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>
36 #include <asm/pci-bridge.h>
44 #undef DEBUG /* define this for verbose EDID parsing output */
47 #define DPRINTK(fmt, args...) printk(fmt,## args)
49 #define DPRINTK(fmt, args...)
52 #define FBMON_FIX_HEADER 1
53 #define FBMON_FIX_INPUT 2
54 #define FBMON_FIX_TIMINGS 3
56 #ifdef CONFIG_FB_MODE_HELPERS
63 static const struct broken_edid brokendb[] = {
66 .manufacturer = "DEC",
68 .fix = FBMON_FIX_HEADER,
70 /* ViewSonic PF775a */
72 .manufacturer = "VSC",
74 .fix = FBMON_FIX_INPUT,
78 .manufacturer = "SHP",
80 .fix = FBMON_FIX_TIMINGS,
84 static const unsigned char edid_v1_header[] = { 0x00, 0xff, 0xff, 0xff,
85 0xff, 0xff, 0xff, 0x00
88 static void copy_string(unsigned char *c, unsigned char *s)
92 for (i = 0; (i < 13 && *c != 0x0A); i++)
95 while (i-- && (*--s == 0x20)) *s = 0;
98 static int edid_is_serial_block(unsigned char *block)
100 if ((block[0] == 0x00) && (block[1] == 0x00) &&
101 (block[2] == 0x00) && (block[3] == 0xff) &&
108 static int edid_is_ascii_block(unsigned char *block)
110 if ((block[0] == 0x00) && (block[1] == 0x00) &&
111 (block[2] == 0x00) && (block[3] == 0xfe) &&
118 static int edid_is_limits_block(unsigned char *block)
120 if ((block[0] == 0x00) && (block[1] == 0x00) &&
121 (block[2] == 0x00) && (block[3] == 0xfd) &&
128 static int edid_is_monitor_block(unsigned char *block)
130 if ((block[0] == 0x00) && (block[1] == 0x00) &&
131 (block[2] == 0x00) && (block[3] == 0xfc) &&
138 static int edid_is_timing_block(unsigned char *block)
140 if ((block[0] != 0x00) || (block[1] != 0x00) ||
141 (block[2] != 0x00) || (block[4] != 0x00))
147 static int check_edid(unsigned char *edid)
149 unsigned char *block = edid + ID_MANUFACTURER_NAME, manufacturer[4];
152 int i, fix = 0, ret = 0;
154 manufacturer[0] = ((block[0] & 0x7c) >> 2) + '@';
155 manufacturer[1] = ((block[0] & 0x03) << 3) +
156 ((block[1] & 0xe0) >> 5) + '@';
157 manufacturer[2] = (block[1] & 0x1f) + '@';
159 model = block[2] + (block[3] << 8);
161 for (i = 0; i < ARRAY_SIZE(brokendb); i++) {
162 if (!strncmp(manufacturer, brokendb[i].manufacturer, 4) &&
163 brokendb[i].model == model) {
164 fix = brokendb[i].fix;
170 case FBMON_FIX_HEADER:
171 for (i = 0; i < 8; i++) {
172 if (edid[i] != edid_v1_header[i]) {
178 case FBMON_FIX_INPUT:
179 b = edid + EDID_STRUCT_DISPLAY;
180 /* Only if display is GTF capable will
181 the input type be reset to analog */
182 if (b[4] & 0x01 && b[0] & 0x80)
185 case FBMON_FIX_TIMINGS:
186 b = edid + DETAILED_TIMING_DESCRIPTIONS_START;
189 for (i = 0; i < 4; i++) {
190 if (edid_is_limits_block(b)) {
195 b += DETAILED_TIMING_DESCRIPTION_SIZE;
202 printk("fbmon: The EDID Block of "
203 "Manufacturer: %s Model: 0x%x is known to "
204 "be broken,\n", manufacturer, model);
209 static void fix_edid(unsigned char *edid, int fix)
212 unsigned char *b, csum = 0;
215 case FBMON_FIX_HEADER:
216 printk("fbmon: trying a header reconstruct\n");
217 memcpy(edid, edid_v1_header, 8);
219 case FBMON_FIX_INPUT:
220 printk("fbmon: trying to fix input type\n");
221 b = edid + EDID_STRUCT_DISPLAY;
225 case FBMON_FIX_TIMINGS:
226 printk("fbmon: trying to fix monitor timings\n");
227 b = edid + DETAILED_TIMING_DESCRIPTIONS_START;
228 for (i = 0; i < 4; i++) {
229 if (!(edid_is_serial_block(b) ||
230 edid_is_ascii_block(b) ||
231 edid_is_monitor_block(b) ||
232 edid_is_timing_block(b))) {
238 b[5] = 60; /* vfmin */
239 b[6] = 60; /* vfmax */
240 b[7] = 30; /* hfmin */
241 b[8] = 75; /* hfmax */
242 b[9] = 17; /* pixclock - 170 MHz*/
247 b += DETAILED_TIMING_DESCRIPTION_SIZE;
250 for (i = 0; i < EDID_LENGTH - 1; i++)
253 edid[127] = 256 - csum;
258 static int edid_checksum(unsigned char *edid)
260 unsigned char csum = 0, all_null = 0;
261 int i, err = 0, fix = check_edid(edid);
266 for (i = 0; i < EDID_LENGTH; i++) {
271 if (csum == 0x00 && all_null) {
272 /* checksum passed, everything's good */
279 static int edid_check_header(unsigned char *edid)
281 int i, err = 1, fix = check_edid(edid);
286 for (i = 0; i < 8; i++) {
287 if (edid[i] != edid_v1_header[i])
294 static void parse_vendor_block(unsigned char *block, struct fb_monspecs *specs)
296 specs->manufacturer[0] = ((block[0] & 0x7c) >> 2) + '@';
297 specs->manufacturer[1] = ((block[0] & 0x03) << 3) +
298 ((block[1] & 0xe0) >> 5) + '@';
299 specs->manufacturer[2] = (block[1] & 0x1f) + '@';
300 specs->manufacturer[3] = 0;
301 specs->model = block[2] + (block[3] << 8);
302 specs->serial = block[4] + (block[5] << 8) +
303 (block[6] << 16) + (block[7] << 24);
304 specs->year = block[9] + 1990;
305 specs->week = block[8];
306 DPRINTK(" Manufacturer: %s\n", specs->manufacturer);
307 DPRINTK(" Model: %x\n", specs->model);
308 DPRINTK(" Serial#: %u\n", specs->serial);
309 DPRINTK(" Year: %u Week %u\n", specs->year, specs->week);
312 static void get_dpms_capabilities(unsigned char flags,
313 struct fb_monspecs *specs)
316 if (flags & DPMS_ACTIVE_OFF)
317 specs->dpms |= FB_DPMS_ACTIVE_OFF;
318 if (flags & DPMS_SUSPEND)
319 specs->dpms |= FB_DPMS_SUSPEND;
320 if (flags & DPMS_STANDBY)
321 specs->dpms |= FB_DPMS_STANDBY;
322 DPRINTK(" DPMS: Active %s, Suspend %s, Standby %s\n",
323 (flags & DPMS_ACTIVE_OFF) ? "yes" : "no",
324 (flags & DPMS_SUSPEND) ? "yes" : "no",
325 (flags & DPMS_STANDBY) ? "yes" : "no");
328 static void get_chroma(unsigned char *block, struct fb_monspecs *specs)
332 DPRINTK(" Chroma\n");
333 /* Chromaticity data */
334 tmp = ((block[5] & (3 << 6)) >> 6) | (block[0x7] << 2);
337 specs->chroma.redx = tmp/1024;
338 DPRINTK(" RedX: 0.%03d ", specs->chroma.redx);
340 tmp = ((block[5] & (3 << 4)) >> 4) | (block[0x8] << 2);
343 specs->chroma.redy = tmp/1024;
344 DPRINTK("RedY: 0.%03d\n", specs->chroma.redy);
346 tmp = ((block[5] & (3 << 2)) >> 2) | (block[0x9] << 2);
349 specs->chroma.greenx = tmp/1024;
350 DPRINTK(" GreenX: 0.%03d ", specs->chroma.greenx);
352 tmp = (block[5] & 3) | (block[0xa] << 2);
355 specs->chroma.greeny = tmp/1024;
356 DPRINTK("GreenY: 0.%03d\n", specs->chroma.greeny);
358 tmp = ((block[6] & (3 << 6)) >> 6) | (block[0xb] << 2);
361 specs->chroma.bluex = tmp/1024;
362 DPRINTK(" BlueX: 0.%03d ", specs->chroma.bluex);
364 tmp = ((block[6] & (3 << 4)) >> 4) | (block[0xc] << 2);
367 specs->chroma.bluey = tmp/1024;
368 DPRINTK("BlueY: 0.%03d\n", specs->chroma.bluey);
370 tmp = ((block[6] & (3 << 2)) >> 2) | (block[0xd] << 2);
373 specs->chroma.whitex = tmp/1024;
374 DPRINTK(" WhiteX: 0.%03d ", specs->chroma.whitex);
376 tmp = (block[6] & 3) | (block[0xe] << 2);
379 specs->chroma.whitey = tmp/1024;
380 DPRINTK("WhiteY: 0.%03d\n", specs->chroma.whitey);
383 static void calc_mode_timings(int xres, int yres, int refresh,
384 struct fb_videomode *mode)
386 struct fb_var_screeninfo *var;
388 var = kzalloc(sizeof(struct fb_var_screeninfo), GFP_KERNEL);
393 fb_get_mode(FB_VSYNCTIMINGS | FB_IGNOREMON,
397 mode->pixclock = var->pixclock;
398 mode->refresh = refresh;
399 mode->left_margin = var->left_margin;
400 mode->right_margin = var->right_margin;
401 mode->upper_margin = var->upper_margin;
402 mode->lower_margin = var->lower_margin;
403 mode->hsync_len = var->hsync_len;
404 mode->vsync_len = var->vsync_len;
411 static int get_est_timing(unsigned char *block, struct fb_videomode *mode)
418 calc_mode_timings(720, 400, 70, &mode[num]);
419 mode[num++].flag = FB_MODE_IS_CALCULATED;
420 DPRINTK(" 720x400@70Hz\n");
423 calc_mode_timings(720, 400, 88, &mode[num]);
424 mode[num++].flag = FB_MODE_IS_CALCULATED;
425 DPRINTK(" 720x400@88Hz\n");
428 mode[num++] = vesa_modes[3];
429 DPRINTK(" 640x480@60Hz\n");
432 calc_mode_timings(640, 480, 67, &mode[num]);
433 mode[num++].flag = FB_MODE_IS_CALCULATED;
434 DPRINTK(" 640x480@67Hz\n");
437 mode[num++] = vesa_modes[4];
438 DPRINTK(" 640x480@72Hz\n");
441 mode[num++] = vesa_modes[5];
442 DPRINTK(" 640x480@75Hz\n");
445 mode[num++] = vesa_modes[7];
446 DPRINTK(" 800x600@56Hz\n");
449 mode[num++] = vesa_modes[8];
450 DPRINTK(" 800x600@60Hz\n");
455 mode[num++] = vesa_modes[9];
456 DPRINTK(" 800x600@72Hz\n");
459 mode[num++] = vesa_modes[10];
460 DPRINTK(" 800x600@75Hz\n");
463 calc_mode_timings(832, 624, 75, &mode[num]);
464 mode[num++].flag = FB_MODE_IS_CALCULATED;
465 DPRINTK(" 832x624@75Hz\n");
468 mode[num++] = vesa_modes[12];
469 DPRINTK(" 1024x768@87Hz Interlaced\n");
472 mode[num++] = vesa_modes[13];
473 DPRINTK(" 1024x768@60Hz\n");
476 mode[num++] = vesa_modes[14];
477 DPRINTK(" 1024x768@70Hz\n");
480 mode[num++] = vesa_modes[15];
481 DPRINTK(" 1024x768@75Hz\n");
484 mode[num++] = vesa_modes[21];
485 DPRINTK(" 1280x1024@75Hz\n");
489 mode[num++] = vesa_modes[17];
490 DPRINTK(" 1152x870@75Hz\n");
492 DPRINTK(" Manufacturer's mask: %x\n",c&0x7F);
496 static int get_std_timing(unsigned char *block, struct fb_videomode *mode)
498 int xres, yres = 0, refresh, ratio, i;
500 xres = (block[0] + 31) * 8;
504 ratio = (block[1] & 0xc0) >> 6;
516 yres = (xres * 9)/16;
519 refresh = (block[1] & 0x3f) + 60;
521 DPRINTK(" %dx%d@%dHz\n", xres, yres, refresh);
522 for (i = 0; i < VESA_MODEDB_SIZE; i++) {
523 if (vesa_modes[i].xres == xres &&
524 vesa_modes[i].yres == yres &&
525 vesa_modes[i].refresh == refresh) {
526 *mode = vesa_modes[i];
527 mode->flag |= FB_MODE_IS_STANDARD;
531 calc_mode_timings(xres, yres, refresh, mode);
535 static int get_dst_timing(unsigned char *block,
536 struct fb_videomode *mode)
540 for (j = 0; j < 6; j++, block += STD_TIMING_DESCRIPTION_SIZE)
541 num += get_std_timing(block, &mode[num]);
546 static void get_detailed_timing(unsigned char *block,
547 struct fb_videomode *mode)
552 mode->xres = H_ACTIVE;
553 mode->yres = V_ACTIVE;
554 mode->pixclock = PIXEL_CLOCK;
555 mode->pixclock /= 1000;
556 mode->pixclock = KHZ2PICOS(mode->pixclock);
557 mode->right_margin = H_SYNC_OFFSET;
558 mode->left_margin = (H_ACTIVE + H_BLANKING) -
559 (H_ACTIVE + H_SYNC_OFFSET + H_SYNC_WIDTH);
560 mode->upper_margin = V_BLANKING - V_SYNC_OFFSET -
562 mode->lower_margin = V_SYNC_OFFSET;
563 mode->hsync_len = H_SYNC_WIDTH;
564 mode->vsync_len = V_SYNC_WIDTH;
566 mode->sync |= FB_SYNC_HOR_HIGH_ACT;
568 mode->sync |= FB_SYNC_VERT_HIGH_ACT;
569 mode->refresh = PIXEL_CLOCK/((H_ACTIVE + H_BLANKING) *
570 (V_ACTIVE + V_BLANKING));
573 mode->upper_margin *= 2;
574 mode->lower_margin *= 2;
575 mode->vsync_len *= 2;
576 mode->vmode |= FB_VMODE_INTERLACED;
578 mode->flag = FB_MODE_IS_DETAILED;
580 /* get aspect ratio */
581 if (h_size * 18 > v_size * 31 && h_size * 18 < v_size * 33)
582 mode->flag |= FB_FLAG_RATIO_16_9;
583 if (h_size * 18 > v_size * 23 && h_size * 18 < v_size * 25)
584 mode->flag |= FB_FLAG_RATIO_4_3;
586 DPRINTK(" %d MHz ", PIXEL_CLOCK/1000000);
587 DPRINTK("%d %d %d %d ", H_ACTIVE, H_ACTIVE + H_SYNC_OFFSET,
588 H_ACTIVE + H_SYNC_OFFSET + H_SYNC_WIDTH, H_ACTIVE + H_BLANKING);
589 DPRINTK("%d %d %d %d ", V_ACTIVE, V_ACTIVE + V_SYNC_OFFSET,
590 V_ACTIVE + V_SYNC_OFFSET + V_SYNC_WIDTH, V_ACTIVE + V_BLANKING);
591 DPRINTK("%dmm %dmm ", H_SIZE, V_SIZE);
592 DPRINTK("%sHSync %sVSync\n\n", (HSYNC_POSITIVE) ? "+" : "-",
593 (VSYNC_POSITIVE) ? "+" : "-");
597 * fb_create_modedb - create video mode database
599 * @dbsize: database size
601 * RETURNS: struct fb_videomode, @dbsize contains length of database
604 * This function builds a mode database using the contents of the EDID
607 static struct fb_videomode *fb_create_modedb(unsigned char *edid, int *dbsize)
609 struct fb_videomode *mode, *m;
610 unsigned char *block;
611 int num = 0, i, first = 1;
613 mode = kzalloc(50 * sizeof(struct fb_videomode), GFP_KERNEL);
617 if (edid == NULL || !edid_checksum(edid) ||
618 !edid_check_header(edid)) {
625 DPRINTK(" Detailed Timings\n");
626 block = edid + DETAILED_TIMING_DESCRIPTIONS_START;
627 for (i = 0; i < 4; i++, block+= DETAILED_TIMING_DESCRIPTION_SIZE) {
628 if (!(block[0] == 0x00 && block[1] == 0x00)) {
629 get_detailed_timing(block, &mode[num]);
631 mode[num].flag |= FB_MODE_IS_FIRST;
638 DPRINTK(" Supported VESA Modes\n");
639 block = edid + ESTABLISHED_TIMING_1;
640 num += get_est_timing(block, &mode[num]);
642 DPRINTK(" Standard Timings\n");
643 block = edid + STD_TIMING_DESCRIPTIONS_START;
644 for (i = 0; i < STD_TIMING; i++, block += STD_TIMING_DESCRIPTION_SIZE)
645 num += get_std_timing(block, &mode[num]);
647 block = edid + DETAILED_TIMING_DESCRIPTIONS_START;
648 for (i = 0; i < 4; i++, block+= DETAILED_TIMING_DESCRIPTION_SIZE) {
649 if (block[0] == 0x00 && block[1] == 0x00 && block[3] == 0xfa)
650 num += get_dst_timing(block + 5, &mode[num]);
653 /* Yikes, EDID data is totally useless */
660 m = kmalloc(num * sizeof(struct fb_videomode), GFP_KERNEL);
663 memmove(m, mode, num * sizeof(struct fb_videomode));
669 * fb_destroy_modedb - destroys mode database
670 * @modedb: mode database to destroy
673 * Destroy mode database created by fb_create_modedb
675 void fb_destroy_modedb(struct fb_videomode *modedb)
680 static int fb_get_monitor_limits(unsigned char *edid, struct fb_monspecs *specs)
683 unsigned char *block;
685 block = edid + DETAILED_TIMING_DESCRIPTIONS_START;
687 DPRINTK(" Monitor Operating Limits: ");
689 for (i = 0; i < 4; i++, block += DETAILED_TIMING_DESCRIPTION_SIZE) {
690 if (edid_is_limits_block(block)) {
691 specs->hfmin = H_MIN_RATE * 1000;
692 specs->hfmax = H_MAX_RATE * 1000;
693 specs->vfmin = V_MIN_RATE;
694 specs->vfmax = V_MAX_RATE;
695 specs->dclkmax = MAX_PIXEL_CLOCK * 1000000;
696 specs->gtf = (GTF_SUPPORT) ? 1 : 0;
698 DPRINTK("From EDID\n");
703 /* estimate monitor limits based on modes supported */
705 struct fb_videomode *modes, *mode;
706 int num_modes, hz, hscan, pixclock;
709 modes = fb_create_modedb(edid, &num_modes);
711 DPRINTK("None Available\n");
716 for (i = 0; i < num_modes; i++) {
718 pixclock = PICOS2KHZ(modes[i].pixclock) * 1000;
719 htotal = mode->xres + mode->right_margin + mode->hsync_len
721 vtotal = mode->yres + mode->lower_margin + mode->vsync_len
722 + mode->upper_margin;
724 if (mode->vmode & FB_VMODE_INTERLACED)
727 if (mode->vmode & FB_VMODE_DOUBLE)
730 hscan = (pixclock + htotal / 2) / htotal;
731 hscan = (hscan + 500) / 1000 * 1000;
732 hz = (hscan + vtotal / 2) / vtotal;
734 if (specs->dclkmax == 0 || specs->dclkmax < pixclock)
735 specs->dclkmax = pixclock;
737 if (specs->dclkmin == 0 || specs->dclkmin > pixclock)
738 specs->dclkmin = pixclock;
740 if (specs->hfmax == 0 || specs->hfmax < hscan)
741 specs->hfmax = hscan;
743 if (specs->hfmin == 0 || specs->hfmin > hscan)
744 specs->hfmin = hscan;
746 if (specs->vfmax == 0 || specs->vfmax < hz)
749 if (specs->vfmin == 0 || specs->vfmin > hz)
752 DPRINTK("Extrapolated\n");
753 fb_destroy_modedb(modes);
755 DPRINTK(" H: %d-%dKHz V: %d-%dHz DCLK: %dMHz\n",
756 specs->hfmin/1000, specs->hfmax/1000, specs->vfmin,
757 specs->vfmax, specs->dclkmax/1000000);
761 static void get_monspecs(unsigned char *edid, struct fb_monspecs *specs)
763 unsigned char c, *block;
765 block = edid + EDID_STRUCT_DISPLAY;
767 fb_get_monitor_limits(edid, specs);
772 specs->input |= FB_DISP_DDI;
773 DPRINTK(" Digital Display Input");
775 DPRINTK(" Analog Display Input: Input Voltage - ");
776 switch ((block[0] & 0x60) >> 5) {
778 DPRINTK("0.700V/0.300V");
779 specs->input |= FB_DISP_ANA_700_300;
782 DPRINTK("0.714V/0.286V");
783 specs->input |= FB_DISP_ANA_714_286;
786 DPRINTK("1.000V/0.400V");
787 specs->input |= FB_DISP_ANA_1000_400;
790 DPRINTK("0.700V/0.000V");
791 specs->input |= FB_DISP_ANA_700_000;
795 DPRINTK("\n Sync: ");
798 DPRINTK(" Configurable signal level\n");
802 DPRINTK("Blank to Blank ");
803 specs->signal |= FB_SIGNAL_BLANK_BLANK;
806 DPRINTK("Separate ");
807 specs->signal |= FB_SIGNAL_SEPARATE;
810 DPRINTK("Composite ");
811 specs->signal |= FB_SIGNAL_COMPOSITE;
814 DPRINTK("Sync on Green ");
815 specs->signal |= FB_SIGNAL_SYNC_ON_GREEN;
818 DPRINTK("Serration on ");
819 specs->signal |= FB_SIGNAL_SERRATION_ON;
822 specs->max_x = block[1];
823 specs->max_y = block[2];
824 DPRINTK(" Max H-size in cm: ");
826 DPRINTK("%d\n", specs->max_x);
828 DPRINTK("variable\n");
829 DPRINTK(" Max V-size in cm: ");
831 DPRINTK("%d\n", specs->max_y);
833 DPRINTK("variable\n");
836 specs->gamma = c+100;
838 DPRINTK("%d.%d\n", specs->gamma/100, specs->gamma % 100);
840 get_dpms_capabilities(block[4], specs);
842 switch ((block[4] & 0x18) >> 3) {
844 DPRINTK(" Monochrome/Grayscale\n");
845 specs->input |= FB_DISP_MONO;
848 DPRINTK(" RGB Color Display\n");
849 specs->input |= FB_DISP_RGB;
852 DPRINTK(" Non-RGB Multicolor Display\n");
853 specs->input |= FB_DISP_MULTI;
856 DPRINTK(" Unknown\n");
857 specs->input |= FB_DISP_UNKNOWN;
861 get_chroma(block, specs);
866 DPRINTK(" Default color format is primary\n");
867 specs->misc |= FB_MISC_PRIM_COLOR;
870 DPRINTK(" First DETAILED Timing is preferred\n");
871 specs->misc |= FB_MISC_1ST_DETAIL;
874 printk(" Display is GTF capable\n");
879 int fb_parse_edid(unsigned char *edid, struct fb_var_screeninfo *var)
882 unsigned char *block;
884 if (edid == NULL || var == NULL)
887 if (!(edid_checksum(edid)))
890 if (!(edid_check_header(edid)))
893 block = edid + DETAILED_TIMING_DESCRIPTIONS_START;
895 for (i = 0; i < 4; i++, block += DETAILED_TIMING_DESCRIPTION_SIZE) {
896 if (edid_is_timing_block(block)) {
897 var->xres = var->xres_virtual = H_ACTIVE;
898 var->yres = var->yres_virtual = V_ACTIVE;
899 var->height = var->width = 0;
900 var->right_margin = H_SYNC_OFFSET;
901 var->left_margin = (H_ACTIVE + H_BLANKING) -
902 (H_ACTIVE + H_SYNC_OFFSET + H_SYNC_WIDTH);
903 var->upper_margin = V_BLANKING - V_SYNC_OFFSET -
905 var->lower_margin = V_SYNC_OFFSET;
906 var->hsync_len = H_SYNC_WIDTH;
907 var->vsync_len = V_SYNC_WIDTH;
908 var->pixclock = PIXEL_CLOCK;
909 var->pixclock /= 1000;
910 var->pixclock = KHZ2PICOS(var->pixclock);
913 var->sync |= FB_SYNC_HOR_HIGH_ACT;
915 var->sync |= FB_SYNC_VERT_HIGH_ACT;
922 void fb_edid_to_monspecs(unsigned char *edid, struct fb_monspecs *specs)
924 unsigned char *block;
930 if (!(edid_checksum(edid)))
933 if (!(edid_check_header(edid)))
936 memset(specs, 0, sizeof(struct fb_monspecs));
938 specs->version = edid[EDID_STRUCT_VERSION];
939 specs->revision = edid[EDID_STRUCT_REVISION];
941 DPRINTK("========================================\n");
942 DPRINTK("Display Information (EDID)\n");
943 DPRINTK("========================================\n");
944 DPRINTK(" EDID Version %d.%d\n", (int) specs->version,
945 (int) specs->revision);
947 parse_vendor_block(edid + ID_MANUFACTURER_NAME, specs);
949 block = edid + DETAILED_TIMING_DESCRIPTIONS_START;
950 for (i = 0; i < 4; i++, block += DETAILED_TIMING_DESCRIPTION_SIZE) {
951 if (edid_is_serial_block(block)) {
952 copy_string(block, specs->serial_no);
953 DPRINTK(" Serial Number: %s\n", specs->serial_no);
954 } else if (edid_is_ascii_block(block)) {
955 copy_string(block, specs->ascii);
956 DPRINTK(" ASCII Block: %s\n", specs->ascii);
957 } else if (edid_is_monitor_block(block)) {
958 copy_string(block, specs->monitor);
959 DPRINTK(" Monitor Name: %s\n", specs->monitor);
963 DPRINTK(" Display Characteristics:\n");
964 get_monspecs(edid, specs);
966 specs->modedb = fb_create_modedb(edid, &specs->modedb_len);
969 * Workaround for buggy EDIDs that sets that the first
970 * detailed timing is preferred but has not detailed
973 for (i = 0; i < specs->modedb_len; i++) {
974 if (specs->modedb[i].flag & FB_MODE_IS_DETAILED) {
981 specs->misc &= ~FB_MISC_1ST_DETAIL;
983 DPRINTK("========================================\n");
987 * fb_edid_add_monspecs() - add monitor video modes from E-EDID data
988 * @edid: 128 byte array with an E-EDID block
989 * @specs: monitor specs to be extended
991 void fb_edid_add_monspecs(unsigned char *edid, struct fb_monspecs *specs)
993 unsigned char *block;
994 struct fb_videomode *m;
996 u8 svd[64], edt[(128 - 4) / DETAILED_TIMING_DESCRIPTION_SIZE];
997 u8 pos = 4, svd_n = 0;
1002 if (!edid_checksum(edid))
1005 if (edid[0] != 0x2 ||
1006 edid[2] < 4 || edid[2] > 128)
1009 DPRINTK(" Short Video Descriptors\n");
1011 while (pos < edid[2]) {
1012 u8 len = edid[pos] & 0x1f, type = (edid[pos] >> 5) & 7;
1013 pr_debug("Data block %u of %u bytes\n", type, len);
1017 for (i = pos; i < pos + len; i++) {
1018 u8 idx = edid[i] & 0x7f;
1020 pr_debug("N%sative mode #%d\n",
1021 edid[i] & 0x80 ? "" : "on-n", idx);
1023 } else if (type == 3 && len >= 3) {
1024 u32 ieee_reg = edid[pos] | (edid[pos + 1] << 8) |
1025 (edid[pos + 2] << 16);
1026 if (ieee_reg == 0x000c03)
1027 specs->misc |= FB_MISC_HDMI;
1033 block = edid + edid[2];
1035 DPRINTK(" Extended Detailed Timings\n");
1037 for (i = 0; i < (128 - edid[2]) / DETAILED_TIMING_DESCRIPTION_SIZE;
1038 i++, block += DETAILED_TIMING_DESCRIPTION_SIZE)
1040 edt[num++] = block - edid;
1042 /* Yikes, EDID data is totally useless */
1046 m = kzalloc((specs->modedb_len + num + svd_n) *
1047 sizeof(struct fb_videomode), GFP_KERNEL);
1052 memcpy(m, specs->modedb, specs->modedb_len * sizeof(struct fb_videomode));
1054 for (i = specs->modedb_len; i < specs->modedb_len + num; i++) {
1055 get_detailed_timing(edid + edt[i - specs->modedb_len], &m[i]);
1056 if (i == specs->modedb_len)
1057 m[i].flag |= FB_MODE_IS_FIRST;
1058 pr_debug("Adding %ux%u@%u\n", m[i].xres, m[i].yres, m[i].refresh);
1061 for (i = specs->modedb_len + num; i < specs->modedb_len + num + svd_n; i++) {
1062 int idx = svd[i - specs->modedb_len - num];
1063 if (!idx || idx > (CEA_MODEDB_SIZE - 1)) {
1064 pr_warning("Reserved SVD code %d\n", idx);
1066 memcpy(&m[i], cea_modes + idx, sizeof(m[i]));
1067 pr_debug("Adding SVD #%d: %ux%u@%u\n", idx,
1068 m[i].xres, m[i].yres, m[i].refresh);
1072 kfree(specs->modedb);
1074 specs->modedb_len = specs->modedb_len + num + svd_n;
1078 * VESA Generalized Timing Formula (GTF)
1082 #define V_FRONTPORCH 1
1084 #define H_SCALEFACTOR 20
1085 #define H_BLANKSCALE 128
1086 #define H_GRADIENT 600
1090 struct __fb_timings {
1103 * fb_get_vblank - get vertical blank time
1104 * @hfreq: horizontal freq
1107 * vblank = right_margin + vsync_len + left_margin
1109 * given: right_margin = 1 (V_FRONTPORCH)
1114 * left_margin = --------------- - vsync_len
1117 static u32 fb_get_vblank(u32 hfreq)
1121 vblank = (hfreq * FLYBACK)/1000;
1122 vblank = (vblank + 500)/1000;
1123 return (vblank + V_FRONTPORCH);
1127 * fb_get_hblank_by_freq - get horizontal blank time given hfreq
1128 * @hfreq: horizontal freq
1129 * @xres: horizontal resolution in pixels
1134 * hblank = ------------------
1137 * duty cycle = percent of htotal assigned to inactive display
1138 * duty cycle = C - (M/Hfreq)
1140 * where: C = ((offset - scale factor) * blank_scale)
1141 * -------------------------------------- + scale factor
1143 * M = blank_scale * gradient
1146 static u32 fb_get_hblank_by_hfreq(u32 hfreq, u32 xres)
1148 u32 c_val, m_val, duty_cycle, hblank;
1150 c_val = (((H_OFFSET - H_SCALEFACTOR) * H_BLANKSCALE)/256 +
1151 H_SCALEFACTOR) * 1000;
1152 m_val = (H_BLANKSCALE * H_GRADIENT)/256;
1153 m_val = (m_val * 1000000)/hfreq;
1154 duty_cycle = c_val - m_val;
1155 hblank = (xres * duty_cycle)/(100000 - duty_cycle);
1160 * fb_get_hblank_by_dclk - get horizontal blank time given pixelclock
1161 * @dclk: pixelclock in Hz
1162 * @xres: horizontal resolution in pixels
1167 * hblank = ------------------
1170 * duty cycle = percent of htotal assigned to inactive display
1171 * duty cycle = C - (M * h_period)
1173 * where: h_period = SQRT(100 - C + (0.4 * xres * M)/dclk) + C - 100
1174 * -----------------------------------------------
1180 static u32 fb_get_hblank_by_dclk(u32 dclk, u32 xres)
1182 u32 duty_cycle, h_period, hblank;
1185 h_period = 100 - C_VAL;
1186 h_period *= h_period;
1187 h_period += (M_VAL * xres * 2 * 1000)/(5 * dclk);
1190 h_period = int_sqrt(h_period);
1191 h_period -= (100 - C_VAL) * 100;
1193 h_period /= 2 * M_VAL;
1195 duty_cycle = C_VAL * 1000 - (M_VAL * h_period)/100;
1196 hblank = (xres * duty_cycle)/(100000 - duty_cycle) + 8;
1202 * fb_get_hfreq - estimate hsync
1203 * @vfreq: vertical refresh rate
1204 * @yres: vertical resolution
1208 * (yres + front_port) * vfreq * 1000000
1209 * hfreq = -------------------------------------
1210 * (1000000 - (vfreq * FLYBACK)
1214 static u32 fb_get_hfreq(u32 vfreq, u32 yres)
1218 divisor = (1000000 - (vfreq * FLYBACK))/1000;
1219 hfreq = (yres + V_FRONTPORCH) * vfreq * 1000;
1220 return (hfreq/divisor);
1223 static void fb_timings_vfreq(struct __fb_timings *timings)
1225 timings->hfreq = fb_get_hfreq(timings->vfreq, timings->vactive);
1226 timings->vblank = fb_get_vblank(timings->hfreq);
1227 timings->vtotal = timings->vactive + timings->vblank;
1228 timings->hblank = fb_get_hblank_by_hfreq(timings->hfreq,
1230 timings->htotal = timings->hactive + timings->hblank;
1231 timings->dclk = timings->htotal * timings->hfreq;
1234 static void fb_timings_hfreq(struct __fb_timings *timings)
1236 timings->vblank = fb_get_vblank(timings->hfreq);
1237 timings->vtotal = timings->vactive + timings->vblank;
1238 timings->vfreq = timings->hfreq/timings->vtotal;
1239 timings->hblank = fb_get_hblank_by_hfreq(timings->hfreq,
1241 timings->htotal = timings->hactive + timings->hblank;
1242 timings->dclk = timings->htotal * timings->hfreq;
1245 static void fb_timings_dclk(struct __fb_timings *timings)
1247 timings->hblank = fb_get_hblank_by_dclk(timings->dclk,
1249 timings->htotal = timings->hactive + timings->hblank;
1250 timings->hfreq = timings->dclk/timings->htotal;
1251 timings->vblank = fb_get_vblank(timings->hfreq);
1252 timings->vtotal = timings->vactive + timings->vblank;
1253 timings->vfreq = timings->hfreq/timings->vtotal;
1257 * fb_get_mode - calculates video mode using VESA GTF
1258 * @flags: if: 0 - maximize vertical refresh rate
1259 * 1 - vrefresh-driven calculation;
1260 * 2 - hscan-driven calculation;
1261 * 3 - pixelclock-driven calculation;
1262 * @val: depending on @flags, ignored, vrefresh, hsync or pixelclock
1263 * @var: pointer to fb_var_screeninfo
1264 * @info: pointer to fb_info
1267 * Calculates video mode based on monitor specs using VESA GTF.
1268 * The GTF is best for VESA GTF compliant monitors but is
1269 * specifically formulated to work for older monitors as well.
1271 * If @flag==0, the function will attempt to maximize the
1272 * refresh rate. Otherwise, it will calculate timings based on
1273 * the flag and accompanying value.
1275 * If FB_IGNOREMON bit is set in @flags, monitor specs will be
1276 * ignored and @var will be filled with the calculated timings.
1278 * All calculations are based on the VESA GTF Spreadsheet
1279 * available at VESA's public ftp (http://www.vesa.org).
1282 * The timings generated by the GTF will be different from VESA
1283 * DMT. It might be a good idea to keep a table of standard
1284 * VESA modes as well. The GTF may also not work for some displays,
1285 * such as, and especially, analog TV.
1288 * A valid info->monspecs, otherwise 'safe numbers' will be used.
1290 int fb_get_mode(int flags, u32 val, struct fb_var_screeninfo *var, struct fb_info *info)
1292 struct __fb_timings *timings;
1293 u32 interlace = 1, dscan = 1;
1294 u32 hfmin, hfmax, vfmin, vfmax, dclkmin, dclkmax, err = 0;
1297 timings = kzalloc(sizeof(struct __fb_timings), GFP_KERNEL);
1303 * If monspecs are invalid, use values that are enough
1306 if (!info || !info->monspecs.hfmax || !info->monspecs.vfmax ||
1307 !info->monspecs.dclkmax ||
1308 info->monspecs.hfmax < info->monspecs.hfmin ||
1309 info->monspecs.vfmax < info->monspecs.vfmin ||
1310 info->monspecs.dclkmax < info->monspecs.dclkmin) {
1311 hfmin = 29000; hfmax = 30000;
1312 vfmin = 60; vfmax = 60;
1313 dclkmin = 0; dclkmax = 25000000;
1315 hfmin = info->monspecs.hfmin;
1316 hfmax = info->monspecs.hfmax;
1317 vfmin = info->monspecs.vfmin;
1318 vfmax = info->monspecs.vfmax;
1319 dclkmin = info->monspecs.dclkmin;
1320 dclkmax = info->monspecs.dclkmax;
1323 timings->hactive = var->xres;
1324 timings->vactive = var->yres;
1325 if (var->vmode & FB_VMODE_INTERLACED) {
1326 timings->vactive /= 2;
1329 if (var->vmode & FB_VMODE_DOUBLE) {
1330 timings->vactive *= 2;
1334 switch (flags & ~FB_IGNOREMON) {
1335 case FB_MAXTIMINGS: /* maximize refresh rate */
1336 timings->hfreq = hfmax;
1337 fb_timings_hfreq(timings);
1338 if (timings->vfreq > vfmax) {
1339 timings->vfreq = vfmax;
1340 fb_timings_vfreq(timings);
1342 if (timings->dclk > dclkmax) {
1343 timings->dclk = dclkmax;
1344 fb_timings_dclk(timings);
1347 case FB_VSYNCTIMINGS: /* vrefresh driven */
1348 timings->vfreq = val;
1349 fb_timings_vfreq(timings);
1351 case FB_HSYNCTIMINGS: /* hsync driven */
1352 timings->hfreq = val;
1353 fb_timings_hfreq(timings);
1355 case FB_DCLKTIMINGS: /* pixelclock driven */
1356 timings->dclk = PICOS2KHZ(val) * 1000;
1357 fb_timings_dclk(timings);
1364 if (err || (!(flags & FB_IGNOREMON) &&
1365 (timings->vfreq < vfmin || timings->vfreq > vfmax ||
1366 timings->hfreq < hfmin || timings->hfreq > hfmax ||
1367 timings->dclk < dclkmin || timings->dclk > dclkmax))) {
1370 var->pixclock = KHZ2PICOS(timings->dclk/1000);
1371 var->hsync_len = (timings->htotal * 8)/100;
1372 var->right_margin = (timings->hblank/2) - var->hsync_len;
1373 var->left_margin = timings->hblank - var->right_margin -
1375 var->vsync_len = (3 * interlace)/dscan;
1376 var->lower_margin = (1 * interlace)/dscan;
1377 var->upper_margin = (timings->vblank * interlace)/dscan -
1378 (var->vsync_len + var->lower_margin);
1385 int fb_parse_edid(unsigned char *edid, struct fb_var_screeninfo *var)
1389 void fb_edid_to_monspecs(unsigned char *edid, struct fb_monspecs *specs)
1393 void fb_edid_add_monspecs(unsigned char *edid, struct fb_monspecs *specs)
1396 void fb_destroy_modedb(struct fb_videomode *modedb)
1399 int fb_get_mode(int flags, u32 val, struct fb_var_screeninfo *var,
1400 struct fb_info *info)
1404 #endif /* CONFIG_FB_MODE_HELPERS */
1407 * fb_validate_mode - validates var against monitor capabilities
1408 * @var: pointer to fb_var_screeninfo
1409 * @info: pointer to fb_info
1412 * Validates video mode against monitor capabilities specified in
1416 * A valid info->monspecs.
1418 int fb_validate_mode(const struct fb_var_screeninfo *var, struct fb_info *info)
1420 u32 hfreq, vfreq, htotal, vtotal, pixclock;
1421 u32 hfmin, hfmax, vfmin, vfmax, dclkmin, dclkmax;
1424 * If monspecs are invalid, use values that are enough
1427 if (!info->monspecs.hfmax || !info->monspecs.vfmax ||
1428 !info->monspecs.dclkmax ||
1429 info->monspecs.hfmax < info->monspecs.hfmin ||
1430 info->monspecs.vfmax < info->monspecs.vfmin ||
1431 info->monspecs.dclkmax < info->monspecs.dclkmin) {
1432 hfmin = 29000; hfmax = 30000;
1433 vfmin = 60; vfmax = 60;
1434 dclkmin = 0; dclkmax = 25000000;
1436 hfmin = info->monspecs.hfmin;
1437 hfmax = info->monspecs.hfmax;
1438 vfmin = info->monspecs.vfmin;
1439 vfmax = info->monspecs.vfmax;
1440 dclkmin = info->monspecs.dclkmin;
1441 dclkmax = info->monspecs.dclkmax;
1446 pixclock = PICOS2KHZ(var->pixclock) * 1000;
1448 htotal = var->xres + var->right_margin + var->hsync_len +
1450 vtotal = var->yres + var->lower_margin + var->vsync_len +
1453 if (var->vmode & FB_VMODE_INTERLACED)
1455 if (var->vmode & FB_VMODE_DOUBLE)
1458 hfreq = pixclock/htotal;
1459 hfreq = (hfreq + 500) / 1000 * 1000;
1461 vfreq = hfreq/vtotal;
1463 return (vfreq < vfmin || vfreq > vfmax ||
1464 hfreq < hfmin || hfreq > hfmax ||
1465 pixclock < dclkmin || pixclock > dclkmax) ?
1469 #if defined(CONFIG_FIRMWARE_EDID) && defined(CONFIG_X86)
1472 * We need to ensure that the EDID block is only returned for
1473 * the primary graphics adapter.
1476 const unsigned char *fb_firmware_edid(struct device *device)
1478 struct pci_dev *dev = NULL;
1479 struct resource *res = NULL;
1480 unsigned char *edid = NULL;
1483 dev = to_pci_dev(device);
1486 res = &dev->resource[PCI_ROM_RESOURCE];
1488 if (res && res->flags & IORESOURCE_ROM_SHADOW)
1489 edid = edid_info.dummy;
1494 const unsigned char *fb_firmware_edid(struct device *device)
1499 EXPORT_SYMBOL(fb_firmware_edid);
1501 EXPORT_SYMBOL(fb_parse_edid);
1502 EXPORT_SYMBOL(fb_edid_to_monspecs);
1503 EXPORT_SYMBOL(fb_edid_add_monspecs);
1504 EXPORT_SYMBOL(fb_get_mode);
1505 EXPORT_SYMBOL(fb_validate_mode);
1506 EXPORT_SYMBOL(fb_destroy_modedb);