projects / linux-2.6-block.git / blame
? search:
summary | shortlog | log | commit | commitdiff | tree
blob | blame (incremental) | history | HEAD
treewide: kzalloc() -> kcalloc()
[linux-2.6-block.git] / drivers / video / fbdev / core / fbmon.c
CommitLineData
1da177e4
LT		 1/*
2 * linux/drivers/video/fbmon.c
3 *
4 * Copyright (C) 2002 James Simmons <jsimmons@users.sf.net>
5 *
6 * Credits:
8c85fd89 7 *
1da177e4
LT		 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>
8c85fd89
AH		 15 *
16 * 3. John Fremlin <vii@users.sourceforge.net> and
1da177e4 17 * Ani Joshi <ajoshi@unixbox.com>
8c85fd89 18 *
1da177e4
LT		 19 * Generalized Timing Formula is derived from:
20 *
8c85fd89 21 * GTF Spreadsheet by Andy Morrish (1/5/97)
1da177e4
LT		 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 */
1da177e4
LT		 29#include <linux/fb.h>
30#include <linux/module.h>
22f4a00f 31#include <linux/pci.h>
5a0e3ad6 32#include <linux/slab.h>
5e518d76 33#include <video/edid.h>
79089044 34#include <video/of_videomode.h>
2db54c72 35#include <video/videomode.h>
19757fc8 36#include "../edid.h"
1da177e4 37
8c85fd89 38/*
1da177e4
LT		 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...)
48#endif
49
33a9f640
AD		 50#define FBMON_FIX_HEADER 1
51#define FBMON_FIX_INPUT 2
52#define FBMON_FIX_TIMINGS 3
1da177e4
LT		 53
54#ifdef CONFIG_FB_MODE_HELPERS
55struct broken_edid {
56 u8 manufacturer[4];
57 u32 model;
58 u32 fix;
59};
60
d95159cf 61static const struct broken_edid brokendb[] = {
1da177e4
LT		 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 },
33a9f640
AD		 74 /* Sharp UXGA? */
75 {
76 .manufacturer = "SHP",
77 .model = 0x138e,
78 .fix = FBMON_FIX_TIMINGS,
79 },
1da177e4
LT		 80};
81
82static const unsigned char edid_v1_header[] = { 0x00, 0xff, 0xff, 0xff,
83 0xff, 0xff, 0xff, 0x00
84};
85
86static 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
33a9f640
AD		 96static 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
106static 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
116static 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
126static 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
136static 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
1da177e4
LT		 145static 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) {
8c85fd89
AH		 162 fix = brokendb[i].fix;
163 break;
1da177e4
LT		 164 }
165 }
166
167 switch (fix) {
168 case FBMON_FIX_HEADER:
169 for (i = 0; i < 8; i++) {
33a9f640 170 if (edid[i] != edid_v1_header[i]) {
1da177e4 171 ret = fix;
33a9f640
AD		 172 break;
173 }
1da177e4
LT		 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;
33a9f640
AD		 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;
1da177e4
LT		 197 }
198
33a9f640
AD		 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
1da177e4
LT		 204 return ret;
205}
206
207static void fix_edid(unsigned char *edid, int fix)
208{
33a9f640
AD		 209 int i;
210 unsigned char *b, csum = 0;
1da177e4
LT		 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;
33a9f640
AD		 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;
1da177e4
LT		 253 }
254}
255
256static int edid_checksum(unsigned char *edid)
257{
3730793d
LT		 258 unsigned char csum = 0, all_null = 0;
259 int i, err = 0, fix = check_edid(edid);
1da177e4
LT		 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
277static 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
292static 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
310static 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}
8c85fd89 325
1da177e4
LT		 326static 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);
8c85fd89 367
1da177e4
LT		 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
61ab7903
AD		 381static void calc_mode_timings(int xres, int yres, int refresh,
382 struct fb_videomode *mode)
1da177e4 383{
af5d0f7e 384 struct fb_var_screeninfo *var;
8c85fd89 385
af5d0f7e
AD		 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 }
1da177e4
LT		 407}
408
409static 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) {
8c85fd89 453 mode[num++] = vesa_modes[9];
1da177e4
LT		 454 DPRINTK(" 800x600@72Hz\n");
455 }
456 if (c&0x40) {
8c85fd89 457 mode[num++] = vesa_modes[10];
1da177e4
LT		 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
43dcd13b 494static int get_std_timing(unsigned char *block, struct fb_videomode *mode,
72bbf10b 495 int ver, int rev, const struct fb_monspecs *specs)
1da177e4 496{
8f5ee77b 497 int i;
1da177e4 498
8f5ee77b
DU		 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;
1da177e4 503 }
8f5ee77b
DU		 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;
1da177e4 536 }
8f5ee77b
DU		 537 refresh = (block[1] & 0x3f) + 60;
538 DPRINTK(" %dx%d@%dHz\n", xres, yres, refresh);
539
540 calc_mode_timings(xres, yres, refresh, mode);
1da177e4 541 }
8f5ee77b 542
72bbf10b
DU		 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
1da177e4
LT		 550 return 1;
551}
552
72bbf10b
DU		 553static int get_dst_timing(unsigned char *block, struct fb_videomode *mode,
554 int ver, int rev, const struct fb_monspecs *specs)
1da177e4
LT		 555{
556 int j, num = 0;
557
8c85fd89 558 for (j = 0; j < 6; j++, block += STD_TIMING_DESCRIPTION_SIZE)
72bbf10b 559 num += get_std_timing(block, &mode[num], ver, rev, specs);
1da177e4
LT		 560
561 return num;
562}
563
8c85fd89 564static void get_detailed_timing(unsigned char *block,
1da177e4
LT		 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);
8c85fd89 575 mode->upper_margin = V_BLANKING - V_SYNC_OFFSET -
1da177e4
LT		 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));
1a3b09dc
JD		 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 }
1da177e4
LT		 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 *
609 * RETURNS: struct fb_videomode, @dbsize contains length of database
610 *
611 * DESCRIPTION:
612 * This function builds a mode database using the contents of the EDID
613 * data
614 */
72bbf10b
DU		 615static struct fb_videomode *fb_create_modedb(unsigned char *edid, int *dbsize,
616 const struct fb_monspecs *specs)
1da177e4
LT		 617{
618 struct fb_videomode *mode, *m;
619 unsigned char *block;
5a258d03 620 int num = 0, i, first = 1;
43dcd13b
TV		 621 int ver, rev;
622
6396bb22 623 mode = kcalloc(50, sizeof(struct fb_videomode), GFP_KERNEL);
1da177e4
LT		 624 if (mode == NULL)
625 return NULL;
1da177e4 626
8c85fd89 627 if (edid == NULL || !edid_checksum(edid) ||
1da177e4
LT		 628 !edid_check_header(edid)) {
629 kfree(mode);
630 return NULL;
631 }
632
d746b40c
SM		 633 ver = edid[EDID_STRUCT_VERSION];
634 rev = edid[EDID_STRUCT_REVISION];
635
1da177e4
LT		 636 *dbsize = 0;
637
1da177e4
LT		 638 DPRINTK(" Detailed Timings\n");
639 block = edid + DETAILED_TIMING_DESCRIPTIONS_START;
640 for (i = 0; i < 4; i++, block+= DETAILED_TIMING_DESCRIPTION_SIZE) {
14c8102f 641 if (!(block[0] == 0x00 && block[1] == 0x00)) {
1da177e4
LT		 642 get_detailed_timing(block, &mode[num]);
643 if (first) {
644 mode[num].flag |= FB_MODE_IS_FIRST;
645 first = 0;
646 }
647 num++;
648 }
649 }
14c8102f
AD		 650
651 DPRINTK(" Supported VESA Modes\n");
652 block = edid + ESTABLISHED_TIMING_1;
653 num += get_est_timing(block, &mode[num]);
654
655 DPRINTK(" Standard Timings\n");
656 block = edid + STD_TIMING_DESCRIPTIONS_START;
657 for (i = 0; i < STD_TIMING; i++, block += STD_TIMING_DESCRIPTION_SIZE)
72bbf10b 658 num += get_std_timing(block, &mode[num], ver, rev, specs);
14c8102f
AD		 659
660 block = edid + DETAILED_TIMING_DESCRIPTIONS_START;
661 for (i = 0; i < 4; i++, block+= DETAILED_TIMING_DESCRIPTION_SIZE) {
662 if (block[0] == 0x00 && block[1] == 0x00 && block[3] == 0xfa)
72bbf10b
DU		 663 num += get_dst_timing(block + 5, &mode[num],
664 ver, rev, specs);
14c8102f 665 }
8c85fd89 666
1da177e4
LT		 667 /* Yikes, EDID data is totally useless */
668 if (!num) {
669 kfree(mode);
670 return NULL;
671 }
672
673 *dbsize = num;
6da2ec56 674 m = kmalloc_array(num, sizeof(struct fb_videomode), GFP_KERNEL);
1da177e4
LT		 675 if (!m)
676 return mode;
677 memmove(m, mode, num * sizeof(struct fb_videomode));
678 kfree(mode);
679 return m;
680}
681
682/**
683 * fb_destroy_modedb - destroys mode database
684 * @modedb: mode database to destroy
685 *
686 * DESCRIPTION:
687 * Destroy mode database created by fb_create_modedb
688 */
689void fb_destroy_modedb(struct fb_videomode *modedb)
690{
691 kfree(modedb);
692}
693
694static int fb_get_monitor_limits(unsigned char *edid, struct fb_monspecs *specs)
695{
696 int i, retval = 1;
697 unsigned char *block;
698
699 block = edid + DETAILED_TIMING_DESCRIPTIONS_START;
700
701 DPRINTK(" Monitor Operating Limits: ");
30076831 702
1da177e4
LT		 703 for (i = 0; i < 4; i++, block += DETAILED_TIMING_DESCRIPTION_SIZE) {
704 if (edid_is_limits_block(block)) {
705 specs->hfmin = H_MIN_RATE * 1000;
706 specs->hfmax = H_MAX_RATE * 1000;
707 specs->vfmin = V_MIN_RATE;
708 specs->vfmax = V_MAX_RATE;
709 specs->dclkmax = MAX_PIXEL_CLOCK * 1000000;
710 specs->gtf = (GTF_SUPPORT) ? 1 : 0;
711 retval = 0;
712 DPRINTK("From EDID\n");
713 break;
714 }
715 }
30076831 716
1da177e4
LT		 717 /* estimate monitor limits based on modes supported */
718 if (retval) {
30076831 719 struct fb_videomode *modes, *mode;
cb85063a 720 int num_modes, hz, hscan, pixclock;
30076831 721 int vtotal, htotal;
1da177e4 722
72bbf10b 723 modes = fb_create_modedb(edid, &num_modes, specs);
1da177e4
LT		 724 if (!modes) {
725 DPRINTK("None Available\n");
726 return 1;
727 }
728
729 retval = 0;
730 for (i = 0; i < num_modes; i++) {
30076831 731 mode = &modes[i];
1da177e4 732 pixclock = PICOS2KHZ(modes[i].pixclock) * 1000;
30076831
AD		 733 htotal = mode->xres + mode->right_margin + mode->hsync_len
734 + mode->left_margin;
735 vtotal = mode->yres + mode->lower_margin + mode->vsync_len
736 + mode->upper_margin;
737
738 if (mode->vmode & FB_VMODE_INTERLACED)
739 vtotal /= 2;
740
741 if (mode->vmode & FB_VMODE_DOUBLE)
742 vtotal *= 2;
743
744 hscan = (pixclock + htotal / 2) / htotal;
745 hscan = (hscan + 500) / 1000 * 1000;
746 hz = (hscan + vtotal / 2) / vtotal;
8c85fd89 747
1da177e4
LT		 748 if (specs->dclkmax == 0 || specs->dclkmax < pixclock)
749 specs->dclkmax = pixclock;
30076831 750
1da177e4
LT		 751 if (specs->dclkmin == 0 || specs->dclkmin > pixclock)
752 specs->dclkmin = pixclock;
30076831 753
1da177e4
LT		 754 if (specs->hfmax == 0 || specs->hfmax < hscan)
755 specs->hfmax = hscan;
30076831 756
1da177e4
LT		 757 if (specs->hfmin == 0 || specs->hfmin > hscan)
758 specs->hfmin = hscan;
30076831 759
1da177e4
LT		 760 if (specs->vfmax == 0 || specs->vfmax < hz)
761 specs->vfmax = hz;
30076831 762
1da177e4
LT		 763 if (specs->vfmin == 0 || specs->vfmin > hz)
764 specs->vfmin = hz;
765 }
766 DPRINTK("Extrapolated\n");
767 fb_destroy_modedb(modes);
768 }
769 DPRINTK(" H: %d-%dKHz V: %d-%dHz DCLK: %dMHz\n",
770 specs->hfmin/1000, specs->hfmax/1000, specs->vfmin,
771 specs->vfmax, specs->dclkmax/1000000);
772 return retval;
773}
774
775static void get_monspecs(unsigned char *edid, struct fb_monspecs *specs)
776{
777 unsigned char c, *block;
778
779 block = edid + EDID_STRUCT_DISPLAY;
780
781 fb_get_monitor_limits(edid, specs);
782
783 c = block[0] & 0x80;
784 specs->input = 0;
785 if (c) {
786 specs->input |= FB_DISP_DDI;
787 DPRINTK(" Digital Display Input");
788 } else {
789 DPRINTK(" Analog Display Input: Input Voltage - ");
790 switch ((block[0] & 0x60) >> 5) {
791 case 0:
792 DPRINTK("0.700V/0.300V");
793 specs->input |= FB_DISP_ANA_700_300;
794 break;
795 case 1:
796 DPRINTK("0.714V/0.286V");
797 specs->input |= FB_DISP_ANA_714_286;
798 break;
799 case 2:
800 DPRINTK("1.000V/0.400V");
801 specs->input |= FB_DISP_ANA_1000_400;
802 break;
803 case 3:
804 DPRINTK("0.700V/0.000V");
805 specs->input |= FB_DISP_ANA_700_000;
806 break;
807 }
808 }
809 DPRINTK("\n Sync: ");
810 c = block[0] & 0x10;
811 if (c)
812 DPRINTK(" Configurable signal level\n");
813 c = block[0] & 0x0f;
814 specs->signal = 0;
815 if (c & 0x10) {
816 DPRINTK("Blank to Blank ");
817 specs->signal |= FB_SIGNAL_BLANK_BLANK;
818 }
819 if (c & 0x08) {
820 DPRINTK("Separate ");
821 specs->signal |= FB_SIGNAL_SEPARATE;
822 }
823 if (c & 0x04) {
824 DPRINTK("Composite ");
825 specs->signal |= FB_SIGNAL_COMPOSITE;
826 }
827 if (c & 0x02) {
828 DPRINTK("Sync on Green ");
829 specs->signal |= FB_SIGNAL_SYNC_ON_GREEN;
830 }
831 if (c & 0x01) {
832 DPRINTK("Serration on ");
833 specs->signal |= FB_SIGNAL_SERRATION_ON;
834 }
835 DPRINTK("\n");
836 specs->max_x = block[1];
837 specs->max_y = block[2];
838 DPRINTK(" Max H-size in cm: ");
839 if (specs->max_x)
840 DPRINTK("%d\n", specs->max_x);
841 else
842 DPRINTK("variable\n");
843 DPRINTK(" Max V-size in cm: ");
844 if (specs->max_y)
845 DPRINTK("%d\n", specs->max_y);
846 else
847 DPRINTK("variable\n");
848
849 c = block[3];
850 specs->gamma = c+100;
851 DPRINTK(" Gamma: ");
852 DPRINTK("%d.%d\n", specs->gamma/100, specs->gamma % 100);
853
854 get_dpms_capabilities(block[4], specs);
855
856 switch ((block[4] & 0x18) >> 3) {
857 case 0:
858 DPRINTK(" Monochrome/Grayscale\n");
859 specs->input |= FB_DISP_MONO;
860 break;
861 case 1:
862 DPRINTK(" RGB Color Display\n");
863 specs->input |= FB_DISP_RGB;
864 break;
865 case 2:
866 DPRINTK(" Non-RGB Multicolor Display\n");
867 specs->input |= FB_DISP_MULTI;
868 break;
869 default:
870 DPRINTK(" Unknown\n");
871 specs->input |= FB_DISP_UNKNOWN;
872 break;
873 }
874
875 get_chroma(block, specs);
876
877 specs->misc = 0;
878 c = block[4] & 0x7;
879 if (c & 0x04) {
880 DPRINTK(" Default color format is primary\n");
881 specs->misc |= FB_MISC_PRIM_COLOR;
882 }
883 if (c & 0x02) {
884 DPRINTK(" First DETAILED Timing is preferred\n");
885 specs->misc |= FB_MISC_1ST_DETAIL;
886 }
887 if (c & 0x01) {
888 printk(" Display is GTF capable\n");
889 specs->gtf = 1;
890 }
891}
892
1da177e4
LT		 893int fb_parse_edid(unsigned char *edid, struct fb_var_screeninfo *var)
894{
895 int i;
896 unsigned char *block;
897
898 if (edid == NULL || var == NULL)
899 return 1;
900
901 if (!(edid_checksum(edid)))
902 return 1;
903
904 if (!(edid_check_header(edid)))
905 return 1;
906
907 block = edid + DETAILED_TIMING_DESCRIPTIONS_START;
908
909 for (i = 0; i < 4; i++, block += DETAILED_TIMING_DESCRIPTION_SIZE) {
910 if (edid_is_timing_block(block)) {
911 var->xres = var->xres_virtual = H_ACTIVE;
912 var->yres = var->yres_virtual = V_ACTIVE;
43a3abc6 913 var->height = var->width = 0;
1da177e4
LT		 914 var->right_margin = H_SYNC_OFFSET;
915 var->left_margin = (H_ACTIVE + H_BLANKING) -
916 (H_ACTIVE + H_SYNC_OFFSET + H_SYNC_WIDTH);
917 var->upper_margin = V_BLANKING - V_SYNC_OFFSET -
918 V_SYNC_WIDTH;
919 var->lower_margin = V_SYNC_OFFSET;
920 var->hsync_len = H_SYNC_WIDTH;
921 var->vsync_len = V_SYNC_WIDTH;
922 var->pixclock = PIXEL_CLOCK;
923 var->pixclock /= 1000;
924 var->pixclock = KHZ2PICOS(var->pixclock);
925
926 if (HSYNC_POSITIVE)
927 var->sync |= FB_SYNC_HOR_HIGH_ACT;
928 if (VSYNC_POSITIVE)
929 var->sync |= FB_SYNC_VERT_HIGH_ACT;
930 return 0;
931 }
932 }
933 return 1;
934}
935
936void fb_edid_to_monspecs(unsigned char *edid, struct fb_monspecs *specs)
937{
938 unsigned char *block;
475666d4 939 int i, found = 0;
1da177e4
LT		 940
941 if (edid == NULL)
942 return;
943
944 if (!(edid_checksum(edid)))
945 return;
946
947 if (!(edid_check_header(edid)))
948 return;
949
950 memset(specs, 0, sizeof(struct fb_monspecs));
951
952 specs->version = edid[EDID_STRUCT_VERSION];
953 specs->revision = edid[EDID_STRUCT_REVISION];
954
955 DPRINTK("========================================\n");
956 DPRINTK("Display Information (EDID)\n");
957 DPRINTK("========================================\n");
958 DPRINTK(" EDID Version %d.%d\n", (int) specs->version,
959 (int) specs->revision);
960
961 parse_vendor_block(edid + ID_MANUFACTURER_NAME, specs);
962
963 block = edid + DETAILED_TIMING_DESCRIPTIONS_START;
964 for (i = 0; i < 4; i++, block += DETAILED_TIMING_DESCRIPTION_SIZE) {
965 if (edid_is_serial_block(block)) {
966 copy_string(block, specs->serial_no);
967 DPRINTK(" Serial Number: %s\n", specs->serial_no);
968 } else if (edid_is_ascii_block(block)) {
969 copy_string(block, specs->ascii);
970 DPRINTK(" ASCII Block: %s\n", specs->ascii);
971 } else if (edid_is_monitor_block(block)) {
972 copy_string(block, specs->monitor);
973 DPRINTK(" Monitor Name: %s\n", specs->monitor);
974 }
975 }
976
977 DPRINTK(" Display Characteristics:\n");
978 get_monspecs(edid, specs);
979
72bbf10b 980 specs->modedb = fb_create_modedb(edid, &specs->modedb_len, specs);
475666d4
AD		 981
982 /*
983 * Workaround for buggy EDIDs that sets that the first
984 * detailed timing is preferred but has not detailed
985 * timing specified
986 */
987 for (i = 0; i < specs->modedb_len; i++) {
988 if (specs->modedb[i].flag & FB_MODE_IS_DETAILED) {
989 found = 1;
990 break;
991 }
992 }
993
994 if (!found)
995 specs->misc &= ~FB_MISC_1ST_DETAIL;
996
1da177e4
LT		 997 DPRINTK("========================================\n");
998}
999
e4105119
GL		 1000/**
1001 * fb_edid_add_monspecs() - add monitor video modes from E-EDID data
1002 * @edid: 128 byte array with an E-EDID block
1003 * @spacs: monitor specs to be extended
1004 */
9fbbdde9
EG		 1005void fb_edid_add_monspecs(unsigned char *edid, struct fb_monspecs *specs)
1006{
1007 unsigned char *block;
e4105119
GL		 1008 struct fb_videomode *m;
1009 int num = 0, i;
0ad83f68
GL		 1010 u8 svd[64], edt[(128 - 4) / DETAILED_TIMING_DESCRIPTION_SIZE];
1011 u8 pos = 4, svd_n = 0;
9fbbdde9 1012
e4105119 1013 if (!edid)
9fbbdde9
EG		 1014 return;
1015
1016 if (!edid_checksum(edid))
1017 return;
1018
e4105119
GL		 1019 if (edid[0] != 0x2 ||
1020 edid[2] < 4 || edid[2] > 128 - DETAILED_TIMING_DESCRIPTION_SIZE)
9fbbdde9
EG		 1021 return;
1022
0ad83f68
GL		 1023 DPRINTK(" Short Video Descriptors\n");
1024
1025 while (pos < edid[2]) {
1026 u8 len = edid[pos] & 0x1f, type = (edid[pos] >> 5) & 7;
1027 pr_debug("Data block %u of %u bytes\n", type, len);
e6853aaf 1028 if (type == 2) {
0ad83f68
GL		 1029 for (i = pos; i < pos + len; i++) {
1030 u8 idx = edid[pos + i] & 0x7f;
1031 svd[svd_n++] = idx;
1032 pr_debug("N%sative mode #%d\n",
1033 edid[pos + i] & 0x80 ? "" : "on-n", idx);
1034 }
e6853aaf
DU		 1035 } else if (type == 3 && len >= 3) {
1036 /* Check Vendor Specific Data Block. For HDMI,
1037 it is always 00-0C-03 for HDMI Licensing, LLC. */
1038 if (edid[pos + 1] == 3 && edid[pos + 2] == 0xc &&
1039 edid[pos + 3] == 0)
1040 specs->misc |= FB_MISC_HDMI;
1041 }
0ad83f68
GL		 1042 pos += len + 1;
1043 }
1044
e4105119 1045 block = edid + edid[2];
9fbbdde9
EG		 1046
1047 DPRINTK(" Extended Detailed Timings\n");
1048
e4105119
GL		 1049 for (i = 0; i < (128 - edid[2]) / DETAILED_TIMING_DESCRIPTION_SIZE;
1050 i++, block += DETAILED_TIMING_DESCRIPTION_SIZE)
c544ad18 1051 if (PIXEL_CLOCK != 0)
e4105119 1052 edt[num++] = block - edid;
9fbbdde9
EG		 1053
1054 /* Yikes, EDID data is totally useless */
0ad83f68 1055 if (!(num + svd_n))
9fbbdde9 1056 return;
9fbbdde9 1057
6396bb22
KC		 1058 m = kcalloc(specs->modedb_len + num + svd_n,
1059 sizeof(struct fb_videomode),
1060 GFP_KERNEL);
9fbbdde9 1061
e4105119 1062 if (!m)
9fbbdde9 1063 return;
e4105119
GL		 1064
1065 memcpy(m, specs->modedb, specs->modedb_len * sizeof(struct fb_videomode));
1066
1067 for (i = specs->modedb_len; i < specs->modedb_len + num; i++) {
1068 get_detailed_timing(edid + edt[i - specs->modedb_len], &m[i]);
1069 if (i == specs->modedb_len)
1070 m[i].flag |= FB_MODE_IS_FIRST;
1071 pr_debug("Adding %ux%u@%u\n", m[i].xres, m[i].yres, m[i].refresh);
9fbbdde9
EG		 1072 }
1073
0ad83f68
GL		 1074 for (i = specs->modedb_len + num; i < specs->modedb_len + num + svd_n; i++) {
1075 int idx = svd[i - specs->modedb_len - num];
6080a893 1076 if (!idx || idx >= ARRAY_SIZE(cea_modes)) {
6f9655b1 1077 pr_warn("Reserved SVD code %d\n", idx);
6080a893 1078 } else if (!cea_modes[idx].xres) {
6f9655b1 1079 pr_warn("Unimplemented SVD code %d\n", idx);
0ad83f68
GL		 1080 } else {
1081 memcpy(&m[i], cea_modes + idx, sizeof(m[i]));
1082 pr_debug("Adding SVD #%d: %ux%u@%u\n", idx,
1083 m[i].xres, m[i].yres, m[i].refresh);
1084 }
1085 }
1086
9fbbdde9
EG		 1087 kfree(specs->modedb);
1088 specs->modedb = m;
0ad83f68 1089 specs->modedb_len = specs->modedb_len + num + svd_n;
9fbbdde9
EG		 1090}
1091
8c85fd89
AH		 1092/*
1093 * VESA Generalized Timing Formula (GTF)
1da177e4
LT		 1094 */
1095
1096#define FLYBACK 550
1097#define V_FRONTPORCH 1
1098#define H_OFFSET 40
1099#define H_SCALEFACTOR 20
1100#define H_BLANKSCALE 128
1101#define H_GRADIENT 600
1102#define C_VAL 30
1103#define M_VAL 300
1104
1105struct __fb_timings {
1106 u32 dclk;
1107 u32 hfreq;
1108 u32 vfreq;
1109 u32 hactive;
1110 u32 vactive;
1111 u32 hblank;
1112 u32 vblank;
1113 u32 htotal;
1114 u32 vtotal;
1115};
1116
1117/**
1118 * fb_get_vblank - get vertical blank time
1119 * @hfreq: horizontal freq
1120 *
1121 * DESCRIPTION:
8c85fd89 1122 * vblank = right_margin + vsync_len + left_margin
1da177e4
LT		 1123 *
1124 * given: right_margin = 1 (V_FRONTPORCH)
1125 * vsync_len = 3
1126 * flyback = 550
1127 *
1128 * flyback * hfreq
1129 * left_margin = --------------- - vsync_len
1130 * 1000000
1131 */
1132static u32 fb_get_vblank(u32 hfreq)
1133{
1134 u32 vblank;
1135
8c85fd89 1136 vblank = (hfreq * FLYBACK)/1000;
1da177e4
LT		 1137 vblank = (vblank + 500)/1000;
1138 return (vblank + V_FRONTPORCH);
1139}
1140
8c85fd89 1141/**
1da177e4
LT		 1142 * fb_get_hblank_by_freq - get horizontal blank time given hfreq
1143 * @hfreq: horizontal freq
1144 * @xres: horizontal resolution in pixels
1145 *
1146 * DESCRIPTION:
1147 *
1148 * xres * duty_cycle
1149 * hblank = ------------------
1150 * 100 - duty_cycle
1151 *
1152 * duty cycle = percent of htotal assigned to inactive display
1153 * duty cycle = C - (M/Hfreq)
1154 *
1155 * where: C = ((offset - scale factor) * blank_scale)
1156 * -------------------------------------- + scale factor
8c85fd89 1157 * 256
1da177e4
LT		 1158 * M = blank_scale * gradient
1159 *
1160 */
1161static u32 fb_get_hblank_by_hfreq(u32 hfreq, u32 xres)
1162{
1163 u32 c_val, m_val, duty_cycle, hblank;
1164
8c85fd89 1165 c_val = (((H_OFFSET - H_SCALEFACTOR) * H_BLANKSCALE)/256 +
1da177e4
LT		 1166 H_SCALEFACTOR) * 1000;
1167 m_val = (H_BLANKSCALE * H_GRADIENT)/256;
1168 m_val = (m_val * 1000000)/hfreq;
1169 duty_cycle = c_val - m_val;
1170 hblank = (xres * duty_cycle)/(100000 - duty_cycle);
1171 return (hblank);
1172}
1173
8c85fd89 1174/**
1da177e4
LT		 1175 * fb_get_hblank_by_dclk - get horizontal blank time given pixelclock
1176 * @dclk: pixelclock in Hz
1177 * @xres: horizontal resolution in pixels
1178 *
1179 * DESCRIPTION:
1180 *
1181 * xres * duty_cycle
1182 * hblank = ------------------
1183 * 100 - duty_cycle
1184 *
1185 * duty cycle = percent of htotal assigned to inactive display
1186 * duty cycle = C - (M * h_period)
8c85fd89 1187 *
1da177e4
LT		 1188 * where: h_period = SQRT(100 - C + (0.4 * xres * M)/dclk) + C - 100
1189 * -----------------------------------------------
1190 * 2 * M
1191 * M = 300;
1192 * C = 30;
1193
1194 */
1195static u32 fb_get_hblank_by_dclk(u32 dclk, u32 xres)
1196{
1197 u32 duty_cycle, h_period, hblank;
1198
1199 dclk /= 1000;
1200 h_period = 100 - C_VAL;
1201 h_period *= h_period;
1202 h_period += (M_VAL * xres * 2 * 1000)/(5 * dclk);
8c85fd89 1203 h_period *= 10000;
1da177e4
LT		 1204
1205 h_period = int_sqrt(h_period);
1206 h_period -= (100 - C_VAL) * 100;
8c85fd89 1207 h_period *= 1000;
1da177e4
LT		 1208 h_period /= 2 * M_VAL;
1209
1210 duty_cycle = C_VAL * 1000 - (M_VAL * h_period)/100;
1211 hblank = (xres * duty_cycle)/(100000 - duty_cycle) + 8;
1212 hblank &= ~15;
1213 return (hblank);
1214}
8c85fd89 1215
1da177e4
LT		 1216/**
1217 * fb_get_hfreq - estimate hsync
1218 * @vfreq: vertical refresh rate
1219 * @yres: vertical resolution
1220 *
1221 * DESCRIPTION:
1222 *
1223 * (yres + front_port) * vfreq * 1000000
1224 * hfreq = -------------------------------------
1225 * (1000000 - (vfreq * FLYBACK)
8c85fd89 1226 *
1da177e4
LT		 1227 */
1228
1229static u32 fb_get_hfreq(u32 vfreq, u32 yres)
1230{
1231 u32 divisor, hfreq;
8c85fd89 1232
1da177e4
LT		 1233 divisor = (1000000 - (vfreq * FLYBACK))/1000;
1234 hfreq = (yres + V_FRONTPORCH) * vfreq * 1000;
1235 return (hfreq/divisor);
1236}
1237
1238static void fb_timings_vfreq(struct __fb_timings *timings)
1239{
1240 timings->hfreq = fb_get_hfreq(timings->vfreq, timings->vactive);
1241 timings->vblank = fb_get_vblank(timings->hfreq);
1242 timings->vtotal = timings->vactive + timings->vblank;
8c85fd89 1243 timings->hblank = fb_get_hblank_by_hfreq(timings->hfreq,
1da177e4
LT		 1244 timings->hactive);
1245 timings->htotal = timings->hactive + timings->hblank;
1246 timings->dclk = timings->htotal * timings->hfreq;
1247}
1248
1249static void fb_timings_hfreq(struct __fb_timings *timings)
1250{
1251 timings->vblank = fb_get_vblank(timings->hfreq);
1252 timings->vtotal = timings->vactive + timings->vblank;
1253 timings->vfreq = timings->hfreq/timings->vtotal;
8c85fd89 1254 timings->hblank = fb_get_hblank_by_hfreq(timings->hfreq,
1da177e4
LT		 1255 timings->hactive);
1256 timings->htotal = timings->hactive + timings->hblank;
1257 timings->dclk = timings->htotal * timings->hfreq;
1258}
1259
1260static void fb_timings_dclk(struct __fb_timings *timings)
1261{
8c85fd89 1262 timings->hblank = fb_get_hblank_by_dclk(timings->dclk,
1da177e4
LT		 1263 timings->hactive);
1264 timings->htotal = timings->hactive + timings->hblank;
1265 timings->hfreq = timings->dclk/timings->htotal;
1266 timings->vblank = fb_get_vblank(timings->hfreq);
1267 timings->vtotal = timings->vactive + timings->vblank;
1268 timings->vfreq = timings->hfreq/timings->vtotal;
1269}
1270
1271/*
1272 * fb_get_mode - calculates video mode using VESA GTF
1273 * @flags: if: 0 - maximize vertical refresh rate
1274 * 1 - vrefresh-driven calculation;
1275 * 2 - hscan-driven calculation;
1276 * 3 - pixelclock-driven calculation;
1277 * @val: depending on @flags, ignored, vrefresh, hsync or pixelclock
1278 * @var: pointer to fb_var_screeninfo
1279 * @info: pointer to fb_info
1280 *
1281 * DESCRIPTION:
8c85fd89
AH		 1282 * Calculates video mode based on monitor specs using VESA GTF.
1283 * The GTF is best for VESA GTF compliant monitors but is
1da177e4
LT		 1284 * specifically formulated to work for older monitors as well.
1285 *
8c85fd89 1286 * If @flag==0, the function will attempt to maximize the
1da177e4 1287 * refresh rate. Otherwise, it will calculate timings based on
8c85fd89 1288 * the flag and accompanying value.
1da177e4 1289 *
8c85fd89 1290 * If FB_IGNOREMON bit is set in @flags, monitor specs will be
1da177e4
LT		 1291 * ignored and @var will be filled with the calculated timings.
1292 *
1293 * All calculations are based on the VESA GTF Spreadsheet
1294 * available at VESA's public ftp (http://www.vesa.org).
8c85fd89 1295 *
1da177e4
LT		 1296 * NOTES:
1297 * The timings generated by the GTF will be different from VESA
1298 * DMT. It might be a good idea to keep a table of standard
1299 * VESA modes as well. The GTF may also not work for some displays,
1300 * such as, and especially, analog TV.
8c85fd89 1301 *
1da177e4
LT		 1302 * REQUIRES:
1303 * A valid info->monspecs, otherwise 'safe numbers' will be used.
8c85fd89 1304 */
1da177e4
LT		 1305int fb_get_mode(int flags, u32 val, struct fb_var_screeninfo *var, struct fb_info *info)
1306{
af5d0f7e 1307 struct __fb_timings *timings;
1da177e4 1308 u32 interlace = 1, dscan = 1;
af5d0f7e
AD		 1309 u32 hfmin, hfmax, vfmin, vfmax, dclkmin, dclkmax, err = 0;
1310
1311
1312 timings = kzalloc(sizeof(struct __fb_timings), GFP_KERNEL);
1313
1314 if (!timings)
1315 return -ENOMEM;
1da177e4 1316
8c85fd89 1317 /*
1da177e4
LT		 1318 * If monspecs are invalid, use values that are enough
1319 * for 640x480@60
1320 */
af5d0f7e 1321 if (!info || !info->monspecs.hfmax || !info->monspecs.vfmax ||
1da177e4
LT		 1322 !info->monspecs.dclkmax ||
1323 info->monspecs.hfmax < info->monspecs.hfmin ||
1324 info->monspecs.vfmax < info->monspecs.vfmin ||
1325 info->monspecs.dclkmax < info->monspecs.dclkmin) {
1326 hfmin = 29000; hfmax = 30000;
1327 vfmin = 60; vfmax = 60;
1328 dclkmin = 0; dclkmax = 25000000;
1329 } else {
1330 hfmin = info->monspecs.hfmin;
1331 hfmax = info->monspecs.hfmax;
1332 vfmin = info->monspecs.vfmin;
1333 vfmax = info->monspecs.vfmax;
1334 dclkmin = info->monspecs.dclkmin;
1335 dclkmax = info->monspecs.dclkmax;
1336 }
1337
af5d0f7e
AD		 1338 timings->hactive = var->xres;
1339 timings->vactive = var->yres;
8c85fd89 1340 if (var->vmode & FB_VMODE_INTERLACED) {
af5d0f7e 1341 timings->vactive /= 2;
1da177e4
LT		 1342 interlace = 2;
1343 }
1344 if (var->vmode & FB_VMODE_DOUBLE) {
af5d0f7e 1345 timings->vactive *= 2;
1da177e4
LT		 1346 dscan = 2;
1347 }
1348
1349 switch (flags & ~FB_IGNOREMON) {
1350 case FB_MAXTIMINGS: /* maximize refresh rate */
af5d0f7e
AD		 1351 timings->hfreq = hfmax;
1352 fb_timings_hfreq(timings);
1353 if (timings->vfreq > vfmax) {
1354 timings->vfreq = vfmax;
1355 fb_timings_vfreq(timings);
1da177e4 1356 }
af5d0f7e
AD		 1357 if (timings->dclk > dclkmax) {
1358 timings->dclk = dclkmax;
1359 fb_timings_dclk(timings);
1da177e4
LT		 1360 }
1361 break;
1362 case FB_VSYNCTIMINGS: /* vrefresh driven */
af5d0f7e
AD		 1363 timings->vfreq = val;
1364 fb_timings_vfreq(timings);
1da177e4
LT		 1365 break;
1366 case FB_HSYNCTIMINGS: /* hsync driven */
af5d0f7e
AD		 1367 timings->hfreq = val;
1368 fb_timings_hfreq(timings);
1da177e4
LT		 1369 break;
1370 case FB_DCLKTIMINGS: /* pixelclock driven */
af5d0f7e
AD		 1371 timings->dclk = PICOS2KHZ(val) * 1000;
1372 fb_timings_dclk(timings);
1da177e4
LT		 1373 break;
1374 default:
af5d0f7e 1375 err = -EINVAL;
8c85fd89
AH		 1376
1377 }
1378
af5d0f7e
AD		 1379 if (err || (!(flags & FB_IGNOREMON) &&
1380 (timings->vfreq < vfmin || timings->vfreq > vfmax ||
1381 timings->hfreq < hfmin || timings->hfreq > hfmax ||
1382 timings->dclk < dclkmin || timings->dclk > dclkmax))) {
1383 err = -EINVAL;
1384 } else {
1385 var->pixclock = KHZ2PICOS(timings->dclk/1000);
1386 var->hsync_len = (timings->htotal * 8)/100;
1387 var->right_margin = (timings->hblank/2) - var->hsync_len;
1388 var->left_margin = timings->hblank - var->right_margin -
1389 var->hsync_len;
1390 var->vsync_len = (3 * interlace)/dscan;
1391 var->lower_margin = (1 * interlace)/dscan;
1392 var->upper_margin = (timings->vblank * interlace)/dscan -
1393 (var->vsync_len + var->lower_margin);
1394 }
8c85fd89 1395
af5d0f7e
AD		 1396 kfree(timings);
1397 return err;
1da177e4 1398}
2db54c72 1399
a38884f6 1400#ifdef CONFIG_VIDEOMODE_HELPERS
2db54c72
ST		 1401int fb_videomode_from_videomode(const struct videomode *vm,
1402 struct fb_videomode *fbmode)
1403{
1404 unsigned int htotal, vtotal;
1405
1406 fbmode->xres = vm->hactive;
1407 fbmode->left_margin = vm->hback_porch;
1408 fbmode->right_margin = vm->hfront_porch;
1409 fbmode->hsync_len = vm->hsync_len;
1410
1411 fbmode->yres = vm->vactive;
1412 fbmode->upper_margin = vm->vback_porch;
1413 fbmode->lower_margin = vm->vfront_porch;
1414 fbmode->vsync_len = vm->vsync_len;
1415
1416 /* prevent division by zero in KHZ2PICOS macro */
1417 fbmode->pixclock = vm->pixelclock ?
1418 KHZ2PICOS(vm->pixelclock / 1000) : 0;
1419
1420 fbmode->sync = 0;
1421 fbmode->vmode = 0;
06a33079 1422 if (vm->flags & DISPLAY_FLAGS_HSYNC_HIGH)
2db54c72 1423 fbmode->sync |= FB_SYNC_HOR_HIGH_ACT;
9bf9d47a 1424 if (vm->flags & DISPLAY_FLAGS_VSYNC_HIGH)
2db54c72 1425 fbmode->sync |= FB_SYNC_VERT_HIGH_ACT;
06a33079 1426 if (vm->flags & DISPLAY_FLAGS_INTERLACED)
2db54c72 1427 fbmode->vmode |= FB_VMODE_INTERLACED;
06a33079 1428 if (vm->flags & DISPLAY_FLAGS_DOUBLESCAN)
2db54c72
ST		 1429 fbmode->vmode |= FB_VMODE_DOUBLE;
1430 fbmode->flag = 0;
1431
1432 htotal = vm->hactive + vm->hfront_porch + vm->hback_porch +
1433 vm->hsync_len;
1434 vtotal = vm->vactive + vm->vfront_porch + vm->vback_porch +
1435 vm->vsync_len;
1436 /* prevent division by zero */
1437 if (htotal && vtotal) {
1438 fbmode->refresh = vm->pixelclock / (htotal * vtotal);
1439 /* a mode must have htotal and vtotal != 0 or it is invalid */
1440 } else {
1441 fbmode->refresh = 0;
1442 return -EINVAL;
1443 }
1444
1445 return 0;
1446}
1447EXPORT_SYMBOL_GPL(fb_videomode_from_videomode);
2db54c72 1448
a38884f6 1449#ifdef CONFIG_OF
79089044
ST		 1450static inline void dump_fb_videomode(const struct fb_videomode *m)
1451{
1452 pr_debug("fb_videomode = %ux%u@%uHz (%ukHz) %u %u %u %u %u %u %u %u %u\n",
1453 m->xres, m->yres, m->refresh, m->pixclock, m->left_margin,
1454 m->right_margin, m->upper_margin, m->lower_margin,
1455 m->hsync_len, m->vsync_len, m->sync, m->vmode, m->flag);
1456}
1457
1458/**
1459 * of_get_fb_videomode - get a fb_videomode from devicetree
1460 * @np: device_node with the timing specification
1461 * @fb: will be set to the return value
1462 * @index: index into the list of display timings in devicetree
1463 *
1464 * DESCRIPTION:
1465 * This function is expensive and should only be used, if only one mode is to be
1466 * read from DT. To get multiple modes start with of_get_display_timings ond
1467 * work with that instead.
1468 */
1469int of_get_fb_videomode(struct device_node *np, struct fb_videomode *fb,
1470 int index)
1471{
1472 struct videomode vm;
1473 int ret;
1474
1475 ret = of_get_videomode(np, &vm, index);
1476 if (ret)
1477 return ret;
1478
9f5ddefd
VM		 1479 ret = fb_videomode_from_videomode(&vm, fb);
1480 if (ret)
1481 return ret;
79089044 1482
6d7e6533
RH		 1483 pr_debug("%pOF: got %dx%d display mode from %s\n",
1484 np, vm.hactive, vm.vactive, np->name);
79089044
ST		 1485 dump_fb_videomode(fb);
1486
1487 return 0;
1488}
1489EXPORT_SYMBOL_GPL(of_get_fb_videomode);
a38884f6
TV		 1490#endif /* CONFIG_OF */
1491#endif /* CONFIG_VIDEOMODE_HELPERS */
79089044 1492
1da177e4
LT		 1493#else
1494int fb_parse_edid(unsigned char *edid, struct fb_var_screeninfo *var)
1495{
1496 return 1;
1497}
1498void fb_edid_to_monspecs(unsigned char *edid, struct fb_monspecs *specs)
1499{
1da177e4 1500}
e4105119
GL		 1501void fb_edid_add_monspecs(unsigned char *edid, struct fb_monspecs *specs)
1502{
1503}
1da177e4
LT		 1504void fb_destroy_modedb(struct fb_videomode *modedb)
1505{
1506}
1507int fb_get_mode(int flags, u32 val, struct fb_var_screeninfo *var,
1508 struct fb_info *info)
1509{
1510 return -EINVAL;
1511}
1512#endif /* CONFIG_FB_MODE_HELPERS */
8c85fd89 1513
1da177e4
LT		 1514/*
1515 * fb_validate_mode - validates var against monitor capabilities
1516 * @var: pointer to fb_var_screeninfo
1517 * @info: pointer to fb_info
1518 *
1519 * DESCRIPTION:
1520 * Validates video mode against monitor capabilities specified in
1521 * info->monspecs.
1522 *
1523 * REQUIRES:
1524 * A valid info->monspecs.
1525 */
1526int fb_validate_mode(const struct fb_var_screeninfo *var, struct fb_info *info)
1527{
1528 u32 hfreq, vfreq, htotal, vtotal, pixclock;
1529 u32 hfmin, hfmax, vfmin, vfmax, dclkmin, dclkmax;
1530
8c85fd89 1531 /*
1da177e4
LT		 1532 * If monspecs are invalid, use values that are enough
1533 * for 640x480@60
1534 */
1535 if (!info->monspecs.hfmax || !info->monspecs.vfmax ||
1536 !info->monspecs.dclkmax ||
1537 info->monspecs.hfmax < info->monspecs.hfmin ||
1538 info->monspecs.vfmax < info->monspecs.vfmin ||
1539 info->monspecs.dclkmax < info->monspecs.dclkmin) {
1540 hfmin = 29000; hfmax = 30000;
1541 vfmin = 60; vfmax = 60;
1542 dclkmin = 0; dclkmax = 25000000;
1543 } else {
1544 hfmin = info->monspecs.hfmin;
1545 hfmax = info->monspecs.hfmax;
1546 vfmin = info->monspecs.vfmin;
1547 vfmax = info->monspecs.vfmax;
1548 dclkmin = info->monspecs.dclkmin;
1549 dclkmax = info->monspecs.dclkmax;
1550 }
1551
1552 if (!var->pixclock)
1553 return -EINVAL;
1554 pixclock = PICOS2KHZ(var->pixclock) * 1000;
8c85fd89
AH		 1555
1556 htotal = var->xres + var->right_margin + var->hsync_len +
1da177e4 1557 var->left_margin;
8c85fd89 1558 vtotal = var->yres + var->lower_margin + var->vsync_len +
1da177e4
LT		 1559 var->upper_margin;
1560
1561 if (var->vmode & FB_VMODE_INTERLACED)
1562 vtotal /= 2;
1563 if (var->vmode & FB_VMODE_DOUBLE)
1564 vtotal *= 2;
1565
1566 hfreq = pixclock/htotal;
0a793b77
JS		 1567 hfreq = (hfreq + 500) / 1000 * 1000;
1568
1da177e4
LT		 1569 vfreq = hfreq/vtotal;
1570
8c85fd89 1571 return (vfreq < vfmin || vfreq > vfmax ||
1da177e4
LT		 1572 hfreq < hfmin || hfreq > hfmax ||
1573 pixclock < dclkmin || pixclock > dclkmax) ?
1574 -EINVAL : 0;
1575}
1576
ba70710e 1577#if defined(CONFIG_FIRMWARE_EDID) && defined(CONFIG_X86)
5e518d76
AD		 1578
1579/*
1580 * We need to ensure that the EDID block is only returned for
1581 * the primary graphics adapter.
1582 */
1583
1584const unsigned char *fb_firmware_edid(struct device *device)
1585{
1586 struct pci_dev *dev = NULL;
1587 struct resource *res = NULL;
1588 unsigned char *edid = NULL;
1589
1590 if (device)
1591 dev = to_pci_dev(device);
1592
1593 if (dev)
1594 res = &dev->resource[PCI_ROM_RESOURCE];
1595
1596 if (res && res->flags & IORESOURCE_ROM_SHADOW)
1597 edid = edid_info.dummy;
1598
1599 return edid;
1600}
1601#else
1602const unsigned char *fb_firmware_edid(struct device *device)
1603{
1604 return NULL;
1605}
59153f7d
AD		 1606#endif
1607EXPORT_SYMBOL(fb_firmware_edid);
5e518d76 1608
1da177e4
LT		 1609EXPORT_SYMBOL(fb_parse_edid);
1610EXPORT_SYMBOL(fb_edid_to_monspecs);
e4105119 1611EXPORT_SYMBOL(fb_edid_add_monspecs);
1da177e4
LT		 1612EXPORT_SYMBOL(fb_get_mode);
1613EXPORT_SYMBOL(fb_validate_mode);
1614EXPORT_SYMBOL(fb_destroy_modedb);
Linux 6.x block layer and io_uring tree(s)