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 https://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
30 #include <linux/export.h>
31 #include <linux/fb.h>
32 #include <linux/module.h>
33 #include <linux/pci.h>
34 #include <linux/slab.h>
35 #include <linux/string_choices.h>
36 #include <linux/sysfb.h>
37
38 #include <video/of_videomode.h>
39 #include <video/videomode.h>
40
41 #include "../edid.h"
42
43 /*
44 * EDID parser
45 */
46
47 #undef DEBUG /* define this for verbose EDID parsing output */
48
49 #ifdef DEBUG
50 #define DPRINTK(fmt, args...) printk(fmt,## args)
51 #else
52 #define DPRINTK(fmt, args...) no_printk(fmt, ##args)
53 #endif
54
55 #define FBMON_FIX_HEADER 1
56 #define FBMON_FIX_INPUT 2
57 #define FBMON_FIX_TIMINGS 3
58
59 #ifdef CONFIG_FB_MODE_HELPERS
60 struct broken_edid {
61 u8 manufacturer[4];
62 u32 model;
63 u32 fix;
64 };
65
66 static const struct broken_edid brokendb[] = {
67 /* DEC FR-PCXAV-YZ */
68 {
69 .manufacturer = "DEC",
70 .model = 0x073a,
71 .fix = FBMON_FIX_HEADER,
72 },
73 /* ViewSonic PF775a */
74 {
75 .manufacturer = "VSC",
76 .model = 0x5a44,
77 .fix = FBMON_FIX_INPUT,
78 },
79 /* Sharp UXGA? */
80 {
81 .manufacturer = "SHP",
82 .model = 0x138e,
83 .fix = FBMON_FIX_TIMINGS,
84 },
85 };
86
87 static const unsigned char edid_v1_header[] = { 0x00, 0xff, 0xff, 0xff,
88 0xff, 0xff, 0xff, 0x00
89 };
90
copy_string(unsigned char * c,unsigned char * s)91 static void copy_string(unsigned char *c, unsigned char *s)
92 {
93 int i;
94 c = c + 5;
95 for (i = 0; (i < 13 && *c != 0x0A); i++)
96 *(s++) = *(c++);
97 *s = 0;
98 while (i-- && (*--s == 0x20)) *s = 0;
99 }
100
edid_is_serial_block(unsigned char * block)101 static int edid_is_serial_block(unsigned char *block)
102 {
103 if ((block[0] == 0x00) && (block[1] == 0x00) &&
104 (block[2] == 0x00) && (block[3] == 0xff) &&
105 (block[4] == 0x00))
106 return 1;
107 else
108 return 0;
109 }
110
edid_is_ascii_block(unsigned char * block)111 static int edid_is_ascii_block(unsigned char *block)
112 {
113 if ((block[0] == 0x00) && (block[1] == 0x00) &&
114 (block[2] == 0x00) && (block[3] == 0xfe) &&
115 (block[4] == 0x00))
116 return 1;
117 else
118 return 0;
119 }
120
edid_is_limits_block(unsigned char * block)121 static int edid_is_limits_block(unsigned char *block)
122 {
123 if ((block[0] == 0x00) && (block[1] == 0x00) &&
124 (block[2] == 0x00) && (block[3] == 0xfd) &&
125 (block[4] == 0x00))
126 return 1;
127 else
128 return 0;
129 }
130
edid_is_monitor_block(unsigned char * block)131 static int edid_is_monitor_block(unsigned char *block)
132 {
133 if ((block[0] == 0x00) && (block[1] == 0x00) &&
134 (block[2] == 0x00) && (block[3] == 0xfc) &&
135 (block[4] == 0x00))
136 return 1;
137 else
138 return 0;
139 }
140
edid_is_timing_block(unsigned char * block)141 static int edid_is_timing_block(unsigned char *block)
142 {
143 if ((block[0] != 0x00) || (block[1] != 0x00) ||
144 (block[2] != 0x00) || (block[4] != 0x00))
145 return 1;
146 else
147 return 0;
148 }
149
check_edid(unsigned char * edid)150 static int check_edid(unsigned char *edid)
151 {
152 unsigned char *block = edid + ID_MANUFACTURER_NAME, manufacturer[4];
153 unsigned char *b;
154 u32 model;
155 int i, fix = 0, ret = 0;
156
157 manufacturer[0] = ((block[0] & 0x7c) >> 2) + '@';
158 manufacturer[1] = ((block[0] & 0x03) << 3) +
159 ((block[1] & 0xe0) >> 5) + '@';
160 manufacturer[2] = (block[1] & 0x1f) + '@';
161 manufacturer[3] = 0;
162 model = block[2] + (block[3] << 8);
163
164 for (i = 0; i < ARRAY_SIZE(brokendb); i++) {
165 if (!strncmp(manufacturer, brokendb[i].manufacturer, 4) &&
166 brokendb[i].model == model) {
167 fix = brokendb[i].fix;
168 break;
169 }
170 }
171
172 switch (fix) {
173 case FBMON_FIX_HEADER:
174 for (i = 0; i < 8; i++) {
175 if (edid[i] != edid_v1_header[i]) {
176 ret = fix;
177 break;
178 }
179 }
180 break;
181 case FBMON_FIX_INPUT:
182 b = edid + EDID_STRUCT_DISPLAY;
183 /* Only if display is GTF capable will
184 the input type be reset to analog */
185 if (b[4] & 0x01 && b[0] & 0x80)
186 ret = fix;
187 break;
188 case FBMON_FIX_TIMINGS:
189 b = edid + DETAILED_TIMING_DESCRIPTIONS_START;
190 ret = fix;
191
192 for (i = 0; i < 4; i++) {
193 if (edid_is_limits_block(b)) {
194 ret = 0;
195 break;
196 }
197
198 b += DETAILED_TIMING_DESCRIPTION_SIZE;
199 }
200
201 break;
202 }
203
204 if (ret)
205 printk("fbmon: The EDID Block of "
206 "Manufacturer: %s Model: 0x%x is known to "
207 "be broken,\n", manufacturer, model);
208
209 return ret;
210 }
211
fix_edid(unsigned char * edid,int fix)212 static void fix_edid(unsigned char *edid, int fix)
213 {
214 int i;
215 unsigned char *b, csum = 0;
216
217 switch (fix) {
218 case FBMON_FIX_HEADER:
219 printk("fbmon: trying a header reconstruct\n");
220 memcpy(edid, edid_v1_header, 8);
221 break;
222 case FBMON_FIX_INPUT:
223 printk("fbmon: trying to fix input type\n");
224 b = edid + EDID_STRUCT_DISPLAY;
225 b[0] &= ~0x80;
226 edid[127] += 0x80;
227 break;
228 case FBMON_FIX_TIMINGS:
229 printk("fbmon: trying to fix monitor timings\n");
230 b = edid + DETAILED_TIMING_DESCRIPTIONS_START;
231 for (i = 0; i < 4; i++) {
232 if (!(edid_is_serial_block(b) ||
233 edid_is_ascii_block(b) ||
234 edid_is_monitor_block(b) ||
235 edid_is_timing_block(b))) {
236 b[0] = 0x00;
237 b[1] = 0x00;
238 b[2] = 0x00;
239 b[3] = 0xfd;
240 b[4] = 0x00;
241 b[5] = 60; /* vfmin */
242 b[6] = 60; /* vfmax */
243 b[7] = 30; /* hfmin */
244 b[8] = 75; /* hfmax */
245 b[9] = 17; /* pixclock - 170 MHz*/
246 b[10] = 0; /* GTF */
247 break;
248 }
249
250 b += DETAILED_TIMING_DESCRIPTION_SIZE;
251 }
252
253 for (i = 0; i < EDID_LENGTH - 1; i++)
254 csum += edid[i];
255
256 edid[127] = 256 - csum;
257 break;
258 }
259 }
260
edid_checksum(unsigned char * edid)261 static int edid_checksum(unsigned char *edid)
262 {
263 unsigned char csum = 0, all_null = 0;
264 int i, err = 0, fix = check_edid(edid);
265
266 if (fix)
267 fix_edid(edid, fix);
268
269 for (i = 0; i < EDID_LENGTH; i++) {
270 csum += edid[i];
271 all_null |= edid[i];
272 }
273
274 if (csum == 0x00 && all_null) {
275 /* checksum passed, everything's good */
276 err = 1;
277 }
278
279 return err;
280 }
281
edid_check_header(unsigned char * edid)282 static int edid_check_header(unsigned char *edid)
283 {
284 int i, err = 1, fix = check_edid(edid);
285
286 if (fix)
287 fix_edid(edid, fix);
288
289 for (i = 0; i < 8; i++) {
290 if (edid[i] != edid_v1_header[i])
291 err = 0;
292 }
293
294 return err;
295 }
296
parse_vendor_block(unsigned char * block,struct fb_monspecs * specs)297 static void parse_vendor_block(unsigned char *block, struct fb_monspecs *specs)
298 {
299 specs->manufacturer[0] = ((block[0] & 0x7c) >> 2) + '@';
300 specs->manufacturer[1] = ((block[0] & 0x03) << 3) +
301 ((block[1] & 0xe0) >> 5) + '@';
302 specs->manufacturer[2] = (block[1] & 0x1f) + '@';
303 specs->manufacturer[3] = 0;
304 specs->model = block[2] + (block[3] << 8);
305 specs->serial = block[4] + (block[5] << 8) +
306 (block[6] << 16) + (block[7] << 24);
307 specs->year = block[9] + 1990;
308 specs->week = block[8];
309 DPRINTK(" Manufacturer: %s\n", specs->manufacturer);
310 DPRINTK(" Model: %x\n", specs->model);
311 DPRINTK(" Serial#: %u\n", specs->serial);
312 DPRINTK(" Year: %u Week %u\n", specs->year, specs->week);
313 }
314
get_dpms_capabilities(unsigned char flags,struct fb_monspecs * specs)315 static void get_dpms_capabilities(unsigned char flags,
316 struct fb_monspecs *specs)
317 {
318 specs->dpms = 0;
319 if (flags & DPMS_ACTIVE_OFF)
320 specs->dpms |= FB_DPMS_ACTIVE_OFF;
321 if (flags & DPMS_SUSPEND)
322 specs->dpms |= FB_DPMS_SUSPEND;
323 if (flags & DPMS_STANDBY)
324 specs->dpms |= FB_DPMS_STANDBY;
325 DPRINTK(" DPMS: Active %s, Suspend %s, Standby %s\n",
326 str_yes_no(flags & DPMS_ACTIVE_OFF),
327 str_yes_no(flags & DPMS_SUSPEND),
328 str_yes_no(flags & DPMS_STANDBY));
329 }
330
get_chroma(unsigned char * block,struct fb_monspecs * specs)331 static void get_chroma(unsigned char *block, struct fb_monspecs *specs)
332 {
333 int tmp;
334
335 DPRINTK(" Chroma\n");
336 /* Chromaticity data */
337 tmp = ((block[5] & (3 << 6)) >> 6) | (block[0x7] << 2);
338 tmp *= 1000;
339 tmp += 512;
340 specs->chroma.redx = tmp/1024;
341 DPRINTK(" RedX: 0.%03d ", specs->chroma.redx);
342
343 tmp = ((block[5] & (3 << 4)) >> 4) | (block[0x8] << 2);
344 tmp *= 1000;
345 tmp += 512;
346 specs->chroma.redy = tmp/1024;
347 DPRINTK("RedY: 0.%03d\n", specs->chroma.redy);
348
349 tmp = ((block[5] & (3 << 2)) >> 2) | (block[0x9] << 2);
350 tmp *= 1000;
351 tmp += 512;
352 specs->chroma.greenx = tmp/1024;
353 DPRINTK(" GreenX: 0.%03d ", specs->chroma.greenx);
354
355 tmp = (block[5] & 3) | (block[0xa] << 2);
356 tmp *= 1000;
357 tmp += 512;
358 specs->chroma.greeny = tmp/1024;
359 DPRINTK("GreenY: 0.%03d\n", specs->chroma.greeny);
360
361 tmp = ((block[6] & (3 << 6)) >> 6) | (block[0xb] << 2);
362 tmp *= 1000;
363 tmp += 512;
364 specs->chroma.bluex = tmp/1024;
365 DPRINTK(" BlueX: 0.%03d ", specs->chroma.bluex);
366
367 tmp = ((block[6] & (3 << 4)) >> 4) | (block[0xc] << 2);
368 tmp *= 1000;
369 tmp += 512;
370 specs->chroma.bluey = tmp/1024;
371 DPRINTK("BlueY: 0.%03d\n", specs->chroma.bluey);
372
373 tmp = ((block[6] & (3 << 2)) >> 2) | (block[0xd] << 2);
374 tmp *= 1000;
375 tmp += 512;
376 specs->chroma.whitex = tmp/1024;
377 DPRINTK(" WhiteX: 0.%03d ", specs->chroma.whitex);
378
379 tmp = (block[6] & 3) | (block[0xe] << 2);
380 tmp *= 1000;
381 tmp += 512;
382 specs->chroma.whitey = tmp/1024;
383 DPRINTK("WhiteY: 0.%03d\n", specs->chroma.whitey);
384 }
385
calc_mode_timings(int xres,int yres,int refresh,struct fb_videomode * mode)386 static void calc_mode_timings(int xres, int yres, int refresh,
387 struct fb_videomode *mode)
388 {
389 struct fb_var_screeninfo *var;
390
391 var = kzalloc_obj(struct fb_var_screeninfo);
392
393 if (var) {
394 var->xres = xres;
395 var->yres = yres;
396 fb_get_mode(FB_VSYNCTIMINGS | FB_IGNOREMON,
397 refresh, var, NULL);
398 mode->xres = xres;
399 mode->yres = yres;
400 mode->pixclock = var->pixclock;
401 mode->refresh = refresh;
402 mode->left_margin = var->left_margin;
403 mode->right_margin = var->right_margin;
404 mode->upper_margin = var->upper_margin;
405 mode->lower_margin = var->lower_margin;
406 mode->hsync_len = var->hsync_len;
407 mode->vsync_len = var->vsync_len;
408 mode->vmode = 0;
409 mode->sync = 0;
410 kfree(var);
411 }
412 }
413
get_est_timing(unsigned char * block,struct fb_videomode * mode)414 static int get_est_timing(unsigned char *block, struct fb_videomode *mode)
415 {
416 int num = 0;
417 unsigned char c;
418
419 c = block[0];
420 if (c&0x80) {
421 calc_mode_timings(720, 400, 70, &mode[num]);
422 mode[num++].flag = FB_MODE_IS_CALCULATED;
423 DPRINTK(" 720x400@70Hz\n");
424 }
425 if (c&0x40) {
426 calc_mode_timings(720, 400, 88, &mode[num]);
427 mode[num++].flag = FB_MODE_IS_CALCULATED;
428 DPRINTK(" 720x400@88Hz\n");
429 }
430 if (c&0x20) {
431 mode[num++] = vesa_modes[3];
432 DPRINTK(" 640x480@60Hz\n");
433 }
434 if (c&0x10) {
435 calc_mode_timings(640, 480, 67, &mode[num]);
436 mode[num++].flag = FB_MODE_IS_CALCULATED;
437 DPRINTK(" 640x480@67Hz\n");
438 }
439 if (c&0x08) {
440 mode[num++] = vesa_modes[4];
441 DPRINTK(" 640x480@72Hz\n");
442 }
443 if (c&0x04) {
444 mode[num++] = vesa_modes[5];
445 DPRINTK(" 640x480@75Hz\n");
446 }
447 if (c&0x02) {
448 mode[num++] = vesa_modes[7];
449 DPRINTK(" 800x600@56Hz\n");
450 }
451 if (c&0x01) {
452 mode[num++] = vesa_modes[8];
453 DPRINTK(" 800x600@60Hz\n");
454 }
455
456 c = block[1];
457 if (c&0x80) {
458 mode[num++] = vesa_modes[9];
459 DPRINTK(" 800x600@72Hz\n");
460 }
461 if (c&0x40) {
462 mode[num++] = vesa_modes[10];
463 DPRINTK(" 800x600@75Hz\n");
464 }
465 if (c&0x20) {
466 calc_mode_timings(832, 624, 75, &mode[num]);
467 mode[num++].flag = FB_MODE_IS_CALCULATED;
468 DPRINTK(" 832x624@75Hz\n");
469 }
470 if (c&0x10) {
471 mode[num++] = vesa_modes[12];
472 DPRINTK(" 1024x768@87Hz Interlaced\n");
473 }
474 if (c&0x08) {
475 mode[num++] = vesa_modes[13];
476 DPRINTK(" 1024x768@60Hz\n");
477 }
478 if (c&0x04) {
479 mode[num++] = vesa_modes[14];
480 DPRINTK(" 1024x768@70Hz\n");
481 }
482 if (c&0x02) {
483 mode[num++] = vesa_modes[15];
484 DPRINTK(" 1024x768@75Hz\n");
485 }
486 if (c&0x01) {
487 mode[num++] = vesa_modes[21];
488 DPRINTK(" 1280x1024@75Hz\n");
489 }
490 c = block[2];
491 if (c&0x80) {
492 mode[num++] = vesa_modes[17];
493 DPRINTK(" 1152x870@75Hz\n");
494 }
495 DPRINTK(" Manufacturer's mask: %x\n",c&0x7F);
496 return num;
497 }
498
get_std_timing(unsigned char * block,struct fb_videomode * mode,int ver,int rev,const struct fb_monspecs * specs)499 static int get_std_timing(unsigned char *block, struct fb_videomode *mode,
500 int ver, int rev, const struct fb_monspecs *specs)
501 {
502 int i;
503
504 for (i = 0; i < DMT_SIZE; i++) {
505 u32 std_2byte_code = block[0] << 8 | block[1];
506 if (std_2byte_code == dmt_modes[i].std_2byte_code)
507 break;
508 }
509
510 if (i < DMT_SIZE && dmt_modes[i].mode) {
511 /* DMT mode found */
512 *mode = *dmt_modes[i].mode;
513 mode->flag |= FB_MODE_IS_STANDARD;
514 DPRINTK(" DMT id=%d\n", dmt_modes[i].dmt_id);
515
516 } else {
517 int xres, yres = 0, refresh, ratio;
518
519 xres = (block[0] + 31) * 8;
520 if (xres <= 256)
521 return 0;
522
523 ratio = (block[1] & 0xc0) >> 6;
524 switch (ratio) {
525 case 0:
526 /* in EDID 1.3 the meaning of 0 changed to 16:10 (prior 1:1) */
527 if (ver < 1 || (ver == 1 && rev < 3))
528 yres = xres;
529 else
530 yres = (xres * 10)/16;
531 break;
532 case 1:
533 yres = (xres * 3)/4;
534 break;
535 case 2:
536 yres = (xres * 4)/5;
537 break;
538 case 3:
539 yres = (xres * 9)/16;
540 break;
541 }
542 refresh = (block[1] & 0x3f) + 60;
543 DPRINTK(" %dx%d@%dHz\n", xres, yres, refresh);
544
545 calc_mode_timings(xres, yres, refresh, mode);
546 }
547
548 /* Check the mode we got is within valid spec of the monitor */
549 if (specs && specs->dclkmax
550 && PICOS2KHZ(mode->pixclock) * 1000 > specs->dclkmax) {
551 DPRINTK(" mode exceed max DCLK\n");
552 return 0;
553 }
554
555 return 1;
556 }
557
get_dst_timing(unsigned char * block,struct fb_videomode * mode,int ver,int rev,const struct fb_monspecs * specs)558 static int get_dst_timing(unsigned char *block, struct fb_videomode *mode,
559 int ver, int rev, const struct fb_monspecs *specs)
560 {
561 int j, num = 0;
562
563 for (j = 0; j < 6; j++, block += STD_TIMING_DESCRIPTION_SIZE)
564 num += get_std_timing(block, &mode[num], ver, rev, specs);
565
566 return num;
567 }
568
get_detailed_timing(unsigned char * block,struct fb_videomode * mode)569 static void get_detailed_timing(unsigned char *block,
570 struct fb_videomode *mode)
571 {
572 mode->xres = H_ACTIVE;
573 mode->yres = V_ACTIVE;
574 mode->pixclock = PIXEL_CLOCK;
575 mode->pixclock /= 1000;
576 mode->pixclock = KHZ2PICOS(mode->pixclock);
577 mode->right_margin = H_SYNC_OFFSET;
578 mode->left_margin = (H_ACTIVE + H_BLANKING) -
579 (H_ACTIVE + H_SYNC_OFFSET + H_SYNC_WIDTH);
580 mode->upper_margin = V_BLANKING - V_SYNC_OFFSET -
581 V_SYNC_WIDTH;
582 mode->lower_margin = V_SYNC_OFFSET;
583 mode->hsync_len = H_SYNC_WIDTH;
584 mode->vsync_len = V_SYNC_WIDTH;
585 if (HSYNC_POSITIVE)
586 mode->sync |= FB_SYNC_HOR_HIGH_ACT;
587 if (VSYNC_POSITIVE)
588 mode->sync |= FB_SYNC_VERT_HIGH_ACT;
589 mode->refresh = PIXEL_CLOCK/((H_ACTIVE + H_BLANKING) *
590 (V_ACTIVE + V_BLANKING));
591 if (INTERLACED) {
592 mode->yres *= 2;
593 mode->upper_margin *= 2;
594 mode->lower_margin *= 2;
595 mode->vsync_len *= 2;
596 mode->vmode |= FB_VMODE_INTERLACED;
597 }
598 mode->flag = FB_MODE_IS_DETAILED;
599
600 DPRINTK(" %d MHz ", PIXEL_CLOCK/1000000);
601 DPRINTK("%d %d %d %d ", H_ACTIVE, H_ACTIVE + H_SYNC_OFFSET,
602 H_ACTIVE + H_SYNC_OFFSET + H_SYNC_WIDTH, H_ACTIVE + H_BLANKING);
603 DPRINTK("%d %d %d %d ", V_ACTIVE, V_ACTIVE + V_SYNC_OFFSET,
604 V_ACTIVE + V_SYNC_OFFSET + V_SYNC_WIDTH, V_ACTIVE + V_BLANKING);
605 DPRINTK("%sHSync %sVSync\n\n", (HSYNC_POSITIVE) ? "+" : "-",
606 (VSYNC_POSITIVE) ? "+" : "-");
607 }
608
609 /**
610 * fb_create_modedb - create video mode database
611 * @edid: EDID data
612 * @dbsize: database size
613 * @specs: monitor specifications, may be NULL
614 *
615 * RETURNS: struct fb_videomode, @dbsize contains length of database
616 *
617 * DESCRIPTION:
618 * This function builds a mode database using the contents of the EDID
619 * data
620 */
fb_create_modedb(unsigned char * edid,int * dbsize,const struct fb_monspecs * specs)621 static struct fb_videomode *fb_create_modedb(unsigned char *edid, int *dbsize,
622 const struct fb_monspecs *specs)
623 {
624 struct fb_videomode *mode, *m;
625 unsigned char *block;
626 int num = 0, i, first = 1;
627 int ver, rev;
628
629 mode = kzalloc_objs(struct fb_videomode, 50);
630 if (mode == NULL)
631 return NULL;
632
633 if (edid == NULL || !edid_checksum(edid) ||
634 !edid_check_header(edid)) {
635 kfree(mode);
636 return NULL;
637 }
638
639 ver = edid[EDID_STRUCT_VERSION];
640 rev = edid[EDID_STRUCT_REVISION];
641
642 *dbsize = 0;
643
644 DPRINTK(" Detailed Timings\n");
645 block = edid + DETAILED_TIMING_DESCRIPTIONS_START;
646 for (i = 0; i < 4; i++, block+= DETAILED_TIMING_DESCRIPTION_SIZE) {
647 if (!(block[0] == 0x00 && block[1] == 0x00)) {
648 get_detailed_timing(block, &mode[num]);
649 if (first) {
650 mode[num].flag |= FB_MODE_IS_FIRST;
651 first = 0;
652 }
653 num++;
654 }
655 }
656
657 DPRINTK(" Supported VESA Modes\n");
658 block = edid + ESTABLISHED_TIMING_1;
659 num += get_est_timing(block, &mode[num]);
660
661 DPRINTK(" Standard Timings\n");
662 block = edid + STD_TIMING_DESCRIPTIONS_START;
663 for (i = 0; i < STD_TIMING; i++, block += STD_TIMING_DESCRIPTION_SIZE)
664 num += get_std_timing(block, &mode[num], ver, rev, specs);
665
666 block = edid + DETAILED_TIMING_DESCRIPTIONS_START;
667 for (i = 0; i < 4; i++, block+= DETAILED_TIMING_DESCRIPTION_SIZE) {
668 if (block[0] == 0x00 && block[1] == 0x00 && block[3] == 0xfa)
669 num += get_dst_timing(block + 5, &mode[num],
670 ver, rev, specs);
671 }
672
673 /* Yikes, EDID data is totally useless */
674 if (!num) {
675 kfree(mode);
676 return NULL;
677 }
678
679 *dbsize = num;
680 m = kmalloc_objs(struct fb_videomode, num);
681 if (!m)
682 return mode;
683 memmove(m, mode, num * sizeof(struct fb_videomode));
684 kfree(mode);
685 return m;
686 }
687
688 /**
689 * fb_destroy_modedb - destroys mode database
690 * @modedb: mode database to destroy
691 *
692 * DESCRIPTION:
693 * Destroy mode database created by fb_create_modedb
694 */
fb_destroy_modedb(struct fb_videomode * modedb)695 void fb_destroy_modedb(struct fb_videomode *modedb)
696 {
697 kfree(modedb);
698 }
699
fb_get_monitor_limits(unsigned char * edid,struct fb_monspecs * specs)700 static int fb_get_monitor_limits(unsigned char *edid, struct fb_monspecs *specs)
701 {
702 int i, retval = 1;
703 unsigned char *block;
704
705 block = edid + DETAILED_TIMING_DESCRIPTIONS_START;
706
707 DPRINTK(" Monitor Operating Limits: ");
708
709 for (i = 0; i < 4; i++, block += DETAILED_TIMING_DESCRIPTION_SIZE) {
710 if (edid_is_limits_block(block)) {
711 specs->hfmin = H_MIN_RATE * 1000;
712 specs->hfmax = H_MAX_RATE * 1000;
713 specs->vfmin = V_MIN_RATE;
714 specs->vfmax = V_MAX_RATE;
715 specs->dclkmax = MAX_PIXEL_CLOCK * 1000000;
716 specs->gtf = (GTF_SUPPORT) ? 1 : 0;
717 retval = 0;
718 DPRINTK("From EDID\n");
719 break;
720 }
721 }
722
723 /* estimate monitor limits based on modes supported */
724 if (retval) {
725 struct fb_videomode *modes, *mode;
726 int num_modes, hz, hscan, pixclock;
727 int vtotal, htotal;
728
729 modes = fb_create_modedb(edid, &num_modes, specs);
730 if (!modes) {
731 DPRINTK("None Available\n");
732 return 1;
733 }
734
735 retval = 0;
736 for (i = 0; i < num_modes; i++) {
737 mode = &modes[i];
738 pixclock = PICOS2KHZ(modes[i].pixclock) * 1000;
739 htotal = mode->xres + mode->right_margin + mode->hsync_len
740 + mode->left_margin;
741 vtotal = mode->yres + mode->lower_margin + mode->vsync_len
742 + mode->upper_margin;
743
744 if (mode->vmode & FB_VMODE_INTERLACED)
745 vtotal /= 2;
746
747 if (mode->vmode & FB_VMODE_DOUBLE)
748 vtotal *= 2;
749
750 hscan = (pixclock + htotal / 2) / htotal;
751 hscan = (hscan + 500) / 1000 * 1000;
752 hz = (hscan + vtotal / 2) / vtotal;
753
754 if (specs->dclkmax == 0 || specs->dclkmax < pixclock)
755 specs->dclkmax = pixclock;
756
757 if (specs->dclkmin == 0 || specs->dclkmin > pixclock)
758 specs->dclkmin = pixclock;
759
760 if (specs->hfmax == 0 || specs->hfmax < hscan)
761 specs->hfmax = hscan;
762
763 if (specs->hfmin == 0 || specs->hfmin > hscan)
764 specs->hfmin = hscan;
765
766 if (specs->vfmax == 0 || specs->vfmax < hz)
767 specs->vfmax = hz;
768
769 if (specs->vfmin == 0 || specs->vfmin > hz)
770 specs->vfmin = hz;
771 }
772 DPRINTK("Extrapolated\n");
773 fb_destroy_modedb(modes);
774 }
775 DPRINTK(" H: %d-%dKHz V: %d-%dHz DCLK: %dMHz\n",
776 specs->hfmin/1000, specs->hfmax/1000, specs->vfmin,
777 specs->vfmax, specs->dclkmax/1000000);
778 return retval;
779 }
780
get_monspecs(unsigned char * edid,struct fb_monspecs * specs)781 static void get_monspecs(unsigned char *edid, struct fb_monspecs *specs)
782 {
783 unsigned char c, *block;
784
785 block = edid + EDID_STRUCT_DISPLAY;
786
787 fb_get_monitor_limits(edid, specs);
788
789 c = block[0] & 0x80;
790 specs->input = 0;
791 if (c) {
792 specs->input |= FB_DISP_DDI;
793 DPRINTK(" Digital Display Input");
794 } else {
795 DPRINTK(" Analog Display Input: Input Voltage - ");
796 switch ((block[0] & 0x60) >> 5) {
797 case 0:
798 DPRINTK("0.700V/0.300V");
799 specs->input |= FB_DISP_ANA_700_300;
800 break;
801 case 1:
802 DPRINTK("0.714V/0.286V");
803 specs->input |= FB_DISP_ANA_714_286;
804 break;
805 case 2:
806 DPRINTK("1.000V/0.400V");
807 specs->input |= FB_DISP_ANA_1000_400;
808 break;
809 case 3:
810 DPRINTK("0.700V/0.000V");
811 specs->input |= FB_DISP_ANA_700_000;
812 break;
813 }
814 }
815 DPRINTK("\n Sync: ");
816 c = block[0] & 0x10;
817 if (c)
818 DPRINTK(" Configurable signal level\n");
819 c = block[0] & 0x0f;
820 specs->signal = 0;
821 if (c & 0x10) {
822 DPRINTK("Blank to Blank ");
823 specs->signal |= FB_SIGNAL_BLANK_BLANK;
824 }
825 if (c & 0x08) {
826 DPRINTK("Separate ");
827 specs->signal |= FB_SIGNAL_SEPARATE;
828 }
829 if (c & 0x04) {
830 DPRINTK("Composite ");
831 specs->signal |= FB_SIGNAL_COMPOSITE;
832 }
833 if (c & 0x02) {
834 DPRINTK("Sync on Green ");
835 specs->signal |= FB_SIGNAL_SYNC_ON_GREEN;
836 }
837 if (c & 0x01) {
838 DPRINTK("Serration on ");
839 specs->signal |= FB_SIGNAL_SERRATION_ON;
840 }
841 DPRINTK("\n");
842 specs->max_x = block[1];
843 specs->max_y = block[2];
844 DPRINTK(" Max H-size in cm: ");
845 if (specs->max_x)
846 DPRINTK("%d\n", specs->max_x);
847 else
848 DPRINTK("variable\n");
849 DPRINTK(" Max V-size in cm: ");
850 if (specs->max_y)
851 DPRINTK("%d\n", specs->max_y);
852 else
853 DPRINTK("variable\n");
854
855 c = block[3];
856 specs->gamma = c+100;
857 DPRINTK(" Gamma: ");
858 DPRINTK("%d.%d\n", specs->gamma/100, specs->gamma % 100);
859
860 get_dpms_capabilities(block[4], specs);
861
862 switch ((block[4] & 0x18) >> 3) {
863 case 0:
864 DPRINTK(" Monochrome/Grayscale\n");
865 specs->input |= FB_DISP_MONO;
866 break;
867 case 1:
868 DPRINTK(" RGB Color Display\n");
869 specs->input |= FB_DISP_RGB;
870 break;
871 case 2:
872 DPRINTK(" Non-RGB Multicolor Display\n");
873 specs->input |= FB_DISP_MULTI;
874 break;
875 default:
876 DPRINTK(" Unknown\n");
877 specs->input |= FB_DISP_UNKNOWN;
878 break;
879 }
880
881 get_chroma(block, specs);
882
883 specs->misc = 0;
884 c = block[4] & 0x7;
885 if (c & 0x04) {
886 DPRINTK(" Default color format is primary\n");
887 specs->misc |= FB_MISC_PRIM_COLOR;
888 }
889 if (c & 0x02) {
890 DPRINTK(" First DETAILED Timing is preferred\n");
891 specs->misc |= FB_MISC_1ST_DETAIL;
892 }
893 if (c & 0x01) {
894 printk(" Display is GTF capable\n");
895 specs->gtf = 1;
896 }
897 }
898
fb_parse_edid(unsigned char * edid,struct fb_var_screeninfo * var)899 int fb_parse_edid(unsigned char *edid, struct fb_var_screeninfo *var)
900 {
901 int i;
902 unsigned char *block;
903
904 if (edid == NULL || var == NULL)
905 return 1;
906
907 if (!(edid_checksum(edid)))
908 return 1;
909
910 if (!(edid_check_header(edid)))
911 return 1;
912
913 block = edid + DETAILED_TIMING_DESCRIPTIONS_START;
914
915 for (i = 0; i < 4; i++, block += DETAILED_TIMING_DESCRIPTION_SIZE) {
916 if (edid_is_timing_block(block)) {
917 var->xres = var->xres_virtual = H_ACTIVE;
918 var->yres = var->yres_virtual = V_ACTIVE;
919 var->height = var->width = 0;
920 var->right_margin = H_SYNC_OFFSET;
921 var->left_margin = (H_ACTIVE + H_BLANKING) -
922 (H_ACTIVE + H_SYNC_OFFSET + H_SYNC_WIDTH);
923 var->upper_margin = V_BLANKING - V_SYNC_OFFSET -
924 V_SYNC_WIDTH;
925 var->lower_margin = V_SYNC_OFFSET;
926 var->hsync_len = H_SYNC_WIDTH;
927 var->vsync_len = V_SYNC_WIDTH;
928 var->pixclock = PIXEL_CLOCK;
929 var->pixclock /= 1000;
930 var->pixclock = KHZ2PICOS(var->pixclock);
931
932 if (HSYNC_POSITIVE)
933 var->sync |= FB_SYNC_HOR_HIGH_ACT;
934 if (VSYNC_POSITIVE)
935 var->sync |= FB_SYNC_VERT_HIGH_ACT;
936 return 0;
937 }
938 }
939 return 1;
940 }
941
fb_edid_to_monspecs(unsigned char * edid,struct fb_monspecs * specs)942 void fb_edid_to_monspecs(unsigned char *edid, struct fb_monspecs *specs)
943 {
944 unsigned char *block;
945 int i, found = 0;
946
947 if (edid == NULL)
948 return;
949
950 if (!(edid_checksum(edid)))
951 return;
952
953 if (!(edid_check_header(edid)))
954 return;
955
956 memset(specs, 0, sizeof(struct fb_monspecs));
957
958 specs->version = edid[EDID_STRUCT_VERSION];
959 specs->revision = edid[EDID_STRUCT_REVISION];
960
961 DPRINTK("========================================\n");
962 DPRINTK("Display Information (EDID)\n");
963 DPRINTK("========================================\n");
964 DPRINTK(" EDID Version %d.%d\n", (int) specs->version,
965 (int) specs->revision);
966
967 parse_vendor_block(edid + ID_MANUFACTURER_NAME, specs);
968
969 block = edid + DETAILED_TIMING_DESCRIPTIONS_START;
970 for (i = 0; i < 4; i++, block += DETAILED_TIMING_DESCRIPTION_SIZE) {
971 if (edid_is_serial_block(block)) {
972 copy_string(block, specs->serial_no);
973 DPRINTK(" Serial Number: %s\n", specs->serial_no);
974 } else if (edid_is_ascii_block(block)) {
975 copy_string(block, specs->ascii);
976 DPRINTK(" ASCII Block: %s\n", specs->ascii);
977 } else if (edid_is_monitor_block(block)) {
978 copy_string(block, specs->monitor);
979 DPRINTK(" Monitor Name: %s\n", specs->monitor);
980 }
981 }
982
983 DPRINTK(" Display Characteristics:\n");
984 get_monspecs(edid, specs);
985
986 specs->modedb = fb_create_modedb(edid, &specs->modedb_len, specs);
987 if (!specs->modedb)
988 return;
989
990 /*
991 * Workaround for buggy EDIDs that sets that the first
992 * detailed timing is preferred but has not detailed
993 * timing specified
994 */
995 for (i = 0; i < specs->modedb_len; i++) {
996 if (specs->modedb[i].flag & FB_MODE_IS_DETAILED) {
997 found = 1;
998 break;
999 }
1000 }
1001
1002 if (!found)
1003 specs->misc &= ~FB_MISC_1ST_DETAIL;
1004
1005 DPRINTK("========================================\n");
1006 }
1007
1008 /*
1009 * VESA Generalized Timing Formula (GTF)
1010 */
1011
1012 #define FLYBACK 550
1013 #define V_FRONTPORCH 1
1014 #define H_OFFSET 40
1015 #define H_SCALEFACTOR 20
1016 #define H_BLANKSCALE 128
1017 #define H_GRADIENT 600
1018 #define C_VAL 30
1019 #define M_VAL 300
1020
1021 struct __fb_timings {
1022 u32 dclk;
1023 u32 hfreq;
1024 u32 vfreq;
1025 u32 hactive;
1026 u32 vactive;
1027 u32 hblank;
1028 u32 vblank;
1029 u32 htotal;
1030 u32 vtotal;
1031 };
1032
1033 /**
1034 * fb_get_vblank - get vertical blank time
1035 * @hfreq: horizontal freq
1036 *
1037 * DESCRIPTION:
1038 * vblank = right_margin + vsync_len + left_margin
1039 *
1040 * given: right_margin = 1 (V_FRONTPORCH)
1041 * vsync_len = 3
1042 * flyback = 550
1043 *
1044 * flyback * hfreq
1045 * left_margin = --------------- - vsync_len
1046 * 1000000
1047 */
fb_get_vblank(u32 hfreq)1048 static u32 fb_get_vblank(u32 hfreq)
1049 {
1050 u32 vblank;
1051
1052 vblank = (hfreq * FLYBACK)/1000;
1053 vblank = (vblank + 500)/1000;
1054 return (vblank + V_FRONTPORCH);
1055 }
1056
1057 /**
1058 * fb_get_hblank_by_hfreq - get horizontal blank time given hfreq
1059 * @hfreq: horizontal freq
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/Hfreq)
1070 *
1071 * where: C = ((offset - scale factor) * blank_scale)
1072 * -------------------------------------- + scale factor
1073 * 256
1074 * M = blank_scale * gradient
1075 *
1076 */
fb_get_hblank_by_hfreq(u32 hfreq,u32 xres)1077 static u32 fb_get_hblank_by_hfreq(u32 hfreq, u32 xres)
1078 {
1079 u32 c_val, m_val, duty_cycle, hblank;
1080
1081 c_val = (((H_OFFSET - H_SCALEFACTOR) * H_BLANKSCALE)/256 +
1082 H_SCALEFACTOR) * 1000;
1083 m_val = (H_BLANKSCALE * H_GRADIENT)/256;
1084 m_val = (m_val * 1000000)/hfreq;
1085 duty_cycle = c_val - m_val;
1086 hblank = (xres * duty_cycle)/(100000 - duty_cycle);
1087 return (hblank);
1088 }
1089
1090 /**
1091 * fb_get_hblank_by_dclk - get horizontal blank time given pixelclock
1092 * @dclk: pixelclock in Hz
1093 * @xres: horizontal resolution in pixels
1094 *
1095 * DESCRIPTION:
1096 *
1097 * xres * duty_cycle
1098 * hblank = ------------------
1099 * 100 - duty_cycle
1100 *
1101 * duty cycle = percent of htotal assigned to inactive display
1102 * duty cycle = C - (M * h_period)
1103 *
1104 * where: h_period = SQRT(100 - C + (0.4 * xres * M)/dclk) + C - 100
1105 * -----------------------------------------------
1106 * 2 * M
1107 * M = 300;
1108 * C = 30;
1109 */
fb_get_hblank_by_dclk(u32 dclk,u32 xres)1110 static u32 fb_get_hblank_by_dclk(u32 dclk, u32 xres)
1111 {
1112 u32 duty_cycle, h_period, hblank;
1113
1114 dclk /= 1000;
1115 h_period = 100 - C_VAL;
1116 h_period *= h_period;
1117 h_period += (M_VAL * xres * 2 * 1000)/(5 * dclk);
1118 h_period *= 10000;
1119
1120 h_period = int_sqrt(h_period);
1121 h_period -= (100 - C_VAL) * 100;
1122 h_period *= 1000;
1123 h_period /= 2 * M_VAL;
1124
1125 duty_cycle = C_VAL * 1000 - (M_VAL * h_period)/100;
1126 hblank = (xres * duty_cycle)/(100000 - duty_cycle) + 8;
1127 hblank &= ~15;
1128 return (hblank);
1129 }
1130
1131 /**
1132 * fb_get_hfreq - estimate hsync
1133 * @vfreq: vertical refresh rate
1134 * @yres: vertical resolution
1135 *
1136 * DESCRIPTION:
1137 *
1138 * (yres + front_port) * vfreq * 1000000
1139 * hfreq = -------------------------------------
1140 * (1000000 - (vfreq * FLYBACK)
1141 *
1142 */
1143
fb_get_hfreq(u32 vfreq,u32 yres)1144 static u32 fb_get_hfreq(u32 vfreq, u32 yres)
1145 {
1146 u32 divisor, hfreq;
1147
1148 divisor = (1000000 - (vfreq * FLYBACK))/1000;
1149 hfreq = (yres + V_FRONTPORCH) * vfreq * 1000;
1150 return (hfreq/divisor);
1151 }
1152
fb_timings_vfreq(struct __fb_timings * timings)1153 static void fb_timings_vfreq(struct __fb_timings *timings)
1154 {
1155 timings->hfreq = fb_get_hfreq(timings->vfreq, timings->vactive);
1156 timings->vblank = fb_get_vblank(timings->hfreq);
1157 timings->vtotal = timings->vactive + timings->vblank;
1158 timings->hblank = fb_get_hblank_by_hfreq(timings->hfreq,
1159 timings->hactive);
1160 timings->htotal = timings->hactive + timings->hblank;
1161 timings->dclk = timings->htotal * timings->hfreq;
1162 }
1163
fb_timings_hfreq(struct __fb_timings * timings)1164 static void fb_timings_hfreq(struct __fb_timings *timings)
1165 {
1166 timings->vblank = fb_get_vblank(timings->hfreq);
1167 timings->vtotal = timings->vactive + timings->vblank;
1168 timings->vfreq = timings->hfreq/timings->vtotal;
1169 timings->hblank = fb_get_hblank_by_hfreq(timings->hfreq,
1170 timings->hactive);
1171 timings->htotal = timings->hactive + timings->hblank;
1172 timings->dclk = timings->htotal * timings->hfreq;
1173 }
1174
fb_timings_dclk(struct __fb_timings * timings)1175 static void fb_timings_dclk(struct __fb_timings *timings)
1176 {
1177 timings->hblank = fb_get_hblank_by_dclk(timings->dclk,
1178 timings->hactive);
1179 timings->htotal = timings->hactive + timings->hblank;
1180 timings->hfreq = timings->dclk/timings->htotal;
1181 timings->vblank = fb_get_vblank(timings->hfreq);
1182 timings->vtotal = timings->vactive + timings->vblank;
1183 timings->vfreq = timings->hfreq/timings->vtotal;
1184 }
1185
1186 /*
1187 * fb_get_mode - calculates video mode using VESA GTF
1188 * @flags: if: 0 - maximize vertical refresh rate
1189 * 1 - vrefresh-driven calculation;
1190 * 2 - hscan-driven calculation;
1191 * 3 - pixelclock-driven calculation;
1192 * @val: depending on @flags, ignored, vrefresh, hsync or pixelclock
1193 * @var: pointer to fb_var_screeninfo
1194 * @info: pointer to fb_info
1195 *
1196 * DESCRIPTION:
1197 * Calculates video mode based on monitor specs using VESA GTF.
1198 * The GTF is best for VESA GTF compliant monitors but is
1199 * specifically formulated to work for older monitors as well.
1200 *
1201 * If @flag==0, the function will attempt to maximize the
1202 * refresh rate. Otherwise, it will calculate timings based on
1203 * the flag and accompanying value.
1204 *
1205 * If FB_IGNOREMON bit is set in @flags, monitor specs will be
1206 * ignored and @var will be filled with the calculated timings.
1207 *
1208 * All calculations are based on the VESA GTF Spreadsheet
1209 * available at VESA's public ftp (https://www.vesa.org).
1210 *
1211 * NOTES:
1212 * The timings generated by the GTF will be different from VESA
1213 * DMT. It might be a good idea to keep a table of standard
1214 * VESA modes as well. The GTF may also not work for some displays,
1215 * such as, and especially, analog TV.
1216 *
1217 * REQUIRES:
1218 * A valid info->monspecs, otherwise 'safe numbers' will be used.
1219 */
fb_get_mode(int flags,u32 val,struct fb_var_screeninfo * var,struct fb_info * info)1220 int fb_get_mode(int flags, u32 val, struct fb_var_screeninfo *var, struct fb_info *info)
1221 {
1222 struct __fb_timings *timings;
1223 u32 interlace = 1, dscan = 1;
1224 u32 hfmin, hfmax, vfmin, vfmax, dclkmin, dclkmax, err = 0;
1225
1226
1227 timings = kzalloc_obj(struct __fb_timings);
1228
1229 if (!timings)
1230 return -ENOMEM;
1231
1232 /*
1233 * If monspecs are invalid, use values that are enough
1234 * for 640x480@60
1235 */
1236 if (!info || !info->monspecs.hfmax || !info->monspecs.vfmax ||
1237 !info->monspecs.dclkmax ||
1238 info->monspecs.hfmax < info->monspecs.hfmin ||
1239 info->monspecs.vfmax < info->monspecs.vfmin ||
1240 info->monspecs.dclkmax < info->monspecs.dclkmin) {
1241 hfmin = 29000; hfmax = 30000;
1242 vfmin = 60; vfmax = 60;
1243 dclkmin = 0; dclkmax = 25000000;
1244 } else {
1245 hfmin = info->monspecs.hfmin;
1246 hfmax = info->monspecs.hfmax;
1247 vfmin = info->monspecs.vfmin;
1248 vfmax = info->monspecs.vfmax;
1249 dclkmin = info->monspecs.dclkmin;
1250 dclkmax = info->monspecs.dclkmax;
1251 }
1252
1253 timings->hactive = var->xres;
1254 timings->vactive = var->yres;
1255 if (var->vmode & FB_VMODE_INTERLACED) {
1256 timings->vactive /= 2;
1257 interlace = 2;
1258 }
1259 if (var->vmode & FB_VMODE_DOUBLE) {
1260 timings->vactive *= 2;
1261 dscan = 2;
1262 }
1263
1264 switch (flags & ~FB_IGNOREMON) {
1265 case FB_MAXTIMINGS: /* maximize refresh rate */
1266 timings->hfreq = hfmax;
1267 fb_timings_hfreq(timings);
1268 if (timings->vfreq > vfmax) {
1269 timings->vfreq = vfmax;
1270 fb_timings_vfreq(timings);
1271 }
1272 if (timings->dclk > dclkmax) {
1273 timings->dclk = dclkmax;
1274 fb_timings_dclk(timings);
1275 }
1276 break;
1277 case FB_VSYNCTIMINGS: /* vrefresh driven */
1278 timings->vfreq = val;
1279 fb_timings_vfreq(timings);
1280 break;
1281 case FB_HSYNCTIMINGS: /* hsync driven */
1282 timings->hfreq = val;
1283 fb_timings_hfreq(timings);
1284 break;
1285 case FB_DCLKTIMINGS: /* pixelclock driven */
1286 timings->dclk = PICOS2KHZ(val) * 1000;
1287 fb_timings_dclk(timings);
1288 break;
1289 default:
1290 err = -EINVAL;
1291
1292 }
1293
1294 if (err || (!(flags & FB_IGNOREMON) &&
1295 (timings->vfreq < vfmin || timings->vfreq > vfmax ||
1296 timings->hfreq < hfmin || timings->hfreq > hfmax ||
1297 timings->dclk < dclkmin || timings->dclk > dclkmax))) {
1298 err = -EINVAL;
1299 } else {
1300 var->pixclock = KHZ2PICOS(timings->dclk/1000);
1301 var->hsync_len = (timings->htotal * 8)/100;
1302 var->right_margin = (timings->hblank/2) - var->hsync_len;
1303 var->left_margin = timings->hblank - var->right_margin -
1304 var->hsync_len;
1305 var->vsync_len = (3 * interlace)/dscan;
1306 var->lower_margin = (1 * interlace)/dscan;
1307 var->upper_margin = (timings->vblank * interlace)/dscan -
1308 (var->vsync_len + var->lower_margin);
1309 }
1310
1311 kfree(timings);
1312 return err;
1313 }
1314
1315 #ifdef CONFIG_VIDEOMODE_HELPERS
fb_videomode_from_videomode(const struct videomode * vm,struct fb_videomode * fbmode)1316 int fb_videomode_from_videomode(const struct videomode *vm,
1317 struct fb_videomode *fbmode)
1318 {
1319 unsigned int htotal, vtotal, total;
1320
1321 fbmode->xres = vm->hactive;
1322 fbmode->left_margin = vm->hback_porch;
1323 fbmode->right_margin = vm->hfront_porch;
1324 fbmode->hsync_len = vm->hsync_len;
1325
1326 fbmode->yres = vm->vactive;
1327 fbmode->upper_margin = vm->vback_porch;
1328 fbmode->lower_margin = vm->vfront_porch;
1329 fbmode->vsync_len = vm->vsync_len;
1330
1331 /* prevent division by zero in KHZ2PICOS macro */
1332 fbmode->pixclock = vm->pixelclock ?
1333 KHZ2PICOS(vm->pixelclock / 1000) : 0;
1334
1335 fbmode->sync = 0;
1336 fbmode->vmode = 0;
1337 if (vm->flags & DISPLAY_FLAGS_HSYNC_HIGH)
1338 fbmode->sync |= FB_SYNC_HOR_HIGH_ACT;
1339 if (vm->flags & DISPLAY_FLAGS_VSYNC_HIGH)
1340 fbmode->sync |= FB_SYNC_VERT_HIGH_ACT;
1341 if (vm->flags & DISPLAY_FLAGS_INTERLACED)
1342 fbmode->vmode |= FB_VMODE_INTERLACED;
1343 if (vm->flags & DISPLAY_FLAGS_DOUBLESCAN)
1344 fbmode->vmode |= FB_VMODE_DOUBLE;
1345 fbmode->flag = 0;
1346
1347 htotal = vm->hactive + vm->hfront_porch + vm->hback_porch +
1348 vm->hsync_len;
1349 vtotal = vm->vactive + vm->vfront_porch + vm->vback_porch +
1350 vm->vsync_len;
1351 /* prevent division by zero */
1352 total = htotal * vtotal;
1353 if (total) {
1354 fbmode->refresh = vm->pixelclock / total;
1355 /* a mode must have htotal and vtotal != 0 or it is invalid */
1356 } else {
1357 fbmode->refresh = 0;
1358 return -EINVAL;
1359 }
1360
1361 return 0;
1362 }
1363 EXPORT_SYMBOL_GPL(fb_videomode_from_videomode);
1364
1365 #ifdef CONFIG_OF
dump_fb_videomode(const struct fb_videomode * m)1366 static inline void dump_fb_videomode(const struct fb_videomode *m)
1367 {
1368 pr_debug("fb_videomode = %ux%u@%uHz (%ukHz) %u %u %u %u %u %u %u %u %u\n",
1369 m->xres, m->yres, m->refresh, m->pixclock, m->left_margin,
1370 m->right_margin, m->upper_margin, m->lower_margin,
1371 m->hsync_len, m->vsync_len, m->sync, m->vmode, m->flag);
1372 }
1373
1374 /**
1375 * of_get_fb_videomode - get a fb_videomode from devicetree
1376 * @np: device_node with the timing specification
1377 * @fb: will be set to the return value
1378 * @index: index into the list of display timings in devicetree
1379 *
1380 * DESCRIPTION:
1381 * This function is expensive and should only be used, if only one mode is to be
1382 * read from DT. To get multiple modes start with of_get_display_timings ond
1383 * work with that instead.
1384 */
of_get_fb_videomode(struct device_node * np,struct fb_videomode * fb,int index)1385 int of_get_fb_videomode(struct device_node *np, struct fb_videomode *fb,
1386 int index)
1387 {
1388 struct videomode vm;
1389 int ret;
1390
1391 ret = of_get_videomode(np, &vm, index);
1392 if (ret)
1393 return ret;
1394
1395 ret = fb_videomode_from_videomode(&vm, fb);
1396 if (ret)
1397 return ret;
1398
1399 pr_debug("%pOF: got %dx%d display mode\n",
1400 np, vm.hactive, vm.vactive);
1401 dump_fb_videomode(fb);
1402
1403 return 0;
1404 }
1405 EXPORT_SYMBOL_GPL(of_get_fb_videomode);
1406 #endif /* CONFIG_OF */
1407 #endif /* CONFIG_VIDEOMODE_HELPERS */
1408
1409 #else
fb_parse_edid(unsigned char * edid,struct fb_var_screeninfo * var)1410 int fb_parse_edid(unsigned char *edid, struct fb_var_screeninfo *var)
1411 {
1412 return 1;
1413 }
fb_edid_to_monspecs(unsigned char * edid,struct fb_monspecs * specs)1414 void fb_edid_to_monspecs(unsigned char *edid, struct fb_monspecs *specs)
1415 {
1416 }
fb_destroy_modedb(struct fb_videomode * modedb)1417 void fb_destroy_modedb(struct fb_videomode *modedb)
1418 {
1419 }
fb_get_mode(int flags,u32 val,struct fb_var_screeninfo * var,struct fb_info * info)1420 int fb_get_mode(int flags, u32 val, struct fb_var_screeninfo *var,
1421 struct fb_info *info)
1422 {
1423 return -EINVAL;
1424 }
1425 #endif /* CONFIG_FB_MODE_HELPERS */
1426
1427 /*
1428 * fb_validate_mode - validates var against monitor capabilities
1429 * @var: pointer to fb_var_screeninfo
1430 * @info: pointer to fb_info
1431 *
1432 * DESCRIPTION:
1433 * Validates video mode against monitor capabilities specified in
1434 * info->monspecs.
1435 *
1436 * REQUIRES:
1437 * A valid info->monspecs.
1438 */
fb_validate_mode(const struct fb_var_screeninfo * var,struct fb_info * info)1439 int fb_validate_mode(const struct fb_var_screeninfo *var, struct fb_info *info)
1440 {
1441 u32 hfreq, vfreq, htotal, vtotal, pixclock;
1442 u32 hfmin, hfmax, vfmin, vfmax, dclkmin, dclkmax;
1443
1444 /*
1445 * If monspecs are invalid, use values that are enough
1446 * for 640x480@60
1447 */
1448 if (!info->monspecs.hfmax || !info->monspecs.vfmax ||
1449 !info->monspecs.dclkmax ||
1450 info->monspecs.hfmax < info->monspecs.hfmin ||
1451 info->monspecs.vfmax < info->monspecs.vfmin ||
1452 info->monspecs.dclkmax < info->monspecs.dclkmin) {
1453 hfmin = 29000; hfmax = 30000;
1454 vfmin = 60; vfmax = 60;
1455 dclkmin = 0; dclkmax = 25000000;
1456 } else {
1457 hfmin = info->monspecs.hfmin;
1458 hfmax = info->monspecs.hfmax;
1459 vfmin = info->monspecs.vfmin;
1460 vfmax = info->monspecs.vfmax;
1461 dclkmin = info->monspecs.dclkmin;
1462 dclkmax = info->monspecs.dclkmax;
1463 }
1464
1465 if (!var->pixclock)
1466 return -EINVAL;
1467 pixclock = PICOS2KHZ(var->pixclock) * 1000;
1468
1469 htotal = var->xres + var->right_margin + var->hsync_len +
1470 var->left_margin;
1471 vtotal = var->yres + var->lower_margin + var->vsync_len +
1472 var->upper_margin;
1473
1474 if (var->vmode & FB_VMODE_INTERLACED)
1475 vtotal /= 2;
1476 if (var->vmode & FB_VMODE_DOUBLE)
1477 vtotal *= 2;
1478
1479 hfreq = pixclock/htotal;
1480 hfreq = (hfreq + 500) / 1000 * 1000;
1481
1482 vfreq = hfreq/vtotal;
1483
1484 return (vfreq < vfmin || vfreq > vfmax ||
1485 hfreq < hfmin || hfreq > hfmax ||
1486 pixclock < dclkmin || pixclock > dclkmax) ?
1487 -EINVAL : 0;
1488 }
1489
1490 /*
1491 * We need to ensure that the EDID block is only returned for
1492 * the primary graphics adapter.
1493 */
1494
1495 #if defined(CONFIG_FIRMWARE_EDID)
fb_firmware_edid(struct device * device)1496 const unsigned char *fb_firmware_edid(struct device *device)
1497 {
1498 struct pci_dev *dev = NULL;
1499 struct resource *res = NULL;
1500 unsigned char *edid = NULL;
1501
1502 if (device)
1503 dev = to_pci_dev(device);
1504
1505 if (dev)
1506 res = &dev->resource[PCI_ROM_RESOURCE];
1507
1508 if (res && res->flags & IORESOURCE_ROM_SHADOW)
1509 edid = sysfb_primary_display.edid.dummy;
1510
1511 return edid;
1512 }
1513 #else
fb_firmware_edid(struct device * device)1514 const unsigned char *fb_firmware_edid(struct device *device)
1515 {
1516 return NULL;
1517 }
1518 #endif
1519 EXPORT_SYMBOL(fb_firmware_edid);
1520
1521 EXPORT_SYMBOL(fb_parse_edid);
1522 EXPORT_SYMBOL(fb_edid_to_monspecs);
1523 EXPORT_SYMBOL(fb_get_mode);
1524 EXPORT_SYMBOL(fb_validate_mode);
1525 EXPORT_SYMBOL(fb_destroy_modedb);
1526