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[PATCH] fbmon: horizontal frequency rounding fix
[linux-2.6/kmemtrace.git] / drivers / video / fbmon.c
blobc2718bb949493bc8fb6a61a7e0ef94fd281650fb
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/tty.h>
30 #include <linux/fb.h>
31 #include <linux/module.h>
32 #ifdef CONFIG_PPC_OF
33 #include <linux/pci.h>
34 #include <asm/prom.h>
35 #include <asm/pci-bridge.h>
36 #endif
37 #include "edid.h"
38
39 /*
40 * EDID parser
41 */
42
43 #undef DEBUG /* define this for verbose EDID parsing output */
44
45 #ifdef DEBUG
46 #define DPRINTK(fmt, args...) printk(fmt,## args)
47 #else
48 #define DPRINTK(fmt, args...)
49 #endif
50
51 #define FBMON_FIX_HEADER 1
52 #define FBMON_FIX_INPUT 2
53
54 #ifdef CONFIG_FB_MODE_HELPERS
55 struct broken_edid {
56 u8 manufacturer[4];
57 u32 model;
58 u32 fix;
59 };
60
61 static struct broken_edid brokendb[] = {
62 /* DEC FR-PCXAV-YZ */
63 {
64 .manufacturer = "DEC",
65 .model = 0x073a,
66 .fix = FBMON_FIX_HEADER,
67 },
68 /* ViewSonic PF775a */
69 {
70 .manufacturer = "VSC",
71 .model = 0x5a44,
72 .fix = FBMON_FIX_INPUT,
73 },
74 };
75
76 static const unsigned char edid_v1_header[] = { 0x00, 0xff, 0xff, 0xff,
77 0xff, 0xff, 0xff, 0x00
78 };
79
80 static void copy_string(unsigned char *c, unsigned char *s)
81 {
82 int i;
83 c = c + 5;
84 for (i = 0; (i < 13 && *c != 0x0A); i++)
85 *(s++) = *(c++);
86 *s = 0;
87 while (i-- && (*--s == 0x20)) *s = 0;
88 }
89
90 static int check_edid(unsigned char *edid)
91 {
92 unsigned char *block = edid + ID_MANUFACTURER_NAME, manufacturer[4];
93 unsigned char *b;
94 u32 model;
95 int i, fix = 0, ret = 0;
96
97 manufacturer[0] = ((block[0] & 0x7c) >> 2) + '@';
98 manufacturer[1] = ((block[0] & 0x03) << 3) +
99 ((block[1] & 0xe0) >> 5) + '@';
100 manufacturer[2] = (block[1] & 0x1f) + '@';
101 manufacturer[3] = 0;
102 model = block[2] + (block[3] << 8);
103
104 for (i = 0; i < ARRAY_SIZE(brokendb); i++) {
105 if (!strncmp(manufacturer, brokendb[i].manufacturer, 4) &&
106 brokendb[i].model == model) {
107 printk("fbmon: The EDID Block of "
108 "Manufacturer: %s Model: 0x%x is known to "
109 "be broken,\n", manufacturer, model);
110 fix = brokendb[i].fix;
111 break;
112 }
113 }
114
115 switch (fix) {
116 case FBMON_FIX_HEADER:
117 for (i = 0; i < 8; i++) {
118 if (edid[i] != edid_v1_header[i])
119 ret = fix;
120 }
121 break;
122 case FBMON_FIX_INPUT:
123 b = edid + EDID_STRUCT_DISPLAY;
124 /* Only if display is GTF capable will
125 the input type be reset to analog */
126 if (b[4] & 0x01 && b[0] & 0x80)
127 ret = fix;
128 break;
129 }
130
131 return ret;
132 }
133
134 static void fix_edid(unsigned char *edid, int fix)
135 {
136 unsigned char *b;
137
138 switch (fix) {
139 case FBMON_FIX_HEADER:
140 printk("fbmon: trying a header reconstruct\n");
141 memcpy(edid, edid_v1_header, 8);
142 break;
143 case FBMON_FIX_INPUT:
144 printk("fbmon: trying to fix input type\n");
145 b = edid + EDID_STRUCT_DISPLAY;
146 b[0] &= ~0x80;
147 edid[127] += 0x80;
148 }
149 }
150
151 static int edid_checksum(unsigned char *edid)
152 {
153 unsigned char i, csum = 0, all_null = 0;
154 int err = 0, fix = check_edid(edid);
155
156 if (fix)
157 fix_edid(edid, fix);
158
159 for (i = 0; i < EDID_LENGTH; i++) {
160 csum += edid[i];
161 all_null |= edid[i];
162 }
163
164 if (csum == 0x00 && all_null) {
165 /* checksum passed, everything's good */
166 err = 1;
167 }
168
169 return err;
170 }
171
172 static int edid_check_header(unsigned char *edid)
173 {
174 int i, err = 1, fix = check_edid(edid);
175
176 if (fix)
177 fix_edid(edid, fix);
178
179 for (i = 0; i < 8; i++) {
180 if (edid[i] != edid_v1_header[i])
181 err = 0;
182 }
183
184 return err;
185 }
186
187 static void parse_vendor_block(unsigned char *block, struct fb_monspecs *specs)
188 {
189 specs->manufacturer[0] = ((block[0] & 0x7c) >> 2) + '@';
190 specs->manufacturer[1] = ((block[0] & 0x03) << 3) +
191 ((block[1] & 0xe0) >> 5) + '@';
192 specs->manufacturer[2] = (block[1] & 0x1f) + '@';
193 specs->manufacturer[3] = 0;
194 specs->model = block[2] + (block[3] << 8);
195 specs->serial = block[4] + (block[5] << 8) +
196 (block[6] << 16) + (block[7] << 24);
197 specs->year = block[9] + 1990;
198 specs->week = block[8];
199 DPRINTK(" Manufacturer: %s\n", specs->manufacturer);
200 DPRINTK(" Model: %x\n", specs->model);
201 DPRINTK(" Serial#: %u\n", specs->serial);
202 DPRINTK(" Year: %u Week %u\n", specs->year, specs->week);
203 }
204
205 static void get_dpms_capabilities(unsigned char flags,
206 struct fb_monspecs *specs)
207 {
208 specs->dpms = 0;
209 if (flags & DPMS_ACTIVE_OFF)
210 specs->dpms |= FB_DPMS_ACTIVE_OFF;
211 if (flags & DPMS_SUSPEND)
212 specs->dpms |= FB_DPMS_SUSPEND;
213 if (flags & DPMS_STANDBY)
214 specs->dpms |= FB_DPMS_STANDBY;
215 DPRINTK(" DPMS: Active %s, Suspend %s, Standby %s\n",
216 (flags & DPMS_ACTIVE_OFF) ? "yes" : "no",
217 (flags & DPMS_SUSPEND) ? "yes" : "no",
218 (flags & DPMS_STANDBY) ? "yes" : "no");
219 }
220
221 static void get_chroma(unsigned char *block, struct fb_monspecs *specs)
222 {
223 int tmp;
224
225 DPRINTK(" Chroma\n");
226 /* Chromaticity data */
227 tmp = ((block[5] & (3 << 6)) >> 6) | (block[0x7] << 2);
228 tmp *= 1000;
229 tmp += 512;
230 specs->chroma.redx = tmp/1024;
231 DPRINTK(" RedX: 0.%03d ", specs->chroma.redx);
232
233 tmp = ((block[5] & (3 << 4)) >> 4) | (block[0x8] << 2);
234 tmp *= 1000;
235 tmp += 512;
236 specs->chroma.redy = tmp/1024;
237 DPRINTK("RedY: 0.%03d\n", specs->chroma.redy);
238
239 tmp = ((block[5] & (3 << 2)) >> 2) | (block[0x9] << 2);
240 tmp *= 1000;
241 tmp += 512;
242 specs->chroma.greenx = tmp/1024;
243 DPRINTK(" GreenX: 0.%03d ", specs->chroma.greenx);
244
245 tmp = (block[5] & 3) | (block[0xa] << 2);
246 tmp *= 1000;
247 tmp += 512;
248 specs->chroma.greeny = tmp/1024;
249 DPRINTK("GreenY: 0.%03d\n", specs->chroma.greeny);
250
251 tmp = ((block[6] & (3 << 6)) >> 6) | (block[0xb] << 2);
252 tmp *= 1000;
253 tmp += 512;
254 specs->chroma.bluex = tmp/1024;
255 DPRINTK(" BlueX: 0.%03d ", specs->chroma.bluex);
256
257 tmp = ((block[6] & (3 << 4)) >> 4) | (block[0xc] << 2);
258 tmp *= 1000;
259 tmp += 512;
260 specs->chroma.bluey = tmp/1024;
261 DPRINTK("BlueY: 0.%03d\n", specs->chroma.bluey);
262
263 tmp = ((block[6] & (3 << 2)) >> 2) | (block[0xd] << 2);
264 tmp *= 1000;
265 tmp += 512;
266 specs->chroma.whitex = tmp/1024;
267 DPRINTK(" WhiteX: 0.%03d ", specs->chroma.whitex);
268
269 tmp = (block[6] & 3) | (block[0xe] << 2);
270 tmp *= 1000;
271 tmp += 512;
272 specs->chroma.whitey = tmp/1024;
273 DPRINTK("WhiteY: 0.%03d\n", specs->chroma.whitey);
274 }
275
276 static int edid_is_serial_block(unsigned char *block)
277 {
278 if ((block[0] == 0x00) && (block[1] == 0x00) &&
279 (block[2] == 0x00) && (block[3] == 0xff) &&
280 (block[4] == 0x00))
281 return 1;
282 else
283 return 0;
284 }
285
286 static int edid_is_ascii_block(unsigned char *block)
287 {
288 if ((block[0] == 0x00) && (block[1] == 0x00) &&
289 (block[2] == 0x00) && (block[3] == 0xfe) &&
290 (block[4] == 0x00))
291 return 1;
292 else
293 return 0;
294 }
295
296 static int edid_is_limits_block(unsigned char *block)
297 {
298 if ((block[0] == 0x00) && (block[1] == 0x00) &&
299 (block[2] == 0x00) && (block[3] == 0xfd) &&
300 (block[4] == 0x00))
301 return 1;
302 else
303 return 0;
304 }
305
306 static int edid_is_monitor_block(unsigned char *block)
307 {
308 if ((block[0] == 0x00) && (block[1] == 0x00) &&
309 (block[2] == 0x00) && (block[3] == 0xfc) &&
310 (block[4] == 0x00))
311 return 1;
312 else
313 return 0;
314 }
315
316 static void calc_mode_timings(int xres, int yres, int refresh, struct fb_videomode *mode)
317 {
318 struct fb_var_screeninfo var;
319 struct fb_info info;
320
321 var.xres = xres;
322 var.yres = yres;
323 fb_get_mode(FB_VSYNCTIMINGS | FB_IGNOREMON,
324 refresh, &var, &info);
325 mode->xres = xres;
326 mode->yres = yres;
327 mode->pixclock = var.pixclock;
328 mode->refresh = refresh;
329 mode->left_margin = var.left_margin;
330 mode->right_margin = var.right_margin;
331 mode->upper_margin = var.upper_margin;
332 mode->lower_margin = var.lower_margin;
333 mode->hsync_len = var.hsync_len;
334 mode->vsync_len = var.vsync_len;
335 mode->vmode = 0;
336 mode->sync = 0;
337 }
338
339 static int get_est_timing(unsigned char *block, struct fb_videomode *mode)
340 {
341 int num = 0;
342 unsigned char c;
343
344 c = block[0];
345 if (c&0x80) {
346 calc_mode_timings(720, 400, 70, &mode[num]);
347 mode[num++].flag = FB_MODE_IS_CALCULATED;
348 DPRINTK(" 720x400@70Hz\n");
349 }
350 if (c&0x40) {
351 calc_mode_timings(720, 400, 88, &mode[num]);
352 mode[num++].flag = FB_MODE_IS_CALCULATED;
353 DPRINTK(" 720x400@88Hz\n");
354 }
355 if (c&0x20) {
356 mode[num++] = vesa_modes[3];
357 DPRINTK(" 640x480@60Hz\n");
358 }
359 if (c&0x10) {
360 calc_mode_timings(640, 480, 67, &mode[num]);
361 mode[num++].flag = FB_MODE_IS_CALCULATED;
362 DPRINTK(" 640x480@67Hz\n");
363 }
364 if (c&0x08) {
365 mode[num++] = vesa_modes[4];
366 DPRINTK(" 640x480@72Hz\n");
367 }
368 if (c&0x04) {
369 mode[num++] = vesa_modes[5];
370 DPRINTK(" 640x480@75Hz\n");
371 }
372 if (c&0x02) {
373 mode[num++] = vesa_modes[7];
374 DPRINTK(" 800x600@56Hz\n");
375 }
376 if (c&0x01) {
377 mode[num++] = vesa_modes[8];
378 DPRINTK(" 800x600@60Hz\n");
379 }
380
381 c = block[1];
382 if (c&0x80) {
383 mode[num++] = vesa_modes[9];
384 DPRINTK(" 800x600@72Hz\n");
385 }
386 if (c&0x40) {
387 mode[num++] = vesa_modes[10];
388 DPRINTK(" 800x600@75Hz\n");
389 }
390 if (c&0x20) {
391 calc_mode_timings(832, 624, 75, &mode[num]);
392 mode[num++].flag = FB_MODE_IS_CALCULATED;
393 DPRINTK(" 832x624@75Hz\n");
394 }
395 if (c&0x10) {
396 mode[num++] = vesa_modes[12];
397 DPRINTK(" 1024x768@87Hz Interlaced\n");
398 }
399 if (c&0x08) {
400 mode[num++] = vesa_modes[13];
401 DPRINTK(" 1024x768@60Hz\n");
402 }
403 if (c&0x04) {
404 mode[num++] = vesa_modes[14];
405 DPRINTK(" 1024x768@70Hz\n");
406 }
407 if (c&0x02) {
408 mode[num++] = vesa_modes[15];
409 DPRINTK(" 1024x768@75Hz\n");
410 }
411 if (c&0x01) {
412 mode[num++] = vesa_modes[21];
413 DPRINTK(" 1280x1024@75Hz\n");
414 }
415 c = block[2];
416 if (c&0x80) {
417 mode[num++] = vesa_modes[17];
418 DPRINTK(" 1152x870@75Hz\n");
419 }
420 DPRINTK(" Manufacturer's mask: %x\n",c&0x7F);
421 return num;
422 }
423
424 static int get_std_timing(unsigned char *block, struct fb_videomode *mode)
425 {
426 int xres, yres = 0, refresh, ratio, i;
427
428 xres = (block[0] + 31) * 8;
429 if (xres <= 256)
430 return 0;
431
432 ratio = (block[1] & 0xc0) >> 6;
433 switch (ratio) {
434 case 0:
435 yres = xres;
436 break;
437 case 1:
438 yres = (xres * 3)/4;
439 break;
440 case 2:
441 yres = (xres * 4)/5;
442 break;
443 case 3:
444 yres = (xres * 9)/16;
445 break;
446 }
447 refresh = (block[1] & 0x3f) + 60;
448
449 DPRINTK(" %dx%d@%dHz\n", xres, yres, refresh);
450 for (i = 0; i < VESA_MODEDB_SIZE; i++) {
451 if (vesa_modes[i].xres == xres &&
452 vesa_modes[i].yres == yres &&
453 vesa_modes[i].refresh == refresh) {
454 *mode = vesa_modes[i];
455 mode->flag |= FB_MODE_IS_STANDARD;
456 return 1;
457 }
458 }
459 calc_mode_timings(xres, yres, refresh, mode);
460 return 1;
461 }
462
463 static int get_dst_timing(unsigned char *block,
464 struct fb_videomode *mode)
465 {
466 int j, num = 0;
467
468 for (j = 0; j < 6; j++, block+= STD_TIMING_DESCRIPTION_SIZE)
469 num += get_std_timing(block, &mode[num]);
470
471 return num;
472 }
473
474 static void get_detailed_timing(unsigned char *block,
475 struct fb_videomode *mode)
476 {
477 mode->xres = H_ACTIVE;
478 mode->yres = V_ACTIVE;
479 mode->pixclock = PIXEL_CLOCK;
480 mode->pixclock /= 1000;
481 mode->pixclock = KHZ2PICOS(mode->pixclock);
482 mode->right_margin = H_SYNC_OFFSET;
483 mode->left_margin = (H_ACTIVE + H_BLANKING) -
484 (H_ACTIVE + H_SYNC_OFFSET + H_SYNC_WIDTH);
485 mode->upper_margin = V_BLANKING - V_SYNC_OFFSET -
486 V_SYNC_WIDTH;
487 mode->lower_margin = V_SYNC_OFFSET;
488 mode->hsync_len = H_SYNC_WIDTH;
489 mode->vsync_len = V_SYNC_WIDTH;
490 if (HSYNC_POSITIVE)
491 mode->sync |= FB_SYNC_HOR_HIGH_ACT;
492 if (VSYNC_POSITIVE)
493 mode->sync |= FB_SYNC_VERT_HIGH_ACT;
494 mode->refresh = PIXEL_CLOCK/((H_ACTIVE + H_BLANKING) *
495 (V_ACTIVE + V_BLANKING));
496 mode->vmode = 0;
497 mode->flag = FB_MODE_IS_DETAILED;
498
499 DPRINTK(" %d MHz ", PIXEL_CLOCK/1000000);
500 DPRINTK("%d %d %d %d ", H_ACTIVE, H_ACTIVE + H_SYNC_OFFSET,
501 H_ACTIVE + H_SYNC_OFFSET + H_SYNC_WIDTH, H_ACTIVE + H_BLANKING);
502 DPRINTK("%d %d %d %d ", V_ACTIVE, V_ACTIVE + V_SYNC_OFFSET,
503 V_ACTIVE + V_SYNC_OFFSET + V_SYNC_WIDTH, V_ACTIVE + V_BLANKING);
504 DPRINTK("%sHSync %sVSync\n\n", (HSYNC_POSITIVE) ? "+" : "-",
505 (VSYNC_POSITIVE) ? "+" : "-");
506 }
507
508 /**
509 * fb_create_modedb - create video mode database
510 * @edid: EDID data
511 * @dbsize: database size
512 *
513 * RETURNS: struct fb_videomode, @dbsize contains length of database
514 *
515 * DESCRIPTION:
516 * This function builds a mode database using the contents of the EDID
517 * data
518 */
519 static struct fb_videomode *fb_create_modedb(unsigned char *edid, int *dbsize)
520 {
521 struct fb_videomode *mode, *m;
522 unsigned char *block;
523 int num = 0, i;
524
525 mode = kmalloc(50 * sizeof(struct fb_videomode), GFP_KERNEL);
526 if (mode == NULL)
527 return NULL;
528 memset(mode, 0, 50 * sizeof(struct fb_videomode));
529
530 if (edid == NULL || !edid_checksum(edid) ||
531 !edid_check_header(edid)) {
532 kfree(mode);
533 return NULL;
534 }
535
536 *dbsize = 0;
537
538 DPRINTK(" Supported VESA Modes\n");
539 block = edid + ESTABLISHED_TIMING_1;
540 num += get_est_timing(block, &mode[num]);
541
542 DPRINTK(" Standard Timings\n");
543 block = edid + STD_TIMING_DESCRIPTIONS_START;
544 for (i = 0; i < STD_TIMING; i++, block += STD_TIMING_DESCRIPTION_SIZE)
545 num += get_std_timing(block, &mode[num]);
546
547 DPRINTK(" Detailed Timings\n");
548 block = edid + DETAILED_TIMING_DESCRIPTIONS_START;
549 for (i = 0; i < 4; i++, block+= DETAILED_TIMING_DESCRIPTION_SIZE) {
550 int first = 1;
551
552 if (block[0] == 0x00 && block[1] == 0x00) {
553 if (block[3] == 0xfa) {
554 num += get_dst_timing(block + 5, &mode[num]);
555 }
556 } else {
557 get_detailed_timing(block, &mode[num]);
558 if (first) {
559 mode[num].flag |= FB_MODE_IS_FIRST;
560 first = 0;
561 }
562 num++;
563 }
564 }
565
566 /* Yikes, EDID data is totally useless */
567 if (!num) {
568 kfree(mode);
569 return NULL;
570 }
571
572 *dbsize = num;
573 m = kmalloc(num * sizeof(struct fb_videomode), GFP_KERNEL);
574 if (!m)
575 return mode;
576 memmove(m, mode, num * sizeof(struct fb_videomode));
577 kfree(mode);
578 return m;
579 }
580
581 /**
582 * fb_destroy_modedb - destroys mode database
583 * @modedb: mode database to destroy
584 *
585 * DESCRIPTION:
586 * Destroy mode database created by fb_create_modedb
587 */
588 void fb_destroy_modedb(struct fb_videomode *modedb)
589 {
590 kfree(modedb);
591 }
592
593 static int fb_get_monitor_limits(unsigned char *edid, struct fb_monspecs *specs)
594 {
595 int i, retval = 1;
596 unsigned char *block;
597
598 block = edid + DETAILED_TIMING_DESCRIPTIONS_START;
599
600 DPRINTK(" Monitor Operating Limits: ");
601 for (i = 0; i < 4; i++, block += DETAILED_TIMING_DESCRIPTION_SIZE) {
602 if (edid_is_limits_block(block)) {
603 specs->hfmin = H_MIN_RATE * 1000;
604 specs->hfmax = H_MAX_RATE * 1000;
605 specs->vfmin = V_MIN_RATE;
606 specs->vfmax = V_MAX_RATE;
607 specs->dclkmax = MAX_PIXEL_CLOCK * 1000000;
608 specs->gtf = (GTF_SUPPORT) ? 1 : 0;
609 retval = 0;
610 DPRINTK("From EDID\n");
611 break;
612 }
613 }
614
615 /* estimate monitor limits based on modes supported */
616 if (retval) {
617 struct fb_videomode *modes;
618 int num_modes, i, hz, hscan, pixclock;
619
620 modes = fb_create_modedb(edid, &num_modes);
621 if (!modes) {
622 DPRINTK("None Available\n");
623 return 1;
624 }
625
626 retval = 0;
627 for (i = 0; i < num_modes; i++) {
628 hz = modes[i].refresh;
629 pixclock = PICOS2KHZ(modes[i].pixclock) * 1000;
630 hscan = (modes[i].yres * 105 * hz + 5000)/100;
631
632 if (specs->dclkmax == 0 || specs->dclkmax < pixclock)
633 specs->dclkmax = pixclock;
634 if (specs->dclkmin == 0 || specs->dclkmin > pixclock)
635 specs->dclkmin = pixclock;
636 if (specs->hfmax == 0 || specs->hfmax < hscan)
637 specs->hfmax = hscan;
638 if (specs->hfmin == 0 || specs->hfmin > hscan)
639 specs->hfmin = hscan;
640 if (specs->vfmax == 0 || specs->vfmax < hz)
641 specs->vfmax = hz;
642 if (specs->vfmin == 0 || specs->vfmin > hz)
643 specs->vfmin = hz;
644 }
645 DPRINTK("Extrapolated\n");
646 fb_destroy_modedb(modes);
647 }
648 DPRINTK(" H: %d-%dKHz V: %d-%dHz DCLK: %dMHz\n",
649 specs->hfmin/1000, specs->hfmax/1000, specs->vfmin,
650 specs->vfmax, specs->dclkmax/1000000);
651 return retval;
652 }
653
654 static void get_monspecs(unsigned char *edid, struct fb_monspecs *specs)
655 {
656 unsigned char c, *block;
657
658 block = edid + EDID_STRUCT_DISPLAY;
659
660 fb_get_monitor_limits(edid, specs);
661
662 c = block[0] & 0x80;
663 specs->input = 0;
664 if (c) {
665 specs->input |= FB_DISP_DDI;
666 DPRINTK(" Digital Display Input");
667 } else {
668 DPRINTK(" Analog Display Input: Input Voltage - ");
669 switch ((block[0] & 0x60) >> 5) {
670 case 0:
671 DPRINTK("0.700V/0.300V");
672 specs->input |= FB_DISP_ANA_700_300;
673 break;
674 case 1:
675 DPRINTK("0.714V/0.286V");
676 specs->input |= FB_DISP_ANA_714_286;
677 break;
678 case 2:
679 DPRINTK("1.000V/0.400V");
680 specs->input |= FB_DISP_ANA_1000_400;
681 break;
682 case 3:
683 DPRINTK("0.700V/0.000V");
684 specs->input |= FB_DISP_ANA_700_000;
685 break;
686 }
687 }
688 DPRINTK("\n Sync: ");
689 c = block[0] & 0x10;
690 if (c)
691 DPRINTK(" Configurable signal level\n");
692 c = block[0] & 0x0f;
693 specs->signal = 0;
694 if (c & 0x10) {
695 DPRINTK("Blank to Blank ");
696 specs->signal |= FB_SIGNAL_BLANK_BLANK;
697 }
698 if (c & 0x08) {
699 DPRINTK("Separate ");
700 specs->signal |= FB_SIGNAL_SEPARATE;
701 }
702 if (c & 0x04) {
703 DPRINTK("Composite ");
704 specs->signal |= FB_SIGNAL_COMPOSITE;
705 }
706 if (c & 0x02) {
707 DPRINTK("Sync on Green ");
708 specs->signal |= FB_SIGNAL_SYNC_ON_GREEN;
709 }
710 if (c & 0x01) {
711 DPRINTK("Serration on ");
712 specs->signal |= FB_SIGNAL_SERRATION_ON;
713 }
714 DPRINTK("\n");
715 specs->max_x = block[1];
716 specs->max_y = block[2];
717 DPRINTK(" Max H-size in cm: ");
718 if (specs->max_x)
719 DPRINTK("%d\n", specs->max_x);
720 else
721 DPRINTK("variable\n");
722 DPRINTK(" Max V-size in cm: ");
723 if (specs->max_y)
724 DPRINTK("%d\n", specs->max_y);
725 else
726 DPRINTK("variable\n");
727
728 c = block[3];
729 specs->gamma = c+100;
730 DPRINTK(" Gamma: ");
731 DPRINTK("%d.%d\n", specs->gamma/100, specs->gamma % 100);
732
733 get_dpms_capabilities(block[4], specs);
734
735 switch ((block[4] & 0x18) >> 3) {
736 case 0:
737 DPRINTK(" Monochrome/Grayscale\n");
738 specs->input |= FB_DISP_MONO;
739 break;
740 case 1:
741 DPRINTK(" RGB Color Display\n");
742 specs->input |= FB_DISP_RGB;
743 break;
744 case 2:
745 DPRINTK(" Non-RGB Multicolor Display\n");
746 specs->input |= FB_DISP_MULTI;
747 break;
748 default:
749 DPRINTK(" Unknown\n");
750 specs->input |= FB_DISP_UNKNOWN;
751 break;
752 }
753
754 get_chroma(block, specs);
755
756 specs->misc = 0;
757 c = block[4] & 0x7;
758 if (c & 0x04) {
759 DPRINTK(" Default color format is primary\n");
760 specs->misc |= FB_MISC_PRIM_COLOR;
761 }
762 if (c & 0x02) {
763 DPRINTK(" First DETAILED Timing is preferred\n");
764 specs->misc |= FB_MISC_1ST_DETAIL;
765 }
766 if (c & 0x01) {
767 printk(" Display is GTF capable\n");
768 specs->gtf = 1;
769 }
770 }
771
772 static int edid_is_timing_block(unsigned char *block)
773 {
774 if ((block[0] != 0x00) || (block[1] != 0x00) ||
775 (block[2] != 0x00) || (block[4] != 0x00))
776 return 1;
777 else
778 return 0;
779 }
780
781 int fb_parse_edid(unsigned char *edid, struct fb_var_screeninfo *var)
782 {
783 int i;
784 unsigned char *block;
785
786 if (edid == NULL || var == NULL)
787 return 1;
788
789 if (!(edid_checksum(edid)))
790 return 1;
791
792 if (!(edid_check_header(edid)))
793 return 1;
794
795 block = edid + DETAILED_TIMING_DESCRIPTIONS_START;
796
797 for (i = 0; i < 4; i++, block += DETAILED_TIMING_DESCRIPTION_SIZE) {
798 if (edid_is_timing_block(block)) {
799 var->xres = var->xres_virtual = H_ACTIVE;
800 var->yres = var->yres_virtual = V_ACTIVE;
801 var->height = var->width = -1;
802 var->right_margin = H_SYNC_OFFSET;
803 var->left_margin = (H_ACTIVE + H_BLANKING) -
804 (H_ACTIVE + H_SYNC_OFFSET + H_SYNC_WIDTH);
805 var->upper_margin = V_BLANKING - V_SYNC_OFFSET -
806 V_SYNC_WIDTH;
807 var->lower_margin = V_SYNC_OFFSET;
808 var->hsync_len = H_SYNC_WIDTH;
809 var->vsync_len = V_SYNC_WIDTH;
810 var->pixclock = PIXEL_CLOCK;
811 var->pixclock /= 1000;
812 var->pixclock = KHZ2PICOS(var->pixclock);
813
814 if (HSYNC_POSITIVE)
815 var->sync |= FB_SYNC_HOR_HIGH_ACT;
816 if (VSYNC_POSITIVE)
817 var->sync |= FB_SYNC_VERT_HIGH_ACT;
818 return 0;
819 }
820 }
821 return 1;
822 }
823
824 void fb_edid_to_monspecs(unsigned char *edid, struct fb_monspecs *specs)
825 {
826 unsigned char *block;
827 int i;
828
829 if (edid == NULL)
830 return;
831
832 if (!(edid_checksum(edid)))
833 return;
834
835 if (!(edid_check_header(edid)))
836 return;
837
838 memset(specs, 0, sizeof(struct fb_monspecs));
839
840 specs->version = edid[EDID_STRUCT_VERSION];
841 specs->revision = edid[EDID_STRUCT_REVISION];
842
843 DPRINTK("========================================\n");
844 DPRINTK("Display Information (EDID)\n");
845 DPRINTK("========================================\n");
846 DPRINTK(" EDID Version %d.%d\n", (int) specs->version,
847 (int) specs->revision);
848
849 parse_vendor_block(edid + ID_MANUFACTURER_NAME, specs);
850
851 block = edid + DETAILED_TIMING_DESCRIPTIONS_START;
852 for (i = 0; i < 4; i++, block += DETAILED_TIMING_DESCRIPTION_SIZE) {
853 if (edid_is_serial_block(block)) {
854 copy_string(block, specs->serial_no);
855 DPRINTK(" Serial Number: %s\n", specs->serial_no);
856 } else if (edid_is_ascii_block(block)) {
857 copy_string(block, specs->ascii);
858 DPRINTK(" ASCII Block: %s\n", specs->ascii);
859 } else if (edid_is_monitor_block(block)) {
860 copy_string(block, specs->monitor);
861 DPRINTK(" Monitor Name: %s\n", specs->monitor);
862 }
863 }
864
865 DPRINTK(" Display Characteristics:\n");
866 get_monspecs(edid, specs);
867
868 specs->modedb = fb_create_modedb(edid, &specs->modedb_len);
869 DPRINTK("========================================\n");
870 }
871
872 /*
873 * VESA Generalized Timing Formula (GTF)
874 */
875
876 #define FLYBACK 550
877 #define V_FRONTPORCH 1
878 #define H_OFFSET 40
879 #define H_SCALEFACTOR 20
880 #define H_BLANKSCALE 128
881 #define H_GRADIENT 600
882 #define C_VAL 30
883 #define M_VAL 300
884
885 struct __fb_timings {
886 u32 dclk;
887 u32 hfreq;
888 u32 vfreq;
889 u32 hactive;
890 u32 vactive;
891 u32 hblank;
892 u32 vblank;
893 u32 htotal;
894 u32 vtotal;
895 };
896
897 /**
898 * fb_get_vblank - get vertical blank time
899 * @hfreq: horizontal freq
900 *
901 * DESCRIPTION:
902 * vblank = right_margin + vsync_len + left_margin
903 *
904 * given: right_margin = 1 (V_FRONTPORCH)
905 * vsync_len = 3
906 * flyback = 550
907 *
908 * flyback * hfreq
909 * left_margin = --------------- - vsync_len
910 * 1000000
911 */
912 static u32 fb_get_vblank(u32 hfreq)
913 {
914 u32 vblank;
915
916 vblank = (hfreq * FLYBACK)/1000;
917 vblank = (vblank + 500)/1000;
918 return (vblank + V_FRONTPORCH);
919 }
920
921 /**
922 * fb_get_hblank_by_freq - get horizontal blank time given hfreq
923 * @hfreq: horizontal freq
924 * @xres: horizontal resolution in pixels
925 *
926 * DESCRIPTION:
927 *
928 * xres * duty_cycle
929 * hblank = ------------------
930 * 100 - duty_cycle
931 *
932 * duty cycle = percent of htotal assigned to inactive display
933 * duty cycle = C - (M/Hfreq)
934 *
935 * where: C = ((offset - scale factor) * blank_scale)
936 * -------------------------------------- + scale factor
937 * 256
938 * M = blank_scale * gradient
939 *
940 */
941 static u32 fb_get_hblank_by_hfreq(u32 hfreq, u32 xres)
942 {
943 u32 c_val, m_val, duty_cycle, hblank;
944
945 c_val = (((H_OFFSET - H_SCALEFACTOR) * H_BLANKSCALE)/256 +
946 H_SCALEFACTOR) * 1000;
947 m_val = (H_BLANKSCALE * H_GRADIENT)/256;
948 m_val = (m_val * 1000000)/hfreq;
949 duty_cycle = c_val - m_val;
950 hblank = (xres * duty_cycle)/(100000 - duty_cycle);
951 return (hblank);
952 }
953
954 /**
955 * fb_get_hblank_by_dclk - get horizontal blank time given pixelclock
956 * @dclk: pixelclock in Hz
957 * @xres: horizontal resolution in pixels
958 *
959 * DESCRIPTION:
960 *
961 * xres * duty_cycle
962 * hblank = ------------------
963 * 100 - duty_cycle
964 *
965 * duty cycle = percent of htotal assigned to inactive display
966 * duty cycle = C - (M * h_period)
967 *
968 * where: h_period = SQRT(100 - C + (0.4 * xres * M)/dclk) + C - 100
969 * -----------------------------------------------
970 * 2 * M
971 * M = 300;
972 * C = 30;
973
974 */
975 static u32 fb_get_hblank_by_dclk(u32 dclk, u32 xres)
976 {
977 u32 duty_cycle, h_period, hblank;
978
979 dclk /= 1000;
980 h_period = 100 - C_VAL;
981 h_period *= h_period;
982 h_period += (M_VAL * xres * 2 * 1000)/(5 * dclk);
983 h_period *=10000;
984
985 h_period = int_sqrt(h_period);
986 h_period -= (100 - C_VAL) * 100;
987 h_period *= 1000;
988 h_period /= 2 * M_VAL;
989
990 duty_cycle = C_VAL * 1000 - (M_VAL * h_period)/100;
991 hblank = (xres * duty_cycle)/(100000 - duty_cycle) + 8;
992 hblank &= ~15;
993 return (hblank);
994 }
995
996 /**
997 * fb_get_hfreq - estimate hsync
998 * @vfreq: vertical refresh rate
999 * @yres: vertical resolution
1000 *
1001 * DESCRIPTION:
1002 *
1003 * (yres + front_port) * vfreq * 1000000
1004 * hfreq = -------------------------------------
1005 * (1000000 - (vfreq * FLYBACK)
1006 *
1007 */
1008
1009 static u32 fb_get_hfreq(u32 vfreq, u32 yres)
1010 {
1011 u32 divisor, hfreq;
1012
1013 divisor = (1000000 - (vfreq * FLYBACK))/1000;
1014 hfreq = (yres + V_FRONTPORCH) * vfreq * 1000;
1015 return (hfreq/divisor);
1016 }
1017
1018 static void fb_timings_vfreq(struct __fb_timings *timings)
1019 {
1020 timings->hfreq = fb_get_hfreq(timings->vfreq, timings->vactive);
1021 timings->vblank = fb_get_vblank(timings->hfreq);
1022 timings->vtotal = timings->vactive + timings->vblank;
1023 timings->hblank = fb_get_hblank_by_hfreq(timings->hfreq,
1024 timings->hactive);
1025 timings->htotal = timings->hactive + timings->hblank;
1026 timings->dclk = timings->htotal * timings->hfreq;
1027 }
1028
1029 static void fb_timings_hfreq(struct __fb_timings *timings)
1030 {
1031 timings->vblank = fb_get_vblank(timings->hfreq);
1032 timings->vtotal = timings->vactive + timings->vblank;
1033 timings->vfreq = timings->hfreq/timings->vtotal;
1034 timings->hblank = fb_get_hblank_by_hfreq(timings->hfreq,
1035 timings->hactive);
1036 timings->htotal = timings->hactive + timings->hblank;
1037 timings->dclk = timings->htotal * timings->hfreq;
1038 }
1039
1040 static void fb_timings_dclk(struct __fb_timings *timings)
1041 {
1042 timings->hblank = fb_get_hblank_by_dclk(timings->dclk,
1043 timings->hactive);
1044 timings->htotal = timings->hactive + timings->hblank;
1045 timings->hfreq = timings->dclk/timings->htotal;
1046 timings->vblank = fb_get_vblank(timings->hfreq);
1047 timings->vtotal = timings->vactive + timings->vblank;
1048 timings->vfreq = timings->hfreq/timings->vtotal;
1049 }
1050
1051 /*
1052 * fb_get_mode - calculates video mode using VESA GTF
1053 * @flags: if: 0 - maximize vertical refresh rate
1054 * 1 - vrefresh-driven calculation;
1055 * 2 - hscan-driven calculation;
1056 * 3 - pixelclock-driven calculation;
1057 * @val: depending on @flags, ignored, vrefresh, hsync or pixelclock
1058 * @var: pointer to fb_var_screeninfo
1059 * @info: pointer to fb_info
1060 *
1061 * DESCRIPTION:
1062 * Calculates video mode based on monitor specs using VESA GTF.
1063 * The GTF is best for VESA GTF compliant monitors but is
1064 * specifically formulated to work for older monitors as well.
1065 *
1066 * If @flag==0, the function will attempt to maximize the
1067 * refresh rate. Otherwise, it will calculate timings based on
1068 * the flag and accompanying value.
1069 *
1070 * If FB_IGNOREMON bit is set in @flags, monitor specs will be
1071 * ignored and @var will be filled with the calculated timings.
1072 *
1073 * All calculations are based on the VESA GTF Spreadsheet
1074 * available at VESA's public ftp (http://www.vesa.org).
1075 *
1076 * NOTES:
1077 * The timings generated by the GTF will be different from VESA
1078 * DMT. It might be a good idea to keep a table of standard
1079 * VESA modes as well. The GTF may also not work for some displays,
1080 * such as, and especially, analog TV.
1081 *
1082 * REQUIRES:
1083 * A valid info->monspecs, otherwise 'safe numbers' will be used.
1084 */
1085 int fb_get_mode(int flags, u32 val, struct fb_var_screeninfo *var, struct fb_info *info)
1086 {
1087 struct __fb_timings timings;
1088 u32 interlace = 1, dscan = 1;
1089 u32 hfmin, hfmax, vfmin, vfmax, dclkmin, dclkmax;
1090
1091 /*
1092 * If monspecs are invalid, use values that are enough
1093 * for 640x480@60
1094 */
1095 if (!info->monspecs.hfmax || !info->monspecs.vfmax ||
1096 !info->monspecs.dclkmax ||
1097 info->monspecs.hfmax < info->monspecs.hfmin ||
1098 info->monspecs.vfmax < info->monspecs.vfmin ||
1099 info->monspecs.dclkmax < info->monspecs.dclkmin) {
1100 hfmin = 29000; hfmax = 30000;
1101 vfmin = 60; vfmax = 60;
1102 dclkmin = 0; dclkmax = 25000000;
1103 } else {
1104 hfmin = info->monspecs.hfmin;
1105 hfmax = info->monspecs.hfmax;
1106 vfmin = info->monspecs.vfmin;
1107 vfmax = info->monspecs.vfmax;
1108 dclkmin = info->monspecs.dclkmin;
1109 dclkmax = info->monspecs.dclkmax;
1110 }
1111
1112 memset(&timings, 0, sizeof(struct __fb_timings));
1113 timings.hactive = var->xres;
1114 timings.vactive = var->yres;
1115 if (var->vmode & FB_VMODE_INTERLACED) {
1116 timings.vactive /= 2;
1117 interlace = 2;
1118 }
1119 if (var->vmode & FB_VMODE_DOUBLE) {
1120 timings.vactive *= 2;
1121 dscan = 2;
1122 }
1123
1124 switch (flags & ~FB_IGNOREMON) {
1125 case FB_MAXTIMINGS: /* maximize refresh rate */
1126 timings.hfreq = hfmax;
1127 fb_timings_hfreq(&timings);
1128 if (timings.vfreq > vfmax) {
1129 timings.vfreq = vfmax;
1130 fb_timings_vfreq(&timings);
1131 }
1132 if (timings.dclk > dclkmax) {
1133 timings.dclk = dclkmax;
1134 fb_timings_dclk(&timings);
1135 }
1136 break;
1137 case FB_VSYNCTIMINGS: /* vrefresh driven */
1138 timings.vfreq = val;
1139 fb_timings_vfreq(&timings);
1140 break;
1141 case FB_HSYNCTIMINGS: /* hsync driven */
1142 timings.hfreq = val;
1143 fb_timings_hfreq(&timings);
1144 break;
1145 case FB_DCLKTIMINGS: /* pixelclock driven */
1146 timings.dclk = PICOS2KHZ(val) * 1000;
1147 fb_timings_dclk(&timings);
1148 break;
1149 default:
1150 return -EINVAL;
1151
1152 }
1153
1154 if (!(flags & FB_IGNOREMON) &&
1155 (timings.vfreq < vfmin || timings.vfreq > vfmax ||
1156 timings.hfreq < hfmin || timings.hfreq > hfmax ||
1157 timings.dclk < dclkmin || timings.dclk > dclkmax))
1158 return -EINVAL;
1159
1160 var->pixclock = KHZ2PICOS(timings.dclk/1000);
1161 var->hsync_len = (timings.htotal * 8)/100;
1162 var->right_margin = (timings.hblank/2) - var->hsync_len;
1163 var->left_margin = timings.hblank - var->right_margin - var->hsync_len;
1164
1165 var->vsync_len = (3 * interlace)/dscan;
1166 var->lower_margin = (1 * interlace)/dscan;
1167 var->upper_margin = (timings.vblank * interlace)/dscan -
1168 (var->vsync_len + var->lower_margin);
1169
1170 return 0;
1171 }
1172 #else
1173 int fb_parse_edid(unsigned char *edid, struct fb_var_screeninfo *var)
1174 {
1175 return 1;
1176 }
1177 void fb_edid_to_monspecs(unsigned char *edid, struct fb_monspecs *specs)
1178 {
1179 specs = NULL;
1180 }
1181 void fb_destroy_modedb(struct fb_videomode *modedb)
1182 {
1183 }
1184 int fb_get_mode(int flags, u32 val, struct fb_var_screeninfo *var,
1185 struct fb_info *info)
1186 {
1187 return -EINVAL;
1188 }
1189 #endif /* CONFIG_FB_MODE_HELPERS */
1190
1191 /*
1192 * fb_validate_mode - validates var against monitor capabilities
1193 * @var: pointer to fb_var_screeninfo
1194 * @info: pointer to fb_info
1195 *
1196 * DESCRIPTION:
1197 * Validates video mode against monitor capabilities specified in
1198 * info->monspecs.
1199 *
1200 * REQUIRES:
1201 * A valid info->monspecs.
1202 */
1203 int fb_validate_mode(const struct fb_var_screeninfo *var, struct fb_info *info)
1204 {
1205 u32 hfreq, vfreq, htotal, vtotal, pixclock;
1206 u32 hfmin, hfmax, vfmin, vfmax, dclkmin, dclkmax;
1207
1208 /*
1209 * If monspecs are invalid, use values that are enough
1210 * for 640x480@60
1211 */
1212 if (!info->monspecs.hfmax || !info->monspecs.vfmax ||
1213 !info->monspecs.dclkmax ||
1214 info->monspecs.hfmax < info->monspecs.hfmin ||
1215 info->monspecs.vfmax < info->monspecs.vfmin ||
1216 info->monspecs.dclkmax < info->monspecs.dclkmin) {
1217 hfmin = 29000; hfmax = 30000;
1218 vfmin = 60; vfmax = 60;
1219 dclkmin = 0; dclkmax = 25000000;
1220 } else {
1221 hfmin = info->monspecs.hfmin;
1222 hfmax = info->monspecs.hfmax;
1223 vfmin = info->monspecs.vfmin;
1224 vfmax = info->monspecs.vfmax;
1225 dclkmin = info->monspecs.dclkmin;
1226 dclkmax = info->monspecs.dclkmax;
1227 }
1228
1229 if (!var->pixclock)
1230 return -EINVAL;
1231 pixclock = PICOS2KHZ(var->pixclock) * 1000;
1232
1233 htotal = var->xres + var->right_margin + var->hsync_len +
1234 var->left_margin;
1235 vtotal = var->yres + var->lower_margin + var->vsync_len +
1236 var->upper_margin;
1237
1238 if (var->vmode & FB_VMODE_INTERLACED)
1239 vtotal /= 2;
1240 if (var->vmode & FB_VMODE_DOUBLE)
1241 vtotal *= 2;
1242
1243 hfreq = pixclock/htotal;
1244 hfreq = (hfreq + 500) / 1000 * 1000;
1245
1246 vfreq = hfreq/vtotal;
1247
1248 return (vfreq < vfmin || vfreq > vfmax ||
1249 hfreq < hfmin || hfreq > hfmax ||
1250 pixclock < dclkmin || pixclock > dclkmax) ?
1251 -EINVAL : 0;
1252 }
1253
1254 EXPORT_SYMBOL(fb_parse_edid);
1255 EXPORT_SYMBOL(fb_edid_to_monspecs);
1256
1257 EXPORT_SYMBOL(fb_get_mode);
1258 EXPORT_SYMBOL(fb_validate_mode);
1259 EXPORT_SYMBOL(fb_destroy_modedb);
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