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-rw-r--r--drivers/video/fbdev/core/fbmon.c1592
1 files changed, 1592 insertions, 0 deletions
diff --git a/drivers/video/fbdev/core/fbmon.c b/drivers/video/fbdev/core/fbmon.c
new file mode 100644
index 000000000000..c204ebe6187e
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+++ b/drivers/video/fbdev/core/fbmon.c
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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
59struct broken_edid {
60 u8 manufacturer[4];
61 u32 model;
62 u32 fix;
63};
64
65static 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
86static const unsigned char edid_v1_header[] = { 0x00, 0xff, 0xff, 0xff,
87 0xff, 0xff, 0xff, 0x00
88};
89
90static 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
100static 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
110static 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
120static 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
130static 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
140static 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
149static 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
211static 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
260static 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
281static 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
296static 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
314static 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
330static 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
385static 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
413static 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
498static 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
542static 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
553static 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 */
604static 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 */
676void fb_destroy_modedb(struct fb_videomode *modedb)
677{
678 kfree(modedb);
679}
680
681static 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
762static 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
880int 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
923void 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 */
992void 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 pos += len + 1;
1023 }
1024
1025 block = edid + edid[2];
1026
1027 DPRINTK(" Extended Detailed Timings\n");
1028
1029 for (i = 0; i < (128 - edid[2]) / DETAILED_TIMING_DESCRIPTION_SIZE;
1030 i++, block += DETAILED_TIMING_DESCRIPTION_SIZE)
1031 if (PIXEL_CLOCK)
1032 edt[num++] = block - edid;
1033
1034 /* Yikes, EDID data is totally useless */
1035 if (!(num + svd_n))
1036 return;
1037
1038 m = kzalloc((specs->modedb_len + num + svd_n) *
1039 sizeof(struct fb_videomode), GFP_KERNEL);
1040
1041 if (!m)
1042 return;
1043
1044 memcpy(m, specs->modedb, specs->modedb_len * sizeof(struct fb_videomode));
1045
1046 for (i = specs->modedb_len; i < specs->modedb_len + num; i++) {
1047 get_detailed_timing(edid + edt[i - specs->modedb_len], &m[i]);
1048 if (i == specs->modedb_len)
1049 m[i].flag |= FB_MODE_IS_FIRST;
1050 pr_debug("Adding %ux%u@%u\n", m[i].xres, m[i].yres, m[i].refresh);
1051 }
1052
1053 for (i = specs->modedb_len + num; i < specs->modedb_len + num + svd_n; i++) {
1054 int idx = svd[i - specs->modedb_len - num];
1055 if (!idx || idx > 63) {
1056 pr_warning("Reserved SVD code %d\n", idx);
1057 } else if (idx > ARRAY_SIZE(cea_modes) || !cea_modes[idx].xres) {
1058 pr_warning("Unimplemented SVD code %d\n", idx);
1059 } else {
1060 memcpy(&m[i], cea_modes + idx, sizeof(m[i]));
1061 pr_debug("Adding SVD #%d: %ux%u@%u\n", idx,
1062 m[i].xres, m[i].yres, m[i].refresh);
1063 }
1064 }
1065
1066 kfree(specs->modedb);
1067 specs->modedb = m;
1068 specs->modedb_len = specs->modedb_len + num + svd_n;
1069}
1070
1071/*
1072 * VESA Generalized Timing Formula (GTF)
1073 */
1074
1075#define FLYBACK 550
1076#define V_FRONTPORCH 1
1077#define H_OFFSET 40
1078#define H_SCALEFACTOR 20
1079#define H_BLANKSCALE 128
1080#define H_GRADIENT 600
1081#define C_VAL 30
1082#define M_VAL 300
1083
1084struct __fb_timings {
1085 u32 dclk;
1086 u32 hfreq;
1087 u32 vfreq;
1088 u32 hactive;
1089 u32 vactive;
1090 u32 hblank;
1091 u32 vblank;
1092 u32 htotal;
1093 u32 vtotal;
1094};
1095
1096/**
1097 * fb_get_vblank - get vertical blank time
1098 * @hfreq: horizontal freq
1099 *
1100 * DESCRIPTION:
1101 * vblank = right_margin + vsync_len + left_margin
1102 *
1103 * given: right_margin = 1 (V_FRONTPORCH)
1104 * vsync_len = 3
1105 * flyback = 550
1106 *
1107 * flyback * hfreq
1108 * left_margin = --------------- - vsync_len
1109 * 1000000
1110 */
1111static u32 fb_get_vblank(u32 hfreq)
1112{
1113 u32 vblank;
1114
1115 vblank = (hfreq * FLYBACK)/1000;
1116 vblank = (vblank + 500)/1000;
1117 return (vblank + V_FRONTPORCH);
1118}
1119
1120/**
1121 * fb_get_hblank_by_freq - get horizontal blank time given hfreq
1122 * @hfreq: horizontal freq
1123 * @xres: horizontal resolution in pixels
1124 *
1125 * DESCRIPTION:
1126 *
1127 * xres * duty_cycle
1128 * hblank = ------------------
1129 * 100 - duty_cycle
1130 *
1131 * duty cycle = percent of htotal assigned to inactive display
1132 * duty cycle = C - (M/Hfreq)
1133 *
1134 * where: C = ((offset - scale factor) * blank_scale)
1135 * -------------------------------------- + scale factor
1136 * 256
1137 * M = blank_scale * gradient
1138 *
1139 */
1140static u32 fb_get_hblank_by_hfreq(u32 hfreq, u32 xres)
1141{
1142 u32 c_val, m_val, duty_cycle, hblank;
1143
1144 c_val = (((H_OFFSET - H_SCALEFACTOR) * H_BLANKSCALE)/256 +
1145 H_SCALEFACTOR) * 1000;
1146 m_val = (H_BLANKSCALE * H_GRADIENT)/256;
1147 m_val = (m_val * 1000000)/hfreq;
1148 duty_cycle = c_val - m_val;
1149 hblank = (xres * duty_cycle)/(100000 - duty_cycle);
1150 return (hblank);
1151}
1152
1153/**
1154 * fb_get_hblank_by_dclk - get horizontal blank time given pixelclock
1155 * @dclk: pixelclock in Hz
1156 * @xres: horizontal resolution in pixels
1157 *
1158 * DESCRIPTION:
1159 *
1160 * xres * duty_cycle
1161 * hblank = ------------------
1162 * 100 - duty_cycle
1163 *
1164 * duty cycle = percent of htotal assigned to inactive display
1165 * duty cycle = C - (M * h_period)
1166 *
1167 * where: h_period = SQRT(100 - C + (0.4 * xres * M)/dclk) + C - 100
1168 * -----------------------------------------------
1169 * 2 * M
1170 * M = 300;
1171 * C = 30;
1172
1173 */
1174static u32 fb_get_hblank_by_dclk(u32 dclk, u32 xres)
1175{
1176 u32 duty_cycle, h_period, hblank;
1177
1178 dclk /= 1000;
1179 h_period = 100 - C_VAL;
1180 h_period *= h_period;
1181 h_period += (M_VAL * xres * 2 * 1000)/(5 * dclk);
1182 h_period *= 10000;
1183
1184 h_period = int_sqrt(h_period);
1185 h_period -= (100 - C_VAL) * 100;
1186 h_period *= 1000;
1187 h_period /= 2 * M_VAL;
1188
1189 duty_cycle = C_VAL * 1000 - (M_VAL * h_period)/100;
1190 hblank = (xres * duty_cycle)/(100000 - duty_cycle) + 8;
1191 hblank &= ~15;
1192 return (hblank);
1193}
1194
1195/**
1196 * fb_get_hfreq - estimate hsync
1197 * @vfreq: vertical refresh rate
1198 * @yres: vertical resolution
1199 *
1200 * DESCRIPTION:
1201 *
1202 * (yres + front_port) * vfreq * 1000000
1203 * hfreq = -------------------------------------
1204 * (1000000 - (vfreq * FLYBACK)
1205 *
1206 */
1207
1208static u32 fb_get_hfreq(u32 vfreq, u32 yres)
1209{
1210 u32 divisor, hfreq;
1211
1212 divisor = (1000000 - (vfreq * FLYBACK))/1000;
1213 hfreq = (yres + V_FRONTPORCH) * vfreq * 1000;
1214 return (hfreq/divisor);
1215}
1216
1217static void fb_timings_vfreq(struct __fb_timings *timings)
1218{
1219 timings->hfreq = fb_get_hfreq(timings->vfreq, timings->vactive);
1220 timings->vblank = fb_get_vblank(timings->hfreq);
1221 timings->vtotal = timings->vactive + timings->vblank;
1222 timings->hblank = fb_get_hblank_by_hfreq(timings->hfreq,
1223 timings->hactive);
1224 timings->htotal = timings->hactive + timings->hblank;
1225 timings->dclk = timings->htotal * timings->hfreq;
1226}
1227
1228static void fb_timings_hfreq(struct __fb_timings *timings)
1229{
1230 timings->vblank = fb_get_vblank(timings->hfreq);
1231 timings->vtotal = timings->vactive + timings->vblank;
1232 timings->vfreq = timings->hfreq/timings->vtotal;
1233 timings->hblank = fb_get_hblank_by_hfreq(timings->hfreq,
1234 timings->hactive);
1235 timings->htotal = timings->hactive + timings->hblank;
1236 timings->dclk = timings->htotal * timings->hfreq;
1237}
1238
1239static void fb_timings_dclk(struct __fb_timings *timings)
1240{
1241 timings->hblank = fb_get_hblank_by_dclk(timings->dclk,
1242 timings->hactive);
1243 timings->htotal = timings->hactive + timings->hblank;
1244 timings->hfreq = timings->dclk/timings->htotal;
1245 timings->vblank = fb_get_vblank(timings->hfreq);
1246 timings->vtotal = timings->vactive + timings->vblank;
1247 timings->vfreq = timings->hfreq/timings->vtotal;
1248}
1249
1250/*
1251 * fb_get_mode - calculates video mode using VESA GTF
1252 * @flags: if: 0 - maximize vertical refresh rate
1253 * 1 - vrefresh-driven calculation;
1254 * 2 - hscan-driven calculation;
1255 * 3 - pixelclock-driven calculation;
1256 * @val: depending on @flags, ignored, vrefresh, hsync or pixelclock
1257 * @var: pointer to fb_var_screeninfo
1258 * @info: pointer to fb_info
1259 *
1260 * DESCRIPTION:
1261 * Calculates video mode based on monitor specs using VESA GTF.
1262 * The GTF is best for VESA GTF compliant monitors but is
1263 * specifically formulated to work for older monitors as well.
1264 *
1265 * If @flag==0, the function will attempt to maximize the
1266 * refresh rate. Otherwise, it will calculate timings based on
1267 * the flag and accompanying value.
1268 *
1269 * If FB_IGNOREMON bit is set in @flags, monitor specs will be
1270 * ignored and @var will be filled with the calculated timings.
1271 *
1272 * All calculations are based on the VESA GTF Spreadsheet
1273 * available at VESA's public ftp (http://www.vesa.org).
1274 *
1275 * NOTES:
1276 * The timings generated by the GTF will be different from VESA
1277 * DMT. It might be a good idea to keep a table of standard
1278 * VESA modes as well. The GTF may also not work for some displays,
1279 * such as, and especially, analog TV.
1280 *
1281 * REQUIRES:
1282 * A valid info->monspecs, otherwise 'safe numbers' will be used.
1283 */
1284int fb_get_mode(int flags, u32 val, struct fb_var_screeninfo *var, struct fb_info *info)
1285{
1286 struct __fb_timings *timings;
1287 u32 interlace = 1, dscan = 1;
1288 u32 hfmin, hfmax, vfmin, vfmax, dclkmin, dclkmax, err = 0;
1289
1290
1291 timings = kzalloc(sizeof(struct __fb_timings), GFP_KERNEL);
1292
1293 if (!timings)
1294 return -ENOMEM;
1295
1296 /*
1297 * If monspecs are invalid, use values that are enough
1298 * for 640x480@60
1299 */
1300 if (!info || !info->monspecs.hfmax || !info->monspecs.vfmax ||
1301 !info->monspecs.dclkmax ||
1302 info->monspecs.hfmax < info->monspecs.hfmin ||
1303 info->monspecs.vfmax < info->monspecs.vfmin ||
1304 info->monspecs.dclkmax < info->monspecs.dclkmin) {
1305 hfmin = 29000; hfmax = 30000;
1306 vfmin = 60; vfmax = 60;
1307 dclkmin = 0; dclkmax = 25000000;
1308 } else {
1309 hfmin = info->monspecs.hfmin;
1310 hfmax = info->monspecs.hfmax;
1311 vfmin = info->monspecs.vfmin;
1312 vfmax = info->monspecs.vfmax;
1313 dclkmin = info->monspecs.dclkmin;
1314 dclkmax = info->monspecs.dclkmax;
1315 }
1316
1317 timings->hactive = var->xres;
1318 timings->vactive = var->yres;
1319 if (var->vmode & FB_VMODE_INTERLACED) {
1320 timings->vactive /= 2;
1321 interlace = 2;
1322 }
1323 if (var->vmode & FB_VMODE_DOUBLE) {
1324 timings->vactive *= 2;
1325 dscan = 2;
1326 }
1327
1328 switch (flags & ~FB_IGNOREMON) {
1329 case FB_MAXTIMINGS: /* maximize refresh rate */
1330 timings->hfreq = hfmax;
1331 fb_timings_hfreq(timings);
1332 if (timings->vfreq > vfmax) {
1333 timings->vfreq = vfmax;
1334 fb_timings_vfreq(timings);
1335 }
1336 if (timings->dclk > dclkmax) {
1337 timings->dclk = dclkmax;
1338 fb_timings_dclk(timings);
1339 }
1340 break;
1341 case FB_VSYNCTIMINGS: /* vrefresh driven */
1342 timings->vfreq = val;
1343 fb_timings_vfreq(timings);
1344 break;
1345 case FB_HSYNCTIMINGS: /* hsync driven */
1346 timings->hfreq = val;
1347 fb_timings_hfreq(timings);
1348 break;
1349 case FB_DCLKTIMINGS: /* pixelclock driven */
1350 timings->dclk = PICOS2KHZ(val) * 1000;
1351 fb_timings_dclk(timings);
1352 break;
1353 default:
1354 err = -EINVAL;
1355
1356 }
1357
1358 if (err || (!(flags & FB_IGNOREMON) &&
1359 (timings->vfreq < vfmin || timings->vfreq > vfmax ||
1360 timings->hfreq < hfmin || timings->hfreq > hfmax ||
1361 timings->dclk < dclkmin || timings->dclk > dclkmax))) {
1362 err = -EINVAL;
1363 } else {
1364 var->pixclock = KHZ2PICOS(timings->dclk/1000);
1365 var->hsync_len = (timings->htotal * 8)/100;
1366 var->right_margin = (timings->hblank/2) - var->hsync_len;
1367 var->left_margin = timings->hblank - var->right_margin -
1368 var->hsync_len;
1369 var->vsync_len = (3 * interlace)/dscan;
1370 var->lower_margin = (1 * interlace)/dscan;
1371 var->upper_margin = (timings->vblank * interlace)/dscan -
1372 (var->vsync_len + var->lower_margin);
1373 }
1374
1375 kfree(timings);
1376 return err;
1377}
1378
1379#ifdef CONFIG_VIDEOMODE_HELPERS
1380int fb_videomode_from_videomode(const struct videomode *vm,
1381 struct fb_videomode *fbmode)
1382{
1383 unsigned int htotal, vtotal;
1384
1385 fbmode->xres = vm->hactive;
1386 fbmode->left_margin = vm->hback_porch;
1387 fbmode->right_margin = vm->hfront_porch;
1388 fbmode->hsync_len = vm->hsync_len;
1389
1390 fbmode->yres = vm->vactive;
1391 fbmode->upper_margin = vm->vback_porch;
1392 fbmode->lower_margin = vm->vfront_porch;
1393 fbmode->vsync_len = vm->vsync_len;
1394
1395 /* prevent division by zero in KHZ2PICOS macro */
1396 fbmode->pixclock = vm->pixelclock ?
1397 KHZ2PICOS(vm->pixelclock / 1000) : 0;
1398
1399 fbmode->sync = 0;
1400 fbmode->vmode = 0;
1401 if (vm->flags & DISPLAY_FLAGS_HSYNC_HIGH)
1402 fbmode->sync |= FB_SYNC_HOR_HIGH_ACT;
1403 if (vm->flags & DISPLAY_FLAGS_VSYNC_HIGH)
1404 fbmode->sync |= FB_SYNC_VERT_HIGH_ACT;
1405 if (vm->flags & DISPLAY_FLAGS_INTERLACED)
1406 fbmode->vmode |= FB_VMODE_INTERLACED;
1407 if (vm->flags & DISPLAY_FLAGS_DOUBLESCAN)
1408 fbmode->vmode |= FB_VMODE_DOUBLE;
1409 fbmode->flag = 0;
1410
1411 htotal = vm->hactive + vm->hfront_porch + vm->hback_porch +
1412 vm->hsync_len;
1413 vtotal = vm->vactive + vm->vfront_porch + vm->vback_porch +
1414 vm->vsync_len;
1415 /* prevent division by zero */
1416 if (htotal && vtotal) {
1417 fbmode->refresh = vm->pixelclock / (htotal * vtotal);
1418 /* a mode must have htotal and vtotal != 0 or it is invalid */
1419 } else {
1420 fbmode->refresh = 0;
1421 return -EINVAL;
1422 }
1423
1424 return 0;
1425}
1426EXPORT_SYMBOL_GPL(fb_videomode_from_videomode);
1427
1428#ifdef CONFIG_OF
1429static inline void dump_fb_videomode(const struct fb_videomode *m)
1430{
1431 pr_debug("fb_videomode = %ux%u@%uHz (%ukHz) %u %u %u %u %u %u %u %u %u\n",
1432 m->xres, m->yres, m->refresh, m->pixclock, m->left_margin,
1433 m->right_margin, m->upper_margin, m->lower_margin,
1434 m->hsync_len, m->vsync_len, m->sync, m->vmode, m->flag);
1435}
1436
1437/**
1438 * of_get_fb_videomode - get a fb_videomode from devicetree
1439 * @np: device_node with the timing specification
1440 * @fb: will be set to the return value
1441 * @index: index into the list of display timings in devicetree
1442 *
1443 * DESCRIPTION:
1444 * This function is expensive and should only be used, if only one mode is to be
1445 * read from DT. To get multiple modes start with of_get_display_timings ond
1446 * work with that instead.
1447 */
1448int of_get_fb_videomode(struct device_node *np, struct fb_videomode *fb,
1449 int index)
1450{
1451 struct videomode vm;
1452 int ret;
1453
1454 ret = of_get_videomode(np, &vm, index);
1455 if (ret)
1456 return ret;
1457
1458 fb_videomode_from_videomode(&vm, fb);
1459
1460 pr_debug("%s: got %dx%d display mode from %s\n",
1461 of_node_full_name(np), vm.hactive, vm.vactive, np->name);
1462 dump_fb_videomode(fb);
1463
1464 return 0;
1465}
1466EXPORT_SYMBOL_GPL(of_get_fb_videomode);
1467#endif /* CONFIG_OF */
1468#endif /* CONFIG_VIDEOMODE_HELPERS */
1469
1470#else
1471int fb_parse_edid(unsigned char *edid, struct fb_var_screeninfo *var)
1472{
1473 return 1;
1474}
1475void fb_edid_to_monspecs(unsigned char *edid, struct fb_monspecs *specs)
1476{
1477 specs = NULL;
1478}
1479void fb_edid_add_monspecs(unsigned char *edid, struct fb_monspecs *specs)
1480{
1481}
1482void fb_destroy_modedb(struct fb_videomode *modedb)
1483{
1484}
1485int fb_get_mode(int flags, u32 val, struct fb_var_screeninfo *var,
1486 struct fb_info *info)
1487{
1488 return -EINVAL;
1489}
1490#endif /* CONFIG_FB_MODE_HELPERS */
1491
1492/*
1493 * fb_validate_mode - validates var against monitor capabilities
1494 * @var: pointer to fb_var_screeninfo
1495 * @info: pointer to fb_info
1496 *
1497 * DESCRIPTION:
1498 * Validates video mode against monitor capabilities specified in
1499 * info->monspecs.
1500 *
1501 * REQUIRES:
1502 * A valid info->monspecs.
1503 */
1504int fb_validate_mode(const struct fb_var_screeninfo *var, struct fb_info *info)
1505{
1506 u32 hfreq, vfreq, htotal, vtotal, pixclock;
1507 u32 hfmin, hfmax, vfmin, vfmax, dclkmin, dclkmax;
1508
1509 /*
1510 * If monspecs are invalid, use values that are enough
1511 * for 640x480@60
1512 */
1513 if (!info->monspecs.hfmax || !info->monspecs.vfmax ||
1514 !info->monspecs.dclkmax ||
1515 info->monspecs.hfmax < info->monspecs.hfmin ||
1516 info->monspecs.vfmax < info->monspecs.vfmin ||
1517 info->monspecs.dclkmax < info->monspecs.dclkmin) {
1518 hfmin = 29000; hfmax = 30000;
1519 vfmin = 60; vfmax = 60;
1520 dclkmin = 0; dclkmax = 25000000;
1521 } else {
1522 hfmin = info->monspecs.hfmin;
1523 hfmax = info->monspecs.hfmax;
1524 vfmin = info->monspecs.vfmin;
1525 vfmax = info->monspecs.vfmax;
1526 dclkmin = info->monspecs.dclkmin;
1527 dclkmax = info->monspecs.dclkmax;
1528 }
1529
1530 if (!var->pixclock)
1531 return -EINVAL;
1532 pixclock = PICOS2KHZ(var->pixclock) * 1000;
1533
1534 htotal = var->xres + var->right_margin + var->hsync_len +
1535 var->left_margin;
1536 vtotal = var->yres + var->lower_margin + var->vsync_len +
1537 var->upper_margin;
1538
1539 if (var->vmode & FB_VMODE_INTERLACED)
1540 vtotal /= 2;
1541 if (var->vmode & FB_VMODE_DOUBLE)
1542 vtotal *= 2;
1543
1544 hfreq = pixclock/htotal;
1545 hfreq = (hfreq + 500) / 1000 * 1000;
1546
1547 vfreq = hfreq/vtotal;
1548
1549 return (vfreq < vfmin || vfreq > vfmax ||
1550 hfreq < hfmin || hfreq > hfmax ||
1551 pixclock < dclkmin || pixclock > dclkmax) ?
1552 -EINVAL : 0;
1553}
1554
1555#if defined(CONFIG_FIRMWARE_EDID) && defined(CONFIG_X86)
1556
1557/*
1558 * We need to ensure that the EDID block is only returned for
1559 * the primary graphics adapter.
1560 */
1561
1562const unsigned char *fb_firmware_edid(struct device *device)
1563{
1564 struct pci_dev *dev = NULL;
1565 struct resource *res = NULL;
1566 unsigned char *edid = NULL;
1567
1568 if (device)
1569 dev = to_pci_dev(device);
1570
1571 if (dev)
1572 res = &dev->resource[PCI_ROM_RESOURCE];
1573
1574 if (res && res->flags & IORESOURCE_ROM_SHADOW)
1575 edid = edid_info.dummy;
1576
1577 return edid;
1578}
1579#else
1580const unsigned char *fb_firmware_edid(struct device *device)
1581{
1582 return NULL;
1583}
1584#endif
1585EXPORT_SYMBOL(fb_firmware_edid);
1586
1587EXPORT_SYMBOL(fb_parse_edid);
1588EXPORT_SYMBOL(fb_edid_to_monspecs);
1589EXPORT_SYMBOL(fb_edid_add_monspecs);
1590EXPORT_SYMBOL(fb_get_mode);
1591EXPORT_SYMBOL(fb_validate_mode);
1592EXPORT_SYMBOL(fb_destroy_modedb);
generated by cgit v1.2.2 (git 2.25.0) at 2025-10-01 11:21:31 -0400