Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * linux/drivers/video/fbmon.c | |
3 | * | |
4 | * Copyright (C) 2002 James Simmons <jsimmons@users.sf.net> | |
5 | * | |
6 | * Credits: | |
8c85fd89 | 7 | * |
1da177e4 LT |
8 | * The EDID Parser is a conglomeration from the following sources: |
9 | * | |
10 | * 1. SciTech SNAP Graphics Architecture | |
11 | * Copyright (C) 1991-2002 SciTech Software, Inc. All rights reserved. | |
12 | * | |
13 | * 2. XFree86 4.3.0, interpret_edid.c | |
14 | * Copyright 1998 by Egbert Eich <Egbert.Eich@Physik.TU-Darmstadt.DE> | |
8c85fd89 AH |
15 | * |
16 | * 3. John Fremlin <vii@users.sourceforge.net> and | |
1da177e4 | 17 | * Ani Joshi <ajoshi@unixbox.com> |
8c85fd89 | 18 | * |
1da177e4 LT |
19 | * Generalized Timing Formula is derived from: |
20 | * | |
8c85fd89 | 21 | * GTF Spreadsheet by Andy Morrish (1/5/97) |
1da177e4 LT |
22 | * available at http://www.vesa.org |
23 | * | |
24 | * This file is subject to the terms and conditions of the GNU General Public | |
25 | * License. See the file COPYING in the main directory of this archive | |
26 | * for more details. | |
27 | * | |
28 | */ | |
1da177e4 LT |
29 | #include <linux/fb.h> |
30 | #include <linux/module.h> | |
22f4a00f | 31 | #include <linux/pci.h> |
5e518d76 | 32 | #include <video/edid.h> |
1da177e4 | 33 | #ifdef CONFIG_PPC_OF |
1da177e4 LT |
34 | #include <asm/prom.h> |
35 | #include <asm/pci-bridge.h> | |
36 | #endif | |
1da177e4 LT |
37 | #include "edid.h" |
38 | ||
8c85fd89 | 39 | /* |
1da177e4 LT |
40 | * EDID parser |
41 | */ | |
42 | ||
43 | #undef DEBUG /* define this for verbose EDID parsing output */ | |
44 | ||
45 | #ifdef DEBUG | |
46 | #define DPRINTK(fmt, args...) printk(fmt,## args) | |
47 | #else | |
48 | #define DPRINTK(fmt, args...) | |
49 | #endif | |
50 | ||
33a9f640 AD |
51 | #define FBMON_FIX_HEADER 1 |
52 | #define FBMON_FIX_INPUT 2 | |
53 | #define FBMON_FIX_TIMINGS 3 | |
1da177e4 LT |
54 | |
55 | #ifdef CONFIG_FB_MODE_HELPERS | |
56 | struct broken_edid { | |
57 | u8 manufacturer[4]; | |
58 | u32 model; | |
59 | u32 fix; | |
60 | }; | |
61 | ||
d95159cf | 62 | static const struct broken_edid brokendb[] = { |
1da177e4 LT |
63 | /* DEC FR-PCXAV-YZ */ |
64 | { | |
65 | .manufacturer = "DEC", | |
66 | .model = 0x073a, | |
67 | .fix = FBMON_FIX_HEADER, | |
68 | }, | |
69 | /* ViewSonic PF775a */ | |
70 | { | |
71 | .manufacturer = "VSC", | |
72 | .model = 0x5a44, | |
73 | .fix = FBMON_FIX_INPUT, | |
74 | }, | |
33a9f640 AD |
75 | /* Sharp UXGA? */ |
76 | { | |
77 | .manufacturer = "SHP", | |
78 | .model = 0x138e, | |
79 | .fix = FBMON_FIX_TIMINGS, | |
80 | }, | |
1da177e4 LT |
81 | }; |
82 | ||
83 | static const unsigned char edid_v1_header[] = { 0x00, 0xff, 0xff, 0xff, | |
84 | 0xff, 0xff, 0xff, 0x00 | |
85 | }; | |
86 | ||
87 | static void copy_string(unsigned char *c, unsigned char *s) | |
88 | { | |
89 | int i; | |
90 | c = c + 5; | |
91 | for (i = 0; (i < 13 && *c != 0x0A); i++) | |
92 | *(s++) = *(c++); | |
93 | *s = 0; | |
94 | while (i-- && (*--s == 0x20)) *s = 0; | |
95 | } | |
96 | ||
33a9f640 AD |
97 | static int edid_is_serial_block(unsigned char *block) |
98 | { | |
99 | if ((block[0] == 0x00) && (block[1] == 0x00) && | |
100 | (block[2] == 0x00) && (block[3] == 0xff) && | |
101 | (block[4] == 0x00)) | |
102 | return 1; | |
103 | else | |
104 | return 0; | |
105 | } | |
106 | ||
107 | static int edid_is_ascii_block(unsigned char *block) | |
108 | { | |
109 | if ((block[0] == 0x00) && (block[1] == 0x00) && | |
110 | (block[2] == 0x00) && (block[3] == 0xfe) && | |
111 | (block[4] == 0x00)) | |
112 | return 1; | |
113 | else | |
114 | return 0; | |
115 | } | |
116 | ||
117 | static int edid_is_limits_block(unsigned char *block) | |
118 | { | |
119 | if ((block[0] == 0x00) && (block[1] == 0x00) && | |
120 | (block[2] == 0x00) && (block[3] == 0xfd) && | |
121 | (block[4] == 0x00)) | |
122 | return 1; | |
123 | else | |
124 | return 0; | |
125 | } | |
126 | ||
127 | static int edid_is_monitor_block(unsigned char *block) | |
128 | { | |
129 | if ((block[0] == 0x00) && (block[1] == 0x00) && | |
130 | (block[2] == 0x00) && (block[3] == 0xfc) && | |
131 | (block[4] == 0x00)) | |
132 | return 1; | |
133 | else | |
134 | return 0; | |
135 | } | |
136 | ||
137 | static int edid_is_timing_block(unsigned char *block) | |
138 | { | |
139 | if ((block[0] != 0x00) || (block[1] != 0x00) || | |
140 | (block[2] != 0x00) || (block[4] != 0x00)) | |
141 | return 1; | |
142 | else | |
143 | return 0; | |
144 | } | |
145 | ||
1da177e4 LT |
146 | static int check_edid(unsigned char *edid) |
147 | { | |
148 | unsigned char *block = edid + ID_MANUFACTURER_NAME, manufacturer[4]; | |
149 | unsigned char *b; | |
150 | u32 model; | |
151 | int i, fix = 0, ret = 0; | |
152 | ||
153 | manufacturer[0] = ((block[0] & 0x7c) >> 2) + '@'; | |
154 | manufacturer[1] = ((block[0] & 0x03) << 3) + | |
155 | ((block[1] & 0xe0) >> 5) + '@'; | |
156 | manufacturer[2] = (block[1] & 0x1f) + '@'; | |
157 | manufacturer[3] = 0; | |
158 | model = block[2] + (block[3] << 8); | |
159 | ||
160 | for (i = 0; i < ARRAY_SIZE(brokendb); i++) { | |
161 | if (!strncmp(manufacturer, brokendb[i].manufacturer, 4) && | |
162 | brokendb[i].model == model) { | |
8c85fd89 AH |
163 | fix = brokendb[i].fix; |
164 | break; | |
1da177e4 LT |
165 | } |
166 | } | |
167 | ||
168 | switch (fix) { | |
169 | case FBMON_FIX_HEADER: | |
170 | for (i = 0; i < 8; i++) { | |
33a9f640 | 171 | if (edid[i] != edid_v1_header[i]) { |
1da177e4 | 172 | ret = fix; |
33a9f640 AD |
173 | break; |
174 | } | |
1da177e4 LT |
175 | } |
176 | break; | |
177 | case FBMON_FIX_INPUT: | |
178 | b = edid + EDID_STRUCT_DISPLAY; | |
179 | /* Only if display is GTF capable will | |
180 | the input type be reset to analog */ | |
181 | if (b[4] & 0x01 && b[0] & 0x80) | |
182 | ret = fix; | |
183 | break; | |
33a9f640 AD |
184 | case FBMON_FIX_TIMINGS: |
185 | b = edid + DETAILED_TIMING_DESCRIPTIONS_START; | |
186 | ret = fix; | |
187 | ||
188 | for (i = 0; i < 4; i++) { | |
189 | if (edid_is_limits_block(b)) { | |
190 | ret = 0; | |
191 | break; | |
192 | } | |
193 | ||
194 | b += DETAILED_TIMING_DESCRIPTION_SIZE; | |
195 | } | |
196 | ||
197 | break; | |
1da177e4 LT |
198 | } |
199 | ||
33a9f640 AD |
200 | if (ret) |
201 | printk("fbmon: The EDID Block of " | |
202 | "Manufacturer: %s Model: 0x%x is known to " | |
203 | "be broken,\n", manufacturer, model); | |
204 | ||
1da177e4 LT |
205 | return ret; |
206 | } | |
207 | ||
208 | static void fix_edid(unsigned char *edid, int fix) | |
209 | { | |
33a9f640 AD |
210 | int i; |
211 | unsigned char *b, csum = 0; | |
1da177e4 LT |
212 | |
213 | switch (fix) { | |
214 | case FBMON_FIX_HEADER: | |
215 | printk("fbmon: trying a header reconstruct\n"); | |
216 | memcpy(edid, edid_v1_header, 8); | |
217 | break; | |
218 | case FBMON_FIX_INPUT: | |
219 | printk("fbmon: trying to fix input type\n"); | |
220 | b = edid + EDID_STRUCT_DISPLAY; | |
221 | b[0] &= ~0x80; | |
222 | edid[127] += 0x80; | |
33a9f640 AD |
223 | break; |
224 | case FBMON_FIX_TIMINGS: | |
225 | printk("fbmon: trying to fix monitor timings\n"); | |
226 | b = edid + DETAILED_TIMING_DESCRIPTIONS_START; | |
227 | for (i = 0; i < 4; i++) { | |
228 | if (!(edid_is_serial_block(b) || | |
229 | edid_is_ascii_block(b) || | |
230 | edid_is_monitor_block(b) || | |
231 | edid_is_timing_block(b))) { | |
232 | b[0] = 0x00; | |
233 | b[1] = 0x00; | |
234 | b[2] = 0x00; | |
235 | b[3] = 0xfd; | |
236 | b[4] = 0x00; | |
237 | b[5] = 60; /* vfmin */ | |
238 | b[6] = 60; /* vfmax */ | |
239 | b[7] = 30; /* hfmin */ | |
240 | b[8] = 75; /* hfmax */ | |
241 | b[9] = 17; /* pixclock - 170 MHz*/ | |
242 | b[10] = 0; /* GTF */ | |
243 | break; | |
244 | } | |
245 | ||
246 | b += DETAILED_TIMING_DESCRIPTION_SIZE; | |
247 | } | |
248 | ||
249 | for (i = 0; i < EDID_LENGTH - 1; i++) | |
250 | csum += edid[i]; | |
251 | ||
252 | edid[127] = 256 - csum; | |
253 | break; | |
1da177e4 LT |
254 | } |
255 | } | |
256 | ||
257 | static int edid_checksum(unsigned char *edid) | |
258 | { | |
259 | unsigned char i, csum = 0, all_null = 0; | |
260 | int err = 0, fix = check_edid(edid); | |
261 | ||
262 | if (fix) | |
263 | fix_edid(edid, fix); | |
264 | ||
265 | for (i = 0; i < EDID_LENGTH; i++) { | |
266 | csum += edid[i]; | |
267 | all_null |= edid[i]; | |
268 | } | |
269 | ||
270 | if (csum == 0x00 && all_null) { | |
271 | /* checksum passed, everything's good */ | |
272 | err = 1; | |
273 | } | |
274 | ||
275 | return err; | |
276 | } | |
277 | ||
278 | static int edid_check_header(unsigned char *edid) | |
279 | { | |
280 | int i, err = 1, fix = check_edid(edid); | |
281 | ||
282 | if (fix) | |
283 | fix_edid(edid, fix); | |
284 | ||
285 | for (i = 0; i < 8; i++) { | |
286 | if (edid[i] != edid_v1_header[i]) | |
287 | err = 0; | |
288 | } | |
289 | ||
290 | return err; | |
291 | } | |
292 | ||
293 | static void parse_vendor_block(unsigned char *block, struct fb_monspecs *specs) | |
294 | { | |
295 | specs->manufacturer[0] = ((block[0] & 0x7c) >> 2) + '@'; | |
296 | specs->manufacturer[1] = ((block[0] & 0x03) << 3) + | |
297 | ((block[1] & 0xe0) >> 5) + '@'; | |
298 | specs->manufacturer[2] = (block[1] & 0x1f) + '@'; | |
299 | specs->manufacturer[3] = 0; | |
300 | specs->model = block[2] + (block[3] << 8); | |
301 | specs->serial = block[4] + (block[5] << 8) + | |
302 | (block[6] << 16) + (block[7] << 24); | |
303 | specs->year = block[9] + 1990; | |
304 | specs->week = block[8]; | |
305 | DPRINTK(" Manufacturer: %s\n", specs->manufacturer); | |
306 | DPRINTK(" Model: %x\n", specs->model); | |
307 | DPRINTK(" Serial#: %u\n", specs->serial); | |
308 | DPRINTK(" Year: %u Week %u\n", specs->year, specs->week); | |
309 | } | |
310 | ||
311 | static void get_dpms_capabilities(unsigned char flags, | |
312 | struct fb_monspecs *specs) | |
313 | { | |
314 | specs->dpms = 0; | |
315 | if (flags & DPMS_ACTIVE_OFF) | |
316 | specs->dpms |= FB_DPMS_ACTIVE_OFF; | |
317 | if (flags & DPMS_SUSPEND) | |
318 | specs->dpms |= FB_DPMS_SUSPEND; | |
319 | if (flags & DPMS_STANDBY) | |
320 | specs->dpms |= FB_DPMS_STANDBY; | |
321 | DPRINTK(" DPMS: Active %s, Suspend %s, Standby %s\n", | |
322 | (flags & DPMS_ACTIVE_OFF) ? "yes" : "no", | |
323 | (flags & DPMS_SUSPEND) ? "yes" : "no", | |
324 | (flags & DPMS_STANDBY) ? "yes" : "no"); | |
325 | } | |
8c85fd89 | 326 | |
1da177e4 LT |
327 | static void get_chroma(unsigned char *block, struct fb_monspecs *specs) |
328 | { | |
329 | int tmp; | |
330 | ||
331 | DPRINTK(" Chroma\n"); | |
332 | /* Chromaticity data */ | |
333 | tmp = ((block[5] & (3 << 6)) >> 6) | (block[0x7] << 2); | |
334 | tmp *= 1000; | |
335 | tmp += 512; | |
336 | specs->chroma.redx = tmp/1024; | |
337 | DPRINTK(" RedX: 0.%03d ", specs->chroma.redx); | |
338 | ||
339 | tmp = ((block[5] & (3 << 4)) >> 4) | (block[0x8] << 2); | |
340 | tmp *= 1000; | |
341 | tmp += 512; | |
342 | specs->chroma.redy = tmp/1024; | |
343 | DPRINTK("RedY: 0.%03d\n", specs->chroma.redy); | |
344 | ||
345 | tmp = ((block[5] & (3 << 2)) >> 2) | (block[0x9] << 2); | |
346 | tmp *= 1000; | |
347 | tmp += 512; | |
348 | specs->chroma.greenx = tmp/1024; | |
349 | DPRINTK(" GreenX: 0.%03d ", specs->chroma.greenx); | |
350 | ||
351 | tmp = (block[5] & 3) | (block[0xa] << 2); | |
352 | tmp *= 1000; | |
353 | tmp += 512; | |
354 | specs->chroma.greeny = tmp/1024; | |
355 | DPRINTK("GreenY: 0.%03d\n", specs->chroma.greeny); | |
356 | ||
357 | tmp = ((block[6] & (3 << 6)) >> 6) | (block[0xb] << 2); | |
358 | tmp *= 1000; | |
359 | tmp += 512; | |
360 | specs->chroma.bluex = tmp/1024; | |
361 | DPRINTK(" BlueX: 0.%03d ", specs->chroma.bluex); | |
362 | ||
363 | tmp = ((block[6] & (3 << 4)) >> 4) | (block[0xc] << 2); | |
364 | tmp *= 1000; | |
365 | tmp += 512; | |
366 | specs->chroma.bluey = tmp/1024; | |
367 | DPRINTK("BlueY: 0.%03d\n", specs->chroma.bluey); | |
8c85fd89 | 368 | |
1da177e4 LT |
369 | tmp = ((block[6] & (3 << 2)) >> 2) | (block[0xd] << 2); |
370 | tmp *= 1000; | |
371 | tmp += 512; | |
372 | specs->chroma.whitex = tmp/1024; | |
373 | DPRINTK(" WhiteX: 0.%03d ", specs->chroma.whitex); | |
374 | ||
375 | tmp = (block[6] & 3) | (block[0xe] << 2); | |
376 | tmp *= 1000; | |
377 | tmp += 512; | |
378 | specs->chroma.whitey = tmp/1024; | |
379 | DPRINTK("WhiteY: 0.%03d\n", specs->chroma.whitey); | |
380 | } | |
381 | ||
61ab7903 AD |
382 | static void calc_mode_timings(int xres, int yres, int refresh, |
383 | struct fb_videomode *mode) | |
1da177e4 | 384 | { |
af5d0f7e | 385 | struct fb_var_screeninfo *var; |
8c85fd89 | 386 | |
af5d0f7e AD |
387 | var = kzalloc(sizeof(struct fb_var_screeninfo), GFP_KERNEL); |
388 | ||
389 | if (var) { | |
390 | var->xres = xres; | |
391 | var->yres = yres; | |
392 | fb_get_mode(FB_VSYNCTIMINGS | FB_IGNOREMON, | |
393 | refresh, var, NULL); | |
394 | mode->xres = xres; | |
395 | mode->yres = yres; | |
396 | mode->pixclock = var->pixclock; | |
397 | mode->refresh = refresh; | |
398 | mode->left_margin = var->left_margin; | |
399 | mode->right_margin = var->right_margin; | |
400 | mode->upper_margin = var->upper_margin; | |
401 | mode->lower_margin = var->lower_margin; | |
402 | mode->hsync_len = var->hsync_len; | |
403 | mode->vsync_len = var->vsync_len; | |
404 | mode->vmode = 0; | |
405 | mode->sync = 0; | |
406 | kfree(var); | |
407 | } | |
1da177e4 LT |
408 | } |
409 | ||
410 | static int get_est_timing(unsigned char *block, struct fb_videomode *mode) | |
411 | { | |
412 | int num = 0; | |
413 | unsigned char c; | |
414 | ||
415 | c = block[0]; | |
416 | if (c&0x80) { | |
417 | calc_mode_timings(720, 400, 70, &mode[num]); | |
418 | mode[num++].flag = FB_MODE_IS_CALCULATED; | |
419 | DPRINTK(" 720x400@70Hz\n"); | |
420 | } | |
421 | if (c&0x40) { | |
422 | calc_mode_timings(720, 400, 88, &mode[num]); | |
423 | mode[num++].flag = FB_MODE_IS_CALCULATED; | |
424 | DPRINTK(" 720x400@88Hz\n"); | |
425 | } | |
426 | if (c&0x20) { | |
427 | mode[num++] = vesa_modes[3]; | |
428 | DPRINTK(" 640x480@60Hz\n"); | |
429 | } | |
430 | if (c&0x10) { | |
431 | calc_mode_timings(640, 480, 67, &mode[num]); | |
432 | mode[num++].flag = FB_MODE_IS_CALCULATED; | |
433 | DPRINTK(" 640x480@67Hz\n"); | |
434 | } | |
435 | if (c&0x08) { | |
436 | mode[num++] = vesa_modes[4]; | |
437 | DPRINTK(" 640x480@72Hz\n"); | |
438 | } | |
439 | if (c&0x04) { | |
440 | mode[num++] = vesa_modes[5]; | |
441 | DPRINTK(" 640x480@75Hz\n"); | |
442 | } | |
443 | if (c&0x02) { | |
444 | mode[num++] = vesa_modes[7]; | |
445 | DPRINTK(" 800x600@56Hz\n"); | |
446 | } | |
447 | if (c&0x01) { | |
448 | mode[num++] = vesa_modes[8]; | |
449 | DPRINTK(" 800x600@60Hz\n"); | |
450 | } | |
451 | ||
452 | c = block[1]; | |
453 | if (c&0x80) { | |
8c85fd89 | 454 | mode[num++] = vesa_modes[9]; |
1da177e4 LT |
455 | DPRINTK(" 800x600@72Hz\n"); |
456 | } | |
457 | if (c&0x40) { | |
8c85fd89 | 458 | mode[num++] = vesa_modes[10]; |
1da177e4 LT |
459 | DPRINTK(" 800x600@75Hz\n"); |
460 | } | |
461 | if (c&0x20) { | |
462 | calc_mode_timings(832, 624, 75, &mode[num]); | |
463 | mode[num++].flag = FB_MODE_IS_CALCULATED; | |
464 | DPRINTK(" 832x624@75Hz\n"); | |
465 | } | |
466 | if (c&0x10) { | |
467 | mode[num++] = vesa_modes[12]; | |
468 | DPRINTK(" 1024x768@87Hz Interlaced\n"); | |
469 | } | |
470 | if (c&0x08) { | |
471 | mode[num++] = vesa_modes[13]; | |
472 | DPRINTK(" 1024x768@60Hz\n"); | |
473 | } | |
474 | if (c&0x04) { | |
475 | mode[num++] = vesa_modes[14]; | |
476 | DPRINTK(" 1024x768@70Hz\n"); | |
477 | } | |
478 | if (c&0x02) { | |
479 | mode[num++] = vesa_modes[15]; | |
480 | DPRINTK(" 1024x768@75Hz\n"); | |
481 | } | |
482 | if (c&0x01) { | |
483 | mode[num++] = vesa_modes[21]; | |
484 | DPRINTK(" 1280x1024@75Hz\n"); | |
485 | } | |
486 | c = block[2]; | |
487 | if (c&0x80) { | |
488 | mode[num++] = vesa_modes[17]; | |
489 | DPRINTK(" 1152x870@75Hz\n"); | |
490 | } | |
491 | DPRINTK(" Manufacturer's mask: %x\n",c&0x7F); | |
492 | return num; | |
493 | } | |
494 | ||
495 | static int get_std_timing(unsigned char *block, struct fb_videomode *mode) | |
496 | { | |
497 | int xres, yres = 0, refresh, ratio, i; | |
8c85fd89 | 498 | |
1da177e4 LT |
499 | xres = (block[0] + 31) * 8; |
500 | if (xres <= 256) | |
501 | return 0; | |
502 | ||
503 | ratio = (block[1] & 0xc0) >> 6; | |
504 | switch (ratio) { | |
505 | case 0: | |
506 | yres = xres; | |
507 | break; | |
508 | case 1: | |
509 | yres = (xres * 3)/4; | |
510 | break; | |
511 | case 2: | |
512 | yres = (xres * 4)/5; | |
513 | break; | |
514 | case 3: | |
515 | yres = (xres * 9)/16; | |
516 | break; | |
517 | } | |
518 | refresh = (block[1] & 0x3f) + 60; | |
519 | ||
520 | DPRINTK(" %dx%d@%dHz\n", xres, yres, refresh); | |
521 | for (i = 0; i < VESA_MODEDB_SIZE; i++) { | |
8c85fd89 | 522 | if (vesa_modes[i].xres == xres && |
1da177e4 LT |
523 | vesa_modes[i].yres == yres && |
524 | vesa_modes[i].refresh == refresh) { | |
525 | *mode = vesa_modes[i]; | |
526 | mode->flag |= FB_MODE_IS_STANDARD; | |
527 | return 1; | |
528 | } | |
529 | } | |
530 | calc_mode_timings(xres, yres, refresh, mode); | |
531 | return 1; | |
532 | } | |
533 | ||
534 | static int get_dst_timing(unsigned char *block, | |
535 | struct fb_videomode *mode) | |
536 | { | |
537 | int j, num = 0; | |
538 | ||
8c85fd89 | 539 | for (j = 0; j < 6; j++, block += STD_TIMING_DESCRIPTION_SIZE) |
1da177e4 LT |
540 | num += get_std_timing(block, &mode[num]); |
541 | ||
542 | return num; | |
543 | } | |
544 | ||
8c85fd89 | 545 | static void get_detailed_timing(unsigned char *block, |
1da177e4 LT |
546 | struct fb_videomode *mode) |
547 | { | |
548 | mode->xres = H_ACTIVE; | |
549 | mode->yres = V_ACTIVE; | |
550 | mode->pixclock = PIXEL_CLOCK; | |
551 | mode->pixclock /= 1000; | |
552 | mode->pixclock = KHZ2PICOS(mode->pixclock); | |
553 | mode->right_margin = H_SYNC_OFFSET; | |
554 | mode->left_margin = (H_ACTIVE + H_BLANKING) - | |
555 | (H_ACTIVE + H_SYNC_OFFSET + H_SYNC_WIDTH); | |
8c85fd89 | 556 | mode->upper_margin = V_BLANKING - V_SYNC_OFFSET - |
1da177e4 LT |
557 | V_SYNC_WIDTH; |
558 | mode->lower_margin = V_SYNC_OFFSET; | |
559 | mode->hsync_len = H_SYNC_WIDTH; | |
560 | mode->vsync_len = V_SYNC_WIDTH; | |
561 | if (HSYNC_POSITIVE) | |
562 | mode->sync |= FB_SYNC_HOR_HIGH_ACT; | |
563 | if (VSYNC_POSITIVE) | |
564 | mode->sync |= FB_SYNC_VERT_HIGH_ACT; | |
565 | mode->refresh = PIXEL_CLOCK/((H_ACTIVE + H_BLANKING) * | |
566 | (V_ACTIVE + V_BLANKING)); | |
567 | mode->vmode = 0; | |
568 | mode->flag = FB_MODE_IS_DETAILED; | |
569 | ||
570 | DPRINTK(" %d MHz ", PIXEL_CLOCK/1000000); | |
571 | DPRINTK("%d %d %d %d ", H_ACTIVE, H_ACTIVE + H_SYNC_OFFSET, | |
572 | H_ACTIVE + H_SYNC_OFFSET + H_SYNC_WIDTH, H_ACTIVE + H_BLANKING); | |
573 | DPRINTK("%d %d %d %d ", V_ACTIVE, V_ACTIVE + V_SYNC_OFFSET, | |
574 | V_ACTIVE + V_SYNC_OFFSET + V_SYNC_WIDTH, V_ACTIVE + V_BLANKING); | |
575 | DPRINTK("%sHSync %sVSync\n\n", (HSYNC_POSITIVE) ? "+" : "-", | |
576 | (VSYNC_POSITIVE) ? "+" : "-"); | |
577 | } | |
578 | ||
579 | /** | |
580 | * fb_create_modedb - create video mode database | |
581 | * @edid: EDID data | |
582 | * @dbsize: database size | |
583 | * | |
584 | * RETURNS: struct fb_videomode, @dbsize contains length of database | |
585 | * | |
586 | * DESCRIPTION: | |
587 | * This function builds a mode database using the contents of the EDID | |
588 | * data | |
589 | */ | |
590 | static struct fb_videomode *fb_create_modedb(unsigned char *edid, int *dbsize) | |
591 | { | |
592 | struct fb_videomode *mode, *m; | |
593 | unsigned char *block; | |
5a258d03 | 594 | int num = 0, i, first = 1; |
1da177e4 | 595 | |
def1eded | 596 | mode = kzalloc(50 * sizeof(struct fb_videomode), GFP_KERNEL); |
1da177e4 LT |
597 | if (mode == NULL) |
598 | return NULL; | |
1da177e4 | 599 | |
8c85fd89 | 600 | if (edid == NULL || !edid_checksum(edid) || |
1da177e4 LT |
601 | !edid_check_header(edid)) { |
602 | kfree(mode); | |
603 | return NULL; | |
604 | } | |
605 | ||
606 | *dbsize = 0; | |
607 | ||
1da177e4 LT |
608 | DPRINTK(" Detailed Timings\n"); |
609 | block = edid + DETAILED_TIMING_DESCRIPTIONS_START; | |
610 | for (i = 0; i < 4; i++, block+= DETAILED_TIMING_DESCRIPTION_SIZE) { | |
14c8102f | 611 | if (!(block[0] == 0x00 && block[1] == 0x00)) { |
1da177e4 LT |
612 | get_detailed_timing(block, &mode[num]); |
613 | if (first) { | |
614 | mode[num].flag |= FB_MODE_IS_FIRST; | |
615 | first = 0; | |
616 | } | |
617 | num++; | |
618 | } | |
619 | } | |
14c8102f AD |
620 | |
621 | DPRINTK(" Supported VESA Modes\n"); | |
622 | block = edid + ESTABLISHED_TIMING_1; | |
623 | num += get_est_timing(block, &mode[num]); | |
624 | ||
625 | DPRINTK(" Standard Timings\n"); | |
626 | block = edid + STD_TIMING_DESCRIPTIONS_START; | |
627 | for (i = 0; i < STD_TIMING; i++, block += STD_TIMING_DESCRIPTION_SIZE) | |
628 | num += get_std_timing(block, &mode[num]); | |
629 | ||
630 | block = edid + DETAILED_TIMING_DESCRIPTIONS_START; | |
631 | for (i = 0; i < 4; i++, block+= DETAILED_TIMING_DESCRIPTION_SIZE) { | |
632 | if (block[0] == 0x00 && block[1] == 0x00 && block[3] == 0xfa) | |
633 | num += get_dst_timing(block + 5, &mode[num]); | |
634 | } | |
8c85fd89 | 635 | |
1da177e4 LT |
636 | /* Yikes, EDID data is totally useless */ |
637 | if (!num) { | |
638 | kfree(mode); | |
639 | return NULL; | |
640 | } | |
641 | ||
642 | *dbsize = num; | |
643 | m = kmalloc(num * sizeof(struct fb_videomode), GFP_KERNEL); | |
644 | if (!m) | |
645 | return mode; | |
646 | memmove(m, mode, num * sizeof(struct fb_videomode)); | |
647 | kfree(mode); | |
648 | return m; | |
649 | } | |
650 | ||
651 | /** | |
652 | * fb_destroy_modedb - destroys mode database | |
653 | * @modedb: mode database to destroy | |
654 | * | |
655 | * DESCRIPTION: | |
656 | * Destroy mode database created by fb_create_modedb | |
657 | */ | |
658 | void fb_destroy_modedb(struct fb_videomode *modedb) | |
659 | { | |
660 | kfree(modedb); | |
661 | } | |
662 | ||
663 | static int fb_get_monitor_limits(unsigned char *edid, struct fb_monspecs *specs) | |
664 | { | |
665 | int i, retval = 1; | |
666 | unsigned char *block; | |
667 | ||
668 | block = edid + DETAILED_TIMING_DESCRIPTIONS_START; | |
669 | ||
670 | DPRINTK(" Monitor Operating Limits: "); | |
30076831 | 671 | |
1da177e4 LT |
672 | for (i = 0; i < 4; i++, block += DETAILED_TIMING_DESCRIPTION_SIZE) { |
673 | if (edid_is_limits_block(block)) { | |
674 | specs->hfmin = H_MIN_RATE * 1000; | |
675 | specs->hfmax = H_MAX_RATE * 1000; | |
676 | specs->vfmin = V_MIN_RATE; | |
677 | specs->vfmax = V_MAX_RATE; | |
678 | specs->dclkmax = MAX_PIXEL_CLOCK * 1000000; | |
679 | specs->gtf = (GTF_SUPPORT) ? 1 : 0; | |
680 | retval = 0; | |
681 | DPRINTK("From EDID\n"); | |
682 | break; | |
683 | } | |
684 | } | |
30076831 | 685 | |
1da177e4 LT |
686 | /* estimate monitor limits based on modes supported */ |
687 | if (retval) { | |
30076831 | 688 | struct fb_videomode *modes, *mode; |
cb85063a | 689 | int num_modes, hz, hscan, pixclock; |
30076831 | 690 | int vtotal, htotal; |
1da177e4 LT |
691 | |
692 | modes = fb_create_modedb(edid, &num_modes); | |
693 | if (!modes) { | |
694 | DPRINTK("None Available\n"); | |
695 | return 1; | |
696 | } | |
697 | ||
698 | retval = 0; | |
699 | for (i = 0; i < num_modes; i++) { | |
30076831 | 700 | mode = &modes[i]; |
1da177e4 | 701 | pixclock = PICOS2KHZ(modes[i].pixclock) * 1000; |
30076831 AD |
702 | htotal = mode->xres + mode->right_margin + mode->hsync_len |
703 | + mode->left_margin; | |
704 | vtotal = mode->yres + mode->lower_margin + mode->vsync_len | |
705 | + mode->upper_margin; | |
706 | ||
707 | if (mode->vmode & FB_VMODE_INTERLACED) | |
708 | vtotal /= 2; | |
709 | ||
710 | if (mode->vmode & FB_VMODE_DOUBLE) | |
711 | vtotal *= 2; | |
712 | ||
713 | hscan = (pixclock + htotal / 2) / htotal; | |
714 | hscan = (hscan + 500) / 1000 * 1000; | |
715 | hz = (hscan + vtotal / 2) / vtotal; | |
8c85fd89 | 716 | |
1da177e4 LT |
717 | if (specs->dclkmax == 0 || specs->dclkmax < pixclock) |
718 | specs->dclkmax = pixclock; | |
30076831 | 719 | |
1da177e4 LT |
720 | if (specs->dclkmin == 0 || specs->dclkmin > pixclock) |
721 | specs->dclkmin = pixclock; | |
30076831 | 722 | |
1da177e4 LT |
723 | if (specs->hfmax == 0 || specs->hfmax < hscan) |
724 | specs->hfmax = hscan; | |
30076831 | 725 | |
1da177e4 LT |
726 | if (specs->hfmin == 0 || specs->hfmin > hscan) |
727 | specs->hfmin = hscan; | |
30076831 | 728 | |
1da177e4 LT |
729 | if (specs->vfmax == 0 || specs->vfmax < hz) |
730 | specs->vfmax = hz; | |
30076831 | 731 | |
1da177e4 LT |
732 | if (specs->vfmin == 0 || specs->vfmin > hz) |
733 | specs->vfmin = hz; | |
734 | } | |
735 | DPRINTK("Extrapolated\n"); | |
736 | fb_destroy_modedb(modes); | |
737 | } | |
738 | DPRINTK(" H: %d-%dKHz V: %d-%dHz DCLK: %dMHz\n", | |
739 | specs->hfmin/1000, specs->hfmax/1000, specs->vfmin, | |
740 | specs->vfmax, specs->dclkmax/1000000); | |
741 | return retval; | |
742 | } | |
743 | ||
744 | static void get_monspecs(unsigned char *edid, struct fb_monspecs *specs) | |
745 | { | |
746 | unsigned char c, *block; | |
747 | ||
748 | block = edid + EDID_STRUCT_DISPLAY; | |
749 | ||
750 | fb_get_monitor_limits(edid, specs); | |
751 | ||
752 | c = block[0] & 0x80; | |
753 | specs->input = 0; | |
754 | if (c) { | |
755 | specs->input |= FB_DISP_DDI; | |
756 | DPRINTK(" Digital Display Input"); | |
757 | } else { | |
758 | DPRINTK(" Analog Display Input: Input Voltage - "); | |
759 | switch ((block[0] & 0x60) >> 5) { | |
760 | case 0: | |
761 | DPRINTK("0.700V/0.300V"); | |
762 | specs->input |= FB_DISP_ANA_700_300; | |
763 | break; | |
764 | case 1: | |
765 | DPRINTK("0.714V/0.286V"); | |
766 | specs->input |= FB_DISP_ANA_714_286; | |
767 | break; | |
768 | case 2: | |
769 | DPRINTK("1.000V/0.400V"); | |
770 | specs->input |= FB_DISP_ANA_1000_400; | |
771 | break; | |
772 | case 3: | |
773 | DPRINTK("0.700V/0.000V"); | |
774 | specs->input |= FB_DISP_ANA_700_000; | |
775 | break; | |
776 | } | |
777 | } | |
778 | DPRINTK("\n Sync: "); | |
779 | c = block[0] & 0x10; | |
780 | if (c) | |
781 | DPRINTK(" Configurable signal level\n"); | |
782 | c = block[0] & 0x0f; | |
783 | specs->signal = 0; | |
784 | if (c & 0x10) { | |
785 | DPRINTK("Blank to Blank "); | |
786 | specs->signal |= FB_SIGNAL_BLANK_BLANK; | |
787 | } | |
788 | if (c & 0x08) { | |
789 | DPRINTK("Separate "); | |
790 | specs->signal |= FB_SIGNAL_SEPARATE; | |
791 | } | |
792 | if (c & 0x04) { | |
793 | DPRINTK("Composite "); | |
794 | specs->signal |= FB_SIGNAL_COMPOSITE; | |
795 | } | |
796 | if (c & 0x02) { | |
797 | DPRINTK("Sync on Green "); | |
798 | specs->signal |= FB_SIGNAL_SYNC_ON_GREEN; | |
799 | } | |
800 | if (c & 0x01) { | |
801 | DPRINTK("Serration on "); | |
802 | specs->signal |= FB_SIGNAL_SERRATION_ON; | |
803 | } | |
804 | DPRINTK("\n"); | |
805 | specs->max_x = block[1]; | |
806 | specs->max_y = block[2]; | |
807 | DPRINTK(" Max H-size in cm: "); | |
808 | if (specs->max_x) | |
809 | DPRINTK("%d\n", specs->max_x); | |
810 | else | |
811 | DPRINTK("variable\n"); | |
812 | DPRINTK(" Max V-size in cm: "); | |
813 | if (specs->max_y) | |
814 | DPRINTK("%d\n", specs->max_y); | |
815 | else | |
816 | DPRINTK("variable\n"); | |
817 | ||
818 | c = block[3]; | |
819 | specs->gamma = c+100; | |
820 | DPRINTK(" Gamma: "); | |
821 | DPRINTK("%d.%d\n", specs->gamma/100, specs->gamma % 100); | |
822 | ||
823 | get_dpms_capabilities(block[4], specs); | |
824 | ||
825 | switch ((block[4] & 0x18) >> 3) { | |
826 | case 0: | |
827 | DPRINTK(" Monochrome/Grayscale\n"); | |
828 | specs->input |= FB_DISP_MONO; | |
829 | break; | |
830 | case 1: | |
831 | DPRINTK(" RGB Color Display\n"); | |
832 | specs->input |= FB_DISP_RGB; | |
833 | break; | |
834 | case 2: | |
835 | DPRINTK(" Non-RGB Multicolor Display\n"); | |
836 | specs->input |= FB_DISP_MULTI; | |
837 | break; | |
838 | default: | |
839 | DPRINTK(" Unknown\n"); | |
840 | specs->input |= FB_DISP_UNKNOWN; | |
841 | break; | |
842 | } | |
843 | ||
844 | get_chroma(block, specs); | |
845 | ||
846 | specs->misc = 0; | |
847 | c = block[4] & 0x7; | |
848 | if (c & 0x04) { | |
849 | DPRINTK(" Default color format is primary\n"); | |
850 | specs->misc |= FB_MISC_PRIM_COLOR; | |
851 | } | |
852 | if (c & 0x02) { | |
853 | DPRINTK(" First DETAILED Timing is preferred\n"); | |
854 | specs->misc |= FB_MISC_1ST_DETAIL; | |
855 | } | |
856 | if (c & 0x01) { | |
857 | printk(" Display is GTF capable\n"); | |
858 | specs->gtf = 1; | |
859 | } | |
860 | } | |
861 | ||
1da177e4 LT |
862 | int fb_parse_edid(unsigned char *edid, struct fb_var_screeninfo *var) |
863 | { | |
864 | int i; | |
865 | unsigned char *block; | |
866 | ||
867 | if (edid == NULL || var == NULL) | |
868 | return 1; | |
869 | ||
870 | if (!(edid_checksum(edid))) | |
871 | return 1; | |
872 | ||
873 | if (!(edid_check_header(edid))) | |
874 | return 1; | |
875 | ||
876 | block = edid + DETAILED_TIMING_DESCRIPTIONS_START; | |
877 | ||
878 | for (i = 0; i < 4; i++, block += DETAILED_TIMING_DESCRIPTION_SIZE) { | |
879 | if (edid_is_timing_block(block)) { | |
880 | var->xres = var->xres_virtual = H_ACTIVE; | |
881 | var->yres = var->yres_virtual = V_ACTIVE; | |
882 | var->height = var->width = -1; | |
883 | var->right_margin = H_SYNC_OFFSET; | |
884 | var->left_margin = (H_ACTIVE + H_BLANKING) - | |
885 | (H_ACTIVE + H_SYNC_OFFSET + H_SYNC_WIDTH); | |
886 | var->upper_margin = V_BLANKING - V_SYNC_OFFSET - | |
887 | V_SYNC_WIDTH; | |
888 | var->lower_margin = V_SYNC_OFFSET; | |
889 | var->hsync_len = H_SYNC_WIDTH; | |
890 | var->vsync_len = V_SYNC_WIDTH; | |
891 | var->pixclock = PIXEL_CLOCK; | |
892 | var->pixclock /= 1000; | |
893 | var->pixclock = KHZ2PICOS(var->pixclock); | |
894 | ||
895 | if (HSYNC_POSITIVE) | |
896 | var->sync |= FB_SYNC_HOR_HIGH_ACT; | |
897 | if (VSYNC_POSITIVE) | |
898 | var->sync |= FB_SYNC_VERT_HIGH_ACT; | |
899 | return 0; | |
900 | } | |
901 | } | |
902 | return 1; | |
903 | } | |
904 | ||
905 | void fb_edid_to_monspecs(unsigned char *edid, struct fb_monspecs *specs) | |
906 | { | |
907 | unsigned char *block; | |
475666d4 | 908 | int i, found = 0; |
1da177e4 LT |
909 | |
910 | if (edid == NULL) | |
911 | return; | |
912 | ||
913 | if (!(edid_checksum(edid))) | |
914 | return; | |
915 | ||
916 | if (!(edid_check_header(edid))) | |
917 | return; | |
918 | ||
919 | memset(specs, 0, sizeof(struct fb_monspecs)); | |
920 | ||
921 | specs->version = edid[EDID_STRUCT_VERSION]; | |
922 | specs->revision = edid[EDID_STRUCT_REVISION]; | |
923 | ||
924 | DPRINTK("========================================\n"); | |
925 | DPRINTK("Display Information (EDID)\n"); | |
926 | DPRINTK("========================================\n"); | |
927 | DPRINTK(" EDID Version %d.%d\n", (int) specs->version, | |
928 | (int) specs->revision); | |
929 | ||
930 | parse_vendor_block(edid + ID_MANUFACTURER_NAME, specs); | |
931 | ||
932 | block = edid + DETAILED_TIMING_DESCRIPTIONS_START; | |
933 | for (i = 0; i < 4; i++, block += DETAILED_TIMING_DESCRIPTION_SIZE) { | |
934 | if (edid_is_serial_block(block)) { | |
935 | copy_string(block, specs->serial_no); | |
936 | DPRINTK(" Serial Number: %s\n", specs->serial_no); | |
937 | } else if (edid_is_ascii_block(block)) { | |
938 | copy_string(block, specs->ascii); | |
939 | DPRINTK(" ASCII Block: %s\n", specs->ascii); | |
940 | } else if (edid_is_monitor_block(block)) { | |
941 | copy_string(block, specs->monitor); | |
942 | DPRINTK(" Monitor Name: %s\n", specs->monitor); | |
943 | } | |
944 | } | |
945 | ||
946 | DPRINTK(" Display Characteristics:\n"); | |
947 | get_monspecs(edid, specs); | |
948 | ||
949 | specs->modedb = fb_create_modedb(edid, &specs->modedb_len); | |
475666d4 AD |
950 | |
951 | /* | |
952 | * Workaround for buggy EDIDs that sets that the first | |
953 | * detailed timing is preferred but has not detailed | |
954 | * timing specified | |
955 | */ | |
956 | for (i = 0; i < specs->modedb_len; i++) { | |
957 | if (specs->modedb[i].flag & FB_MODE_IS_DETAILED) { | |
958 | found = 1; | |
959 | break; | |
960 | } | |
961 | } | |
962 | ||
963 | if (!found) | |
964 | specs->misc &= ~FB_MISC_1ST_DETAIL; | |
965 | ||
1da177e4 LT |
966 | DPRINTK("========================================\n"); |
967 | } | |
968 | ||
8c85fd89 AH |
969 | /* |
970 | * VESA Generalized Timing Formula (GTF) | |
1da177e4 LT |
971 | */ |
972 | ||
973 | #define FLYBACK 550 | |
974 | #define V_FRONTPORCH 1 | |
975 | #define H_OFFSET 40 | |
976 | #define H_SCALEFACTOR 20 | |
977 | #define H_BLANKSCALE 128 | |
978 | #define H_GRADIENT 600 | |
979 | #define C_VAL 30 | |
980 | #define M_VAL 300 | |
981 | ||
982 | struct __fb_timings { | |
983 | u32 dclk; | |
984 | u32 hfreq; | |
985 | u32 vfreq; | |
986 | u32 hactive; | |
987 | u32 vactive; | |
988 | u32 hblank; | |
989 | u32 vblank; | |
990 | u32 htotal; | |
991 | u32 vtotal; | |
992 | }; | |
993 | ||
994 | /** | |
995 | * fb_get_vblank - get vertical blank time | |
996 | * @hfreq: horizontal freq | |
997 | * | |
998 | * DESCRIPTION: | |
8c85fd89 | 999 | * vblank = right_margin + vsync_len + left_margin |
1da177e4 LT |
1000 | * |
1001 | * given: right_margin = 1 (V_FRONTPORCH) | |
1002 | * vsync_len = 3 | |
1003 | * flyback = 550 | |
1004 | * | |
1005 | * flyback * hfreq | |
1006 | * left_margin = --------------- - vsync_len | |
1007 | * 1000000 | |
1008 | */ | |
1009 | static u32 fb_get_vblank(u32 hfreq) | |
1010 | { | |
1011 | u32 vblank; | |
1012 | ||
8c85fd89 | 1013 | vblank = (hfreq * FLYBACK)/1000; |
1da177e4 LT |
1014 | vblank = (vblank + 500)/1000; |
1015 | return (vblank + V_FRONTPORCH); | |
1016 | } | |
1017 | ||
8c85fd89 | 1018 | /** |
1da177e4 LT |
1019 | * fb_get_hblank_by_freq - get horizontal blank time given hfreq |
1020 | * @hfreq: horizontal freq | |
1021 | * @xres: horizontal resolution in pixels | |
1022 | * | |
1023 | * DESCRIPTION: | |
1024 | * | |
1025 | * xres * duty_cycle | |
1026 | * hblank = ------------------ | |
1027 | * 100 - duty_cycle | |
1028 | * | |
1029 | * duty cycle = percent of htotal assigned to inactive display | |
1030 | * duty cycle = C - (M/Hfreq) | |
1031 | * | |
1032 | * where: C = ((offset - scale factor) * blank_scale) | |
1033 | * -------------------------------------- + scale factor | |
8c85fd89 | 1034 | * 256 |
1da177e4 LT |
1035 | * M = blank_scale * gradient |
1036 | * | |
1037 | */ | |
1038 | static u32 fb_get_hblank_by_hfreq(u32 hfreq, u32 xres) | |
1039 | { | |
1040 | u32 c_val, m_val, duty_cycle, hblank; | |
1041 | ||
8c85fd89 | 1042 | c_val = (((H_OFFSET - H_SCALEFACTOR) * H_BLANKSCALE)/256 + |
1da177e4 LT |
1043 | H_SCALEFACTOR) * 1000; |
1044 | m_val = (H_BLANKSCALE * H_GRADIENT)/256; | |
1045 | m_val = (m_val * 1000000)/hfreq; | |
1046 | duty_cycle = c_val - m_val; | |
1047 | hblank = (xres * duty_cycle)/(100000 - duty_cycle); | |
1048 | return (hblank); | |
1049 | } | |
1050 | ||
8c85fd89 | 1051 | /** |
1da177e4 LT |
1052 | * fb_get_hblank_by_dclk - get horizontal blank time given pixelclock |
1053 | * @dclk: pixelclock in Hz | |
1054 | * @xres: horizontal resolution in pixels | |
1055 | * | |
1056 | * DESCRIPTION: | |
1057 | * | |
1058 | * xres * duty_cycle | |
1059 | * hblank = ------------------ | |
1060 | * 100 - duty_cycle | |
1061 | * | |
1062 | * duty cycle = percent of htotal assigned to inactive display | |
1063 | * duty cycle = C - (M * h_period) | |
8c85fd89 | 1064 | * |
1da177e4 LT |
1065 | * where: h_period = SQRT(100 - C + (0.4 * xres * M)/dclk) + C - 100 |
1066 | * ----------------------------------------------- | |
1067 | * 2 * M | |
1068 | * M = 300; | |
1069 | * C = 30; | |
1070 | ||
1071 | */ | |
1072 | static u32 fb_get_hblank_by_dclk(u32 dclk, u32 xres) | |
1073 | { | |
1074 | u32 duty_cycle, h_period, hblank; | |
1075 | ||
1076 | dclk /= 1000; | |
1077 | h_period = 100 - C_VAL; | |
1078 | h_period *= h_period; | |
1079 | h_period += (M_VAL * xres * 2 * 1000)/(5 * dclk); | |
8c85fd89 | 1080 | h_period *= 10000; |
1da177e4 LT |
1081 | |
1082 | h_period = int_sqrt(h_period); | |
1083 | h_period -= (100 - C_VAL) * 100; | |
8c85fd89 | 1084 | h_period *= 1000; |
1da177e4 LT |
1085 | h_period /= 2 * M_VAL; |
1086 | ||
1087 | duty_cycle = C_VAL * 1000 - (M_VAL * h_period)/100; | |
1088 | hblank = (xres * duty_cycle)/(100000 - duty_cycle) + 8; | |
1089 | hblank &= ~15; | |
1090 | return (hblank); | |
1091 | } | |
8c85fd89 | 1092 | |
1da177e4 LT |
1093 | /** |
1094 | * fb_get_hfreq - estimate hsync | |
1095 | * @vfreq: vertical refresh rate | |
1096 | * @yres: vertical resolution | |
1097 | * | |
1098 | * DESCRIPTION: | |
1099 | * | |
1100 | * (yres + front_port) * vfreq * 1000000 | |
1101 | * hfreq = ------------------------------------- | |
1102 | * (1000000 - (vfreq * FLYBACK) | |
8c85fd89 | 1103 | * |
1da177e4 LT |
1104 | */ |
1105 | ||
1106 | static u32 fb_get_hfreq(u32 vfreq, u32 yres) | |
1107 | { | |
1108 | u32 divisor, hfreq; | |
8c85fd89 | 1109 | |
1da177e4 LT |
1110 | divisor = (1000000 - (vfreq * FLYBACK))/1000; |
1111 | hfreq = (yres + V_FRONTPORCH) * vfreq * 1000; | |
1112 | return (hfreq/divisor); | |
1113 | } | |
1114 | ||
1115 | static void fb_timings_vfreq(struct __fb_timings *timings) | |
1116 | { | |
1117 | timings->hfreq = fb_get_hfreq(timings->vfreq, timings->vactive); | |
1118 | timings->vblank = fb_get_vblank(timings->hfreq); | |
1119 | timings->vtotal = timings->vactive + timings->vblank; | |
8c85fd89 | 1120 | timings->hblank = fb_get_hblank_by_hfreq(timings->hfreq, |
1da177e4 LT |
1121 | timings->hactive); |
1122 | timings->htotal = timings->hactive + timings->hblank; | |
1123 | timings->dclk = timings->htotal * timings->hfreq; | |
1124 | } | |
1125 | ||
1126 | static void fb_timings_hfreq(struct __fb_timings *timings) | |
1127 | { | |
1128 | timings->vblank = fb_get_vblank(timings->hfreq); | |
1129 | timings->vtotal = timings->vactive + timings->vblank; | |
1130 | timings->vfreq = timings->hfreq/timings->vtotal; | |
8c85fd89 | 1131 | timings->hblank = fb_get_hblank_by_hfreq(timings->hfreq, |
1da177e4 LT |
1132 | timings->hactive); |
1133 | timings->htotal = timings->hactive + timings->hblank; | |
1134 | timings->dclk = timings->htotal * timings->hfreq; | |
1135 | } | |
1136 | ||
1137 | static void fb_timings_dclk(struct __fb_timings *timings) | |
1138 | { | |
8c85fd89 | 1139 | timings->hblank = fb_get_hblank_by_dclk(timings->dclk, |
1da177e4 LT |
1140 | timings->hactive); |
1141 | timings->htotal = timings->hactive + timings->hblank; | |
1142 | timings->hfreq = timings->dclk/timings->htotal; | |
1143 | timings->vblank = fb_get_vblank(timings->hfreq); | |
1144 | timings->vtotal = timings->vactive + timings->vblank; | |
1145 | timings->vfreq = timings->hfreq/timings->vtotal; | |
1146 | } | |
1147 | ||
1148 | /* | |
1149 | * fb_get_mode - calculates video mode using VESA GTF | |
1150 | * @flags: if: 0 - maximize vertical refresh rate | |
1151 | * 1 - vrefresh-driven calculation; | |
1152 | * 2 - hscan-driven calculation; | |
1153 | * 3 - pixelclock-driven calculation; | |
1154 | * @val: depending on @flags, ignored, vrefresh, hsync or pixelclock | |
1155 | * @var: pointer to fb_var_screeninfo | |
1156 | * @info: pointer to fb_info | |
1157 | * | |
1158 | * DESCRIPTION: | |
8c85fd89 AH |
1159 | * Calculates video mode based on monitor specs using VESA GTF. |
1160 | * The GTF is best for VESA GTF compliant monitors but is | |
1da177e4 LT |
1161 | * specifically formulated to work for older monitors as well. |
1162 | * | |
8c85fd89 | 1163 | * If @flag==0, the function will attempt to maximize the |
1da177e4 | 1164 | * refresh rate. Otherwise, it will calculate timings based on |
8c85fd89 | 1165 | * the flag and accompanying value. |
1da177e4 | 1166 | * |
8c85fd89 | 1167 | * If FB_IGNOREMON bit is set in @flags, monitor specs will be |
1da177e4 LT |
1168 | * ignored and @var will be filled with the calculated timings. |
1169 | * | |
1170 | * All calculations are based on the VESA GTF Spreadsheet | |
1171 | * available at VESA's public ftp (http://www.vesa.org). | |
8c85fd89 | 1172 | * |
1da177e4 LT |
1173 | * NOTES: |
1174 | * The timings generated by the GTF will be different from VESA | |
1175 | * DMT. It might be a good idea to keep a table of standard | |
1176 | * VESA modes as well. The GTF may also not work for some displays, | |
1177 | * such as, and especially, analog TV. | |
8c85fd89 | 1178 | * |
1da177e4 LT |
1179 | * REQUIRES: |
1180 | * A valid info->monspecs, otherwise 'safe numbers' will be used. | |
8c85fd89 | 1181 | */ |
1da177e4 LT |
1182 | int fb_get_mode(int flags, u32 val, struct fb_var_screeninfo *var, struct fb_info *info) |
1183 | { | |
af5d0f7e | 1184 | struct __fb_timings *timings; |
1da177e4 | 1185 | u32 interlace = 1, dscan = 1; |
af5d0f7e AD |
1186 | u32 hfmin, hfmax, vfmin, vfmax, dclkmin, dclkmax, err = 0; |
1187 | ||
1188 | ||
1189 | timings = kzalloc(sizeof(struct __fb_timings), GFP_KERNEL); | |
1190 | ||
1191 | if (!timings) | |
1192 | return -ENOMEM; | |
1da177e4 | 1193 | |
8c85fd89 | 1194 | /* |
1da177e4 LT |
1195 | * If monspecs are invalid, use values that are enough |
1196 | * for 640x480@60 | |
1197 | */ | |
af5d0f7e | 1198 | if (!info || !info->monspecs.hfmax || !info->monspecs.vfmax || |
1da177e4 LT |
1199 | !info->monspecs.dclkmax || |
1200 | info->monspecs.hfmax < info->monspecs.hfmin || | |
1201 | info->monspecs.vfmax < info->monspecs.vfmin || | |
1202 | info->monspecs.dclkmax < info->monspecs.dclkmin) { | |
1203 | hfmin = 29000; hfmax = 30000; | |
1204 | vfmin = 60; vfmax = 60; | |
1205 | dclkmin = 0; dclkmax = 25000000; | |
1206 | } else { | |
1207 | hfmin = info->monspecs.hfmin; | |
1208 | hfmax = info->monspecs.hfmax; | |
1209 | vfmin = info->monspecs.vfmin; | |
1210 | vfmax = info->monspecs.vfmax; | |
1211 | dclkmin = info->monspecs.dclkmin; | |
1212 | dclkmax = info->monspecs.dclkmax; | |
1213 | } | |
1214 | ||
af5d0f7e AD |
1215 | timings->hactive = var->xres; |
1216 | timings->vactive = var->yres; | |
8c85fd89 | 1217 | if (var->vmode & FB_VMODE_INTERLACED) { |
af5d0f7e | 1218 | timings->vactive /= 2; |
1da177e4 LT |
1219 | interlace = 2; |
1220 | } | |
1221 | if (var->vmode & FB_VMODE_DOUBLE) { | |
af5d0f7e | 1222 | timings->vactive *= 2; |
1da177e4 LT |
1223 | dscan = 2; |
1224 | } | |
1225 | ||
1226 | switch (flags & ~FB_IGNOREMON) { | |
1227 | case FB_MAXTIMINGS: /* maximize refresh rate */ | |
af5d0f7e AD |
1228 | timings->hfreq = hfmax; |
1229 | fb_timings_hfreq(timings); | |
1230 | if (timings->vfreq > vfmax) { | |
1231 | timings->vfreq = vfmax; | |
1232 | fb_timings_vfreq(timings); | |
1da177e4 | 1233 | } |
af5d0f7e AD |
1234 | if (timings->dclk > dclkmax) { |
1235 | timings->dclk = dclkmax; | |
1236 | fb_timings_dclk(timings); | |
1da177e4 LT |
1237 | } |
1238 | break; | |
1239 | case FB_VSYNCTIMINGS: /* vrefresh driven */ | |
af5d0f7e AD |
1240 | timings->vfreq = val; |
1241 | fb_timings_vfreq(timings); | |
1da177e4 LT |
1242 | break; |
1243 | case FB_HSYNCTIMINGS: /* hsync driven */ | |
af5d0f7e AD |
1244 | timings->hfreq = val; |
1245 | fb_timings_hfreq(timings); | |
1da177e4 LT |
1246 | break; |
1247 | case FB_DCLKTIMINGS: /* pixelclock driven */ | |
af5d0f7e AD |
1248 | timings->dclk = PICOS2KHZ(val) * 1000; |
1249 | fb_timings_dclk(timings); | |
1da177e4 LT |
1250 | break; |
1251 | default: | |
af5d0f7e | 1252 | err = -EINVAL; |
8c85fd89 AH |
1253 | |
1254 | } | |
1255 | ||
af5d0f7e AD |
1256 | if (err || (!(flags & FB_IGNOREMON) && |
1257 | (timings->vfreq < vfmin || timings->vfreq > vfmax || | |
1258 | timings->hfreq < hfmin || timings->hfreq > hfmax || | |
1259 | timings->dclk < dclkmin || timings->dclk > dclkmax))) { | |
1260 | err = -EINVAL; | |
1261 | } else { | |
1262 | var->pixclock = KHZ2PICOS(timings->dclk/1000); | |
1263 | var->hsync_len = (timings->htotal * 8)/100; | |
1264 | var->right_margin = (timings->hblank/2) - var->hsync_len; | |
1265 | var->left_margin = timings->hblank - var->right_margin - | |
1266 | var->hsync_len; | |
1267 | var->vsync_len = (3 * interlace)/dscan; | |
1268 | var->lower_margin = (1 * interlace)/dscan; | |
1269 | var->upper_margin = (timings->vblank * interlace)/dscan - | |
1270 | (var->vsync_len + var->lower_margin); | |
1271 | } | |
8c85fd89 | 1272 | |
af5d0f7e AD |
1273 | kfree(timings); |
1274 | return err; | |
1da177e4 LT |
1275 | } |
1276 | #else | |
1277 | int fb_parse_edid(unsigned char *edid, struct fb_var_screeninfo *var) | |
1278 | { | |
1279 | return 1; | |
1280 | } | |
1281 | void fb_edid_to_monspecs(unsigned char *edid, struct fb_monspecs *specs) | |
1282 | { | |
1283 | specs = NULL; | |
1284 | } | |
1285 | void fb_destroy_modedb(struct fb_videomode *modedb) | |
1286 | { | |
1287 | } | |
1288 | int fb_get_mode(int flags, u32 val, struct fb_var_screeninfo *var, | |
1289 | struct fb_info *info) | |
1290 | { | |
1291 | return -EINVAL; | |
1292 | } | |
1293 | #endif /* CONFIG_FB_MODE_HELPERS */ | |
8c85fd89 | 1294 | |
1da177e4 LT |
1295 | /* |
1296 | * fb_validate_mode - validates var against monitor capabilities | |
1297 | * @var: pointer to fb_var_screeninfo | |
1298 | * @info: pointer to fb_info | |
1299 | * | |
1300 | * DESCRIPTION: | |
1301 | * Validates video mode against monitor capabilities specified in | |
1302 | * info->monspecs. | |
1303 | * | |
1304 | * REQUIRES: | |
1305 | * A valid info->monspecs. | |
1306 | */ | |
1307 | int fb_validate_mode(const struct fb_var_screeninfo *var, struct fb_info *info) | |
1308 | { | |
1309 | u32 hfreq, vfreq, htotal, vtotal, pixclock; | |
1310 | u32 hfmin, hfmax, vfmin, vfmax, dclkmin, dclkmax; | |
1311 | ||
8c85fd89 | 1312 | /* |
1da177e4 LT |
1313 | * If monspecs are invalid, use values that are enough |
1314 | * for 640x480@60 | |
1315 | */ | |
1316 | if (!info->monspecs.hfmax || !info->monspecs.vfmax || | |
1317 | !info->monspecs.dclkmax || | |
1318 | info->monspecs.hfmax < info->monspecs.hfmin || | |
1319 | info->monspecs.vfmax < info->monspecs.vfmin || | |
1320 | info->monspecs.dclkmax < info->monspecs.dclkmin) { | |
1321 | hfmin = 29000; hfmax = 30000; | |
1322 | vfmin = 60; vfmax = 60; | |
1323 | dclkmin = 0; dclkmax = 25000000; | |
1324 | } else { | |
1325 | hfmin = info->monspecs.hfmin; | |
1326 | hfmax = info->monspecs.hfmax; | |
1327 | vfmin = info->monspecs.vfmin; | |
1328 | vfmax = info->monspecs.vfmax; | |
1329 | dclkmin = info->monspecs.dclkmin; | |
1330 | dclkmax = info->monspecs.dclkmax; | |
1331 | } | |
1332 | ||
1333 | if (!var->pixclock) | |
1334 | return -EINVAL; | |
1335 | pixclock = PICOS2KHZ(var->pixclock) * 1000; | |
8c85fd89 AH |
1336 | |
1337 | htotal = var->xres + var->right_margin + var->hsync_len + | |
1da177e4 | 1338 | var->left_margin; |
8c85fd89 | 1339 | vtotal = var->yres + var->lower_margin + var->vsync_len + |
1da177e4 LT |
1340 | var->upper_margin; |
1341 | ||
1342 | if (var->vmode & FB_VMODE_INTERLACED) | |
1343 | vtotal /= 2; | |
1344 | if (var->vmode & FB_VMODE_DOUBLE) | |
1345 | vtotal *= 2; | |
1346 | ||
1347 | hfreq = pixclock/htotal; | |
0a793b77 JS |
1348 | hfreq = (hfreq + 500) / 1000 * 1000; |
1349 | ||
1da177e4 LT |
1350 | vfreq = hfreq/vtotal; |
1351 | ||
8c85fd89 | 1352 | return (vfreq < vfmin || vfreq > vfmax || |
1da177e4 LT |
1353 | hfreq < hfmin || hfreq > hfmax || |
1354 | pixclock < dclkmin || pixclock > dclkmax) ? | |
1355 | -EINVAL : 0; | |
1356 | } | |
1357 | ||
ba70710e | 1358 | #if defined(CONFIG_FIRMWARE_EDID) && defined(CONFIG_X86) |
5e518d76 AD |
1359 | |
1360 | /* | |
1361 | * We need to ensure that the EDID block is only returned for | |
1362 | * the primary graphics adapter. | |
1363 | */ | |
1364 | ||
1365 | const unsigned char *fb_firmware_edid(struct device *device) | |
1366 | { | |
1367 | struct pci_dev *dev = NULL; | |
1368 | struct resource *res = NULL; | |
1369 | unsigned char *edid = NULL; | |
1370 | ||
1371 | if (device) | |
1372 | dev = to_pci_dev(device); | |
1373 | ||
1374 | if (dev) | |
1375 | res = &dev->resource[PCI_ROM_RESOURCE]; | |
1376 | ||
1377 | if (res && res->flags & IORESOURCE_ROM_SHADOW) | |
1378 | edid = edid_info.dummy; | |
1379 | ||
1380 | return edid; | |
1381 | } | |
1382 | #else | |
1383 | const unsigned char *fb_firmware_edid(struct device *device) | |
1384 | { | |
1385 | return NULL; | |
1386 | } | |
59153f7d AD |
1387 | #endif |
1388 | EXPORT_SYMBOL(fb_firmware_edid); | |
5e518d76 | 1389 | |
1da177e4 LT |
1390 | EXPORT_SYMBOL(fb_parse_edid); |
1391 | EXPORT_SYMBOL(fb_edid_to_monspecs); | |
1da177e4 LT |
1392 | EXPORT_SYMBOL(fb_get_mode); |
1393 | EXPORT_SYMBOL(fb_validate_mode); | |
1394 | EXPORT_SYMBOL(fb_destroy_modedb); |