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 #include "../edid.h" 37 38 /* 39 * EDID parser 40 */ 41 42 #undef DEBUG /* define this for verbose EDID parsing output */ 43 44 #ifdef DEBUG 45 #define DPRINTK(fmt, args...) printk(fmt,## args) 46 #else 47 #define DPRINTK(fmt, args...) 48 #endif 49 50 #define FBMON_FIX_HEADER 1 51 #define FBMON_FIX_INPUT 2 52 #define FBMON_FIX_TIMINGS 3 53 54 #ifdef CONFIG_FB_MODE_HELPERS 55 struct broken_edid { 56 u8 manufacturer[4]; 57 u32 model; 58 u32 fix; 59 }; 60 61 static const struct broken_edid brokendb[] = { 62 /* DEC FR-PCXAV-YZ */ 63 { 64 .manufacturer = "DEC", 65 .model = 0x073a, 66 .fix = FBMON_FIX_HEADER, 67 }, 68 /* ViewSonic PF775a */ 69 { 70 .manufacturer = "VSC", 71 .model = 0x5a44, 72 .fix = FBMON_FIX_INPUT, 73 }, 74 /* Sharp UXGA? */ 75 { 76 .manufacturer = "SHP", 77 .model = 0x138e, 78 .fix = FBMON_FIX_TIMINGS, 79 }, 80 }; 81 82 static const unsigned char edid_v1_header[] = { 0x00, 0xff, 0xff, 0xff, 83 0xff, 0xff, 0xff, 0x00 84 }; 85 86 static void copy_string(unsigned char *c, unsigned char *s) 87 { 88 int i; 89 c = c + 5; 90 for (i = 0; (i < 13 && *c != 0x0A); i++) 91 *(s++) = *(c++); 92 *s = 0; 93 while (i-- && (*--s == 0x20)) *s = 0; 94 } 95 96 static int edid_is_serial_block(unsigned char *block) 97 { 98 if ((block[0] == 0x00) && (block[1] == 0x00) && 99 (block[2] == 0x00) && (block[3] == 0xff) && 100 (block[4] == 0x00)) 101 return 1; 102 else 103 return 0; 104 } 105 106 static int edid_is_ascii_block(unsigned char *block) 107 { 108 if ((block[0] == 0x00) && (block[1] == 0x00) && 109 (block[2] == 0x00) && (block[3] == 0xfe) && 110 (block[4] == 0x00)) 111 return 1; 112 else 113 return 0; 114 } 115 116 static int edid_is_limits_block(unsigned char *block) 117 { 118 if ((block[0] == 0x00) && (block[1] == 0x00) && 119 (block[2] == 0x00) && (block[3] == 0xfd) && 120 (block[4] == 0x00)) 121 return 1; 122 else 123 return 0; 124 } 125 126 static int edid_is_monitor_block(unsigned char *block) 127 { 128 if ((block[0] == 0x00) && (block[1] == 0x00) && 129 (block[2] == 0x00) && (block[3] == 0xfc) && 130 (block[4] == 0x00)) 131 return 1; 132 else 133 return 0; 134 } 135 136 static int edid_is_timing_block(unsigned char *block) 137 { 138 if ((block[0] != 0x00) || (block[1] != 0x00) || 139 (block[2] != 0x00) || (block[4] != 0x00)) 140 return 1; 141 else 142 return 0; 143 } 144 145 static int check_edid(unsigned char *edid) 146 { 147 unsigned char *block = edid + ID_MANUFACTURER_NAME, manufacturer[4]; 148 unsigned char *b; 149 u32 model; 150 int i, fix = 0, ret = 0; 151 152 manufacturer[0] = ((block[0] & 0x7c) >> 2) + '@'; 153 manufacturer[1] = ((block[0] & 0x03) << 3) + 154 ((block[1] & 0xe0) >> 5) + '@'; 155 manufacturer[2] = (block[1] & 0x1f) + '@'; 156 manufacturer[3] = 0; 157 model = block[2] + (block[3] << 8); 158 159 for (i = 0; i < ARRAY_SIZE(brokendb); i++) { 160 if (!strncmp(manufacturer, brokendb[i].manufacturer, 4) && 161 brokendb[i].model == model) { 162 fix = brokendb[i].fix; 163 break; 164 } 165 } 166 167 switch (fix) { 168 case FBMON_FIX_HEADER: 169 for (i = 0; i < 8; i++) { 170 if (edid[i] != edid_v1_header[i]) { 171 ret = fix; 172 break; 173 } 174 } 175 break; 176 case FBMON_FIX_INPUT: 177 b = edid + EDID_STRUCT_DISPLAY; 178 /* Only if display is GTF capable will 179 the input type be reset to analog */ 180 if (b[4] & 0x01 && b[0] & 0x80) 181 ret = fix; 182 break; 183 case FBMON_FIX_TIMINGS: 184 b = edid + DETAILED_TIMING_DESCRIPTIONS_START; 185 ret = fix; 186 187 for (i = 0; i < 4; i++) { 188 if (edid_is_limits_block(b)) { 189 ret = 0; 190 break; 191 } 192 193 b += DETAILED_TIMING_DESCRIPTION_SIZE; 194 } 195 196 break; 197 } 198 199 if (ret) 200 printk("fbmon: The EDID Block of " 201 "Manufacturer: %s Model: 0x%x is known to " 202 "be broken,\n", manufacturer, model); 203 204 return ret; 205 } 206 207 static void fix_edid(unsigned char *edid, int fix) 208 { 209 int i; 210 unsigned char *b, csum = 0; 211 212 switch (fix) { 213 case FBMON_FIX_HEADER: 214 printk("fbmon: trying a header reconstruct\n"); 215 memcpy(edid, edid_v1_header, 8); 216 break; 217 case FBMON_FIX_INPUT: 218 printk("fbmon: trying to fix input type\n"); 219 b = edid + EDID_STRUCT_DISPLAY; 220 b[0] &= ~0x80; 221 edid[127] += 0x80; 222 break; 223 case FBMON_FIX_TIMINGS: 224 printk("fbmon: trying to fix monitor timings\n"); 225 b = edid + DETAILED_TIMING_DESCRIPTIONS_START; 226 for (i = 0; i < 4; i++) { 227 if (!(edid_is_serial_block(b) || 228 edid_is_ascii_block(b) || 229 edid_is_monitor_block(b) || 230 edid_is_timing_block(b))) { 231 b[0] = 0x00; 232 b[1] = 0x00; 233 b[2] = 0x00; 234 b[3] = 0xfd; 235 b[4] = 0x00; 236 b[5] = 60; /* vfmin */ 237 b[6] = 60; /* vfmax */ 238 b[7] = 30; /* hfmin */ 239 b[8] = 75; /* hfmax */ 240 b[9] = 17; /* pixclock - 170 MHz*/ 241 b[10] = 0; /* GTF */ 242 break; 243 } 244 245 b += DETAILED_TIMING_DESCRIPTION_SIZE; 246 } 247 248 for (i = 0; i < EDID_LENGTH - 1; i++) 249 csum += edid[i]; 250 251 edid[127] = 256 - csum; 252 break; 253 } 254 } 255 256 static int edid_checksum(unsigned char *edid) 257 { 258 unsigned char csum = 0, all_null = 0; 259 int i, err = 0, fix = check_edid(edid); 260 261 if (fix) 262 fix_edid(edid, fix); 263 264 for (i = 0; i < EDID_LENGTH; i++) { 265 csum += edid[i]; 266 all_null |= edid[i]; 267 } 268 269 if (csum == 0x00 && all_null) { 270 /* checksum passed, everything's good */ 271 err = 1; 272 } 273 274 return err; 275 } 276 277 static int edid_check_header(unsigned char *edid) 278 { 279 int i, err = 1, fix = check_edid(edid); 280 281 if (fix) 282 fix_edid(edid, fix); 283 284 for (i = 0; i < 8; i++) { 285 if (edid[i] != edid_v1_header[i]) 286 err = 0; 287 } 288 289 return err; 290 } 291 292 static void parse_vendor_block(unsigned char *block, struct fb_monspecs *specs) 293 { 294 specs->manufacturer[0] = ((block[0] & 0x7c) >> 2) + '@'; 295 specs->manufacturer[1] = ((block[0] & 0x03) << 3) + 296 ((block[1] & 0xe0) >> 5) + '@'; 297 specs->manufacturer[2] = (block[1] & 0x1f) + '@'; 298 specs->manufacturer[3] = 0; 299 specs->model = block[2] + (block[3] << 8); 300 specs->serial = block[4] + (block[5] << 8) + 301 (block[6] << 16) + (block[7] << 24); 302 specs->year = block[9] + 1990; 303 specs->week = block[8]; 304 DPRINTK(" Manufacturer: %s\n", specs->manufacturer); 305 DPRINTK(" Model: %x\n", specs->model); 306 DPRINTK(" Serial#: %u\n", specs->serial); 307 DPRINTK(" Year: %u Week %u\n", specs->year, specs->week); 308 } 309 310 static void get_dpms_capabilities(unsigned char flags, 311 struct fb_monspecs *specs) 312 { 313 specs->dpms = 0; 314 if (flags & DPMS_ACTIVE_OFF) 315 specs->dpms |= FB_DPMS_ACTIVE_OFF; 316 if (flags & DPMS_SUSPEND) 317 specs->dpms |= FB_DPMS_SUSPEND; 318 if (flags & DPMS_STANDBY) 319 specs->dpms |= FB_DPMS_STANDBY; 320 DPRINTK(" DPMS: Active %s, Suspend %s, Standby %s\n", 321 (flags & DPMS_ACTIVE_OFF) ? "yes" : "no", 322 (flags & DPMS_SUSPEND) ? "yes" : "no", 323 (flags & DPMS_STANDBY) ? "yes" : "no"); 324 } 325 326 static void get_chroma(unsigned char *block, struct fb_monspecs *specs) 327 { 328 int tmp; 329 330 DPRINTK(" Chroma\n"); 331 /* Chromaticity data */ 332 tmp = ((block[5] & (3 << 6)) >> 6) | (block[0x7] << 2); 333 tmp *= 1000; 334 tmp += 512; 335 specs->chroma.redx = tmp/1024; 336 DPRINTK(" RedX: 0.%03d ", specs->chroma.redx); 337 338 tmp = ((block[5] & (3 << 4)) >> 4) | (block[0x8] << 2); 339 tmp *= 1000; 340 tmp += 512; 341 specs->chroma.redy = tmp/1024; 342 DPRINTK("RedY: 0.%03d\n", specs->chroma.redy); 343 344 tmp = ((block[5] & (3 << 2)) >> 2) | (block[0x9] << 2); 345 tmp *= 1000; 346 tmp += 512; 347 specs->chroma.greenx = tmp/1024; 348 DPRINTK(" GreenX: 0.%03d ", specs->chroma.greenx); 349 350 tmp = (block[5] & 3) | (block[0xa] << 2); 351 tmp *= 1000; 352 tmp += 512; 353 specs->chroma.greeny = tmp/1024; 354 DPRINTK("GreenY: 0.%03d\n", specs->chroma.greeny); 355 356 tmp = ((block[6] & (3 << 6)) >> 6) | (block[0xb] << 2); 357 tmp *= 1000; 358 tmp += 512; 359 specs->chroma.bluex = tmp/1024; 360 DPRINTK(" BlueX: 0.%03d ", specs->chroma.bluex); 361 362 tmp = ((block[6] & (3 << 4)) >> 4) | (block[0xc] << 2); 363 tmp *= 1000; 364 tmp += 512; 365 specs->chroma.bluey = tmp/1024; 366 DPRINTK("BlueY: 0.%03d\n", specs->chroma.bluey); 367 368 tmp = ((block[6] & (3 << 2)) >> 2) | (block[0xd] << 2); 369 tmp *= 1000; 370 tmp += 512; 371 specs->chroma.whitex = tmp/1024; 372 DPRINTK(" WhiteX: 0.%03d ", specs->chroma.whitex); 373 374 tmp = (block[6] & 3) | (block[0xe] << 2); 375 tmp *= 1000; 376 tmp += 512; 377 specs->chroma.whitey = tmp/1024; 378 DPRINTK("WhiteY: 0.%03d\n", specs->chroma.whitey); 379 } 380 381 static void calc_mode_timings(int xres, int yres, int refresh, 382 struct fb_videomode *mode) 383 { 384 struct fb_var_screeninfo *var; 385 386 var = kzalloc(sizeof(struct fb_var_screeninfo), GFP_KERNEL); 387 388 if (var) { 389 var->xres = xres; 390 var->yres = yres; 391 fb_get_mode(FB_VSYNCTIMINGS | FB_IGNOREMON, 392 refresh, var, NULL); 393 mode->xres = xres; 394 mode->yres = yres; 395 mode->pixclock = var->pixclock; 396 mode->refresh = refresh; 397 mode->left_margin = var->left_margin; 398 mode->right_margin = var->right_margin; 399 mode->upper_margin = var->upper_margin; 400 mode->lower_margin = var->lower_margin; 401 mode->hsync_len = var->hsync_len; 402 mode->vsync_len = var->vsync_len; 403 mode->vmode = 0; 404 mode->sync = 0; 405 kfree(var); 406 } 407 } 408 409 static int get_est_timing(unsigned char *block, struct fb_videomode *mode) 410 { 411 int num = 0; 412 unsigned char c; 413 414 c = block[0]; 415 if (c&0x80) { 416 calc_mode_timings(720, 400, 70, &mode[num]); 417 mode[num++].flag = FB_MODE_IS_CALCULATED; 418 DPRINTK(" 720x400@70Hz\n"); 419 } 420 if (c&0x40) { 421 calc_mode_timings(720, 400, 88, &mode[num]); 422 mode[num++].flag = FB_MODE_IS_CALCULATED; 423 DPRINTK(" 720x400@88Hz\n"); 424 } 425 if (c&0x20) { 426 mode[num++] = vesa_modes[3]; 427 DPRINTK(" 640x480@60Hz\n"); 428 } 429 if (c&0x10) { 430 calc_mode_timings(640, 480, 67, &mode[num]); 431 mode[num++].flag = FB_MODE_IS_CALCULATED; 432 DPRINTK(" 640x480@67Hz\n"); 433 } 434 if (c&0x08) { 435 mode[num++] = vesa_modes[4]; 436 DPRINTK(" 640x480@72Hz\n"); 437 } 438 if (c&0x04) { 439 mode[num++] = vesa_modes[5]; 440 DPRINTK(" 640x480@75Hz\n"); 441 } 442 if (c&0x02) { 443 mode[num++] = vesa_modes[7]; 444 DPRINTK(" 800x600@56Hz\n"); 445 } 446 if (c&0x01) { 447 mode[num++] = vesa_modes[8]; 448 DPRINTK(" 800x600@60Hz\n"); 449 } 450 451 c = block[1]; 452 if (c&0x80) { 453 mode[num++] = vesa_modes[9]; 454 DPRINTK(" 800x600@72Hz\n"); 455 } 456 if (c&0x40) { 457 mode[num++] = vesa_modes[10]; 458 DPRINTK(" 800x600@75Hz\n"); 459 } 460 if (c&0x20) { 461 calc_mode_timings(832, 624, 75, &mode[num]); 462 mode[num++].flag = FB_MODE_IS_CALCULATED; 463 DPRINTK(" 832x624@75Hz\n"); 464 } 465 if (c&0x10) { 466 mode[num++] = vesa_modes[12]; 467 DPRINTK(" 1024x768@87Hz Interlaced\n"); 468 } 469 if (c&0x08) { 470 mode[num++] = vesa_modes[13]; 471 DPRINTK(" 1024x768@60Hz\n"); 472 } 473 if (c&0x04) { 474 mode[num++] = vesa_modes[14]; 475 DPRINTK(" 1024x768@70Hz\n"); 476 } 477 if (c&0x02) { 478 mode[num++] = vesa_modes[15]; 479 DPRINTK(" 1024x768@75Hz\n"); 480 } 481 if (c&0x01) { 482 mode[num++] = vesa_modes[21]; 483 DPRINTK(" 1280x1024@75Hz\n"); 484 } 485 c = block[2]; 486 if (c&0x80) { 487 mode[num++] = vesa_modes[17]; 488 DPRINTK(" 1152x870@75Hz\n"); 489 } 490 DPRINTK(" Manufacturer's mask: %x\n",c&0x7F); 491 return num; 492 } 493 494 static int get_std_timing(unsigned char *block, struct fb_videomode *mode, 495 int ver, int rev, const struct fb_monspecs *specs) 496 { 497 int i; 498 499 for (i = 0; i < DMT_SIZE; i++) { 500 u32 std_2byte_code = block[0] << 8 | block[1]; 501 if (std_2byte_code == dmt_modes[i].std_2byte_code) 502 break; 503 } 504 505 if (i < DMT_SIZE && dmt_modes[i].mode) { 506 /* DMT mode found */ 507 *mode = *dmt_modes[i].mode; 508 mode->flag |= FB_MODE_IS_STANDARD; 509 DPRINTK(" DMT id=%d\n", dmt_modes[i].dmt_id); 510 511 } else { 512 int xres, yres = 0, refresh, ratio; 513 514 xres = (block[0] + 31) * 8; 515 if (xres <= 256) 516 return 0; 517 518 ratio = (block[1] & 0xc0) >> 6; 519 switch (ratio) { 520 case 0: 521 /* in EDID 1.3 the meaning of 0 changed to 16:10 (prior 1:1) */ 522 if (ver < 1 || (ver == 1 && rev < 3)) 523 yres = xres; 524 else 525 yres = (xres * 10)/16; 526 break; 527 case 1: 528 yres = (xres * 3)/4; 529 break; 530 case 2: 531 yres = (xres * 4)/5; 532 break; 533 case 3: 534 yres = (xres * 9)/16; 535 break; 536 } 537 refresh = (block[1] & 0x3f) + 60; 538 DPRINTK(" %dx%d@%dHz\n", xres, yres, refresh); 539 540 calc_mode_timings(xres, yres, refresh, mode); 541 } 542 543 /* Check the mode we got is within valid spec of the monitor */ 544 if (specs && specs->dclkmax 545 && PICOS2KHZ(mode->pixclock) * 1000 > specs->dclkmax) { 546 DPRINTK(" mode exceed max DCLK\n"); 547 return 0; 548 } 549 550 return 1; 551 } 552 553 static int get_dst_timing(unsigned char *block, struct fb_videomode *mode, 554 int ver, int rev, const struct fb_monspecs *specs) 555 { 556 int j, num = 0; 557 558 for (j = 0; j < 6; j++, block += STD_TIMING_DESCRIPTION_SIZE) 559 num += get_std_timing(block, &mode[num], ver, rev, specs); 560 561 return num; 562 } 563 564 static void get_detailed_timing(unsigned char *block, 565 struct fb_videomode *mode) 566 { 567 mode->xres = H_ACTIVE; 568 mode->yres = V_ACTIVE; 569 mode->pixclock = PIXEL_CLOCK; 570 mode->pixclock /= 1000; 571 mode->pixclock = KHZ2PICOS(mode->pixclock); 572 mode->right_margin = H_SYNC_OFFSET; 573 mode->left_margin = (H_ACTIVE + H_BLANKING) - 574 (H_ACTIVE + H_SYNC_OFFSET + H_SYNC_WIDTH); 575 mode->upper_margin = V_BLANKING - V_SYNC_OFFSET - 576 V_SYNC_WIDTH; 577 mode->lower_margin = V_SYNC_OFFSET; 578 mode->hsync_len = H_SYNC_WIDTH; 579 mode->vsync_len = V_SYNC_WIDTH; 580 if (HSYNC_POSITIVE) 581 mode->sync |= FB_SYNC_HOR_HIGH_ACT; 582 if (VSYNC_POSITIVE) 583 mode->sync |= FB_SYNC_VERT_HIGH_ACT; 584 mode->refresh = PIXEL_CLOCK/((H_ACTIVE + H_BLANKING) * 585 (V_ACTIVE + V_BLANKING)); 586 if (INTERLACED) { 587 mode->yres *= 2; 588 mode->upper_margin *= 2; 589 mode->lower_margin *= 2; 590 mode->vsync_len *= 2; 591 mode->vmode |= FB_VMODE_INTERLACED; 592 } 593 mode->flag = FB_MODE_IS_DETAILED; 594 595 DPRINTK(" %d MHz ", PIXEL_CLOCK/1000000); 596 DPRINTK("%d %d %d %d ", H_ACTIVE, H_ACTIVE + H_SYNC_OFFSET, 597 H_ACTIVE + H_SYNC_OFFSET + H_SYNC_WIDTH, H_ACTIVE + H_BLANKING); 598 DPRINTK("%d %d %d %d ", V_ACTIVE, V_ACTIVE + V_SYNC_OFFSET, 599 V_ACTIVE + V_SYNC_OFFSET + V_SYNC_WIDTH, V_ACTIVE + V_BLANKING); 600 DPRINTK("%sHSync %sVSync\n\n", (HSYNC_POSITIVE) ? "+" : "-", 601 (VSYNC_POSITIVE) ? "+" : "-"); 602 } 603 604 /** 605 * fb_create_modedb - create video mode database 606 * @edid: EDID data 607 * @dbsize: database size 608 * 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 */ 615 static struct fb_videomode *fb_create_modedb(unsigned char *edid, int *dbsize, 616 const struct fb_monspecs *specs) 617 { 618 struct fb_videomode *mode, *m; 619 unsigned char *block; 620 int num = 0, i, first = 1; 621 int ver, rev; 622 623 mode = kcalloc(50, sizeof(struct fb_videomode), GFP_KERNEL); 624 if (mode == NULL) 625 return NULL; 626 627 if (edid == NULL || !edid_checksum(edid) || 628 !edid_check_header(edid)) { 629 kfree(mode); 630 return NULL; 631 } 632 633 ver = edid[EDID_STRUCT_VERSION]; 634 rev = edid[EDID_STRUCT_REVISION]; 635 636 *dbsize = 0; 637 638 DPRINTK(" Detailed Timings\n"); 639 block = edid + DETAILED_TIMING_DESCRIPTIONS_START; 640 for (i = 0; i < 4; i++, block+= DETAILED_TIMING_DESCRIPTION_SIZE) { 641 if (!(block[0] == 0x00 && block[1] == 0x00)) { 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 } 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) 658 num += get_std_timing(block, &mode[num], ver, rev, specs); 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) 663 num += get_dst_timing(block + 5, &mode[num], 664 ver, rev, specs); 665 } 666 667 /* Yikes, EDID data is totally useless */ 668 if (!num) { 669 kfree(mode); 670 return NULL; 671 } 672 673 *dbsize = num; 674 m = kmalloc_array(num, sizeof(struct fb_videomode), GFP_KERNEL); 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 */ 689 void fb_destroy_modedb(struct fb_videomode *modedb) 690 { 691 kfree(modedb); 692 } 693 694 static 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: "); 702 703 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 } 716 717 /* estimate monitor limits based on modes supported */ 718 if (retval) { 719 struct fb_videomode *modes, *mode; 720 int num_modes, hz, hscan, pixclock; 721 int vtotal, htotal; 722 723 modes = fb_create_modedb(edid, &num_modes, specs); 724 if (!modes) { 725 DPRINTK("None Available\n"); 726 return 1; 727 } 728 729 retval = 0; 730 for (i = 0; i < num_modes; i++) { 731 mode = &modes[i]; 732 pixclock = PICOS2KHZ(modes[i].pixclock) * 1000; 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; 747 748 if (specs->dclkmax == 0 || specs->dclkmax < pixclock) 749 specs->dclkmax = pixclock; 750 751 if (specs->dclkmin == 0 || specs->dclkmin > pixclock) 752 specs->dclkmin = pixclock; 753 754 if (specs->hfmax == 0 || specs->hfmax < hscan) 755 specs->hfmax = hscan; 756 757 if (specs->hfmin == 0 || specs->hfmin > hscan) 758 specs->hfmin = hscan; 759 760 if (specs->vfmax == 0 || specs->vfmax < hz) 761 specs->vfmax = hz; 762 763 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 } 774 775 static 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 } 892 893 int 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; 913 var->height = var->width = 0; 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 } 935 936 void fb_edid_to_monspecs(unsigned char *edid, struct fb_monspecs *specs) 937 { 938 unsigned char *block; 939 int i, found = 0; 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); 979 980 specs->modedb = fb_create_modedb(edid, &specs->modedb_len, specs); 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; 996 997 DPRINTK("========================================\n"); 998 } 999 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 */ 1005 void fb_edid_add_monspecs(unsigned char *edid, struct fb_monspecs *specs) 1006 { 1007 unsigned char *block; 1008 struct fb_videomode *m; 1009 int num = 0, i; 1010 u8 svd[64], edt[(128 - 4) / DETAILED_TIMING_DESCRIPTION_SIZE]; 1011 u8 pos = 4, svd_n = 0; 1012 1013 if (!edid) 1014 return; 1015 1016 if (!edid_checksum(edid)) 1017 return; 1018 1019 if (edid[0] != 0x2 || 1020 edid[2] < 4 || edid[2] > 128 - DETAILED_TIMING_DESCRIPTION_SIZE) 1021 return; 1022 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); 1028 if (type == 2) { 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 } 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 } 1042 pos += len + 1; 1043 } 1044 1045 block = edid + edid[2]; 1046 1047 DPRINTK(" Extended Detailed Timings\n"); 1048 1049 for (i = 0; i < (128 - edid[2]) / DETAILED_TIMING_DESCRIPTION_SIZE; 1050 i++, block += DETAILED_TIMING_DESCRIPTION_SIZE) 1051 if (PIXEL_CLOCK != 0) 1052 edt[num++] = block - edid; 1053 1054 /* Yikes, EDID data is totally useless */ 1055 if (!(num + svd_n)) 1056 return; 1057 1058 m = kcalloc(specs->modedb_len + num + svd_n, 1059 sizeof(struct fb_videomode), 1060 GFP_KERNEL); 1061 1062 if (!m) 1063 return; 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); 1072 } 1073 1074 for (i = specs->modedb_len + num; i < specs->modedb_len + num + svd_n; i++) { 1075 int idx = svd[i - specs->modedb_len - num]; 1076 if (!idx || idx >= ARRAY_SIZE(cea_modes)) { 1077 pr_warn("Reserved SVD code %d\n", idx); 1078 } else if (!cea_modes[idx].xres) { 1079 pr_warn("Unimplemented SVD code %d\n", idx); 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 1087 kfree(specs->modedb); 1088 specs->modedb = m; 1089 specs->modedb_len = specs->modedb_len + num + svd_n; 1090 } 1091 1092 /* 1093 * VESA Generalized Timing Formula (GTF) 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 1105 struct __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: 1122 * vblank = right_margin + vsync_len + left_margin 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 */ 1132 static u32 fb_get_vblank(u32 hfreq) 1133 { 1134 u32 vblank; 1135 1136 vblank = (hfreq * FLYBACK)/1000; 1137 vblank = (vblank + 500)/1000; 1138 return (vblank + V_FRONTPORCH); 1139 } 1140 1141 /** 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 1157 * 256 1158 * M = blank_scale * gradient 1159 * 1160 */ 1161 static u32 fb_get_hblank_by_hfreq(u32 hfreq, u32 xres) 1162 { 1163 u32 c_val, m_val, duty_cycle, hblank; 1164 1165 c_val = (((H_OFFSET - H_SCALEFACTOR) * H_BLANKSCALE)/256 + 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 1174 /** 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) 1187 * 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 */ 1195 static 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); 1203 h_period *= 10000; 1204 1205 h_period = int_sqrt(h_period); 1206 h_period -= (100 - C_VAL) * 100; 1207 h_period *= 1000; 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 } 1215 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) 1226 * 1227 */ 1228 1229 static u32 fb_get_hfreq(u32 vfreq, u32 yres) 1230 { 1231 u32 divisor, hfreq; 1232 1233 divisor = (1000000 - (vfreq * FLYBACK))/1000; 1234 hfreq = (yres + V_FRONTPORCH) * vfreq * 1000; 1235 return (hfreq/divisor); 1236 } 1237 1238 static 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; 1243 timings->hblank = fb_get_hblank_by_hfreq(timings->hfreq, 1244 timings->hactive); 1245 timings->htotal = timings->hactive + timings->hblank; 1246 timings->dclk = timings->htotal * timings->hfreq; 1247 } 1248 1249 static 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; 1254 timings->hblank = fb_get_hblank_by_hfreq(timings->hfreq, 1255 timings->hactive); 1256 timings->htotal = timings->hactive + timings->hblank; 1257 timings->dclk = timings->htotal * timings->hfreq; 1258 } 1259 1260 static void fb_timings_dclk(struct __fb_timings *timings) 1261 { 1262 timings->hblank = fb_get_hblank_by_dclk(timings->dclk, 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: 1282 * Calculates video mode based on monitor specs using VESA GTF. 1283 * The GTF is best for VESA GTF compliant monitors but is 1284 * specifically formulated to work for older monitors as well. 1285 * 1286 * If @flag==0, the function will attempt to maximize the 1287 * refresh rate. Otherwise, it will calculate timings based on 1288 * the flag and accompanying value. 1289 * 1290 * If FB_IGNOREMON bit is set in @flags, monitor specs will be 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). 1295 * 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. 1301 * 1302 * REQUIRES: 1303 * A valid info->monspecs, otherwise 'safe numbers' will be used. 1304 */ 1305 int fb_get_mode(int flags, u32 val, struct fb_var_screeninfo *var, struct fb_info *info) 1306 { 1307 struct __fb_timings *timings; 1308 u32 interlace = 1, dscan = 1; 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; 1316 1317 /* 1318 * If monspecs are invalid, use values that are enough 1319 * for 640x480@60 1320 */ 1321 if (!info || !info->monspecs.hfmax || !info->monspecs.vfmax || 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 1338 timings->hactive = var->xres; 1339 timings->vactive = var->yres; 1340 if (var->vmode & FB_VMODE_INTERLACED) { 1341 timings->vactive /= 2; 1342 interlace = 2; 1343 } 1344 if (var->vmode & FB_VMODE_DOUBLE) { 1345 timings->vactive *= 2; 1346 dscan = 2; 1347 } 1348 1349 switch (flags & ~FB_IGNOREMON) { 1350 case FB_MAXTIMINGS: /* maximize refresh rate */ 1351 timings->hfreq = hfmax; 1352 fb_timings_hfreq(timings); 1353 if (timings->vfreq > vfmax) { 1354 timings->vfreq = vfmax; 1355 fb_timings_vfreq(timings); 1356 } 1357 if (timings->dclk > dclkmax) { 1358 timings->dclk = dclkmax; 1359 fb_timings_dclk(timings); 1360 } 1361 break; 1362 case FB_VSYNCTIMINGS: /* vrefresh driven */ 1363 timings->vfreq = val; 1364 fb_timings_vfreq(timings); 1365 break; 1366 case FB_HSYNCTIMINGS: /* hsync driven */ 1367 timings->hfreq = val; 1368 fb_timings_hfreq(timings); 1369 break; 1370 case FB_DCLKTIMINGS: /* pixelclock driven */ 1371 timings->dclk = PICOS2KHZ(val) * 1000; 1372 fb_timings_dclk(timings); 1373 break; 1374 default: 1375 err = -EINVAL; 1376 1377 } 1378 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 } 1395 1396 kfree(timings); 1397 return err; 1398 } 1399 1400 #ifdef CONFIG_VIDEOMODE_HELPERS 1401 int 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; 1422 if (vm->flags & DISPLAY_FLAGS_HSYNC_HIGH) 1423 fbmode->sync |= FB_SYNC_HOR_HIGH_ACT; 1424 if (vm->flags & DISPLAY_FLAGS_VSYNC_HIGH) 1425 fbmode->sync |= FB_SYNC_VERT_HIGH_ACT; 1426 if (vm->flags & DISPLAY_FLAGS_INTERLACED) 1427 fbmode->vmode |= FB_VMODE_INTERLACED; 1428 if (vm->flags & DISPLAY_FLAGS_DOUBLESCAN) 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 } 1447 EXPORT_SYMBOL_GPL(fb_videomode_from_videomode); 1448 1449 #ifdef CONFIG_OF 1450 static 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 */ 1469 int 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 1479 ret = fb_videomode_from_videomode(&vm, fb); 1480 if (ret) 1481 return ret; 1482 1483 pr_debug("%pOF: got %dx%d display mode from %s\n", 1484 np, vm.hactive, vm.vactive, np->name); 1485 dump_fb_videomode(fb); 1486 1487 return 0; 1488 } 1489 EXPORT_SYMBOL_GPL(of_get_fb_videomode); 1490 #endif /* CONFIG_OF */ 1491 #endif /* CONFIG_VIDEOMODE_HELPERS */ 1492 1493 #else 1494 int fb_parse_edid(unsigned char *edid, struct fb_var_screeninfo *var) 1495 { 1496 return 1; 1497 } 1498 void fb_edid_to_monspecs(unsigned char *edid, struct fb_monspecs *specs) 1499 { 1500 } 1501 void fb_edid_add_monspecs(unsigned char *edid, struct fb_monspecs *specs) 1502 { 1503 } 1504 void fb_destroy_modedb(struct fb_videomode *modedb) 1505 { 1506 } 1507 int 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 */ 1513 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 */ 1526 int 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 1531 /* 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; 1555 1556 htotal = var->xres + var->right_margin + var->hsync_len + 1557 var->left_margin; 1558 vtotal = var->yres + var->lower_margin + var->vsync_len + 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; 1567 hfreq = (hfreq + 500) / 1000 * 1000; 1568 1569 vfreq = hfreq/vtotal; 1570 1571 return (vfreq < vfmin || vfreq > vfmax || 1572 hfreq < hfmin || hfreq > hfmax || 1573 pixclock < dclkmin || pixclock > dclkmax) ? 1574 -EINVAL : 0; 1575 } 1576 1577 #if defined(CONFIG_FIRMWARE_EDID) && defined(CONFIG_X86) 1578 1579 /* 1580 * We need to ensure that the EDID block is only returned for 1581 * the primary graphics adapter. 1582 */ 1583 1584 const 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 1602 const unsigned char *fb_firmware_edid(struct device *device) 1603 { 1604 return NULL; 1605 } 1606 #endif 1607 EXPORT_SYMBOL(fb_firmware_edid); 1608 1609 EXPORT_SYMBOL(fb_parse_edid); 1610 EXPORT_SYMBOL(fb_edid_to_monspecs); 1611 EXPORT_SYMBOL(fb_edid_add_monspecs); 1612 EXPORT_SYMBOL(fb_get_mode); 1613 EXPORT_SYMBOL(fb_validate_mode); 1614 EXPORT_SYMBOL(fb_destroy_modedb); 1615