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fbmon.c
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linux-6.19.14/drivers/video/fbdev/core/fbmon.c
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 30#include <linux/export.h> 31#include <linux/fb.h> 32#include <linux/module.h> 33#include <linux/pci.h> 34#include <linux/slab.h> 35#include <video/edid.h> 36#include <video/of_videomode.h> 37#include <video/videomode.h> 38#include "../edid.h" 39#include <linux/string_choices.h> 40 41/* 42 * EDID parser 43 */ 44 45#undef DEBUG /* define this for verbose EDID parsing output */ 46 47#ifdef DEBUG 48#define DPRINTK(fmt, args...) printk(fmt,## args) 49#else 50#define DPRINTK(fmt, args...) no_printk(fmt, ##args) 51#endif 52 53#define FBMON_FIX_HEADER 1 54#define FBMON_FIX_INPUT 2 55#define FBMON_FIX_TIMINGS 3 56 57#ifdef CONFIG_FB_MODE_HELPERS 58struct broken_edid { 59 u8 manufacturer[4]; 60 u32 model; 61 u32 fix; 62}; 63 64static const struct broken_edid brokendb[] = { 65 /* DEC FR-PCXAV-YZ */ 66 { 67 .manufacturer = "DEC", 68 .model = 0x073a, 69 .fix = FBMON_FIX_HEADER, 70 }, 71 /* ViewSonic PF775a */ 72 { 73 .manufacturer = "VSC", 74 .model = 0x5a44, 75 .fix = FBMON_FIX_INPUT, 76 }, 77 /* Sharp UXGA? */ 78 { 79 .manufacturer = "SHP", 80 .model = 0x138e, 81 .fix = FBMON_FIX_TIMINGS, 82 }, 83}; 84 85static const unsigned char edid_v1_header[] = { 0x00, 0xff, 0xff, 0xff, 86 0xff, 0xff, 0xff, 0x00 87}; 88 89static void copy_string(unsigned char *c, unsigned char *s) 90{ 91 int i; 92 c = c + 5; 93 for (i = 0; (i < 13 && *c != 0x0A); i++) 94 *(s++) = *(c++); 95 *s = 0; 96 while (i-- && (*--s == 0x20)) *s = 0; 97} 98 99static int edid_is_serial_block(unsigned char *block) 100{ 101 if ((block[0] == 0x00) && (block[1] == 0x00) && 102 (block[2] == 0x00) && (block[3] == 0xff) && 103 (block[4] == 0x00)) 104 return 1; 105 else 106 return 0; 107} 108 109static int edid_is_ascii_block(unsigned char *block) 110{ 111 if ((block[0] == 0x00) && (block[1] == 0x00) && 112 (block[2] == 0x00) && (block[3] == 0xfe) && 113 (block[4] == 0x00)) 114 return 1; 115 else 116 return 0; 117} 118 119static int edid_is_limits_block(unsigned char *block) 120{ 121 if ((block[0] == 0x00) && (block[1] == 0x00) && 122 (block[2] == 0x00) && (block[3] == 0xfd) && 123 (block[4] == 0x00)) 124 return 1; 125 else 126 return 0; 127} 128 129static int edid_is_monitor_block(unsigned char *block) 130{ 131 if ((block[0] == 0x00) && (block[1] == 0x00) && 132 (block[2] == 0x00) && (block[3] == 0xfc) && 133 (block[4] == 0x00)) 134 return 1; 135 else 136 return 0; 137} 138 139static int edid_is_timing_block(unsigned char *block) 140{ 141 if ((block[0] != 0x00) || (block[1] != 0x00) || 142 (block[2] != 0x00) || (block[4] != 0x00)) 143 return 1; 144 else 145 return 0; 146} 147 148static int check_edid(unsigned char *edid) 149{ 150 unsigned char *block = edid + ID_MANUFACTURER_NAME, manufacturer[4]; 151 unsigned char *b; 152 u32 model; 153 int i, fix = 0, ret = 0; 154 155 manufacturer[0] = ((block[0] & 0x7c) >> 2) + '@'; 156 manufacturer[1] = ((block[0] & 0x03) << 3) + 157 ((block[1] & 0xe0) >> 5) + '@'; 158 manufacturer[2] = (block[1] & 0x1f) + '@'; 159 manufacturer[3] = 0; 160 model = block[2] + (block[3] << 8); 161 162 for (i = 0; i < ARRAY_SIZE(brokendb); i++) { 163 if (!strncmp(manufacturer, brokendb[i].manufacturer, 4) && 164 brokendb[i].model == model) { 165 fix = brokendb[i].fix; 166 break; 167 } 168 } 169 170 switch (fix) { 171 case FBMON_FIX_HEADER: 172 for (i = 0; i < 8; i++) { 173 if (edid[i] != edid_v1_header[i]) { 174 ret = fix; 175 break; 176 } 177 } 178 break; 179 case FBMON_FIX_INPUT: 180 b = edid + EDID_STRUCT_DISPLAY; 181 /* Only if display is GTF capable will 182 the input type be reset to analog */ 183 if (b[4] & 0x01 && b[0] & 0x80) 184 ret = fix; 185 break; 186 case FBMON_FIX_TIMINGS: 187 b = edid + DETAILED_TIMING_DESCRIPTIONS_START; 188 ret = fix; 189 190 for (i = 0; i < 4; i++) { 191 if (edid_is_limits_block(b)) { 192 ret = 0; 193 break; 194 } 195 196 b += DETAILED_TIMING_DESCRIPTION_SIZE; 197 } 198 199 break; 200 } 201 202 if (ret) 203 printk("fbmon: The EDID Block of " 204 "Manufacturer: %s Model: 0x%x is known to " 205 "be broken,\n", manufacturer, model); 206 207 return ret; 208} 209 210static void fix_edid(unsigned char *edid, int fix) 211{ 212 int i; 213 unsigned char *b, csum = 0; 214 215 switch (fix) { 216 case FBMON_FIX_HEADER: 217 printk("fbmon: trying a header reconstruct\n"); 218 memcpy(edid, edid_v1_header, 8); 219 break; 220 case FBMON_FIX_INPUT: 221 printk("fbmon: trying to fix input type\n"); 222 b = edid + EDID_STRUCT_DISPLAY; 223 b[0] &= ~0x80; 224 edid[127] += 0x80; 225 break; 226 case FBMON_FIX_TIMINGS: 227 printk("fbmon: trying to fix monitor timings\n"); 228 b = edid + DETAILED_TIMING_DESCRIPTIONS_START; 229 for (i = 0; i < 4; i++) { 230 if (!(edid_is_serial_block(b) || 231 edid_is_ascii_block(b) || 232 edid_is_monitor_block(b) || 233 edid_is_timing_block(b))) { 234 b[0] = 0x00; 235 b[1] = 0x00; 236 b[2] = 0x00; 237 b[3] = 0xfd; 238 b[4] = 0x00; 239 b[5] = 60; /* vfmin */ 240 b[6] = 60; /* vfmax */ 241 b[7] = 30; /* hfmin */ 242 b[8] = 75; /* hfmax */ 243 b[9] = 17; /* pixclock - 170 MHz*/ 244 b[10] = 0; /* GTF */ 245 break; 246 } 247 248 b += DETAILED_TIMING_DESCRIPTION_SIZE; 249 } 250 251 for (i = 0; i < EDID_LENGTH - 1; i++) 252 csum += edid[i]; 253 254 edid[127] = 256 - csum; 255 break; 256 } 257} 258 259static int edid_checksum(unsigned char *edid) 260{ 261 unsigned char csum = 0, all_null = 0; 262 int i, err = 0, fix = check_edid(edid); 263 264 if (fix) 265 fix_edid(edid, fix); 266 267 for (i = 0; i < EDID_LENGTH; i++) { 268 csum += edid[i]; 269 all_null |= edid[i]; 270 } 271 272 if (csum == 0x00 && all_null) { 273 /* checksum passed, everything's good */ 274 err = 1; 275 } 276 277 return err; 278} 279 280static int edid_check_header(unsigned char *edid) 281{ 282 int i, err = 1, fix = check_edid(edid); 283 284 if (fix) 285 fix_edid(edid, fix); 286 287 for (i = 0; i < 8; i++) { 288 if (edid[i] != edid_v1_header[i]) 289 err = 0; 290 } 291 292 return err; 293} 294 295static void parse_vendor_block(unsigned char *block, struct fb_monspecs *specs) 296{ 297 specs->manufacturer[0] = ((block[0] & 0x7c) >> 2) + '@'; 298 specs->manufacturer[1] = ((block[0] & 0x03) << 3) + 299 ((block[1] & 0xe0) >> 5) + '@'; 300 specs->manufacturer[2] = (block[1] & 0x1f) + '@'; 301 specs->manufacturer[3] = 0; 302 specs->model = block[2] + (block[3] << 8); 303 specs->serial = block[4] + (block[5] << 8) + 304 (block[6] << 16) + (block[7] << 24); 305 specs->year = block[9] + 1990; 306 specs->week = block[8]; 307 DPRINTK(" Manufacturer: %s\n", specs->manufacturer); 308 DPRINTK(" Model: %x\n", specs->model); 309 DPRINTK(" Serial#: %u\n", specs->serial); 310 DPRINTK(" Year: %u Week %u\n", specs->year, specs->week); 311} 312 313static void get_dpms_capabilities(unsigned char flags, 314 struct fb_monspecs *specs) 315{ 316 specs->dpms = 0; 317 if (flags & DPMS_ACTIVE_OFF) 318 specs->dpms |= FB_DPMS_ACTIVE_OFF; 319 if (flags & DPMS_SUSPEND) 320 specs->dpms |= FB_DPMS_SUSPEND; 321 if (flags & DPMS_STANDBY) 322 specs->dpms |= FB_DPMS_STANDBY; 323 DPRINTK(" DPMS: Active %s, Suspend %s, Standby %s\n", 324 str_yes_no(flags & DPMS_ACTIVE_OFF), 325 str_yes_no(flags & DPMS_SUSPEND), 326 str_yes_no(flags & DPMS_STANDBY)); 327} 328 329static void get_chroma(unsigned char *block, struct fb_monspecs *specs) 330{ 331 int tmp; 332 333 DPRINTK(" Chroma\n"); 334 /* Chromaticity data */ 335 tmp = ((block[5] & (3 << 6)) >> 6) | (block[0x7] << 2); 336 tmp *= 1000; 337 tmp += 512; 338 specs->chroma.redx = tmp/1024; 339 DPRINTK(" RedX: 0.%03d ", specs->chroma.redx); 340 341 tmp = ((block[5] & (3 << 4)) >> 4) | (block[0x8] << 2); 342 tmp *= 1000; 343 tmp += 512; 344 specs->chroma.redy = tmp/1024; 345 DPRINTK("RedY: 0.%03d\n", specs->chroma.redy); 346 347 tmp = ((block[5] & (3 << 2)) >> 2) | (block[0x9] << 2); 348 tmp *= 1000; 349 tmp += 512; 350 specs->chroma.greenx = tmp/1024; 351 DPRINTK(" GreenX: 0.%03d ", specs->chroma.greenx); 352 353 tmp = (block[5] & 3) | (block[0xa] << 2); 354 tmp *= 1000; 355 tmp += 512; 356 specs->chroma.greeny = tmp/1024; 357 DPRINTK("GreenY: 0.%03d\n", specs->chroma.greeny); 358 359 tmp = ((block[6] & (3 << 6)) >> 6) | (block[0xb] << 2); 360 tmp *= 1000; 361 tmp += 512; 362 specs->chroma.bluex = tmp/1024; 363 DPRINTK(" BlueX: 0.%03d ", specs->chroma.bluex); 364 365 tmp = ((block[6] & (3 << 4)) >> 4) | (block[0xc] << 2); 366 tmp *= 1000; 367 tmp += 512; 368 specs->chroma.bluey = tmp/1024; 369 DPRINTK("BlueY: 0.%03d\n", specs->chroma.bluey); 370 371 tmp = ((block[6] & (3 << 2)) >> 2) | (block[0xd] << 2); 372 tmp *= 1000; 373 tmp += 512; 374 specs->chroma.whitex = tmp/1024; 375 DPRINTK(" WhiteX: 0.%03d ", specs->chroma.whitex); 376 377 tmp = (block[6] & 3) | (block[0xe] << 2); 378 tmp *= 1000; 379 tmp += 512; 380 specs->chroma.whitey = tmp/1024; 381 DPRINTK("WhiteY: 0.%03d\n", specs->chroma.whitey); 382} 383 384static void calc_mode_timings(int xres, int yres, int refresh, 385 struct fb_videomode *mode) 386{ 387 struct fb_var_screeninfo *var; 388 389 var = kzalloc(sizeof(struct fb_var_screeninfo), GFP_KERNEL); 390 391 if (var) { 392 var->xres = xres; 393 var->yres = yres; 394 fb_get_mode(FB_VSYNCTIMINGS | FB_IGNOREMON, 395 refresh, var, NULL); 396 mode->xres = xres; 397 mode->yres = yres; 398 mode->pixclock = var->pixclock; 399 mode->refresh = refresh; 400 mode->left_margin = var->left_margin; 401 mode->right_margin = var->right_margin; 402 mode->upper_margin = var->upper_margin; 403 mode->lower_margin = var->lower_margin; 404 mode->hsync_len = var->hsync_len; 405 mode->vsync_len = var->vsync_len; 406 mode->vmode = 0; 407 mode->sync = 0; 408 kfree(var); 409 } 410} 411 412static int get_est_timing(unsigned char *block, struct fb_videomode *mode) 413{ 414 int num = 0; 415 unsigned char c; 416 417 c = block[0]; 418 if (c&0x80) { 419 calc_mode_timings(720, 400, 70, &mode[num]); 420 mode[num++].flag = FB_MODE_IS_CALCULATED; 421 DPRINTK(" 720x400@70Hz\n"); 422 } 423 if (c&0x40) { 424 calc_mode_timings(720, 400, 88, &mode[num]); 425 mode[num++].flag = FB_MODE_IS_CALCULATED; 426 DPRINTK(" 720x400@88Hz\n"); 427 } 428 if (c&0x20) { 429 mode[num++] = vesa_modes[3]; 430 DPRINTK(" 640x480@60Hz\n"); 431 } 432 if (c&0x10) { 433 calc_mode_timings(640, 480, 67, &mode[num]); 434 mode[num++].flag = FB_MODE_IS_CALCULATED; 435 DPRINTK(" 640x480@67Hz\n"); 436 } 437 if (c&0x08) { 438 mode[num++] = vesa_modes[4]; 439 DPRINTK(" 640x480@72Hz\n"); 440 } 441 if (c&0x04) { 442 mode[num++] = vesa_modes[5]; 443 DPRINTK(" 640x480@75Hz\n"); 444 } 445 if (c&0x02) { 446 mode[num++] = vesa_modes[7]; 447 DPRINTK(" 800x600@56Hz\n"); 448 } 449 if (c&0x01) { 450 mode[num++] = vesa_modes[8]; 451 DPRINTK(" 800x600@60Hz\n"); 452 } 453 454 c = block[1]; 455 if (c&0x80) { 456 mode[num++] = vesa_modes[9]; 457 DPRINTK(" 800x600@72Hz\n"); 458 } 459 if (c&0x40) { 460 mode[num++] = vesa_modes[10]; 461 DPRINTK(" 800x600@75Hz\n"); 462 } 463 if (c&0x20) { 464 calc_mode_timings(832, 624, 75, &mode[num]); 465 mode[num++].flag = FB_MODE_IS_CALCULATED; 466 DPRINTK(" 832x624@75Hz\n"); 467 } 468 if (c&0x10) { 469 mode[num++] = vesa_modes[12]; 470 DPRINTK(" 1024x768@87Hz Interlaced\n"); 471 } 472 if (c&0x08) { 473 mode[num++] = vesa_modes[13]; 474 DPRINTK(" 1024x768@60Hz\n"); 475 } 476 if (c&0x04) { 477 mode[num++] = vesa_modes[14]; 478 DPRINTK(" 1024x768@70Hz\n"); 479 } 480 if (c&0x02) { 481 mode[num++] = vesa_modes[15]; 482 DPRINTK(" 1024x768@75Hz\n"); 483 } 484 if (c&0x01) { 485 mode[num++] = vesa_modes[21]; 486 DPRINTK(" 1280x1024@75Hz\n"); 487 } 488 c = block[2]; 489 if (c&0x80) { 490 mode[num++] = vesa_modes[17]; 491 DPRINTK(" 1152x870@75Hz\n"); 492 } 493 DPRINTK(" Manufacturer's mask: %x\n",c&0x7F); 494 return num; 495} 496 497static int get_std_timing(unsigned char *block, struct fb_videomode *mode, 498 int ver, int rev, const struct fb_monspecs *specs) 499{ 500 int i; 501 502 for (i = 0; i < DMT_SIZE; i++) { 503 u32 std_2byte_code = block[0] << 8 | block[1]; 504 if (std_2byte_code == dmt_modes[i].std_2byte_code) 505 break; 506 } 507 508 if (i < DMT_SIZE && dmt_modes[i].mode) { 509 /* DMT mode found */ 510 *mode = *dmt_modes[i].mode; 511 mode->flag |= FB_MODE_IS_STANDARD; 512 DPRINTK(" DMT id=%d\n", dmt_modes[i].dmt_id); 513 514 } else { 515 int xres, yres = 0, refresh, ratio; 516 517 xres = (block[0] + 31) * 8; 518 if (xres <= 256) 519 return 0; 520 521 ratio = (block[1] & 0xc0) >> 6; 522 switch (ratio) { 523 case 0: 524 /* in EDID 1.3 the meaning of 0 changed to 16:10 (prior 1:1) */ 525 if (ver < 1 || (ver == 1 && rev < 3)) 526 yres = xres; 527 else 528 yres = (xres * 10)/16; 529 break; 530 case 1: 531 yres = (xres * 3)/4; 532 break; 533 case 2: 534 yres = (xres * 4)/5; 535 break; 536 case 3: 537 yres = (xres * 9)/16; 538 break; 539 } 540 refresh = (block[1] & 0x3f) + 60; 541 DPRINTK(" %dx%d@%dHz\n", xres, yres, refresh); 542 543 calc_mode_timings(xres, yres, refresh, mode); 544 } 545 546 /* Check the mode we got is within valid spec of the monitor */ 547 if (specs && specs->dclkmax 548 && PICOS2KHZ(mode->pixclock) * 1000 > specs->dclkmax) { 549 DPRINTK(" mode exceed max DCLK\n"); 550 return 0; 551 } 552 553 return 1; 554} 555 556static int get_dst_timing(unsigned char *block, struct fb_videomode *mode, 557 int ver, int rev, const struct fb_monspecs *specs) 558{ 559 int j, num = 0; 560 561 for (j = 0; j < 6; j++, block += STD_TIMING_DESCRIPTION_SIZE) 562 num += get_std_timing(block, &mode[num], ver, rev, specs); 563 564 return num; 565} 566 567static void get_detailed_timing(unsigned char *block, 568 struct fb_videomode *mode) 569{ 570 mode->xres = H_ACTIVE; 571 mode->yres = V_ACTIVE; 572 mode->pixclock = PIXEL_CLOCK; 573 mode->pixclock /= 1000; 574 mode->pixclock = KHZ2PICOS(mode->pixclock); 575 mode->right_margin = H_SYNC_OFFSET; 576 mode->left_margin = (H_ACTIVE + H_BLANKING) - 577 (H_ACTIVE + H_SYNC_OFFSET + H_SYNC_WIDTH); 578 mode->upper_margin = V_BLANKING - V_SYNC_OFFSET - 579 V_SYNC_WIDTH; 580 mode->lower_margin = V_SYNC_OFFSET; 581 mode->hsync_len = H_SYNC_WIDTH; 582 mode->vsync_len = V_SYNC_WIDTH; 583 if (HSYNC_POSITIVE) 584 mode->sync |= FB_SYNC_HOR_HIGH_ACT; 585 if (VSYNC_POSITIVE) 586 mode->sync |= FB_SYNC_VERT_HIGH_ACT; 587 mode->refresh = PIXEL_CLOCK/((H_ACTIVE + H_BLANKING) * 588 (V_ACTIVE + V_BLANKING)); 589 if (INTERLACED) { 590 mode->yres *= 2; 591 mode->upper_margin *= 2; 592 mode->lower_margin *= 2; 593 mode->vsync_len *= 2; 594 mode->vmode |= FB_VMODE_INTERLACED; 595 } 596 mode->flag = FB_MODE_IS_DETAILED; 597 598 DPRINTK(" %d MHz ", PIXEL_CLOCK/1000000); 599 DPRINTK("%d %d %d %d ", H_ACTIVE, H_ACTIVE + H_SYNC_OFFSET, 600 H_ACTIVE + H_SYNC_OFFSET + H_SYNC_WIDTH, H_ACTIVE + H_BLANKING); 601 DPRINTK("%d %d %d %d ", V_ACTIVE, V_ACTIVE + V_SYNC_OFFSET, 602 V_ACTIVE + V_SYNC_OFFSET + V_SYNC_WIDTH, V_ACTIVE + V_BLANKING); 603 DPRINTK("%sHSync %sVSync\n\n", (HSYNC_POSITIVE) ? "+" : "-", 604 (VSYNC_POSITIVE) ? "+" : "-"); 605} 606 607/** 608 * fb_create_modedb - create video mode database 609 * @edid: EDID data 610 * @dbsize: database size 611 * @specs: monitor specifications, may be NULL 612 * 613 * RETURNS: struct fb_videomode, @dbsize contains length of database 614 * 615 * DESCRIPTION: 616 * This function builds a mode database using the contents of the EDID 617 * data 618 */ 619static struct fb_videomode *fb_create_modedb(unsigned char *edid, int *dbsize, 620 const struct fb_monspecs *specs) 621{ 622 struct fb_videomode *mode, *m; 623 unsigned char *block; 624 int num = 0, i, first = 1; 625 int ver, rev; 626 627 mode = kcalloc(50, sizeof(struct fb_videomode), GFP_KERNEL); 628 if (mode == NULL) 629 return NULL; 630 631 if (edid == NULL || !edid_checksum(edid) || 632 !edid_check_header(edid)) { 633 kfree(mode); 634 return NULL; 635 } 636 637 ver = edid[EDID_STRUCT_VERSION]; 638 rev = edid[EDID_STRUCT_REVISION]; 639 640 *dbsize = 0; 641 642 DPRINTK(" Detailed Timings\n"); 643 block = edid + DETAILED_TIMING_DESCRIPTIONS_START; 644 for (i = 0; i < 4; i++, block+= DETAILED_TIMING_DESCRIPTION_SIZE) { 645 if (!(block[0] == 0x00 && block[1] == 0x00)) { 646 get_detailed_timing(block, &mode[num]); 647 if (first) { 648 mode[num].flag |= FB_MODE_IS_FIRST; 649 first = 0; 650 } 651 num++; 652 } 653 } 654 655 DPRINTK(" Supported VESA Modes\n"); 656 block = edid + ESTABLISHED_TIMING_1; 657 num += get_est_timing(block, &mode[num]); 658 659 DPRINTK(" Standard Timings\n"); 660 block = edid + STD_TIMING_DESCRIPTIONS_START; 661 for (i = 0; i < STD_TIMING; i++, block += STD_TIMING_DESCRIPTION_SIZE) 662 num += get_std_timing(block, &mode[num], ver, rev, specs); 663 664 block = edid + DETAILED_TIMING_DESCRIPTIONS_START; 665 for (i = 0; i < 4; i++, block+= DETAILED_TIMING_DESCRIPTION_SIZE) { 666 if (block[0] == 0x00 && block[1] == 0x00 && block[3] == 0xfa) 667 num += get_dst_timing(block + 5, &mode[num], 668 ver, rev, specs); 669 } 670 671 /* Yikes, EDID data is totally useless */ 672 if (!num) { 673 kfree(mode); 674 return NULL; 675 } 676 677 *dbsize = num; 678 m = kmalloc_array(num, sizeof(struct fb_videomode), GFP_KERNEL); 679 if (!m) 680 return mode; 681 memmove(m, mode, num * sizeof(struct fb_videomode)); 682 kfree(mode); 683 return m; 684} 685 686/** 687 * fb_destroy_modedb - destroys mode database 688 * @modedb: mode database to destroy 689 * 690 * DESCRIPTION: 691 * Destroy mode database created by fb_create_modedb 692 */ 693void fb_destroy_modedb(struct fb_videomode *modedb) 694{ 695 kfree(modedb); 696} 697 698static int fb_get_monitor_limits(unsigned char *edid, struct fb_monspecs *specs) 699{ 700 int i, retval = 1; 701 unsigned char *block; 702 703 block = edid + DETAILED_TIMING_DESCRIPTIONS_START; 704 705 DPRINTK(" Monitor Operating Limits: "); 706 707 for (i = 0; i < 4; i++, block += DETAILED_TIMING_DESCRIPTION_SIZE) { 708 if (edid_is_limits_block(block)) { 709 specs->hfmin = H_MIN_RATE * 1000; 710 specs->hfmax = H_MAX_RATE * 1000; 711 specs->vfmin = V_MIN_RATE; 712 specs->vfmax = V_MAX_RATE; 713 specs->dclkmax = MAX_PIXEL_CLOCK * 1000000; 714 specs->gtf = (GTF_SUPPORT) ? 1 : 0; 715 retval = 0; 716 DPRINTK("From EDID\n"); 717 break; 718 } 719 } 720 721 /* estimate monitor limits based on modes supported */ 722 if (retval) { 723 struct fb_videomode *modes, *mode; 724 int num_modes, hz, hscan, pixclock; 725 int vtotal, htotal; 726 727 modes = fb_create_modedb(edid, &num_modes, specs); 728 if (!modes) { 729 DPRINTK("None Available\n"); 730 return 1; 731 } 732 733 retval = 0; 734 for (i = 0; i < num_modes; i++) { 735 mode = &modes[i]; 736 pixclock = PICOS2KHZ(modes[i].pixclock) * 1000; 737 htotal = mode->xres + mode->right_margin + mode->hsync_len 738 + mode->left_margin; 739 vtotal = mode->yres + mode->lower_margin + mode->vsync_len 740 + mode->upper_margin; 741 742 if (mode->vmode & FB_VMODE_INTERLACED) 743 vtotal /= 2; 744 745 if (mode->vmode & FB_VMODE_DOUBLE) 746 vtotal *= 2; 747 748 hscan = (pixclock + htotal / 2) / htotal; 749 hscan = (hscan + 500) / 1000 * 1000; 750 hz = (hscan + vtotal / 2) / vtotal; 751 752 if (specs->dclkmax == 0 || specs->dclkmax < pixclock) 753 specs->dclkmax = pixclock; 754 755 if (specs->dclkmin == 0 || specs->dclkmin > pixclock) 756 specs->dclkmin = pixclock; 757 758 if (specs->hfmax == 0 || specs->hfmax < hscan) 759 specs->hfmax = hscan; 760 761 if (specs->hfmin == 0 || specs->hfmin > hscan) 762 specs->hfmin = hscan; 763 764 if (specs->vfmax == 0 || specs->vfmax < hz) 765 specs->vfmax = hz; 766 767 if (specs->vfmin == 0 || specs->vfmin > hz) 768 specs->vfmin = hz; 769 } 770 DPRINTK("Extrapolated\n"); 771 fb_destroy_modedb(modes); 772 } 773 DPRINTK(" H: %d-%dKHz V: %d-%dHz DCLK: %dMHz\n", 774 specs->hfmin/1000, specs->hfmax/1000, specs->vfmin, 775 specs->vfmax, specs->dclkmax/1000000); 776 return retval; 777} 778 779static void get_monspecs(unsigned char *edid, struct fb_monspecs *specs) 780{ 781 unsigned char c, *block; 782 783 block = edid + EDID_STRUCT_DISPLAY; 784 785 fb_get_monitor_limits(edid, specs); 786 787 c = block[0] & 0x80; 788 specs->input = 0; 789 if (c) { 790 specs->input |= FB_DISP_DDI; 791 DPRINTK(" Digital Display Input"); 792 } else { 793 DPRINTK(" Analog Display Input: Input Voltage - "); 794 switch ((block[0] & 0x60) >> 5) { 795 case 0: 796 DPRINTK("0.700V/0.300V"); 797 specs->input |= FB_DISP_ANA_700_300; 798 break; 799 case 1: 800 DPRINTK("0.714V/0.286V"); 801 specs->input |= FB_DISP_ANA_714_286; 802 break; 803 case 2: 804 DPRINTK("1.000V/0.400V"); 805 specs->input |= FB_DISP_ANA_1000_400; 806 break; 807 case 3: 808 DPRINTK("0.700V/0.000V"); 809 specs->input |= FB_DISP_ANA_700_000; 810 break; 811 } 812 } 813 DPRINTK("\n Sync: "); 814 c = block[0] & 0x10; 815 if (c) 816 DPRINTK(" Configurable signal level\n"); 817 c = block[0] & 0x0f; 818 specs->signal = 0; 819 if (c & 0x10) { 820 DPRINTK("Blank to Blank "); 821 specs->signal |= FB_SIGNAL_BLANK_BLANK; 822 } 823 if (c & 0x08) { 824 DPRINTK("Separate "); 825 specs->signal |= FB_SIGNAL_SEPARATE; 826 } 827 if (c & 0x04) { 828 DPRINTK("Composite "); 829 specs->signal |= FB_SIGNAL_COMPOSITE; 830 } 831 if (c & 0x02) { 832 DPRINTK("Sync on Green "); 833 specs->signal |= FB_SIGNAL_SYNC_ON_GREEN; 834 } 835 if (c & 0x01) { 836 DPRINTK("Serration on "); 837 specs->signal |= FB_SIGNAL_SERRATION_ON; 838 } 839 DPRINTK("\n"); 840 specs->max_x = block[1]; 841 specs->max_y = block[2]; 842 DPRINTK(" Max H-size in cm: "); 843 if (specs->max_x) 844 DPRINTK("%d\n", specs->max_x); 845 else 846 DPRINTK("variable\n"); 847 DPRINTK(" Max V-size in cm: "); 848 if (specs->max_y) 849 DPRINTK("%d\n", specs->max_y); 850 else 851 DPRINTK("variable\n"); 852 853 c = block[3]; 854 specs->gamma = c+100; 855 DPRINTK(" Gamma: "); 856 DPRINTK("%d.%d\n", specs->gamma/100, specs->gamma % 100); 857 858 get_dpms_capabilities(block[4], specs); 859 860 switch ((block[4] & 0x18) >> 3) { 861 case 0: 862 DPRINTK(" Monochrome/Grayscale\n"); 863 specs->input |= FB_DISP_MONO; 864 break; 865 case 1: 866 DPRINTK(" RGB Color Display\n"); 867 specs->input |= FB_DISP_RGB; 868 break; 869 case 2: 870 DPRINTK(" Non-RGB Multicolor Display\n"); 871 specs->input |= FB_DISP_MULTI; 872 break; 873 default: 874 DPRINTK(" Unknown\n"); 875 specs->input |= FB_DISP_UNKNOWN; 876 break; 877 } 878 879 get_chroma(block, specs); 880 881 specs->misc = 0; 882 c = block[4] & 0x7; 883 if (c & 0x04) { 884 DPRINTK(" Default color format is primary\n"); 885 specs->misc |= FB_MISC_PRIM_COLOR; 886 } 887 if (c & 0x02) { 888 DPRINTK(" First DETAILED Timing is preferred\n"); 889 specs->misc |= FB_MISC_1ST_DETAIL; 890 } 891 if (c & 0x01) { 892 printk(" Display is GTF capable\n"); 893 specs->gtf = 1; 894 } 895} 896 897int fb_parse_edid(unsigned char *edid, struct fb_var_screeninfo *var) 898{ 899 int i; 900 unsigned char *block; 901 902 if (edid == NULL || var == NULL) 903 return 1; 904 905 if (!(edid_checksum(edid))) 906 return 1; 907 908 if (!(edid_check_header(edid))) 909 return 1; 910 911 block = edid + DETAILED_TIMING_DESCRIPTIONS_START; 912 913 for (i = 0; i < 4; i++, block += DETAILED_TIMING_DESCRIPTION_SIZE) { 914 if (edid_is_timing_block(block)) { 915 var->xres = var->xres_virtual = H_ACTIVE; 916 var->yres = var->yres_virtual = V_ACTIVE; 917 var->height = var->width = 0; 918 var->right_margin = H_SYNC_OFFSET; 919 var->left_margin = (H_ACTIVE + H_BLANKING) - 920 (H_ACTIVE + H_SYNC_OFFSET + H_SYNC_WIDTH); 921 var->upper_margin = V_BLANKING - V_SYNC_OFFSET - 922 V_SYNC_WIDTH; 923 var->lower_margin = V_SYNC_OFFSET; 924 var->hsync_len = H_SYNC_WIDTH; 925 var->vsync_len = V_SYNC_WIDTH; 926 var->pixclock = PIXEL_CLOCK; 927 var->pixclock /= 1000; 928 var->pixclock = KHZ2PICOS(var->pixclock); 929 930 if (HSYNC_POSITIVE) 931 var->sync |= FB_SYNC_HOR_HIGH_ACT; 932 if (VSYNC_POSITIVE) 933 var->sync |= FB_SYNC_VERT_HIGH_ACT; 934 return 0; 935 } 936 } 937 return 1; 938} 939 940void fb_edid_to_monspecs(unsigned char *edid, struct fb_monspecs *specs) 941{ 942 unsigned char *block; 943 int i, found = 0; 944 945 if (edid == NULL) 946 return; 947 948 if (!(edid_checksum(edid))) 949 return; 950 951 if (!(edid_check_header(edid))) 952 return; 953 954 memset(specs, 0, sizeof(struct fb_monspecs)); 955 956 specs->version = edid[EDID_STRUCT_VERSION]; 957 specs->revision = edid[EDID_STRUCT_REVISION]; 958 959 DPRINTK("========================================\n"); 960 DPRINTK("Display Information (EDID)\n"); 961 DPRINTK("========================================\n"); 962 DPRINTK(" EDID Version %d.%d\n", (int) specs->version, 963 (int) specs->revision); 964 965 parse_vendor_block(edid + ID_MANUFACTURER_NAME, specs); 966 967 block = edid + DETAILED_TIMING_DESCRIPTIONS_START; 968 for (i = 0; i < 4; i++, block += DETAILED_TIMING_DESCRIPTION_SIZE) { 969 if (edid_is_serial_block(block)) { 970 copy_string(block, specs->serial_no); 971 DPRINTK(" Serial Number: %s\n", specs->serial_no); 972 } else if (edid_is_ascii_block(block)) { 973 copy_string(block, specs->ascii); 974 DPRINTK(" ASCII Block: %s\n", specs->ascii); 975 } else if (edid_is_monitor_block(block)) { 976 copy_string(block, specs->monitor); 977 DPRINTK(" Monitor Name: %s\n", specs->monitor); 978 } 979 } 980 981 DPRINTK(" Display Characteristics:\n"); 982 get_monspecs(edid, specs); 983 984 specs->modedb = fb_create_modedb(edid, &specs->modedb_len, specs); 985 if (!specs->modedb) 986 return; 987 988 /* 989 * Workaround for buggy EDIDs that sets that the first 990 * detailed timing is preferred but has not detailed 991 * timing specified 992 */ 993 for (i = 0; i < specs->modedb_len; i++) { 994 if (specs->modedb[i].flag & FB_MODE_IS_DETAILED) { 995 found = 1; 996 break; 997 } 998 } 999 1000 if (!found) 1001 specs->misc &= ~FB_MISC_1ST_DETAIL; 1002 1003 DPRINTK("========================================\n"); 1004} 1005 1006/* 1007 * VESA Generalized Timing Formula (GTF) 1008 */ 1009 1010#define FLYBACK 550 1011#define V_FRONTPORCH 1 1012#define H_OFFSET 40 1013#define H_SCALEFACTOR 20 1014#define H_BLANKSCALE 128 1015#define H_GRADIENT 600 1016#define C_VAL 30 1017#define M_VAL 300 1018 1019struct __fb_timings { 1020 u32 dclk; 1021 u32 hfreq; 1022 u32 vfreq; 1023 u32 hactive; 1024 u32 vactive; 1025 u32 hblank; 1026 u32 vblank; 1027 u32 htotal; 1028 u32 vtotal; 1029}; 1030 1031/** 1032 * fb_get_vblank - get vertical blank time 1033 * @hfreq: horizontal freq 1034 * 1035 * DESCRIPTION: 1036 * vblank = right_margin + vsync_len + left_margin 1037 * 1038 * given: right_margin = 1 (V_FRONTPORCH) 1039 * vsync_len = 3 1040 * flyback = 550 1041 * 1042 * flyback * hfreq 1043 * left_margin = --------------- - vsync_len 1044 * 1000000 1045 */ 1046static u32 fb_get_vblank(u32 hfreq) 1047{ 1048 u32 vblank; 1049 1050 vblank = (hfreq * FLYBACK)/1000; 1051 vblank = (vblank + 500)/1000; 1052 return (vblank + V_FRONTPORCH); 1053} 1054 1055/** 1056 * fb_get_hblank_by_hfreq - get horizontal blank time given hfreq 1057 * @hfreq: horizontal freq 1058 * @xres: horizontal resolution in pixels 1059 * 1060 * DESCRIPTION: 1061 * 1062 * xres * duty_cycle 1063 * hblank = ------------------ 1064 * 100 - duty_cycle 1065 * 1066 * duty cycle = percent of htotal assigned to inactive display 1067 * duty cycle = C - (M/Hfreq) 1068 * 1069 * where: C = ((offset - scale factor) * blank_scale) 1070 * -------------------------------------- + scale factor 1071 * 256 1072 * M = blank_scale * gradient 1073 * 1074 */ 1075static u32 fb_get_hblank_by_hfreq(u32 hfreq, u32 xres) 1076{ 1077 u32 c_val, m_val, duty_cycle, hblank; 1078 1079 c_val = (((H_OFFSET - H_SCALEFACTOR) * H_BLANKSCALE)/256 + 1080 H_SCALEFACTOR) * 1000; 1081 m_val = (H_BLANKSCALE * H_GRADIENT)/256; 1082 m_val = (m_val * 1000000)/hfreq; 1083 duty_cycle = c_val - m_val; 1084 hblank = (xres * duty_cycle)/(100000 - duty_cycle); 1085 return (hblank); 1086} 1087 1088/** 1089 * fb_get_hblank_by_dclk - get horizontal blank time given pixelclock 1090 * @dclk: pixelclock in Hz 1091 * @xres: horizontal resolution in pixels 1092 * 1093 * DESCRIPTION: 1094 * 1095 * xres * duty_cycle 1096 * hblank = ------------------ 1097 * 100 - duty_cycle 1098 * 1099 * duty cycle = percent of htotal assigned to inactive display 1100 * duty cycle = C - (M * h_period) 1101 * 1102 * where: h_period = SQRT(100 - C + (0.4 * xres * M)/dclk) + C - 100 1103 * ----------------------------------------------- 1104 * 2 * M 1105 * M = 300; 1106 * C = 30; 1107 */ 1108static u32 fb_get_hblank_by_dclk(u32 dclk, u32 xres) 1109{ 1110 u32 duty_cycle, h_period, hblank; 1111 1112 dclk /= 1000; 1113 h_period = 100 - C_VAL; 1114 h_period *= h_period; 1115 h_period += (M_VAL * xres * 2 * 1000)/(5 * dclk); 1116 h_period *= 10000; 1117 1118 h_period = int_sqrt(h_period); 1119 h_period -= (100 - C_VAL) * 100; 1120 h_period *= 1000; 1121 h_period /= 2 * M_VAL; 1122 1123 duty_cycle = C_VAL * 1000 - (M_VAL * h_period)/100; 1124 hblank = (xres * duty_cycle)/(100000 - duty_cycle) + 8; 1125 hblank &= ~15; 1126 return (hblank); 1127} 1128 1129/** 1130 * fb_get_hfreq - estimate hsync 1131 * @vfreq: vertical refresh rate 1132 * @yres: vertical resolution 1133 * 1134 * DESCRIPTION: 1135 * 1136 * (yres + front_port) * vfreq * 1000000 1137 * hfreq = ------------------------------------- 1138 * (1000000 - (vfreq * FLYBACK) 1139 * 1140 */ 1141 1142static u32 fb_get_hfreq(u32 vfreq, u32 yres) 1143{ 1144 u32 divisor, hfreq; 1145 1146 divisor = (1000000 - (vfreq * FLYBACK))/1000; 1147 hfreq = (yres + V_FRONTPORCH) * vfreq * 1000; 1148 return (hfreq/divisor); 1149} 1150 1151static void fb_timings_vfreq(struct __fb_timings *timings) 1152{ 1153 timings->hfreq = fb_get_hfreq(timings->vfreq, timings->vactive); 1154 timings->vblank = fb_get_vblank(timings->hfreq); 1155 timings->vtotal = timings->vactive + timings->vblank; 1156 timings->hblank = fb_get_hblank_by_hfreq(timings->hfreq, 1157 timings->hactive); 1158 timings->htotal = timings->hactive + timings->hblank; 1159 timings->dclk = timings->htotal * timings->hfreq; 1160} 1161 1162static void fb_timings_hfreq(struct __fb_timings *timings) 1163{ 1164 timings->vblank = fb_get_vblank(timings->hfreq); 1165 timings->vtotal = timings->vactive + timings->vblank; 1166 timings->vfreq = timings->hfreq/timings->vtotal; 1167 timings->hblank = fb_get_hblank_by_hfreq(timings->hfreq, 1168 timings->hactive); 1169 timings->htotal = timings->hactive + timings->hblank; 1170 timings->dclk = timings->htotal * timings->hfreq; 1171} 1172 1173static void fb_timings_dclk(struct __fb_timings *timings) 1174{ 1175 timings->hblank = fb_get_hblank_by_dclk(timings->dclk, 1176 timings->hactive); 1177 timings->htotal = timings->hactive + timings->hblank; 1178 timings->hfreq = timings->dclk/timings->htotal; 1179 timings->vblank = fb_get_vblank(timings->hfreq); 1180 timings->vtotal = timings->vactive + timings->vblank; 1181 timings->vfreq = timings->hfreq/timings->vtotal; 1182} 1183 1184/* 1185 * fb_get_mode - calculates video mode using VESA GTF 1186 * @flags: if: 0 - maximize vertical refresh rate 1187 * 1 - vrefresh-driven calculation; 1188 * 2 - hscan-driven calculation; 1189 * 3 - pixelclock-driven calculation; 1190 * @val: depending on @flags, ignored, vrefresh, hsync or pixelclock 1191 * @var: pointer to fb_var_screeninfo 1192 * @info: pointer to fb_info 1193 * 1194 * DESCRIPTION: 1195 * Calculates video mode based on monitor specs using VESA GTF. 1196 * The GTF is best for VESA GTF compliant monitors but is 1197 * specifically formulated to work for older monitors as well. 1198 * 1199 * If @flag==0, the function will attempt to maximize the 1200 * refresh rate. Otherwise, it will calculate timings based on 1201 * the flag and accompanying value. 1202 * 1203 * If FB_IGNOREMON bit is set in @flags, monitor specs will be 1204 * ignored and @var will be filled with the calculated timings. 1205 * 1206 * All calculations are based on the VESA GTF Spreadsheet 1207 * available at VESA's public ftp (https://www.vesa.org). 1208 * 1209 * NOTES: 1210 * The timings generated by the GTF will be different from VESA 1211 * DMT. It might be a good idea to keep a table of standard 1212 * VESA modes as well. The GTF may also not work for some displays, 1213 * such as, and especially, analog TV. 1214 * 1215 * REQUIRES: 1216 * A valid info->monspecs, otherwise 'safe numbers' will be used. 1217 */ 1218int fb_get_mode(int flags, u32 val, struct fb_var_screeninfo *var, struct fb_info *info) 1219{ 1220 struct __fb_timings *timings; 1221 u32 interlace = 1, dscan = 1; 1222 u32 hfmin, hfmax, vfmin, vfmax, dclkmin, dclkmax, err = 0; 1223 1224 1225 timings = kzalloc(sizeof(struct __fb_timings), GFP_KERNEL); 1226 1227 if (!timings) 1228 return -ENOMEM; 1229 1230 /* 1231 * If monspecs are invalid, use values that are enough 1232 * for 640x480@60 1233 */ 1234 if (!info || !info->monspecs.hfmax || !info->monspecs.vfmax || 1235 !info->monspecs.dclkmax || 1236 info->monspecs.hfmax < info->monspecs.hfmin || 1237 info->monspecs.vfmax < info->monspecs.vfmin || 1238 info->monspecs.dclkmax < info->monspecs.dclkmin) { 1239 hfmin = 29000; hfmax = 30000; 1240 vfmin = 60; vfmax = 60; 1241 dclkmin = 0; dclkmax = 25000000; 1242 } else { 1243 hfmin = info->monspecs.hfmin; 1244 hfmax = info->monspecs.hfmax; 1245 vfmin = info->monspecs.vfmin; 1246 vfmax = info->monspecs.vfmax; 1247 dclkmin = info->monspecs.dclkmin; 1248 dclkmax = info->monspecs.dclkmax; 1249 } 1250 1251 timings->hactive = var->xres; 1252 timings->vactive = var->yres; 1253 if (var->vmode & FB_VMODE_INTERLACED) { 1254 timings->vactive /= 2; 1255 interlace = 2; 1256 } 1257 if (var->vmode & FB_VMODE_DOUBLE) { 1258 timings->vactive *= 2; 1259 dscan = 2; 1260 } 1261 1262 switch (flags & ~FB_IGNOREMON) { 1263 case FB_MAXTIMINGS: /* maximize refresh rate */ 1264 timings->hfreq = hfmax; 1265 fb_timings_hfreq(timings); 1266 if (timings->vfreq > vfmax) { 1267 timings->vfreq = vfmax; 1268 fb_timings_vfreq(timings); 1269 } 1270 if (timings->dclk > dclkmax) { 1271 timings->dclk = dclkmax; 1272 fb_timings_dclk(timings); 1273 } 1274 break; 1275 case FB_VSYNCTIMINGS: /* vrefresh driven */ 1276 timings->vfreq = val; 1277 fb_timings_vfreq(timings); 1278 break; 1279 case FB_HSYNCTIMINGS: /* hsync driven */ 1280 timings->hfreq = val; 1281 fb_timings_hfreq(timings); 1282 break; 1283 case FB_DCLKTIMINGS: /* pixelclock driven */ 1284 timings->dclk = PICOS2KHZ(val) * 1000; 1285 fb_timings_dclk(timings); 1286 break; 1287 default: 1288 err = -EINVAL; 1289 1290 } 1291 1292 if (err || (!(flags & FB_IGNOREMON) && 1293 (timings->vfreq < vfmin || timings->vfreq > vfmax || 1294 timings->hfreq < hfmin || timings->hfreq > hfmax || 1295 timings->dclk < dclkmin || timings->dclk > dclkmax))) { 1296 err = -EINVAL; 1297 } else { 1298 var->pixclock = KHZ2PICOS(timings->dclk/1000); 1299 var->hsync_len = (timings->htotal * 8)/100; 1300 var->right_margin = (timings->hblank/2) - var->hsync_len; 1301 var->left_margin = timings->hblank - var->right_margin - 1302 var->hsync_len; 1303 var->vsync_len = (3 * interlace)/dscan; 1304 var->lower_margin = (1 * interlace)/dscan; 1305 var->upper_margin = (timings->vblank * interlace)/dscan - 1306 (var->vsync_len + var->lower_margin); 1307 } 1308 1309 kfree(timings); 1310 return err; 1311} 1312 1313#ifdef CONFIG_VIDEOMODE_HELPERS 1314int fb_videomode_from_videomode(const struct videomode *vm, 1315 struct fb_videomode *fbmode) 1316{ 1317 unsigned int htotal, vtotal, total; 1318 1319 fbmode->xres = vm->hactive; 1320 fbmode->left_margin = vm->hback_porch; 1321 fbmode->right_margin = vm->hfront_porch; 1322 fbmode->hsync_len = vm->hsync_len; 1323 1324 fbmode->yres = vm->vactive; 1325 fbmode->upper_margin = vm->vback_porch; 1326 fbmode->lower_margin = vm->vfront_porch; 1327 fbmode->vsync_len = vm->vsync_len; 1328 1329 /* prevent division by zero in KHZ2PICOS macro */ 1330 fbmode->pixclock = vm->pixelclock ? 1331 KHZ2PICOS(vm->pixelclock / 1000) : 0; 1332 1333 fbmode->sync = 0; 1334 fbmode->vmode = 0; 1335 if (vm->flags & DISPLAY_FLAGS_HSYNC_HIGH) 1336 fbmode->sync |= FB_SYNC_HOR_HIGH_ACT; 1337 if (vm->flags & DISPLAY_FLAGS_VSYNC_HIGH) 1338 fbmode->sync |= FB_SYNC_VERT_HIGH_ACT; 1339 if (vm->flags & DISPLAY_FLAGS_INTERLACED) 1340 fbmode->vmode |= FB_VMODE_INTERLACED; 1341 if (vm->flags & DISPLAY_FLAGS_DOUBLESCAN) 1342 fbmode->vmode |= FB_VMODE_DOUBLE; 1343 fbmode->flag = 0; 1344 1345 htotal = vm->hactive + vm->hfront_porch + vm->hback_porch + 1346 vm->hsync_len; 1347 vtotal = vm->vactive + vm->vfront_porch + vm->vback_porch + 1348 vm->vsync_len; 1349 /* prevent division by zero */ 1350 total = htotal * vtotal; 1351 if (total) { 1352 fbmode->refresh = vm->pixelclock / total; 1353 /* a mode must have htotal and vtotal != 0 or it is invalid */ 1354 } else { 1355 fbmode->refresh = 0; 1356 return -EINVAL; 1357 } 1358 1359 return 0; 1360} 1361EXPORT_SYMBOL_GPL(fb_videomode_from_videomode); 1362 1363#ifdef CONFIG_OF 1364static inline void dump_fb_videomode(const struct fb_videomode *m) 1365{ 1366 pr_debug("fb_videomode = %ux%u@%uHz (%ukHz) %u %u %u %u %u %u %u %u %u\n", 1367 m->xres, m->yres, m->refresh, m->pixclock, m->left_margin, 1368 m->right_margin, m->upper_margin, m->lower_margin, 1369 m->hsync_len, m->vsync_len, m->sync, m->vmode, m->flag); 1370} 1371 1372/** 1373 * of_get_fb_videomode - get a fb_videomode from devicetree 1374 * @np: device_node with the timing specification 1375 * @fb: will be set to the return value 1376 * @index: index into the list of display timings in devicetree 1377 * 1378 * DESCRIPTION: 1379 * This function is expensive and should only be used, if only one mode is to be 1380 * read from DT. To get multiple modes start with of_get_display_timings ond 1381 * work with that instead. 1382 */ 1383int of_get_fb_videomode(struct device_node *np, struct fb_videomode *fb, 1384 int index) 1385{ 1386 struct videomode vm; 1387 int ret; 1388 1389 ret = of_get_videomode(np, &vm, index); 1390 if (ret) 1391 return ret; 1392 1393 ret = fb_videomode_from_videomode(&vm, fb); 1394 if (ret) 1395 return ret; 1396 1397 pr_debug("%pOF: got %dx%d display mode\n", 1398 np, vm.hactive, vm.vactive); 1399 dump_fb_videomode(fb); 1400 1401 return 0; 1402} 1403EXPORT_SYMBOL_GPL(of_get_fb_videomode); 1404#endif /* CONFIG_OF */ 1405#endif /* CONFIG_VIDEOMODE_HELPERS */ 1406 1407#else 1408int fb_parse_edid(unsigned char *edid, struct fb_var_screeninfo *var) 1409{ 1410 return 1; 1411} 1412void fb_edid_to_monspecs(unsigned char *edid, struct fb_monspecs *specs) 1413{ 1414} 1415void fb_destroy_modedb(struct fb_videomode *modedb) 1416{ 1417} 1418int fb_get_mode(int flags, u32 val, struct fb_var_screeninfo *var, 1419 struct fb_info *info) 1420{ 1421 return -EINVAL; 1422} 1423#endif /* CONFIG_FB_MODE_HELPERS */ 1424 1425/* 1426 * fb_validate_mode - validates var against monitor capabilities 1427 * @var: pointer to fb_var_screeninfo 1428 * @info: pointer to fb_info 1429 * 1430 * DESCRIPTION: 1431 * Validates video mode against monitor capabilities specified in 1432 * info->monspecs. 1433 * 1434 * REQUIRES: 1435 * A valid info->monspecs. 1436 */ 1437int fb_validate_mode(const struct fb_var_screeninfo *var, struct fb_info *info) 1438{ 1439 u32 hfreq, vfreq, htotal, vtotal, pixclock; 1440 u32 hfmin, hfmax, vfmin, vfmax, dclkmin, dclkmax; 1441 1442 /* 1443 * If monspecs are invalid, use values that are enough 1444 * for 640x480@60 1445 */ 1446 if (!info->monspecs.hfmax || !info->monspecs.vfmax || 1447 !info->monspecs.dclkmax || 1448 info->monspecs.hfmax < info->monspecs.hfmin || 1449 info->monspecs.vfmax < info->monspecs.vfmin || 1450 info->monspecs.dclkmax < info->monspecs.dclkmin) { 1451 hfmin = 29000; hfmax = 30000; 1452 vfmin = 60; vfmax = 60; 1453 dclkmin = 0; dclkmax = 25000000; 1454 } else { 1455 hfmin = info->monspecs.hfmin; 1456 hfmax = info->monspecs.hfmax; 1457 vfmin = info->monspecs.vfmin; 1458 vfmax = info->monspecs.vfmax; 1459 dclkmin = info->monspecs.dclkmin; 1460 dclkmax = info->monspecs.dclkmax; 1461 } 1462 1463 if (!var->pixclock) 1464 return -EINVAL; 1465 pixclock = PICOS2KHZ(var->pixclock) * 1000; 1466 1467 htotal = var->xres + var->right_margin + var->hsync_len + 1468 var->left_margin; 1469 vtotal = var->yres + var->lower_margin + var->vsync_len + 1470 var->upper_margin; 1471 1472 if (var->vmode & FB_VMODE_INTERLACED) 1473 vtotal /= 2; 1474 if (var->vmode & FB_VMODE_DOUBLE) 1475 vtotal *= 2; 1476 1477 hfreq = pixclock/htotal; 1478 hfreq = (hfreq + 500) / 1000 * 1000; 1479 1480 vfreq = hfreq/vtotal; 1481 1482 return (vfreq < vfmin || vfreq > vfmax || 1483 hfreq < hfmin || hfreq > hfmax || 1484 pixclock < dclkmin || pixclock > dclkmax) ? 1485 -EINVAL : 0; 1486} 1487 1488/* 1489 * We need to ensure that the EDID block is only returned for 1490 * the primary graphics adapter. 1491 */ 1492 1493#if defined(CONFIG_FIRMWARE_EDID) 1494const unsigned char *fb_firmware_edid(struct device *device) 1495{ 1496 struct pci_dev *dev = NULL; 1497 struct resource *res = NULL; 1498 unsigned char *edid = NULL; 1499 1500 if (device) 1501 dev = to_pci_dev(device); 1502 1503 if (dev) 1504 res = &dev->resource[PCI_ROM_RESOURCE]; 1505 1506 if (res && res->flags & IORESOURCE_ROM_SHADOW) 1507 edid = edid_info.dummy; 1508 1509 return edid; 1510} 1511#else 1512const unsigned char *fb_firmware_edid(struct device *device) 1513{ 1514 return NULL; 1515} 1516#endif 1517EXPORT_SYMBOL(fb_firmware_edid); 1518 1519EXPORT_SYMBOL(fb_parse_edid); 1520EXPORT_SYMBOL(fb_edid_to_monspecs); 1521EXPORT_SYMBOL(fb_get_mode); 1522EXPORT_SYMBOL(fb_validate_mode); 1523EXPORT_SYMBOL(fb_destroy_modedb);
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