signal |= FB_SIGNAL_SERRATION_ON;
809 : }
810 : DPRINTK("\n");
811 0 : specs->max_x = block[1];
812 0 : specs->max_y = block[2];
813 : DPRINTK(" Max H-size in cm: ");
814 : if (specs->max_x)
815 : DPRINTK("%d\n", specs->max_x);
816 : else
817 : DPRINTK("variable\n");
818 : DPRINTK(" Max V-size in cm: ");
819 : if (specs->max_y)
820 : DPRINTK("%d\n", specs->max_y);
821 : else
822 : DPRINTK("variable\n");
823 :
824 0 : c = block[3];
825 0 : specs->gamma = c+100;
826 : DPRINTK(" Gamma: ");
827 : DPRINTK("%d.%d\n", specs->gamma/100, specs->gamma % 100);
828 :
829 0 : get_dpms_capabilities(block[4], specs);
830 :
831 : switch ((block[4] & 0x18) >> 3) {
832 0 : case 0:
833 : DPRINTK(" Monochrome/Grayscale\n");
834 0 : specs->input |= FB_DISP_MONO;
835 0 : break;
836 0 : case 1:
837 : DPRINTK(" RGB Color Display\n");
838 0 : specs->input |= FB_DISP_RGB;
839 0 : break;
840 0 : case 2:
841 : DPRINTK(" Non-RGB Multicolor Display\n");
842 0 : specs->input |= FB_DISP_MULTI;
843 0 : break;
844 0 : default:
845 0 : DPRINTK(" Unknown\n");
846 0 : specs->input |= FB_DISP_UNKNOWN;
847 0 : break;
848 : }
849 :
850 0 : get_chroma(block, specs);
851 :
852 0 : specs->misc = 0;
853 0 : c = block[4] & 0x7;
854 0 : if (c & 0x04) {
855 : DPRINTK(" Default color format is primary\n");
856 0 : specs->misc |= FB_MISC_PRIM_COLOR;
857 : }
858 0 : if (c & 0x02) {
859 : DPRINTK(" First DETAILED Timing is preferred\n");
860 0 : specs->misc |= FB_MISC_1ST_DETAIL;
861 : }
862 0 : if (c & 0x01) {
863 0 : printk(" Display is GTF capable\n");
864 0 : specs->gtf = 1;
865 : }
866 0 : }
867 :
868 : int fb_parse_edid(unsigned char *edid, struct fb_var_screeninfo *var)
869 : {
870 0 : int i;
871 0 : unsigned char *block;
872 0 :
873 0 : if (edid == NULL || var == NULL)
874 0 : return 1;
875 0 :
876 0 : if (!(edid_checksum(edid)))
877 0 : return 1;
878 :
879 0 : if (!(edid_check_header(edid)))
880 0 : return 1;
881 :
882 0 : block = edid + DETAILED_TIMING_DESCRIPTIONS_START;
883 :
884 0 : for (i = 0; i < 4; i++, block += DETAILED_TIMING_DESCRIPTION_SIZE) {
885 0 : if (edid_is_timing_block(block)) {
886 0 : var->xres = var->xres_virtual = H_ACTIVE;
887 0 : var->yres = var->yres_virtual = V_ACTIVE;
888 0 : var->height = var->width = 0;
889 0 : var->right_margin = H_SYNC_OFFSET;
890 0 : var->left_margin = (H_ACTIVE + H_BLANKING) -
891 : (H_ACTIVE + H_SYNC_OFFSET + H_SYNC_WIDTH);
892 0 : var->upper_margin = V_BLANKING - V_SYNC_OFFSET -
893 : V_SYNC_WIDTH;
894 0 : var->lower_margin = V_SYNC_OFFSET;
895 0 : var->hsync_len = H_SYNC_WIDTH;
896 0 : var->vsync_len = V_SYNC_WIDTH;
897 0 : var->pixclock = PIXEL_CLOCK;
898 0 : var->pixclock /= 1000;
899 0 : var->pixclock = KHZ2PICOS(var->pixclock);
900 :
901 0 : if (HSYNC_POSITIVE)
902 0 : var->sync |= FB_SYNC_HOR_HIGH_ACT;
903 0 : if (VSYNC_POSITIVE)
904 0 : var->sync |= FB_SYNC_VERT_HIGH_ACT;
905 0 : return 0;
906 : }
907 : }
908 0 : return 1;
909 : }
910 :
911 : void fb_edid_to_monspecs(unsigned char *edid, struct fb_monspecs *specs)
912 : {
913 0 : unsigned char *block;
914 0 : int i, found = 0;
915 0 :
916 0 : if (edid == NULL)
917 0 : return;
918 0 :
919 0 : if (!(edid_checksum(edid)))
920 0 : return;
921 :
922 0 : if (!(edid_check_header(edid)))
923 0 : return;
924 :
925 0 : memset(specs, 0, sizeof(struct fb_monspecs));
926 :
927 0 : specs->version = edid[EDID_STRUCT_VERSION];
928 0 : specs->revision = edid[EDID_STRUCT_REVISION];
929 :
930 : DPRINTK("========================================\n");
931 : DPRINTK("Display Information (EDID)\n");
932 : DPRINTK("========================================\n");
933 : DPRINTK(" EDID Version %d.%d\n", (int) specs->version,
934 : (int) specs->revision);
935 :
936 0 : parse_vendor_block(edid + ID_MANUFACTURER_NAME, specs);
937 :
938 0 : block = edid + DETAILED_TIMING_DESCRIPTIONS_START;
939 0 : for (i = 0; i < 4; i++, block += DETAILED_TIMING_DESCRIPTION_SIZE) {
940 0 : if (edid_is_serial_block(block)) {
941 0 : copy_string(block, specs->serial_no);
942 : DPRINTK(" Serial Number: %s\n", specs->serial_no);
943 0 : } else if (edid_is_ascii_block(block)) {
944 0 : copy_string(block, specs->ascii);
945 : DPRINTK(" ASCII Block: %s\n", specs->ascii);
946 0 : } else if (edid_is_monitor_block(block)) {
947 0 : copy_string(block, specs->monitor);
948 : DPRINTK(" Monitor Name: %s\n", specs->monitor);
949 : }
950 : }
951 :
952 : DPRINTK(" Display Characteristics:\n");
953 0 : get_monspecs(edid, specs);
954 :
955 0 : specs->modedb = fb_create_modedb(edid, &specs->modedb_len);
956 :
957 : /*
958 : * Workaround for buggy EDIDs that sets that the first
959 : * detailed timing is preferred but has not detailed
960 : * timing specified
961 : */
962 0 : for (i = 0; i < specs->modedb_len; i++) {
963 0 : if (specs->modedb[i].flag & FB_MODE_IS_DETAILED) {
964 0 : found = 1;
965 0 : break;
966 : }
967 : }
968 0 :
969 0 : if (!found)
970 0 : specs->misc &= ~FB_MISC_1ST_DETAIL;
971 0 :
972 1 : DPRINTK("========================================\n");
973 : }
974 :
975 : /*
976 : * VESA Generalized Timing Formula (GTF)
977 : */
978 :
979 : #define FLYBACK 550
980 : #define V_FRONTPORCH 1
981 : #define H_OFFSET 40
982 : #define H_SCALEFACTOR 20
983 : #define H_BLANKSCALE 128
984 : #define H_GRADIENT 600
985 : #define C_VAL 30
986 : #define M_VAL 300
987 :
988 : struct __fb_timings {
989 : u32 dclk;
990 : u32 hfreq;
991 : u32 vfreq;
992 : u32 hactive;
993 : u32 vactive;
994 : u32 hblank;
995 : u32 vblank;
996 : u32 htotal;
997 : u32 vtotal;
998 : };
999 :
1000 : /**
1001 : * fb_get_vblank - get vertical blank time
1002 : * @hfreq: horizontal freq
1003 : *
1004 : * DESCRIPTION:
1005 : * vblank = right_margin + vsync_len + left_margin
1006 : *
1007 : * given: right_margin = 1 (V_FRONTPORCH)
1008 : * vsync_len = 3
1009 : * flyback = 550
1010 : *
1011 : * flyback * hfreq
1012 : * left_margin = --------------- - vsync_len
1013 : * 1000000
1014 : */
1015 : static u32 fb_get_vblank(u32 hfreq)
1016 : {
1017 0 : u32 vblank;
1018 :
1019 0 : vblank = (hfreq * FLYBACK)/1000;
1020 0 : vblank = (vblank + 500)/1000;
1021 0 : return (vblank + V_FRONTPORCH);
1022 : }
1023 :
1024 : /**
1025 : * fb_get_hblank_by_freq - get horizontal blank time given hfreq
1026 : * @hfreq: horizontal freq
1027 : * @xres: horizontal resolution in pixels
1028 : *
1029 : * DESCRIPTION:
1030 : *
1031 : * xres * duty_cycle
1032 : * hblank = ------------------
1033 : * 100 - duty_cycle
1034 : *
1035 : * duty cycle = percent of htotal assigned to inactive display
1036 : * duty cycle = C - (M/Hfreq)
1037 : *
1038 : * where: C = ((offset - scale factor) * blank_scale)
1039 : * -------------------------------------- + scale factor
1040 : * 256
1041 : * M = blank_scale * gradient
1042 : *
1043 : */
1044 : static u32 fb_get_hblank_by_hfreq(u32 hfreq, u32 xres)
1045 : {
1046 0 : u32 c_val, m_val, duty_cycle, hblank;
1047 0 :
1048 0 : c_val = (((H_OFFSET - H_SCALEFACTOR) * H_BLANKSCALE)/256 +
1049 0 : H_SCALEFACTOR) * 1000;
1050 0 : m_val = (H_BLANKSCALE * H_GRADIENT)/256;
1051 0 : m_val = (m_val * 1000000)/hfreq;
1052 0 : duty_cycle = c_val - m_val;
1053 0 : hblank = (xres * duty_cycle)/(100000 - duty_cycle);
1054 0 : return (hblank);
1055 : }
1056 :
1057 : /**
1058 : * fb_get_hblank_by_dclk - get horizontal blank time given pixelclock
1059 : * @dclk: pixelclock in Hz
1060 : * @xres: horizontal resolution in pixels
1061 : *
1062 : * DESCRIPTION:
1063 : *
1064 : * xres * duty_cycle
1065 : * hblank = ------------------
1066 : * 100 - duty_cycle
1067 : *
1068 : * duty cycle = percent of htotal assigned to inactive display
1069 : * duty cycle = C - (M * h_period)
1070 : *
1071 : * where: h_period = SQRT(100 - C + (0.4 * xres * M)/dclk) + C - 100
1072 : * -----------------------------------------------
1073 : * 2 * M
1074 : * M = 300;
1075 : * C = 30;
1076 :
1077 : */
1078 : static u32 fb_get_hblank_by_dclk(u32 dclk, u32 xres)
1079 : {
1080 0 : u32 duty_cycle, h_period, hblank;
1081 0 :
1082 0 : dclk /= 1000;
1083 0 : h_period = 100 - C_VAL;
1084 0 : h_period *= h_period;
1085 0 : h_period += (M_VAL * xres * 2 * 1000)/(5 * dclk);
1086 0 : h_period *= 10000;
1087 :
1088 0 : h_period = int_sqrt(h_period);
1089 0 : h_period -= (100 - C_VAL) * 100;
1090 0 : h_period *= 1000;
1091 0 : h_period /= 2 * M_VAL;
1092 :
1093 0 : duty_cycle = C_VAL * 1000 - (M_VAL * h_period)/100;
1094 0 : hblank = (xres * duty_cycle)/(100000 - duty_cycle) + 8;
1095 0 : hblank &= ~15;
1096 0 : return (hblank);
1097 : }
1098 :
1099 : /**
1100 : * fb_get_hfreq - estimate hsync
1101 : * @vfreq: vertical refresh rate
1102 : * @yres: vertical resolution
1103 : *
1104 : * DESCRIPTION:
1105 : *
1106 : * (yres + front_port) * vfreq * 1000000
1107 : * hfreq = -------------------------------------
1108 : * (1000000 - (vfreq * FLYBACK)
1109 : *
1110 : */
1111 :
1112 : static u32 fb_get_hfreq(u32 vfreq, u32 yres)
1113 : {
1114 0 : u32 divisor, hfreq;
1115 0 :
1116 0 : divisor = (1000000 - (vfreq * FLYBACK))/1000;
1117 0 : hfreq = (yres + V_FRONTPORCH) * vfreq * 1000;
1118 0 : return (hfreq/divisor);
1119 : }
1120 :
1121 : static void fb_timings_vfreq(struct __fb_timings *timings)
1122 : {
1123 0 : timings->hfreq = fb_get_hfreq(timings->vfreq, timings->vactive);
1124 0 : timings->vblank = fb_get_vblank(timings->hfreq);
1125 0 : timings->vtotal = timings->vactive + timings->vblank;
1126 0 : timings->hblank = fb_get_hblank_by_hfreq(timings->hfreq,
1127 : timings->hactive);
1128 0 : timings->htotal = timings->hactive + timings->hblank;
1129 0 : timings->dclk = timings->htotal * timings->hfreq;
1130 0 : }
1131 :
1132 : static void fb_timings_hfreq(struct __fb_timings *timings)
1133 : {
1134 0 : timings->vblank = fb_get_vblank(timings->hfreq);
1135 0 : timings->vtotal = timings->vactive + timings->vblank;
1136 0 : timings->vfreq = timings->hfreq/timings->vtotal;
1137 0 : timings->hblank = fb_get_hblank_by_hfreq(timings->hfreq,
1138 : timings->hactive);
1139 0 : timings->htotal = timings->hactive + timings->hblank;
1140 0 : timings->dclk = timings->htotal * timings->hfreq;
1141 0 : }
1142 :
1143 : static void fb_timings_dclk(struct __fb_timings *timings)
1144 : {
1145 0 : timings->hblank = fb_get_hblank_by_dclk(timings->dclk,
1146 : timings->hactive);
1147 0 : timings->htotal = timings->hactive + timings->hblank;
1148 0 : timings->hfreq = timings->dclk/timings->htotal;
1149 0 : timings->vblank = fb_get_vblank(timings->hfreq);
1150 0 : timings->vtotal = timings->vactive + timings->vblank;
1151 0 : timings->vfreq = timings->hfreq/timings->vtotal;
1152 0 : }
1153 :
1154 : /*
1155 : * fb_get_mode - calculates video mode using VESA GTF
1156 : * @flags: if: 0 - maximize vertical refresh rate
1157 : * 1 - vrefresh-driven calculation;
1158 : * 2 - hscan-driven calculation;
1159 : * 3 - pixelclock-driven calculation;
1160 : * @val: depending on @flags, ignored, vrefresh, hsync or pixelclock
1161 : * @var: pointer to fb_var_screeninfo
1162 : * @info: pointer to fb_info
1163 : *
1164 : * DESCRIPTION:
1165 : * Calculates video mode based on monitor specs using VESA GTF.
1166 : * The GTF is best for VESA GTF compliant monitors but is
1167 : * specifically formulated to work for older monitors as well.
1168 : *
1169 : * If @flag==0, the function will attempt to maximize the
1170 : * refresh rate. Otherwise, it will calculate timings based on
1171 : * the flag and accompanying value.
1172 : *
1173 : * If FB_IGNOREMON bit is set in @flags, monitor specs will be
1174 : * ignored and @var will be filled with the calculated timings.
1175 : *
1176 : * All calculations are based on the VESA GTF Spreadsheet
1177 : * available at VESA's public ftp (http://www.vesa.org).
1178 : *
1179 : * NOTES:
1180 : * The timings generated by the GTF will be different from VESA
1181 : * DMT. It might be a good idea to keep a table of standard
1182 : * VESA modes as well. The GTF may also not work for some displays,
1183 : * such as, and especially, analog TV.
1184 : *
1185 : * REQUIRES:
1186 : * A valid info->monspecs, otherwise 'safe numbers' will be used.
1187 : */
1188 : int fb_get_mode(int flags, u32 val, struct fb_var_screeninfo *var, struct fb_info *info)
1189 : {
1190 0 : struct __fb_timings *timings;
1191 0 : u32 interlace = 1, dscan = 1;
1192 0 : u32 hfmin, hfmax, vfmin, vfmax, dclkmin, dclkmax, err = 0;
1193 0 :
1194 0 :
1195 0 : timings = kzalloc(sizeof(struct __fb_timings), GFP_KERNEL);
1196 0 :
1197 0 : if (!timings)
1198 0 : return -ENOMEM;
1199 0 :
1200 0 : /*
1201 : * If monspecs are invalid, use values that are enough
1202 : * for 640x480@60
1203 : */
1204 0 : if (!info || !info->monspecs.hfmax || !info->monspecs.vfmax ||
1205 : !info->monspecs.dclkmax ||
1206 : info->monspecs.hfmax < info->monspecs.hfmin ||
1207 : info->monspecs.vfmax < info->monspecs.vfmin ||
1208 : info->monspecs.dclkmax < info->monspecs.dclkmin) {
1209 0 : hfmin = 29000; hfmax = 30000;
1210 0 : vfmin = 60; vfmax = 60;
1211 0 : dclkmin = 0; dclkmax = 25000000;
1212 : } else {
1213 0 : hfmin = info->monspecs.hfmin;
1214 0 : hfmax = info->monspecs.hfmax;
1215 0 : vfmin = info->monspecs.vfmin;
1216 0 : vfmax = info->monspecs.vfmax;
1217 0 : dclkmin = info->monspecs.dclkmin;
1218 0 : dclkmax = info->monspecs.dclkmax;
1219 : }
1220 :
1221 0 : timings->hactive = var->xres;
1222 0 : timings->vactive = var->yres;
1223 0 : if (var->vmode & FB_VMODE_INTERLACED) {
1224 0 : timings->vactive /= 2;
1225 0 : interlace = 2;
1226 : }
1227 0 : if (var->vmode & FB_VMODE_DOUBLE) {
1228 0 : timings->vactive *= 2;
1229 0 : dscan = 2;
1230 : }
1231 :
1232 : switch (flags & ~FB_IGNOREMON) {
1233 0 : case FB_MAXTIMINGS: /* maximize refresh rate */
1234 0 : timings->hfreq = hfmax;
1235 0 : fb_timings_hfreq(timings);
1236 0 : if (timings->vfreq > vfmax) {
1237 0 : timings->vfreq = vfmax;
1238 0 : fb_timings_vfreq(timings);
1239 : }
1240 0 : if (timings->dclk > dclkmax) {
1241 0 : timings->dclk = dclkmax;
1242 0 : fb_timings_dclk(timings);
1243 : }
1244 0 : break;
1245 0 : case FB_VSYNCTIMINGS: /* vrefresh driven */
1246 0 : timings->vfreq = val;
1247 0 : fb_timings_vfreq(timings);
1248 0 : break;
1249 0 : case FB_HSYNCTIMINGS: /* hsync driven */
1250 0 : timings->hfreq = val;
1251 0 : fb_timings_hfreq(timings);
1252 0 : break;
1253 0 : case FB_DCLKTIMINGS: /* pixelclock driven */
1254 0 : timings->dclk = PICOS2KHZ(val) * 1000;
1255 0 : fb_timings_dclk(timings);
1256 0 : break;
1257 0 : default:
1258 0 : err = -EINVAL;
1259 0 :
1260 : }
1261 0 :
1262 0 : if (err || (!(flags & FB_IGNOREMON) &&
1263 : (timings->vfreq < vfmin || timings->vfreq > vfmax ||
1264 : timings->hfreq < hfmin || timings->hfreq > hfmax ||
1265 : timings->dclk < dclkmin || timings->dclk > dclkmax))) {
1266 0 : err = -EINVAL;
1267 : } else {
1268 0 : var->pixclock = KHZ2PICOS(timings->dclk/1000);
1269 0 : var->hsync_len = (timings->htotal * 8)/100;
1270 0 : var->right_margin = (timings->hblank/2) - var->hsync_len;
1271 0 : var->left_margin = timings->hblank - var->right_margin -
1272 : var->hsync_len;
1273 0 : var->vsync_len = (3 * interlace)/dscan;
1274 0 : var->lower_margin = (1 * interlace)/dscan;
1275 0 : var->upper_margin = (timings->vblank * interlace)/dscan -
1276 : (var->vsync_len + var->lower_margin);
1277 : }
1278 :
1279 0 : kfree(timings);
1280 0 : return err;
1281 : }
1282 : #else
1283 : int fb_parse_edid(unsigned char *edid, struct fb_var_screeninfo *var)
1284 : {
1285 : return 1;
1286 : }
1287 : void fb_edid_to_monspecs(unsigned char *edid, struct fb_monspecs *specs)
1288 : {
1289 : specs = NULL;
1290 : }
1291 : void fb_destroy_modedb(struct fb_videomode *modedb)
1292 : {
1293 : }
1294 : int fb_get_mode(int flags, u32 val, struct fb_var_screeninfo *var,
1295 : struct fb_info *info)
1296 : {
1297 : return -EINVAL;
1298 : }
1299 : #endif /* CONFIG_FB_MODE_HELPERS */
1300 :
1301 : /*
1302 : * fb_validate_mode - validates var against monitor capabilities
1303 : * @var: pointer to fb_var_screeninfo
1304 : * @info: pointer to fb_info
1305 : *
1306 : * DESCRIPTION:
1307 : * Validates video mode against monitor capabilities specified in
1308 : * info->monspecs.
1309 : *
1310 : * REQUIRES:
1311 : * A valid info->monspecs.
1312 : */
1313 : int fb_validate_mode(const struct fb_var_screeninfo *var, struct fb_info *info)
1314 : {
1315 0 : u32 hfreq, vfreq, htotal, vtotal, pixclock;
1316 0 : u32 hfmin, hfmax, vfmin, vfmax, dclkmin, dclkmax;
1317 0 :
1318 0 : /*
1319 0 : * If monspecs are invalid, use values that are enough
1320 0 : * for 640x480@60
1321 0 : */
1322 0 : if (!info->monspecs.hfmax || !info->monspecs.vfmax ||
1323 0 : !info->monspecs.dclkmax ||
1324 0 : info->monspecs.hfmax < info->monspecs.hfmin ||
1325 0 : info->monspecs.vfmax < info->monspecs.vfmin ||
1326 : info->monspecs.dclkmax < info->monspecs.dclkmin) {
1327 0 : hfmin = 29000; hfmax = 30000;
1328 0 : vfmin = 60; vfmax = 60;
1329 0 : dclkmin = 0; dclkmax = 25000000;
1330 : } else {
1331 0 : hfmin = info->monspecs.hfmin;
1332 0 : hfmax = info->monspecs.hfmax;
1333 0 : vfmin = info->monspecs.vfmin;
1334 0 : vfmax = info->monspecs.vfmax;
1335 0 : dclkmin = info->monspecs.dclkmin;
1336 0 : dclkmax = info->monspecs.dclkmax;
1337 : }
1338 :
1339 0 : if (!var->pixclock)
1340 0 : return -EINVAL;
1341 0 : pixclock = PICOS2KHZ(var->pixclock) * 1000;
1342 :
1343 0 : htotal = var->xres + var->right_margin + var->hsync_len +
1344 : var->left_margin;
1345 0 : vtotal = var->yres + var->lower_margin + var->vsync_len +
1346 : var->upper_margin;
1347 :
1348 0 : if (var->vmode & FB_VMODE_INTERLACED)
1349 0 : vtotal /= 2;
1350 0 : if (var->vmode & FB_VMODE_DOUBLE)
1351 0 : vtotal *= 2;
1352 :
1353 0 : hfreq = pixclock/htotal;
1354 0 : hfreq = (hfreq + 500) / 1000 * 1000;
1355 :
1356 0 : vfreq = hfreq/vtotal;
1357 :
1358 0 : return (vfreq < vfmin || vfreq > vfmax ||
1359 : hfreq < hfmin || hfreq > hfmax ||
1360 : pixclock < dclkmin || pixclock > dclkmax) ?
1361 : -EINVAL : 0;
1362 : }
1363 :
1364 : #if defined(CONFIG_FIRMWARE_EDID) && defined(CONFIG_X86)
1365 :
1366 : /*
1367 : * We need to ensure that the EDID block is only returned for
1368 : * the primary graphics adapter.
1369 : */
1370 :
1371 : const unsigned char *fb_firmware_edid(struct device *device)
1372 : {
1373 : struct pci_dev *dev = NULL;
1374 : struct resource *res = NULL;
1375 : unsigned char *edid = NULL;
1376 :
1377 : if (device)
1378 : dev = to_pci_dev(device);
1379 :
1380 : if (dev)
1381 : res = &dev->resource[PCI_ROM_RESOURCE];
1382 :
1383 : if (res && res->flags & IORESOURCE_ROM_SHADOW)
1384 : edid = edid_info.dummy;
1385 :
1386 : return edid;
1387 : }
1388 : #else
1389 : const unsigned char *fb_firmware_edid(struct device *device)
1390 : {
1391 0 : return NULL;
1392 : }
1393 : #endif
1394 : EXPORT_SYMBOL(fb_firmware_edid);
1395 :
1396 : EXPORT_SYMBOL(fb_parse_edid);
1397 : EXPORT_SYMBOL(fb_edid_to_monspecs);
1398 : EXPORT_SYMBOL(fb_get_mode);
1399 : EXPORT_SYMBOL(fb_validate_mode);
1400 : EXPORT_SYMBOL(fb_destroy_modedb);
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