videomode: combine videomode dmt_flags and data_flags
[linux-3.10.git] / drivers / video / fbmon.c
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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  */
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  */
676 void fb_destroy_modedb(struct fb_videomode *modedb)
677 {
678         kfree(modedb);
679 }
680
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
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
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
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  */
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                 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
1084 struct __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  */
1111 static 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  */
1140 static 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  */
1174 static 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
1208 static 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
1217 static 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
1228 static 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
1239 static 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  */
1284 int 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
1380 int 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_HSYNC_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 }
1426 EXPORT_SYMBOL_GPL(fb_videomode_from_videomode);
1427
1428 #ifdef CONFIG_OF
1429 static 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  */
1448 int 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 }
1466 EXPORT_SYMBOL_GPL(of_get_fb_videomode);
1467 #endif /* CONFIG_OF */
1468 #endif /* CONFIG_VIDEOMODE_HELPERS */
1469
1470 #else
1471 int fb_parse_edid(unsigned char *edid, struct fb_var_screeninfo *var)
1472 {
1473         return 1;
1474 }
1475 void fb_edid_to_monspecs(unsigned char *edid, struct fb_monspecs *specs)
1476 {
1477         specs = NULL;
1478 }
1479 void fb_edid_add_monspecs(unsigned char *edid, struct fb_monspecs *specs)
1480 {
1481 }
1482 void fb_destroy_modedb(struct fb_videomode *modedb)
1483 {
1484 }
1485 int 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  */
1504 int 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
1562 const 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
1580 const unsigned char *fb_firmware_edid(struct device *device)
1581 {
1582         return NULL;
1583 }
1584 #endif
1585 EXPORT_SYMBOL(fb_firmware_edid);
1586
1587 EXPORT_SYMBOL(fb_parse_edid);
1588 EXPORT_SYMBOL(fb_edid_to_monspecs);
1589 EXPORT_SYMBOL(fb_edid_add_monspecs);
1590 EXPORT_SYMBOL(fb_get_mode);
1591 EXPORT_SYMBOL(fb_validate_mode);
1592 EXPORT_SYMBOL(fb_destroy_modedb);