fbmon.c revision 19757fc8432ac97a07a890d6310cccc1896a1b36
1/* 2 * linux/drivers/video/fbmon.c 3 * 4 * Copyright (C) 2002 James Simmons <jsimmons@users.sf.net> 5 * 6 * Credits: 7 * 8 * The EDID Parser is a conglomeration from the following sources: 9 * 10 * 1. SciTech SNAP Graphics Architecture 11 * Copyright (C) 1991-2002 SciTech Software, Inc. All rights reserved. 12 * 13 * 2. XFree86 4.3.0, interpret_edid.c 14 * Copyright 1998 by Egbert Eich <Egbert.Eich@Physik.TU-Darmstadt.DE> 15 * 16 * 3. John Fremlin <vii@users.sourceforge.net> and 17 * Ani Joshi <ajoshi@unixbox.com> 18 * 19 * Generalized Timing Formula is derived from: 20 * 21 * GTF Spreadsheet by Andy Morrish (1/5/97) 22 * available at http://www.vesa.org 23 * 24 * This file is subject to the terms and conditions of the GNU General Public 25 * License. See the file COPYING in the main directory of this archive 26 * for more details. 27 * 28 */ 29#include <linux/fb.h> 30#include <linux/module.h> 31#include <linux/pci.h> 32#include <linux/slab.h> 33#include <video/edid.h> 34#include <video/of_videomode.h> 35#include <video/videomode.h> 36#ifdef CONFIG_PPC_OF 37#include <asm/prom.h> 38#include <asm/pci-bridge.h> 39#endif 40#include "../edid.h" 41 42/* 43 * EDID parser 44 */ 45 46#undef DEBUG /* define this for verbose EDID parsing output */ 47 48#ifdef DEBUG 49#define DPRINTK(fmt, args...) printk(fmt,## args) 50#else 51#define DPRINTK(fmt, args...) 52#endif 53 54#define FBMON_FIX_HEADER 1 55#define FBMON_FIX_INPUT 2 56#define FBMON_FIX_TIMINGS 3 57 58#ifdef CONFIG_FB_MODE_HELPERS 59struct broken_edid { 60 u8 manufacturer[4]; 61 u32 model; 62 u32 fix; 63}; 64 65static const struct broken_edid brokendb[] = { 66 /* DEC FR-PCXAV-YZ */ 67 { 68 .manufacturer = "DEC", 69 .model = 0x073a, 70 .fix = FBMON_FIX_HEADER, 71 }, 72 /* ViewSonic PF775a */ 73 { 74 .manufacturer = "VSC", 75 .model = 0x5a44, 76 .fix = FBMON_FIX_INPUT, 77 }, 78 /* Sharp UXGA? */ 79 { 80 .manufacturer = "SHP", 81 .model = 0x138e, 82 .fix = FBMON_FIX_TIMINGS, 83 }, 84}; 85 86static const unsigned char edid_v1_header[] = { 0x00, 0xff, 0xff, 0xff, 87 0xff, 0xff, 0xff, 0x00 88}; 89 90static void copy_string(unsigned char *c, unsigned char *s) 91{ 92 int i; 93 c = c + 5; 94 for (i = 0; (i < 13 && *c != 0x0A); i++) 95 *(s++) = *(c++); 96 *s = 0; 97 while (i-- && (*--s == 0x20)) *s = 0; 98} 99 100static int edid_is_serial_block(unsigned char *block) 101{ 102 if ((block[0] == 0x00) && (block[1] == 0x00) && 103 (block[2] == 0x00) && (block[3] == 0xff) && 104 (block[4] == 0x00)) 105 return 1; 106 else 107 return 0; 108} 109 110static int edid_is_ascii_block(unsigned char *block) 111{ 112 if ((block[0] == 0x00) && (block[1] == 0x00) && 113 (block[2] == 0x00) && (block[3] == 0xfe) && 114 (block[4] == 0x00)) 115 return 1; 116 else 117 return 0; 118} 119 120static int edid_is_limits_block(unsigned char *block) 121{ 122 if ((block[0] == 0x00) && (block[1] == 0x00) && 123 (block[2] == 0x00) && (block[3] == 0xfd) && 124 (block[4] == 0x00)) 125 return 1; 126 else 127 return 0; 128} 129 130static int edid_is_monitor_block(unsigned char *block) 131{ 132 if ((block[0] == 0x00) && (block[1] == 0x00) && 133 (block[2] == 0x00) && (block[3] == 0xfc) && 134 (block[4] == 0x00)) 135 return 1; 136 else 137 return 0; 138} 139 140static int edid_is_timing_block(unsigned char *block) 141{ 142 if ((block[0] != 0x00) || (block[1] != 0x00) || 143 (block[2] != 0x00) || (block[4] != 0x00)) 144 return 1; 145 else 146 return 0; 147} 148 149static int check_edid(unsigned char *edid) 150{ 151 unsigned char *block = edid + ID_MANUFACTURER_NAME, manufacturer[4]; 152 unsigned char *b; 153 u32 model; 154 int i, fix = 0, ret = 0; 155 156 manufacturer[0] = ((block[0] & 0x7c) >> 2) + '@'; 157 manufacturer[1] = ((block[0] & 0x03) << 3) + 158 ((block[1] & 0xe0) >> 5) + '@'; 159 manufacturer[2] = (block[1] & 0x1f) + '@'; 160 manufacturer[3] = 0; 161 model = block[2] + (block[3] << 8); 162 163 for (i = 0; i < ARRAY_SIZE(brokendb); i++) { 164 if (!strncmp(manufacturer, brokendb[i].manufacturer, 4) && 165 brokendb[i].model == model) { 166 fix = brokendb[i].fix; 167 break; 168 } 169 } 170 171 switch (fix) { 172 case FBMON_FIX_HEADER: 173 for (i = 0; i < 8; i++) { 174 if (edid[i] != edid_v1_header[i]) { 175 ret = fix; 176 break; 177 } 178 } 179 break; 180 case FBMON_FIX_INPUT: 181 b = edid + EDID_STRUCT_DISPLAY; 182 /* Only if display is GTF capable will 183 the input type be reset to analog */ 184 if (b[4] & 0x01 && b[0] & 0x80) 185 ret = fix; 186 break; 187 case FBMON_FIX_TIMINGS: 188 b = edid + DETAILED_TIMING_DESCRIPTIONS_START; 189 ret = fix; 190 191 for (i = 0; i < 4; i++) { 192 if (edid_is_limits_block(b)) { 193 ret = 0; 194 break; 195 } 196 197 b += DETAILED_TIMING_DESCRIPTION_SIZE; 198 } 199 200 break; 201 } 202 203 if (ret) 204 printk("fbmon: The EDID Block of " 205 "Manufacturer: %s Model: 0x%x is known to " 206 "be broken,\n", manufacturer, model); 207 208 return ret; 209} 210 211static void fix_edid(unsigned char *edid, int fix) 212{ 213 int i; 214 unsigned char *b, csum = 0; 215 216 switch (fix) { 217 case FBMON_FIX_HEADER: 218 printk("fbmon: trying a header reconstruct\n"); 219 memcpy(edid, edid_v1_header, 8); 220 break; 221 case FBMON_FIX_INPUT: 222 printk("fbmon: trying to fix input type\n"); 223 b = edid + EDID_STRUCT_DISPLAY; 224 b[0] &= ~0x80; 225 edid[127] += 0x80; 226 break; 227 case FBMON_FIX_TIMINGS: 228 printk("fbmon: trying to fix monitor timings\n"); 229 b = edid + DETAILED_TIMING_DESCRIPTIONS_START; 230 for (i = 0; i < 4; i++) { 231 if (!(edid_is_serial_block(b) || 232 edid_is_ascii_block(b) || 233 edid_is_monitor_block(b) || 234 edid_is_timing_block(b))) { 235 b[0] = 0x00; 236 b[1] = 0x00; 237 b[2] = 0x00; 238 b[3] = 0xfd; 239 b[4] = 0x00; 240 b[5] = 60; /* vfmin */ 241 b[6] = 60; /* vfmax */ 242 b[7] = 30; /* hfmin */ 243 b[8] = 75; /* hfmax */ 244 b[9] = 17; /* pixclock - 170 MHz*/ 245 b[10] = 0; /* GTF */ 246 break; 247 } 248 249 b += DETAILED_TIMING_DESCRIPTION_SIZE; 250 } 251 252 for (i = 0; i < EDID_LENGTH - 1; i++) 253 csum += edid[i]; 254 255 edid[127] = 256 - csum; 256 break; 257 } 258} 259 260static int edid_checksum(unsigned char *edid) 261{ 262 unsigned char csum = 0, all_null = 0; 263 int i, err = 0, fix = check_edid(edid); 264 265 if (fix) 266 fix_edid(edid, fix); 267 268 for (i = 0; i < EDID_LENGTH; i++) { 269 csum += edid[i]; 270 all_null |= edid[i]; 271 } 272 273 if (csum == 0x00 && all_null) { 274 /* checksum passed, everything's good */ 275 err = 1; 276 } 277 278 return err; 279} 280 281static int edid_check_header(unsigned char *edid) 282{ 283 int i, err = 1, fix = check_edid(edid); 284 285 if (fix) 286 fix_edid(edid, fix); 287 288 for (i = 0; i < 8; i++) { 289 if (edid[i] != edid_v1_header[i]) 290 err = 0; 291 } 292 293 return err; 294} 295 296static void parse_vendor_block(unsigned char *block, struct fb_monspecs *specs) 297{ 298 specs->manufacturer[0] = ((block[0] & 0x7c) >> 2) + '@'; 299 specs->manufacturer[1] = ((block[0] & 0x03) << 3) + 300 ((block[1] & 0xe0) >> 5) + '@'; 301 specs->manufacturer[2] = (block[1] & 0x1f) + '@'; 302 specs->manufacturer[3] = 0; 303 specs->model = block[2] + (block[3] << 8); 304 specs->serial = block[4] + (block[5] << 8) + 305 (block[6] << 16) + (block[7] << 24); 306 specs->year = block[9] + 1990; 307 specs->week = block[8]; 308 DPRINTK(" Manufacturer: %s\n", specs->manufacturer); 309 DPRINTK(" Model: %x\n", specs->model); 310 DPRINTK(" Serial#: %u\n", specs->serial); 311 DPRINTK(" Year: %u Week %u\n", specs->year, specs->week); 312} 313 314static void get_dpms_capabilities(unsigned char flags, 315 struct fb_monspecs *specs) 316{ 317 specs->dpms = 0; 318 if (flags & DPMS_ACTIVE_OFF) 319 specs->dpms |= FB_DPMS_ACTIVE_OFF; 320 if (flags & DPMS_SUSPEND) 321 specs->dpms |= FB_DPMS_SUSPEND; 322 if (flags & DPMS_STANDBY) 323 specs->dpms |= FB_DPMS_STANDBY; 324 DPRINTK(" DPMS: Active %s, Suspend %s, Standby %s\n", 325 (flags & DPMS_ACTIVE_OFF) ? "yes" : "no", 326 (flags & DPMS_SUSPEND) ? "yes" : "no", 327 (flags & DPMS_STANDBY) ? "yes" : "no"); 328} 329 330static void get_chroma(unsigned char *block, struct fb_monspecs *specs) 331{ 332 int tmp; 333 334 DPRINTK(" Chroma\n"); 335 /* Chromaticity data */ 336 tmp = ((block[5] & (3 << 6)) >> 6) | (block[0x7] << 2); 337 tmp *= 1000; 338 tmp += 512; 339 specs->chroma.redx = tmp/1024; 340 DPRINTK(" RedX: 0.%03d ", specs->chroma.redx); 341 342 tmp = ((block[5] & (3 << 4)) >> 4) | (block[0x8] << 2); 343 tmp *= 1000; 344 tmp += 512; 345 specs->chroma.redy = tmp/1024; 346 DPRINTK("RedY: 0.%03d\n", specs->chroma.redy); 347 348 tmp = ((block[5] & (3 << 2)) >> 2) | (block[0x9] << 2); 349 tmp *= 1000; 350 tmp += 512; 351 specs->chroma.greenx = tmp/1024; 352 DPRINTK(" GreenX: 0.%03d ", specs->chroma.greenx); 353 354 tmp = (block[5] & 3) | (block[0xa] << 2); 355 tmp *= 1000; 356 tmp += 512; 357 specs->chroma.greeny = tmp/1024; 358 DPRINTK("GreenY: 0.%03d\n", specs->chroma.greeny); 359 360 tmp = ((block[6] & (3 << 6)) >> 6) | (block[0xb] << 2); 361 tmp *= 1000; 362 tmp += 512; 363 specs->chroma.bluex = tmp/1024; 364 DPRINTK(" BlueX: 0.%03d ", specs->chroma.bluex); 365 366 tmp = ((block[6] & (3 << 4)) >> 4) | (block[0xc] << 2); 367 tmp *= 1000; 368 tmp += 512; 369 specs->chroma.bluey = tmp/1024; 370 DPRINTK("BlueY: 0.%03d\n", specs->chroma.bluey); 371 372 tmp = ((block[6] & (3 << 2)) >> 2) | (block[0xd] << 2); 373 tmp *= 1000; 374 tmp += 512; 375 specs->chroma.whitex = tmp/1024; 376 DPRINTK(" WhiteX: 0.%03d ", specs->chroma.whitex); 377 378 tmp = (block[6] & 3) | (block[0xe] << 2); 379 tmp *= 1000; 380 tmp += 512; 381 specs->chroma.whitey = tmp/1024; 382 DPRINTK("WhiteY: 0.%03d\n", specs->chroma.whitey); 383} 384 385static void calc_mode_timings(int xres, int yres, int refresh, 386 struct fb_videomode *mode) 387{ 388 struct fb_var_screeninfo *var; 389 390 var = kzalloc(sizeof(struct fb_var_screeninfo), GFP_KERNEL); 391 392 if (var) { 393 var->xres = xres; 394 var->yres = yres; 395 fb_get_mode(FB_VSYNCTIMINGS | FB_IGNOREMON, 396 refresh, var, NULL); 397 mode->xres = xres; 398 mode->yres = yres; 399 mode->pixclock = var->pixclock; 400 mode->refresh = refresh; 401 mode->left_margin = var->left_margin; 402 mode->right_margin = var->right_margin; 403 mode->upper_margin = var->upper_margin; 404 mode->lower_margin = var->lower_margin; 405 mode->hsync_len = var->hsync_len; 406 mode->vsync_len = var->vsync_len; 407 mode->vmode = 0; 408 mode->sync = 0; 409 kfree(var); 410 } 411} 412 413static int get_est_timing(unsigned char *block, struct fb_videomode *mode) 414{ 415 int num = 0; 416 unsigned char c; 417 418 c = block[0]; 419 if (c&0x80) { 420 calc_mode_timings(720, 400, 70, &mode[num]); 421 mode[num++].flag = FB_MODE_IS_CALCULATED; 422 DPRINTK(" 720x400@70Hz\n"); 423 } 424 if (c&0x40) { 425 calc_mode_timings(720, 400, 88, &mode[num]); 426 mode[num++].flag = FB_MODE_IS_CALCULATED; 427 DPRINTK(" 720x400@88Hz\n"); 428 } 429 if (c&0x20) { 430 mode[num++] = vesa_modes[3]; 431 DPRINTK(" 640x480@60Hz\n"); 432 } 433 if (c&0x10) { 434 calc_mode_timings(640, 480, 67, &mode[num]); 435 mode[num++].flag = FB_MODE_IS_CALCULATED; 436 DPRINTK(" 640x480@67Hz\n"); 437 } 438 if (c&0x08) { 439 mode[num++] = vesa_modes[4]; 440 DPRINTK(" 640x480@72Hz\n"); 441 } 442 if (c&0x04) { 443 mode[num++] = vesa_modes[5]; 444 DPRINTK(" 640x480@75Hz\n"); 445 } 446 if (c&0x02) { 447 mode[num++] = vesa_modes[7]; 448 DPRINTK(" 800x600@56Hz\n"); 449 } 450 if (c&0x01) { 451 mode[num++] = vesa_modes[8]; 452 DPRINTK(" 800x600@60Hz\n"); 453 } 454 455 c = block[1]; 456 if (c&0x80) { 457 mode[num++] = vesa_modes[9]; 458 DPRINTK(" 800x600@72Hz\n"); 459 } 460 if (c&0x40) { 461 mode[num++] = vesa_modes[10]; 462 DPRINTK(" 800x600@75Hz\n"); 463 } 464 if (c&0x20) { 465 calc_mode_timings(832, 624, 75, &mode[num]); 466 mode[num++].flag = FB_MODE_IS_CALCULATED; 467 DPRINTK(" 832x624@75Hz\n"); 468 } 469 if (c&0x10) { 470 mode[num++] = vesa_modes[12]; 471 DPRINTK(" 1024x768@87Hz Interlaced\n"); 472 } 473 if (c&0x08) { 474 mode[num++] = vesa_modes[13]; 475 DPRINTK(" 1024x768@60Hz\n"); 476 } 477 if (c&0x04) { 478 mode[num++] = vesa_modes[14]; 479 DPRINTK(" 1024x768@70Hz\n"); 480 } 481 if (c&0x02) { 482 mode[num++] = vesa_modes[15]; 483 DPRINTK(" 1024x768@75Hz\n"); 484 } 485 if (c&0x01) { 486 mode[num++] = vesa_modes[21]; 487 DPRINTK(" 1280x1024@75Hz\n"); 488 } 489 c = block[2]; 490 if (c&0x80) { 491 mode[num++] = vesa_modes[17]; 492 DPRINTK(" 1152x870@75Hz\n"); 493 } 494 DPRINTK(" Manufacturer's mask: %x\n",c&0x7F); 495 return num; 496} 497 498static int get_std_timing(unsigned char *block, struct fb_videomode *mode, 499 int ver, int rev) 500{ 501 int xres, yres = 0, refresh, ratio, i; 502 503 xres = (block[0] + 31) * 8; 504 if (xres <= 256) 505 return 0; 506 507 ratio = (block[1] & 0xc0) >> 6; 508 switch (ratio) { 509 case 0: 510 /* in EDID 1.3 the meaning of 0 changed to 16:10 (prior 1:1) */ 511 if (ver < 1 || (ver == 1 && rev < 3)) 512 yres = xres; 513 else 514 yres = (xres * 10)/16; 515 break; 516 case 1: 517 yres = (xres * 3)/4; 518 break; 519 case 2: 520 yres = (xres * 4)/5; 521 break; 522 case 3: 523 yres = (xres * 9)/16; 524 break; 525 } 526 refresh = (block[1] & 0x3f) + 60; 527 528 DPRINTK(" %dx%d@%dHz\n", xres, yres, refresh); 529 for (i = 0; i < VESA_MODEDB_SIZE; i++) { 530 if (vesa_modes[i].xres == xres && 531 vesa_modes[i].yres == yres && 532 vesa_modes[i].refresh == refresh) { 533 *mode = vesa_modes[i]; 534 mode->flag |= FB_MODE_IS_STANDARD; 535 return 1; 536 } 537 } 538 calc_mode_timings(xres, yres, refresh, mode); 539 return 1; 540} 541 542static int get_dst_timing(unsigned char *block, 543 struct fb_videomode *mode, int ver, int rev) 544{ 545 int j, num = 0; 546 547 for (j = 0; j < 6; j++, block += STD_TIMING_DESCRIPTION_SIZE) 548 num += get_std_timing(block, &mode[num], ver, rev); 549 550 return num; 551} 552 553static void get_detailed_timing(unsigned char *block, 554 struct fb_videomode *mode) 555{ 556 mode->xres = H_ACTIVE; 557 mode->yres = V_ACTIVE; 558 mode->pixclock = PIXEL_CLOCK; 559 mode->pixclock /= 1000; 560 mode->pixclock = KHZ2PICOS(mode->pixclock); 561 mode->right_margin = H_SYNC_OFFSET; 562 mode->left_margin = (H_ACTIVE + H_BLANKING) - 563 (H_ACTIVE + H_SYNC_OFFSET + H_SYNC_WIDTH); 564 mode->upper_margin = V_BLANKING - V_SYNC_OFFSET - 565 V_SYNC_WIDTH; 566 mode->lower_margin = V_SYNC_OFFSET; 567 mode->hsync_len = H_SYNC_WIDTH; 568 mode->vsync_len = V_SYNC_WIDTH; 569 if (HSYNC_POSITIVE) 570 mode->sync |= FB_SYNC_HOR_HIGH_ACT; 571 if (VSYNC_POSITIVE) 572 mode->sync |= FB_SYNC_VERT_HIGH_ACT; 573 mode->refresh = PIXEL_CLOCK/((H_ACTIVE + H_BLANKING) * 574 (V_ACTIVE + V_BLANKING)); 575 if (INTERLACED) { 576 mode->yres *= 2; 577 mode->upper_margin *= 2; 578 mode->lower_margin *= 2; 579 mode->vsync_len *= 2; 580 mode->vmode |= FB_VMODE_INTERLACED; 581 } 582 mode->flag = FB_MODE_IS_DETAILED; 583 584 DPRINTK(" %d MHz ", PIXEL_CLOCK/1000000); 585 DPRINTK("%d %d %d %d ", H_ACTIVE, H_ACTIVE + H_SYNC_OFFSET, 586 H_ACTIVE + H_SYNC_OFFSET + H_SYNC_WIDTH, H_ACTIVE + H_BLANKING); 587 DPRINTK("%d %d %d %d ", V_ACTIVE, V_ACTIVE + V_SYNC_OFFSET, 588 V_ACTIVE + V_SYNC_OFFSET + V_SYNC_WIDTH, V_ACTIVE + V_BLANKING); 589 DPRINTK("%sHSync %sVSync\n\n", (HSYNC_POSITIVE) ? "+" : "-", 590 (VSYNC_POSITIVE) ? "+" : "-"); 591} 592 593/** 594 * fb_create_modedb - create video mode database 595 * @edid: EDID data 596 * @dbsize: database size 597 * 598 * RETURNS: struct fb_videomode, @dbsize contains length of database 599 * 600 * DESCRIPTION: 601 * This function builds a mode database using the contents of the EDID 602 * data 603 */ 604static struct fb_videomode *fb_create_modedb(unsigned char *edid, int *dbsize) 605{ 606 struct fb_videomode *mode, *m; 607 unsigned char *block; 608 int num = 0, i, first = 1; 609 int ver, rev; 610 611 ver = edid[EDID_STRUCT_VERSION]; 612 rev = edid[EDID_STRUCT_REVISION]; 613 614 mode = kzalloc(50 * sizeof(struct fb_videomode), GFP_KERNEL); 615 if (mode == NULL) 616 return NULL; 617 618 if (edid == NULL || !edid_checksum(edid) || 619 !edid_check_header(edid)) { 620 kfree(mode); 621 return NULL; 622 } 623 624 *dbsize = 0; 625 626 DPRINTK(" Detailed Timings\n"); 627 block = edid + DETAILED_TIMING_DESCRIPTIONS_START; 628 for (i = 0; i < 4; i++, block+= DETAILED_TIMING_DESCRIPTION_SIZE) { 629 if (!(block[0] == 0x00 && block[1] == 0x00)) { 630 get_detailed_timing(block, &mode[num]); 631 if (first) { 632 mode[num].flag |= FB_MODE_IS_FIRST; 633 first = 0; 634 } 635 num++; 636 } 637 } 638 639 DPRINTK(" Supported VESA Modes\n"); 640 block = edid + ESTABLISHED_TIMING_1; 641 num += get_est_timing(block, &mode[num]); 642 643 DPRINTK(" Standard Timings\n"); 644 block = edid + STD_TIMING_DESCRIPTIONS_START; 645 for (i = 0; i < STD_TIMING; i++, block += STD_TIMING_DESCRIPTION_SIZE) 646 num += get_std_timing(block, &mode[num], ver, rev); 647 648 block = edid + DETAILED_TIMING_DESCRIPTIONS_START; 649 for (i = 0; i < 4; i++, block+= DETAILED_TIMING_DESCRIPTION_SIZE) { 650 if (block[0] == 0x00 && block[1] == 0x00 && block[3] == 0xfa) 651 num += get_dst_timing(block + 5, &mode[num], ver, rev); 652 } 653 654 /* Yikes, EDID data is totally useless */ 655 if (!num) { 656 kfree(mode); 657 return NULL; 658 } 659 660 *dbsize = num; 661 m = kmalloc(num * sizeof(struct fb_videomode), GFP_KERNEL); 662 if (!m) 663 return mode; 664 memmove(m, mode, num * sizeof(struct fb_videomode)); 665 kfree(mode); 666 return m; 667} 668 669/** 670 * fb_destroy_modedb - destroys mode database 671 * @modedb: mode database to destroy 672 * 673 * DESCRIPTION: 674 * Destroy mode database created by fb_create_modedb 675 */ 676void fb_destroy_modedb(struct fb_videomode *modedb) 677{ 678 kfree(modedb); 679} 680 681static int fb_get_monitor_limits(unsigned char *edid, struct fb_monspecs *specs) 682{ 683 int i, retval = 1; 684 unsigned char *block; 685 686 block = edid + DETAILED_TIMING_DESCRIPTIONS_START; 687 688 DPRINTK(" Monitor Operating Limits: "); 689 690 for (i = 0; i < 4; i++, block += DETAILED_TIMING_DESCRIPTION_SIZE) { 691 if (edid_is_limits_block(block)) { 692 specs->hfmin = H_MIN_RATE * 1000; 693 specs->hfmax = H_MAX_RATE * 1000; 694 specs->vfmin = V_MIN_RATE; 695 specs->vfmax = V_MAX_RATE; 696 specs->dclkmax = MAX_PIXEL_CLOCK * 1000000; 697 specs->gtf = (GTF_SUPPORT) ? 1 : 0; 698 retval = 0; 699 DPRINTK("From EDID\n"); 700 break; 701 } 702 } 703 704 /* estimate monitor limits based on modes supported */ 705 if (retval) { 706 struct fb_videomode *modes, *mode; 707 int num_modes, hz, hscan, pixclock; 708 int vtotal, htotal; 709 710 modes = fb_create_modedb(edid, &num_modes); 711 if (!modes) { 712 DPRINTK("None Available\n"); 713 return 1; 714 } 715 716 retval = 0; 717 for (i = 0; i < num_modes; i++) { 718 mode = &modes[i]; 719 pixclock = PICOS2KHZ(modes[i].pixclock) * 1000; 720 htotal = mode->xres + mode->right_margin + mode->hsync_len 721 + mode->left_margin; 722 vtotal = mode->yres + mode->lower_margin + mode->vsync_len 723 + mode->upper_margin; 724 725 if (mode->vmode & FB_VMODE_INTERLACED) 726 vtotal /= 2; 727 728 if (mode->vmode & FB_VMODE_DOUBLE) 729 vtotal *= 2; 730 731 hscan = (pixclock + htotal / 2) / htotal; 732 hscan = (hscan + 500) / 1000 * 1000; 733 hz = (hscan + vtotal / 2) / vtotal; 734 735 if (specs->dclkmax == 0 || specs->dclkmax < pixclock) 736 specs->dclkmax = pixclock; 737 738 if (specs->dclkmin == 0 || specs->dclkmin > pixclock) 739 specs->dclkmin = pixclock; 740 741 if (specs->hfmax == 0 || specs->hfmax < hscan) 742 specs->hfmax = hscan; 743 744 if (specs->hfmin == 0 || specs->hfmin > hscan) 745 specs->hfmin = hscan; 746 747 if (specs->vfmax == 0 || specs->vfmax < hz) 748 specs->vfmax = hz; 749 750 if (specs->vfmin == 0 || specs->vfmin > hz) 751 specs->vfmin = hz; 752 } 753 DPRINTK("Extrapolated\n"); 754 fb_destroy_modedb(modes); 755 } 756 DPRINTK(" H: %d-%dKHz V: %d-%dHz DCLK: %dMHz\n", 757 specs->hfmin/1000, specs->hfmax/1000, specs->vfmin, 758 specs->vfmax, specs->dclkmax/1000000); 759 return retval; 760} 761 762static void get_monspecs(unsigned char *edid, struct fb_monspecs *specs) 763{ 764 unsigned char c, *block; 765 766 block = edid + EDID_STRUCT_DISPLAY; 767 768 fb_get_monitor_limits(edid, specs); 769 770 c = block[0] & 0x80; 771 specs->input = 0; 772 if (c) { 773 specs->input |= FB_DISP_DDI; 774 DPRINTK(" Digital Display Input"); 775 } else { 776 DPRINTK(" Analog Display Input: Input Voltage - "); 777 switch ((block[0] & 0x60) >> 5) { 778 case 0: 779 DPRINTK("0.700V/0.300V"); 780 specs->input |= FB_DISP_ANA_700_300; 781 break; 782 case 1: 783 DPRINTK("0.714V/0.286V"); 784 specs->input |= FB_DISP_ANA_714_286; 785 break; 786 case 2: 787 DPRINTK("1.000V/0.400V"); 788 specs->input |= FB_DISP_ANA_1000_400; 789 break; 790 case 3: 791 DPRINTK("0.700V/0.000V"); 792 specs->input |= FB_DISP_ANA_700_000; 793 break; 794 } 795 } 796 DPRINTK("\n Sync: "); 797 c = block[0] & 0x10; 798 if (c) 799 DPRINTK(" Configurable signal level\n"); 800 c = block[0] & 0x0f; 801 specs->signal = 0; 802 if (c & 0x10) { 803 DPRINTK("Blank to Blank "); 804 specs->signal |= FB_SIGNAL_BLANK_BLANK; 805 } 806 if (c & 0x08) { 807 DPRINTK("Separate "); 808 specs->signal |= FB_SIGNAL_SEPARATE; 809 } 810 if (c & 0x04) { 811 DPRINTK("Composite "); 812 specs->signal |= FB_SIGNAL_COMPOSITE; 813 } 814 if (c & 0x02) { 815 DPRINTK("Sync on Green "); 816 specs->signal |= FB_SIGNAL_SYNC_ON_GREEN; 817 } 818 if (c & 0x01) { 819 DPRINTK("Serration on "); 820 specs->signal |= FB_SIGNAL_SERRATION_ON; 821 } 822 DPRINTK("\n"); 823 specs->max_x = block[1]; 824 specs->max_y = block[2]; 825 DPRINTK(" Max H-size in cm: "); 826 if (specs->max_x) 827 DPRINTK("%d\n", specs->max_x); 828 else 829 DPRINTK("variable\n"); 830 DPRINTK(" Max V-size in cm: "); 831 if (specs->max_y) 832 DPRINTK("%d\n", specs->max_y); 833 else 834 DPRINTK("variable\n"); 835 836 c = block[3]; 837 specs->gamma = c+100; 838 DPRINTK(" Gamma: "); 839 DPRINTK("%d.%d\n", specs->gamma/100, specs->gamma % 100); 840 841 get_dpms_capabilities(block[4], specs); 842 843 switch ((block[4] & 0x18) >> 3) { 844 case 0: 845 DPRINTK(" Monochrome/Grayscale\n"); 846 specs->input |= FB_DISP_MONO; 847 break; 848 case 1: 849 DPRINTK(" RGB Color Display\n"); 850 specs->input |= FB_DISP_RGB; 851 break; 852 case 2: 853 DPRINTK(" Non-RGB Multicolor Display\n"); 854 specs->input |= FB_DISP_MULTI; 855 break; 856 default: 857 DPRINTK(" Unknown\n"); 858 specs->input |= FB_DISP_UNKNOWN; 859 break; 860 } 861 862 get_chroma(block, specs); 863 864 specs->misc = 0; 865 c = block[4] & 0x7; 866 if (c & 0x04) { 867 DPRINTK(" Default color format is primary\n"); 868 specs->misc |= FB_MISC_PRIM_COLOR; 869 } 870 if (c & 0x02) { 871 DPRINTK(" First DETAILED Timing is preferred\n"); 872 specs->misc |= FB_MISC_1ST_DETAIL; 873 } 874 if (c & 0x01) { 875 printk(" Display is GTF capable\n"); 876 specs->gtf = 1; 877 } 878} 879 880int fb_parse_edid(unsigned char *edid, struct fb_var_screeninfo *var) 881{ 882 int i; 883 unsigned char *block; 884 885 if (edid == NULL || var == NULL) 886 return 1; 887 888 if (!(edid_checksum(edid))) 889 return 1; 890 891 if (!(edid_check_header(edid))) 892 return 1; 893 894 block = edid + DETAILED_TIMING_DESCRIPTIONS_START; 895 896 for (i = 0; i < 4; i++, block += DETAILED_TIMING_DESCRIPTION_SIZE) { 897 if (edid_is_timing_block(block)) { 898 var->xres = var->xres_virtual = H_ACTIVE; 899 var->yres = var->yres_virtual = V_ACTIVE; 900 var->height = var->width = 0; 901 var->right_margin = H_SYNC_OFFSET; 902 var->left_margin = (H_ACTIVE + H_BLANKING) - 903 (H_ACTIVE + H_SYNC_OFFSET + H_SYNC_WIDTH); 904 var->upper_margin = V_BLANKING - V_SYNC_OFFSET - 905 V_SYNC_WIDTH; 906 var->lower_margin = V_SYNC_OFFSET; 907 var->hsync_len = H_SYNC_WIDTH; 908 var->vsync_len = V_SYNC_WIDTH; 909 var->pixclock = PIXEL_CLOCK; 910 var->pixclock /= 1000; 911 var->pixclock = KHZ2PICOS(var->pixclock); 912 913 if (HSYNC_POSITIVE) 914 var->sync |= FB_SYNC_HOR_HIGH_ACT; 915 if (VSYNC_POSITIVE) 916 var->sync |= FB_SYNC_VERT_HIGH_ACT; 917 return 0; 918 } 919 } 920 return 1; 921} 922 923void fb_edid_to_monspecs(unsigned char *edid, struct fb_monspecs *specs) 924{ 925 unsigned char *block; 926 int i, found = 0; 927 928 if (edid == NULL) 929 return; 930 931 if (!(edid_checksum(edid))) 932 return; 933 934 if (!(edid_check_header(edid))) 935 return; 936 937 memset(specs, 0, sizeof(struct fb_monspecs)); 938 939 specs->version = edid[EDID_STRUCT_VERSION]; 940 specs->revision = edid[EDID_STRUCT_REVISION]; 941 942 DPRINTK("========================================\n"); 943 DPRINTK("Display Information (EDID)\n"); 944 DPRINTK("========================================\n"); 945 DPRINTK(" EDID Version %d.%d\n", (int) specs->version, 946 (int) specs->revision); 947 948 parse_vendor_block(edid + ID_MANUFACTURER_NAME, specs); 949 950 block = edid + DETAILED_TIMING_DESCRIPTIONS_START; 951 for (i = 0; i < 4; i++, block += DETAILED_TIMING_DESCRIPTION_SIZE) { 952 if (edid_is_serial_block(block)) { 953 copy_string(block, specs->serial_no); 954 DPRINTK(" Serial Number: %s\n", specs->serial_no); 955 } else if (edid_is_ascii_block(block)) { 956 copy_string(block, specs->ascii); 957 DPRINTK(" ASCII Block: %s\n", specs->ascii); 958 } else if (edid_is_monitor_block(block)) { 959 copy_string(block, specs->monitor); 960 DPRINTK(" Monitor Name: %s\n", specs->monitor); 961 } 962 } 963 964 DPRINTK(" Display Characteristics:\n"); 965 get_monspecs(edid, specs); 966 967 specs->modedb = fb_create_modedb(edid, &specs->modedb_len); 968 969 /* 970 * Workaround for buggy EDIDs that sets that the first 971 * detailed timing is preferred but has not detailed 972 * timing specified 973 */ 974 for (i = 0; i < specs->modedb_len; i++) { 975 if (specs->modedb[i].flag & FB_MODE_IS_DETAILED) { 976 found = 1; 977 break; 978 } 979 } 980 981 if (!found) 982 specs->misc &= ~FB_MISC_1ST_DETAIL; 983 984 DPRINTK("========================================\n"); 985} 986 987/** 988 * fb_edid_add_monspecs() - add monitor video modes from E-EDID data 989 * @edid: 128 byte array with an E-EDID block 990 * @spacs: monitor specs to be extended 991 */ 992void fb_edid_add_monspecs(unsigned char *edid, struct fb_monspecs *specs) 993{ 994 unsigned char *block; 995 struct fb_videomode *m; 996 int num = 0, i; 997 u8 svd[64], edt[(128 - 4) / DETAILED_TIMING_DESCRIPTION_SIZE]; 998 u8 pos = 4, svd_n = 0; 999 1000 if (!edid) 1001 return; 1002 1003 if (!edid_checksum(edid)) 1004 return; 1005 1006 if (edid[0] != 0x2 || 1007 edid[2] < 4 || edid[2] > 128 - DETAILED_TIMING_DESCRIPTION_SIZE) 1008 return; 1009 1010 DPRINTK(" Short Video Descriptors\n"); 1011 1012 while (pos < edid[2]) { 1013 u8 len = edid[pos] & 0x1f, type = (edid[pos] >> 5) & 7; 1014 pr_debug("Data block %u of %u bytes\n", type, len); 1015 if (type == 2) 1016 for (i = pos; i < pos + len; i++) { 1017 u8 idx = edid[pos + i] & 0x7f; 1018 svd[svd_n++] = idx; 1019 pr_debug("N%sative mode #%d\n", 1020 edid[pos + i] & 0x80 ? "" : "on-n", idx); 1021 } 1022 pos += len + 1; 1023 } 1024 1025 block = edid + edid[2]; 1026 1027 DPRINTK(" Extended Detailed Timings\n"); 1028 1029 for (i = 0; i < (128 - edid[2]) / DETAILED_TIMING_DESCRIPTION_SIZE; 1030 i++, block += DETAILED_TIMING_DESCRIPTION_SIZE) 1031 if (PIXEL_CLOCK) 1032 edt[num++] = block - edid; 1033 1034 /* Yikes, EDID data is totally useless */ 1035 if (!(num + svd_n)) 1036 return; 1037 1038 m = kzalloc((specs->modedb_len + num + svd_n) * 1039 sizeof(struct fb_videomode), GFP_KERNEL); 1040 1041 if (!m) 1042 return; 1043 1044 memcpy(m, specs->modedb, specs->modedb_len * sizeof(struct fb_videomode)); 1045 1046 for (i = specs->modedb_len; i < specs->modedb_len + num; i++) { 1047 get_detailed_timing(edid + edt[i - specs->modedb_len], &m[i]); 1048 if (i == specs->modedb_len) 1049 m[i].flag |= FB_MODE_IS_FIRST; 1050 pr_debug("Adding %ux%u@%u\n", m[i].xres, m[i].yres, m[i].refresh); 1051 } 1052 1053 for (i = specs->modedb_len + num; i < specs->modedb_len + num + svd_n; i++) { 1054 int idx = svd[i - specs->modedb_len - num]; 1055 if (!idx || idx > 63) { 1056 pr_warning("Reserved SVD code %d\n", idx); 1057 } else if (idx > ARRAY_SIZE(cea_modes) || !cea_modes[idx].xres) { 1058 pr_warning("Unimplemented SVD code %d\n", idx); 1059 } else { 1060 memcpy(&m[i], cea_modes + idx, sizeof(m[i])); 1061 pr_debug("Adding SVD #%d: %ux%u@%u\n", idx, 1062 m[i].xres, m[i].yres, m[i].refresh); 1063 } 1064 } 1065 1066 kfree(specs->modedb); 1067 specs->modedb = m; 1068 specs->modedb_len = specs->modedb_len + num + svd_n; 1069} 1070 1071/* 1072 * VESA Generalized Timing Formula (GTF) 1073 */ 1074 1075#define FLYBACK 550 1076#define V_FRONTPORCH 1 1077#define H_OFFSET 40 1078#define H_SCALEFACTOR 20 1079#define H_BLANKSCALE 128 1080#define H_GRADIENT 600 1081#define C_VAL 30 1082#define M_VAL 300 1083 1084struct __fb_timings { 1085 u32 dclk; 1086 u32 hfreq; 1087 u32 vfreq; 1088 u32 hactive; 1089 u32 vactive; 1090 u32 hblank; 1091 u32 vblank; 1092 u32 htotal; 1093 u32 vtotal; 1094}; 1095 1096/** 1097 * fb_get_vblank - get vertical blank time 1098 * @hfreq: horizontal freq 1099 * 1100 * DESCRIPTION: 1101 * vblank = right_margin + vsync_len + left_margin 1102 * 1103 * given: right_margin = 1 (V_FRONTPORCH) 1104 * vsync_len = 3 1105 * flyback = 550 1106 * 1107 * flyback * hfreq 1108 * left_margin = --------------- - vsync_len 1109 * 1000000 1110 */ 1111static u32 fb_get_vblank(u32 hfreq) 1112{ 1113 u32 vblank; 1114 1115 vblank = (hfreq * FLYBACK)/1000; 1116 vblank = (vblank + 500)/1000; 1117 return (vblank + V_FRONTPORCH); 1118} 1119 1120/** 1121 * fb_get_hblank_by_freq - get horizontal blank time given hfreq 1122 * @hfreq: horizontal freq 1123 * @xres: horizontal resolution in pixels 1124 * 1125 * DESCRIPTION: 1126 * 1127 * xres * duty_cycle 1128 * hblank = ------------------ 1129 * 100 - duty_cycle 1130 * 1131 * duty cycle = percent of htotal assigned to inactive display 1132 * duty cycle = C - (M/Hfreq) 1133 * 1134 * where: C = ((offset - scale factor) * blank_scale) 1135 * -------------------------------------- + scale factor 1136 * 256 1137 * M = blank_scale * gradient 1138 * 1139 */ 1140static u32 fb_get_hblank_by_hfreq(u32 hfreq, u32 xres) 1141{ 1142 u32 c_val, m_val, duty_cycle, hblank; 1143 1144 c_val = (((H_OFFSET - H_SCALEFACTOR) * H_BLANKSCALE)/256 + 1145 H_SCALEFACTOR) * 1000; 1146 m_val = (H_BLANKSCALE * H_GRADIENT)/256; 1147 m_val = (m_val * 1000000)/hfreq; 1148 duty_cycle = c_val - m_val; 1149 hblank = (xres * duty_cycle)/(100000 - duty_cycle); 1150 return (hblank); 1151} 1152 1153/** 1154 * fb_get_hblank_by_dclk - get horizontal blank time given pixelclock 1155 * @dclk: pixelclock in Hz 1156 * @xres: horizontal resolution in pixels 1157 * 1158 * DESCRIPTION: 1159 * 1160 * xres * duty_cycle 1161 * hblank = ------------------ 1162 * 100 - duty_cycle 1163 * 1164 * duty cycle = percent of htotal assigned to inactive display 1165 * duty cycle = C - (M * h_period) 1166 * 1167 * where: h_period = SQRT(100 - C + (0.4 * xres * M)/dclk) + C - 100 1168 * ----------------------------------------------- 1169 * 2 * M 1170 * M = 300; 1171 * C = 30; 1172 1173 */ 1174static u32 fb_get_hblank_by_dclk(u32 dclk, u32 xres) 1175{ 1176 u32 duty_cycle, h_period, hblank; 1177 1178 dclk /= 1000; 1179 h_period = 100 - C_VAL; 1180 h_period *= h_period; 1181 h_period += (M_VAL * xres * 2 * 1000)/(5 * dclk); 1182 h_period *= 10000; 1183 1184 h_period = int_sqrt(h_period); 1185 h_period -= (100 - C_VAL) * 100; 1186 h_period *= 1000; 1187 h_period /= 2 * M_VAL; 1188 1189 duty_cycle = C_VAL * 1000 - (M_VAL * h_period)/100; 1190 hblank = (xres * duty_cycle)/(100000 - duty_cycle) + 8; 1191 hblank &= ~15; 1192 return (hblank); 1193} 1194 1195/** 1196 * fb_get_hfreq - estimate hsync 1197 * @vfreq: vertical refresh rate 1198 * @yres: vertical resolution 1199 * 1200 * DESCRIPTION: 1201 * 1202 * (yres + front_port) * vfreq * 1000000 1203 * hfreq = ------------------------------------- 1204 * (1000000 - (vfreq * FLYBACK) 1205 * 1206 */ 1207 1208static u32 fb_get_hfreq(u32 vfreq, u32 yres) 1209{ 1210 u32 divisor, hfreq; 1211 1212 divisor = (1000000 - (vfreq * FLYBACK))/1000; 1213 hfreq = (yres + V_FRONTPORCH) * vfreq * 1000; 1214 return (hfreq/divisor); 1215} 1216 1217static void fb_timings_vfreq(struct __fb_timings *timings) 1218{ 1219 timings->hfreq = fb_get_hfreq(timings->vfreq, timings->vactive); 1220 timings->vblank = fb_get_vblank(timings->hfreq); 1221 timings->vtotal = timings->vactive + timings->vblank; 1222 timings->hblank = fb_get_hblank_by_hfreq(timings->hfreq, 1223 timings->hactive); 1224 timings->htotal = timings->hactive + timings->hblank; 1225 timings->dclk = timings->htotal * timings->hfreq; 1226} 1227 1228static void fb_timings_hfreq(struct __fb_timings *timings) 1229{ 1230 timings->vblank = fb_get_vblank(timings->hfreq); 1231 timings->vtotal = timings->vactive + timings->vblank; 1232 timings->vfreq = timings->hfreq/timings->vtotal; 1233 timings->hblank = fb_get_hblank_by_hfreq(timings->hfreq, 1234 timings->hactive); 1235 timings->htotal = timings->hactive + timings->hblank; 1236 timings->dclk = timings->htotal * timings->hfreq; 1237} 1238 1239static void fb_timings_dclk(struct __fb_timings *timings) 1240{ 1241 timings->hblank = fb_get_hblank_by_dclk(timings->dclk, 1242 timings->hactive); 1243 timings->htotal = timings->hactive + timings->hblank; 1244 timings->hfreq = timings->dclk/timings->htotal; 1245 timings->vblank = fb_get_vblank(timings->hfreq); 1246 timings->vtotal = timings->vactive + timings->vblank; 1247 timings->vfreq = timings->hfreq/timings->vtotal; 1248} 1249 1250/* 1251 * fb_get_mode - calculates video mode using VESA GTF 1252 * @flags: if: 0 - maximize vertical refresh rate 1253 * 1 - vrefresh-driven calculation; 1254 * 2 - hscan-driven calculation; 1255 * 3 - pixelclock-driven calculation; 1256 * @val: depending on @flags, ignored, vrefresh, hsync or pixelclock 1257 * @var: pointer to fb_var_screeninfo 1258 * @info: pointer to fb_info 1259 * 1260 * DESCRIPTION: 1261 * Calculates video mode based on monitor specs using VESA GTF. 1262 * The GTF is best for VESA GTF compliant monitors but is 1263 * specifically formulated to work for older monitors as well. 1264 * 1265 * If @flag==0, the function will attempt to maximize the 1266 * refresh rate. Otherwise, it will calculate timings based on 1267 * the flag and accompanying value. 1268 * 1269 * If FB_IGNOREMON bit is set in @flags, monitor specs will be 1270 * ignored and @var will be filled with the calculated timings. 1271 * 1272 * All calculations are based on the VESA GTF Spreadsheet 1273 * available at VESA's public ftp (http://www.vesa.org). 1274 * 1275 * NOTES: 1276 * The timings generated by the GTF will be different from VESA 1277 * DMT. It might be a good idea to keep a table of standard 1278 * VESA modes as well. The GTF may also not work for some displays, 1279 * such as, and especially, analog TV. 1280 * 1281 * REQUIRES: 1282 * A valid info->monspecs, otherwise 'safe numbers' will be used. 1283 */ 1284int fb_get_mode(int flags, u32 val, struct fb_var_screeninfo *var, struct fb_info *info) 1285{ 1286 struct __fb_timings *timings; 1287 u32 interlace = 1, dscan = 1; 1288 u32 hfmin, hfmax, vfmin, vfmax, dclkmin, dclkmax, err = 0; 1289 1290 1291 timings = kzalloc(sizeof(struct __fb_timings), GFP_KERNEL); 1292 1293 if (!timings) 1294 return -ENOMEM; 1295 1296 /* 1297 * If monspecs are invalid, use values that are enough 1298 * for 640x480@60 1299 */ 1300 if (!info || !info->monspecs.hfmax || !info->monspecs.vfmax || 1301 !info->monspecs.dclkmax || 1302 info->monspecs.hfmax < info->monspecs.hfmin || 1303 info->monspecs.vfmax < info->monspecs.vfmin || 1304 info->monspecs.dclkmax < info->monspecs.dclkmin) { 1305 hfmin = 29000; hfmax = 30000; 1306 vfmin = 60; vfmax = 60; 1307 dclkmin = 0; dclkmax = 25000000; 1308 } else { 1309 hfmin = info->monspecs.hfmin; 1310 hfmax = info->monspecs.hfmax; 1311 vfmin = info->monspecs.vfmin; 1312 vfmax = info->monspecs.vfmax; 1313 dclkmin = info->monspecs.dclkmin; 1314 dclkmax = info->monspecs.dclkmax; 1315 } 1316 1317 timings->hactive = var->xres; 1318 timings->vactive = var->yres; 1319 if (var->vmode & FB_VMODE_INTERLACED) { 1320 timings->vactive /= 2; 1321 interlace = 2; 1322 } 1323 if (var->vmode & FB_VMODE_DOUBLE) { 1324 timings->vactive *= 2; 1325 dscan = 2; 1326 } 1327 1328 switch (flags & ~FB_IGNOREMON) { 1329 case FB_MAXTIMINGS: /* maximize refresh rate */ 1330 timings->hfreq = hfmax; 1331 fb_timings_hfreq(timings); 1332 if (timings->vfreq > vfmax) { 1333 timings->vfreq = vfmax; 1334 fb_timings_vfreq(timings); 1335 } 1336 if (timings->dclk > dclkmax) { 1337 timings->dclk = dclkmax; 1338 fb_timings_dclk(timings); 1339 } 1340 break; 1341 case FB_VSYNCTIMINGS: /* vrefresh driven */ 1342 timings->vfreq = val; 1343 fb_timings_vfreq(timings); 1344 break; 1345 case FB_HSYNCTIMINGS: /* hsync driven */ 1346 timings->hfreq = val; 1347 fb_timings_hfreq(timings); 1348 break; 1349 case FB_DCLKTIMINGS: /* pixelclock driven */ 1350 timings->dclk = PICOS2KHZ(val) * 1000; 1351 fb_timings_dclk(timings); 1352 break; 1353 default: 1354 err = -EINVAL; 1355 1356 } 1357 1358 if (err || (!(flags & FB_IGNOREMON) && 1359 (timings->vfreq < vfmin || timings->vfreq > vfmax || 1360 timings->hfreq < hfmin || timings->hfreq > hfmax || 1361 timings->dclk < dclkmin || timings->dclk > dclkmax))) { 1362 err = -EINVAL; 1363 } else { 1364 var->pixclock = KHZ2PICOS(timings->dclk/1000); 1365 var->hsync_len = (timings->htotal * 8)/100; 1366 var->right_margin = (timings->hblank/2) - var->hsync_len; 1367 var->left_margin = timings->hblank - var->right_margin - 1368 var->hsync_len; 1369 var->vsync_len = (3 * interlace)/dscan; 1370 var->lower_margin = (1 * interlace)/dscan; 1371 var->upper_margin = (timings->vblank * interlace)/dscan - 1372 (var->vsync_len + var->lower_margin); 1373 } 1374 1375 kfree(timings); 1376 return err; 1377} 1378 1379#ifdef CONFIG_VIDEOMODE_HELPERS 1380int fb_videomode_from_videomode(const struct videomode *vm, 1381 struct fb_videomode *fbmode) 1382{ 1383 unsigned int htotal, vtotal; 1384 1385 fbmode->xres = vm->hactive; 1386 fbmode->left_margin = vm->hback_porch; 1387 fbmode->right_margin = vm->hfront_porch; 1388 fbmode->hsync_len = vm->hsync_len; 1389 1390 fbmode->yres = vm->vactive; 1391 fbmode->upper_margin = vm->vback_porch; 1392 fbmode->lower_margin = vm->vfront_porch; 1393 fbmode->vsync_len = vm->vsync_len; 1394 1395 /* prevent division by zero in KHZ2PICOS macro */ 1396 fbmode->pixclock = vm->pixelclock ? 1397 KHZ2PICOS(vm->pixelclock / 1000) : 0; 1398 1399 fbmode->sync = 0; 1400 fbmode->vmode = 0; 1401 if (vm->flags & DISPLAY_FLAGS_HSYNC_HIGH) 1402 fbmode->sync |= FB_SYNC_HOR_HIGH_ACT; 1403 if (vm->flags & DISPLAY_FLAGS_VSYNC_HIGH) 1404 fbmode->sync |= FB_SYNC_VERT_HIGH_ACT; 1405 if (vm->flags & DISPLAY_FLAGS_INTERLACED) 1406 fbmode->vmode |= FB_VMODE_INTERLACED; 1407 if (vm->flags & DISPLAY_FLAGS_DOUBLESCAN) 1408 fbmode->vmode |= FB_VMODE_DOUBLE; 1409 fbmode->flag = 0; 1410 1411 htotal = vm->hactive + vm->hfront_porch + vm->hback_porch + 1412 vm->hsync_len; 1413 vtotal = vm->vactive + vm->vfront_porch + vm->vback_porch + 1414 vm->vsync_len; 1415 /* prevent division by zero */ 1416 if (htotal && vtotal) { 1417 fbmode->refresh = vm->pixelclock / (htotal * vtotal); 1418 /* a mode must have htotal and vtotal != 0 or it is invalid */ 1419 } else { 1420 fbmode->refresh = 0; 1421 return -EINVAL; 1422 } 1423 1424 return 0; 1425} 1426EXPORT_SYMBOL_GPL(fb_videomode_from_videomode); 1427 1428#ifdef CONFIG_OF 1429static inline void dump_fb_videomode(const struct fb_videomode *m) 1430{ 1431 pr_debug("fb_videomode = %ux%u@%uHz (%ukHz) %u %u %u %u %u %u %u %u %u\n", 1432 m->xres, m->yres, m->refresh, m->pixclock, m->left_margin, 1433 m->right_margin, m->upper_margin, m->lower_margin, 1434 m->hsync_len, m->vsync_len, m->sync, m->vmode, m->flag); 1435} 1436 1437/** 1438 * of_get_fb_videomode - get a fb_videomode from devicetree 1439 * @np: device_node with the timing specification 1440 * @fb: will be set to the return value 1441 * @index: index into the list of display timings in devicetree 1442 * 1443 * DESCRIPTION: 1444 * This function is expensive and should only be used, if only one mode is to be 1445 * read from DT. To get multiple modes start with of_get_display_timings ond 1446 * work with that instead. 1447 */ 1448int of_get_fb_videomode(struct device_node *np, struct fb_videomode *fb, 1449 int index) 1450{ 1451 struct videomode vm; 1452 int ret; 1453 1454 ret = of_get_videomode(np, &vm, index); 1455 if (ret) 1456 return ret; 1457 1458 fb_videomode_from_videomode(&vm, fb); 1459 1460 pr_debug("%s: got %dx%d display mode from %s\n", 1461 of_node_full_name(np), vm.hactive, vm.vactive, np->name); 1462 dump_fb_videomode(fb); 1463 1464 return 0; 1465} 1466EXPORT_SYMBOL_GPL(of_get_fb_videomode); 1467#endif /* CONFIG_OF */ 1468#endif /* CONFIG_VIDEOMODE_HELPERS */ 1469 1470#else 1471int fb_parse_edid(unsigned char *edid, struct fb_var_screeninfo *var) 1472{ 1473 return 1; 1474} 1475void fb_edid_to_monspecs(unsigned char *edid, struct fb_monspecs *specs) 1476{ 1477 specs = NULL; 1478} 1479void fb_edid_add_monspecs(unsigned char *edid, struct fb_monspecs *specs) 1480{ 1481} 1482void fb_destroy_modedb(struct fb_videomode *modedb) 1483{ 1484} 1485int fb_get_mode(int flags, u32 val, struct fb_var_screeninfo *var, 1486 struct fb_info *info) 1487{ 1488 return -EINVAL; 1489} 1490#endif /* CONFIG_FB_MODE_HELPERS */ 1491 1492/* 1493 * fb_validate_mode - validates var against monitor capabilities 1494 * @var: pointer to fb_var_screeninfo 1495 * @info: pointer to fb_info 1496 * 1497 * DESCRIPTION: 1498 * Validates video mode against monitor capabilities specified in 1499 * info->monspecs. 1500 * 1501 * REQUIRES: 1502 * A valid info->monspecs. 1503 */ 1504int fb_validate_mode(const struct fb_var_screeninfo *var, struct fb_info *info) 1505{ 1506 u32 hfreq, vfreq, htotal, vtotal, pixclock; 1507 u32 hfmin, hfmax, vfmin, vfmax, dclkmin, dclkmax; 1508 1509 /* 1510 * If monspecs are invalid, use values that are enough 1511 * for 640x480@60 1512 */ 1513 if (!info->monspecs.hfmax || !info->monspecs.vfmax || 1514 !info->monspecs.dclkmax || 1515 info->monspecs.hfmax < info->monspecs.hfmin || 1516 info->monspecs.vfmax < info->monspecs.vfmin || 1517 info->monspecs.dclkmax < info->monspecs.dclkmin) { 1518 hfmin = 29000; hfmax = 30000; 1519 vfmin = 60; vfmax = 60; 1520 dclkmin = 0; dclkmax = 25000000; 1521 } else { 1522 hfmin = info->monspecs.hfmin; 1523 hfmax = info->monspecs.hfmax; 1524 vfmin = info->monspecs.vfmin; 1525 vfmax = info->monspecs.vfmax; 1526 dclkmin = info->monspecs.dclkmin; 1527 dclkmax = info->monspecs.dclkmax; 1528 } 1529 1530 if (!var->pixclock) 1531 return -EINVAL; 1532 pixclock = PICOS2KHZ(var->pixclock) * 1000; 1533 1534 htotal = var->xres + var->right_margin + var->hsync_len + 1535 var->left_margin; 1536 vtotal = var->yres + var->lower_margin + var->vsync_len + 1537 var->upper_margin; 1538 1539 if (var->vmode & FB_VMODE_INTERLACED) 1540 vtotal /= 2; 1541 if (var->vmode & FB_VMODE_DOUBLE) 1542 vtotal *= 2; 1543 1544 hfreq = pixclock/htotal; 1545 hfreq = (hfreq + 500) / 1000 * 1000; 1546 1547 vfreq = hfreq/vtotal; 1548 1549 return (vfreq < vfmin || vfreq > vfmax || 1550 hfreq < hfmin || hfreq > hfmax || 1551 pixclock < dclkmin || pixclock > dclkmax) ? 1552 -EINVAL : 0; 1553} 1554 1555#if defined(CONFIG_FIRMWARE_EDID) && defined(CONFIG_X86) 1556 1557/* 1558 * We need to ensure that the EDID block is only returned for 1559 * the primary graphics adapter. 1560 */ 1561 1562const unsigned char *fb_firmware_edid(struct device *device) 1563{ 1564 struct pci_dev *dev = NULL; 1565 struct resource *res = NULL; 1566 unsigned char *edid = NULL; 1567 1568 if (device) 1569 dev = to_pci_dev(device); 1570 1571 if (dev) 1572 res = &dev->resource[PCI_ROM_RESOURCE]; 1573 1574 if (res && res->flags & IORESOURCE_ROM_SHADOW) 1575 edid = edid_info.dummy; 1576 1577 return edid; 1578} 1579#else 1580const unsigned char *fb_firmware_edid(struct device *device) 1581{ 1582 return NULL; 1583} 1584#endif 1585EXPORT_SYMBOL(fb_firmware_edid); 1586 1587EXPORT_SYMBOL(fb_parse_edid); 1588EXPORT_SYMBOL(fb_edid_to_monspecs); 1589EXPORT_SYMBOL(fb_edid_add_monspecs); 1590EXPORT_SYMBOL(fb_get_mode); 1591EXPORT_SYMBOL(fb_validate_mode); 1592EXPORT_SYMBOL(fb_destroy_modedb); 1593