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