2 * linux/drivers/video/fbmon.c
4 * Copyright (C) 2002 James Simmons <jsimmons@users.sf.net>
8 * The EDID Parser is a conglomeration from the following sources:
10 * 1. SciTech SNAP Graphics Architecture
11 * Copyright (C) 1991-2002 SciTech Software, Inc. All rights reserved.
13 * 2. XFree86 4.3.0, interpret_edid.c
14 * Copyright 1998 by Egbert Eich <Egbert.Eich@Physik.TU-Darmstadt.DE>
16 * 3. John Fremlin <vii@users.sourceforge.net> and
17 * Ani Joshi <ajoshi@unixbox.com>
19 * Generalized Timing Formula is derived from:
21 * GTF Spreadsheet by Andy Morrish (1/5/97)
22 * available at http://www.vesa.org
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
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>
38 #include <asm/pci-bridge.h>
46 #undef DEBUG /* define this for verbose EDID parsing output */
49 #define DPRINTK(fmt, args...) printk(fmt,## args)
51 #define DPRINTK(fmt, args...)
54 #define FBMON_FIX_HEADER 1
55 #define FBMON_FIX_INPUT 2
56 #define FBMON_FIX_TIMINGS 3
58 #ifdef CONFIG_FB_MODE_HELPERS
65 static const struct broken_edid brokendb[] = {
68 .manufacturer = "DEC",
70 .fix = FBMON_FIX_HEADER,
72 /* ViewSonic PF775a */
74 .manufacturer = "VSC",
76 .fix = FBMON_FIX_INPUT,
80 .manufacturer = "SHP",
82 .fix = FBMON_FIX_TIMINGS,
86 static const unsigned char edid_v1_header[] = { 0x00, 0xff, 0xff, 0xff,
87 0xff, 0xff, 0xff, 0x00
90 static void copy_string(unsigned char *c, unsigned char *s)
94 for (i = 0; (i < 13 && *c != 0x0A); i++)
97 while (i-- && (*--s == 0x20)) *s = 0;
100 static int edid_is_serial_block(unsigned char *block)
102 if ((block[0] == 0x00) && (block[1] == 0x00) &&
103 (block[2] == 0x00) && (block[3] == 0xff) &&
110 static int edid_is_ascii_block(unsigned char *block)
112 if ((block[0] == 0x00) && (block[1] == 0x00) &&
113 (block[2] == 0x00) && (block[3] == 0xfe) &&
120 static int edid_is_limits_block(unsigned char *block)
122 if ((block[0] == 0x00) && (block[1] == 0x00) &&
123 (block[2] == 0x00) && (block[3] == 0xfd) &&
130 static int edid_is_monitor_block(unsigned char *block)
132 if ((block[0] == 0x00) && (block[1] == 0x00) &&
133 (block[2] == 0x00) && (block[3] == 0xfc) &&
140 static int edid_is_timing_block(unsigned char *block)
142 if ((block[0] != 0x00) || (block[1] != 0x00) ||
143 (block[2] != 0x00) || (block[4] != 0x00))
149 static int check_edid(unsigned char *edid)
151 unsigned char *block = edid + ID_MANUFACTURER_NAME, manufacturer[4];
154 int i, fix = 0, ret = 0;
156 manufacturer[0] = ((block[0] & 0x7c) >> 2) + '@';
157 manufacturer[1] = ((block[0] & 0x03) << 3) +
158 ((block[1] & 0xe0) >> 5) + '@';
159 manufacturer[2] = (block[1] & 0x1f) + '@';
161 model = block[2] + (block[3] << 8);
163 for (i = 0; i < ARRAY_SIZE(brokendb); i++) {
164 if (!strncmp(manufacturer, brokendb[i].manufacturer, 4) &&
165 brokendb[i].model == model) {
166 fix = brokendb[i].fix;
172 case FBMON_FIX_HEADER:
173 for (i = 0; i < 8; i++) {
174 if (edid[i] != edid_v1_header[i]) {
180 case FBMON_FIX_INPUT:
181 b = edid + EDID_STRUCT_DISPLAY;
182 /* Only if display is GTF capable will
183 the input type be reset to analog */
184 if (b[4] & 0x01 && b[0] & 0x80)
187 case FBMON_FIX_TIMINGS:
188 b = edid + DETAILED_TIMING_DESCRIPTIONS_START;
191 for (i = 0; i < 4; i++) {
192 if (edid_is_limits_block(b)) {
197 b += DETAILED_TIMING_DESCRIPTION_SIZE;
204 printk("fbmon: The EDID Block of "
205 "Manufacturer: %s Model: 0x%x is known to "
206 "be broken,\n", manufacturer, model);
211 static void fix_edid(unsigned char *edid, int fix)
214 unsigned char *b, csum = 0;
217 case FBMON_FIX_HEADER:
218 printk("fbmon: trying a header reconstruct\n");
219 memcpy(edid, edid_v1_header, 8);
221 case FBMON_FIX_INPUT:
222 printk("fbmon: trying to fix input type\n");
223 b = edid + EDID_STRUCT_DISPLAY;
227 case FBMON_FIX_TIMINGS:
228 printk("fbmon: trying to fix monitor timings\n");
229 b = edid + DETAILED_TIMING_DESCRIPTIONS_START;
230 for (i = 0; i < 4; i++) {
231 if (!(edid_is_serial_block(b) ||
232 edid_is_ascii_block(b) ||
233 edid_is_monitor_block(b) ||
234 edid_is_timing_block(b))) {
240 b[5] = 60; /* vfmin */
241 b[6] = 60; /* vfmax */
242 b[7] = 30; /* hfmin */
243 b[8] = 75; /* hfmax */
244 b[9] = 17; /* pixclock - 170 MHz*/
249 b += DETAILED_TIMING_DESCRIPTION_SIZE;
252 for (i = 0; i < EDID_LENGTH - 1; i++)
255 edid[127] = 256 - csum;
260 static int edid_checksum(unsigned char *edid)
262 unsigned char csum = 0, all_null = 0;
263 int i, err = 0, fix = check_edid(edid);
268 for (i = 0; i < EDID_LENGTH; i++) {
273 if (csum == 0x00 && all_null) {
274 /* checksum passed, everything's good */
281 static int edid_check_header(unsigned char *edid)
283 int i, err = 1, fix = check_edid(edid);
288 for (i = 0; i < 8; i++) {
289 if (edid[i] != edid_v1_header[i])
296 static void parse_vendor_block(unsigned char *block, struct fb_monspecs *specs)
298 specs->manufacturer[0] = ((block[0] & 0x7c) >> 2) + '@';
299 specs->manufacturer[1] = ((block[0] & 0x03) << 3) +
300 ((block[1] & 0xe0) >> 5) + '@';
301 specs->manufacturer[2] = (block[1] & 0x1f) + '@';
302 specs->manufacturer[3] = 0;
303 specs->model = block[2] + (block[3] << 8);
304 specs->serial = block[4] + (block[5] << 8) +
305 (block[6] << 16) + (block[7] << 24);
306 specs->year = block[9] + 1990;
307 specs->week = block[8];
308 DPRINTK(" Manufacturer: %s\n", specs->manufacturer);
309 DPRINTK(" Model: %x\n", specs->model);
310 DPRINTK(" Serial#: %u\n", specs->serial);
311 DPRINTK(" Year: %u Week %u\n", specs->year, specs->week);
314 static void get_dpms_capabilities(unsigned char flags,
315 struct fb_monspecs *specs)
318 if (flags & DPMS_ACTIVE_OFF)
319 specs->dpms |= FB_DPMS_ACTIVE_OFF;
320 if (flags & DPMS_SUSPEND)
321 specs->dpms |= FB_DPMS_SUSPEND;
322 if (flags & DPMS_STANDBY)
323 specs->dpms |= FB_DPMS_STANDBY;
324 DPRINTK(" DPMS: Active %s, Suspend %s, Standby %s\n",
325 (flags & DPMS_ACTIVE_OFF) ? "yes" : "no",
326 (flags & DPMS_SUSPEND) ? "yes" : "no",
327 (flags & DPMS_STANDBY) ? "yes" : "no");
330 static void get_chroma(unsigned char *block, struct fb_monspecs *specs)
334 DPRINTK(" Chroma\n");
335 /* Chromaticity data */
336 tmp = ((block[5] & (3 << 6)) >> 6) | (block[0x7] << 2);
339 specs->chroma.redx = tmp/1024;
340 DPRINTK(" RedX: 0.%03d ", specs->chroma.redx);
342 tmp = ((block[5] & (3 << 4)) >> 4) | (block[0x8] << 2);
345 specs->chroma.redy = tmp/1024;
346 DPRINTK("RedY: 0.%03d\n", specs->chroma.redy);
348 tmp = ((block[5] & (3 << 2)) >> 2) | (block[0x9] << 2);
351 specs->chroma.greenx = tmp/1024;
352 DPRINTK(" GreenX: 0.%03d ", specs->chroma.greenx);
354 tmp = (block[5] & 3) | (block[0xa] << 2);
357 specs->chroma.greeny = tmp/1024;
358 DPRINTK("GreenY: 0.%03d\n", specs->chroma.greeny);
360 tmp = ((block[6] & (3 << 6)) >> 6) | (block[0xb] << 2);
363 specs->chroma.bluex = tmp/1024;
364 DPRINTK(" BlueX: 0.%03d ", specs->chroma.bluex);
366 tmp = ((block[6] & (3 << 4)) >> 4) | (block[0xc] << 2);
369 specs->chroma.bluey = tmp/1024;
370 DPRINTK("BlueY: 0.%03d\n", specs->chroma.bluey);
372 tmp = ((block[6] & (3 << 2)) >> 2) | (block[0xd] << 2);
375 specs->chroma.whitex = tmp/1024;
376 DPRINTK(" WhiteX: 0.%03d ", specs->chroma.whitex);
378 tmp = (block[6] & 3) | (block[0xe] << 2);
381 specs->chroma.whitey = tmp/1024;
382 DPRINTK("WhiteY: 0.%03d\n", specs->chroma.whitey);
385 static void calc_mode_timings(int xres, int yres, int refresh,
386 struct fb_videomode *mode)
388 struct fb_var_screeninfo *var;
390 var = kzalloc(sizeof(struct fb_var_screeninfo), GFP_KERNEL);
395 fb_get_mode(FB_VSYNCTIMINGS | FB_IGNOREMON,
399 mode->pixclock = var->pixclock;
400 mode->refresh = refresh;
401 mode->left_margin = var->left_margin;
402 mode->right_margin = var->right_margin;
403 mode->upper_margin = var->upper_margin;
404 mode->lower_margin = var->lower_margin;
405 mode->hsync_len = var->hsync_len;
406 mode->vsync_len = var->vsync_len;
413 static int get_est_timing(unsigned char *block, struct fb_videomode *mode)
420 calc_mode_timings(720, 400, 70, &mode[num]);
421 mode[num++].flag = FB_MODE_IS_CALCULATED;
422 DPRINTK(" 720x400@70Hz\n");
425 calc_mode_timings(720, 400, 88, &mode[num]);
426 mode[num++].flag = FB_MODE_IS_CALCULATED;
427 DPRINTK(" 720x400@88Hz\n");
430 mode[num++] = vesa_modes[3];
431 DPRINTK(" 640x480@60Hz\n");
434 calc_mode_timings(640, 480, 67, &mode[num]);
435 mode[num++].flag = FB_MODE_IS_CALCULATED;
436 DPRINTK(" 640x480@67Hz\n");
439 mode[num++] = vesa_modes[4];
440 DPRINTK(" 640x480@72Hz\n");
443 mode[num++] = vesa_modes[5];
444 DPRINTK(" 640x480@75Hz\n");
447 mode[num++] = vesa_modes[7];
448 DPRINTK(" 800x600@56Hz\n");
451 mode[num++] = vesa_modes[8];
452 DPRINTK(" 800x600@60Hz\n");
457 mode[num++] = vesa_modes[9];
458 DPRINTK(" 800x600@72Hz\n");
461 mode[num++] = vesa_modes[10];
462 DPRINTK(" 800x600@75Hz\n");
465 calc_mode_timings(832, 624, 75, &mode[num]);
466 mode[num++].flag = FB_MODE_IS_CALCULATED;
467 DPRINTK(" 832x624@75Hz\n");
470 mode[num++] = vesa_modes[12];
471 DPRINTK(" 1024x768@87Hz Interlaced\n");
474 mode[num++] = vesa_modes[13];
475 DPRINTK(" 1024x768@60Hz\n");
478 mode[num++] = vesa_modes[14];
479 DPRINTK(" 1024x768@70Hz\n");
482 mode[num++] = vesa_modes[15];
483 DPRINTK(" 1024x768@75Hz\n");
486 mode[num++] = vesa_modes[21];
487 DPRINTK(" 1280x1024@75Hz\n");
491 mode[num++] = vesa_modes[17];
492 DPRINTK(" 1152x870@75Hz\n");
494 DPRINTK(" Manufacturer's mask: %x\n",c&0x7F);
498 static int get_std_timing(unsigned char *block, struct fb_videomode *mode,
499 int ver, int rev, const struct fb_monspecs *specs)
503 for (i = 0; i < DMT_SIZE; i++) {
504 u32 std_2byte_code = block[0] << 8 | block[1];
505 if (std_2byte_code == dmt_modes[i].std_2byte_code)
509 if (i < DMT_SIZE && dmt_modes[i].mode) {
511 *mode = *dmt_modes[i].mode;
512 mode->flag |= FB_MODE_IS_STANDARD;
513 DPRINTK(" DMT id=%d\n", dmt_modes[i].dmt_id);
516 int xres, yres = 0, refresh, ratio;
518 xres = (block[0] + 31) * 8;
522 ratio = (block[1] & 0xc0) >> 6;
525 /* in EDID 1.3 the meaning of 0 changed to 16:10 (prior 1:1) */
526 if (ver < 1 || (ver == 1 && rev < 3))
529 yres = (xres * 10)/16;
538 yres = (xres * 9)/16;
541 refresh = (block[1] & 0x3f) + 60;
542 DPRINTK(" %dx%d@%dHz\n", xres, yres, refresh);
544 calc_mode_timings(xres, yres, refresh, mode);
547 /* Check the mode we got is within valid spec of the monitor */
548 if (specs && specs->dclkmax
549 && PICOS2KHZ(mode->pixclock) * 1000 > specs->dclkmax) {
550 DPRINTK(" mode exceed max DCLK\n");
557 static int get_dst_timing(unsigned char *block, struct fb_videomode *mode,
558 int ver, int rev, const struct fb_monspecs *specs)
562 for (j = 0; j < 6; j++, block += STD_TIMING_DESCRIPTION_SIZE)
563 num += get_std_timing(block, &mode[num], ver, rev, specs);
568 static void get_detailed_timing(unsigned char *block,
569 struct fb_videomode *mode)
571 mode->xres = H_ACTIVE;
572 mode->yres = V_ACTIVE;
573 mode->pixclock = PIXEL_CLOCK;
574 mode->pixclock /= 1000;
575 mode->pixclock = KHZ2PICOS(mode->pixclock);
576 mode->right_margin = H_SYNC_OFFSET;
577 mode->left_margin = (H_ACTIVE + H_BLANKING) -
578 (H_ACTIVE + H_SYNC_OFFSET + H_SYNC_WIDTH);
579 mode->upper_margin = V_BLANKING - V_SYNC_OFFSET -
581 mode->lower_margin = V_SYNC_OFFSET;
582 mode->hsync_len = H_SYNC_WIDTH;
583 mode->vsync_len = V_SYNC_WIDTH;
585 mode->sync |= FB_SYNC_HOR_HIGH_ACT;
587 mode->sync |= FB_SYNC_VERT_HIGH_ACT;
588 mode->refresh = PIXEL_CLOCK/((H_ACTIVE + H_BLANKING) *
589 (V_ACTIVE + V_BLANKING));
592 mode->upper_margin *= 2;
593 mode->lower_margin *= 2;
594 mode->vsync_len *= 2;
595 mode->vmode |= FB_VMODE_INTERLACED;
597 mode->flag = FB_MODE_IS_DETAILED;
599 DPRINTK(" %d MHz ", PIXEL_CLOCK/1000000);
600 DPRINTK("%d %d %d %d ", H_ACTIVE, H_ACTIVE + H_SYNC_OFFSET,
601 H_ACTIVE + H_SYNC_OFFSET + H_SYNC_WIDTH, H_ACTIVE + H_BLANKING);
602 DPRINTK("%d %d %d %d ", V_ACTIVE, V_ACTIVE + V_SYNC_OFFSET,
603 V_ACTIVE + V_SYNC_OFFSET + V_SYNC_WIDTH, V_ACTIVE + V_BLANKING);
604 DPRINTK("%sHSync %sVSync\n\n", (HSYNC_POSITIVE) ? "+" : "-",
605 (VSYNC_POSITIVE) ? "+" : "-");
609 * fb_create_modedb - create video mode database
611 * @dbsize: database size
613 * RETURNS: struct fb_videomode, @dbsize contains length of database
616 * This function builds a mode database using the contents of the EDID
619 static struct fb_videomode *fb_create_modedb(unsigned char *edid, int *dbsize,
620 const struct fb_monspecs *specs)
622 struct fb_videomode *mode, *m;
623 unsigned char *block;
624 int num = 0, i, first = 1;
627 mode = kzalloc(50 * sizeof(struct fb_videomode), GFP_KERNEL);
631 if (edid == NULL || !edid_checksum(edid) ||
632 !edid_check_header(edid)) {
637 ver = edid[EDID_STRUCT_VERSION];
638 rev = edid[EDID_STRUCT_REVISION];
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]);
648 mode[num].flag |= FB_MODE_IS_FIRST;
655 DPRINTK(" Supported VESA Modes\n");
656 block = edid + ESTABLISHED_TIMING_1;
657 num += get_est_timing(block, &mode[num]);
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);
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],
671 /* Yikes, EDID data is totally useless */
678 m = kmalloc(num * sizeof(struct fb_videomode), GFP_KERNEL);
681 memmove(m, mode, num * sizeof(struct fb_videomode));
687 * fb_destroy_modedb - destroys mode database
688 * @modedb: mode database to destroy
691 * Destroy mode database created by fb_create_modedb
693 void fb_destroy_modedb(struct fb_videomode *modedb)
698 static int fb_get_monitor_limits(unsigned char *edid, struct fb_monspecs *specs)
701 unsigned char *block;
703 block = edid + DETAILED_TIMING_DESCRIPTIONS_START;
705 DPRINTK(" Monitor Operating Limits: ");
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;
716 DPRINTK("From EDID\n");
721 /* estimate monitor limits based on modes supported */
723 struct fb_videomode *modes, *mode;
724 int num_modes, hz, hscan, pixclock;
727 modes = fb_create_modedb(edid, &num_modes, specs);
729 DPRINTK("None Available\n");
734 for (i = 0; i < num_modes; i++) {
736 pixclock = PICOS2KHZ(modes[i].pixclock) * 1000;
737 htotal = mode->xres + mode->right_margin + mode->hsync_len
739 vtotal = mode->yres + mode->lower_margin + mode->vsync_len
740 + mode->upper_margin;
742 if (mode->vmode & FB_VMODE_INTERLACED)
745 if (mode->vmode & FB_VMODE_DOUBLE)
748 hscan = (pixclock + htotal / 2) / htotal;
749 hscan = (hscan + 500) / 1000 * 1000;
750 hz = (hscan + vtotal / 2) / vtotal;
752 if (specs->dclkmax == 0 || specs->dclkmax < pixclock)
753 specs->dclkmax = pixclock;
755 if (specs->dclkmin == 0 || specs->dclkmin > pixclock)
756 specs->dclkmin = pixclock;
758 if (specs->hfmax == 0 || specs->hfmax < hscan)
759 specs->hfmax = hscan;
761 if (specs->hfmin == 0 || specs->hfmin > hscan)
762 specs->hfmin = hscan;
764 if (specs->vfmax == 0 || specs->vfmax < hz)
767 if (specs->vfmin == 0 || specs->vfmin > hz)
770 DPRINTK("Extrapolated\n");
771 fb_destroy_modedb(modes);
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);
779 static void get_monspecs(unsigned char *edid, struct fb_monspecs *specs)
781 unsigned char c, *block;
783 block = edid + EDID_STRUCT_DISPLAY;
785 fb_get_monitor_limits(edid, specs);
790 specs->input |= FB_DISP_DDI;
791 DPRINTK(" Digital Display Input");
793 DPRINTK(" Analog Display Input: Input Voltage - ");
794 switch ((block[0] & 0x60) >> 5) {
796 DPRINTK("0.700V/0.300V");
797 specs->input |= FB_DISP_ANA_700_300;
800 DPRINTK("0.714V/0.286V");
801 specs->input |= FB_DISP_ANA_714_286;
804 DPRINTK("1.000V/0.400V");
805 specs->input |= FB_DISP_ANA_1000_400;
808 DPRINTK("0.700V/0.000V");
809 specs->input |= FB_DISP_ANA_700_000;
813 DPRINTK("\n Sync: ");
816 DPRINTK(" Configurable signal level\n");
820 DPRINTK("Blank to Blank ");
821 specs->signal |= FB_SIGNAL_BLANK_BLANK;
824 DPRINTK("Separate ");
825 specs->signal |= FB_SIGNAL_SEPARATE;
828 DPRINTK("Composite ");
829 specs->signal |= FB_SIGNAL_COMPOSITE;
832 DPRINTK("Sync on Green ");
833 specs->signal |= FB_SIGNAL_SYNC_ON_GREEN;
836 DPRINTK("Serration on ");
837 specs->signal |= FB_SIGNAL_SERRATION_ON;
840 specs->max_x = block[1];
841 specs->max_y = block[2];
842 DPRINTK(" Max H-size in cm: ");
844 DPRINTK("%d\n", specs->max_x);
846 DPRINTK("variable\n");
847 DPRINTK(" Max V-size in cm: ");
849 DPRINTK("%d\n", specs->max_y);
851 DPRINTK("variable\n");
854 specs->gamma = c+100;
856 DPRINTK("%d.%d\n", specs->gamma/100, specs->gamma % 100);
858 get_dpms_capabilities(block[4], specs);
860 switch ((block[4] & 0x18) >> 3) {
862 DPRINTK(" Monochrome/Grayscale\n");
863 specs->input |= FB_DISP_MONO;
866 DPRINTK(" RGB Color Display\n");
867 specs->input |= FB_DISP_RGB;
870 DPRINTK(" Non-RGB Multicolor Display\n");
871 specs->input |= FB_DISP_MULTI;
874 DPRINTK(" Unknown\n");
875 specs->input |= FB_DISP_UNKNOWN;
879 get_chroma(block, specs);
884 DPRINTK(" Default color format is primary\n");
885 specs->misc |= FB_MISC_PRIM_COLOR;
888 DPRINTK(" First DETAILED Timing is preferred\n");
889 specs->misc |= FB_MISC_1ST_DETAIL;
892 printk(" Display is GTF capable\n");
897 int fb_parse_edid(unsigned char *edid, struct fb_var_screeninfo *var)
900 unsigned char *block;
902 if (edid == NULL || var == NULL)
905 if (!(edid_checksum(edid)))
908 if (!(edid_check_header(edid)))
911 block = edid + DETAILED_TIMING_DESCRIPTIONS_START;
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 -
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);
931 var->sync |= FB_SYNC_HOR_HIGH_ACT;
933 var->sync |= FB_SYNC_VERT_HIGH_ACT;
940 void fb_edid_to_monspecs(unsigned char *edid, struct fb_monspecs *specs)
942 unsigned char *block;
948 if (!(edid_checksum(edid)))
951 if (!(edid_check_header(edid)))
954 memset(specs, 0, sizeof(struct fb_monspecs));
956 specs->version = edid[EDID_STRUCT_VERSION];
957 specs->revision = edid[EDID_STRUCT_REVISION];
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);
965 parse_vendor_block(edid + ID_MANUFACTURER_NAME, specs);
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);
981 DPRINTK(" Display Characteristics:\n");
982 get_monspecs(edid, specs);
984 specs->modedb = fb_create_modedb(edid, &specs->modedb_len, specs);
987 * Workaround for buggy EDIDs that sets that the first
988 * detailed timing is preferred but has not detailed
991 for (i = 0; i < specs->modedb_len; i++) {
992 if (specs->modedb[i].flag & FB_MODE_IS_DETAILED) {
999 specs->misc &= ~FB_MISC_1ST_DETAIL;
1001 DPRINTK("========================================\n");
1005 * fb_edid_add_monspecs() - add monitor video modes from E-EDID data
1006 * @edid: 128 byte array with an E-EDID block
1007 * @spacs: monitor specs to be extended
1009 void fb_edid_add_monspecs(unsigned char *edid, struct fb_monspecs *specs)
1011 unsigned char *block;
1012 struct fb_videomode *m;
1014 u8 svd[64], edt[(128 - 4) / DETAILED_TIMING_DESCRIPTION_SIZE];
1015 u8 pos = 4, svd_n = 0;
1020 if (!edid_checksum(edid))
1023 if (edid[0] != 0x2 ||
1024 edid[2] < 4 || edid[2] > 128 - DETAILED_TIMING_DESCRIPTION_SIZE)
1027 DPRINTK(" Short Video Descriptors\n");
1029 while (pos < edid[2]) {
1030 u8 len = edid[pos] & 0x1f, type = (edid[pos] >> 5) & 7;
1031 pr_debug("Data block %u of %u bytes\n", type, len);
1033 for (i = pos; i < pos + len; i++) {
1034 u8 idx = edid[pos + i] & 0x7f;
1036 pr_debug("N%sative mode #%d\n",
1037 edid[pos + i] & 0x80 ? "" : "on-n", idx);
1039 } else if (type == 3 && len >= 3) {
1040 /* Check Vendor Specific Data Block. For HDMI,
1041 it is always 00-0C-03 for HDMI Licensing, LLC. */
1042 if (edid[pos + 1] == 3 && edid[pos + 2] == 0xc &&
1044 specs->misc |= FB_MISC_HDMI;
1049 block = edid + edid[2];
1051 DPRINTK(" Extended Detailed Timings\n");
1053 for (i = 0; i < (128 - edid[2]) / DETAILED_TIMING_DESCRIPTION_SIZE;
1054 i++, block += DETAILED_TIMING_DESCRIPTION_SIZE)
1056 edt[num++] = block - edid;
1058 /* Yikes, EDID data is totally useless */
1062 m = kzalloc((specs->modedb_len + num + svd_n) *
1063 sizeof(struct fb_videomode), GFP_KERNEL);
1068 memcpy(m, specs->modedb, specs->modedb_len * sizeof(struct fb_videomode));
1070 for (i = specs->modedb_len; i < specs->modedb_len + num; i++) {
1071 get_detailed_timing(edid + edt[i - specs->modedb_len], &m[i]);
1072 if (i == specs->modedb_len)
1073 m[i].flag |= FB_MODE_IS_FIRST;
1074 pr_debug("Adding %ux%u@%u\n", m[i].xres, m[i].yres, m[i].refresh);
1077 for (i = specs->modedb_len + num; i < specs->modedb_len + num + svd_n; i++) {
1078 int idx = svd[i - specs->modedb_len - num];
1079 if (!idx || idx > 63) {
1080 pr_warning("Reserved SVD code %d\n", idx);
1081 } else if (idx > ARRAY_SIZE(cea_modes) || !cea_modes[idx].xres) {
1082 pr_warning("Unimplemented SVD code %d\n", idx);
1084 memcpy(&m[i], cea_modes + idx, sizeof(m[i]));
1085 pr_debug("Adding SVD #%d: %ux%u@%u\n", idx,
1086 m[i].xres, m[i].yres, m[i].refresh);
1090 kfree(specs->modedb);
1092 specs->modedb_len = specs->modedb_len + num + svd_n;
1096 * VESA Generalized Timing Formula (GTF)
1100 #define V_FRONTPORCH 1
1102 #define H_SCALEFACTOR 20
1103 #define H_BLANKSCALE 128
1104 #define H_GRADIENT 600
1108 struct __fb_timings {
1121 * fb_get_vblank - get vertical blank time
1122 * @hfreq: horizontal freq
1125 * vblank = right_margin + vsync_len + left_margin
1127 * given: right_margin = 1 (V_FRONTPORCH)
1132 * left_margin = --------------- - vsync_len
1135 static u32 fb_get_vblank(u32 hfreq)
1139 vblank = (hfreq * FLYBACK)/1000;
1140 vblank = (vblank + 500)/1000;
1141 return (vblank + V_FRONTPORCH);
1145 * fb_get_hblank_by_freq - get horizontal blank time given hfreq
1146 * @hfreq: horizontal freq
1147 * @xres: horizontal resolution in pixels
1152 * hblank = ------------------
1155 * duty cycle = percent of htotal assigned to inactive display
1156 * duty cycle = C - (M/Hfreq)
1158 * where: C = ((offset - scale factor) * blank_scale)
1159 * -------------------------------------- + scale factor
1161 * M = blank_scale * gradient
1164 static u32 fb_get_hblank_by_hfreq(u32 hfreq, u32 xres)
1166 u32 c_val, m_val, duty_cycle, hblank;
1168 c_val = (((H_OFFSET - H_SCALEFACTOR) * H_BLANKSCALE)/256 +
1169 H_SCALEFACTOR) * 1000;
1170 m_val = (H_BLANKSCALE * H_GRADIENT)/256;
1171 m_val = (m_val * 1000000)/hfreq;
1172 duty_cycle = c_val - m_val;
1173 hblank = (xres * duty_cycle)/(100000 - duty_cycle);
1178 * fb_get_hblank_by_dclk - get horizontal blank time given pixelclock
1179 * @dclk: pixelclock in Hz
1180 * @xres: horizontal resolution in pixels
1185 * hblank = ------------------
1188 * duty cycle = percent of htotal assigned to inactive display
1189 * duty cycle = C - (M * h_period)
1191 * where: h_period = SQRT(100 - C + (0.4 * xres * M)/dclk) + C - 100
1192 * -----------------------------------------------
1198 static u32 fb_get_hblank_by_dclk(u32 dclk, u32 xres)
1200 u32 duty_cycle, h_period, hblank;
1203 h_period = 100 - C_VAL;
1204 h_period *= h_period;
1205 h_period += (M_VAL * xres * 2 * 1000)/(5 * dclk);
1208 h_period = int_sqrt(h_period);
1209 h_period -= (100 - C_VAL) * 100;
1211 h_period /= 2 * M_VAL;
1213 duty_cycle = C_VAL * 1000 - (M_VAL * h_period)/100;
1214 hblank = (xres * duty_cycle)/(100000 - duty_cycle) + 8;
1220 * fb_get_hfreq - estimate hsync
1221 * @vfreq: vertical refresh rate
1222 * @yres: vertical resolution
1226 * (yres + front_port) * vfreq * 1000000
1227 * hfreq = -------------------------------------
1228 * (1000000 - (vfreq * FLYBACK)
1232 static u32 fb_get_hfreq(u32 vfreq, u32 yres)
1236 divisor = (1000000 - (vfreq * FLYBACK))/1000;
1237 hfreq = (yres + V_FRONTPORCH) * vfreq * 1000;
1238 return (hfreq/divisor);
1241 static void fb_timings_vfreq(struct __fb_timings *timings)
1243 timings->hfreq = fb_get_hfreq(timings->vfreq, timings->vactive);
1244 timings->vblank = fb_get_vblank(timings->hfreq);
1245 timings->vtotal = timings->vactive + timings->vblank;
1246 timings->hblank = fb_get_hblank_by_hfreq(timings->hfreq,
1248 timings->htotal = timings->hactive + timings->hblank;
1249 timings->dclk = timings->htotal * timings->hfreq;
1252 static void fb_timings_hfreq(struct __fb_timings *timings)
1254 timings->vblank = fb_get_vblank(timings->hfreq);
1255 timings->vtotal = timings->vactive + timings->vblank;
1256 timings->vfreq = timings->hfreq/timings->vtotal;
1257 timings->hblank = fb_get_hblank_by_hfreq(timings->hfreq,
1259 timings->htotal = timings->hactive + timings->hblank;
1260 timings->dclk = timings->htotal * timings->hfreq;
1263 static void fb_timings_dclk(struct __fb_timings *timings)
1265 timings->hblank = fb_get_hblank_by_dclk(timings->dclk,
1267 timings->htotal = timings->hactive + timings->hblank;
1268 timings->hfreq = timings->dclk/timings->htotal;
1269 timings->vblank = fb_get_vblank(timings->hfreq);
1270 timings->vtotal = timings->vactive + timings->vblank;
1271 timings->vfreq = timings->hfreq/timings->vtotal;
1275 * fb_get_mode - calculates video mode using VESA GTF
1276 * @flags: if: 0 - maximize vertical refresh rate
1277 * 1 - vrefresh-driven calculation;
1278 * 2 - hscan-driven calculation;
1279 * 3 - pixelclock-driven calculation;
1280 * @val: depending on @flags, ignored, vrefresh, hsync or pixelclock
1281 * @var: pointer to fb_var_screeninfo
1282 * @info: pointer to fb_info
1285 * Calculates video mode based on monitor specs using VESA GTF.
1286 * The GTF is best for VESA GTF compliant monitors but is
1287 * specifically formulated to work for older monitors as well.
1289 * If @flag==0, the function will attempt to maximize the
1290 * refresh rate. Otherwise, it will calculate timings based on
1291 * the flag and accompanying value.
1293 * If FB_IGNOREMON bit is set in @flags, monitor specs will be
1294 * ignored and @var will be filled with the calculated timings.
1296 * All calculations are based on the VESA GTF Spreadsheet
1297 * available at VESA's public ftp (http://www.vesa.org).
1300 * The timings generated by the GTF will be different from VESA
1301 * DMT. It might be a good idea to keep a table of standard
1302 * VESA modes as well. The GTF may also not work for some displays,
1303 * such as, and especially, analog TV.
1306 * A valid info->monspecs, otherwise 'safe numbers' will be used.
1308 int fb_get_mode(int flags, u32 val, struct fb_var_screeninfo *var, struct fb_info *info)
1310 struct __fb_timings *timings;
1311 u32 interlace = 1, dscan = 1;
1312 u32 hfmin, hfmax, vfmin, vfmax, dclkmin, dclkmax, err = 0;
1315 timings = kzalloc(sizeof(struct __fb_timings), GFP_KERNEL);
1321 * If monspecs are invalid, use values that are enough
1324 if (!info || !info->monspecs.hfmax || !info->monspecs.vfmax ||
1325 !info->monspecs.dclkmax ||
1326 info->monspecs.hfmax < info->monspecs.hfmin ||
1327 info->monspecs.vfmax < info->monspecs.vfmin ||
1328 info->monspecs.dclkmax < info->monspecs.dclkmin) {
1329 hfmin = 29000; hfmax = 30000;
1330 vfmin = 60; vfmax = 60;
1331 dclkmin = 0; dclkmax = 25000000;
1333 hfmin = info->monspecs.hfmin;
1334 hfmax = info->monspecs.hfmax;
1335 vfmin = info->monspecs.vfmin;
1336 vfmax = info->monspecs.vfmax;
1337 dclkmin = info->monspecs.dclkmin;
1338 dclkmax = info->monspecs.dclkmax;
1341 timings->hactive = var->xres;
1342 timings->vactive = var->yres;
1343 if (var->vmode & FB_VMODE_INTERLACED) {
1344 timings->vactive /= 2;
1347 if (var->vmode & FB_VMODE_DOUBLE) {
1348 timings->vactive *= 2;
1352 switch (flags & ~FB_IGNOREMON) {
1353 case FB_MAXTIMINGS: /* maximize refresh rate */
1354 timings->hfreq = hfmax;
1355 fb_timings_hfreq(timings);
1356 if (timings->vfreq > vfmax) {
1357 timings->vfreq = vfmax;
1358 fb_timings_vfreq(timings);
1360 if (timings->dclk > dclkmax) {
1361 timings->dclk = dclkmax;
1362 fb_timings_dclk(timings);
1365 case FB_VSYNCTIMINGS: /* vrefresh driven */
1366 timings->vfreq = val;
1367 fb_timings_vfreq(timings);
1369 case FB_HSYNCTIMINGS: /* hsync driven */
1370 timings->hfreq = val;
1371 fb_timings_hfreq(timings);
1373 case FB_DCLKTIMINGS: /* pixelclock driven */
1374 timings->dclk = PICOS2KHZ(val) * 1000;
1375 fb_timings_dclk(timings);
1382 if (err || (!(flags & FB_IGNOREMON) &&
1383 (timings->vfreq < vfmin || timings->vfreq > vfmax ||
1384 timings->hfreq < hfmin || timings->hfreq > hfmax ||
1385 timings->dclk < dclkmin || timings->dclk > dclkmax))) {
1388 var->pixclock = KHZ2PICOS(timings->dclk/1000);
1389 var->hsync_len = (timings->htotal * 8)/100;
1390 var->right_margin = (timings->hblank/2) - var->hsync_len;
1391 var->left_margin = timings->hblank - var->right_margin -
1393 var->vsync_len = (3 * interlace)/dscan;
1394 var->lower_margin = (1 * interlace)/dscan;
1395 var->upper_margin = (timings->vblank * interlace)/dscan -
1396 (var->vsync_len + var->lower_margin);
1403 #ifdef CONFIG_VIDEOMODE_HELPERS
1404 int fb_videomode_from_videomode(const struct videomode *vm,
1405 struct fb_videomode *fbmode)
1407 unsigned int htotal, vtotal;
1409 fbmode->xres = vm->hactive;
1410 fbmode->left_margin = vm->hback_porch;
1411 fbmode->right_margin = vm->hfront_porch;
1412 fbmode->hsync_len = vm->hsync_len;
1414 fbmode->yres = vm->vactive;
1415 fbmode->upper_margin = vm->vback_porch;
1416 fbmode->lower_margin = vm->vfront_porch;
1417 fbmode->vsync_len = vm->vsync_len;
1419 /* prevent division by zero in KHZ2PICOS macro */
1420 fbmode->pixclock = vm->pixelclock ?
1421 KHZ2PICOS(vm->pixelclock / 1000) : 0;
1425 if (vm->flags & DISPLAY_FLAGS_HSYNC_HIGH)
1426 fbmode->sync |= FB_SYNC_HOR_HIGH_ACT;
1427 if (vm->flags & DISPLAY_FLAGS_VSYNC_HIGH)
1428 fbmode->sync |= FB_SYNC_VERT_HIGH_ACT;
1429 if (vm->flags & DISPLAY_FLAGS_INTERLACED)
1430 fbmode->vmode |= FB_VMODE_INTERLACED;
1431 if (vm->flags & DISPLAY_FLAGS_DOUBLESCAN)
1432 fbmode->vmode |= FB_VMODE_DOUBLE;
1435 htotal = vm->hactive + vm->hfront_porch + vm->hback_porch +
1437 vtotal = vm->vactive + vm->vfront_porch + vm->vback_porch +
1439 /* prevent division by zero */
1440 if (htotal && vtotal) {
1441 fbmode->refresh = vm->pixelclock / (htotal * vtotal);
1442 /* a mode must have htotal and vtotal != 0 or it is invalid */
1444 fbmode->refresh = 0;
1450 EXPORT_SYMBOL_GPL(fb_videomode_from_videomode);
1453 static inline void dump_fb_videomode(const struct fb_videomode *m)
1455 pr_debug("fb_videomode = %ux%u@%uHz (%ukHz) %u %u %u %u %u %u %u %u %u\n",
1456 m->xres, m->yres, m->refresh, m->pixclock, m->left_margin,
1457 m->right_margin, m->upper_margin, m->lower_margin,
1458 m->hsync_len, m->vsync_len, m->sync, m->vmode, m->flag);
1462 * of_get_fb_videomode - get a fb_videomode from devicetree
1463 * @np: device_node with the timing specification
1464 * @fb: will be set to the return value
1465 * @index: index into the list of display timings in devicetree
1468 * This function is expensive and should only be used, if only one mode is to be
1469 * read from DT. To get multiple modes start with of_get_display_timings ond
1470 * work with that instead.
1472 int of_get_fb_videomode(struct device_node *np, struct fb_videomode *fb,
1475 struct videomode vm;
1478 ret = of_get_videomode(np, &vm, index);
1482 fb_videomode_from_videomode(&vm, fb);
1484 pr_debug("%s: got %dx%d display mode from %s\n",
1485 of_node_full_name(np), vm.hactive, vm.vactive, np->name);
1486 dump_fb_videomode(fb);
1490 EXPORT_SYMBOL_GPL(of_get_fb_videomode);
1491 #endif /* CONFIG_OF */
1492 #endif /* CONFIG_VIDEOMODE_HELPERS */
1495 int fb_parse_edid(unsigned char *edid, struct fb_var_screeninfo *var)
1499 void fb_edid_to_monspecs(unsigned char *edid, struct fb_monspecs *specs)
1503 void fb_edid_add_monspecs(unsigned char *edid, struct fb_monspecs *specs)
1506 void fb_destroy_modedb(struct fb_videomode *modedb)
1509 int fb_get_mode(int flags, u32 val, struct fb_var_screeninfo *var,
1510 struct fb_info *info)
1514 #endif /* CONFIG_FB_MODE_HELPERS */
1517 * fb_validate_mode - validates var against monitor capabilities
1518 * @var: pointer to fb_var_screeninfo
1519 * @info: pointer to fb_info
1522 * Validates video mode against monitor capabilities specified in
1526 * A valid info->monspecs.
1528 int fb_validate_mode(const struct fb_var_screeninfo *var, struct fb_info *info)
1530 u32 hfreq, vfreq, htotal, vtotal, pixclock;
1531 u32 hfmin, hfmax, vfmin, vfmax, dclkmin, dclkmax;
1534 * If monspecs are invalid, use values that are enough
1537 if (!info->monspecs.hfmax || !info->monspecs.vfmax ||
1538 !info->monspecs.dclkmax ||
1539 info->monspecs.hfmax < info->monspecs.hfmin ||
1540 info->monspecs.vfmax < info->monspecs.vfmin ||
1541 info->monspecs.dclkmax < info->monspecs.dclkmin) {
1542 hfmin = 29000; hfmax = 30000;
1543 vfmin = 60; vfmax = 60;
1544 dclkmin = 0; dclkmax = 25000000;
1546 hfmin = info->monspecs.hfmin;
1547 hfmax = info->monspecs.hfmax;
1548 vfmin = info->monspecs.vfmin;
1549 vfmax = info->monspecs.vfmax;
1550 dclkmin = info->monspecs.dclkmin;
1551 dclkmax = info->monspecs.dclkmax;
1556 pixclock = PICOS2KHZ(var->pixclock) * 1000;
1558 htotal = var->xres + var->right_margin + var->hsync_len +
1560 vtotal = var->yres + var->lower_margin + var->vsync_len +
1563 if (var->vmode & FB_VMODE_INTERLACED)
1565 if (var->vmode & FB_VMODE_DOUBLE)
1568 hfreq = pixclock/htotal;
1569 hfreq = (hfreq + 500) / 1000 * 1000;
1571 vfreq = hfreq/vtotal;
1573 return (vfreq < vfmin || vfreq > vfmax ||
1574 hfreq < hfmin || hfreq > hfmax ||
1575 pixclock < dclkmin || pixclock > dclkmax) ?
1579 #if defined(CONFIG_FIRMWARE_EDID) && defined(CONFIG_X86)
1582 * We need to ensure that the EDID block is only returned for
1583 * the primary graphics adapter.
1586 const unsigned char *fb_firmware_edid(struct device *device)
1588 struct pci_dev *dev = NULL;
1589 struct resource *res = NULL;
1590 unsigned char *edid = NULL;
1593 dev = to_pci_dev(device);
1596 res = &dev->resource[PCI_ROM_RESOURCE];
1598 if (res && res->flags & IORESOURCE_ROM_SHADOW)
1599 edid = edid_info.dummy;
1604 const unsigned char *fb_firmware_edid(struct device *device)
1609 EXPORT_SYMBOL(fb_firmware_edid);
1611 EXPORT_SYMBOL(fb_parse_edid);
1612 EXPORT_SYMBOL(fb_edid_to_monspecs);
1613 EXPORT_SYMBOL(fb_edid_add_monspecs);
1614 EXPORT_SYMBOL(fb_get_mode);
1615 EXPORT_SYMBOL(fb_validate_mode);
1616 EXPORT_SYMBOL(fb_destroy_modedb);