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MIPS: Yosemite, Emma: Fix off-by-two in arcs_cmdline buffer size check
[linux-2.6/linux-mips.git] / drivers / video / fbmon.c
blobcef65574db6c09bd906d3ab2eac8c235f208dedf
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 <linux/slab.h>
33 #include <video/edid.h>
34 #ifdef CONFIG_PPC_OF
35 #include <asm/prom.h>
36 #include <asm/pci-bridge.h>
37 #endif
38 #include "edid.h"
39
40 /*
41 * EDID parser
42 */
43
44 #undef DEBUG /* define this for verbose EDID parsing output */
45
46 #ifdef DEBUG
47 #define DPRINTK(fmt, args...) printk(fmt,## args)
48 #else
49 #define DPRINTK(fmt, args...)
50 #endif
51
52 #define FBMON_FIX_HEADER 1
53 #define FBMON_FIX_INPUT 2
54 #define FBMON_FIX_TIMINGS 3
55
56 #ifdef CONFIG_FB_MODE_HELPERS
57 struct broken_edid {
58 u8 manufacturer[4];
59 u32 model;
60 u32 fix;
61 };
62
63 static const struct broken_edid brokendb[] = {
64 /* DEC FR-PCXAV-YZ */
65 {
66 .manufacturer = "DEC",
67 .model = 0x073a,
68 .fix = FBMON_FIX_HEADER,
69 },
70 /* ViewSonic PF775a */
71 {
72 .manufacturer = "VSC",
73 .model = 0x5a44,
74 .fix = FBMON_FIX_INPUT,
75 },
76 /* Sharp UXGA? */
77 {
78 .manufacturer = "SHP",
79 .model = 0x138e,
80 .fix = FBMON_FIX_TIMINGS,
81 },
82 };
83
84 static const unsigned char edid_v1_header[] = { 0x00, 0xff, 0xff, 0xff,
85 0xff, 0xff, 0xff, 0x00
86 };
87
88 static void copy_string(unsigned char *c, unsigned char *s)
89 {
90 int i;
91 c = c + 5;
92 for (i = 0; (i < 13 && *c != 0x0A); i++)
93 *(s++) = *(c++);
94 *s = 0;
95 while (i-- && (*--s == 0x20)) *s = 0;
96 }
97
98 static int edid_is_serial_block(unsigned char *block)
99 {
100 if ((block[0] == 0x00) && (block[1] == 0x00) &&
101 (block[2] == 0x00) && (block[3] == 0xff) &&
102 (block[4] == 0x00))
103 return 1;
104 else
105 return 0;
106 }
107
108 static int edid_is_ascii_block(unsigned char *block)
109 {
110 if ((block[0] == 0x00) && (block[1] == 0x00) &&
111 (block[2] == 0x00) && (block[3] == 0xfe) &&
112 (block[4] == 0x00))
113 return 1;
114 else
115 return 0;
116 }
117
118 static int edid_is_limits_block(unsigned char *block)
119 {
120 if ((block[0] == 0x00) && (block[1] == 0x00) &&
121 (block[2] == 0x00) && (block[3] == 0xfd) &&
122 (block[4] == 0x00))
123 return 1;
124 else
125 return 0;
126 }
127
128 static int edid_is_monitor_block(unsigned char *block)
129 {
130 if ((block[0] == 0x00) && (block[1] == 0x00) &&
131 (block[2] == 0x00) && (block[3] == 0xfc) &&
132 (block[4] == 0x00))
133 return 1;
134 else
135 return 0;
136 }
137
138 static int edid_is_timing_block(unsigned char *block)
139 {
140 if ((block[0] != 0x00) || (block[1] != 0x00) ||
141 (block[2] != 0x00) || (block[4] != 0x00))
142 return 1;
143 else
144 return 0;
145 }
146
147 static int check_edid(unsigned char *edid)
148 {
149 unsigned char *block = edid + ID_MANUFACTURER_NAME, manufacturer[4];
150 unsigned char *b;
151 u32 model;
152 int i, fix = 0, ret = 0;
153
154 manufacturer[0] = ((block[0] & 0x7c) >> 2) + '@';
155 manufacturer[1] = ((block[0] & 0x03) << 3) +
156 ((block[1] & 0xe0) >> 5) + '@';
157 manufacturer[2] = (block[1] & 0x1f) + '@';
158 manufacturer[3] = 0;
159 model = block[2] + (block[3] << 8);
160
161 for (i = 0; i < ARRAY_SIZE(brokendb); i++) {
162 if (!strncmp(manufacturer, brokendb[i].manufacturer, 4) &&
163 brokendb[i].model == model) {
164 fix = brokendb[i].fix;
165 break;
166 }
167 }
168
169 switch (fix) {
170 case FBMON_FIX_HEADER:
171 for (i = 0; i < 8; i++) {
172 if (edid[i] != edid_v1_header[i]) {
173 ret = fix;
174 break;
175 }
176 }
177 break;
178 case FBMON_FIX_INPUT:
179 b = edid + EDID_STRUCT_DISPLAY;
180 /* Only if display is GTF capable will
181 the input type be reset to analog */
182 if (b[4] & 0x01 && b[0] & 0x80)
183 ret = fix;
184 break;
185 case FBMON_FIX_TIMINGS:
186 b = edid + DETAILED_TIMING_DESCRIPTIONS_START;
187 ret = fix;
188
189 for (i = 0; i < 4; i++) {
190 if (edid_is_limits_block(b)) {
191 ret = 0;
192 break;
193 }
194
195 b += DETAILED_TIMING_DESCRIPTION_SIZE;
196 }
197
198 break;
199 }
200
201 if (ret)
202 printk("fbmon: The EDID Block of "
203 "Manufacturer: %s Model: 0x%x is known to "
204 "be broken,\n", manufacturer, model);
205
206 return ret;
207 }
208
209 static void fix_edid(unsigned char *edid, int fix)
210 {
211 int i;
212 unsigned char *b, csum = 0;
213
214 switch (fix) {
215 case FBMON_FIX_HEADER:
216 printk("fbmon: trying a header reconstruct\n");
217 memcpy(edid, edid_v1_header, 8);
218 break;
219 case FBMON_FIX_INPUT:
220 printk("fbmon: trying to fix input type\n");
221 b = edid + EDID_STRUCT_DISPLAY;
222 b[0] &= ~0x80;
223 edid[127] += 0x80;
224 break;
225 case FBMON_FIX_TIMINGS:
226 printk("fbmon: trying to fix monitor timings\n");
227 b = edid + DETAILED_TIMING_DESCRIPTIONS_START;
228 for (i = 0; i < 4; i++) {
229 if (!(edid_is_serial_block(b) ||
230 edid_is_ascii_block(b) ||
231 edid_is_monitor_block(b) ||
232 edid_is_timing_block(b))) {
233 b[0] = 0x00;
234 b[1] = 0x00;
235 b[2] = 0x00;
236 b[3] = 0xfd;
237 b[4] = 0x00;
238 b[5] = 60; /* vfmin */
239 b[6] = 60; /* vfmax */
240 b[7] = 30; /* hfmin */
241 b[8] = 75; /* hfmax */
242 b[9] = 17; /* pixclock - 170 MHz*/
243 b[10] = 0; /* GTF */
244 break;
245 }
246
247 b += DETAILED_TIMING_DESCRIPTION_SIZE;
248 }
249
250 for (i = 0; i < EDID_LENGTH - 1; i++)
251 csum += edid[i];
252
253 edid[127] = 256 - csum;
254 break;
255 }
256 }
257
258 static int edid_checksum(unsigned char *edid)
259 {
260 unsigned char csum = 0, all_null = 0;
261 int i, err = 0, fix = check_edid(edid);
262
263 if (fix)
264 fix_edid(edid, fix);
265
266 for (i = 0; i < EDID_LENGTH; i++) {
267 csum += edid[i];
268 all_null |= edid[i];
269 }
270
271 if (csum == 0x00 && all_null) {
272 /* checksum passed, everything's good */
273 err = 1;
274 }
275
276 return err;
277 }
278
279 static int edid_check_header(unsigned char *edid)
280 {
281 int i, err = 1, fix = check_edid(edid);
282
283 if (fix)
284 fix_edid(edid, fix);
285
286 for (i = 0; i < 8; i++) {
287 if (edid[i] != edid_v1_header[i])
288 err = 0;
289 }
290
291 return err;
292 }
293
294 static void parse_vendor_block(unsigned char *block, struct fb_monspecs *specs)
295 {
296 specs->manufacturer[0] = ((block[0] & 0x7c) >> 2) + '@';
297 specs->manufacturer[1] = ((block[0] & 0x03) << 3) +
298 ((block[1] & 0xe0) >> 5) + '@';
299 specs->manufacturer[2] = (block[1] & 0x1f) + '@';
300 specs->manufacturer[3] = 0;
301 specs->model = block[2] + (block[3] << 8);
302 specs->serial = block[4] + (block[5] << 8) +
303 (block[6] << 16) + (block[7] << 24);
304 specs->year = block[9] + 1990;
305 specs->week = block[8];
306 DPRINTK(" Manufacturer: %s\n", specs->manufacturer);
307 DPRINTK(" Model: %x\n", specs->model);
308 DPRINTK(" Serial#: %u\n", specs->serial);
309 DPRINTK(" Year: %u Week %u\n", specs->year, specs->week);
310 }
311
312 static void get_dpms_capabilities(unsigned char flags,
313 struct fb_monspecs *specs)
314 {
315 specs->dpms = 0;
316 if (flags & DPMS_ACTIVE_OFF)
317 specs->dpms |= FB_DPMS_ACTIVE_OFF;
318 if (flags & DPMS_SUSPEND)
319 specs->dpms |= FB_DPMS_SUSPEND;
320 if (flags & DPMS_STANDBY)
321 specs->dpms |= FB_DPMS_STANDBY;
322 DPRINTK(" DPMS: Active %s, Suspend %s, Standby %s\n",
323 (flags & DPMS_ACTIVE_OFF) ? "yes" : "no",
324 (flags & DPMS_SUSPEND) ? "yes" : "no",
325 (flags & DPMS_STANDBY) ? "yes" : "no");
326 }
327
328 static void get_chroma(unsigned char *block, struct fb_monspecs *specs)
329 {
330 int tmp;
331
332 DPRINTK(" Chroma\n");
333 /* Chromaticity data */
334 tmp = ((block[5] & (3 << 6)) >> 6) | (block[0x7] << 2);
335 tmp *= 1000;
336 tmp += 512;
337 specs->chroma.redx = tmp/1024;
338 DPRINTK(" RedX: 0.%03d ", specs->chroma.redx);
339
340 tmp = ((block[5] & (3 << 4)) >> 4) | (block[0x8] << 2);
341 tmp *= 1000;
342 tmp += 512;
343 specs->chroma.redy = tmp/1024;
344 DPRINTK("RedY: 0.%03d\n", specs->chroma.redy);
345
346 tmp = ((block[5] & (3 << 2)) >> 2) | (block[0x9] << 2);
347 tmp *= 1000;
348 tmp += 512;
349 specs->chroma.greenx = tmp/1024;
350 DPRINTK(" GreenX: 0.%03d ", specs->chroma.greenx);
351
352 tmp = (block[5] & 3) | (block[0xa] << 2);
353 tmp *= 1000;
354 tmp += 512;
355 specs->chroma.greeny = tmp/1024;
356 DPRINTK("GreenY: 0.%03d\n", specs->chroma.greeny);
357
358 tmp = ((block[6] & (3 << 6)) >> 6) | (block[0xb] << 2);
359 tmp *= 1000;
360 tmp += 512;
361 specs->chroma.bluex = tmp/1024;
362 DPRINTK(" BlueX: 0.%03d ", specs->chroma.bluex);
363
364 tmp = ((block[6] & (3 << 4)) >> 4) | (block[0xc] << 2);
365 tmp *= 1000;
366 tmp += 512;
367 specs->chroma.bluey = tmp/1024;
368 DPRINTK("BlueY: 0.%03d\n", specs->chroma.bluey);
369
370 tmp = ((block[6] & (3 << 2)) >> 2) | (block[0xd] << 2);
371 tmp *= 1000;
372 tmp += 512;
373 specs->chroma.whitex = tmp/1024;
374 DPRINTK(" WhiteX: 0.%03d ", specs->chroma.whitex);
375
376 tmp = (block[6] & 3) | (block[0xe] << 2);
377 tmp *= 1000;
378 tmp += 512;
379 specs->chroma.whitey = tmp/1024;
380 DPRINTK("WhiteY: 0.%03d\n", specs->chroma.whitey);
381 }
382
383 static void calc_mode_timings(int xres, int yres, int refresh,
384 struct fb_videomode *mode)
385 {
386 struct fb_var_screeninfo *var;
387
388 var = kzalloc(sizeof(struct fb_var_screeninfo), GFP_KERNEL);
389
390 if (var) {
391 var->xres = xres;
392 var->yres = yres;
393 fb_get_mode(FB_VSYNCTIMINGS | FB_IGNOREMON,
394 refresh, var, NULL);
395 mode->xres = xres;
396 mode->yres = yres;
397 mode->pixclock = var->pixclock;
398 mode->refresh = refresh;
399 mode->left_margin = var->left_margin;
400 mode->right_margin = var->right_margin;
401 mode->upper_margin = var->upper_margin;
402 mode->lower_margin = var->lower_margin;
403 mode->hsync_len = var->hsync_len;
404 mode->vsync_len = var->vsync_len;
405 mode->vmode = 0;
406 mode->sync = 0;
407 kfree(var);
408 }
409 }
410
411 static int get_est_timing(unsigned char *block, struct fb_videomode *mode)
412 {
413 int num = 0;
414 unsigned char c;
415
416 c = block[0];
417 if (c&0x80) {
418 calc_mode_timings(720, 400, 70, &mode[num]);
419 mode[num++].flag = FB_MODE_IS_CALCULATED;
420 DPRINTK(" 720x400@70Hz\n");
421 }
422 if (c&0x40) {
423 calc_mode_timings(720, 400, 88, &mode[num]);
424 mode[num++].flag = FB_MODE_IS_CALCULATED;
425 DPRINTK(" 720x400@88Hz\n");
426 }
427 if (c&0x20) {
428 mode[num++] = vesa_modes[3];
429 DPRINTK(" 640x480@60Hz\n");
430 }
431 if (c&0x10) {
432 calc_mode_timings(640, 480, 67, &mode[num]);
433 mode[num++].flag = FB_MODE_IS_CALCULATED;
434 DPRINTK(" 640x480@67Hz\n");
435 }
436 if (c&0x08) {
437 mode[num++] = vesa_modes[4];
438 DPRINTK(" 640x480@72Hz\n");
439 }
440 if (c&0x04) {
441 mode[num++] = vesa_modes[5];
442 DPRINTK(" 640x480@75Hz\n");
443 }
444 if (c&0x02) {
445 mode[num++] = vesa_modes[7];
446 DPRINTK(" 800x600@56Hz\n");
447 }
448 if (c&0x01) {
449 mode[num++] = vesa_modes[8];
450 DPRINTK(" 800x600@60Hz\n");
451 }
452
453 c = block[1];
454 if (c&0x80) {
455 mode[num++] = vesa_modes[9];
456 DPRINTK(" 800x600@72Hz\n");
457 }
458 if (c&0x40) {
459 mode[num++] = vesa_modes[10];
460 DPRINTK(" 800x600@75Hz\n");
461 }
462 if (c&0x20) {
463 calc_mode_timings(832, 624, 75, &mode[num]);
464 mode[num++].flag = FB_MODE_IS_CALCULATED;
465 DPRINTK(" 832x624@75Hz\n");
466 }
467 if (c&0x10) {
468 mode[num++] = vesa_modes[12];
469 DPRINTK(" 1024x768@87Hz Interlaced\n");
470 }
471 if (c&0x08) {
472 mode[num++] = vesa_modes[13];
473 DPRINTK(" 1024x768@60Hz\n");
474 }
475 if (c&0x04) {
476 mode[num++] = vesa_modes[14];
477 DPRINTK(" 1024x768@70Hz\n");
478 }
479 if (c&0x02) {
480 mode[num++] = vesa_modes[15];
481 DPRINTK(" 1024x768@75Hz\n");
482 }
483 if (c&0x01) {
484 mode[num++] = vesa_modes[21];
485 DPRINTK(" 1280x1024@75Hz\n");
486 }
487 c = block[2];
488 if (c&0x80) {
489 mode[num++] = vesa_modes[17];
490 DPRINTK(" 1152x870@75Hz\n");
491 }
492 DPRINTK(" Manufacturer's mask: %x\n",c&0x7F);
493 return num;
494 }
495
496 static int get_std_timing(unsigned char *block, struct fb_videomode *mode,
497 int ver, int rev)
498 {
499 int xres, yres = 0, refresh, ratio, i;
500
501 xres = (block[0] + 31) * 8;
502 if (xres <= 256)
503 return 0;
504
505 ratio = (block[1] & 0xc0) >> 6;
506 switch (ratio) {
507 case 0:
508 /* in EDID 1.3 the meaning of 0 changed to 16:10 (prior 1:1) */
509 if (ver < 1 || (ver == 1 && rev < 3))
510 yres = xres;
511 else
512 yres = (xres * 10)/16;
513 break;
514 case 1:
515 yres = (xres * 3)/4;
516 break;
517 case 2:
518 yres = (xres * 4)/5;
519 break;
520 case 3:
521 yres = (xres * 9)/16;
522 break;
523 }
524 refresh = (block[1] & 0x3f) + 60;
525
526 DPRINTK(" %dx%d@%dHz\n", xres, yres, refresh);
527 for (i = 0; i < VESA_MODEDB_SIZE; i++) {
528 if (vesa_modes[i].xres == xres &&
529 vesa_modes[i].yres == yres &&
530 vesa_modes[i].refresh == refresh) {
531 *mode = vesa_modes[i];
532 mode->flag |= FB_MODE_IS_STANDARD;
533 return 1;
534 }
535 }
536 calc_mode_timings(xres, yres, refresh, mode);
537 return 1;
538 }
539
540 static int get_dst_timing(unsigned char *block,
541 struct fb_videomode *mode, int ver, int rev)
542 {
543 int j, num = 0;
544
545 for (j = 0; j < 6; j++, block += STD_TIMING_DESCRIPTION_SIZE)
546 num += get_std_timing(block, &mode[num], ver, rev);
547
548 return num;
549 }
550
551 static void get_detailed_timing(unsigned char *block,
552 struct fb_videomode *mode)
553 {
554 mode->xres = H_ACTIVE;
555 mode->yres = V_ACTIVE;
556 mode->pixclock = PIXEL_CLOCK;
557 mode->pixclock /= 1000;
558 mode->pixclock = KHZ2PICOS(mode->pixclock);
559 mode->right_margin = H_SYNC_OFFSET;
560 mode->left_margin = (H_ACTIVE + H_BLANKING) -
561 (H_ACTIVE + H_SYNC_OFFSET + H_SYNC_WIDTH);
562 mode->upper_margin = V_BLANKING - V_SYNC_OFFSET -
563 V_SYNC_WIDTH;
564 mode->lower_margin = V_SYNC_OFFSET;
565 mode->hsync_len = H_SYNC_WIDTH;
566 mode->vsync_len = V_SYNC_WIDTH;
567 if (HSYNC_POSITIVE)
568 mode->sync |= FB_SYNC_HOR_HIGH_ACT;
569 if (VSYNC_POSITIVE)
570 mode->sync |= FB_SYNC_VERT_HIGH_ACT;
571 mode->refresh = PIXEL_CLOCK/((H_ACTIVE + H_BLANKING) *
572 (V_ACTIVE + V_BLANKING));
573 if (INTERLACED) {
574 mode->yres *= 2;
575 mode->upper_margin *= 2;
576 mode->lower_margin *= 2;
577 mode->vsync_len *= 2;
578 mode->vmode |= FB_VMODE_INTERLACED;
579 }
580 mode->flag = FB_MODE_IS_DETAILED;
581
582 DPRINTK(" %d MHz ", PIXEL_CLOCK/1000000);
583 DPRINTK("%d %d %d %d ", H_ACTIVE, H_ACTIVE + H_SYNC_OFFSET,
584 H_ACTIVE + H_SYNC_OFFSET + H_SYNC_WIDTH, H_ACTIVE + H_BLANKING);
585 DPRINTK("%d %d %d %d ", V_ACTIVE, V_ACTIVE + V_SYNC_OFFSET,
586 V_ACTIVE + V_SYNC_OFFSET + V_SYNC_WIDTH, V_ACTIVE + V_BLANKING);
587 DPRINTK("%sHSync %sVSync\n\n", (HSYNC_POSITIVE) ? "+" : "-",
588 (VSYNC_POSITIVE) ? "+" : "-");
589 }
590
591 /**
592 * fb_create_modedb - create video mode database
593 * @edid: EDID data
594 * @dbsize: database size
595 *
596 * RETURNS: struct fb_videomode, @dbsize contains length of database
597 *
598 * DESCRIPTION:
599 * This function builds a mode database using the contents of the EDID
600 * data
601 */
602 static struct fb_videomode *fb_create_modedb(unsigned char *edid, int *dbsize)
603 {
604 struct fb_videomode *mode, *m;
605 unsigned char *block;
606 int num = 0, i, first = 1;
607 int ver, rev;
608
609 ver = edid[EDID_STRUCT_VERSION];
610 rev = edid[EDID_STRUCT_REVISION];
611
612 mode = kzalloc(50 * sizeof(struct fb_videomode), GFP_KERNEL);
613 if (mode == NULL)
614 return NULL;
615
616 if (edid == NULL || !edid_checksum(edid) ||
617 !edid_check_header(edid)) {
618 kfree(mode);
619 return NULL;
620 }
621
622 *dbsize = 0;
623
624 DPRINTK(" Detailed Timings\n");
625 block = edid + DETAILED_TIMING_DESCRIPTIONS_START;
626 for (i = 0; i < 4; i++, block+= DETAILED_TIMING_DESCRIPTION_SIZE) {
627 if (!(block[0] == 0x00 && block[1] == 0x00)) {
628 get_detailed_timing(block, &mode[num]);
629 if (first) {
630 mode[num].flag |= FB_MODE_IS_FIRST;
631 first = 0;
632 }
633 num++;
634 }
635 }
636
637 DPRINTK(" Supported VESA Modes\n");
638 block = edid + ESTABLISHED_TIMING_1;
639 num += get_est_timing(block, &mode[num]);
640
641 DPRINTK(" Standard Timings\n");
642 block = edid + STD_TIMING_DESCRIPTIONS_START;
643 for (i = 0; i < STD_TIMING; i++, block += STD_TIMING_DESCRIPTION_SIZE)
644 num += get_std_timing(block, &mode[num], ver, rev);
645
646 block = edid + DETAILED_TIMING_DESCRIPTIONS_START;
647 for (i = 0; i < 4; i++, block+= DETAILED_TIMING_DESCRIPTION_SIZE) {
648 if (block[0] == 0x00 && block[1] == 0x00 && block[3] == 0xfa)
649 num += get_dst_timing(block + 5, &mode[num], ver, rev);
650 }
651
652 /* Yikes, EDID data is totally useless */
653 if (!num) {
654 kfree(mode);
655 return NULL;
656 }
657
658 *dbsize = num;
659 m = kmalloc(num * sizeof(struct fb_videomode), GFP_KERNEL);
660 if (!m)
661 return mode;
662 memmove(m, mode, num * sizeof(struct fb_videomode));
663 kfree(mode);
664 return m;
665 }
666
667 /**
668 * fb_destroy_modedb - destroys mode database
669 * @modedb: mode database to destroy
670 *
671 * DESCRIPTION:
672 * Destroy mode database created by fb_create_modedb
673 */
674 void fb_destroy_modedb(struct fb_videomode *modedb)
675 {
676 kfree(modedb);
677 }
678
679 static int fb_get_monitor_limits(unsigned char *edid, struct fb_monspecs *specs)
680 {
681 int i, retval = 1;
682 unsigned char *block;
683
684 block = edid + DETAILED_TIMING_DESCRIPTIONS_START;
685
686 DPRINTK(" Monitor Operating Limits: ");
687
688 for (i = 0; i < 4; i++, block += DETAILED_TIMING_DESCRIPTION_SIZE) {
689 if (edid_is_limits_block(block)) {
690 specs->hfmin = H_MIN_RATE * 1000;
691 specs->hfmax = H_MAX_RATE * 1000;
692 specs->vfmin = V_MIN_RATE;
693 specs->vfmax = V_MAX_RATE;
694 specs->dclkmax = MAX_PIXEL_CLOCK * 1000000;
695 specs->gtf = (GTF_SUPPORT) ? 1 : 0;
696 retval = 0;
697 DPRINTK("From EDID\n");
698 break;
699 }
700 }
701
702 /* estimate monitor limits based on modes supported */
703 if (retval) {
704 struct fb_videomode *modes, *mode;
705 int num_modes, hz, hscan, pixclock;
706 int vtotal, htotal;
707
708 modes = fb_create_modedb(edid, &num_modes);
709 if (!modes) {
710 DPRINTK("None Available\n");
711 return 1;
712 }
713
714 retval = 0;
715 for (i = 0; i < num_modes; i++) {
716 mode = &modes[i];
717 pixclock = PICOS2KHZ(modes[i].pixclock) * 1000;
718 htotal = mode->xres + mode->right_margin + mode->hsync_len
719 + mode->left_margin;
720 vtotal = mode->yres + mode->lower_margin + mode->vsync_len
721 + mode->upper_margin;
722
723 if (mode->vmode & FB_VMODE_INTERLACED)
724 vtotal /= 2;
725
726 if (mode->vmode & FB_VMODE_DOUBLE)
727 vtotal *= 2;
728
729 hscan = (pixclock + htotal / 2) / htotal;
730 hscan = (hscan + 500) / 1000 * 1000;
731 hz = (hscan + vtotal / 2) / vtotal;
732
733 if (specs->dclkmax == 0 || specs->dclkmax < pixclock)
734 specs->dclkmax = pixclock;
735
736 if (specs->dclkmin == 0 || specs->dclkmin > pixclock)
737 specs->dclkmin = pixclock;
738
739 if (specs->hfmax == 0 || specs->hfmax < hscan)
740 specs->hfmax = hscan;
741
742 if (specs->hfmin == 0 || specs->hfmin > hscan)
743 specs->hfmin = hscan;
744
745 if (specs->vfmax == 0 || specs->vfmax < hz)
746 specs->vfmax = hz;
747
748 if (specs->vfmin == 0 || specs->vfmin > hz)
749 specs->vfmin = hz;
750 }
751 DPRINTK("Extrapolated\n");
752 fb_destroy_modedb(modes);
753 }
754 DPRINTK(" H: %d-%dKHz V: %d-%dHz DCLK: %dMHz\n",
755 specs->hfmin/1000, specs->hfmax/1000, specs->vfmin,
756 specs->vfmax, specs->dclkmax/1000000);
757 return retval;
758 }
759
760 static void get_monspecs(unsigned char *edid, struct fb_monspecs *specs)
761 {
762 unsigned char c, *block;
763
764 block = edid + EDID_STRUCT_DISPLAY;
765
766 fb_get_monitor_limits(edid, specs);
767
768 c = block[0] & 0x80;
769 specs->input = 0;
770 if (c) {
771 specs->input |= FB_DISP_DDI;
772 DPRINTK(" Digital Display Input");
773 } else {
774 DPRINTK(" Analog Display Input: Input Voltage - ");
775 switch ((block[0] & 0x60) >> 5) {
776 case 0:
777 DPRINTK("0.700V/0.300V");
778 specs->input |= FB_DISP_ANA_700_300;
779 break;
780 case 1:
781 DPRINTK("0.714V/0.286V");
782 specs->input |= FB_DISP_ANA_714_286;
783 break;
784 case 2:
785 DPRINTK("1.000V/0.400V");
786 specs->input |= FB_DISP_ANA_1000_400;
787 break;
788 case 3:
789 DPRINTK("0.700V/0.000V");
790 specs->input |= FB_DISP_ANA_700_000;
791 break;
792 }
793 }
794 DPRINTK("\n Sync: ");
795 c = block[0] & 0x10;
796 if (c)
797 DPRINTK(" Configurable signal level\n");
798 c = block[0] & 0x0f;
799 specs->signal = 0;
800 if (c & 0x10) {
801 DPRINTK("Blank to Blank ");
802 specs->signal |= FB_SIGNAL_BLANK_BLANK;
803 }
804 if (c & 0x08) {
805 DPRINTK("Separate ");
806 specs->signal |= FB_SIGNAL_SEPARATE;
807 }
808 if (c & 0x04) {
809 DPRINTK("Composite ");
810 specs->signal |= FB_SIGNAL_COMPOSITE;
811 }
812 if (c & 0x02) {
813 DPRINTK("Sync on Green ");
814 specs->signal |= FB_SIGNAL_SYNC_ON_GREEN;
815 }
816 if (c & 0x01) {
817 DPRINTK("Serration on ");
818 specs->signal |= FB_SIGNAL_SERRATION_ON;
819 }
820 DPRINTK("\n");
821 specs->max_x = block[1];
822 specs->max_y = block[2];
823 DPRINTK(" Max H-size in cm: ");
824 if (specs->max_x)
825 DPRINTK("%d\n", specs->max_x);
826 else
827 DPRINTK("variable\n");
828 DPRINTK(" Max V-size in cm: ");
829 if (specs->max_y)
830 DPRINTK("%d\n", specs->max_y);
831 else
832 DPRINTK("variable\n");
833
834 c = block[3];
835 specs->gamma = c+100;
836 DPRINTK(" Gamma: ");
837 DPRINTK("%d.%d\n", specs->gamma/100, specs->gamma % 100);
838
839 get_dpms_capabilities(block[4], specs);
840
841 switch ((block[4] & 0x18) >> 3) {
842 case 0:
843 DPRINTK(" Monochrome/Grayscale\n");
844 specs->input |= FB_DISP_MONO;
845 break;
846 case 1:
847 DPRINTK(" RGB Color Display\n");
848 specs->input |= FB_DISP_RGB;
849 break;
850 case 2:
851 DPRINTK(" Non-RGB Multicolor Display\n");
852 specs->input |= FB_DISP_MULTI;
853 break;
854 default:
855 DPRINTK(" Unknown\n");
856 specs->input |= FB_DISP_UNKNOWN;
857 break;
858 }
859
860 get_chroma(block, specs);
861
862 specs->misc = 0;
863 c = block[4] & 0x7;
864 if (c & 0x04) {
865 DPRINTK(" Default color format is primary\n");
866 specs->misc |= FB_MISC_PRIM_COLOR;
867 }
868 if (c & 0x02) {
869 DPRINTK(" First DETAILED Timing is preferred\n");
870 specs->misc |= FB_MISC_1ST_DETAIL;
871 }
872 if (c & 0x01) {
873 printk(" Display is GTF capable\n");
874 specs->gtf = 1;
875 }
876 }
877
878 int fb_parse_edid(unsigned char *edid, struct fb_var_screeninfo *var)
879 {
880 int i;
881 unsigned char *block;
882
883 if (edid == NULL || var == NULL)
884 return 1;
885
886 if (!(edid_checksum(edid)))
887 return 1;
888
889 if (!(edid_check_header(edid)))
890 return 1;
891
892 block = edid + DETAILED_TIMING_DESCRIPTIONS_START;
893
894 for (i = 0; i < 4; i++, block += DETAILED_TIMING_DESCRIPTION_SIZE) {
895 if (edid_is_timing_block(block)) {
896 var->xres = var->xres_virtual = H_ACTIVE;
897 var->yres = var->yres_virtual = V_ACTIVE;
898 var->height = var->width = 0;
899 var->right_margin = H_SYNC_OFFSET;
900 var->left_margin = (H_ACTIVE + H_BLANKING) -
901 (H_ACTIVE + H_SYNC_OFFSET + H_SYNC_WIDTH);
902 var->upper_margin = V_BLANKING - V_SYNC_OFFSET -
903 V_SYNC_WIDTH;
904 var->lower_margin = V_SYNC_OFFSET;
905 var->hsync_len = H_SYNC_WIDTH;
906 var->vsync_len = V_SYNC_WIDTH;
907 var->pixclock = PIXEL_CLOCK;
908 var->pixclock /= 1000;
909 var->pixclock = KHZ2PICOS(var->pixclock);
910
911 if (HSYNC_POSITIVE)
912 var->sync |= FB_SYNC_HOR_HIGH_ACT;
913 if (VSYNC_POSITIVE)
914 var->sync |= FB_SYNC_VERT_HIGH_ACT;
915 return 0;
916 }
917 }
918 return 1;
919 }
920
921 void fb_edid_to_monspecs(unsigned char *edid, struct fb_monspecs *specs)
922 {
923 unsigned char *block;
924 int i, found = 0;
925
926 if (edid == NULL)
927 return;
928
929 if (!(edid_checksum(edid)))
930 return;
931
932 if (!(edid_check_header(edid)))
933 return;
934
935 memset(specs, 0, sizeof(struct fb_monspecs));
936
937 specs->version = edid[EDID_STRUCT_VERSION];
938 specs->revision = edid[EDID_STRUCT_REVISION];
939
940 DPRINTK("========================================\n");
941 DPRINTK("Display Information (EDID)\n");
942 DPRINTK("========================================\n");
943 DPRINTK(" EDID Version %d.%d\n", (int) specs->version,
944 (int) specs->revision);
945
946 parse_vendor_block(edid + ID_MANUFACTURER_NAME, specs);
947
948 block = edid + DETAILED_TIMING_DESCRIPTIONS_START;
949 for (i = 0; i < 4; i++, block += DETAILED_TIMING_DESCRIPTION_SIZE) {
950 if (edid_is_serial_block(block)) {
951 copy_string(block, specs->serial_no);
952 DPRINTK(" Serial Number: %s\n", specs->serial_no);
953 } else if (edid_is_ascii_block(block)) {
954 copy_string(block, specs->ascii);
955 DPRINTK(" ASCII Block: %s\n", specs->ascii);
956 } else if (edid_is_monitor_block(block)) {
957 copy_string(block, specs->monitor);
958 DPRINTK(" Monitor Name: %s\n", specs->monitor);
959 }
960 }
961
962 DPRINTK(" Display Characteristics:\n");
963 get_monspecs(edid, specs);
964
965 specs->modedb = fb_create_modedb(edid, &specs->modedb_len);
966
967 /*
968 * Workaround for buggy EDIDs that sets that the first
969 * detailed timing is preferred but has not detailed
970 * timing specified
971 */
972 for (i = 0; i < specs->modedb_len; i++) {
973 if (specs->modedb[i].flag & FB_MODE_IS_DETAILED) {
974 found = 1;
975 break;
976 }
977 }
978
979 if (!found)
980 specs->misc &= ~FB_MISC_1ST_DETAIL;
981
982 DPRINTK("========================================\n");
983 }
984
985 /**
986 * fb_edid_add_monspecs() - add monitor video modes from E-EDID data
987 * @edid: 128 byte array with an E-EDID block
988 * @spacs: monitor specs to be extended
989 */
990 void fb_edid_add_monspecs(unsigned char *edid, struct fb_monspecs *specs)
991 {
992 unsigned char *block;
993 struct fb_videomode *m;
994 int num = 0, i;
995 u8 svd[64], edt[(128 - 4) / DETAILED_TIMING_DESCRIPTION_SIZE];
996 u8 pos = 4, svd_n = 0;
997
998 if (!edid)
999 return;
1000
1001 if (!edid_checksum(edid))
1002 return;
1003
1004 if (edid[0] != 0x2 ||
1005 edid[2] < 4 || edid[2] > 128 - DETAILED_TIMING_DESCRIPTION_SIZE)
1006 return;
1007
1008 DPRINTK(" Short Video Descriptors\n");
1009
1010 while (pos < edid[2]) {
1011 u8 len = edid[pos] & 0x1f, type = (edid[pos] >> 5) & 7;
1012 pr_debug("Data block %u of %u bytes\n", type, len);
1013 if (type == 2)
1014 for (i = pos; i < pos + len; i++) {
1015 u8 idx = edid[pos + i] & 0x7f;
1016 svd[svd_n++] = idx;
1017 pr_debug("N%sative mode #%d\n",
1018 edid[pos + i] & 0x80 ? "" : "on-n", idx);
1019 }
1020 pos += len + 1;
1021 }
1022
1023 block = edid + edid[2];
1024
1025 DPRINTK(" Extended Detailed Timings\n");
1026
1027 for (i = 0; i < (128 - edid[2]) / DETAILED_TIMING_DESCRIPTION_SIZE;
1028 i++, block += DETAILED_TIMING_DESCRIPTION_SIZE)
1029 if (PIXEL_CLOCK)
1030 edt[num++] = block - edid;
1031
1032 /* Yikes, EDID data is totally useless */
1033 if (!(num + svd_n))
1034 return;
1035
1036 m = kzalloc((specs->modedb_len + num + svd_n) *
1037 sizeof(struct fb_videomode), GFP_KERNEL);
1038
1039 if (!m)
1040 return;
1041
1042 memcpy(m, specs->modedb, specs->modedb_len * sizeof(struct fb_videomode));
1043
1044 for (i = specs->modedb_len; i < specs->modedb_len + num; i++) {
1045 get_detailed_timing(edid + edt[i - specs->modedb_len], &m[i]);
1046 if (i == specs->modedb_len)
1047 m[i].flag |= FB_MODE_IS_FIRST;
1048 pr_debug("Adding %ux%u@%u\n", m[i].xres, m[i].yres, m[i].refresh);
1049 }
1050
1051 for (i = specs->modedb_len + num; i < specs->modedb_len + num + svd_n; i++) {
1052 int idx = svd[i - specs->modedb_len - num];
1053 if (!idx || idx > 63) {
1054 pr_warning("Reserved SVD code %d\n", idx);
1055 } else if (idx > ARRAY_SIZE(cea_modes) || !cea_modes[idx].xres) {
1056 pr_warning("Unimplemented SVD code %d\n", idx);
1057 } else {
1058 memcpy(&m[i], cea_modes + idx, sizeof(m[i]));
1059 pr_debug("Adding SVD #%d: %ux%u@%u\n", idx,
1060 m[i].xres, m[i].yres, m[i].refresh);
1061 }
1062 }
1063
1064 kfree(specs->modedb);
1065 specs->modedb = m;
1066 specs->modedb_len = specs->modedb_len + num + svd_n;
1067 }
1068
1069 /*
1070 * VESA Generalized Timing Formula (GTF)
1071 */
1072
1073 #define FLYBACK 550
1074 #define V_FRONTPORCH 1
1075 #define H_OFFSET 40
1076 #define H_SCALEFACTOR 20
1077 #define H_BLANKSCALE 128
1078 #define H_GRADIENT 600
1079 #define C_VAL 30
1080 #define M_VAL 300
1081
1082 struct __fb_timings {
1083 u32 dclk;
1084 u32 hfreq;
1085 u32 vfreq;
1086 u32 hactive;
1087 u32 vactive;
1088 u32 hblank;
1089 u32 vblank;
1090 u32 htotal;
1091 u32 vtotal;
1092 };
1093
1094 /**
1095 * fb_get_vblank - get vertical blank time
1096 * @hfreq: horizontal freq
1097 *
1098 * DESCRIPTION:
1099 * vblank = right_margin + vsync_len + left_margin
1100 *
1101 * given: right_margin = 1 (V_FRONTPORCH)
1102 * vsync_len = 3
1103 * flyback = 550
1104 *
1105 * flyback * hfreq
1106 * left_margin = --------------- - vsync_len
1107 * 1000000
1108 */
1109 static u32 fb_get_vblank(u32 hfreq)
1110 {
1111 u32 vblank;
1112
1113 vblank = (hfreq * FLYBACK)/1000;
1114 vblank = (vblank + 500)/1000;
1115 return (vblank + V_FRONTPORCH);
1116 }
1117
1118 /**
1119 * fb_get_hblank_by_freq - get horizontal blank time given hfreq
1120 * @hfreq: horizontal freq
1121 * @xres: horizontal resolution in pixels
1122 *
1123 * DESCRIPTION:
1124 *
1125 * xres * duty_cycle
1126 * hblank = ------------------
1127 * 100 - duty_cycle
1128 *
1129 * duty cycle = percent of htotal assigned to inactive display
1130 * duty cycle = C - (M/Hfreq)
1131 *
1132 * where: C = ((offset - scale factor) * blank_scale)
1133 * -------------------------------------- + scale factor
1134 * 256
1135 * M = blank_scale * gradient
1136 *
1137 */
1138 static u32 fb_get_hblank_by_hfreq(u32 hfreq, u32 xres)
1139 {
1140 u32 c_val, m_val, duty_cycle, hblank;
1141
1142 c_val = (((H_OFFSET - H_SCALEFACTOR) * H_BLANKSCALE)/256 +
1143 H_SCALEFACTOR) * 1000;
1144 m_val = (H_BLANKSCALE * H_GRADIENT)/256;
1145 m_val = (m_val * 1000000)/hfreq;
1146 duty_cycle = c_val - m_val;
1147 hblank = (xres * duty_cycle)/(100000 - duty_cycle);
1148 return (hblank);
1149 }
1150
1151 /**
1152 * fb_get_hblank_by_dclk - get horizontal blank time given pixelclock
1153 * @dclk: pixelclock in Hz
1154 * @xres: horizontal resolution in pixels
1155 *
1156 * DESCRIPTION:
1157 *
1158 * xres * duty_cycle
1159 * hblank = ------------------
1160 * 100 - duty_cycle
1161 *
1162 * duty cycle = percent of htotal assigned to inactive display
1163 * duty cycle = C - (M * h_period)
1164 *
1165 * where: h_period = SQRT(100 - C + (0.4 * xres * M)/dclk) + C - 100
1166 * -----------------------------------------------
1167 * 2 * M
1168 * M = 300;
1169 * C = 30;
1170
1171 */
1172 static u32 fb_get_hblank_by_dclk(u32 dclk, u32 xres)
1173 {
1174 u32 duty_cycle, h_period, hblank;
1175
1176 dclk /= 1000;
1177 h_period = 100 - C_VAL;
1178 h_period *= h_period;
1179 h_period += (M_VAL * xres * 2 * 1000)/(5 * dclk);
1180 h_period *= 10000;
1181
1182 h_period = int_sqrt(h_period);
1183 h_period -= (100 - C_VAL) * 100;
1184 h_period *= 1000;
1185 h_period /= 2 * M_VAL;
1186
1187 duty_cycle = C_VAL * 1000 - (M_VAL * h_period)/100;
1188 hblank = (xres * duty_cycle)/(100000 - duty_cycle) + 8;
1189 hblank &= ~15;
1190 return (hblank);
1191 }
1192
1193 /**
1194 * fb_get_hfreq - estimate hsync
1195 * @vfreq: vertical refresh rate
1196 * @yres: vertical resolution
1197 *
1198 * DESCRIPTION:
1199 *
1200 * (yres + front_port) * vfreq * 1000000
1201 * hfreq = -------------------------------------
1202 * (1000000 - (vfreq * FLYBACK)
1203 *
1204 */
1205
1206 static u32 fb_get_hfreq(u32 vfreq, u32 yres)
1207 {
1208 u32 divisor, hfreq;
1209
1210 divisor = (1000000 - (vfreq * FLYBACK))/1000;
1211 hfreq = (yres + V_FRONTPORCH) * vfreq * 1000;
1212 return (hfreq/divisor);
1213 }
1214
1215 static void fb_timings_vfreq(struct __fb_timings *timings)
1216 {
1217 timings->hfreq = fb_get_hfreq(timings->vfreq, timings->vactive);
1218 timings->vblank = fb_get_vblank(timings->hfreq);
1219 timings->vtotal = timings->vactive + timings->vblank;
1220 timings->hblank = fb_get_hblank_by_hfreq(timings->hfreq,
1221 timings->hactive);
1222 timings->htotal = timings->hactive + timings->hblank;
1223 timings->dclk = timings->htotal * timings->hfreq;
1224 }
1225
1226 static void fb_timings_hfreq(struct __fb_timings *timings)
1227 {
1228 timings->vblank = fb_get_vblank(timings->hfreq);
1229 timings->vtotal = timings->vactive + timings->vblank;
1230 timings->vfreq = timings->hfreq/timings->vtotal;
1231 timings->hblank = fb_get_hblank_by_hfreq(timings->hfreq,
1232 timings->hactive);
1233 timings->htotal = timings->hactive + timings->hblank;
1234 timings->dclk = timings->htotal * timings->hfreq;
1235 }
1236
1237 static void fb_timings_dclk(struct __fb_timings *timings)
1238 {
1239 timings->hblank = fb_get_hblank_by_dclk(timings->dclk,
1240 timings->hactive);
1241 timings->htotal = timings->hactive + timings->hblank;
1242 timings->hfreq = timings->dclk/timings->htotal;
1243 timings->vblank = fb_get_vblank(timings->hfreq);
1244 timings->vtotal = timings->vactive + timings->vblank;
1245 timings->vfreq = timings->hfreq/timings->vtotal;
1246 }
1247
1248 /*
1249 * fb_get_mode - calculates video mode using VESA GTF
1250 * @flags: if: 0 - maximize vertical refresh rate
1251 * 1 - vrefresh-driven calculation;
1252 * 2 - hscan-driven calculation;
1253 * 3 - pixelclock-driven calculation;
1254 * @val: depending on @flags, ignored, vrefresh, hsync or pixelclock
1255 * @var: pointer to fb_var_screeninfo
1256 * @info: pointer to fb_info
1257 *
1258 * DESCRIPTION:
1259 * Calculates video mode based on monitor specs using VESA GTF.
1260 * The GTF is best for VESA GTF compliant monitors but is
1261 * specifically formulated to work for older monitors as well.
1262 *
1263 * If @flag==0, the function will attempt to maximize the
1264 * refresh rate. Otherwise, it will calculate timings based on
1265 * the flag and accompanying value.
1266 *
1267 * If FB_IGNOREMON bit is set in @flags, monitor specs will be
1268 * ignored and @var will be filled with the calculated timings.
1269 *
1270 * All calculations are based on the VESA GTF Spreadsheet
1271 * available at VESA's public ftp (http://www.vesa.org).
1272 *
1273 * NOTES:
1274 * The timings generated by the GTF will be different from VESA
1275 * DMT. It might be a good idea to keep a table of standard
1276 * VESA modes as well. The GTF may also not work for some displays,
1277 * such as, and especially, analog TV.
1278 *
1279 * REQUIRES:
1280 * A valid info->monspecs, otherwise 'safe numbers' will be used.
1281 */
1282 int fb_get_mode(int flags, u32 val, struct fb_var_screeninfo *var, struct fb_info *info)
1283 {
1284 struct __fb_timings *timings;
1285 u32 interlace = 1, dscan = 1;
1286 u32 hfmin, hfmax, vfmin, vfmax, dclkmin, dclkmax, err = 0;
1287
1288
1289 timings = kzalloc(sizeof(struct __fb_timings), GFP_KERNEL);
1290
1291 if (!timings)
1292 return -ENOMEM;
1293
1294 /*
1295 * If monspecs are invalid, use values that are enough
1296 * for 640x480@60
1297 */
1298 if (!info || !info->monspecs.hfmax || !info->monspecs.vfmax ||
1299 !info->monspecs.dclkmax ||
1300 info->monspecs.hfmax < info->monspecs.hfmin ||
1301 info->monspecs.vfmax < info->monspecs.vfmin ||
1302 info->monspecs.dclkmax < info->monspecs.dclkmin) {
1303 hfmin = 29000; hfmax = 30000;
1304 vfmin = 60; vfmax = 60;
1305 dclkmin = 0; dclkmax = 25000000;
1306 } else {
1307 hfmin = info->monspecs.hfmin;
1308 hfmax = info->monspecs.hfmax;
1309 vfmin = info->monspecs.vfmin;
1310 vfmax = info->monspecs.vfmax;
1311 dclkmin = info->monspecs.dclkmin;
1312 dclkmax = info->monspecs.dclkmax;
1313 }
1314
1315 timings->hactive = var->xres;
1316 timings->vactive = var->yres;
1317 if (var->vmode & FB_VMODE_INTERLACED) {
1318 timings->vactive /= 2;
1319 interlace = 2;
1320 }
1321 if (var->vmode & FB_VMODE_DOUBLE) {
1322 timings->vactive *= 2;
1323 dscan = 2;
1324 }
1325
1326 switch (flags & ~FB_IGNOREMON) {
1327 case FB_MAXTIMINGS: /* maximize refresh rate */
1328 timings->hfreq = hfmax;
1329 fb_timings_hfreq(timings);
1330 if (timings->vfreq > vfmax) {
1331 timings->vfreq = vfmax;
1332 fb_timings_vfreq(timings);
1333 }
1334 if (timings->dclk > dclkmax) {
1335 timings->dclk = dclkmax;
1336 fb_timings_dclk(timings);
1337 }
1338 break;
1339 case FB_VSYNCTIMINGS: /* vrefresh driven */
1340 timings->vfreq = val;
1341 fb_timings_vfreq(timings);
1342 break;
1343 case FB_HSYNCTIMINGS: /* hsync driven */
1344 timings->hfreq = val;
1345 fb_timings_hfreq(timings);
1346 break;
1347 case FB_DCLKTIMINGS: /* pixelclock driven */
1348 timings->dclk = PICOS2KHZ(val) * 1000;
1349 fb_timings_dclk(timings);
1350 break;
1351 default:
1352 err = -EINVAL;
1353
1354 }
1355
1356 if (err || (!(flags & FB_IGNOREMON) &&
1357 (timings->vfreq < vfmin || timings->vfreq > vfmax ||
1358 timings->hfreq < hfmin || timings->hfreq > hfmax ||
1359 timings->dclk < dclkmin || timings->dclk > dclkmax))) {
1360 err = -EINVAL;
1361 } else {
1362 var->pixclock = KHZ2PICOS(timings->dclk/1000);
1363 var->hsync_len = (timings->htotal * 8)/100;
1364 var->right_margin = (timings->hblank/2) - var->hsync_len;
1365 var->left_margin = timings->hblank - var->right_margin -
1366 var->hsync_len;
1367 var->vsync_len = (3 * interlace)/dscan;
1368 var->lower_margin = (1 * interlace)/dscan;
1369 var->upper_margin = (timings->vblank * interlace)/dscan -
1370 (var->vsync_len + var->lower_margin);
1371 }
1372
1373 kfree(timings);
1374 return err;
1375 }
1376 #else
1377 int fb_parse_edid(unsigned char *edid, struct fb_var_screeninfo *var)
1378 {
1379 return 1;
1380 }
1381 void fb_edid_to_monspecs(unsigned char *edid, struct fb_monspecs *specs)
1382 {
1383 specs = NULL;
1384 }
1385 void fb_edid_add_monspecs(unsigned char *edid, struct fb_monspecs *specs)
1386 {
1387 }
1388 void fb_destroy_modedb(struct fb_videomode *modedb)
1389 {
1390 }
1391 int fb_get_mode(int flags, u32 val, struct fb_var_screeninfo *var,
1392 struct fb_info *info)
1393 {
1394 return -EINVAL;
1395 }
1396 #endif /* CONFIG_FB_MODE_HELPERS */
1397
1398 /*
1399 * fb_validate_mode - validates var against monitor capabilities
1400 * @var: pointer to fb_var_screeninfo
1401 * @info: pointer to fb_info
1402 *
1403 * DESCRIPTION:
1404 * Validates video mode against monitor capabilities specified in
1405 * info->monspecs.
1406 *
1407 * REQUIRES:
1408 * A valid info->monspecs.
1409 */
1410 int fb_validate_mode(const struct fb_var_screeninfo *var, struct fb_info *info)
1411 {
1412 u32 hfreq, vfreq, htotal, vtotal, pixclock;
1413 u32 hfmin, hfmax, vfmin, vfmax, dclkmin, dclkmax;
1414
1415 /*
1416 * If monspecs are invalid, use values that are enough
1417 * for 640x480@60
1418 */
1419 if (!info->monspecs.hfmax || !info->monspecs.vfmax ||
1420 !info->monspecs.dclkmax ||
1421 info->monspecs.hfmax < info->monspecs.hfmin ||
1422 info->monspecs.vfmax < info->monspecs.vfmin ||
1423 info->monspecs.dclkmax < info->monspecs.dclkmin) {
1424 hfmin = 29000; hfmax = 30000;
1425 vfmin = 60; vfmax = 60;
1426 dclkmin = 0; dclkmax = 25000000;
1427 } else {
1428 hfmin = info->monspecs.hfmin;
1429 hfmax = info->monspecs.hfmax;
1430 vfmin = info->monspecs.vfmin;
1431 vfmax = info->monspecs.vfmax;
1432 dclkmin = info->monspecs.dclkmin;
1433 dclkmax = info->monspecs.dclkmax;
1434 }
1435
1436 if (!var->pixclock)
1437 return -EINVAL;
1438 pixclock = PICOS2KHZ(var->pixclock) * 1000;
1439
1440 htotal = var->xres + var->right_margin + var->hsync_len +
1441 var->left_margin;
1442 vtotal = var->yres + var->lower_margin + var->vsync_len +
1443 var->upper_margin;
1444
1445 if (var->vmode & FB_VMODE_INTERLACED)
1446 vtotal /= 2;
1447 if (var->vmode & FB_VMODE_DOUBLE)
1448 vtotal *= 2;
1449
1450 hfreq = pixclock/htotal;
1451 hfreq = (hfreq + 500) / 1000 * 1000;
1452
1453 vfreq = hfreq/vtotal;
1454
1455 return (vfreq < vfmin || vfreq > vfmax ||
1456 hfreq < hfmin || hfreq > hfmax ||
1457 pixclock < dclkmin || pixclock > dclkmax) ?
1458 -EINVAL : 0;
1459 }
1460
1461 #if defined(CONFIG_FIRMWARE_EDID) && defined(CONFIG_X86)
1462
1463 /*
1464 * We need to ensure that the EDID block is only returned for
1465 * the primary graphics adapter.
1466 */
1467
1468 const unsigned char *fb_firmware_edid(struct device *device)
1469 {
1470 struct pci_dev *dev = NULL;
1471 struct resource *res = NULL;
1472 unsigned char *edid = NULL;
1473
1474 if (device)
1475 dev = to_pci_dev(device);
1476
1477 if (dev)
1478 res = &dev->resource[PCI_ROM_RESOURCE];
1479
1480 if (res && res->flags & IORESOURCE_ROM_SHADOW)
1481 edid = edid_info.dummy;
1482
1483 return edid;
1484 }
1485 #else
1486 const unsigned char *fb_firmware_edid(struct device *device)
1487 {
1488 return NULL;
1489 }
1490 #endif
1491 EXPORT_SYMBOL(fb_firmware_edid);
1492
1493 EXPORT_SYMBOL(fb_parse_edid);
1494 EXPORT_SYMBOL(fb_edid_to_monspecs);
1495 EXPORT_SYMBOL(fb_edid_add_monspecs);
1496 EXPORT_SYMBOL(fb_get_mode);
1497 EXPORT_SYMBOL(fb_validate_mode);
1498 EXPORT_SYMBOL(fb_destroy_modedb);
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