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 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 static const unsigned char edid_v1_header[] = { 0x00, 0xff, 0xff, 0xff,
84 0xff, 0xff, 0xff, 0x00
85 };
86
copy_string(unsigned char * c,unsigned char * s)87 static 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
edid_is_serial_block(unsigned char * block)97 static 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
edid_is_ascii_block(unsigned char * block)107 static 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
edid_is_limits_block(unsigned char * block)117 static 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
edid_is_monitor_block(unsigned char * block)127 static 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
edid_is_timing_block(unsigned char * block)137 static 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
check_edid(unsigned char * edid)146 static 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
fix_edid(unsigned char * edid,int fix)208 static 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
edid_checksum(unsigned char * edid)257 static 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
edid_check_header(unsigned char * edid)278 static 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
parse_vendor_block(unsigned char * block,struct fb_monspecs * specs)293 static 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
get_dpms_capabilities(unsigned char flags,struct fb_monspecs * specs)311 static 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
get_chroma(unsigned char * block,struct fb_monspecs * specs)327 static 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
calc_mode_timings(int xres,int yres,int refresh,struct fb_videomode * mode)382 static 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
get_est_timing(unsigned char * block,struct fb_videomode * mode)410 static 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
get_std_timing(unsigned char * block,struct fb_videomode * mode)495 static 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
get_dst_timing(unsigned char * block,struct fb_videomode * mode)534 static 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
get_detailed_timing(unsigned char * block,struct fb_videomode * mode)545 static 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 if (INTERLACED) {
568 mode->yres *= 2;
569 mode->upper_margin *= 2;
570 mode->lower_margin *= 2;
571 mode->vsync_len *= 2;
572 mode->vmode |= FB_VMODE_INTERLACED;
573 }
574 mode->flag = FB_MODE_IS_DETAILED;
575
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 */
fb_create_modedb(unsigned char * edid,int * dbsize)596 static struct fb_videomode *fb_create_modedb(unsigned char *edid, int *dbsize)
597 {
598 struct fb_videomode *mode, *m;
599 unsigned char *block;
600 int num = 0, i, first = 1;
601
602 mode = kzalloc(50 * sizeof(struct fb_videomode), GFP_KERNEL);
603 if (mode == NULL)
604 return NULL;
605
606 if (edid == NULL || !edid_checksum(edid) ||
607 !edid_check_header(edid)) {
608 kfree(mode);
609 return NULL;
610 }
611
612 *dbsize = 0;
613
614 DPRINTK(" Detailed Timings\n");
615 block = edid + DETAILED_TIMING_DESCRIPTIONS_START;
616 for (i = 0; i < 4; i++, block+= DETAILED_TIMING_DESCRIPTION_SIZE) {
617 if (!(block[0] == 0x00 && block[1] == 0x00)) {
618 get_detailed_timing(block, &mode[num]);
619 if (first) {
620 mode[num].flag |= FB_MODE_IS_FIRST;
621 first = 0;
622 }
623 num++;
624 }
625 }
626
627 DPRINTK(" Supported VESA Modes\n");
628 block = edid + ESTABLISHED_TIMING_1;
629 num += get_est_timing(block, &mode[num]);
630
631 DPRINTK(" Standard Timings\n");
632 block = edid + STD_TIMING_DESCRIPTIONS_START;
633 for (i = 0; i < STD_TIMING; i++, block += STD_TIMING_DESCRIPTION_SIZE)
634 num += get_std_timing(block, &mode[num]);
635
636 block = edid + DETAILED_TIMING_DESCRIPTIONS_START;
637 for (i = 0; i < 4; i++, block+= DETAILED_TIMING_DESCRIPTION_SIZE) {
638 if (block[0] == 0x00 && block[1] == 0x00 && block[3] == 0xfa)
639 num += get_dst_timing(block + 5, &mode[num]);
640 }
641
642 /* Yikes, EDID data is totally useless */
643 if (!num) {
644 kfree(mode);
645 return NULL;
646 }
647
648 *dbsize = num;
649 m = kmalloc(num * sizeof(struct fb_videomode), GFP_KERNEL);
650 if (!m)
651 return mode;
652 memmove(m, mode, num * sizeof(struct fb_videomode));
653 kfree(mode);
654 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 */
fb_destroy_modedb(struct fb_videomode * modedb)664 void fb_destroy_modedb(struct fb_videomode *modedb)
665 {
666 kfree(modedb);
667 }
668
fb_get_monitor_limits(unsigned char * edid,struct fb_monspecs * specs)669 static int fb_get_monitor_limits(unsigned char *edid, struct fb_monspecs *specs)
670 {
671 int i, retval = 1;
672 unsigned char *block;
673
674 block = edid + DETAILED_TIMING_DESCRIPTIONS_START;
675
676 DPRINTK(" Monitor Operating Limits: ");
677
678 for (i = 0; i < 4; i++, block += DETAILED_TIMING_DESCRIPTION_SIZE) {
679 if (edid_is_limits_block(block)) {
680 specs->hfmin = H_MIN_RATE * 1000;
681 specs->hfmax = H_MAX_RATE * 1000;
682 specs->vfmin = V_MIN_RATE;
683 specs->vfmax = V_MAX_RATE;
684 specs->dclkmax = MAX_PIXEL_CLOCK * 1000000;
685 specs->gtf = (GTF_SUPPORT) ? 1 : 0;
686 retval = 0;
687 DPRINTK("From EDID\n");
688 break;
689 }
690 }
691
692 /* estimate monitor limits based on modes supported */
693 if (retval) {
694 struct fb_videomode *modes, *mode;
695 int num_modes, hz, hscan, pixclock;
696 int vtotal, htotal;
697
698 modes = fb_create_modedb(edid, &num_modes);
699 if (!modes) {
700 DPRINTK("None Available\n");
701 return 1;
702 }
703
704 retval = 0;
705 for (i = 0; i < num_modes; i++) {
706 mode = &modes[i];
707 pixclock = PICOS2KHZ(modes[i].pixclock) * 1000;
708 htotal = mode->xres + mode->right_margin + mode->hsync_len
709 + mode->left_margin;
710 vtotal = mode->yres + mode->lower_margin + mode->vsync_len
711 + mode->upper_margin;
712
713 if (mode->vmode & FB_VMODE_INTERLACED)
714 vtotal /= 2;
715
716 if (mode->vmode & FB_VMODE_DOUBLE)
717 vtotal *= 2;
718
719 hscan = (pixclock + htotal / 2) / htotal;
720 hscan = (hscan + 500) / 1000 * 1000;
721 hz = (hscan + vtotal / 2) / vtotal;
722
723 if (specs->dclkmax == 0 || specs->dclkmax < pixclock)
724 specs->dclkmax = pixclock;
725
726 if (specs->dclkmin == 0 || specs->dclkmin > pixclock)
727 specs->dclkmin = pixclock;
728
729 if (specs->hfmax == 0 || specs->hfmax < hscan)
730 specs->hfmax = hscan;
731
732 if (specs->hfmin == 0 || specs->hfmin > hscan)
733 specs->hfmin = hscan;
734
735 if (specs->vfmax == 0 || specs->vfmax < hz)
736 specs->vfmax = hz;
737
738 if (specs->vfmin == 0 || specs->vfmin > hz)
739 specs->vfmin = hz;
740 }
741 DPRINTK("Extrapolated\n");
742 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 return retval;
748 }
749
get_monspecs(unsigned char * edid,struct fb_monspecs * specs)750 static void get_monspecs(unsigned char *edid, struct fb_monspecs *specs)
751 {
752 unsigned char c, *block;
753
754 block = edid + EDID_STRUCT_DISPLAY;
755
756 fb_get_monitor_limits(edid, specs);
757
758 c = block[0] & 0x80;
759 specs->input = 0;
760 if (c) {
761 specs->input |= FB_DISP_DDI;
762 DPRINTK(" Digital Display Input");
763 } else {
764 DPRINTK(" Analog Display Input: Input Voltage - ");
765 switch ((block[0] & 0x60) >> 5) {
766 case 0:
767 DPRINTK("0.700V/0.300V");
768 specs->input |= FB_DISP_ANA_700_300;
769 break;
770 case 1:
771 DPRINTK("0.714V/0.286V");
772 specs->input |= FB_DISP_ANA_714_286;
773 break;
774 case 2:
775 DPRINTK("1.000V/0.400V");
776 specs->input |= FB_DISP_ANA_1000_400;
777 break;
778 case 3:
779 DPRINTK("0.700V/0.000V");
780 specs->input |= FB_DISP_ANA_700_000;
781 break;
782 }
783 }
784 DPRINTK("\n Sync: ");
785 c = block[0] & 0x10;
786 if (c)
787 DPRINTK(" Configurable signal level\n");
788 c = block[0] & 0x0f;
789 specs->signal = 0;
790 if (c & 0x10) {
791 DPRINTK("Blank to Blank ");
792 specs->signal |= FB_SIGNAL_BLANK_BLANK;
793 }
794 if (c & 0x08) {
795 DPRINTK("Separate ");
796 specs->signal |= FB_SIGNAL_SEPARATE;
797 }
798 if (c & 0x04) {
799 DPRINTK("Composite ");
800 specs->signal |= FB_SIGNAL_COMPOSITE;
801 }
802 if (c & 0x02) {
803 DPRINTK("Sync on Green ");
804 specs->signal |= FB_SIGNAL_SYNC_ON_GREEN;
805 }
806 if (c & 0x01) {
807 DPRINTK("Serration on ");
808 specs->signal |= FB_SIGNAL_SERRATION_ON;
809 }
810 DPRINTK("\n");
811 specs->max_x = block[1];
812 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 c = block[3];
825 specs->gamma = c+100;
826 DPRINTK(" Gamma: ");
827 DPRINTK("%d.%d\n", specs->gamma/100, specs->gamma % 100);
828
829 get_dpms_capabilities(block[4], specs);
830
831 switch ((block[4] & 0x18) >> 3) {
832 case 0:
833 DPRINTK(" Monochrome/Grayscale\n");
834 specs->input |= FB_DISP_MONO;
835 break;
836 case 1:
837 DPRINTK(" RGB Color Display\n");
838 specs->input |= FB_DISP_RGB;
839 break;
840 case 2:
841 DPRINTK(" Non-RGB Multicolor Display\n");
842 specs->input |= FB_DISP_MULTI;
843 break;
844 default:
845 DPRINTK(" Unknown\n");
846 specs->input |= FB_DISP_UNKNOWN;
847 break;
848 }
849
850 get_chroma(block, specs);
851
852 specs->misc = 0;
853 c = block[4] & 0x7;
854 if (c & 0x04) {
855 DPRINTK(" Default color format is primary\n");
856 specs->misc |= FB_MISC_PRIM_COLOR;
857 }
858 if (c & 0x02) {
859 DPRINTK(" First DETAILED Timing is preferred\n");
860 specs->misc |= FB_MISC_1ST_DETAIL;
861 }
862 if (c & 0x01) {
863 printk(" Display is GTF capable\n");
864 specs->gtf = 1;
865 }
866 }
867
fb_parse_edid(unsigned char * edid,struct fb_var_screeninfo * var)868 int fb_parse_edid(unsigned char *edid, struct fb_var_screeninfo *var)
869 {
870 int i;
871 unsigned char *block;
872
873 if (edid == NULL || var == NULL)
874 return 1;
875
876 if (!(edid_checksum(edid)))
877 return 1;
878
879 if (!(edid_check_header(edid)))
880 return 1;
881
882 block = edid + DETAILED_TIMING_DESCRIPTIONS_START;
883
884 for (i = 0; i < 4; i++, block += DETAILED_TIMING_DESCRIPTION_SIZE) {
885 if (edid_is_timing_block(block)) {
886 var->xres = var->xres_virtual = H_ACTIVE;
887 var->yres = var->yres_virtual = V_ACTIVE;
888 var->height = var->width = 0;
889 var->right_margin = H_SYNC_OFFSET;
890 var->left_margin = (H_ACTIVE + H_BLANKING) -
891 (H_ACTIVE + H_SYNC_OFFSET + H_SYNC_WIDTH);
892 var->upper_margin = V_BLANKING - V_SYNC_OFFSET -
893 V_SYNC_WIDTH;
894 var->lower_margin = V_SYNC_OFFSET;
895 var->hsync_len = H_SYNC_WIDTH;
896 var->vsync_len = V_SYNC_WIDTH;
897 var->pixclock = PIXEL_CLOCK;
898 var->pixclock /= 1000;
899 var->pixclock = KHZ2PICOS(var->pixclock);
900
901 if (HSYNC_POSITIVE)
902 var->sync |= FB_SYNC_HOR_HIGH_ACT;
903 if (VSYNC_POSITIVE)
904 var->sync |= FB_SYNC_VERT_HIGH_ACT;
905 return 0;
906 }
907 }
908 return 1;
909 }
910
fb_edid_to_monspecs(unsigned char * edid,struct fb_monspecs * specs)911 void fb_edid_to_monspecs(unsigned char *edid, struct fb_monspecs *specs)
912 {
913 unsigned char *block;
914 int i, found = 0;
915
916 if (edid == NULL)
917 return;
918
919 if (!(edid_checksum(edid)))
920 return;
921
922 if (!(edid_check_header(edid)))
923 return;
924
925 memset(specs, 0, sizeof(struct fb_monspecs));
926
927 specs->version = edid[EDID_STRUCT_VERSION];
928 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 parse_vendor_block(edid + ID_MANUFACTURER_NAME, specs);
937
938 block = edid + DETAILED_TIMING_DESCRIPTIONS_START;
939 for (i = 0; i < 4; i++, block += DETAILED_TIMING_DESCRIPTION_SIZE) {
940 if (edid_is_serial_block(block)) {
941 copy_string(block, specs->serial_no);
942 DPRINTK(" Serial Number: %s\n", specs->serial_no);
943 } else if (edid_is_ascii_block(block)) {
944 copy_string(block, specs->ascii);
945 DPRINTK(" ASCII Block: %s\n", specs->ascii);
946 } else if (edid_is_monitor_block(block)) {
947 copy_string(block, specs->monitor);
948 DPRINTK(" Monitor Name: %s\n", specs->monitor);
949 }
950 }
951
952 DPRINTK(" Display Characteristics:\n");
953 get_monspecs(edid, specs);
954
955 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 for (i = 0; i < specs->modedb_len; i++) {
963 if (specs->modedb[i].flag & FB_MODE_IS_DETAILED) {
964 found = 1;
965 break;
966 }
967 }
968
969 if (!found)
970 specs->misc &= ~FB_MISC_1ST_DETAIL;
971
972 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 */
fb_get_vblank(u32 hfreq)1015 static u32 fb_get_vblank(u32 hfreq)
1016 {
1017 u32 vblank;
1018
1019 vblank = (hfreq * FLYBACK)/1000;
1020 vblank = (vblank + 500)/1000;
1021 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 */
fb_get_hblank_by_hfreq(u32 hfreq,u32 xres)1044 static u32 fb_get_hblank_by_hfreq(u32 hfreq, u32 xres)
1045 {
1046 u32 c_val, m_val, duty_cycle, hblank;
1047
1048 c_val = (((H_OFFSET - H_SCALEFACTOR) * H_BLANKSCALE)/256 +
1049 H_SCALEFACTOR) * 1000;
1050 m_val = (H_BLANKSCALE * H_GRADIENT)/256;
1051 m_val = (m_val * 1000000)/hfreq;
1052 duty_cycle = c_val - m_val;
1053 hblank = (xres * duty_cycle)/(100000 - duty_cycle);
1054 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 */
fb_get_hblank_by_dclk(u32 dclk,u32 xres)1078 static u32 fb_get_hblank_by_dclk(u32 dclk, u32 xres)
1079 {
1080 u32 duty_cycle, h_period, hblank;
1081
1082 dclk /= 1000;
1083 h_period = 100 - C_VAL;
1084 h_period *= h_period;
1085 h_period += (M_VAL * xres * 2 * 1000)/(5 * dclk);
1086 h_period *= 10000;
1087
1088 h_period = int_sqrt(h_period);
1089 h_period -= (100 - C_VAL) * 100;
1090 h_period *= 1000;
1091 h_period /= 2 * M_VAL;
1092
1093 duty_cycle = C_VAL * 1000 - (M_VAL * h_period)/100;
1094 hblank = (xres * duty_cycle)/(100000 - duty_cycle) + 8;
1095 hblank &= ~15;
1096 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
fb_get_hfreq(u32 vfreq,u32 yres)1112 static u32 fb_get_hfreq(u32 vfreq, u32 yres)
1113 {
1114 u32 divisor, hfreq;
1115
1116 divisor = (1000000 - (vfreq * FLYBACK))/1000;
1117 hfreq = (yres + V_FRONTPORCH) * vfreq * 1000;
1118 return (hfreq/divisor);
1119 }
1120
fb_timings_vfreq(struct __fb_timings * timings)1121 static void fb_timings_vfreq(struct __fb_timings *timings)
1122 {
1123 timings->hfreq = fb_get_hfreq(timings->vfreq, timings->vactive);
1124 timings->vblank = fb_get_vblank(timings->hfreq);
1125 timings->vtotal = timings->vactive + timings->vblank;
1126 timings->hblank = fb_get_hblank_by_hfreq(timings->hfreq,
1127 timings->hactive);
1128 timings->htotal = timings->hactive + timings->hblank;
1129 timings->dclk = timings->htotal * timings->hfreq;
1130 }
1131
fb_timings_hfreq(struct __fb_timings * timings)1132 static void fb_timings_hfreq(struct __fb_timings *timings)
1133 {
1134 timings->vblank = fb_get_vblank(timings->hfreq);
1135 timings->vtotal = timings->vactive + timings->vblank;
1136 timings->vfreq = timings->hfreq/timings->vtotal;
1137 timings->hblank = fb_get_hblank_by_hfreq(timings->hfreq,
1138 timings->hactive);
1139 timings->htotal = timings->hactive + timings->hblank;
1140 timings->dclk = timings->htotal * timings->hfreq;
1141 }
1142
fb_timings_dclk(struct __fb_timings * timings)1143 static void fb_timings_dclk(struct __fb_timings *timings)
1144 {
1145 timings->hblank = fb_get_hblank_by_dclk(timings->dclk,
1146 timings->hactive);
1147 timings->htotal = timings->hactive + timings->hblank;
1148 timings->hfreq = timings->dclk/timings->htotal;
1149 timings->vblank = fb_get_vblank(timings->hfreq);
1150 timings->vtotal = timings->vactive + timings->vblank;
1151 timings->vfreq = timings->hfreq/timings->vtotal;
1152 }
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 */
fb_get_mode(int flags,u32 val,struct fb_var_screeninfo * var,struct fb_info * info)1188 int fb_get_mode(int flags, u32 val, struct fb_var_screeninfo *var, struct fb_info *info)
1189 {
1190 struct __fb_timings *timings;
1191 u32 interlace = 1, dscan = 1;
1192 u32 hfmin, hfmax, vfmin, vfmax, dclkmin, dclkmax, err = 0;
1193
1194
1195 timings = kzalloc(sizeof(struct __fb_timings), GFP_KERNEL);
1196
1197 if (!timings)
1198 return -ENOMEM;
1199
1200 /*
1201 * If monspecs are invalid, use values that are enough
1202 * for 640x480@60
1203 */
1204 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 hfmin = 29000; hfmax = 30000;
1210 vfmin = 60; vfmax = 60;
1211 dclkmin = 0; dclkmax = 25000000;
1212 } else {
1213 hfmin = info->monspecs.hfmin;
1214 hfmax = info->monspecs.hfmax;
1215 vfmin = info->monspecs.vfmin;
1216 vfmax = info->monspecs.vfmax;
1217 dclkmin = info->monspecs.dclkmin;
1218 dclkmax = info->monspecs.dclkmax;
1219 }
1220
1221 timings->hactive = var->xres;
1222 timings->vactive = var->yres;
1223 if (var->vmode & FB_VMODE_INTERLACED) {
1224 timings->vactive /= 2;
1225 interlace = 2;
1226 }
1227 if (var->vmode & FB_VMODE_DOUBLE) {
1228 timings->vactive *= 2;
1229 dscan = 2;
1230 }
1231
1232 switch (flags & ~FB_IGNOREMON) {
1233 case FB_MAXTIMINGS: /* maximize refresh rate */
1234 timings->hfreq = hfmax;
1235 fb_timings_hfreq(timings);
1236 if (timings->vfreq > vfmax) {
1237 timings->vfreq = vfmax;
1238 fb_timings_vfreq(timings);
1239 }
1240 if (timings->dclk > dclkmax) {
1241 timings->dclk = dclkmax;
1242 fb_timings_dclk(timings);
1243 }
1244 break;
1245 case FB_VSYNCTIMINGS: /* vrefresh driven */
1246 timings->vfreq = val;
1247 fb_timings_vfreq(timings);
1248 break;
1249 case FB_HSYNCTIMINGS: /* hsync driven */
1250 timings->hfreq = val;
1251 fb_timings_hfreq(timings);
1252 break;
1253 case FB_DCLKTIMINGS: /* pixelclock driven */
1254 timings->dclk = PICOS2KHZ(val) * 1000;
1255 fb_timings_dclk(timings);
1256 break;
1257 default:
1258 err = -EINVAL;
1259
1260 }
1261
1262 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 err = -EINVAL;
1267 } else {
1268 var->pixclock = KHZ2PICOS(timings->dclk/1000);
1269 var->hsync_len = (timings->htotal * 8)/100;
1270 var->right_margin = (timings->hblank/2) - var->hsync_len;
1271 var->left_margin = timings->hblank - var->right_margin -
1272 var->hsync_len;
1273 var->vsync_len = (3 * interlace)/dscan;
1274 var->lower_margin = (1 * interlace)/dscan;
1275 var->upper_margin = (timings->vblank * interlace)/dscan -
1276 (var->vsync_len + var->lower_margin);
1277 }
1278
1279 kfree(timings);
1280 return err;
1281 }
1282 #else
fb_parse_edid(unsigned char * edid,struct fb_var_screeninfo * var)1283 int fb_parse_edid(unsigned char *edid, struct fb_var_screeninfo *var)
1284 {
1285 return 1;
1286 }
fb_edid_to_monspecs(unsigned char * edid,struct fb_monspecs * specs)1287 void fb_edid_to_monspecs(unsigned char *edid, struct fb_monspecs *specs)
1288 {
1289 specs = NULL;
1290 }
fb_destroy_modedb(struct fb_videomode * modedb)1291 void fb_destroy_modedb(struct fb_videomode *modedb)
1292 {
1293 }
fb_get_mode(int flags,u32 val,struct fb_var_screeninfo * var,struct fb_info * info)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 */
fb_validate_mode(const struct fb_var_screeninfo * var,struct fb_info * info)1313 int fb_validate_mode(const struct fb_var_screeninfo *var, struct fb_info *info)
1314 {
1315 u32 hfreq, vfreq, htotal, vtotal, pixclock;
1316 u32 hfmin, hfmax, vfmin, vfmax, dclkmin, dclkmax;
1317
1318 /*
1319 * If monspecs are invalid, use values that are enough
1320 * for 640x480@60
1321 */
1322 if (!info->monspecs.hfmax || !info->monspecs.vfmax ||
1323 !info->monspecs.dclkmax ||
1324 info->monspecs.hfmax < info->monspecs.hfmin ||
1325 info->monspecs.vfmax < info->monspecs.vfmin ||
1326 info->monspecs.dclkmax < info->monspecs.dclkmin) {
1327 hfmin = 29000; hfmax = 30000;
1328 vfmin = 60; vfmax = 60;
1329 dclkmin = 0; dclkmax = 25000000;
1330 } else {
1331 hfmin = info->monspecs.hfmin;
1332 hfmax = info->monspecs.hfmax;
1333 vfmin = info->monspecs.vfmin;
1334 vfmax = info->monspecs.vfmax;
1335 dclkmin = info->monspecs.dclkmin;
1336 dclkmax = info->monspecs.dclkmax;
1337 }
1338
1339 if (!var->pixclock)
1340 return -EINVAL;
1341 pixclock = PICOS2KHZ(var->pixclock) * 1000;
1342
1343 htotal = var->xres + var->right_margin + var->hsync_len +
1344 var->left_margin;
1345 vtotal = var->yres + var->lower_margin + var->vsync_len +
1346 var->upper_margin;
1347
1348 if (var->vmode & FB_VMODE_INTERLACED)
1349 vtotal /= 2;
1350 if (var->vmode & FB_VMODE_DOUBLE)
1351 vtotal *= 2;
1352
1353 hfreq = pixclock/htotal;
1354 hfreq = (hfreq + 500) / 1000 * 1000;
1355
1356 vfreq = hfreq/vtotal;
1357
1358 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
fb_firmware_edid(struct device * device)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
fb_firmware_edid(struct device * device)1389 const unsigned char *fb_firmware_edid(struct device *device)
1390 {
1391 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);
1401