1 /*
2 * linux/drivers/video/fbmon.c
3 *
4 * Copyright (C) 2002 James Simmons <jsimmons@users.sf.net>
5 *
6 * Credits:
7 *
8 * The EDID Parser is a conglomeration from the following sources:
9 *
10 * 1. SciTech SNAP Graphics Architecture
11 * Copyright (C) 1991-2002 SciTech Software, Inc. All rights reserved.
12 *
13 * 2. XFree86 4.3.0, interpret_edid.c
14 * Copyright 1998 by Egbert Eich <Egbert.Eich@Physik.TU-Darmstadt.DE>
15 *
16 * 3. John Fremlin <vii@users.sourceforge.net> and
17 * Ani Joshi <ajoshi@unixbox.com>
18 *
19 * Generalized Timing Formula is derived from:
20 *
21 * GTF Spreadsheet by Andy Morrish (1/5/97)
22 * available at https://www.vesa.org
23 *
24 * This file is subject to the terms and conditions of the GNU General Public
25 * License. See the file COPYING in the main directory of this archive
26 * for more details.
27 *
28 */
29 #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 #include "../edid.h"
37
38 /*
39 * EDID parser
40 */
41
42 #undef DEBUG /* define this for verbose EDID parsing output */
43
44 #ifdef DEBUG
45 #define DPRINTK(fmt, args...) printk(fmt,## args)
46 #else
47 #define DPRINTK(fmt, args...) no_printk(fmt, ##args)
48 #endif
49
50 #define FBMON_FIX_HEADER 1
51 #define FBMON_FIX_INPUT 2
52 #define FBMON_FIX_TIMINGS 3
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 const 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 /* Sharp UXGA? */
75 {
76 .manufacturer = "SHP",
77 .model = 0x138e,
78 .fix = FBMON_FIX_TIMINGS,
79 },
80 };
81
82 static const unsigned char edid_v1_header[] = { 0x00, 0xff, 0xff, 0xff,
83 0xff, 0xff, 0xff, 0x00
84 };
85
copy_string(unsigned char * c,unsigned char * s)86 static void copy_string(unsigned char *c, unsigned char *s)
87 {
88 int i;
89 c = c + 5;
90 for (i = 0; (i < 13 && *c != 0x0A); i++)
91 *(s++) = *(c++);
92 *s = 0;
93 while (i-- && (*--s == 0x20)) *s = 0;
94 }
95
edid_is_serial_block(unsigned char * block)96 static int edid_is_serial_block(unsigned char *block)
97 {
98 if ((block[0] == 0x00) && (block[1] == 0x00) &&
99 (block[2] == 0x00) && (block[3] == 0xff) &&
100 (block[4] == 0x00))
101 return 1;
102 else
103 return 0;
104 }
105
edid_is_ascii_block(unsigned char * block)106 static int edid_is_ascii_block(unsigned char *block)
107 {
108 if ((block[0] == 0x00) && (block[1] == 0x00) &&
109 (block[2] == 0x00) && (block[3] == 0xfe) &&
110 (block[4] == 0x00))
111 return 1;
112 else
113 return 0;
114 }
115
edid_is_limits_block(unsigned char * block)116 static int edid_is_limits_block(unsigned char *block)
117 {
118 if ((block[0] == 0x00) && (block[1] == 0x00) &&
119 (block[2] == 0x00) && (block[3] == 0xfd) &&
120 (block[4] == 0x00))
121 return 1;
122 else
123 return 0;
124 }
125
edid_is_monitor_block(unsigned char * block)126 static int edid_is_monitor_block(unsigned char *block)
127 {
128 if ((block[0] == 0x00) && (block[1] == 0x00) &&
129 (block[2] == 0x00) && (block[3] == 0xfc) &&
130 (block[4] == 0x00))
131 return 1;
132 else
133 return 0;
134 }
135
edid_is_timing_block(unsigned char * block)136 static int edid_is_timing_block(unsigned char *block)
137 {
138 if ((block[0] != 0x00) || (block[1] != 0x00) ||
139 (block[2] != 0x00) || (block[4] != 0x00))
140 return 1;
141 else
142 return 0;
143 }
144
check_edid(unsigned char * edid)145 static int check_edid(unsigned char *edid)
146 {
147 unsigned char *block = edid + ID_MANUFACTURER_NAME, manufacturer[4];
148 unsigned char *b;
149 u32 model;
150 int i, fix = 0, ret = 0;
151
152 manufacturer[0] = ((block[0] & 0x7c) >> 2) + '@';
153 manufacturer[1] = ((block[0] & 0x03) << 3) +
154 ((block[1] & 0xe0) >> 5) + '@';
155 manufacturer[2] = (block[1] & 0x1f) + '@';
156 manufacturer[3] = 0;
157 model = block[2] + (block[3] << 8);
158
159 for (i = 0; i < ARRAY_SIZE(brokendb); i++) {
160 if (!strncmp(manufacturer, brokendb[i].manufacturer, 4) &&
161 brokendb[i].model == model) {
162 fix = brokendb[i].fix;
163 break;
164 }
165 }
166
167 switch (fix) {
168 case FBMON_FIX_HEADER:
169 for (i = 0; i < 8; i++) {
170 if (edid[i] != edid_v1_header[i]) {
171 ret = fix;
172 break;
173 }
174 }
175 break;
176 case FBMON_FIX_INPUT:
177 b = edid + EDID_STRUCT_DISPLAY;
178 /* Only if display is GTF capable will
179 the input type be reset to analog */
180 if (b[4] & 0x01 && b[0] & 0x80)
181 ret = fix;
182 break;
183 case FBMON_FIX_TIMINGS:
184 b = edid + DETAILED_TIMING_DESCRIPTIONS_START;
185 ret = fix;
186
187 for (i = 0; i < 4; i++) {
188 if (edid_is_limits_block(b)) {
189 ret = 0;
190 break;
191 }
192
193 b += DETAILED_TIMING_DESCRIPTION_SIZE;
194 }
195
196 break;
197 }
198
199 if (ret)
200 printk("fbmon: The EDID Block of "
201 "Manufacturer: %s Model: 0x%x is known to "
202 "be broken,\n", manufacturer, model);
203
204 return ret;
205 }
206
fix_edid(unsigned char * edid,int fix)207 static void fix_edid(unsigned char *edid, int fix)
208 {
209 int i;
210 unsigned char *b, csum = 0;
211
212 switch (fix) {
213 case FBMON_FIX_HEADER:
214 printk("fbmon: trying a header reconstruct\n");
215 memcpy(edid, edid_v1_header, 8);
216 break;
217 case FBMON_FIX_INPUT:
218 printk("fbmon: trying to fix input type\n");
219 b = edid + EDID_STRUCT_DISPLAY;
220 b[0] &= ~0x80;
221 edid[127] += 0x80;
222 break;
223 case FBMON_FIX_TIMINGS:
224 printk("fbmon: trying to fix monitor timings\n");
225 b = edid + DETAILED_TIMING_DESCRIPTIONS_START;
226 for (i = 0; i < 4; i++) {
227 if (!(edid_is_serial_block(b) ||
228 edid_is_ascii_block(b) ||
229 edid_is_monitor_block(b) ||
230 edid_is_timing_block(b))) {
231 b[0] = 0x00;
232 b[1] = 0x00;
233 b[2] = 0x00;
234 b[3] = 0xfd;
235 b[4] = 0x00;
236 b[5] = 60; /* vfmin */
237 b[6] = 60; /* vfmax */
238 b[7] = 30; /* hfmin */
239 b[8] = 75; /* hfmax */
240 b[9] = 17; /* pixclock - 170 MHz*/
241 b[10] = 0; /* GTF */
242 break;
243 }
244
245 b += DETAILED_TIMING_DESCRIPTION_SIZE;
246 }
247
248 for (i = 0; i < EDID_LENGTH - 1; i++)
249 csum += edid[i];
250
251 edid[127] = 256 - csum;
252 break;
253 }
254 }
255
edid_checksum(unsigned char * edid)256 static int edid_checksum(unsigned char *edid)
257 {
258 unsigned char csum = 0, all_null = 0;
259 int i, err = 0, fix = check_edid(edid);
260
261 if (fix)
262 fix_edid(edid, fix);
263
264 for (i = 0; i < EDID_LENGTH; i++) {
265 csum += edid[i];
266 all_null |= edid[i];
267 }
268
269 if (csum == 0x00 && all_null) {
270 /* checksum passed, everything's good */
271 err = 1;
272 }
273
274 return err;
275 }
276
edid_check_header(unsigned char * edid)277 static int edid_check_header(unsigned char *edid)
278 {
279 int i, err = 1, fix = check_edid(edid);
280
281 if (fix)
282 fix_edid(edid, fix);
283
284 for (i = 0; i < 8; i++) {
285 if (edid[i] != edid_v1_header[i])
286 err = 0;
287 }
288
289 return err;
290 }
291
parse_vendor_block(unsigned char * block,struct fb_monspecs * specs)292 static void parse_vendor_block(unsigned char *block, struct fb_monspecs *specs)
293 {
294 specs->manufacturer[0] = ((block[0] & 0x7c) >> 2) + '@';
295 specs->manufacturer[1] = ((block[0] & 0x03) << 3) +
296 ((block[1] & 0xe0) >> 5) + '@';
297 specs->manufacturer[2] = (block[1] & 0x1f) + '@';
298 specs->manufacturer[3] = 0;
299 specs->model = block[2] + (block[3] << 8);
300 specs->serial = block[4] + (block[5] << 8) +
301 (block[6] << 16) + (block[7] << 24);
302 specs->year = block[9] + 1990;
303 specs->week = block[8];
304 DPRINTK(" Manufacturer: %s\n", specs->manufacturer);
305 DPRINTK(" Model: %x\n", specs->model);
306 DPRINTK(" Serial#: %u\n", specs->serial);
307 DPRINTK(" Year: %u Week %u\n", specs->year, specs->week);
308 }
309
get_dpms_capabilities(unsigned char flags,struct fb_monspecs * specs)310 static void get_dpms_capabilities(unsigned char flags,
311 struct fb_monspecs *specs)
312 {
313 specs->dpms = 0;
314 if (flags & DPMS_ACTIVE_OFF)
315 specs->dpms |= FB_DPMS_ACTIVE_OFF;
316 if (flags & DPMS_SUSPEND)
317 specs->dpms |= FB_DPMS_SUSPEND;
318 if (flags & DPMS_STANDBY)
319 specs->dpms |= FB_DPMS_STANDBY;
320 DPRINTK(" DPMS: Active %s, Suspend %s, Standby %s\n",
321 (flags & DPMS_ACTIVE_OFF) ? "yes" : "no",
322 (flags & DPMS_SUSPEND) ? "yes" : "no",
323 (flags & DPMS_STANDBY) ? "yes" : "no");
324 }
325
get_chroma(unsigned char * block,struct fb_monspecs * specs)326 static void get_chroma(unsigned char *block, struct fb_monspecs *specs)
327 {
328 int tmp;
329
330 DPRINTK(" Chroma\n");
331 /* Chromaticity data */
332 tmp = ((block[5] & (3 << 6)) >> 6) | (block[0x7] << 2);
333 tmp *= 1000;
334 tmp += 512;
335 specs->chroma.redx = tmp/1024;
336 DPRINTK(" RedX: 0.%03d ", specs->chroma.redx);
337
338 tmp = ((block[5] & (3 << 4)) >> 4) | (block[0x8] << 2);
339 tmp *= 1000;
340 tmp += 512;
341 specs->chroma.redy = tmp/1024;
342 DPRINTK("RedY: 0.%03d\n", specs->chroma.redy);
343
344 tmp = ((block[5] & (3 << 2)) >> 2) | (block[0x9] << 2);
345 tmp *= 1000;
346 tmp += 512;
347 specs->chroma.greenx = tmp/1024;
348 DPRINTK(" GreenX: 0.%03d ", specs->chroma.greenx);
349
350 tmp = (block[5] & 3) | (block[0xa] << 2);
351 tmp *= 1000;
352 tmp += 512;
353 specs->chroma.greeny = tmp/1024;
354 DPRINTK("GreenY: 0.%03d\n", specs->chroma.greeny);
355
356 tmp = ((block[6] & (3 << 6)) >> 6) | (block[0xb] << 2);
357 tmp *= 1000;
358 tmp += 512;
359 specs->chroma.bluex = tmp/1024;
360 DPRINTK(" BlueX: 0.%03d ", specs->chroma.bluex);
361
362 tmp = ((block[6] & (3 << 4)) >> 4) | (block[0xc] << 2);
363 tmp *= 1000;
364 tmp += 512;
365 specs->chroma.bluey = tmp/1024;
366 DPRINTK("BlueY: 0.%03d\n", specs->chroma.bluey);
367
368 tmp = ((block[6] & (3 << 2)) >> 2) | (block[0xd] << 2);
369 tmp *= 1000;
370 tmp += 512;
371 specs->chroma.whitex = tmp/1024;
372 DPRINTK(" WhiteX: 0.%03d ", specs->chroma.whitex);
373
374 tmp = (block[6] & 3) | (block[0xe] << 2);
375 tmp *= 1000;
376 tmp += 512;
377 specs->chroma.whitey = tmp/1024;
378 DPRINTK("WhiteY: 0.%03d\n", specs->chroma.whitey);
379 }
380
calc_mode_timings(int xres,int yres,int refresh,struct fb_videomode * mode)381 static void calc_mode_timings(int xres, int yres, int refresh,
382 struct fb_videomode *mode)
383 {
384 struct fb_var_screeninfo *var;
385
386 var = kzalloc(sizeof(struct fb_var_screeninfo), GFP_KERNEL);
387
388 if (var) {
389 var->xres = xres;
390 var->yres = yres;
391 fb_get_mode(FB_VSYNCTIMINGS | FB_IGNOREMON,
392 refresh, var, NULL);
393 mode->xres = xres;
394 mode->yres = yres;
395 mode->pixclock = var->pixclock;
396 mode->refresh = refresh;
397 mode->left_margin = var->left_margin;
398 mode->right_margin = var->right_margin;
399 mode->upper_margin = var->upper_margin;
400 mode->lower_margin = var->lower_margin;
401 mode->hsync_len = var->hsync_len;
402 mode->vsync_len = var->vsync_len;
403 mode->vmode = 0;
404 mode->sync = 0;
405 kfree(var);
406 }
407 }
408
get_est_timing(unsigned char * block,struct fb_videomode * mode)409 static int get_est_timing(unsigned char *block, struct fb_videomode *mode)
410 {
411 int num = 0;
412 unsigned char c;
413
414 c = block[0];
415 if (c&0x80) {
416 calc_mode_timings(720, 400, 70, &mode[num]);
417 mode[num++].flag = FB_MODE_IS_CALCULATED;
418 DPRINTK(" 720x400@70Hz\n");
419 }
420 if (c&0x40) {
421 calc_mode_timings(720, 400, 88, &mode[num]);
422 mode[num++].flag = FB_MODE_IS_CALCULATED;
423 DPRINTK(" 720x400@88Hz\n");
424 }
425 if (c&0x20) {
426 mode[num++] = vesa_modes[3];
427 DPRINTK(" 640x480@60Hz\n");
428 }
429 if (c&0x10) {
430 calc_mode_timings(640, 480, 67, &mode[num]);
431 mode[num++].flag = FB_MODE_IS_CALCULATED;
432 DPRINTK(" 640x480@67Hz\n");
433 }
434 if (c&0x08) {
435 mode[num++] = vesa_modes[4];
436 DPRINTK(" 640x480@72Hz\n");
437 }
438 if (c&0x04) {
439 mode[num++] = vesa_modes[5];
440 DPRINTK(" 640x480@75Hz\n");
441 }
442 if (c&0x02) {
443 mode[num++] = vesa_modes[7];
444 DPRINTK(" 800x600@56Hz\n");
445 }
446 if (c&0x01) {
447 mode[num++] = vesa_modes[8];
448 DPRINTK(" 800x600@60Hz\n");
449 }
450
451 c = block[1];
452 if (c&0x80) {
453 mode[num++] = vesa_modes[9];
454 DPRINTK(" 800x600@72Hz\n");
455 }
456 if (c&0x40) {
457 mode[num++] = vesa_modes[10];
458 DPRINTK(" 800x600@75Hz\n");
459 }
460 if (c&0x20) {
461 calc_mode_timings(832, 624, 75, &mode[num]);
462 mode[num++].flag = FB_MODE_IS_CALCULATED;
463 DPRINTK(" 832x624@75Hz\n");
464 }
465 if (c&0x10) {
466 mode[num++] = vesa_modes[12];
467 DPRINTK(" 1024x768@87Hz Interlaced\n");
468 }
469 if (c&0x08) {
470 mode[num++] = vesa_modes[13];
471 DPRINTK(" 1024x768@60Hz\n");
472 }
473 if (c&0x04) {
474 mode[num++] = vesa_modes[14];
475 DPRINTK(" 1024x768@70Hz\n");
476 }
477 if (c&0x02) {
478 mode[num++] = vesa_modes[15];
479 DPRINTK(" 1024x768@75Hz\n");
480 }
481 if (c&0x01) {
482 mode[num++] = vesa_modes[21];
483 DPRINTK(" 1280x1024@75Hz\n");
484 }
485 c = block[2];
486 if (c&0x80) {
487 mode[num++] = vesa_modes[17];
488 DPRINTK(" 1152x870@75Hz\n");
489 }
490 DPRINTK(" Manufacturer's mask: %x\n",c&0x7F);
491 return num;
492 }
493
get_std_timing(unsigned char * block,struct fb_videomode * mode,int ver,int rev,const struct fb_monspecs * specs)494 static int get_std_timing(unsigned char *block, struct fb_videomode *mode,
495 int ver, int rev, const struct fb_monspecs *specs)
496 {
497 int i;
498
499 for (i = 0; i < DMT_SIZE; i++) {
500 u32 std_2byte_code = block[0] << 8 | block[1];
501 if (std_2byte_code == dmt_modes[i].std_2byte_code)
502 break;
503 }
504
505 if (i < DMT_SIZE && dmt_modes[i].mode) {
506 /* DMT mode found */
507 *mode = *dmt_modes[i].mode;
508 mode->flag |= FB_MODE_IS_STANDARD;
509 DPRINTK(" DMT id=%d\n", dmt_modes[i].dmt_id);
510
511 } else {
512 int xres, yres = 0, refresh, ratio;
513
514 xres = (block[0] + 31) * 8;
515 if (xres <= 256)
516 return 0;
517
518 ratio = (block[1] & 0xc0) >> 6;
519 switch (ratio) {
520 case 0:
521 /* in EDID 1.3 the meaning of 0 changed to 16:10 (prior 1:1) */
522 if (ver < 1 || (ver == 1 && rev < 3))
523 yres = xres;
524 else
525 yres = (xres * 10)/16;
526 break;
527 case 1:
528 yres = (xres * 3)/4;
529 break;
530 case 2:
531 yres = (xres * 4)/5;
532 break;
533 case 3:
534 yres = (xres * 9)/16;
535 break;
536 }
537 refresh = (block[1] & 0x3f) + 60;
538 DPRINTK(" %dx%d@%dHz\n", xres, yres, refresh);
539
540 calc_mode_timings(xres, yres, refresh, mode);
541 }
542
543 /* Check the mode we got is within valid spec of the monitor */
544 if (specs && specs->dclkmax
545 && PICOS2KHZ(mode->pixclock) * 1000 > specs->dclkmax) {
546 DPRINTK(" mode exceed max DCLK\n");
547 return 0;
548 }
549
550 return 1;
551 }
552
get_dst_timing(unsigned char * block,struct fb_videomode * mode,int ver,int rev,const struct fb_monspecs * specs)553 static int get_dst_timing(unsigned char *block, struct fb_videomode *mode,
554 int ver, int rev, const struct fb_monspecs *specs)
555 {
556 int j, num = 0;
557
558 for (j = 0; j < 6; j++, block += STD_TIMING_DESCRIPTION_SIZE)
559 num += get_std_timing(block, &mode[num], ver, rev, specs);
560
561 return num;
562 }
563
get_detailed_timing(unsigned char * block,struct fb_videomode * mode)564 static void get_detailed_timing(unsigned char *block,
565 struct fb_videomode *mode)
566 {
567 mode->xres = H_ACTIVE;
568 mode->yres = V_ACTIVE;
569 mode->pixclock = PIXEL_CLOCK;
570 mode->pixclock /= 1000;
571 mode->pixclock = KHZ2PICOS(mode->pixclock);
572 mode->right_margin = H_SYNC_OFFSET;
573 mode->left_margin = (H_ACTIVE + H_BLANKING) -
574 (H_ACTIVE + H_SYNC_OFFSET + H_SYNC_WIDTH);
575 mode->upper_margin = V_BLANKING - V_SYNC_OFFSET -
576 V_SYNC_WIDTH;
577 mode->lower_margin = V_SYNC_OFFSET;
578 mode->hsync_len = H_SYNC_WIDTH;
579 mode->vsync_len = V_SYNC_WIDTH;
580 if (HSYNC_POSITIVE)
581 mode->sync |= FB_SYNC_HOR_HIGH_ACT;
582 if (VSYNC_POSITIVE)
583 mode->sync |= FB_SYNC_VERT_HIGH_ACT;
584 mode->refresh = PIXEL_CLOCK/((H_ACTIVE + H_BLANKING) *
585 (V_ACTIVE + V_BLANKING));
586 if (INTERLACED) {
587 mode->yres *= 2;
588 mode->upper_margin *= 2;
589 mode->lower_margin *= 2;
590 mode->vsync_len *= 2;
591 mode->vmode |= FB_VMODE_INTERLACED;
592 }
593 mode->flag = FB_MODE_IS_DETAILED;
594
595 DPRINTK(" %d MHz ", PIXEL_CLOCK/1000000);
596 DPRINTK("%d %d %d %d ", H_ACTIVE, H_ACTIVE + H_SYNC_OFFSET,
597 H_ACTIVE + H_SYNC_OFFSET + H_SYNC_WIDTH, H_ACTIVE + H_BLANKING);
598 DPRINTK("%d %d %d %d ", V_ACTIVE, V_ACTIVE + V_SYNC_OFFSET,
599 V_ACTIVE + V_SYNC_OFFSET + V_SYNC_WIDTH, V_ACTIVE + V_BLANKING);
600 DPRINTK("%sHSync %sVSync\n\n", (HSYNC_POSITIVE) ? "+" : "-",
601 (VSYNC_POSITIVE) ? "+" : "-");
602 }
603
604 /**
605 * fb_create_modedb - create video mode database
606 * @edid: EDID data
607 * @dbsize: database size
608 * @specs: monitor specifications, may be NULL
609 *
610 * RETURNS: struct fb_videomode, @dbsize contains length of database
611 *
612 * DESCRIPTION:
613 * This function builds a mode database using the contents of the EDID
614 * data
615 */
fb_create_modedb(unsigned char * edid,int * dbsize,const struct fb_monspecs * specs)616 static struct fb_videomode *fb_create_modedb(unsigned char *edid, int *dbsize,
617 const struct fb_monspecs *specs)
618 {
619 struct fb_videomode *mode, *m;
620 unsigned char *block;
621 int num = 0, i, first = 1;
622 int ver, rev;
623
624 mode = kcalloc(50, sizeof(struct fb_videomode), GFP_KERNEL);
625 if (mode == NULL)
626 return NULL;
627
628 if (edid == NULL || !edid_checksum(edid) ||
629 !edid_check_header(edid)) {
630 kfree(mode);
631 return NULL;
632 }
633
634 ver = edid[EDID_STRUCT_VERSION];
635 rev = edid[EDID_STRUCT_REVISION];
636
637 *dbsize = 0;
638
639 DPRINTK(" Detailed Timings\n");
640 block = edid + DETAILED_TIMING_DESCRIPTIONS_START;
641 for (i = 0; i < 4; i++, block+= DETAILED_TIMING_DESCRIPTION_SIZE) {
642 if (!(block[0] == 0x00 && block[1] == 0x00)) {
643 get_detailed_timing(block, &mode[num]);
644 if (first) {
645 mode[num].flag |= FB_MODE_IS_FIRST;
646 first = 0;
647 }
648 num++;
649 }
650 }
651
652 DPRINTK(" Supported VESA Modes\n");
653 block = edid + ESTABLISHED_TIMING_1;
654 num += get_est_timing(block, &mode[num]);
655
656 DPRINTK(" Standard Timings\n");
657 block = edid + STD_TIMING_DESCRIPTIONS_START;
658 for (i = 0; i < STD_TIMING; i++, block += STD_TIMING_DESCRIPTION_SIZE)
659 num += get_std_timing(block, &mode[num], ver, rev, specs);
660
661 block = edid + DETAILED_TIMING_DESCRIPTIONS_START;
662 for (i = 0; i < 4; i++, block+= DETAILED_TIMING_DESCRIPTION_SIZE) {
663 if (block[0] == 0x00 && block[1] == 0x00 && block[3] == 0xfa)
664 num += get_dst_timing(block + 5, &mode[num],
665 ver, rev, specs);
666 }
667
668 /* Yikes, EDID data is totally useless */
669 if (!num) {
670 kfree(mode);
671 return NULL;
672 }
673
674 *dbsize = num;
675 m = kmalloc_array(num, sizeof(struct fb_videomode), GFP_KERNEL);
676 if (!m)
677 return mode;
678 memmove(m, mode, num * sizeof(struct fb_videomode));
679 kfree(mode);
680 return m;
681 }
682
683 /**
684 * fb_destroy_modedb - destroys mode database
685 * @modedb: mode database to destroy
686 *
687 * DESCRIPTION:
688 * Destroy mode database created by fb_create_modedb
689 */
fb_destroy_modedb(struct fb_videomode * modedb)690 void fb_destroy_modedb(struct fb_videomode *modedb)
691 {
692 kfree(modedb);
693 }
694
fb_get_monitor_limits(unsigned char * edid,struct fb_monspecs * specs)695 static int fb_get_monitor_limits(unsigned char *edid, struct fb_monspecs *specs)
696 {
697 int i, retval = 1;
698 unsigned char *block;
699
700 block = edid + DETAILED_TIMING_DESCRIPTIONS_START;
701
702 DPRINTK(" Monitor Operating Limits: ");
703
704 for (i = 0; i < 4; i++, block += DETAILED_TIMING_DESCRIPTION_SIZE) {
705 if (edid_is_limits_block(block)) {
706 specs->hfmin = H_MIN_RATE * 1000;
707 specs->hfmax = H_MAX_RATE * 1000;
708 specs->vfmin = V_MIN_RATE;
709 specs->vfmax = V_MAX_RATE;
710 specs->dclkmax = MAX_PIXEL_CLOCK * 1000000;
711 specs->gtf = (GTF_SUPPORT) ? 1 : 0;
712 retval = 0;
713 DPRINTK("From EDID\n");
714 break;
715 }
716 }
717
718 /* estimate monitor limits based on modes supported */
719 if (retval) {
720 struct fb_videomode *modes, *mode;
721 int num_modes, hz, hscan, pixclock;
722 int vtotal, htotal;
723
724 modes = fb_create_modedb(edid, &num_modes, specs);
725 if (!modes) {
726 DPRINTK("None Available\n");
727 return 1;
728 }
729
730 retval = 0;
731 for (i = 0; i < num_modes; i++) {
732 mode = &modes[i];
733 pixclock = PICOS2KHZ(modes[i].pixclock) * 1000;
734 htotal = mode->xres + mode->right_margin + mode->hsync_len
735 + mode->left_margin;
736 vtotal = mode->yres + mode->lower_margin + mode->vsync_len
737 + mode->upper_margin;
738
739 if (mode->vmode & FB_VMODE_INTERLACED)
740 vtotal /= 2;
741
742 if (mode->vmode & FB_VMODE_DOUBLE)
743 vtotal *= 2;
744
745 hscan = (pixclock + htotal / 2) / htotal;
746 hscan = (hscan + 500) / 1000 * 1000;
747 hz = (hscan + vtotal / 2) / vtotal;
748
749 if (specs->dclkmax == 0 || specs->dclkmax < pixclock)
750 specs->dclkmax = pixclock;
751
752 if (specs->dclkmin == 0 || specs->dclkmin > pixclock)
753 specs->dclkmin = pixclock;
754
755 if (specs->hfmax == 0 || specs->hfmax < hscan)
756 specs->hfmax = hscan;
757
758 if (specs->hfmin == 0 || specs->hfmin > hscan)
759 specs->hfmin = hscan;
760
761 if (specs->vfmax == 0 || specs->vfmax < hz)
762 specs->vfmax = hz;
763
764 if (specs->vfmin == 0 || specs->vfmin > hz)
765 specs->vfmin = hz;
766 }
767 DPRINTK("Extrapolated\n");
768 fb_destroy_modedb(modes);
769 }
770 DPRINTK(" H: %d-%dKHz V: %d-%dHz DCLK: %dMHz\n",
771 specs->hfmin/1000, specs->hfmax/1000, specs->vfmin,
772 specs->vfmax, specs->dclkmax/1000000);
773 return retval;
774 }
775
get_monspecs(unsigned char * edid,struct fb_monspecs * specs)776 static void get_monspecs(unsigned char *edid, struct fb_monspecs *specs)
777 {
778 unsigned char c, *block;
779
780 block = edid + EDID_STRUCT_DISPLAY;
781
782 fb_get_monitor_limits(edid, specs);
783
784 c = block[0] & 0x80;
785 specs->input = 0;
786 if (c) {
787 specs->input |= FB_DISP_DDI;
788 DPRINTK(" Digital Display Input");
789 } else {
790 DPRINTK(" Analog Display Input: Input Voltage - ");
791 switch ((block[0] & 0x60) >> 5) {
792 case 0:
793 DPRINTK("0.700V/0.300V");
794 specs->input |= FB_DISP_ANA_700_300;
795 break;
796 case 1:
797 DPRINTK("0.714V/0.286V");
798 specs->input |= FB_DISP_ANA_714_286;
799 break;
800 case 2:
801 DPRINTK("1.000V/0.400V");
802 specs->input |= FB_DISP_ANA_1000_400;
803 break;
804 case 3:
805 DPRINTK("0.700V/0.000V");
806 specs->input |= FB_DISP_ANA_700_000;
807 break;
808 }
809 }
810 DPRINTK("\n Sync: ");
811 c = block[0] & 0x10;
812 if (c)
813 DPRINTK(" Configurable signal level\n");
814 c = block[0] & 0x0f;
815 specs->signal = 0;
816 if (c & 0x10) {
817 DPRINTK("Blank to Blank ");
818 specs->signal |= FB_SIGNAL_BLANK_BLANK;
819 }
820 if (c & 0x08) {
821 DPRINTK("Separate ");
822 specs->signal |= FB_SIGNAL_SEPARATE;
823 }
824 if (c & 0x04) {
825 DPRINTK("Composite ");
826 specs->signal |= FB_SIGNAL_COMPOSITE;
827 }
828 if (c & 0x02) {
829 DPRINTK("Sync on Green ");
830 specs->signal |= FB_SIGNAL_SYNC_ON_GREEN;
831 }
832 if (c & 0x01) {
833 DPRINTK("Serration on ");
834 specs->signal |= FB_SIGNAL_SERRATION_ON;
835 }
836 DPRINTK("\n");
837 specs->max_x = block[1];
838 specs->max_y = block[2];
839 DPRINTK(" Max H-size in cm: ");
840 if (specs->max_x)
841 DPRINTK("%d\n", specs->max_x);
842 else
843 DPRINTK("variable\n");
844 DPRINTK(" Max V-size in cm: ");
845 if (specs->max_y)
846 DPRINTK("%d\n", specs->max_y);
847 else
848 DPRINTK("variable\n");
849
850 c = block[3];
851 specs->gamma = c+100;
852 DPRINTK(" Gamma: ");
853 DPRINTK("%d.%d\n", specs->gamma/100, specs->gamma % 100);
854
855 get_dpms_capabilities(block[4], specs);
856
857 switch ((block[4] & 0x18) >> 3) {
858 case 0:
859 DPRINTK(" Monochrome/Grayscale\n");
860 specs->input |= FB_DISP_MONO;
861 break;
862 case 1:
863 DPRINTK(" RGB Color Display\n");
864 specs->input |= FB_DISP_RGB;
865 break;
866 case 2:
867 DPRINTK(" Non-RGB Multicolor Display\n");
868 specs->input |= FB_DISP_MULTI;
869 break;
870 default:
871 DPRINTK(" Unknown\n");
872 specs->input |= FB_DISP_UNKNOWN;
873 break;
874 }
875
876 get_chroma(block, specs);
877
878 specs->misc = 0;
879 c = block[4] & 0x7;
880 if (c & 0x04) {
881 DPRINTK(" Default color format is primary\n");
882 specs->misc |= FB_MISC_PRIM_COLOR;
883 }
884 if (c & 0x02) {
885 DPRINTK(" First DETAILED Timing is preferred\n");
886 specs->misc |= FB_MISC_1ST_DETAIL;
887 }
888 if (c & 0x01) {
889 printk(" Display is GTF capable\n");
890 specs->gtf = 1;
891 }
892 }
893
fb_parse_edid(unsigned char * edid,struct fb_var_screeninfo * var)894 int fb_parse_edid(unsigned char *edid, struct fb_var_screeninfo *var)
895 {
896 int i;
897 unsigned char *block;
898
899 if (edid == NULL || var == NULL)
900 return 1;
901
902 if (!(edid_checksum(edid)))
903 return 1;
904
905 if (!(edid_check_header(edid)))
906 return 1;
907
908 block = edid + DETAILED_TIMING_DESCRIPTIONS_START;
909
910 for (i = 0; i < 4; i++, block += DETAILED_TIMING_DESCRIPTION_SIZE) {
911 if (edid_is_timing_block(block)) {
912 var->xres = var->xres_virtual = H_ACTIVE;
913 var->yres = var->yres_virtual = V_ACTIVE;
914 var->height = var->width = 0;
915 var->right_margin = H_SYNC_OFFSET;
916 var->left_margin = (H_ACTIVE + H_BLANKING) -
917 (H_ACTIVE + H_SYNC_OFFSET + H_SYNC_WIDTH);
918 var->upper_margin = V_BLANKING - V_SYNC_OFFSET -
919 V_SYNC_WIDTH;
920 var->lower_margin = V_SYNC_OFFSET;
921 var->hsync_len = H_SYNC_WIDTH;
922 var->vsync_len = V_SYNC_WIDTH;
923 var->pixclock = PIXEL_CLOCK;
924 var->pixclock /= 1000;
925 var->pixclock = KHZ2PICOS(var->pixclock);
926
927 if (HSYNC_POSITIVE)
928 var->sync |= FB_SYNC_HOR_HIGH_ACT;
929 if (VSYNC_POSITIVE)
930 var->sync |= FB_SYNC_VERT_HIGH_ACT;
931 return 0;
932 }
933 }
934 return 1;
935 }
936
fb_edid_to_monspecs(unsigned char * edid,struct fb_monspecs * specs)937 void fb_edid_to_monspecs(unsigned char *edid, struct fb_monspecs *specs)
938 {
939 unsigned char *block;
940 int i, found = 0;
941
942 if (edid == NULL)
943 return;
944
945 if (!(edid_checksum(edid)))
946 return;
947
948 if (!(edid_check_header(edid)))
949 return;
950
951 memset(specs, 0, sizeof(struct fb_monspecs));
952
953 specs->version = edid[EDID_STRUCT_VERSION];
954 specs->revision = edid[EDID_STRUCT_REVISION];
955
956 DPRINTK("========================================\n");
957 DPRINTK("Display Information (EDID)\n");
958 DPRINTK("========================================\n");
959 DPRINTK(" EDID Version %d.%d\n", (int) specs->version,
960 (int) specs->revision);
961
962 parse_vendor_block(edid + ID_MANUFACTURER_NAME, specs);
963
964 block = edid + DETAILED_TIMING_DESCRIPTIONS_START;
965 for (i = 0; i < 4; i++, block += DETAILED_TIMING_DESCRIPTION_SIZE) {
966 if (edid_is_serial_block(block)) {
967 copy_string(block, specs->serial_no);
968 DPRINTK(" Serial Number: %s\n", specs->serial_no);
969 } else if (edid_is_ascii_block(block)) {
970 copy_string(block, specs->ascii);
971 DPRINTK(" ASCII Block: %s\n", specs->ascii);
972 } else if (edid_is_monitor_block(block)) {
973 copy_string(block, specs->monitor);
974 DPRINTK(" Monitor Name: %s\n", specs->monitor);
975 }
976 }
977
978 DPRINTK(" Display Characteristics:\n");
979 get_monspecs(edid, specs);
980
981 specs->modedb = fb_create_modedb(edid, &specs->modedb_len, specs);
982 if (!specs->modedb)
983 return;
984
985 /*
986 * Workaround for buggy EDIDs that sets that the first
987 * detailed timing is preferred but has not detailed
988 * timing specified
989 */
990 for (i = 0; i < specs->modedb_len; i++) {
991 if (specs->modedb[i].flag & FB_MODE_IS_DETAILED) {
992 found = 1;
993 break;
994 }
995 }
996
997 if (!found)
998 specs->misc &= ~FB_MISC_1ST_DETAIL;
999
1000 DPRINTK("========================================\n");
1001 }
1002
1003 /*
1004 * VESA Generalized Timing Formula (GTF)
1005 */
1006
1007 #define FLYBACK 550
1008 #define V_FRONTPORCH 1
1009 #define H_OFFSET 40
1010 #define H_SCALEFACTOR 20
1011 #define H_BLANKSCALE 128
1012 #define H_GRADIENT 600
1013 #define C_VAL 30
1014 #define M_VAL 300
1015
1016 struct __fb_timings {
1017 u32 dclk;
1018 u32 hfreq;
1019 u32 vfreq;
1020 u32 hactive;
1021 u32 vactive;
1022 u32 hblank;
1023 u32 vblank;
1024 u32 htotal;
1025 u32 vtotal;
1026 };
1027
1028 /**
1029 * fb_get_vblank - get vertical blank time
1030 * @hfreq: horizontal freq
1031 *
1032 * DESCRIPTION:
1033 * vblank = right_margin + vsync_len + left_margin
1034 *
1035 * given: right_margin = 1 (V_FRONTPORCH)
1036 * vsync_len = 3
1037 * flyback = 550
1038 *
1039 * flyback * hfreq
1040 * left_margin = --------------- - vsync_len
1041 * 1000000
1042 */
fb_get_vblank(u32 hfreq)1043 static u32 fb_get_vblank(u32 hfreq)
1044 {
1045 u32 vblank;
1046
1047 vblank = (hfreq * FLYBACK)/1000;
1048 vblank = (vblank + 500)/1000;
1049 return (vblank + V_FRONTPORCH);
1050 }
1051
1052 /**
1053 * fb_get_hblank_by_freq - get horizontal blank time given hfreq
1054 * @hfreq: horizontal freq
1055 * @xres: horizontal resolution in pixels
1056 *
1057 * DESCRIPTION:
1058 *
1059 * xres * duty_cycle
1060 * hblank = ------------------
1061 * 100 - duty_cycle
1062 *
1063 * duty cycle = percent of htotal assigned to inactive display
1064 * duty cycle = C - (M/Hfreq)
1065 *
1066 * where: C = ((offset - scale factor) * blank_scale)
1067 * -------------------------------------- + scale factor
1068 * 256
1069 * M = blank_scale * gradient
1070 *
1071 */
fb_get_hblank_by_hfreq(u32 hfreq,u32 xres)1072 static u32 fb_get_hblank_by_hfreq(u32 hfreq, u32 xres)
1073 {
1074 u32 c_val, m_val, duty_cycle, hblank;
1075
1076 c_val = (((H_OFFSET - H_SCALEFACTOR) * H_BLANKSCALE)/256 +
1077 H_SCALEFACTOR) * 1000;
1078 m_val = (H_BLANKSCALE * H_GRADIENT)/256;
1079 m_val = (m_val * 1000000)/hfreq;
1080 duty_cycle = c_val - m_val;
1081 hblank = (xres * duty_cycle)/(100000 - duty_cycle);
1082 return (hblank);
1083 }
1084
1085 /**
1086 * fb_get_hblank_by_dclk - get horizontal blank time given pixelclock
1087 * @dclk: pixelclock in Hz
1088 * @xres: horizontal resolution in pixels
1089 *
1090 * DESCRIPTION:
1091 *
1092 * xres * duty_cycle
1093 * hblank = ------------------
1094 * 100 - duty_cycle
1095 *
1096 * duty cycle = percent of htotal assigned to inactive display
1097 * duty cycle = C - (M * h_period)
1098 *
1099 * where: h_period = SQRT(100 - C + (0.4 * xres * M)/dclk) + C - 100
1100 * -----------------------------------------------
1101 * 2 * M
1102 * M = 300;
1103 * C = 30;
1104 */
fb_get_hblank_by_dclk(u32 dclk,u32 xres)1105 static u32 fb_get_hblank_by_dclk(u32 dclk, u32 xres)
1106 {
1107 u32 duty_cycle, h_period, hblank;
1108
1109 dclk /= 1000;
1110 h_period = 100 - C_VAL;
1111 h_period *= h_period;
1112 h_period += (M_VAL * xres * 2 * 1000)/(5 * dclk);
1113 h_period *= 10000;
1114
1115 h_period = int_sqrt(h_period);
1116 h_period -= (100 - C_VAL) * 100;
1117 h_period *= 1000;
1118 h_period /= 2 * M_VAL;
1119
1120 duty_cycle = C_VAL * 1000 - (M_VAL * h_period)/100;
1121 hblank = (xres * duty_cycle)/(100000 - duty_cycle) + 8;
1122 hblank &= ~15;
1123 return (hblank);
1124 }
1125
1126 /**
1127 * fb_get_hfreq - estimate hsync
1128 * @vfreq: vertical refresh rate
1129 * @yres: vertical resolution
1130 *
1131 * DESCRIPTION:
1132 *
1133 * (yres + front_port) * vfreq * 1000000
1134 * hfreq = -------------------------------------
1135 * (1000000 - (vfreq * FLYBACK)
1136 *
1137 */
1138
fb_get_hfreq(u32 vfreq,u32 yres)1139 static u32 fb_get_hfreq(u32 vfreq, u32 yres)
1140 {
1141 u32 divisor, hfreq;
1142
1143 divisor = (1000000 - (vfreq * FLYBACK))/1000;
1144 hfreq = (yres + V_FRONTPORCH) * vfreq * 1000;
1145 return (hfreq/divisor);
1146 }
1147
fb_timings_vfreq(struct __fb_timings * timings)1148 static void fb_timings_vfreq(struct __fb_timings *timings)
1149 {
1150 timings->hfreq = fb_get_hfreq(timings->vfreq, timings->vactive);
1151 timings->vblank = fb_get_vblank(timings->hfreq);
1152 timings->vtotal = timings->vactive + timings->vblank;
1153 timings->hblank = fb_get_hblank_by_hfreq(timings->hfreq,
1154 timings->hactive);
1155 timings->htotal = timings->hactive + timings->hblank;
1156 timings->dclk = timings->htotal * timings->hfreq;
1157 }
1158
fb_timings_hfreq(struct __fb_timings * timings)1159 static void fb_timings_hfreq(struct __fb_timings *timings)
1160 {
1161 timings->vblank = fb_get_vblank(timings->hfreq);
1162 timings->vtotal = timings->vactive + timings->vblank;
1163 timings->vfreq = timings->hfreq/timings->vtotal;
1164 timings->hblank = fb_get_hblank_by_hfreq(timings->hfreq,
1165 timings->hactive);
1166 timings->htotal = timings->hactive + timings->hblank;
1167 timings->dclk = timings->htotal * timings->hfreq;
1168 }
1169
fb_timings_dclk(struct __fb_timings * timings)1170 static void fb_timings_dclk(struct __fb_timings *timings)
1171 {
1172 timings->hblank = fb_get_hblank_by_dclk(timings->dclk,
1173 timings->hactive);
1174 timings->htotal = timings->hactive + timings->hblank;
1175 timings->hfreq = timings->dclk/timings->htotal;
1176 timings->vblank = fb_get_vblank(timings->hfreq);
1177 timings->vtotal = timings->vactive + timings->vblank;
1178 timings->vfreq = timings->hfreq/timings->vtotal;
1179 }
1180
1181 /*
1182 * fb_get_mode - calculates video mode using VESA GTF
1183 * @flags: if: 0 - maximize vertical refresh rate
1184 * 1 - vrefresh-driven calculation;
1185 * 2 - hscan-driven calculation;
1186 * 3 - pixelclock-driven calculation;
1187 * @val: depending on @flags, ignored, vrefresh, hsync or pixelclock
1188 * @var: pointer to fb_var_screeninfo
1189 * @info: pointer to fb_info
1190 *
1191 * DESCRIPTION:
1192 * Calculates video mode based on monitor specs using VESA GTF.
1193 * The GTF is best for VESA GTF compliant monitors but is
1194 * specifically formulated to work for older monitors as well.
1195 *
1196 * If @flag==0, the function will attempt to maximize the
1197 * refresh rate. Otherwise, it will calculate timings based on
1198 * the flag and accompanying value.
1199 *
1200 * If FB_IGNOREMON bit is set in @flags, monitor specs will be
1201 * ignored and @var will be filled with the calculated timings.
1202 *
1203 * All calculations are based on the VESA GTF Spreadsheet
1204 * available at VESA's public ftp (https://www.vesa.org).
1205 *
1206 * NOTES:
1207 * The timings generated by the GTF will be different from VESA
1208 * DMT. It might be a good idea to keep a table of standard
1209 * VESA modes as well. The GTF may also not work for some displays,
1210 * such as, and especially, analog TV.
1211 *
1212 * REQUIRES:
1213 * A valid info->monspecs, otherwise 'safe numbers' will be used.
1214 */
fb_get_mode(int flags,u32 val,struct fb_var_screeninfo * var,struct fb_info * info)1215 int fb_get_mode(int flags, u32 val, struct fb_var_screeninfo *var, struct fb_info *info)
1216 {
1217 struct __fb_timings *timings;
1218 u32 interlace = 1, dscan = 1;
1219 u32 hfmin, hfmax, vfmin, vfmax, dclkmin, dclkmax, err = 0;
1220
1221
1222 timings = kzalloc(sizeof(struct __fb_timings), GFP_KERNEL);
1223
1224 if (!timings)
1225 return -ENOMEM;
1226
1227 /*
1228 * If monspecs are invalid, use values that are enough
1229 * for 640x480@60
1230 */
1231 if (!info || !info->monspecs.hfmax || !info->monspecs.vfmax ||
1232 !info->monspecs.dclkmax ||
1233 info->monspecs.hfmax < info->monspecs.hfmin ||
1234 info->monspecs.vfmax < info->monspecs.vfmin ||
1235 info->monspecs.dclkmax < info->monspecs.dclkmin) {
1236 hfmin = 29000; hfmax = 30000;
1237 vfmin = 60; vfmax = 60;
1238 dclkmin = 0; dclkmax = 25000000;
1239 } else {
1240 hfmin = info->monspecs.hfmin;
1241 hfmax = info->monspecs.hfmax;
1242 vfmin = info->monspecs.vfmin;
1243 vfmax = info->monspecs.vfmax;
1244 dclkmin = info->monspecs.dclkmin;
1245 dclkmax = info->monspecs.dclkmax;
1246 }
1247
1248 timings->hactive = var->xres;
1249 timings->vactive = var->yres;
1250 if (var->vmode & FB_VMODE_INTERLACED) {
1251 timings->vactive /= 2;
1252 interlace = 2;
1253 }
1254 if (var->vmode & FB_VMODE_DOUBLE) {
1255 timings->vactive *= 2;
1256 dscan = 2;
1257 }
1258
1259 switch (flags & ~FB_IGNOREMON) {
1260 case FB_MAXTIMINGS: /* maximize refresh rate */
1261 timings->hfreq = hfmax;
1262 fb_timings_hfreq(timings);
1263 if (timings->vfreq > vfmax) {
1264 timings->vfreq = vfmax;
1265 fb_timings_vfreq(timings);
1266 }
1267 if (timings->dclk > dclkmax) {
1268 timings->dclk = dclkmax;
1269 fb_timings_dclk(timings);
1270 }
1271 break;
1272 case FB_VSYNCTIMINGS: /* vrefresh driven */
1273 timings->vfreq = val;
1274 fb_timings_vfreq(timings);
1275 break;
1276 case FB_HSYNCTIMINGS: /* hsync driven */
1277 timings->hfreq = val;
1278 fb_timings_hfreq(timings);
1279 break;
1280 case FB_DCLKTIMINGS: /* pixelclock driven */
1281 timings->dclk = PICOS2KHZ(val) * 1000;
1282 fb_timings_dclk(timings);
1283 break;
1284 default:
1285 err = -EINVAL;
1286
1287 }
1288
1289 if (err || (!(flags & FB_IGNOREMON) &&
1290 (timings->vfreq < vfmin || timings->vfreq > vfmax ||
1291 timings->hfreq < hfmin || timings->hfreq > hfmax ||
1292 timings->dclk < dclkmin || timings->dclk > dclkmax))) {
1293 err = -EINVAL;
1294 } else {
1295 var->pixclock = KHZ2PICOS(timings->dclk/1000);
1296 var->hsync_len = (timings->htotal * 8)/100;
1297 var->right_margin = (timings->hblank/2) - var->hsync_len;
1298 var->left_margin = timings->hblank - var->right_margin -
1299 var->hsync_len;
1300 var->vsync_len = (3 * interlace)/dscan;
1301 var->lower_margin = (1 * interlace)/dscan;
1302 var->upper_margin = (timings->vblank * interlace)/dscan -
1303 (var->vsync_len + var->lower_margin);
1304 }
1305
1306 kfree(timings);
1307 return err;
1308 }
1309
1310 #ifdef CONFIG_VIDEOMODE_HELPERS
fb_videomode_from_videomode(const struct videomode * vm,struct fb_videomode * fbmode)1311 int fb_videomode_from_videomode(const struct videomode *vm,
1312 struct fb_videomode *fbmode)
1313 {
1314 unsigned int htotal, vtotal;
1315
1316 fbmode->xres = vm->hactive;
1317 fbmode->left_margin = vm->hback_porch;
1318 fbmode->right_margin = vm->hfront_porch;
1319 fbmode->hsync_len = vm->hsync_len;
1320
1321 fbmode->yres = vm->vactive;
1322 fbmode->upper_margin = vm->vback_porch;
1323 fbmode->lower_margin = vm->vfront_porch;
1324 fbmode->vsync_len = vm->vsync_len;
1325
1326 /* prevent division by zero in KHZ2PICOS macro */
1327 fbmode->pixclock = vm->pixelclock ?
1328 KHZ2PICOS(vm->pixelclock / 1000) : 0;
1329
1330 fbmode->sync = 0;
1331 fbmode->vmode = 0;
1332 if (vm->flags & DISPLAY_FLAGS_HSYNC_HIGH)
1333 fbmode->sync |= FB_SYNC_HOR_HIGH_ACT;
1334 if (vm->flags & DISPLAY_FLAGS_VSYNC_HIGH)
1335 fbmode->sync |= FB_SYNC_VERT_HIGH_ACT;
1336 if (vm->flags & DISPLAY_FLAGS_INTERLACED)
1337 fbmode->vmode |= FB_VMODE_INTERLACED;
1338 if (vm->flags & DISPLAY_FLAGS_DOUBLESCAN)
1339 fbmode->vmode |= FB_VMODE_DOUBLE;
1340 fbmode->flag = 0;
1341
1342 htotal = vm->hactive + vm->hfront_porch + vm->hback_porch +
1343 vm->hsync_len;
1344 vtotal = vm->vactive + vm->vfront_porch + vm->vback_porch +
1345 vm->vsync_len;
1346 /* prevent division by zero */
1347 if (htotal && vtotal) {
1348 fbmode->refresh = vm->pixelclock / (htotal * vtotal);
1349 /* a mode must have htotal and vtotal != 0 or it is invalid */
1350 } else {
1351 fbmode->refresh = 0;
1352 return -EINVAL;
1353 }
1354
1355 return 0;
1356 }
1357 EXPORT_SYMBOL_GPL(fb_videomode_from_videomode);
1358
1359 #ifdef CONFIG_OF
dump_fb_videomode(const struct fb_videomode * m)1360 static inline void dump_fb_videomode(const struct fb_videomode *m)
1361 {
1362 pr_debug("fb_videomode = %ux%u@%uHz (%ukHz) %u %u %u %u %u %u %u %u %u\n",
1363 m->xres, m->yres, m->refresh, m->pixclock, m->left_margin,
1364 m->right_margin, m->upper_margin, m->lower_margin,
1365 m->hsync_len, m->vsync_len, m->sync, m->vmode, m->flag);
1366 }
1367
1368 /**
1369 * of_get_fb_videomode - get a fb_videomode from devicetree
1370 * @np: device_node with the timing specification
1371 * @fb: will be set to the return value
1372 * @index: index into the list of display timings in devicetree
1373 *
1374 * DESCRIPTION:
1375 * This function is expensive and should only be used, if only one mode is to be
1376 * read from DT. To get multiple modes start with of_get_display_timings ond
1377 * work with that instead.
1378 */
of_get_fb_videomode(struct device_node * np,struct fb_videomode * fb,int index)1379 int of_get_fb_videomode(struct device_node *np, struct fb_videomode *fb,
1380 int index)
1381 {
1382 struct videomode vm;
1383 int ret;
1384
1385 ret = of_get_videomode(np, &vm, index);
1386 if (ret)
1387 return ret;
1388
1389 ret = fb_videomode_from_videomode(&vm, fb);
1390 if (ret)
1391 return ret;
1392
1393 pr_debug("%pOF: got %dx%d display mode\n",
1394 np, vm.hactive, vm.vactive);
1395 dump_fb_videomode(fb);
1396
1397 return 0;
1398 }
1399 EXPORT_SYMBOL_GPL(of_get_fb_videomode);
1400 #endif /* CONFIG_OF */
1401 #endif /* CONFIG_VIDEOMODE_HELPERS */
1402
1403 #else
fb_parse_edid(unsigned char * edid,struct fb_var_screeninfo * var)1404 int fb_parse_edid(unsigned char *edid, struct fb_var_screeninfo *var)
1405 {
1406 return 1;
1407 }
fb_edid_to_monspecs(unsigned char * edid,struct fb_monspecs * specs)1408 void fb_edid_to_monspecs(unsigned char *edid, struct fb_monspecs *specs)
1409 {
1410 }
fb_destroy_modedb(struct fb_videomode * modedb)1411 void fb_destroy_modedb(struct fb_videomode *modedb)
1412 {
1413 }
fb_get_mode(int flags,u32 val,struct fb_var_screeninfo * var,struct fb_info * info)1414 int fb_get_mode(int flags, u32 val, struct fb_var_screeninfo *var,
1415 struct fb_info *info)
1416 {
1417 return -EINVAL;
1418 }
1419 #endif /* CONFIG_FB_MODE_HELPERS */
1420
1421 /*
1422 * fb_validate_mode - validates var against monitor capabilities
1423 * @var: pointer to fb_var_screeninfo
1424 * @info: pointer to fb_info
1425 *
1426 * DESCRIPTION:
1427 * Validates video mode against monitor capabilities specified in
1428 * info->monspecs.
1429 *
1430 * REQUIRES:
1431 * A valid info->monspecs.
1432 */
fb_validate_mode(const struct fb_var_screeninfo * var,struct fb_info * info)1433 int fb_validate_mode(const struct fb_var_screeninfo *var, struct fb_info *info)
1434 {
1435 u32 hfreq, vfreq, htotal, vtotal, pixclock;
1436 u32 hfmin, hfmax, vfmin, vfmax, dclkmin, dclkmax;
1437
1438 /*
1439 * If monspecs are invalid, use values that are enough
1440 * for 640x480@60
1441 */
1442 if (!info->monspecs.hfmax || !info->monspecs.vfmax ||
1443 !info->monspecs.dclkmax ||
1444 info->monspecs.hfmax < info->monspecs.hfmin ||
1445 info->monspecs.vfmax < info->monspecs.vfmin ||
1446 info->monspecs.dclkmax < info->monspecs.dclkmin) {
1447 hfmin = 29000; hfmax = 30000;
1448 vfmin = 60; vfmax = 60;
1449 dclkmin = 0; dclkmax = 25000000;
1450 } else {
1451 hfmin = info->monspecs.hfmin;
1452 hfmax = info->monspecs.hfmax;
1453 vfmin = info->monspecs.vfmin;
1454 vfmax = info->monspecs.vfmax;
1455 dclkmin = info->monspecs.dclkmin;
1456 dclkmax = info->monspecs.dclkmax;
1457 }
1458
1459 if (!var->pixclock)
1460 return -EINVAL;
1461 pixclock = PICOS2KHZ(var->pixclock) * 1000;
1462
1463 htotal = var->xres + var->right_margin + var->hsync_len +
1464 var->left_margin;
1465 vtotal = var->yres + var->lower_margin + var->vsync_len +
1466 var->upper_margin;
1467
1468 if (var->vmode & FB_VMODE_INTERLACED)
1469 vtotal /= 2;
1470 if (var->vmode & FB_VMODE_DOUBLE)
1471 vtotal *= 2;
1472
1473 hfreq = pixclock/htotal;
1474 hfreq = (hfreq + 500) / 1000 * 1000;
1475
1476 vfreq = hfreq/vtotal;
1477
1478 return (vfreq < vfmin || vfreq > vfmax ||
1479 hfreq < hfmin || hfreq > hfmax ||
1480 pixclock < dclkmin || pixclock > dclkmax) ?
1481 -EINVAL : 0;
1482 }
1483
1484 #if defined(CONFIG_FIRMWARE_EDID) && defined(CONFIG_X86)
1485
1486 /*
1487 * We need to ensure that the EDID block is only returned for
1488 * the primary graphics adapter.
1489 */
1490
fb_firmware_edid(struct device * device)1491 const unsigned char *fb_firmware_edid(struct device *device)
1492 {
1493 struct pci_dev *dev = NULL;
1494 struct resource *res = NULL;
1495 unsigned char *edid = NULL;
1496
1497 if (device)
1498 dev = to_pci_dev(device);
1499
1500 if (dev)
1501 res = &dev->resource[PCI_ROM_RESOURCE];
1502
1503 if (res && res->flags & IORESOURCE_ROM_SHADOW)
1504 edid = edid_info.dummy;
1505
1506 return edid;
1507 }
1508 #else
fb_firmware_edid(struct device * device)1509 const unsigned char *fb_firmware_edid(struct device *device)
1510 {
1511 return NULL;
1512 }
1513 #endif
1514 EXPORT_SYMBOL(fb_firmware_edid);
1515
1516 EXPORT_SYMBOL(fb_parse_edid);
1517 EXPORT_SYMBOL(fb_edid_to_monspecs);
1518 EXPORT_SYMBOL(fb_get_mode);
1519 EXPORT_SYMBOL(fb_validate_mode);
1520 EXPORT_SYMBOL(fb_destroy_modedb);
1521
