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1/*2 * linux/drivers/video/fbmon.c3 *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 Architecture11 * Copyright (C) 1991-2002 SciTech Software, Inc. All rights reserved.12 *13 * 2. XFree86 4.3.0, interpret_edid.c14 * Copyright 1998 by Egbert Eich <Egbert.Eich@Physik.TU-Darmstadt.DE>15 *16 * 3. John Fremlin <vii@users.sourceforge.net> and17 * 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.org23 *24 * This file is subject to the terms and conditions of the GNU General Public25 * License. See the file COPYING in the main directory of this archive26 * 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 parser40 */41 42#undef DEBUG /* define this for verbose EDID parsing output */43 44#ifdef DEBUG45#define DPRINTK(fmt, args...) printk(fmt,## args)46#else47#define DPRINTK(fmt, args...) no_printk(fmt, ##args)48#endif49 50#define FBMON_FIX_HEADER 151#define FBMON_FIX_INPUT 252#define FBMON_FIX_TIMINGS 353 54#ifdef CONFIG_FB_MODE_HELPERS55struct broken_edid {56 u8 manufacturer[4];57 u32 model;58 u32 fix;59};60 61static 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 82static const unsigned char edid_v1_header[] = { 0x00, 0xff, 0xff, 0xff,83 0xff, 0xff, 0xff, 0x0084};85 86static void copy_string(unsigned char *c, unsigned char *s)87{88 int i;89 c = c + 5;90 for (i = 0; (i < 13 && *c != 0x0A); i++)91 *(s++) = *(c++);92 *s = 0;93 while (i-- && (*--s == 0x20)) *s = 0;94}95 96static int edid_is_serial_block(unsigned char *block)97{98 if ((block[0] == 0x00) && (block[1] == 0x00) &&99 (block[2] == 0x00) && (block[3] == 0xff) &&100 (block[4] == 0x00))101 return 1;102 else103 return 0;104}105 106static int edid_is_ascii_block(unsigned char *block)107{108 if ((block[0] == 0x00) && (block[1] == 0x00) &&109 (block[2] == 0x00) && (block[3] == 0xfe) &&110 (block[4] == 0x00))111 return 1;112 else113 return 0;114}115 116static int edid_is_limits_block(unsigned char *block)117{118 if ((block[0] == 0x00) && (block[1] == 0x00) &&119 (block[2] == 0x00) && (block[3] == 0xfd) &&120 (block[4] == 0x00))121 return 1;122 else123 return 0;124}125 126static int edid_is_monitor_block(unsigned char *block)127{128 if ((block[0] == 0x00) && (block[1] == 0x00) &&129 (block[2] == 0x00) && (block[3] == 0xfc) &&130 (block[4] == 0x00))131 return 1;132 else133 return 0;134}135 136static int edid_is_timing_block(unsigned char *block)137{138 if ((block[0] != 0x00) || (block[1] != 0x00) ||139 (block[2] != 0x00) || (block[4] != 0x00))140 return 1;141 else142 return 0;143}144 145static int check_edid(unsigned char *edid)146{147 unsigned char *block = edid + ID_MANUFACTURER_NAME, manufacturer[4];148 unsigned char *b;149 u32 model;150 int i, fix = 0, ret = 0;151 152 manufacturer[0] = ((block[0] & 0x7c) >> 2) + '@';153 manufacturer[1] = ((block[0] & 0x03) << 3) +154 ((block[1] & 0xe0) >> 5) + '@';155 manufacturer[2] = (block[1] & 0x1f) + '@';156 manufacturer[3] = 0;157 model = block[2] + (block[3] << 8);158 159 for (i = 0; i < ARRAY_SIZE(brokendb); i++) {160 if (!strncmp(manufacturer, brokendb[i].manufacturer, 4) &&161 brokendb[i].model == model) {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 will179 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 207static 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 256static 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 277static int edid_check_header(unsigned char *edid)278{279 int i, err = 1, fix = check_edid(edid);280 281 if (fix)282 fix_edid(edid, fix);283 284 for (i = 0; i < 8; i++) {285 if (edid[i] != edid_v1_header[i])286 err = 0;287 }288 289 return err;290}291 292static void parse_vendor_block(unsigned char *block, struct fb_monspecs *specs)293{294 specs->manufacturer[0] = ((block[0] & 0x7c) >> 2) + '@';295 specs->manufacturer[1] = ((block[0] & 0x03) << 3) +296 ((block[1] & 0xe0) >> 5) + '@';297 specs->manufacturer[2] = (block[1] & 0x1f) + '@';298 specs->manufacturer[3] = 0;299 specs->model = block[2] + (block[3] << 8);300 specs->serial = block[4] + (block[5] << 8) +301 (block[6] << 16) + (block[7] << 24);302 specs->year = block[9] + 1990;303 specs->week = block[8];304 DPRINTK(" Manufacturer: %s\n", specs->manufacturer);305 DPRINTK(" Model: %x\n", specs->model);306 DPRINTK(" Serial#: %u\n", specs->serial);307 DPRINTK(" Year: %u Week %u\n", specs->year, specs->week);308}309 310static void get_dpms_capabilities(unsigned char flags,311 struct fb_monspecs *specs)312{313 specs->dpms = 0;314 if (flags & DPMS_ACTIVE_OFF)315 specs->dpms |= FB_DPMS_ACTIVE_OFF;316 if (flags & DPMS_SUSPEND)317 specs->dpms |= FB_DPMS_SUSPEND;318 if (flags & DPMS_STANDBY)319 specs->dpms |= FB_DPMS_STANDBY;320 DPRINTK(" DPMS: Active %s, Suspend %s, Standby %s\n",321 (flags & DPMS_ACTIVE_OFF) ? "yes" : "no",322 (flags & DPMS_SUSPEND) ? "yes" : "no",323 (flags & DPMS_STANDBY) ? "yes" : "no");324}325 326static void get_chroma(unsigned char *block, struct fb_monspecs *specs)327{328 int tmp;329 330 DPRINTK(" Chroma\n");331 /* Chromaticity data */332 tmp = ((block[5] & (3 << 6)) >> 6) | (block[0x7] << 2);333 tmp *= 1000;334 tmp += 512;335 specs->chroma.redx = tmp/1024;336 DPRINTK(" RedX: 0.%03d ", specs->chroma.redx);337 338 tmp = ((block[5] & (3 << 4)) >> 4) | (block[0x8] << 2);339 tmp *= 1000;340 tmp += 512;341 specs->chroma.redy = tmp/1024;342 DPRINTK("RedY: 0.%03d\n", specs->chroma.redy);343 344 tmp = ((block[5] & (3 << 2)) >> 2) | (block[0x9] << 2);345 tmp *= 1000;346 tmp += 512;347 specs->chroma.greenx = tmp/1024;348 DPRINTK(" GreenX: 0.%03d ", specs->chroma.greenx);349 350 tmp = (block[5] & 3) | (block[0xa] << 2);351 tmp *= 1000;352 tmp += 512;353 specs->chroma.greeny = tmp/1024;354 DPRINTK("GreenY: 0.%03d\n", specs->chroma.greeny);355 356 tmp = ((block[6] & (3 << 6)) >> 6) | (block[0xb] << 2);357 tmp *= 1000;358 tmp += 512;359 specs->chroma.bluex = tmp/1024;360 DPRINTK(" BlueX: 0.%03d ", specs->chroma.bluex);361 362 tmp = ((block[6] & (3 << 4)) >> 4) | (block[0xc] << 2);363 tmp *= 1000;364 tmp += 512;365 specs->chroma.bluey = tmp/1024;366 DPRINTK("BlueY: 0.%03d\n", specs->chroma.bluey);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 381static 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 409static int get_est_timing(unsigned char *block, struct fb_videomode *mode)410{411 int num = 0;412 unsigned char c;413 414 c = block[0];415 if (c&0x80) {416 calc_mode_timings(720, 400, 70, &mode[num]);417 mode[num++].flag = FB_MODE_IS_CALCULATED;418 DPRINTK(" 720x400@70Hz\n");419 }420 if (c&0x40) {421 calc_mode_timings(720, 400, 88, &mode[num]);422 mode[num++].flag = FB_MODE_IS_CALCULATED;423 DPRINTK(" 720x400@88Hz\n");424 }425 if (c&0x20) {426 mode[num++] = vesa_modes[3];427 DPRINTK(" 640x480@60Hz\n");428 }429 if (c&0x10) {430 calc_mode_timings(640, 480, 67, &mode[num]);431 mode[num++].flag = FB_MODE_IS_CALCULATED;432 DPRINTK(" 640x480@67Hz\n");433 }434 if (c&0x08) {435 mode[num++] = vesa_modes[4];436 DPRINTK(" 640x480@72Hz\n");437 }438 if (c&0x04) {439 mode[num++] = vesa_modes[5];440 DPRINTK(" 640x480@75Hz\n");441 }442 if (c&0x02) {443 mode[num++] = vesa_modes[7];444 DPRINTK(" 800x600@56Hz\n");445 }446 if (c&0x01) {447 mode[num++] = vesa_modes[8];448 DPRINTK(" 800x600@60Hz\n");449 }450 451 c = block[1];452 if (c&0x80) {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 494static 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 else525 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->dclkmax545 && PICOS2KHZ(mode->pixclock) * 1000 > specs->dclkmax) {546 DPRINTK(" mode exceed max DCLK\n");547 return 0;548 }549 550 return 1;551}552 553static 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 564static 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 database606 * @edid: EDID data607 * @dbsize: database size608 * @specs: monitor specifications, may be NULL609 *610 * RETURNS: struct fb_videomode, @dbsize contains length of database611 *612 * DESCRIPTION:613 * This function builds a mode database using the contents of the EDID614 * data615 */616static 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 database685 * @modedb: mode database to destroy686 *687 * DESCRIPTION:688 * Destroy mode database created by fb_create_modedb689 */690void fb_destroy_modedb(struct fb_videomode *modedb)691{692 kfree(modedb);693}694 695static 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_len735 + mode->left_margin;736 vtotal = mode->yres + mode->lower_margin + mode->vsync_len737 + 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 776static 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 else843 DPRINTK("variable\n");844 DPRINTK(" Max V-size in cm: ");845 if (specs->max_y)846 DPRINTK("%d\n", specs->max_y);847 else848 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 894int 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 937void 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 first987 * detailed timing is preferred but has not detailed988 * timing specified989 */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 5501008#define V_FRONTPORCH 11009#define H_OFFSET 401010#define H_SCALEFACTOR 201011#define H_BLANKSCALE 1281012#define H_GRADIENT 6001013#define C_VAL 301014#define M_VAL 3001015 1016struct __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 time1030 * @hfreq: horizontal freq1031 *1032 * DESCRIPTION:1033 * vblank = right_margin + vsync_len + left_margin1034 *1035 * given: right_margin = 1 (V_FRONTPORCH)1036 * vsync_len = 31037 * flyback = 5501038 *1039 * flyback * hfreq1040 * left_margin = --------------- - vsync_len1041 * 10000001042 */1043static 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_hfreq - get horizontal blank time given hfreq1054 * @hfreq: horizontal freq1055 * @xres: horizontal resolution in pixels1056 *1057 * DESCRIPTION:1058 *1059 * xres * duty_cycle1060 * hblank = ------------------1061 * 100 - duty_cycle1062 *1063 * duty cycle = percent of htotal assigned to inactive display1064 * duty cycle = C - (M/Hfreq)1065 *1066 * where: C = ((offset - scale factor) * blank_scale)1067 * -------------------------------------- + scale factor1068 * 2561069 * M = blank_scale * gradient1070 *1071 */1072static 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 pixelclock1087 * @dclk: pixelclock in Hz1088 * @xres: horizontal resolution in pixels1089 *1090 * DESCRIPTION:1091 *1092 * xres * duty_cycle1093 * hblank = ------------------1094 * 100 - duty_cycle1095 *1096 * duty cycle = percent of htotal assigned to inactive display1097 * duty cycle = C - (M * h_period)1098 *1099 * where: h_period = SQRT(100 - C + (0.4 * xres * M)/dclk) + C - 1001100 * -----------------------------------------------1101 * 2 * M1102 * M = 300;1103 * C = 30;1104 */1105static 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 hsync1128 * @vfreq: vertical refresh rate1129 * @yres: vertical resolution1130 *1131 * DESCRIPTION:1132 *1133 * (yres + front_port) * vfreq * 10000001134 * hfreq = -------------------------------------1135 * (1000000 - (vfreq * FLYBACK)1136 *1137 */1138 1139static 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 1148static 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 1159static 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 1170static 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 GTF1183 * @flags: if: 0 - maximize vertical refresh rate1184 * 1 - vrefresh-driven calculation;1185 * 2 - hscan-driven calculation;1186 * 3 - pixelclock-driven calculation;1187 * @val: depending on @flags, ignored, vrefresh, hsync or pixelclock1188 * @var: pointer to fb_var_screeninfo1189 * @info: pointer to fb_info1190 *1191 * DESCRIPTION:1192 * Calculates video mode based on monitor specs using VESA GTF.1193 * The GTF is best for VESA GTF compliant monitors but is1194 * specifically formulated to work for older monitors as well.1195 *1196 * If @flag==0, the function will attempt to maximize the1197 * refresh rate. Otherwise, it will calculate timings based on1198 * the flag and accompanying value.1199 *1200 * If FB_IGNOREMON bit is set in @flags, monitor specs will be1201 * ignored and @var will be filled with the calculated timings.1202 *1203 * All calculations are based on the VESA GTF Spreadsheet1204 * available at VESA's public ftp (https://www.vesa.org).1205 *1206 * NOTES:1207 * The timings generated by the GTF will be different from VESA1208 * DMT. It might be a good idea to keep a table of standard1209 * 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 */1215int 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 enough1229 * for 640x480@601230 */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_HELPERS1311int fb_videomode_from_videomode(const struct videomode *vm,1312 struct fb_videomode *fbmode)1313{1314 unsigned int htotal, vtotal, total;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 total = htotal * vtotal;1348 if (total) {1349 fbmode->refresh = vm->pixelclock / total;1350 /* a mode must have htotal and vtotal != 0 or it is invalid */1351 } else {1352 fbmode->refresh = 0;1353 return -EINVAL;1354 }1355 1356 return 0;1357}1358EXPORT_SYMBOL_GPL(fb_videomode_from_videomode);1359 1360#ifdef CONFIG_OF1361static inline void dump_fb_videomode(const struct fb_videomode *m)1362{1363 pr_debug("fb_videomode = %ux%u@%uHz (%ukHz) %u %u %u %u %u %u %u %u %u\n",1364 m->xres, m->yres, m->refresh, m->pixclock, m->left_margin,1365 m->right_margin, m->upper_margin, m->lower_margin,1366 m->hsync_len, m->vsync_len, m->sync, m->vmode, m->flag);1367}1368 1369/**1370 * of_get_fb_videomode - get a fb_videomode from devicetree1371 * @np: device_node with the timing specification1372 * @fb: will be set to the return value1373 * @index: index into the list of display timings in devicetree1374 *1375 * DESCRIPTION:1376 * This function is expensive and should only be used, if only one mode is to be1377 * read from DT. To get multiple modes start with of_get_display_timings ond1378 * work with that instead.1379 */1380int of_get_fb_videomode(struct device_node *np, struct fb_videomode *fb,1381 int index)1382{1383 struct videomode vm;1384 int ret;1385 1386 ret = of_get_videomode(np, &vm, index);1387 if (ret)1388 return ret;1389 1390 ret = fb_videomode_from_videomode(&vm, fb);1391 if (ret)1392 return ret;1393 1394 pr_debug("%pOF: got %dx%d display mode\n",1395 np, vm.hactive, vm.vactive);1396 dump_fb_videomode(fb);1397 1398 return 0;1399}1400EXPORT_SYMBOL_GPL(of_get_fb_videomode);1401#endif /* CONFIG_OF */1402#endif /* CONFIG_VIDEOMODE_HELPERS */1403 1404#else1405int fb_parse_edid(unsigned char *edid, struct fb_var_screeninfo *var)1406{1407 return 1;1408}1409void fb_edid_to_monspecs(unsigned char *edid, struct fb_monspecs *specs)1410{1411}1412void fb_destroy_modedb(struct fb_videomode *modedb)1413{1414}1415int fb_get_mode(int flags, u32 val, struct fb_var_screeninfo *var,1416 struct fb_info *info)1417{1418 return -EINVAL;1419}1420#endif /* CONFIG_FB_MODE_HELPERS */1421 1422/*1423 * fb_validate_mode - validates var against monitor capabilities1424 * @var: pointer to fb_var_screeninfo1425 * @info: pointer to fb_info1426 *1427 * DESCRIPTION:1428 * Validates video mode against monitor capabilities specified in1429 * info->monspecs.1430 *1431 * REQUIRES:1432 * A valid info->monspecs.1433 */1434int fb_validate_mode(const struct fb_var_screeninfo *var, struct fb_info *info)1435{1436 u32 hfreq, vfreq, htotal, vtotal, pixclock;1437 u32 hfmin, hfmax, vfmin, vfmax, dclkmin, dclkmax;1438 1439 /*1440 * If monspecs are invalid, use values that are enough1441 * for 640x480@601442 */1443 if (!info->monspecs.hfmax || !info->monspecs.vfmax ||1444 !info->monspecs.dclkmax ||1445 info->monspecs.hfmax < info->monspecs.hfmin ||1446 info->monspecs.vfmax < info->monspecs.vfmin ||1447 info->monspecs.dclkmax < info->monspecs.dclkmin) {1448 hfmin = 29000; hfmax = 30000;1449 vfmin = 60; vfmax = 60;1450 dclkmin = 0; dclkmax = 25000000;1451 } else {1452 hfmin = info->monspecs.hfmin;1453 hfmax = info->monspecs.hfmax;1454 vfmin = info->monspecs.vfmin;1455 vfmax = info->monspecs.vfmax;1456 dclkmin = info->monspecs.dclkmin;1457 dclkmax = info->monspecs.dclkmax;1458 }1459 1460 if (!var->pixclock)1461 return -EINVAL;1462 pixclock = PICOS2KHZ(var->pixclock) * 1000;1463 1464 htotal = var->xres + var->right_margin + var->hsync_len +1465 var->left_margin;1466 vtotal = var->yres + var->lower_margin + var->vsync_len +1467 var->upper_margin;1468 1469 if (var->vmode & FB_VMODE_INTERLACED)1470 vtotal /= 2;1471 if (var->vmode & FB_VMODE_DOUBLE)1472 vtotal *= 2;1473 1474 hfreq = pixclock/htotal;1475 hfreq = (hfreq + 500) / 1000 * 1000;1476 1477 vfreq = hfreq/vtotal;1478 1479 return (vfreq < vfmin || vfreq > vfmax ||1480 hfreq < hfmin || hfreq > hfmax ||1481 pixclock < dclkmin || pixclock > dclkmax) ?1482 -EINVAL : 0;1483}1484 1485#if defined(CONFIG_FIRMWARE_EDID) && defined(CONFIG_X86)1486 1487/*1488 * We need to ensure that the EDID block is only returned for1489 * the primary graphics adapter.1490 */1491 1492const unsigned char *fb_firmware_edid(struct device *device)1493{1494 struct pci_dev *dev = NULL;1495 struct resource *res = NULL;1496 unsigned char *edid = NULL;1497 1498 if (device)1499 dev = to_pci_dev(device);1500 1501 if (dev)1502 res = &dev->resource[PCI_ROM_RESOURCE];1503 1504 if (res && res->flags & IORESOURCE_ROM_SHADOW)1505 edid = edid_info.dummy;1506 1507 return edid;1508}1509#else1510const unsigned char *fb_firmware_edid(struct device *device)1511{1512 return NULL;1513}1514#endif1515EXPORT_SYMBOL(fb_firmware_edid);1516 1517EXPORT_SYMBOL(fb_parse_edid);1518EXPORT_SYMBOL(fb_edid_to_monspecs);1519EXPORT_SYMBOL(fb_get_mode);1520EXPORT_SYMBOL(fb_validate_mode);1521EXPORT_SYMBOL(fb_destroy_modedb);1522