1 /* 2 * linux/drivers/video/fbmon.c 3 * 4 * Copyright (C) 2002 James Simmons <jsimmons@users.sf.net> 5 * 6 * Credits: 7 * 8 * The EDID Parser is a conglomeration from the following sources: 9 * 10 * 1. SciTech SNAP Graphics Architecture 11 * Copyright (C) 1991-2002 SciTech Software, Inc. All rights reserved. 12 * 13 * 2. XFree86 4.3.0, interpret_edid.c 14 * Copyright 1998 by Egbert Eich <Egbert.Eich@Physik.TU-Darmstadt.DE> 15 * 16 * 3. John Fremlin <vii@users.sourceforge.net> and 17 * Ani Joshi <ajoshi@unixbox.com> 18 * 19 * Generalized Timing Formula is derived from: 20 * 21 * GTF Spreadsheet by Andy Morrish (1/5/97) 22 * available at https://www.vesa.org 23 * 24 * This file is subject to the terms and conditions of the GNU General Public 25 * License. See the file COPYING in the main directory of this archive 26 * for more details. 27 * 28 */ 29 #include <linux/fb.h> 30 #include <linux/module.h> 31 #include <linux/pci.h> 32 #include <linux/slab.h> 33 #include <video/edid.h> 34 #include <video/of_videomode.h> 35 #include <video/videomode.h> 36 #include "../edid.h" 37 38 /* 39 * EDID parser 40 */ 41 42 #undef DEBUG /* define this for verbose EDID parsing output */ 43 44 #ifdef DEBUG 45 #define DPRINTK(fmt, args...) printk(fmt,## args) 46 #else 47 #define DPRINTK(fmt, args...) no_printk(fmt, ##args) 48 #endif 49 50 #define FBMON_FIX_HEADER 1 51 #define FBMON_FIX_INPUT 2 52 #define FBMON_FIX_TIMINGS 3 53 54 #ifdef CONFIG_FB_MODE_HELPERS 55 struct broken_edid { 56 u8 manufacturer[4]; 57 u32 model; 58 u32 fix; 59 }; 60 61 static const struct broken_edid brokendb[] = { 62 /* DEC FR-PCXAV-YZ */ 63 { 64 .manufacturer = "DEC", 65 .model = 0x073a, 66 .fix = FBMON_FIX_HEADER, 67 }, 68 /* ViewSonic PF775a */ 69 { 70 .manufacturer = "VSC", 71 .model = 0x5a44, 72 .fix = FBMON_FIX_INPUT, 73 }, 74 /* Sharp UXGA? */ 75 { 76 .manufacturer = "SHP", 77 .model = 0x138e, 78 .fix = FBMON_FIX_TIMINGS, 79 }, 80 }; 81 82 static const unsigned char edid_v1_header[] = { 0x00, 0xff, 0xff, 0xff, 83 0xff, 0xff, 0xff, 0x00 84 }; 85 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 * @specs: monitor specifications, may be NULL 609 * 610 * RETURNS: struct fb_videomode, @dbsize contains length of database 611 * 612 * DESCRIPTION: 613 * This function builds a mode database using the contents of the EDID 614 * data 615 */ 616 static struct fb_videomode *fb_create_modedb(unsigned char *edid, int *dbsize, 617 const struct fb_monspecs *specs) 618 { 619 struct fb_videomode *mode, *m; 620 unsigned char *block; 621 int num = 0, i, first = 1; 622 int ver, rev; 623 624 mode = kcalloc(50, sizeof(struct fb_videomode), GFP_KERNEL); 625 if (mode == NULL) 626 return NULL; 627 628 if (edid == NULL || !edid_checksum(edid) || 629 !edid_check_header(edid)) { 630 kfree(mode); 631 return NULL; 632 } 633 634 ver = edid[EDID_STRUCT_VERSION]; 635 rev = edid[EDID_STRUCT_REVISION]; 636 637 *dbsize = 0; 638 639 DPRINTK(" Detailed Timings\n"); 640 block = edid + DETAILED_TIMING_DESCRIPTIONS_START; 641 for (i = 0; i < 4; i++, block+= DETAILED_TIMING_DESCRIPTION_SIZE) { 642 if (!(block[0] == 0x00 && block[1] == 0x00)) { 643 get_detailed_timing(block, &mode[num]); 644 if (first) { 645 mode[num].flag |= FB_MODE_IS_FIRST; 646 first = 0; 647 } 648 num++; 649 } 650 } 651 652 DPRINTK(" Supported VESA Modes\n"); 653 block = edid + ESTABLISHED_TIMING_1; 654 num += get_est_timing(block, &mode[num]); 655 656 DPRINTK(" Standard Timings\n"); 657 block = edid + STD_TIMING_DESCRIPTIONS_START; 658 for (i = 0; i < STD_TIMING; i++, block += STD_TIMING_DESCRIPTION_SIZE) 659 num += get_std_timing(block, &mode[num], ver, rev, specs); 660 661 block = edid + DETAILED_TIMING_DESCRIPTIONS_START; 662 for (i = 0; i < 4; i++, block+= DETAILED_TIMING_DESCRIPTION_SIZE) { 663 if (block[0] == 0x00 && block[1] == 0x00 && block[3] == 0xfa) 664 num += get_dst_timing(block + 5, &mode[num], 665 ver, rev, specs); 666 } 667 668 /* Yikes, EDID data is totally useless */ 669 if (!num) { 670 kfree(mode); 671 return NULL; 672 } 673 674 *dbsize = num; 675 m = kmalloc_array(num, sizeof(struct fb_videomode), GFP_KERNEL); 676 if (!m) 677 return mode; 678 memmove(m, mode, num * sizeof(struct fb_videomode)); 679 kfree(mode); 680 return m; 681 } 682 683 /** 684 * fb_destroy_modedb - destroys mode database 685 * @modedb: mode database to destroy 686 * 687 * DESCRIPTION: 688 * Destroy mode database created by fb_create_modedb 689 */ 690 void fb_destroy_modedb(struct fb_videomode *modedb) 691 { 692 kfree(modedb); 693 } 694 695 static int fb_get_monitor_limits(unsigned char *edid, struct fb_monspecs *specs) 696 { 697 int i, retval = 1; 698 unsigned char *block; 699 700 block = edid + DETAILED_TIMING_DESCRIPTIONS_START; 701 702 DPRINTK(" Monitor Operating Limits: "); 703 704 for (i = 0; i < 4; i++, block += DETAILED_TIMING_DESCRIPTION_SIZE) { 705 if (edid_is_limits_block(block)) { 706 specs->hfmin = H_MIN_RATE * 1000; 707 specs->hfmax = H_MAX_RATE * 1000; 708 specs->vfmin = V_MIN_RATE; 709 specs->vfmax = V_MAX_RATE; 710 specs->dclkmax = MAX_PIXEL_CLOCK * 1000000; 711 specs->gtf = (GTF_SUPPORT) ? 1 : 0; 712 retval = 0; 713 DPRINTK("From EDID\n"); 714 break; 715 } 716 } 717 718 /* estimate monitor limits based on modes supported */ 719 if (retval) { 720 struct fb_videomode *modes, *mode; 721 int num_modes, hz, hscan, pixclock; 722 int vtotal, htotal; 723 724 modes = fb_create_modedb(edid, &num_modes, specs); 725 if (!modes) { 726 DPRINTK("None Available\n"); 727 return 1; 728 } 729 730 retval = 0; 731 for (i = 0; i < num_modes; i++) { 732 mode = &modes[i]; 733 pixclock = PICOS2KHZ(modes[i].pixclock) * 1000; 734 htotal = mode->xres + mode->right_margin + mode->hsync_len 735 + mode->left_margin; 736 vtotal = mode->yres + mode->lower_margin + mode->vsync_len 737 + mode->upper_margin; 738 739 if (mode->vmode & FB_VMODE_INTERLACED) 740 vtotal /= 2; 741 742 if (mode->vmode & FB_VMODE_DOUBLE) 743 vtotal *= 2; 744 745 hscan = (pixclock + htotal / 2) / htotal; 746 hscan = (hscan + 500) / 1000 * 1000; 747 hz = (hscan + vtotal / 2) / vtotal; 748 749 if (specs->dclkmax == 0 || specs->dclkmax < pixclock) 750 specs->dclkmax = pixclock; 751 752 if (specs->dclkmin == 0 || specs->dclkmin > pixclock) 753 specs->dclkmin = pixclock; 754 755 if (specs->hfmax == 0 || specs->hfmax < hscan) 756 specs->hfmax = hscan; 757 758 if (specs->hfmin == 0 || specs->hfmin > hscan) 759 specs->hfmin = hscan; 760 761 if (specs->vfmax == 0 || specs->vfmax < hz) 762 specs->vfmax = hz; 763 764 if (specs->vfmin == 0 || specs->vfmin > hz) 765 specs->vfmin = hz; 766 } 767 DPRINTK("Extrapolated\n"); 768 fb_destroy_modedb(modes); 769 } 770 DPRINTK(" H: %d-%dKHz V: %d-%dHz DCLK: %dMHz\n", 771 specs->hfmin/1000, specs->hfmax/1000, specs->vfmin, 772 specs->vfmax, specs->dclkmax/1000000); 773 return retval; 774 } 775 776 static void get_monspecs(unsigned char *edid, struct fb_monspecs *specs) 777 { 778 unsigned char c, *block; 779 780 block = edid + EDID_STRUCT_DISPLAY; 781 782 fb_get_monitor_limits(edid, specs); 783 784 c = block[0] & 0x80; 785 specs->input = 0; 786 if (c) { 787 specs->input |= FB_DISP_DDI; 788 DPRINTK(" Digital Display Input"); 789 } else { 790 DPRINTK(" Analog Display Input: Input Voltage - "); 791 switch ((block[0] & 0x60) >> 5) { 792 case 0: 793 DPRINTK("0.700V/0.300V"); 794 specs->input |= FB_DISP_ANA_700_300; 795 break; 796 case 1: 797 DPRINTK("0.714V/0.286V"); 798 specs->input |= FB_DISP_ANA_714_286; 799 break; 800 case 2: 801 DPRINTK("1.000V/0.400V"); 802 specs->input |= FB_DISP_ANA_1000_400; 803 break; 804 case 3: 805 DPRINTK("0.700V/0.000V"); 806 specs->input |= FB_DISP_ANA_700_000; 807 break; 808 } 809 } 810 DPRINTK("\n Sync: "); 811 c = block[0] & 0x10; 812 if (c) 813 DPRINTK(" Configurable signal level\n"); 814 c = block[0] & 0x0f; 815 specs->signal = 0; 816 if (c & 0x10) { 817 DPRINTK("Blank to Blank "); 818 specs->signal |= FB_SIGNAL_BLANK_BLANK; 819 } 820 if (c & 0x08) { 821 DPRINTK("Separate "); 822 specs->signal |= FB_SIGNAL_SEPARATE; 823 } 824 if (c & 0x04) { 825 DPRINTK("Composite "); 826 specs->signal |= FB_SIGNAL_COMPOSITE; 827 } 828 if (c & 0x02) { 829 DPRINTK("Sync on Green "); 830 specs->signal |= FB_SIGNAL_SYNC_ON_GREEN; 831 } 832 if (c & 0x01) { 833 DPRINTK("Serration on "); 834 specs->signal |= FB_SIGNAL_SERRATION_ON; 835 } 836 DPRINTK("\n"); 837 specs->max_x = block[1]; 838 specs->max_y = block[2]; 839 DPRINTK(" Max H-size in cm: "); 840 if (specs->max_x) 841 DPRINTK("%d\n", specs->max_x); 842 else 843 DPRINTK("variable\n"); 844 DPRINTK(" Max V-size in cm: "); 845 if (specs->max_y) 846 DPRINTK("%d\n", specs->max_y); 847 else 848 DPRINTK("variable\n"); 849 850 c = block[3]; 851 specs->gamma = c+100; 852 DPRINTK(" Gamma: "); 853 DPRINTK("%d.%d\n", specs->gamma/100, specs->gamma % 100); 854 855 get_dpms_capabilities(block[4], specs); 856 857 switch ((block[4] & 0x18) >> 3) { 858 case 0: 859 DPRINTK(" Monochrome/Grayscale\n"); 860 specs->input |= FB_DISP_MONO; 861 break; 862 case 1: 863 DPRINTK(" RGB Color Display\n"); 864 specs->input |= FB_DISP_RGB; 865 break; 866 case 2: 867 DPRINTK(" Non-RGB Multicolor Display\n"); 868 specs->input |= FB_DISP_MULTI; 869 break; 870 default: 871 DPRINTK(" Unknown\n"); 872 specs->input |= FB_DISP_UNKNOWN; 873 break; 874 } 875 876 get_chroma(block, specs); 877 878 specs->misc = 0; 879 c = block[4] & 0x7; 880 if (c & 0x04) { 881 DPRINTK(" Default color format is primary\n"); 882 specs->misc |= FB_MISC_PRIM_COLOR; 883 } 884 if (c & 0x02) { 885 DPRINTK(" First DETAILED Timing is preferred\n"); 886 specs->misc |= FB_MISC_1ST_DETAIL; 887 } 888 if (c & 0x01) { 889 printk(" Display is GTF capable\n"); 890 specs->gtf = 1; 891 } 892 } 893 894 int fb_parse_edid(unsigned char *edid, struct fb_var_screeninfo *var) 895 { 896 int i; 897 unsigned char *block; 898 899 if (edid == NULL || var == NULL) 900 return 1; 901 902 if (!(edid_checksum(edid))) 903 return 1; 904 905 if (!(edid_check_header(edid))) 906 return 1; 907 908 block = edid + DETAILED_TIMING_DESCRIPTIONS_START; 909 910 for (i = 0; i < 4; i++, block += DETAILED_TIMING_DESCRIPTION_SIZE) { 911 if (edid_is_timing_block(block)) { 912 var->xres = var->xres_virtual = H_ACTIVE; 913 var->yres = var->yres_virtual = V_ACTIVE; 914 var->height = var->width = 0; 915 var->right_margin = H_SYNC_OFFSET; 916 var->left_margin = (H_ACTIVE + H_BLANKING) - 917 (H_ACTIVE + H_SYNC_OFFSET + H_SYNC_WIDTH); 918 var->upper_margin = V_BLANKING - V_SYNC_OFFSET - 919 V_SYNC_WIDTH; 920 var->lower_margin = V_SYNC_OFFSET; 921 var->hsync_len = H_SYNC_WIDTH; 922 var->vsync_len = V_SYNC_WIDTH; 923 var->pixclock = PIXEL_CLOCK; 924 var->pixclock /= 1000; 925 var->pixclock = KHZ2PICOS(var->pixclock); 926 927 if (HSYNC_POSITIVE) 928 var->sync |= FB_SYNC_HOR_HIGH_ACT; 929 if (VSYNC_POSITIVE) 930 var->sync |= FB_SYNC_VERT_HIGH_ACT; 931 return 0; 932 } 933 } 934 return 1; 935 } 936 937 void fb_edid_to_monspecs(unsigned char *edid, struct fb_monspecs *specs) 938 { 939 unsigned char *block; 940 int i, found = 0; 941 942 if (edid == NULL) 943 return; 944 945 if (!(edid_checksum(edid))) 946 return; 947 948 if (!(edid_check_header(edid))) 949 return; 950 951 memset(specs, 0, sizeof(struct fb_monspecs)); 952 953 specs->version = edid[EDID_STRUCT_VERSION]; 954 specs->revision = edid[EDID_STRUCT_REVISION]; 955 956 DPRINTK("========================================\n"); 957 DPRINTK("Display Information (EDID)\n"); 958 DPRINTK("========================================\n"); 959 DPRINTK(" EDID Version %d.%d\n", (int) specs->version, 960 (int) specs->revision); 961 962 parse_vendor_block(edid + ID_MANUFACTURER_NAME, specs); 963 964 block = edid + DETAILED_TIMING_DESCRIPTIONS_START; 965 for (i = 0; i < 4; i++, block += DETAILED_TIMING_DESCRIPTION_SIZE) { 966 if (edid_is_serial_block(block)) { 967 copy_string(block, specs->serial_no); 968 DPRINTK(" Serial Number: %s\n", specs->serial_no); 969 } else if (edid_is_ascii_block(block)) { 970 copy_string(block, specs->ascii); 971 DPRINTK(" ASCII Block: %s\n", specs->ascii); 972 } else if (edid_is_monitor_block(block)) { 973 copy_string(block, specs->monitor); 974 DPRINTK(" Monitor Name: %s\n", specs->monitor); 975 } 976 } 977 978 DPRINTK(" Display Characteristics:\n"); 979 get_monspecs(edid, specs); 980 981 specs->modedb = fb_create_modedb(edid, &specs->modedb_len, specs); 982 if (!specs->modedb) 983 return; 984 985 /* 986 * Workaround for buggy EDIDs that sets that the first 987 * detailed timing is preferred but has not detailed 988 * timing specified 989 */ 990 for (i = 0; i < specs->modedb_len; i++) { 991 if (specs->modedb[i].flag & FB_MODE_IS_DETAILED) { 992 found = 1; 993 break; 994 } 995 } 996 997 if (!found) 998 specs->misc &= ~FB_MISC_1ST_DETAIL; 999 1000 DPRINTK("========================================\n"); 1001 } 1002 1003 /* 1004 * VESA Generalized Timing Formula (GTF) 1005 */ 1006 1007 #define FLYBACK 550 1008 #define V_FRONTPORCH 1 1009 #define H_OFFSET 40 1010 #define H_SCALEFACTOR 20 1011 #define H_BLANKSCALE 128 1012 #define H_GRADIENT 600 1013 #define C_VAL 30 1014 #define M_VAL 300 1015 1016 struct __fb_timings { 1017 u32 dclk; 1018 u32 hfreq; 1019 u32 vfreq; 1020 u32 hactive; 1021 u32 vactive; 1022 u32 hblank; 1023 u32 vblank; 1024 u32 htotal; 1025 u32 vtotal; 1026 }; 1027 1028 /** 1029 * fb_get_vblank - get vertical blank time 1030 * @hfreq: horizontal freq 1031 * 1032 * DESCRIPTION: 1033 * vblank = right_margin + vsync_len + left_margin 1034 * 1035 * given: right_margin = 1 (V_FRONTPORCH) 1036 * vsync_len = 3 1037 * flyback = 550 1038 * 1039 * flyback * hfreq 1040 * left_margin = --------------- - vsync_len 1041 * 1000000 1042 */ 1043 static u32 fb_get_vblank(u32 hfreq) 1044 { 1045 u32 vblank; 1046 1047 vblank = (hfreq * FLYBACK)/1000; 1048 vblank = (vblank + 500)/1000; 1049 return (vblank + V_FRONTPORCH); 1050 } 1051 1052 /** 1053 * fb_get_hblank_by_freq - get horizontal blank time given hfreq 1054 * @hfreq: horizontal freq 1055 * @xres: horizontal resolution in pixels 1056 * 1057 * DESCRIPTION: 1058 * 1059 * xres * duty_cycle 1060 * hblank = ------------------ 1061 * 100 - duty_cycle 1062 * 1063 * duty cycle = percent of htotal assigned to inactive display 1064 * duty cycle = C - (M/Hfreq) 1065 * 1066 * where: C = ((offset - scale factor) * blank_scale) 1067 * -------------------------------------- + scale factor 1068 * 256 1069 * M = blank_scale * gradient 1070 * 1071 */ 1072 static u32 fb_get_hblank_by_hfreq(u32 hfreq, u32 xres) 1073 { 1074 u32 c_val, m_val, duty_cycle, hblank; 1075 1076 c_val = (((H_OFFSET - H_SCALEFACTOR) * H_BLANKSCALE)/256 + 1077 H_SCALEFACTOR) * 1000; 1078 m_val = (H_BLANKSCALE * H_GRADIENT)/256; 1079 m_val = (m_val * 1000000)/hfreq; 1080 duty_cycle = c_val - m_val; 1081 hblank = (xres * duty_cycle)/(100000 - duty_cycle); 1082 return (hblank); 1083 } 1084 1085 /** 1086 * fb_get_hblank_by_dclk - get horizontal blank time given pixelclock 1087 * @dclk: pixelclock in Hz 1088 * @xres: horizontal resolution in pixels 1089 * 1090 * DESCRIPTION: 1091 * 1092 * xres * duty_cycle 1093 * hblank = ------------------ 1094 * 100 - duty_cycle 1095 * 1096 * duty cycle = percent of htotal assigned to inactive display 1097 * duty cycle = C - (M * h_period) 1098 * 1099 * where: h_period = SQRT(100 - C + (0.4 * xres * M)/dclk) + C - 100 1100 * ----------------------------------------------- 1101 * 2 * M 1102 * M = 300; 1103 * C = 30; 1104 */ 1105 static u32 fb_get_hblank_by_dclk(u32 dclk, u32 xres) 1106 { 1107 u32 duty_cycle, h_period, hblank; 1108 1109 dclk /= 1000; 1110 h_period = 100 - C_VAL; 1111 h_period *= h_period; 1112 h_period += (M_VAL * xres * 2 * 1000)/(5 * dclk); 1113 h_period *= 10000; 1114 1115 h_period = int_sqrt(h_period); 1116 h_period -= (100 - C_VAL) * 100; 1117 h_period *= 1000; 1118 h_period /= 2 * M_VAL; 1119 1120 duty_cycle = C_VAL * 1000 - (M_VAL * h_period)/100; 1121 hblank = (xres * duty_cycle)/(100000 - duty_cycle) + 8; 1122 hblank &= ~15; 1123 return (hblank); 1124 } 1125 1126 /** 1127 * fb_get_hfreq - estimate hsync 1128 * @vfreq: vertical refresh rate 1129 * @yres: vertical resolution 1130 * 1131 * DESCRIPTION: 1132 * 1133 * (yres + front_port) * vfreq * 1000000 1134 * hfreq = ------------------------------------- 1135 * (1000000 - (vfreq * FLYBACK) 1136 * 1137 */ 1138 1139 static u32 fb_get_hfreq(u32 vfreq, u32 yres) 1140 { 1141 u32 divisor, hfreq; 1142 1143 divisor = (1000000 - (vfreq * FLYBACK))/1000; 1144 hfreq = (yres + V_FRONTPORCH) * vfreq * 1000; 1145 return (hfreq/divisor); 1146 } 1147 1148 static void fb_timings_vfreq(struct __fb_timings *timings) 1149 { 1150 timings->hfreq = fb_get_hfreq(timings->vfreq, timings->vactive); 1151 timings->vblank = fb_get_vblank(timings->hfreq); 1152 timings->vtotal = timings->vactive + timings->vblank; 1153 timings->hblank = fb_get_hblank_by_hfreq(timings->hfreq, 1154 timings->hactive); 1155 timings->htotal = timings->hactive + timings->hblank; 1156 timings->dclk = timings->htotal * timings->hfreq; 1157 } 1158 1159 static void fb_timings_hfreq(struct __fb_timings *timings) 1160 { 1161 timings->vblank = fb_get_vblank(timings->hfreq); 1162 timings->vtotal = timings->vactive + timings->vblank; 1163 timings->vfreq = timings->hfreq/timings->vtotal; 1164 timings->hblank = fb_get_hblank_by_hfreq(timings->hfreq, 1165 timings->hactive); 1166 timings->htotal = timings->hactive + timings->hblank; 1167 timings->dclk = timings->htotal * timings->hfreq; 1168 } 1169 1170 static void fb_timings_dclk(struct __fb_timings *timings) 1171 { 1172 timings->hblank = fb_get_hblank_by_dclk(timings->dclk, 1173 timings->hactive); 1174 timings->htotal = timings->hactive + timings->hblank; 1175 timings->hfreq = timings->dclk/timings->htotal; 1176 timings->vblank = fb_get_vblank(timings->hfreq); 1177 timings->vtotal = timings->vactive + timings->vblank; 1178 timings->vfreq = timings->hfreq/timings->vtotal; 1179 } 1180 1181 /* 1182 * fb_get_mode - calculates video mode using VESA GTF 1183 * @flags: if: 0 - maximize vertical refresh rate 1184 * 1 - vrefresh-driven calculation; 1185 * 2 - hscan-driven calculation; 1186 * 3 - pixelclock-driven calculation; 1187 * @val: depending on @flags, ignored, vrefresh, hsync or pixelclock 1188 * @var: pointer to fb_var_screeninfo 1189 * @info: pointer to fb_info 1190 * 1191 * DESCRIPTION: 1192 * Calculates video mode based on monitor specs using VESA GTF. 1193 * The GTF is best for VESA GTF compliant monitors but is 1194 * specifically formulated to work for older monitors as well. 1195 * 1196 * If @flag==0, the function will attempt to maximize the 1197 * refresh rate. Otherwise, it will calculate timings based on 1198 * the flag and accompanying value. 1199 * 1200 * If FB_IGNOREMON bit is set in @flags, monitor specs will be 1201 * ignored and @var will be filled with the calculated timings. 1202 * 1203 * All calculations are based on the VESA GTF Spreadsheet 1204 * available at VESA's public ftp (https://www.vesa.org). 1205 * 1206 * NOTES: 1207 * The timings generated by the GTF will be different from VESA 1208 * DMT. It might be a good idea to keep a table of standard 1209 * VESA modes as well. The GTF may also not work for some displays, 1210 * such as, and especially, analog TV. 1211 * 1212 * REQUIRES: 1213 * A valid info->monspecs, otherwise 'safe numbers' will be used. 1214 */ 1215 int fb_get_mode(int flags, u32 val, struct fb_var_screeninfo *var, struct fb_info *info) 1216 { 1217 struct __fb_timings *timings; 1218 u32 interlace = 1, dscan = 1; 1219 u32 hfmin, hfmax, vfmin, vfmax, dclkmin, dclkmax, err = 0; 1220 1221 1222 timings = kzalloc(sizeof(struct __fb_timings), GFP_KERNEL); 1223 1224 if (!timings) 1225 return -ENOMEM; 1226 1227 /* 1228 * If monspecs are invalid, use values that are enough 1229 * for 640x480@60 1230 */ 1231 if (!info || !info->monspecs.hfmax || !info->monspecs.vfmax || 1232 !info->monspecs.dclkmax || 1233 info->monspecs.hfmax < info->monspecs.hfmin || 1234 info->monspecs.vfmax < info->monspecs.vfmin || 1235 info->monspecs.dclkmax < info->monspecs.dclkmin) { 1236 hfmin = 29000; hfmax = 30000; 1237 vfmin = 60; vfmax = 60; 1238 dclkmin = 0; dclkmax = 25000000; 1239 } else { 1240 hfmin = info->monspecs.hfmin; 1241 hfmax = info->monspecs.hfmax; 1242 vfmin = info->monspecs.vfmin; 1243 vfmax = info->monspecs.vfmax; 1244 dclkmin = info->monspecs.dclkmin; 1245 dclkmax = info->monspecs.dclkmax; 1246 } 1247 1248 timings->hactive = var->xres; 1249 timings->vactive = var->yres; 1250 if (var->vmode & FB_VMODE_INTERLACED) { 1251 timings->vactive /= 2; 1252 interlace = 2; 1253 } 1254 if (var->vmode & FB_VMODE_DOUBLE) { 1255 timings->vactive *= 2; 1256 dscan = 2; 1257 } 1258 1259 switch (flags & ~FB_IGNOREMON) { 1260 case FB_MAXTIMINGS: /* maximize refresh rate */ 1261 timings->hfreq = hfmax; 1262 fb_timings_hfreq(timings); 1263 if (timings->vfreq > vfmax) { 1264 timings->vfreq = vfmax; 1265 fb_timings_vfreq(timings); 1266 } 1267 if (timings->dclk > dclkmax) { 1268 timings->dclk = dclkmax; 1269 fb_timings_dclk(timings); 1270 } 1271 break; 1272 case FB_VSYNCTIMINGS: /* vrefresh driven */ 1273 timings->vfreq = val; 1274 fb_timings_vfreq(timings); 1275 break; 1276 case FB_HSYNCTIMINGS: /* hsync driven */ 1277 timings->hfreq = val; 1278 fb_timings_hfreq(timings); 1279 break; 1280 case FB_DCLKTIMINGS: /* pixelclock driven */ 1281 timings->dclk = PICOS2KHZ(val) * 1000; 1282 fb_timings_dclk(timings); 1283 break; 1284 default: 1285 err = -EINVAL; 1286 1287 } 1288 1289 if (err || (!(flags & FB_IGNOREMON) && 1290 (timings->vfreq < vfmin || timings->vfreq > vfmax || 1291 timings->hfreq < hfmin || timings->hfreq > hfmax || 1292 timings->dclk < dclkmin || timings->dclk > dclkmax))) { 1293 err = -EINVAL; 1294 } else { 1295 var->pixclock = KHZ2PICOS(timings->dclk/1000); 1296 var->hsync_len = (timings->htotal * 8)/100; 1297 var->right_margin = (timings->hblank/2) - var->hsync_len; 1298 var->left_margin = timings->hblank - var->right_margin - 1299 var->hsync_len; 1300 var->vsync_len = (3 * interlace)/dscan; 1301 var->lower_margin = (1 * interlace)/dscan; 1302 var->upper_margin = (timings->vblank * interlace)/dscan - 1303 (var->vsync_len + var->lower_margin); 1304 } 1305 1306 kfree(timings); 1307 return err; 1308 } 1309 1310 #ifdef CONFIG_VIDEOMODE_HELPERS 1311 int fb_videomode_from_videomode(const struct videomode *vm, 1312 struct fb_videomode *fbmode) 1313 { 1314 unsigned int htotal, vtotal; 1315 1316 fbmode->xres = vm->hactive; 1317 fbmode->left_margin = vm->hback_porch; 1318 fbmode->right_margin = vm->hfront_porch; 1319 fbmode->hsync_len = vm->hsync_len; 1320 1321 fbmode->yres = vm->vactive; 1322 fbmode->upper_margin = vm->vback_porch; 1323 fbmode->lower_margin = vm->vfront_porch; 1324 fbmode->vsync_len = vm->vsync_len; 1325 1326 /* prevent division by zero in KHZ2PICOS macro */ 1327 fbmode->pixclock = vm->pixelclock ? 1328 KHZ2PICOS(vm->pixelclock / 1000) : 0; 1329 1330 fbmode->sync = 0; 1331 fbmode->vmode = 0; 1332 if (vm->flags & DISPLAY_FLAGS_HSYNC_HIGH) 1333 fbmode->sync |= FB_SYNC_HOR_HIGH_ACT; 1334 if (vm->flags & DISPLAY_FLAGS_VSYNC_HIGH) 1335 fbmode->sync |= FB_SYNC_VERT_HIGH_ACT; 1336 if (vm->flags & DISPLAY_FLAGS_INTERLACED) 1337 fbmode->vmode |= FB_VMODE_INTERLACED; 1338 if (vm->flags & DISPLAY_FLAGS_DOUBLESCAN) 1339 fbmode->vmode |= FB_VMODE_DOUBLE; 1340 fbmode->flag = 0; 1341 1342 htotal = vm->hactive + vm->hfront_porch + vm->hback_porch + 1343 vm->hsync_len; 1344 vtotal = vm->vactive + vm->vfront_porch + vm->vback_porch + 1345 vm->vsync_len; 1346 /* prevent division by zero */ 1347 if (htotal && vtotal) { 1348 fbmode->refresh = vm->pixelclock / (htotal * vtotal); 1349 /* a mode must have htotal and vtotal != 0 or it is invalid */ 1350 } else { 1351 fbmode->refresh = 0; 1352 return -EINVAL; 1353 } 1354 1355 return 0; 1356 } 1357 EXPORT_SYMBOL_GPL(fb_videomode_from_videomode); 1358 1359 #ifdef CONFIG_OF 1360 static inline void dump_fb_videomode(const struct fb_videomode *m) 1361 { 1362 pr_debug("fb_videomode = %ux%u@%uHz (%ukHz) %u %u %u %u %u %u %u %u %u\n", 1363 m->xres, m->yres, m->refresh, m->pixclock, m->left_margin, 1364 m->right_margin, m->upper_margin, m->lower_margin, 1365 m->hsync_len, m->vsync_len, m->sync, m->vmode, m->flag); 1366 } 1367 1368 /** 1369 * of_get_fb_videomode - get a fb_videomode from devicetree 1370 * @np: device_node with the timing specification 1371 * @fb: will be set to the return value 1372 * @index: index into the list of display timings in devicetree 1373 * 1374 * DESCRIPTION: 1375 * This function is expensive and should only be used, if only one mode is to be 1376 * read from DT. To get multiple modes start with of_get_display_timings ond 1377 * work with that instead. 1378 */ 1379 int of_get_fb_videomode(struct device_node *np, struct fb_videomode *fb, 1380 int index) 1381 { 1382 struct videomode vm; 1383 int ret; 1384 1385 ret = of_get_videomode(np, &vm, index); 1386 if (ret) 1387 return ret; 1388 1389 ret = fb_videomode_from_videomode(&vm, fb); 1390 if (ret) 1391 return ret; 1392 1393 pr_debug("%pOF: got %dx%d display mode\n", 1394 np, vm.hactive, vm.vactive); 1395 dump_fb_videomode(fb); 1396 1397 return 0; 1398 } 1399 EXPORT_SYMBOL_GPL(of_get_fb_videomode); 1400 #endif /* CONFIG_OF */ 1401 #endif /* CONFIG_VIDEOMODE_HELPERS */ 1402 1403 #else 1404 int fb_parse_edid(unsigned char *edid, struct fb_var_screeninfo *var) 1405 { 1406 return 1; 1407 } 1408 void fb_edid_to_monspecs(unsigned char *edid, struct fb_monspecs *specs) 1409 { 1410 } 1411 void fb_destroy_modedb(struct fb_videomode *modedb) 1412 { 1413 } 1414 int fb_get_mode(int flags, u32 val, struct fb_var_screeninfo *var, 1415 struct fb_info *info) 1416 { 1417 return -EINVAL; 1418 } 1419 #endif /* CONFIG_FB_MODE_HELPERS */ 1420 1421 /* 1422 * fb_validate_mode - validates var against monitor capabilities 1423 * @var: pointer to fb_var_screeninfo 1424 * @info: pointer to fb_info 1425 * 1426 * DESCRIPTION: 1427 * Validates video mode against monitor capabilities specified in 1428 * info->monspecs. 1429 * 1430 * REQUIRES: 1431 * A valid info->monspecs. 1432 */ 1433 int fb_validate_mode(const struct fb_var_screeninfo *var, struct fb_info *info) 1434 { 1435 u32 hfreq, vfreq, htotal, vtotal, pixclock; 1436 u32 hfmin, hfmax, vfmin, vfmax, dclkmin, dclkmax; 1437 1438 /* 1439 * If monspecs are invalid, use values that are enough 1440 * for 640x480@60 1441 */ 1442 if (!info->monspecs.hfmax || !info->monspecs.vfmax || 1443 !info->monspecs.dclkmax || 1444 info->monspecs.hfmax < info->monspecs.hfmin || 1445 info->monspecs.vfmax < info->monspecs.vfmin || 1446 info->monspecs.dclkmax < info->monspecs.dclkmin) { 1447 hfmin = 29000; hfmax = 30000; 1448 vfmin = 60; vfmax = 60; 1449 dclkmin = 0; dclkmax = 25000000; 1450 } else { 1451 hfmin = info->monspecs.hfmin; 1452 hfmax = info->monspecs.hfmax; 1453 vfmin = info->monspecs.vfmin; 1454 vfmax = info->monspecs.vfmax; 1455 dclkmin = info->monspecs.dclkmin; 1456 dclkmax = info->monspecs.dclkmax; 1457 } 1458 1459 if (!var->pixclock) 1460 return -EINVAL; 1461 pixclock = PICOS2KHZ(var->pixclock) * 1000; 1462 1463 htotal = var->xres + var->right_margin + var->hsync_len + 1464 var->left_margin; 1465 vtotal = var->yres + var->lower_margin + var->vsync_len + 1466 var->upper_margin; 1467 1468 if (var->vmode & FB_VMODE_INTERLACED) 1469 vtotal /= 2; 1470 if (var->vmode & FB_VMODE_DOUBLE) 1471 vtotal *= 2; 1472 1473 hfreq = pixclock/htotal; 1474 hfreq = (hfreq + 500) / 1000 * 1000; 1475 1476 vfreq = hfreq/vtotal; 1477 1478 return (vfreq < vfmin || vfreq > vfmax || 1479 hfreq < hfmin || hfreq > hfmax || 1480 pixclock < dclkmin || pixclock > dclkmax) ? 1481 -EINVAL : 0; 1482 } 1483 1484 #if defined(CONFIG_FIRMWARE_EDID) && defined(CONFIG_X86) 1485 1486 /* 1487 * We need to ensure that the EDID block is only returned for 1488 * the primary graphics adapter. 1489 */ 1490 1491 const unsigned char *fb_firmware_edid(struct device *device) 1492 { 1493 struct pci_dev *dev = NULL; 1494 struct resource *res = NULL; 1495 unsigned char *edid = NULL; 1496 1497 if (device) 1498 dev = to_pci_dev(device); 1499 1500 if (dev) 1501 res = &dev->resource[PCI_ROM_RESOURCE]; 1502 1503 if (res && res->flags & IORESOURCE_ROM_SHADOW) 1504 edid = edid_info.dummy; 1505 1506 return edid; 1507 } 1508 #else 1509 const unsigned char *fb_firmware_edid(struct device *device) 1510 { 1511 return NULL; 1512 } 1513 #endif 1514 EXPORT_SYMBOL(fb_firmware_edid); 1515 1516 EXPORT_SYMBOL(fb_parse_edid); 1517 EXPORT_SYMBOL(fb_edid_to_monspecs); 1518 EXPORT_SYMBOL(fb_get_mode); 1519 EXPORT_SYMBOL(fb_validate_mode); 1520 EXPORT_SYMBOL(fb_destroy_modedb); 1521