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>
42 #undef DEBUG /* define this for verbose EDID parsing output */
45 #define DPRINTK(fmt, args...) printk(fmt,## args)
47 #define DPRINTK(fmt, args...)
50 #define FBMON_FIX_HEADER 1
51 #define FBMON_FIX_INPUT 2
52 #define FBMON_FIX_TIMINGS 3
54 #ifdef CONFIG_FB_MODE_HELPERS
61 static const struct broken_edid brokendb[] = {
64 .manufacturer = "DEC",
66 .fix = FBMON_FIX_HEADER,
68 /* ViewSonic PF775a */
70 .manufacturer = "VSC",
72 .fix = FBMON_FIX_INPUT,
76 .manufacturer = "SHP",
78 .fix = FBMON_FIX_TIMINGS,
82 static const unsigned char edid_v1_header[] = { 0x00, 0xff, 0xff, 0xff,
83 0xff, 0xff, 0xff, 0x00
86 static void copy_string(unsigned char *c, unsigned char *s)
90 for (i = 0; (i < 13 && *c != 0x0A); i++)
93 while (i-- && (*--s == 0x20)) *s = 0;
96 static int edid_is_serial_block(unsigned char *block)
98 if ((block[0] == 0x00) && (block[1] == 0x00) &&
99 (block[2] == 0x00) && (block[3] == 0xff) &&
106 static int edid_is_ascii_block(unsigned char *block)
108 if ((block[0] == 0x00) && (block[1] == 0x00) &&
109 (block[2] == 0x00) && (block[3] == 0xfe) &&
116 static int edid_is_limits_block(unsigned char *block)
118 if ((block[0] == 0x00) && (block[1] == 0x00) &&
119 (block[2] == 0x00) && (block[3] == 0xfd) &&
126 static int edid_is_monitor_block(unsigned char *block)
128 if ((block[0] == 0x00) && (block[1] == 0x00) &&
129 (block[2] == 0x00) && (block[3] == 0xfc) &&
136 static int edid_is_timing_block(unsigned char *block)
138 if ((block[0] != 0x00) || (block[1] != 0x00) ||
139 (block[2] != 0x00) || (block[4] != 0x00))
145 static int check_edid(unsigned char *edid)
147 unsigned char *block = edid + ID_MANUFACTURER_NAME, manufacturer[4];
150 int i, fix = 0, ret = 0;
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) + '@';
157 model = block[2] + (block[3] << 8);
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;
168 case FBMON_FIX_HEADER:
169 for (i = 0; i < 8; i++) {
170 if (edid[i] != edid_v1_header[i]) {
176 case FBMON_FIX_INPUT:
177 b = edid + EDID_STRUCT_DISPLAY;
178 /* Only if display is GTF capable will
179 the input type be reset to analog */
180 if (b[4] & 0x01 && b[0] & 0x80)
183 case FBMON_FIX_TIMINGS:
184 b = edid + DETAILED_TIMING_DESCRIPTIONS_START;
187 for (i = 0; i < 4; i++) {
188 if (edid_is_limits_block(b)) {
193 b += DETAILED_TIMING_DESCRIPTION_SIZE;
200 printk("fbmon: The EDID Block of "
201 "Manufacturer: %s Model: 0x%x is known to "
202 "be broken,\n", manufacturer, model);
207 static void fix_edid(unsigned char *edid, int fix)
210 unsigned char *b, csum = 0;
213 case FBMON_FIX_HEADER:
214 printk("fbmon: trying a header reconstruct\n");
215 memcpy(edid, edid_v1_header, 8);
217 case FBMON_FIX_INPUT:
218 printk("fbmon: trying to fix input type\n");
219 b = edid + EDID_STRUCT_DISPLAY;
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))) {
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*/
245 b += DETAILED_TIMING_DESCRIPTION_SIZE;
248 for (i = 0; i < EDID_LENGTH - 1; i++)
251 edid[127] = 256 - csum;
256 static int edid_checksum(unsigned char *edid)
258 unsigned char csum = 0, all_null = 0;
259 int i, err = 0, fix = check_edid(edid);
264 for (i = 0; i < EDID_LENGTH; i++) {
269 if (csum == 0x00 && all_null) {
270 /* checksum passed, everything's good */
277 static int edid_check_header(unsigned char *edid)
279 int i, err = 1, fix = check_edid(edid);
284 for (i = 0; i < 8; i++) {
285 if (edid[i] != edid_v1_header[i])
292 static void parse_vendor_block(unsigned char *block, struct fb_monspecs *specs)
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);
310 static void get_dpms_capabilities(unsigned char flags,
311 struct fb_monspecs *specs)
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");
326 static void get_chroma(unsigned char *block, struct fb_monspecs *specs)
330 DPRINTK(" Chroma\n");
331 /* Chromaticity data */
332 tmp = ((block[5] & (3 << 6)) >> 6) | (block[0x7] << 2);
335 specs->chroma.redx = tmp/1024;
336 DPRINTK(" RedX: 0.%03d ", specs->chroma.redx);
338 tmp = ((block[5] & (3 << 4)) >> 4) | (block[0x8] << 2);
341 specs->chroma.redy = tmp/1024;
342 DPRINTK("RedY: 0.%03d\n", specs->chroma.redy);
344 tmp = ((block[5] & (3 << 2)) >> 2) | (block[0x9] << 2);
347 specs->chroma.greenx = tmp/1024;
348 DPRINTK(" GreenX: 0.%03d ", specs->chroma.greenx);
350 tmp = (block[5] & 3) | (block[0xa] << 2);
353 specs->chroma.greeny = tmp/1024;
354 DPRINTK("GreenY: 0.%03d\n", specs->chroma.greeny);
356 tmp = ((block[6] & (3 << 6)) >> 6) | (block[0xb] << 2);
359 specs->chroma.bluex = tmp/1024;
360 DPRINTK(" BlueX: 0.%03d ", specs->chroma.bluex);
362 tmp = ((block[6] & (3 << 4)) >> 4) | (block[0xc] << 2);
365 specs->chroma.bluey = tmp/1024;
366 DPRINTK("BlueY: 0.%03d\n", specs->chroma.bluey);
368 tmp = ((block[6] & (3 << 2)) >> 2) | (block[0xd] << 2);
371 specs->chroma.whitex = tmp/1024;
372 DPRINTK(" WhiteX: 0.%03d ", specs->chroma.whitex);
374 tmp = (block[6] & 3) | (block[0xe] << 2);
377 specs->chroma.whitey = tmp/1024;
378 DPRINTK("WhiteY: 0.%03d\n", specs->chroma.whitey);
381 static void calc_mode_timings(int xres, int yres, int refresh,
382 struct fb_videomode *mode)
384 struct fb_var_screeninfo *var;
386 var = kzalloc(sizeof(struct fb_var_screeninfo), GFP_KERNEL);
391 fb_get_mode(FB_VSYNCTIMINGS | FB_IGNOREMON,
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;
409 static int get_est_timing(unsigned char *block, struct fb_videomode *mode)
416 calc_mode_timings(720, 400, 70, &mode[num]);
417 mode[num++].flag = FB_MODE_IS_CALCULATED;
418 DPRINTK(" 720x400@70Hz\n");
421 calc_mode_timings(720, 400, 88, &mode[num]);
422 mode[num++].flag = FB_MODE_IS_CALCULATED;
423 DPRINTK(" 720x400@88Hz\n");
426 mode[num++] = vesa_modes[3];
427 DPRINTK(" 640x480@60Hz\n");
430 calc_mode_timings(640, 480, 67, &mode[num]);
431 mode[num++].flag = FB_MODE_IS_CALCULATED;
432 DPRINTK(" 640x480@67Hz\n");
435 mode[num++] = vesa_modes[4];
436 DPRINTK(" 640x480@72Hz\n");
439 mode[num++] = vesa_modes[5];
440 DPRINTK(" 640x480@75Hz\n");
443 mode[num++] = vesa_modes[7];
444 DPRINTK(" 800x600@56Hz\n");
447 mode[num++] = vesa_modes[8];
448 DPRINTK(" 800x600@60Hz\n");
453 mode[num++] = vesa_modes[9];
454 DPRINTK(" 800x600@72Hz\n");
457 mode[num++] = vesa_modes[10];
458 DPRINTK(" 800x600@75Hz\n");
461 calc_mode_timings(832, 624, 75, &mode[num]);
462 mode[num++].flag = FB_MODE_IS_CALCULATED;
463 DPRINTK(" 832x624@75Hz\n");
466 mode[num++] = vesa_modes[12];
467 DPRINTK(" 1024x768@87Hz Interlaced\n");
470 mode[num++] = vesa_modes[13];
471 DPRINTK(" 1024x768@60Hz\n");
474 mode[num++] = vesa_modes[14];
475 DPRINTK(" 1024x768@70Hz\n");
478 mode[num++] = vesa_modes[15];
479 DPRINTK(" 1024x768@75Hz\n");
482 mode[num++] = vesa_modes[21];
483 DPRINTK(" 1280x1024@75Hz\n");
487 mode[num++] = vesa_modes[17];
488 DPRINTK(" 1152x870@75Hz\n");
490 DPRINTK(" Manufacturer's mask: %x\n",c&0x7F);
494 static int get_std_timing(unsigned char *block, struct fb_videomode *mode,
495 int ver, int rev, const struct fb_monspecs *specs)
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)
505 if (i < DMT_SIZE && dmt_modes[i].mode) {
507 *mode = *dmt_modes[i].mode;
508 mode->flag |= FB_MODE_IS_STANDARD;
509 DPRINTK(" DMT id=%d\n", dmt_modes[i].dmt_id);
512 int xres, yres = 0, refresh, ratio;
514 xres = (block[0] + 31) * 8;
518 ratio = (block[1] & 0xc0) >> 6;
521 /* in EDID 1.3 the meaning of 0 changed to 16:10 (prior 1:1) */
522 if (ver < 1 || (ver == 1 && rev < 3))
525 yres = (xres * 10)/16;
534 yres = (xres * 9)/16;
537 refresh = (block[1] & 0x3f) + 60;
538 DPRINTK(" %dx%d@%dHz\n", xres, yres, refresh);
540 calc_mode_timings(xres, yres, refresh, mode);
543 /* Check the mode we got is within valid spec of the monitor */
544 if (specs && specs->dclkmax
545 && PICOS2KHZ(mode->pixclock) * 1000 > specs->dclkmax) {
546 DPRINTK(" mode exceed max DCLK\n");
553 static int get_dst_timing(unsigned char *block, struct fb_videomode *mode,
554 int ver, int rev, const struct fb_monspecs *specs)
558 for (j = 0; j < 6; j++, block += STD_TIMING_DESCRIPTION_SIZE)
559 num += get_std_timing(block, &mode[num], ver, rev, specs);
564 static void get_detailed_timing(unsigned char *block,
565 struct fb_videomode *mode)
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 -
577 mode->lower_margin = V_SYNC_OFFSET;
578 mode->hsync_len = H_SYNC_WIDTH;
579 mode->vsync_len = V_SYNC_WIDTH;
581 mode->sync |= FB_SYNC_HOR_HIGH_ACT;
583 mode->sync |= FB_SYNC_VERT_HIGH_ACT;
584 mode->refresh = PIXEL_CLOCK/((H_ACTIVE + H_BLANKING) *
585 (V_ACTIVE + V_BLANKING));
588 mode->upper_margin *= 2;
589 mode->lower_margin *= 2;
590 mode->vsync_len *= 2;
591 mode->vmode |= FB_VMODE_INTERLACED;
593 mode->flag = FB_MODE_IS_DETAILED;
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) ? "+" : "-");
605 * fb_create_modedb - create video mode database
607 * @dbsize: database size
609 * RETURNS: struct fb_videomode, @dbsize contains length of database
612 * This function builds a mode database using the contents of the EDID
615 static struct fb_videomode *fb_create_modedb(unsigned char *edid, int *dbsize,
616 const struct fb_monspecs *specs)
618 struct fb_videomode *mode, *m;
619 unsigned char *block;
620 int num = 0, i, first = 1;
623 mode = kzalloc(50 * sizeof(struct fb_videomode), GFP_KERNEL);
627 if (edid == NULL || !edid_checksum(edid) ||
628 !edid_check_header(edid)) {
633 ver = edid[EDID_STRUCT_VERSION];
634 rev = edid[EDID_STRUCT_REVISION];
638 DPRINTK(" Detailed Timings\n");
639 block = edid + DETAILED_TIMING_DESCRIPTIONS_START;
640 for (i = 0; i < 4; i++, block+= DETAILED_TIMING_DESCRIPTION_SIZE) {
641 if (!(block[0] == 0x00 && block[1] == 0x00)) {
642 get_detailed_timing(block, &mode[num]);
644 mode[num].flag |= FB_MODE_IS_FIRST;
651 DPRINTK(" Supported VESA Modes\n");
652 block = edid + ESTABLISHED_TIMING_1;
653 num += get_est_timing(block, &mode[num]);
655 DPRINTK(" Standard Timings\n");
656 block = edid + STD_TIMING_DESCRIPTIONS_START;
657 for (i = 0; i < STD_TIMING; i++, block += STD_TIMING_DESCRIPTION_SIZE)
658 num += get_std_timing(block, &mode[num], ver, rev, specs);
660 block = edid + DETAILED_TIMING_DESCRIPTIONS_START;
661 for (i = 0; i < 4; i++, block+= DETAILED_TIMING_DESCRIPTION_SIZE) {
662 if (block[0] == 0x00 && block[1] == 0x00 && block[3] == 0xfa)
663 num += get_dst_timing(block + 5, &mode[num],
667 /* Yikes, EDID data is totally useless */
674 m = kmalloc(num * sizeof(struct fb_videomode), GFP_KERNEL);
677 memmove(m, mode, num * sizeof(struct fb_videomode));
683 * fb_destroy_modedb - destroys mode database
684 * @modedb: mode database to destroy
687 * Destroy mode database created by fb_create_modedb
689 void fb_destroy_modedb(struct fb_videomode *modedb)
694 static int fb_get_monitor_limits(unsigned char *edid, struct fb_monspecs *specs)
697 unsigned char *block;
699 block = edid + DETAILED_TIMING_DESCRIPTIONS_START;
701 DPRINTK(" Monitor Operating Limits: ");
703 for (i = 0; i < 4; i++, block += DETAILED_TIMING_DESCRIPTION_SIZE) {
704 if (edid_is_limits_block(block)) {
705 specs->hfmin = H_MIN_RATE * 1000;
706 specs->hfmax = H_MAX_RATE * 1000;
707 specs->vfmin = V_MIN_RATE;
708 specs->vfmax = V_MAX_RATE;
709 specs->dclkmax = MAX_PIXEL_CLOCK * 1000000;
710 specs->gtf = (GTF_SUPPORT) ? 1 : 0;
712 DPRINTK("From EDID\n");
717 /* estimate monitor limits based on modes supported */
719 struct fb_videomode *modes, *mode;
720 int num_modes, hz, hscan, pixclock;
723 modes = fb_create_modedb(edid, &num_modes, specs);
725 DPRINTK("None Available\n");
730 for (i = 0; i < num_modes; i++) {
732 pixclock = PICOS2KHZ(modes[i].pixclock) * 1000;
733 htotal = mode->xres + mode->right_margin + mode->hsync_len
735 vtotal = mode->yres + mode->lower_margin + mode->vsync_len
736 + mode->upper_margin;
738 if (mode->vmode & FB_VMODE_INTERLACED)
741 if (mode->vmode & FB_VMODE_DOUBLE)
744 hscan = (pixclock + htotal / 2) / htotal;
745 hscan = (hscan + 500) / 1000 * 1000;
746 hz = (hscan + vtotal / 2) / vtotal;
748 if (specs->dclkmax == 0 || specs->dclkmax < pixclock)
749 specs->dclkmax = pixclock;
751 if (specs->dclkmin == 0 || specs->dclkmin > pixclock)
752 specs->dclkmin = pixclock;
754 if (specs->hfmax == 0 || specs->hfmax < hscan)
755 specs->hfmax = hscan;
757 if (specs->hfmin == 0 || specs->hfmin > hscan)
758 specs->hfmin = hscan;
760 if (specs->vfmax == 0 || specs->vfmax < hz)
763 if (specs->vfmin == 0 || specs->vfmin > hz)
766 DPRINTK("Extrapolated\n");
767 fb_destroy_modedb(modes);
769 DPRINTK(" H: %d-%dKHz V: %d-%dHz DCLK: %dMHz\n",
770 specs->hfmin/1000, specs->hfmax/1000, specs->vfmin,
771 specs->vfmax, specs->dclkmax/1000000);
775 static void get_monspecs(unsigned char *edid, struct fb_monspecs *specs)
777 unsigned char c, *block;
779 block = edid + EDID_STRUCT_DISPLAY;
781 fb_get_monitor_limits(edid, specs);
786 specs->input |= FB_DISP_DDI;
787 DPRINTK(" Digital Display Input");
789 DPRINTK(" Analog Display Input: Input Voltage - ");
790 switch ((block[0] & 0x60) >> 5) {
792 DPRINTK("0.700V/0.300V");
793 specs->input |= FB_DISP_ANA_700_300;
796 DPRINTK("0.714V/0.286V");
797 specs->input |= FB_DISP_ANA_714_286;
800 DPRINTK("1.000V/0.400V");
801 specs->input |= FB_DISP_ANA_1000_400;
804 DPRINTK("0.700V/0.000V");
805 specs->input |= FB_DISP_ANA_700_000;
809 DPRINTK("\n Sync: ");
812 DPRINTK(" Configurable signal level\n");
816 DPRINTK("Blank to Blank ");
817 specs->signal |= FB_SIGNAL_BLANK_BLANK;
820 DPRINTK("Separate ");
821 specs->signal |= FB_SIGNAL_SEPARATE;
824 DPRINTK("Composite ");
825 specs->signal |= FB_SIGNAL_COMPOSITE;
828 DPRINTK("Sync on Green ");
829 specs->signal |= FB_SIGNAL_SYNC_ON_GREEN;
832 DPRINTK("Serration on ");
833 specs->signal |= FB_SIGNAL_SERRATION_ON;
836 specs->max_x = block[1];
837 specs->max_y = block[2];
838 DPRINTK(" Max H-size in cm: ");
840 DPRINTK("%d\n", specs->max_x);
842 DPRINTK("variable\n");
843 DPRINTK(" Max V-size in cm: ");
845 DPRINTK("%d\n", specs->max_y);
847 DPRINTK("variable\n");
850 specs->gamma = c+100;
852 DPRINTK("%d.%d\n", specs->gamma/100, specs->gamma % 100);
854 get_dpms_capabilities(block[4], specs);
856 switch ((block[4] & 0x18) >> 3) {
858 DPRINTK(" Monochrome/Grayscale\n");
859 specs->input |= FB_DISP_MONO;
862 DPRINTK(" RGB Color Display\n");
863 specs->input |= FB_DISP_RGB;
866 DPRINTK(" Non-RGB Multicolor Display\n");
867 specs->input |= FB_DISP_MULTI;
870 DPRINTK(" Unknown\n");
871 specs->input |= FB_DISP_UNKNOWN;
875 get_chroma(block, specs);
880 DPRINTK(" Default color format is primary\n");
881 specs->misc |= FB_MISC_PRIM_COLOR;
884 DPRINTK(" First DETAILED Timing is preferred\n");
885 specs->misc |= FB_MISC_1ST_DETAIL;
888 printk(" Display is GTF capable\n");
893 int fb_parse_edid(unsigned char *edid, struct fb_var_screeninfo *var)
896 unsigned char *block;
898 if (edid == NULL || var == NULL)
901 if (!(edid_checksum(edid)))
904 if (!(edid_check_header(edid)))
907 block = edid + DETAILED_TIMING_DESCRIPTIONS_START;
909 for (i = 0; i < 4; i++, block += DETAILED_TIMING_DESCRIPTION_SIZE) {
910 if (edid_is_timing_block(block)) {
911 var->xres = var->xres_virtual = H_ACTIVE;
912 var->yres = var->yres_virtual = V_ACTIVE;
913 var->height = var->width = 0;
914 var->right_margin = H_SYNC_OFFSET;
915 var->left_margin = (H_ACTIVE + H_BLANKING) -
916 (H_ACTIVE + H_SYNC_OFFSET + H_SYNC_WIDTH);
917 var->upper_margin = V_BLANKING - V_SYNC_OFFSET -
919 var->lower_margin = V_SYNC_OFFSET;
920 var->hsync_len = H_SYNC_WIDTH;
921 var->vsync_len = V_SYNC_WIDTH;
922 var->pixclock = PIXEL_CLOCK;
923 var->pixclock /= 1000;
924 var->pixclock = KHZ2PICOS(var->pixclock);
927 var->sync |= FB_SYNC_HOR_HIGH_ACT;
929 var->sync |= FB_SYNC_VERT_HIGH_ACT;
936 void fb_edid_to_monspecs(unsigned char *edid, struct fb_monspecs *specs)
938 unsigned char *block;
944 if (!(edid_checksum(edid)))
947 if (!(edid_check_header(edid)))
950 memset(specs, 0, sizeof(struct fb_monspecs));
952 specs->version = edid[EDID_STRUCT_VERSION];
953 specs->revision = edid[EDID_STRUCT_REVISION];
955 DPRINTK("========================================\n");
956 DPRINTK("Display Information (EDID)\n");
957 DPRINTK("========================================\n");
958 DPRINTK(" EDID Version %d.%d\n", (int) specs->version,
959 (int) specs->revision);
961 parse_vendor_block(edid + ID_MANUFACTURER_NAME, specs);
963 block = edid + DETAILED_TIMING_DESCRIPTIONS_START;
964 for (i = 0; i < 4; i++, block += DETAILED_TIMING_DESCRIPTION_SIZE) {
965 if (edid_is_serial_block(block)) {
966 copy_string(block, specs->serial_no);
967 DPRINTK(" Serial Number: %s\n", specs->serial_no);
968 } else if (edid_is_ascii_block(block)) {
969 copy_string(block, specs->ascii);
970 DPRINTK(" ASCII Block: %s\n", specs->ascii);
971 } else if (edid_is_monitor_block(block)) {
972 copy_string(block, specs->monitor);
973 DPRINTK(" Monitor Name: %s\n", specs->monitor);
977 DPRINTK(" Display Characteristics:\n");
978 get_monspecs(edid, specs);
980 specs->modedb = fb_create_modedb(edid, &specs->modedb_len, specs);
983 * Workaround for buggy EDIDs that sets that the first
984 * detailed timing is preferred but has not detailed
987 for (i = 0; i < specs->modedb_len; i++) {
988 if (specs->modedb[i].flag & FB_MODE_IS_DETAILED) {
995 specs->misc &= ~FB_MISC_1ST_DETAIL;
997 DPRINTK("========================================\n");
1001 * VESA Generalized Timing Formula (GTF)
1005 #define V_FRONTPORCH 1
1007 #define H_SCALEFACTOR 20
1008 #define H_BLANKSCALE 128
1009 #define H_GRADIENT 600
1013 struct __fb_timings {
1026 * fb_get_vblank - get vertical blank time
1027 * @hfreq: horizontal freq
1030 * vblank = right_margin + vsync_len + left_margin
1032 * given: right_margin = 1 (V_FRONTPORCH)
1037 * left_margin = --------------- - vsync_len
1040 static u32 fb_get_vblank(u32 hfreq)
1044 vblank = (hfreq * FLYBACK)/1000;
1045 vblank = (vblank + 500)/1000;
1046 return (vblank + V_FRONTPORCH);
1050 * fb_get_hblank_by_freq - get horizontal blank time given hfreq
1051 * @hfreq: horizontal freq
1052 * @xres: horizontal resolution in pixels
1057 * hblank = ------------------
1060 * duty cycle = percent of htotal assigned to inactive display
1061 * duty cycle = C - (M/Hfreq)
1063 * where: C = ((offset - scale factor) * blank_scale)
1064 * -------------------------------------- + scale factor
1066 * M = blank_scale * gradient
1069 static u32 fb_get_hblank_by_hfreq(u32 hfreq, u32 xres)
1071 u32 c_val, m_val, duty_cycle, hblank;
1073 c_val = (((H_OFFSET - H_SCALEFACTOR) * H_BLANKSCALE)/256 +
1074 H_SCALEFACTOR) * 1000;
1075 m_val = (H_BLANKSCALE * H_GRADIENT)/256;
1076 m_val = (m_val * 1000000)/hfreq;
1077 duty_cycle = c_val - m_val;
1078 hblank = (xres * duty_cycle)/(100000 - duty_cycle);
1083 * fb_get_hblank_by_dclk - get horizontal blank time given pixelclock
1084 * @dclk: pixelclock in Hz
1085 * @xres: horizontal resolution in pixels
1090 * hblank = ------------------
1093 * duty cycle = percent of htotal assigned to inactive display
1094 * duty cycle = C - (M * h_period)
1096 * where: h_period = SQRT(100 - C + (0.4 * xres * M)/dclk) + C - 100
1097 * -----------------------------------------------
1103 static u32 fb_get_hblank_by_dclk(u32 dclk, u32 xres)
1105 u32 duty_cycle, h_period, hblank;
1108 h_period = 100 - C_VAL;
1109 h_period *= h_period;
1110 h_period += (M_VAL * xres * 2 * 1000)/(5 * dclk);
1113 h_period = int_sqrt(h_period);
1114 h_period -= (100 - C_VAL) * 100;
1116 h_period /= 2 * M_VAL;
1118 duty_cycle = C_VAL * 1000 - (M_VAL * h_period)/100;
1119 hblank = (xres * duty_cycle)/(100000 - duty_cycle) + 8;
1125 * fb_get_hfreq - estimate hsync
1126 * @vfreq: vertical refresh rate
1127 * @yres: vertical resolution
1131 * (yres + front_port) * vfreq * 1000000
1132 * hfreq = -------------------------------------
1133 * (1000000 - (vfreq * FLYBACK)
1137 static u32 fb_get_hfreq(u32 vfreq, u32 yres)
1141 divisor = (1000000 - (vfreq * FLYBACK))/1000;
1142 hfreq = (yres + V_FRONTPORCH) * vfreq * 1000;
1143 return (hfreq/divisor);
1146 static void fb_timings_vfreq(struct __fb_timings *timings)
1148 timings->hfreq = fb_get_hfreq(timings->vfreq, timings->vactive);
1149 timings->vblank = fb_get_vblank(timings->hfreq);
1150 timings->vtotal = timings->vactive + timings->vblank;
1151 timings->hblank = fb_get_hblank_by_hfreq(timings->hfreq,
1153 timings->htotal = timings->hactive + timings->hblank;
1154 timings->dclk = timings->htotal * timings->hfreq;
1157 static void fb_timings_hfreq(struct __fb_timings *timings)
1159 timings->vblank = fb_get_vblank(timings->hfreq);
1160 timings->vtotal = timings->vactive + timings->vblank;
1161 timings->vfreq = timings->hfreq/timings->vtotal;
1162 timings->hblank = fb_get_hblank_by_hfreq(timings->hfreq,
1164 timings->htotal = timings->hactive + timings->hblank;
1165 timings->dclk = timings->htotal * timings->hfreq;
1168 static void fb_timings_dclk(struct __fb_timings *timings)
1170 timings->hblank = fb_get_hblank_by_dclk(timings->dclk,
1172 timings->htotal = timings->hactive + timings->hblank;
1173 timings->hfreq = timings->dclk/timings->htotal;
1174 timings->vblank = fb_get_vblank(timings->hfreq);
1175 timings->vtotal = timings->vactive + timings->vblank;
1176 timings->vfreq = timings->hfreq/timings->vtotal;
1180 * fb_get_mode - calculates video mode using VESA GTF
1181 * @flags: if: 0 - maximize vertical refresh rate
1182 * 1 - vrefresh-driven calculation;
1183 * 2 - hscan-driven calculation;
1184 * 3 - pixelclock-driven calculation;
1185 * @val: depending on @flags, ignored, vrefresh, hsync or pixelclock
1186 * @var: pointer to fb_var_screeninfo
1187 * @info: pointer to fb_info
1190 * Calculates video mode based on monitor specs using VESA GTF.
1191 * The GTF is best for VESA GTF compliant monitors but is
1192 * specifically formulated to work for older monitors as well.
1194 * If @flag==0, the function will attempt to maximize the
1195 * refresh rate. Otherwise, it will calculate timings based on
1196 * the flag and accompanying value.
1198 * If FB_IGNOREMON bit is set in @flags, monitor specs will be
1199 * ignored and @var will be filled with the calculated timings.
1201 * All calculations are based on the VESA GTF Spreadsheet
1202 * available at VESA's public ftp (http://www.vesa.org).
1205 * The timings generated by the GTF will be different from VESA
1206 * DMT. It might be a good idea to keep a table of standard
1207 * VESA modes as well. The GTF may also not work for some displays,
1208 * such as, and especially, analog TV.
1211 * A valid info->monspecs, otherwise 'safe numbers' will be used.
1213 int fb_get_mode(int flags, u32 val, struct fb_var_screeninfo *var, struct fb_info *info)
1215 struct __fb_timings *timings;
1216 u32 interlace = 1, dscan = 1;
1217 u32 hfmin, hfmax, vfmin, vfmax, dclkmin, dclkmax, err = 0;
1220 timings = kzalloc(sizeof(struct __fb_timings), GFP_KERNEL);
1226 * If monspecs are invalid, use values that are enough
1229 if (!info || !info->monspecs.hfmax || !info->monspecs.vfmax ||
1230 !info->monspecs.dclkmax ||
1231 info->monspecs.hfmax < info->monspecs.hfmin ||
1232 info->monspecs.vfmax < info->monspecs.vfmin ||
1233 info->monspecs.dclkmax < info->monspecs.dclkmin) {
1234 hfmin = 29000; hfmax = 30000;
1235 vfmin = 60; vfmax = 60;
1236 dclkmin = 0; dclkmax = 25000000;
1238 hfmin = info->monspecs.hfmin;
1239 hfmax = info->monspecs.hfmax;
1240 vfmin = info->monspecs.vfmin;
1241 vfmax = info->monspecs.vfmax;
1242 dclkmin = info->monspecs.dclkmin;
1243 dclkmax = info->monspecs.dclkmax;
1246 timings->hactive = var->xres;
1247 timings->vactive = var->yres;
1248 if (var->vmode & FB_VMODE_INTERLACED) {
1249 timings->vactive /= 2;
1252 if (var->vmode & FB_VMODE_DOUBLE) {
1253 timings->vactive *= 2;
1257 switch (flags & ~FB_IGNOREMON) {
1258 case FB_MAXTIMINGS: /* maximize refresh rate */
1259 timings->hfreq = hfmax;
1260 fb_timings_hfreq(timings);
1261 if (timings->vfreq > vfmax) {
1262 timings->vfreq = vfmax;
1263 fb_timings_vfreq(timings);
1265 if (timings->dclk > dclkmax) {
1266 timings->dclk = dclkmax;
1267 fb_timings_dclk(timings);
1270 case FB_VSYNCTIMINGS: /* vrefresh driven */
1271 timings->vfreq = val;
1272 fb_timings_vfreq(timings);
1274 case FB_HSYNCTIMINGS: /* hsync driven */
1275 timings->hfreq = val;
1276 fb_timings_hfreq(timings);
1278 case FB_DCLKTIMINGS: /* pixelclock driven */
1279 timings->dclk = PICOS2KHZ(val) * 1000;
1280 fb_timings_dclk(timings);
1287 if (err || (!(flags & FB_IGNOREMON) &&
1288 (timings->vfreq < vfmin || timings->vfreq > vfmax ||
1289 timings->hfreq < hfmin || timings->hfreq > hfmax ||
1290 timings->dclk < dclkmin || timings->dclk > dclkmax))) {
1293 var->pixclock = KHZ2PICOS(timings->dclk/1000);
1294 var->hsync_len = (timings->htotal * 8)/100;
1295 var->right_margin = (timings->hblank/2) - var->hsync_len;
1296 var->left_margin = timings->hblank - var->right_margin -
1298 var->vsync_len = (3 * interlace)/dscan;
1299 var->lower_margin = (1 * interlace)/dscan;
1300 var->upper_margin = (timings->vblank * interlace)/dscan -
1301 (var->vsync_len + var->lower_margin);
1308 #ifdef CONFIG_VIDEOMODE_HELPERS
1309 int fb_videomode_from_videomode(const struct videomode *vm,
1310 struct fb_videomode *fbmode)
1312 unsigned int htotal, vtotal;
1314 fbmode->xres = vm->hactive;
1315 fbmode->left_margin = vm->hback_porch;
1316 fbmode->right_margin = vm->hfront_porch;
1317 fbmode->hsync_len = vm->hsync_len;
1319 fbmode->yres = vm->vactive;
1320 fbmode->upper_margin = vm->vback_porch;
1321 fbmode->lower_margin = vm->vfront_porch;
1322 fbmode->vsync_len = vm->vsync_len;
1324 /* prevent division by zero in KHZ2PICOS macro */
1325 fbmode->pixclock = vm->pixelclock ?
1326 KHZ2PICOS(vm->pixelclock / 1000) : 0;
1330 if (vm->flags & DISPLAY_FLAGS_HSYNC_HIGH)
1331 fbmode->sync |= FB_SYNC_HOR_HIGH_ACT;
1332 if (vm->flags & DISPLAY_FLAGS_VSYNC_HIGH)
1333 fbmode->sync |= FB_SYNC_VERT_HIGH_ACT;
1334 if (vm->flags & DISPLAY_FLAGS_INTERLACED)
1335 fbmode->vmode |= FB_VMODE_INTERLACED;
1336 if (vm->flags & DISPLAY_FLAGS_DOUBLESCAN)
1337 fbmode->vmode |= FB_VMODE_DOUBLE;
1340 htotal = vm->hactive + vm->hfront_porch + vm->hback_porch +
1342 vtotal = vm->vactive + vm->vfront_porch + vm->vback_porch +
1344 /* prevent division by zero */
1345 if (htotal && vtotal) {
1346 fbmode->refresh = vm->pixelclock / (htotal * vtotal);
1347 /* a mode must have htotal and vtotal != 0 or it is invalid */
1349 fbmode->refresh = 0;
1355 EXPORT_SYMBOL_GPL(fb_videomode_from_videomode);
1358 static inline void dump_fb_videomode(const struct fb_videomode *m)
1360 pr_debug("fb_videomode = %ux%u@%uHz (%ukHz) %u %u %u %u %u %u %u %u %u\n",
1361 m->xres, m->yres, m->refresh, m->pixclock, m->left_margin,
1362 m->right_margin, m->upper_margin, m->lower_margin,
1363 m->hsync_len, m->vsync_len, m->sync, m->vmode, m->flag);
1367 * of_get_fb_videomode - get a fb_videomode from devicetree
1368 * @np: device_node with the timing specification
1369 * @fb: will be set to the return value
1370 * @index: index into the list of display timings in devicetree
1373 * This function is expensive and should only be used, if only one mode is to be
1374 * read from DT. To get multiple modes start with of_get_display_timings ond
1375 * work with that instead.
1377 int of_get_fb_videomode(struct device_node *np, struct fb_videomode *fb,
1380 struct videomode vm;
1383 ret = of_get_videomode(np, &vm, index);
1387 ret = fb_videomode_from_videomode(&vm, fb);
1391 pr_debug("%s: got %dx%d display mode from %s\n",
1392 of_node_full_name(np), vm.hactive, vm.vactive, np->name);
1393 dump_fb_videomode(fb);
1397 EXPORT_SYMBOL_GPL(of_get_fb_videomode);
1398 #endif /* CONFIG_OF */
1399 #endif /* CONFIG_VIDEOMODE_HELPERS */
1402 int fb_parse_edid(unsigned char *edid, struct fb_var_screeninfo *var)
1406 void fb_edid_to_monspecs(unsigned char *edid, struct fb_monspecs *specs)
1409 void fb_destroy_modedb(struct fb_videomode *modedb)
1412 int fb_get_mode(int flags, u32 val, struct fb_var_screeninfo *var,
1413 struct fb_info *info)
1417 #endif /* CONFIG_FB_MODE_HELPERS */
1420 * fb_validate_mode - validates var against monitor capabilities
1421 * @var: pointer to fb_var_screeninfo
1422 * @info: pointer to fb_info
1425 * Validates video mode against monitor capabilities specified in
1429 * A valid info->monspecs.
1431 int fb_validate_mode(const struct fb_var_screeninfo *var, struct fb_info *info)
1433 u32 hfreq, vfreq, htotal, vtotal, pixclock;
1434 u32 hfmin, hfmax, vfmin, vfmax, dclkmin, dclkmax;
1437 * If monspecs are invalid, use values that are enough
1440 if (!info->monspecs.hfmax || !info->monspecs.vfmax ||
1441 !info->monspecs.dclkmax ||
1442 info->monspecs.hfmax < info->monspecs.hfmin ||
1443 info->monspecs.vfmax < info->monspecs.vfmin ||
1444 info->monspecs.dclkmax < info->monspecs.dclkmin) {
1445 hfmin = 29000; hfmax = 30000;
1446 vfmin = 60; vfmax = 60;
1447 dclkmin = 0; dclkmax = 25000000;
1449 hfmin = info->monspecs.hfmin;
1450 hfmax = info->monspecs.hfmax;
1451 vfmin = info->monspecs.vfmin;
1452 vfmax = info->monspecs.vfmax;
1453 dclkmin = info->monspecs.dclkmin;
1454 dclkmax = info->monspecs.dclkmax;
1459 pixclock = PICOS2KHZ(var->pixclock) * 1000;
1461 htotal = var->xres + var->right_margin + var->hsync_len +
1463 vtotal = var->yres + var->lower_margin + var->vsync_len +
1466 if (var->vmode & FB_VMODE_INTERLACED)
1468 if (var->vmode & FB_VMODE_DOUBLE)
1471 hfreq = pixclock/htotal;
1472 hfreq = (hfreq + 500) / 1000 * 1000;
1474 vfreq = hfreq/vtotal;
1476 return (vfreq < vfmin || vfreq > vfmax ||
1477 hfreq < hfmin || hfreq > hfmax ||
1478 pixclock < dclkmin || pixclock > dclkmax) ?
1482 #if defined(CONFIG_FIRMWARE_EDID) && defined(CONFIG_X86)
1485 * We need to ensure that the EDID block is only returned for
1486 * the primary graphics adapter.
1489 const unsigned char *fb_firmware_edid(struct device *device)
1491 struct pci_dev *dev = NULL;
1492 struct resource *res = NULL;
1493 unsigned char *edid = NULL;
1496 dev = to_pci_dev(device);
1499 res = &dev->resource[PCI_ROM_RESOURCE];
1501 if (res && res->flags & IORESOURCE_ROM_SHADOW)
1502 edid = edid_info.dummy;
1507 const unsigned char *fb_firmware_edid(struct device *device)
1512 EXPORT_SYMBOL(fb_firmware_edid);
1514 EXPORT_SYMBOL(fb_parse_edid);
1515 EXPORT_SYMBOL(fb_edid_to_monspecs);
1516 EXPORT_SYMBOL(fb_get_mode);
1517 EXPORT_SYMBOL(fb_validate_mode);
1518 EXPORT_SYMBOL(fb_destroy_modedb);