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 #include <video/of_videomode.h>
35 #include <video/videomode.h>
36 #ifdef CONFIG_PPC_OF
37 #include <asm/prom.h>
38 #include <asm/pci-bridge.h>
39 #endif
40 #include "../edid.h"
41
42 /*
43 * EDID parser
44 */
45
46 #undef DEBUG /* define this for verbose EDID parsing output */
47
48 #ifdef DEBUG
49 #define DPRINTK(fmt, args...) printk(fmt,## args)
50 #else
51 #define DPRINTK(fmt, args...)
52 #endif
53
54 #define FBMON_FIX_HEADER 1
55 #define FBMON_FIX_INPUT 2
56 #define FBMON_FIX_TIMINGS 3
57
58 #ifdef CONFIG_FB_MODE_HELPERS
59 struct broken_edid {
60 u8 manufacturer[4];
61 u32 model;
62 u32 fix;
63 };
64
65 static const struct broken_edid brokendb[] = {
66 /* DEC FR-PCXAV-YZ */
67 {
68 .manufacturer = "DEC",
69 .model = 0x073a,
70 .fix = FBMON_FIX_HEADER,
71 },
72 /* ViewSonic PF775a */
73 {
74 .manufacturer = "VSC",
75 .model = 0x5a44,
76 .fix = FBMON_FIX_INPUT,
77 },
78 /* Sharp UXGA? */
79 {
80 .manufacturer = "SHP",
81 .model = 0x138e,
82 .fix = FBMON_FIX_TIMINGS,
83 },
84 };
85
86 static const unsigned char edid_v1_header[] = { 0x00, 0xff, 0xff, 0xff,
87 0xff, 0xff, 0xff, 0x00
88 };
89
copy_string(unsigned char * c,unsigned char * s)90 static void copy_string(unsigned char *c, unsigned char *s)
91 {
92 int i;
93 c = c + 5;
94 for (i = 0; (i < 13 && *c != 0x0A); i++)
95 *(s++) = *(c++);
96 *s = 0;
97 while (i-- && (*--s == 0x20)) *s = 0;
98 }
99
edid_is_serial_block(unsigned char * block)100 static int edid_is_serial_block(unsigned char *block)
101 {
102 if ((block[0] == 0x00) && (block[1] == 0x00) &&
103 (block[2] == 0x00) && (block[3] == 0xff) &&
104 (block[4] == 0x00))
105 return 1;
106 else
107 return 0;
108 }
109
edid_is_ascii_block(unsigned char * block)110 static int edid_is_ascii_block(unsigned char *block)
111 {
112 if ((block[0] == 0x00) && (block[1] == 0x00) &&
113 (block[2] == 0x00) && (block[3] == 0xfe) &&
114 (block[4] == 0x00))
115 return 1;
116 else
117 return 0;
118 }
119
edid_is_limits_block(unsigned char * block)120 static int edid_is_limits_block(unsigned char *block)
121 {
122 if ((block[0] == 0x00) && (block[1] == 0x00) &&
123 (block[2] == 0x00) && (block[3] == 0xfd) &&
124 (block[4] == 0x00))
125 return 1;
126 else
127 return 0;
128 }
129
edid_is_monitor_block(unsigned char * block)130 static int edid_is_monitor_block(unsigned char *block)
131 {
132 if ((block[0] == 0x00) && (block[1] == 0x00) &&
133 (block[2] == 0x00) && (block[3] == 0xfc) &&
134 (block[4] == 0x00))
135 return 1;
136 else
137 return 0;
138 }
139
edid_is_timing_block(unsigned char * block)140 static int edid_is_timing_block(unsigned char *block)
141 {
142 if ((block[0] != 0x00) || (block[1] != 0x00) ||
143 (block[2] != 0x00) || (block[4] != 0x00))
144 return 1;
145 else
146 return 0;
147 }
148
check_edid(unsigned char * edid)149 static int check_edid(unsigned char *edid)
150 {
151 unsigned char *block = edid + ID_MANUFACTURER_NAME, manufacturer[4];
152 unsigned char *b;
153 u32 model;
154 int i, fix = 0, ret = 0;
155
156 manufacturer[0] = ((block[0] & 0x7c) >> 2) + '@';
157 manufacturer[1] = ((block[0] & 0x03) << 3) +
158 ((block[1] & 0xe0) >> 5) + '@';
159 manufacturer[2] = (block[1] & 0x1f) + '@';
160 manufacturer[3] = 0;
161 model = block[2] + (block[3] << 8);
162
163 for (i = 0; i < ARRAY_SIZE(brokendb); i++) {
164 if (!strncmp(manufacturer, brokendb[i].manufacturer, 4) &&
165 brokendb[i].model == model) {
166 fix = brokendb[i].fix;
167 break;
168 }
169 }
170
171 switch (fix) {
172 case FBMON_FIX_HEADER:
173 for (i = 0; i < 8; i++) {
174 if (edid[i] != edid_v1_header[i]) {
175 ret = fix;
176 break;
177 }
178 }
179 break;
180 case FBMON_FIX_INPUT:
181 b = edid + EDID_STRUCT_DISPLAY;
182 /* Only if display is GTF capable will
183 the input type be reset to analog */
184 if (b[4] & 0x01 && b[0] & 0x80)
185 ret = fix;
186 break;
187 case FBMON_FIX_TIMINGS:
188 b = edid + DETAILED_TIMING_DESCRIPTIONS_START;
189 ret = fix;
190
191 for (i = 0; i < 4; i++) {
192 if (edid_is_limits_block(b)) {
193 ret = 0;
194 break;
195 }
196
197 b += DETAILED_TIMING_DESCRIPTION_SIZE;
198 }
199
200 break;
201 }
202
203 if (ret)
204 printk("fbmon: The EDID Block of "
205 "Manufacturer: %s Model: 0x%x is known to "
206 "be broken,\n", manufacturer, model);
207
208 return ret;
209 }
210
fix_edid(unsigned char * edid,int fix)211 static void fix_edid(unsigned char *edid, int fix)
212 {
213 int i;
214 unsigned char *b, csum = 0;
215
216 switch (fix) {
217 case FBMON_FIX_HEADER:
218 printk("fbmon: trying a header reconstruct\n");
219 memcpy(edid, edid_v1_header, 8);
220 break;
221 case FBMON_FIX_INPUT:
222 printk("fbmon: trying to fix input type\n");
223 b = edid + EDID_STRUCT_DISPLAY;
224 b[0] &= ~0x80;
225 edid[127] += 0x80;
226 break;
227 case FBMON_FIX_TIMINGS:
228 printk("fbmon: trying to fix monitor timings\n");
229 b = edid + DETAILED_TIMING_DESCRIPTIONS_START;
230 for (i = 0; i < 4; i++) {
231 if (!(edid_is_serial_block(b) ||
232 edid_is_ascii_block(b) ||
233 edid_is_monitor_block(b) ||
234 edid_is_timing_block(b))) {
235 b[0] = 0x00;
236 b[1] = 0x00;
237 b[2] = 0x00;
238 b[3] = 0xfd;
239 b[4] = 0x00;
240 b[5] = 60; /* vfmin */
241 b[6] = 60; /* vfmax */
242 b[7] = 30; /* hfmin */
243 b[8] = 75; /* hfmax */
244 b[9] = 17; /* pixclock - 170 MHz*/
245 b[10] = 0; /* GTF */
246 break;
247 }
248
249 b += DETAILED_TIMING_DESCRIPTION_SIZE;
250 }
251
252 for (i = 0; i < EDID_LENGTH - 1; i++)
253 csum += edid[i];
254
255 edid[127] = 256 - csum;
256 break;
257 }
258 }
259
edid_checksum(unsigned char * edid)260 static int edid_checksum(unsigned char *edid)
261 {
262 unsigned char csum = 0, all_null = 0;
263 int i, err = 0, fix = check_edid(edid);
264
265 if (fix)
266 fix_edid(edid, fix);
267
268 for (i = 0; i < EDID_LENGTH; i++) {
269 csum += edid[i];
270 all_null |= edid[i];
271 }
272
273 if (csum == 0x00 && all_null) {
274 /* checksum passed, everything's good */
275 err = 1;
276 }
277
278 return err;
279 }
280
edid_check_header(unsigned char * edid)281 static int edid_check_header(unsigned char *edid)
282 {
283 int i, err = 1, fix = check_edid(edid);
284
285 if (fix)
286 fix_edid(edid, fix);
287
288 for (i = 0; i < 8; i++) {
289 if (edid[i] != edid_v1_header[i])
290 err = 0;
291 }
292
293 return err;
294 }
295
parse_vendor_block(unsigned char * block,struct fb_monspecs * specs)296 static void parse_vendor_block(unsigned char *block, struct fb_monspecs *specs)
297 {
298 specs->manufacturer[0] = ((block[0] & 0x7c) >> 2) + '@';
299 specs->manufacturer[1] = ((block[0] & 0x03) << 3) +
300 ((block[1] & 0xe0) >> 5) + '@';
301 specs->manufacturer[2] = (block[1] & 0x1f) + '@';
302 specs->manufacturer[3] = 0;
303 specs->model = block[2] + (block[3] << 8);
304 specs->serial = block[4] + (block[5] << 8) +
305 (block[6] << 16) + (block[7] << 24);
306 specs->year = block[9] + 1990;
307 specs->week = block[8];
308 DPRINTK(" Manufacturer: %s\n", specs->manufacturer);
309 DPRINTK(" Model: %x\n", specs->model);
310 DPRINTK(" Serial#: %u\n", specs->serial);
311 DPRINTK(" Year: %u Week %u\n", specs->year, specs->week);
312 }
313
get_dpms_capabilities(unsigned char flags,struct fb_monspecs * specs)314 static void get_dpms_capabilities(unsigned char flags,
315 struct fb_monspecs *specs)
316 {
317 specs->dpms = 0;
318 if (flags & DPMS_ACTIVE_OFF)
319 specs->dpms |= FB_DPMS_ACTIVE_OFF;
320 if (flags & DPMS_SUSPEND)
321 specs->dpms |= FB_DPMS_SUSPEND;
322 if (flags & DPMS_STANDBY)
323 specs->dpms |= FB_DPMS_STANDBY;
324 DPRINTK(" DPMS: Active %s, Suspend %s, Standby %s\n",
325 (flags & DPMS_ACTIVE_OFF) ? "yes" : "no",
326 (flags & DPMS_SUSPEND) ? "yes" : "no",
327 (flags & DPMS_STANDBY) ? "yes" : "no");
328 }
329
get_chroma(unsigned char * block,struct fb_monspecs * specs)330 static void get_chroma(unsigned char *block, struct fb_monspecs *specs)
331 {
332 int tmp;
333
334 DPRINTK(" Chroma\n");
335 /* Chromaticity data */
336 tmp = ((block[5] & (3 << 6)) >> 6) | (block[0x7] << 2);
337 tmp *= 1000;
338 tmp += 512;
339 specs->chroma.redx = tmp/1024;
340 DPRINTK(" RedX: 0.%03d ", specs->chroma.redx);
341
342 tmp = ((block[5] & (3 << 4)) >> 4) | (block[0x8] << 2);
343 tmp *= 1000;
344 tmp += 512;
345 specs->chroma.redy = tmp/1024;
346 DPRINTK("RedY: 0.%03d\n", specs->chroma.redy);
347
348 tmp = ((block[5] & (3 << 2)) >> 2) | (block[0x9] << 2);
349 tmp *= 1000;
350 tmp += 512;
351 specs->chroma.greenx = tmp/1024;
352 DPRINTK(" GreenX: 0.%03d ", specs->chroma.greenx);
353
354 tmp = (block[5] & 3) | (block[0xa] << 2);
355 tmp *= 1000;
356 tmp += 512;
357 specs->chroma.greeny = tmp/1024;
358 DPRINTK("GreenY: 0.%03d\n", specs->chroma.greeny);
359
360 tmp = ((block[6] & (3 << 6)) >> 6) | (block[0xb] << 2);
361 tmp *= 1000;
362 tmp += 512;
363 specs->chroma.bluex = tmp/1024;
364 DPRINTK(" BlueX: 0.%03d ", specs->chroma.bluex);
365
366 tmp = ((block[6] & (3 << 4)) >> 4) | (block[0xc] << 2);
367 tmp *= 1000;
368 tmp += 512;
369 specs->chroma.bluey = tmp/1024;
370 DPRINTK("BlueY: 0.%03d\n", specs->chroma.bluey);
371
372 tmp = ((block[6] & (3 << 2)) >> 2) | (block[0xd] << 2);
373 tmp *= 1000;
374 tmp += 512;
375 specs->chroma.whitex = tmp/1024;
376 DPRINTK(" WhiteX: 0.%03d ", specs->chroma.whitex);
377
378 tmp = (block[6] & 3) | (block[0xe] << 2);
379 tmp *= 1000;
380 tmp += 512;
381 specs->chroma.whitey = tmp/1024;
382 DPRINTK("WhiteY: 0.%03d\n", specs->chroma.whitey);
383 }
384
calc_mode_timings(int xres,int yres,int refresh,struct fb_videomode * mode)385 static void calc_mode_timings(int xres, int yres, int refresh,
386 struct fb_videomode *mode)
387 {
388 struct fb_var_screeninfo *var;
389
390 var = kzalloc(sizeof(struct fb_var_screeninfo), GFP_KERNEL);
391
392 if (var) {
393 var->xres = xres;
394 var->yres = yres;
395 fb_get_mode(FB_VSYNCTIMINGS | FB_IGNOREMON,
396 refresh, var, NULL);
397 mode->xres = xres;
398 mode->yres = yres;
399 mode->pixclock = var->pixclock;
400 mode->refresh = refresh;
401 mode->left_margin = var->left_margin;
402 mode->right_margin = var->right_margin;
403 mode->upper_margin = var->upper_margin;
404 mode->lower_margin = var->lower_margin;
405 mode->hsync_len = var->hsync_len;
406 mode->vsync_len = var->vsync_len;
407 mode->vmode = 0;
408 mode->sync = 0;
409 kfree(var);
410 }
411 }
412
get_est_timing(unsigned char * block,struct fb_videomode * mode)413 static int get_est_timing(unsigned char *block, struct fb_videomode *mode)
414 {
415 int num = 0;
416 unsigned char c;
417
418 c = block[0];
419 if (c&0x80) {
420 calc_mode_timings(720, 400, 70, &mode[num]);
421 mode[num++].flag = FB_MODE_IS_CALCULATED;
422 DPRINTK(" 720x400@70Hz\n");
423 }
424 if (c&0x40) {
425 calc_mode_timings(720, 400, 88, &mode[num]);
426 mode[num++].flag = FB_MODE_IS_CALCULATED;
427 DPRINTK(" 720x400@88Hz\n");
428 }
429 if (c&0x20) {
430 mode[num++] = vesa_modes[3];
431 DPRINTK(" 640x480@60Hz\n");
432 }
433 if (c&0x10) {
434 calc_mode_timings(640, 480, 67, &mode[num]);
435 mode[num++].flag = FB_MODE_IS_CALCULATED;
436 DPRINTK(" 640x480@67Hz\n");
437 }
438 if (c&0x08) {
439 mode[num++] = vesa_modes[4];
440 DPRINTK(" 640x480@72Hz\n");
441 }
442 if (c&0x04) {
443 mode[num++] = vesa_modes[5];
444 DPRINTK(" 640x480@75Hz\n");
445 }
446 if (c&0x02) {
447 mode[num++] = vesa_modes[7];
448 DPRINTK(" 800x600@56Hz\n");
449 }
450 if (c&0x01) {
451 mode[num++] = vesa_modes[8];
452 DPRINTK(" 800x600@60Hz\n");
453 }
454
455 c = block[1];
456 if (c&0x80) {
457 mode[num++] = vesa_modes[9];
458 DPRINTK(" 800x600@72Hz\n");
459 }
460 if (c&0x40) {
461 mode[num++] = vesa_modes[10];
462 DPRINTK(" 800x600@75Hz\n");
463 }
464 if (c&0x20) {
465 calc_mode_timings(832, 624, 75, &mode[num]);
466 mode[num++].flag = FB_MODE_IS_CALCULATED;
467 DPRINTK(" 832x624@75Hz\n");
468 }
469 if (c&0x10) {
470 mode[num++] = vesa_modes[12];
471 DPRINTK(" 1024x768@87Hz Interlaced\n");
472 }
473 if (c&0x08) {
474 mode[num++] = vesa_modes[13];
475 DPRINTK(" 1024x768@60Hz\n");
476 }
477 if (c&0x04) {
478 mode[num++] = vesa_modes[14];
479 DPRINTK(" 1024x768@70Hz\n");
480 }
481 if (c&0x02) {
482 mode[num++] = vesa_modes[15];
483 DPRINTK(" 1024x768@75Hz\n");
484 }
485 if (c&0x01) {
486 mode[num++] = vesa_modes[21];
487 DPRINTK(" 1280x1024@75Hz\n");
488 }
489 c = block[2];
490 if (c&0x80) {
491 mode[num++] = vesa_modes[17];
492 DPRINTK(" 1152x870@75Hz\n");
493 }
494 DPRINTK(" Manufacturer's mask: %x\n",c&0x7F);
495 return num;
496 }
497
get_std_timing(unsigned char * block,struct fb_videomode * mode,int ver,int rev)498 static int get_std_timing(unsigned char *block, struct fb_videomode *mode,
499 int ver, int rev)
500 {
501 int xres, yres = 0, refresh, ratio, i;
502
503 xres = (block[0] + 31) * 8;
504 if (xres <= 256)
505 return 0;
506
507 ratio = (block[1] & 0xc0) >> 6;
508 switch (ratio) {
509 case 0:
510 /* in EDID 1.3 the meaning of 0 changed to 16:10 (prior 1:1) */
511 if (ver < 1 || (ver == 1 && rev < 3))
512 yres = xres;
513 else
514 yres = (xres * 10)/16;
515 break;
516 case 1:
517 yres = (xres * 3)/4;
518 break;
519 case 2:
520 yres = (xres * 4)/5;
521 break;
522 case 3:
523 yres = (xres * 9)/16;
524 break;
525 }
526 refresh = (block[1] & 0x3f) + 60;
527
528 DPRINTK(" %dx%d@%dHz\n", xres, yres, refresh);
529 for (i = 0; i < VESA_MODEDB_SIZE; i++) {
530 if (vesa_modes[i].xres == xres &&
531 vesa_modes[i].yres == yres &&
532 vesa_modes[i].refresh == refresh) {
533 *mode = vesa_modes[i];
534 mode->flag |= FB_MODE_IS_STANDARD;
535 return 1;
536 }
537 }
538 calc_mode_timings(xres, yres, refresh, mode);
539 return 1;
540 }
541
get_dst_timing(unsigned char * block,struct fb_videomode * mode,int ver,int rev)542 static int get_dst_timing(unsigned char *block,
543 struct fb_videomode *mode, int ver, int rev)
544 {
545 int j, num = 0;
546
547 for (j = 0; j < 6; j++, block += STD_TIMING_DESCRIPTION_SIZE)
548 num += get_std_timing(block, &mode[num], ver, rev);
549
550 return num;
551 }
552
get_detailed_timing(unsigned char * block,struct fb_videomode * mode)553 static void get_detailed_timing(unsigned char *block,
554 struct fb_videomode *mode)
555 {
556 mode->xres = H_ACTIVE;
557 mode->yres = V_ACTIVE;
558 mode->pixclock = PIXEL_CLOCK;
559 mode->pixclock /= 1000;
560 mode->pixclock = KHZ2PICOS(mode->pixclock);
561 mode->right_margin = H_SYNC_OFFSET;
562 mode->left_margin = (H_ACTIVE + H_BLANKING) -
563 (H_ACTIVE + H_SYNC_OFFSET + H_SYNC_WIDTH);
564 mode->upper_margin = V_BLANKING - V_SYNC_OFFSET -
565 V_SYNC_WIDTH;
566 mode->lower_margin = V_SYNC_OFFSET;
567 mode->hsync_len = H_SYNC_WIDTH;
568 mode->vsync_len = V_SYNC_WIDTH;
569 if (HSYNC_POSITIVE)
570 mode->sync |= FB_SYNC_HOR_HIGH_ACT;
571 if (VSYNC_POSITIVE)
572 mode->sync |= FB_SYNC_VERT_HIGH_ACT;
573 mode->refresh = PIXEL_CLOCK/((H_ACTIVE + H_BLANKING) *
574 (V_ACTIVE + V_BLANKING));
575 if (INTERLACED) {
576 mode->yres *= 2;
577 mode->upper_margin *= 2;
578 mode->lower_margin *= 2;
579 mode->vsync_len *= 2;
580 mode->vmode |= FB_VMODE_INTERLACED;
581 }
582 mode->flag = FB_MODE_IS_DETAILED;
583
584 DPRINTK(" %d MHz ", PIXEL_CLOCK/1000000);
585 DPRINTK("%d %d %d %d ", H_ACTIVE, H_ACTIVE + H_SYNC_OFFSET,
586 H_ACTIVE + H_SYNC_OFFSET + H_SYNC_WIDTH, H_ACTIVE + H_BLANKING);
587 DPRINTK("%d %d %d %d ", V_ACTIVE, V_ACTIVE + V_SYNC_OFFSET,
588 V_ACTIVE + V_SYNC_OFFSET + V_SYNC_WIDTH, V_ACTIVE + V_BLANKING);
589 DPRINTK("%sHSync %sVSync\n\n", (HSYNC_POSITIVE) ? "+" : "-",
590 (VSYNC_POSITIVE) ? "+" : "-");
591 }
592
593 /**
594 * fb_create_modedb - create video mode database
595 * @edid: EDID data
596 * @dbsize: database size
597 *
598 * RETURNS: struct fb_videomode, @dbsize contains length of database
599 *
600 * DESCRIPTION:
601 * This function builds a mode database using the contents of the EDID
602 * data
603 */
fb_create_modedb(unsigned char * edid,int * dbsize)604 static struct fb_videomode *fb_create_modedb(unsigned char *edid, int *dbsize)
605 {
606 struct fb_videomode *mode, *m;
607 unsigned char *block;
608 int num = 0, i, first = 1;
609 int ver, rev;
610
611 ver = edid[EDID_STRUCT_VERSION];
612 rev = edid[EDID_STRUCT_REVISION];
613
614 mode = kzalloc(50 * sizeof(struct fb_videomode), GFP_KERNEL);
615 if (mode == NULL)
616 return NULL;
617
618 if (edid == NULL || !edid_checksum(edid) ||
619 !edid_check_header(edid)) {
620 kfree(mode);
621 return NULL;
622 }
623
624 *dbsize = 0;
625
626 DPRINTK(" Detailed Timings\n");
627 block = edid + DETAILED_TIMING_DESCRIPTIONS_START;
628 for (i = 0; i < 4; i++, block+= DETAILED_TIMING_DESCRIPTION_SIZE) {
629 if (!(block[0] == 0x00 && block[1] == 0x00)) {
630 get_detailed_timing(block, &mode[num]);
631 if (first) {
632 mode[num].flag |= FB_MODE_IS_FIRST;
633 first = 0;
634 }
635 num++;
636 }
637 }
638
639 DPRINTK(" Supported VESA Modes\n");
640 block = edid + ESTABLISHED_TIMING_1;
641 num += get_est_timing(block, &mode[num]);
642
643 DPRINTK(" Standard Timings\n");
644 block = edid + STD_TIMING_DESCRIPTIONS_START;
645 for (i = 0; i < STD_TIMING; i++, block += STD_TIMING_DESCRIPTION_SIZE)
646 num += get_std_timing(block, &mode[num], ver, rev);
647
648 block = edid + DETAILED_TIMING_DESCRIPTIONS_START;
649 for (i = 0; i < 4; i++, block+= DETAILED_TIMING_DESCRIPTION_SIZE) {
650 if (block[0] == 0x00 && block[1] == 0x00 && block[3] == 0xfa)
651 num += get_dst_timing(block + 5, &mode[num], ver, rev);
652 }
653
654 /* Yikes, EDID data is totally useless */
655 if (!num) {
656 kfree(mode);
657 return NULL;
658 }
659
660 *dbsize = num;
661 m = kmalloc(num * sizeof(struct fb_videomode), GFP_KERNEL);
662 if (!m)
663 return mode;
664 memmove(m, mode, num * sizeof(struct fb_videomode));
665 kfree(mode);
666 return m;
667 }
668
669 /**
670 * fb_destroy_modedb - destroys mode database
671 * @modedb: mode database to destroy
672 *
673 * DESCRIPTION:
674 * Destroy mode database created by fb_create_modedb
675 */
fb_destroy_modedb(struct fb_videomode * modedb)676 void fb_destroy_modedb(struct fb_videomode *modedb)
677 {
678 kfree(modedb);
679 }
680
fb_get_monitor_limits(unsigned char * edid,struct fb_monspecs * specs)681 static int fb_get_monitor_limits(unsigned char *edid, struct fb_monspecs *specs)
682 {
683 int i, retval = 1;
684 unsigned char *block;
685
686 block = edid + DETAILED_TIMING_DESCRIPTIONS_START;
687
688 DPRINTK(" Monitor Operating Limits: ");
689
690 for (i = 0; i < 4; i++, block += DETAILED_TIMING_DESCRIPTION_SIZE) {
691 if (edid_is_limits_block(block)) {
692 specs->hfmin = H_MIN_RATE * 1000;
693 specs->hfmax = H_MAX_RATE * 1000;
694 specs->vfmin = V_MIN_RATE;
695 specs->vfmax = V_MAX_RATE;
696 specs->dclkmax = MAX_PIXEL_CLOCK * 1000000;
697 specs->gtf = (GTF_SUPPORT) ? 1 : 0;
698 retval = 0;
699 DPRINTK("From EDID\n");
700 break;
701 }
702 }
703
704 /* estimate monitor limits based on modes supported */
705 if (retval) {
706 struct fb_videomode *modes, *mode;
707 int num_modes, hz, hscan, pixclock;
708 int vtotal, htotal;
709
710 modes = fb_create_modedb(edid, &num_modes);
711 if (!modes) {
712 DPRINTK("None Available\n");
713 return 1;
714 }
715
716 retval = 0;
717 for (i = 0; i < num_modes; i++) {
718 mode = &modes[i];
719 pixclock = PICOS2KHZ(modes[i].pixclock) * 1000;
720 htotal = mode->xres + mode->right_margin + mode->hsync_len
721 + mode->left_margin;
722 vtotal = mode->yres + mode->lower_margin + mode->vsync_len
723 + mode->upper_margin;
724
725 if (mode->vmode & FB_VMODE_INTERLACED)
726 vtotal /= 2;
727
728 if (mode->vmode & FB_VMODE_DOUBLE)
729 vtotal *= 2;
730
731 hscan = (pixclock + htotal / 2) / htotal;
732 hscan = (hscan + 500) / 1000 * 1000;
733 hz = (hscan + vtotal / 2) / vtotal;
734
735 if (specs->dclkmax == 0 || specs->dclkmax < pixclock)
736 specs->dclkmax = pixclock;
737
738 if (specs->dclkmin == 0 || specs->dclkmin > pixclock)
739 specs->dclkmin = pixclock;
740
741 if (specs->hfmax == 0 || specs->hfmax < hscan)
742 specs->hfmax = hscan;
743
744 if (specs->hfmin == 0 || specs->hfmin > hscan)
745 specs->hfmin = hscan;
746
747 if (specs->vfmax == 0 || specs->vfmax < hz)
748 specs->vfmax = hz;
749
750 if (specs->vfmin == 0 || specs->vfmin > hz)
751 specs->vfmin = hz;
752 }
753 DPRINTK("Extrapolated\n");
754 fb_destroy_modedb(modes);
755 }
756 DPRINTK(" H: %d-%dKHz V: %d-%dHz DCLK: %dMHz\n",
757 specs->hfmin/1000, specs->hfmax/1000, specs->vfmin,
758 specs->vfmax, specs->dclkmax/1000000);
759 return retval;
760 }
761
get_monspecs(unsigned char * edid,struct fb_monspecs * specs)762 static void get_monspecs(unsigned char *edid, struct fb_monspecs *specs)
763 {
764 unsigned char c, *block;
765
766 block = edid + EDID_STRUCT_DISPLAY;
767
768 fb_get_monitor_limits(edid, specs);
769
770 c = block[0] & 0x80;
771 specs->input = 0;
772 if (c) {
773 specs->input |= FB_DISP_DDI;
774 DPRINTK(" Digital Display Input");
775 } else {
776 DPRINTK(" Analog Display Input: Input Voltage - ");
777 switch ((block[0] & 0x60) >> 5) {
778 case 0:
779 DPRINTK("0.700V/0.300V");
780 specs->input |= FB_DISP_ANA_700_300;
781 break;
782 case 1:
783 DPRINTK("0.714V/0.286V");
784 specs->input |= FB_DISP_ANA_714_286;
785 break;
786 case 2:
787 DPRINTK("1.000V/0.400V");
788 specs->input |= FB_DISP_ANA_1000_400;
789 break;
790 case 3:
791 DPRINTK("0.700V/0.000V");
792 specs->input |= FB_DISP_ANA_700_000;
793 break;
794 }
795 }
796 DPRINTK("\n Sync: ");
797 c = block[0] & 0x10;
798 if (c)
799 DPRINTK(" Configurable signal level\n");
800 c = block[0] & 0x0f;
801 specs->signal = 0;
802 if (c & 0x10) {
803 DPRINTK("Blank to Blank ");
804 specs->signal |= FB_SIGNAL_BLANK_BLANK;
805 }
806 if (c & 0x08) {
807 DPRINTK("Separate ");
808 specs->signal |= FB_SIGNAL_SEPARATE;
809 }
810 if (c & 0x04) {
811 DPRINTK("Composite ");
812 specs->signal |= FB_SIGNAL_COMPOSITE;
813 }
814 if (c & 0x02) {
815 DPRINTK("Sync on Green ");
816 specs->signal |= FB_SIGNAL_SYNC_ON_GREEN;
817 }
818 if (c & 0x01) {
819 DPRINTK("Serration on ");
820 specs->signal |= FB_SIGNAL_SERRATION_ON;
821 }
822 DPRINTK("\n");
823 specs->max_x = block[1];
824 specs->max_y = block[2];
825 DPRINTK(" Max H-size in cm: ");
826 if (specs->max_x)
827 DPRINTK("%d\n", specs->max_x);
828 else
829 DPRINTK("variable\n");
830 DPRINTK(" Max V-size in cm: ");
831 if (specs->max_y)
832 DPRINTK("%d\n", specs->max_y);
833 else
834 DPRINTK("variable\n");
835
836 c = block[3];
837 specs->gamma = c+100;
838 DPRINTK(" Gamma: ");
839 DPRINTK("%d.%d\n", specs->gamma/100, specs->gamma % 100);
840
841 get_dpms_capabilities(block[4], specs);
842
843 switch ((block[4] & 0x18) >> 3) {
844 case 0:
845 DPRINTK(" Monochrome/Grayscale\n");
846 specs->input |= FB_DISP_MONO;
847 break;
848 case 1:
849 DPRINTK(" RGB Color Display\n");
850 specs->input |= FB_DISP_RGB;
851 break;
852 case 2:
853 DPRINTK(" Non-RGB Multicolor Display\n");
854 specs->input |= FB_DISP_MULTI;
855 break;
856 default:
857 DPRINTK(" Unknown\n");
858 specs->input |= FB_DISP_UNKNOWN;
859 break;
860 }
861
862 get_chroma(block, specs);
863
864 specs->misc = 0;
865 c = block[4] & 0x7;
866 if (c & 0x04) {
867 DPRINTK(" Default color format is primary\n");
868 specs->misc |= FB_MISC_PRIM_COLOR;
869 }
870 if (c & 0x02) {
871 DPRINTK(" First DETAILED Timing is preferred\n");
872 specs->misc |= FB_MISC_1ST_DETAIL;
873 }
874 if (c & 0x01) {
875 printk(" Display is GTF capable\n");
876 specs->gtf = 1;
877 }
878 }
879
fb_parse_edid(unsigned char * edid,struct fb_var_screeninfo * var)880 int fb_parse_edid(unsigned char *edid, struct fb_var_screeninfo *var)
881 {
882 int i;
883 unsigned char *block;
884
885 if (edid == NULL || var == NULL)
886 return 1;
887
888 if (!(edid_checksum(edid)))
889 return 1;
890
891 if (!(edid_check_header(edid)))
892 return 1;
893
894 block = edid + DETAILED_TIMING_DESCRIPTIONS_START;
895
896 for (i = 0; i < 4; i++, block += DETAILED_TIMING_DESCRIPTION_SIZE) {
897 if (edid_is_timing_block(block)) {
898 var->xres = var->xres_virtual = H_ACTIVE;
899 var->yres = var->yres_virtual = V_ACTIVE;
900 var->height = var->width = 0;
901 var->right_margin = H_SYNC_OFFSET;
902 var->left_margin = (H_ACTIVE + H_BLANKING) -
903 (H_ACTIVE + H_SYNC_OFFSET + H_SYNC_WIDTH);
904 var->upper_margin = V_BLANKING - V_SYNC_OFFSET -
905 V_SYNC_WIDTH;
906 var->lower_margin = V_SYNC_OFFSET;
907 var->hsync_len = H_SYNC_WIDTH;
908 var->vsync_len = V_SYNC_WIDTH;
909 var->pixclock = PIXEL_CLOCK;
910 var->pixclock /= 1000;
911 var->pixclock = KHZ2PICOS(var->pixclock);
912
913 if (HSYNC_POSITIVE)
914 var->sync |= FB_SYNC_HOR_HIGH_ACT;
915 if (VSYNC_POSITIVE)
916 var->sync |= FB_SYNC_VERT_HIGH_ACT;
917 return 0;
918 }
919 }
920 return 1;
921 }
922
fb_edid_to_monspecs(unsigned char * edid,struct fb_monspecs * specs)923 void fb_edid_to_monspecs(unsigned char *edid, struct fb_monspecs *specs)
924 {
925 unsigned char *block;
926 int i, found = 0;
927
928 if (edid == NULL)
929 return;
930
931 if (!(edid_checksum(edid)))
932 return;
933
934 if (!(edid_check_header(edid)))
935 return;
936
937 memset(specs, 0, sizeof(struct fb_monspecs));
938
939 specs->version = edid[EDID_STRUCT_VERSION];
940 specs->revision = edid[EDID_STRUCT_REVISION];
941
942 DPRINTK("========================================\n");
943 DPRINTK("Display Information (EDID)\n");
944 DPRINTK("========================================\n");
945 DPRINTK(" EDID Version %d.%d\n", (int) specs->version,
946 (int) specs->revision);
947
948 parse_vendor_block(edid + ID_MANUFACTURER_NAME, specs);
949
950 block = edid + DETAILED_TIMING_DESCRIPTIONS_START;
951 for (i = 0; i < 4; i++, block += DETAILED_TIMING_DESCRIPTION_SIZE) {
952 if (edid_is_serial_block(block)) {
953 copy_string(block, specs->serial_no);
954 DPRINTK(" Serial Number: %s\n", specs->serial_no);
955 } else if (edid_is_ascii_block(block)) {
956 copy_string(block, specs->ascii);
957 DPRINTK(" ASCII Block: %s\n", specs->ascii);
958 } else if (edid_is_monitor_block(block)) {
959 copy_string(block, specs->monitor);
960 DPRINTK(" Monitor Name: %s\n", specs->monitor);
961 }
962 }
963
964 DPRINTK(" Display Characteristics:\n");
965 get_monspecs(edid, specs);
966
967 specs->modedb = fb_create_modedb(edid, &specs->modedb_len);
968
969 /*
970 * Workaround for buggy EDIDs that sets that the first
971 * detailed timing is preferred but has not detailed
972 * timing specified
973 */
974 for (i = 0; i < specs->modedb_len; i++) {
975 if (specs->modedb[i].flag & FB_MODE_IS_DETAILED) {
976 found = 1;
977 break;
978 }
979 }
980
981 if (!found)
982 specs->misc &= ~FB_MISC_1ST_DETAIL;
983
984 DPRINTK("========================================\n");
985 }
986
987 /**
988 * fb_edid_add_monspecs() - add monitor video modes from E-EDID data
989 * @edid: 128 byte array with an E-EDID block
990 * @spacs: monitor specs to be extended
991 */
fb_edid_add_monspecs(unsigned char * edid,struct fb_monspecs * specs)992 void fb_edid_add_monspecs(unsigned char *edid, struct fb_monspecs *specs)
993 {
994 unsigned char *block;
995 struct fb_videomode *m;
996 int num = 0, i;
997 u8 svd[64], edt[(128 - 4) / DETAILED_TIMING_DESCRIPTION_SIZE];
998 u8 pos = 4, svd_n = 0;
999
1000 if (!edid)
1001 return;
1002
1003 if (!edid_checksum(edid))
1004 return;
1005
1006 if (edid[0] != 0x2 ||
1007 edid[2] < 4 || edid[2] > 128 - DETAILED_TIMING_DESCRIPTION_SIZE)
1008 return;
1009
1010 DPRINTK(" Short Video Descriptors\n");
1011
1012 while (pos < edid[2]) {
1013 u8 len = edid[pos] & 0x1f, type = (edid[pos] >> 5) & 7;
1014 pr_debug("Data block %u of %u bytes\n", type, len);
1015 if (type == 2) {
1016 for (i = pos; i < pos + len; i++) {
1017 u8 idx = edid[pos + i] & 0x7f;
1018 svd[svd_n++] = idx;
1019 pr_debug("N%sative mode #%d\n",
1020 edid[pos + i] & 0x80 ? "" : "on-n", idx);
1021 }
1022 } else if (type == 3 && len >= 3) {
1023 /* Check Vendor Specific Data Block. For HDMI,
1024 it is always 00-0C-03 for HDMI Licensing, LLC. */
1025 if (edid[pos + 1] == 3 && edid[pos + 2] == 0xc &&
1026 edid[pos + 3] == 0)
1027 specs->misc |= FB_MISC_HDMI;
1028 }
1029 pos += len + 1;
1030 }
1031
1032 block = edid + edid[2];
1033
1034 DPRINTK(" Extended Detailed Timings\n");
1035
1036 for (i = 0; i < (128 - edid[2]) / DETAILED_TIMING_DESCRIPTION_SIZE;
1037 i++, block += DETAILED_TIMING_DESCRIPTION_SIZE)
1038 if (PIXEL_CLOCK)
1039 edt[num++] = block - edid;
1040
1041 /* Yikes, EDID data is totally useless */
1042 if (!(num + svd_n))
1043 return;
1044
1045 m = kzalloc((specs->modedb_len + num + svd_n) *
1046 sizeof(struct fb_videomode), GFP_KERNEL);
1047
1048 if (!m)
1049 return;
1050
1051 memcpy(m, specs->modedb, specs->modedb_len * sizeof(struct fb_videomode));
1052
1053 for (i = specs->modedb_len; i < specs->modedb_len + num; i++) {
1054 get_detailed_timing(edid + edt[i - specs->modedb_len], &m[i]);
1055 if (i == specs->modedb_len)
1056 m[i].flag |= FB_MODE_IS_FIRST;
1057 pr_debug("Adding %ux%u@%u\n", m[i].xres, m[i].yres, m[i].refresh);
1058 }
1059
1060 for (i = specs->modedb_len + num; i < specs->modedb_len + num + svd_n; i++) {
1061 int idx = svd[i - specs->modedb_len - num];
1062 if (!idx || idx > 63) {
1063 pr_warning("Reserved SVD code %d\n", idx);
1064 } else if (idx > ARRAY_SIZE(cea_modes) || !cea_modes[idx].xres) {
1065 pr_warning("Unimplemented SVD code %d\n", idx);
1066 } else {
1067 memcpy(&m[i], cea_modes + idx, sizeof(m[i]));
1068 pr_debug("Adding SVD #%d: %ux%u@%u\n", idx,
1069 m[i].xres, m[i].yres, m[i].refresh);
1070 }
1071 }
1072
1073 kfree(specs->modedb);
1074 specs->modedb = m;
1075 specs->modedb_len = specs->modedb_len + num + svd_n;
1076 }
1077
1078 /*
1079 * VESA Generalized Timing Formula (GTF)
1080 */
1081
1082 #define FLYBACK 550
1083 #define V_FRONTPORCH 1
1084 #define H_OFFSET 40
1085 #define H_SCALEFACTOR 20
1086 #define H_BLANKSCALE 128
1087 #define H_GRADIENT 600
1088 #define C_VAL 30
1089 #define M_VAL 300
1090
1091 struct __fb_timings {
1092 u32 dclk;
1093 u32 hfreq;
1094 u32 vfreq;
1095 u32 hactive;
1096 u32 vactive;
1097 u32 hblank;
1098 u32 vblank;
1099 u32 htotal;
1100 u32 vtotal;
1101 };
1102
1103 /**
1104 * fb_get_vblank - get vertical blank time
1105 * @hfreq: horizontal freq
1106 *
1107 * DESCRIPTION:
1108 * vblank = right_margin + vsync_len + left_margin
1109 *
1110 * given: right_margin = 1 (V_FRONTPORCH)
1111 * vsync_len = 3
1112 * flyback = 550
1113 *
1114 * flyback * hfreq
1115 * left_margin = --------------- - vsync_len
1116 * 1000000
1117 */
fb_get_vblank(u32 hfreq)1118 static u32 fb_get_vblank(u32 hfreq)
1119 {
1120 u32 vblank;
1121
1122 vblank = (hfreq * FLYBACK)/1000;
1123 vblank = (vblank + 500)/1000;
1124 return (vblank + V_FRONTPORCH);
1125 }
1126
1127 /**
1128 * fb_get_hblank_by_freq - get horizontal blank time given hfreq
1129 * @hfreq: horizontal freq
1130 * @xres: horizontal resolution in pixels
1131 *
1132 * DESCRIPTION:
1133 *
1134 * xres * duty_cycle
1135 * hblank = ------------------
1136 * 100 - duty_cycle
1137 *
1138 * duty cycle = percent of htotal assigned to inactive display
1139 * duty cycle = C - (M/Hfreq)
1140 *
1141 * where: C = ((offset - scale factor) * blank_scale)
1142 * -------------------------------------- + scale factor
1143 * 256
1144 * M = blank_scale * gradient
1145 *
1146 */
fb_get_hblank_by_hfreq(u32 hfreq,u32 xres)1147 static u32 fb_get_hblank_by_hfreq(u32 hfreq, u32 xres)
1148 {
1149 u32 c_val, m_val, duty_cycle, hblank;
1150
1151 c_val = (((H_OFFSET - H_SCALEFACTOR) * H_BLANKSCALE)/256 +
1152 H_SCALEFACTOR) * 1000;
1153 m_val = (H_BLANKSCALE * H_GRADIENT)/256;
1154 m_val = (m_val * 1000000)/hfreq;
1155 duty_cycle = c_val - m_val;
1156 hblank = (xres * duty_cycle)/(100000 - duty_cycle);
1157 return (hblank);
1158 }
1159
1160 /**
1161 * fb_get_hblank_by_dclk - get horizontal blank time given pixelclock
1162 * @dclk: pixelclock in Hz
1163 * @xres: horizontal resolution in pixels
1164 *
1165 * DESCRIPTION:
1166 *
1167 * xres * duty_cycle
1168 * hblank = ------------------
1169 * 100 - duty_cycle
1170 *
1171 * duty cycle = percent of htotal assigned to inactive display
1172 * duty cycle = C - (M * h_period)
1173 *
1174 * where: h_period = SQRT(100 - C + (0.4 * xres * M)/dclk) + C - 100
1175 * -----------------------------------------------
1176 * 2 * M
1177 * M = 300;
1178 * C = 30;
1179
1180 */
fb_get_hblank_by_dclk(u32 dclk,u32 xres)1181 static u32 fb_get_hblank_by_dclk(u32 dclk, u32 xres)
1182 {
1183 u32 duty_cycle, h_period, hblank;
1184
1185 dclk /= 1000;
1186 h_period = 100 - C_VAL;
1187 h_period *= h_period;
1188 h_period += (M_VAL * xres * 2 * 1000)/(5 * dclk);
1189 h_period *= 10000;
1190
1191 h_period = int_sqrt(h_period);
1192 h_period -= (100 - C_VAL) * 100;
1193 h_period *= 1000;
1194 h_period /= 2 * M_VAL;
1195
1196 duty_cycle = C_VAL * 1000 - (M_VAL * h_period)/100;
1197 hblank = (xres * duty_cycle)/(100000 - duty_cycle) + 8;
1198 hblank &= ~15;
1199 return (hblank);
1200 }
1201
1202 /**
1203 * fb_get_hfreq - estimate hsync
1204 * @vfreq: vertical refresh rate
1205 * @yres: vertical resolution
1206 *
1207 * DESCRIPTION:
1208 *
1209 * (yres + front_port) * vfreq * 1000000
1210 * hfreq = -------------------------------------
1211 * (1000000 - (vfreq * FLYBACK)
1212 *
1213 */
1214
fb_get_hfreq(u32 vfreq,u32 yres)1215 static u32 fb_get_hfreq(u32 vfreq, u32 yres)
1216 {
1217 u32 divisor, hfreq;
1218
1219 divisor = (1000000 - (vfreq * FLYBACK))/1000;
1220 hfreq = (yres + V_FRONTPORCH) * vfreq * 1000;
1221 return (hfreq/divisor);
1222 }
1223
fb_timings_vfreq(struct __fb_timings * timings)1224 static void fb_timings_vfreq(struct __fb_timings *timings)
1225 {
1226 timings->hfreq = fb_get_hfreq(timings->vfreq, timings->vactive);
1227 timings->vblank = fb_get_vblank(timings->hfreq);
1228 timings->vtotal = timings->vactive + timings->vblank;
1229 timings->hblank = fb_get_hblank_by_hfreq(timings->hfreq,
1230 timings->hactive);
1231 timings->htotal = timings->hactive + timings->hblank;
1232 timings->dclk = timings->htotal * timings->hfreq;
1233 }
1234
fb_timings_hfreq(struct __fb_timings * timings)1235 static void fb_timings_hfreq(struct __fb_timings *timings)
1236 {
1237 timings->vblank = fb_get_vblank(timings->hfreq);
1238 timings->vtotal = timings->vactive + timings->vblank;
1239 timings->vfreq = timings->hfreq/timings->vtotal;
1240 timings->hblank = fb_get_hblank_by_hfreq(timings->hfreq,
1241 timings->hactive);
1242 timings->htotal = timings->hactive + timings->hblank;
1243 timings->dclk = timings->htotal * timings->hfreq;
1244 }
1245
fb_timings_dclk(struct __fb_timings * timings)1246 static void fb_timings_dclk(struct __fb_timings *timings)
1247 {
1248 timings->hblank = fb_get_hblank_by_dclk(timings->dclk,
1249 timings->hactive);
1250 timings->htotal = timings->hactive + timings->hblank;
1251 timings->hfreq = timings->dclk/timings->htotal;
1252 timings->vblank = fb_get_vblank(timings->hfreq);
1253 timings->vtotal = timings->vactive + timings->vblank;
1254 timings->vfreq = timings->hfreq/timings->vtotal;
1255 }
1256
1257 /*
1258 * fb_get_mode - calculates video mode using VESA GTF
1259 * @flags: if: 0 - maximize vertical refresh rate
1260 * 1 - vrefresh-driven calculation;
1261 * 2 - hscan-driven calculation;
1262 * 3 - pixelclock-driven calculation;
1263 * @val: depending on @flags, ignored, vrefresh, hsync or pixelclock
1264 * @var: pointer to fb_var_screeninfo
1265 * @info: pointer to fb_info
1266 *
1267 * DESCRIPTION:
1268 * Calculates video mode based on monitor specs using VESA GTF.
1269 * The GTF is best for VESA GTF compliant monitors but is
1270 * specifically formulated to work for older monitors as well.
1271 *
1272 * If @flag==0, the function will attempt to maximize the
1273 * refresh rate. Otherwise, it will calculate timings based on
1274 * the flag and accompanying value.
1275 *
1276 * If FB_IGNOREMON bit is set in @flags, monitor specs will be
1277 * ignored and @var will be filled with the calculated timings.
1278 *
1279 * All calculations are based on the VESA GTF Spreadsheet
1280 * available at VESA's public ftp (http://www.vesa.org).
1281 *
1282 * NOTES:
1283 * The timings generated by the GTF will be different from VESA
1284 * DMT. It might be a good idea to keep a table of standard
1285 * VESA modes as well. The GTF may also not work for some displays,
1286 * such as, and especially, analog TV.
1287 *
1288 * REQUIRES:
1289 * A valid info->monspecs, otherwise 'safe numbers' will be used.
1290 */
fb_get_mode(int flags,u32 val,struct fb_var_screeninfo * var,struct fb_info * info)1291 int fb_get_mode(int flags, u32 val, struct fb_var_screeninfo *var, struct fb_info *info)
1292 {
1293 struct __fb_timings *timings;
1294 u32 interlace = 1, dscan = 1;
1295 u32 hfmin, hfmax, vfmin, vfmax, dclkmin, dclkmax, err = 0;
1296
1297
1298 timings = kzalloc(sizeof(struct __fb_timings), GFP_KERNEL);
1299
1300 if (!timings)
1301 return -ENOMEM;
1302
1303 /*
1304 * If monspecs are invalid, use values that are enough
1305 * for 640x480@60
1306 */
1307 if (!info || !info->monspecs.hfmax || !info->monspecs.vfmax ||
1308 !info->monspecs.dclkmax ||
1309 info->monspecs.hfmax < info->monspecs.hfmin ||
1310 info->monspecs.vfmax < info->monspecs.vfmin ||
1311 info->monspecs.dclkmax < info->monspecs.dclkmin) {
1312 hfmin = 29000; hfmax = 30000;
1313 vfmin = 60; vfmax = 60;
1314 dclkmin = 0; dclkmax = 25000000;
1315 } else {
1316 hfmin = info->monspecs.hfmin;
1317 hfmax = info->monspecs.hfmax;
1318 vfmin = info->monspecs.vfmin;
1319 vfmax = info->monspecs.vfmax;
1320 dclkmin = info->monspecs.dclkmin;
1321 dclkmax = info->monspecs.dclkmax;
1322 }
1323
1324 timings->hactive = var->xres;
1325 timings->vactive = var->yres;
1326 if (var->vmode & FB_VMODE_INTERLACED) {
1327 timings->vactive /= 2;
1328 interlace = 2;
1329 }
1330 if (var->vmode & FB_VMODE_DOUBLE) {
1331 timings->vactive *= 2;
1332 dscan = 2;
1333 }
1334
1335 switch (flags & ~FB_IGNOREMON) {
1336 case FB_MAXTIMINGS: /* maximize refresh rate */
1337 timings->hfreq = hfmax;
1338 fb_timings_hfreq(timings);
1339 if (timings->vfreq > vfmax) {
1340 timings->vfreq = vfmax;
1341 fb_timings_vfreq(timings);
1342 }
1343 if (timings->dclk > dclkmax) {
1344 timings->dclk = dclkmax;
1345 fb_timings_dclk(timings);
1346 }
1347 break;
1348 case FB_VSYNCTIMINGS: /* vrefresh driven */
1349 timings->vfreq = val;
1350 fb_timings_vfreq(timings);
1351 break;
1352 case FB_HSYNCTIMINGS: /* hsync driven */
1353 timings->hfreq = val;
1354 fb_timings_hfreq(timings);
1355 break;
1356 case FB_DCLKTIMINGS: /* pixelclock driven */
1357 timings->dclk = PICOS2KHZ(val) * 1000;
1358 fb_timings_dclk(timings);
1359 break;
1360 default:
1361 err = -EINVAL;
1362
1363 }
1364
1365 if (err || (!(flags & FB_IGNOREMON) &&
1366 (timings->vfreq < vfmin || timings->vfreq > vfmax ||
1367 timings->hfreq < hfmin || timings->hfreq > hfmax ||
1368 timings->dclk < dclkmin || timings->dclk > dclkmax))) {
1369 err = -EINVAL;
1370 } else {
1371 var->pixclock = KHZ2PICOS(timings->dclk/1000);
1372 var->hsync_len = (timings->htotal * 8)/100;
1373 var->right_margin = (timings->hblank/2) - var->hsync_len;
1374 var->left_margin = timings->hblank - var->right_margin -
1375 var->hsync_len;
1376 var->vsync_len = (3 * interlace)/dscan;
1377 var->lower_margin = (1 * interlace)/dscan;
1378 var->upper_margin = (timings->vblank * interlace)/dscan -
1379 (var->vsync_len + var->lower_margin);
1380 }
1381
1382 kfree(timings);
1383 return err;
1384 }
1385
1386 #ifdef CONFIG_VIDEOMODE_HELPERS
fb_videomode_from_videomode(const struct videomode * vm,struct fb_videomode * fbmode)1387 int fb_videomode_from_videomode(const struct videomode *vm,
1388 struct fb_videomode *fbmode)
1389 {
1390 unsigned int htotal, vtotal;
1391
1392 fbmode->xres = vm->hactive;
1393 fbmode->left_margin = vm->hback_porch;
1394 fbmode->right_margin = vm->hfront_porch;
1395 fbmode->hsync_len = vm->hsync_len;
1396
1397 fbmode->yres = vm->vactive;
1398 fbmode->upper_margin = vm->vback_porch;
1399 fbmode->lower_margin = vm->vfront_porch;
1400 fbmode->vsync_len = vm->vsync_len;
1401
1402 /* prevent division by zero in KHZ2PICOS macro */
1403 fbmode->pixclock = vm->pixelclock ?
1404 KHZ2PICOS(vm->pixelclock / 1000) : 0;
1405
1406 fbmode->sync = 0;
1407 fbmode->vmode = 0;
1408 if (vm->flags & DISPLAY_FLAGS_HSYNC_HIGH)
1409 fbmode->sync |= FB_SYNC_HOR_HIGH_ACT;
1410 if (vm->flags & DISPLAY_FLAGS_VSYNC_HIGH)
1411 fbmode->sync |= FB_SYNC_VERT_HIGH_ACT;
1412 if (vm->flags & DISPLAY_FLAGS_INTERLACED)
1413 fbmode->vmode |= FB_VMODE_INTERLACED;
1414 if (vm->flags & DISPLAY_FLAGS_DOUBLESCAN)
1415 fbmode->vmode |= FB_VMODE_DOUBLE;
1416 fbmode->flag = 0;
1417
1418 htotal = vm->hactive + vm->hfront_porch + vm->hback_porch +
1419 vm->hsync_len;
1420 vtotal = vm->vactive + vm->vfront_porch + vm->vback_porch +
1421 vm->vsync_len;
1422 /* prevent division by zero */
1423 if (htotal && vtotal) {
1424 fbmode->refresh = vm->pixelclock / (htotal * vtotal);
1425 /* a mode must have htotal and vtotal != 0 or it is invalid */
1426 } else {
1427 fbmode->refresh = 0;
1428 return -EINVAL;
1429 }
1430
1431 return 0;
1432 }
1433 EXPORT_SYMBOL_GPL(fb_videomode_from_videomode);
1434
1435 #ifdef CONFIG_OF
dump_fb_videomode(const struct fb_videomode * m)1436 static inline void dump_fb_videomode(const struct fb_videomode *m)
1437 {
1438 pr_debug("fb_videomode = %ux%u@%uHz (%ukHz) %u %u %u %u %u %u %u %u %u\n",
1439 m->xres, m->yres, m->refresh, m->pixclock, m->left_margin,
1440 m->right_margin, m->upper_margin, m->lower_margin,
1441 m->hsync_len, m->vsync_len, m->sync, m->vmode, m->flag);
1442 }
1443
1444 /**
1445 * of_get_fb_videomode - get a fb_videomode from devicetree
1446 * @np: device_node with the timing specification
1447 * @fb: will be set to the return value
1448 * @index: index into the list of display timings in devicetree
1449 *
1450 * DESCRIPTION:
1451 * This function is expensive and should only be used, if only one mode is to be
1452 * read from DT. To get multiple modes start with of_get_display_timings ond
1453 * work with that instead.
1454 */
of_get_fb_videomode(struct device_node * np,struct fb_videomode * fb,int index)1455 int of_get_fb_videomode(struct device_node *np, struct fb_videomode *fb,
1456 int index)
1457 {
1458 struct videomode vm;
1459 int ret;
1460
1461 ret = of_get_videomode(np, &vm, index);
1462 if (ret)
1463 return ret;
1464
1465 fb_videomode_from_videomode(&vm, fb);
1466
1467 pr_debug("%s: got %dx%d display mode from %s\n",
1468 of_node_full_name(np), vm.hactive, vm.vactive, np->name);
1469 dump_fb_videomode(fb);
1470
1471 return 0;
1472 }
1473 EXPORT_SYMBOL_GPL(of_get_fb_videomode);
1474 #endif /* CONFIG_OF */
1475 #endif /* CONFIG_VIDEOMODE_HELPERS */
1476
1477 #else
fb_parse_edid(unsigned char * edid,struct fb_var_screeninfo * var)1478 int fb_parse_edid(unsigned char *edid, struct fb_var_screeninfo *var)
1479 {
1480 return 1;
1481 }
fb_edid_to_monspecs(unsigned char * edid,struct fb_monspecs * specs)1482 void fb_edid_to_monspecs(unsigned char *edid, struct fb_monspecs *specs)
1483 {
1484 specs = NULL;
1485 }
fb_edid_add_monspecs(unsigned char * edid,struct fb_monspecs * specs)1486 void fb_edid_add_monspecs(unsigned char *edid, struct fb_monspecs *specs)
1487 {
1488 }
fb_destroy_modedb(struct fb_videomode * modedb)1489 void fb_destroy_modedb(struct fb_videomode *modedb)
1490 {
1491 }
fb_get_mode(int flags,u32 val,struct fb_var_screeninfo * var,struct fb_info * info)1492 int fb_get_mode(int flags, u32 val, struct fb_var_screeninfo *var,
1493 struct fb_info *info)
1494 {
1495 return -EINVAL;
1496 }
1497 #endif /* CONFIG_FB_MODE_HELPERS */
1498
1499 /*
1500 * fb_validate_mode - validates var against monitor capabilities
1501 * @var: pointer to fb_var_screeninfo
1502 * @info: pointer to fb_info
1503 *
1504 * DESCRIPTION:
1505 * Validates video mode against monitor capabilities specified in
1506 * info->monspecs.
1507 *
1508 * REQUIRES:
1509 * A valid info->monspecs.
1510 */
fb_validate_mode(const struct fb_var_screeninfo * var,struct fb_info * info)1511 int fb_validate_mode(const struct fb_var_screeninfo *var, struct fb_info *info)
1512 {
1513 u32 hfreq, vfreq, htotal, vtotal, pixclock;
1514 u32 hfmin, hfmax, vfmin, vfmax, dclkmin, dclkmax;
1515
1516 /*
1517 * If monspecs are invalid, use values that are enough
1518 * for 640x480@60
1519 */
1520 if (!info->monspecs.hfmax || !info->monspecs.vfmax ||
1521 !info->monspecs.dclkmax ||
1522 info->monspecs.hfmax < info->monspecs.hfmin ||
1523 info->monspecs.vfmax < info->monspecs.vfmin ||
1524 info->monspecs.dclkmax < info->monspecs.dclkmin) {
1525 hfmin = 29000; hfmax = 30000;
1526 vfmin = 60; vfmax = 60;
1527 dclkmin = 0; dclkmax = 25000000;
1528 } else {
1529 hfmin = info->monspecs.hfmin;
1530 hfmax = info->monspecs.hfmax;
1531 vfmin = info->monspecs.vfmin;
1532 vfmax = info->monspecs.vfmax;
1533 dclkmin = info->monspecs.dclkmin;
1534 dclkmax = info->monspecs.dclkmax;
1535 }
1536
1537 if (!var->pixclock)
1538 return -EINVAL;
1539 pixclock = PICOS2KHZ(var->pixclock) * 1000;
1540
1541 htotal = var->xres + var->right_margin + var->hsync_len +
1542 var->left_margin;
1543 vtotal = var->yres + var->lower_margin + var->vsync_len +
1544 var->upper_margin;
1545
1546 if (var->vmode & FB_VMODE_INTERLACED)
1547 vtotal /= 2;
1548 if (var->vmode & FB_VMODE_DOUBLE)
1549 vtotal *= 2;
1550
1551 hfreq = pixclock/htotal;
1552 hfreq = (hfreq + 500) / 1000 * 1000;
1553
1554 vfreq = hfreq/vtotal;
1555
1556 return (vfreq < vfmin || vfreq > vfmax ||
1557 hfreq < hfmin || hfreq > hfmax ||
1558 pixclock < dclkmin || pixclock > dclkmax) ?
1559 -EINVAL : 0;
1560 }
1561
1562 #if defined(CONFIG_FIRMWARE_EDID) && defined(CONFIG_X86)
1563
1564 /*
1565 * We need to ensure that the EDID block is only returned for
1566 * the primary graphics adapter.
1567 */
1568
fb_firmware_edid(struct device * device)1569 const unsigned char *fb_firmware_edid(struct device *device)
1570 {
1571 struct pci_dev *dev = NULL;
1572 struct resource *res = NULL;
1573 unsigned char *edid = NULL;
1574
1575 if (device)
1576 dev = to_pci_dev(device);
1577
1578 if (dev)
1579 res = &dev->resource[PCI_ROM_RESOURCE];
1580
1581 if (res && res->flags & IORESOURCE_ROM_SHADOW)
1582 edid = edid_info.dummy;
1583
1584 return edid;
1585 }
1586 #else
fb_firmware_edid(struct device * device)1587 const unsigned char *fb_firmware_edid(struct device *device)
1588 {
1589 return NULL;
1590 }
1591 #endif
1592 EXPORT_SYMBOL(fb_firmware_edid);
1593
1594 EXPORT_SYMBOL(fb_parse_edid);
1595 EXPORT_SYMBOL(fb_edid_to_monspecs);
1596 EXPORT_SYMBOL(fb_edid_add_monspecs);
1597 EXPORT_SYMBOL(fb_get_mode);
1598 EXPORT_SYMBOL(fb_validate_mode);
1599 EXPORT_SYMBOL(fb_destroy_modedb);
1600