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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: | |
7 | * | |
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> | |
15 | * | |
16 | * 3. John Fremlin <vii@users.sourceforge.net> and | |
17 | * Ani Joshi <ajoshi@unixbox.com> | |
18 | * | |
19 | * Generalized Timing Formula is derived from: | |
20 | * | |
21 | * GTF Spreadsheet by Andy Morrish (1/5/97) | |
22 | * available at 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 | */ | |
29 | #include <linux/tty.h> | |
30 | #include <linux/fb.h> | |
31 | #include <linux/module.h> | |
32 | #ifdef CONFIG_PPC_OF | |
33 | #include <linux/pci.h> | |
34 | #include <asm/prom.h> | |
35 | #include <asm/pci-bridge.h> | |
36 | #endif | |
1da177e4 LT |
37 | #include "edid.h" |
38 | ||
39 | /* | |
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 | ||
51 | #define FBMON_FIX_HEADER 1 | |
52 | #define FBMON_FIX_INPUT 2 | |
53 | ||
54 | #ifdef CONFIG_FB_MODE_HELPERS | |
55 | struct broken_edid { | |
56 | u8 manufacturer[4]; | |
57 | u32 model; | |
58 | u32 fix; | |
59 | }; | |
60 | ||
61 | static struct broken_edid brokendb[] = { | |
62 | /* DEC FR-PCXAV-YZ */ | |
63 | { | |
64 | .manufacturer = "DEC", | |
65 | .model = 0x073a, | |
66 | .fix = FBMON_FIX_HEADER, | |
67 | }, | |
68 | /* ViewSonic PF775a */ | |
69 | { | |
70 | .manufacturer = "VSC", | |
71 | .model = 0x5a44, | |
72 | .fix = FBMON_FIX_INPUT, | |
73 | }, | |
74 | }; | |
75 | ||
76 | static const unsigned char edid_v1_header[] = { 0x00, 0xff, 0xff, 0xff, | |
77 | 0xff, 0xff, 0xff, 0x00 | |
78 | }; | |
79 | ||
80 | static void copy_string(unsigned char *c, unsigned char *s) | |
81 | { | |
82 | int i; | |
83 | c = c + 5; | |
84 | for (i = 0; (i < 13 && *c != 0x0A); i++) | |
85 | *(s++) = *(c++); | |
86 | *s = 0; | |
87 | while (i-- && (*--s == 0x20)) *s = 0; | |
88 | } | |
89 | ||
90 | static int check_edid(unsigned char *edid) | |
91 | { | |
92 | unsigned char *block = edid + ID_MANUFACTURER_NAME, manufacturer[4]; | |
93 | unsigned char *b; | |
94 | u32 model; | |
95 | int i, fix = 0, ret = 0; | |
96 | ||
97 | manufacturer[0] = ((block[0] & 0x7c) >> 2) + '@'; | |
98 | manufacturer[1] = ((block[0] & 0x03) << 3) + | |
99 | ((block[1] & 0xe0) >> 5) + '@'; | |
100 | manufacturer[2] = (block[1] & 0x1f) + '@'; | |
101 | manufacturer[3] = 0; | |
102 | model = block[2] + (block[3] << 8); | |
103 | ||
104 | for (i = 0; i < ARRAY_SIZE(brokendb); i++) { | |
105 | if (!strncmp(manufacturer, brokendb[i].manufacturer, 4) && | |
106 | brokendb[i].model == model) { | |
107 | printk("fbmon: The EDID Block of " | |
108 | "Manufacturer: %s Model: 0x%x is known to " | |
109 | "be broken,\n", manufacturer, model); | |
110 | fix = brokendb[i].fix; | |
111 | break; | |
112 | } | |
113 | } | |
114 | ||
115 | switch (fix) { | |
116 | case FBMON_FIX_HEADER: | |
117 | for (i = 0; i < 8; i++) { | |
118 | if (edid[i] != edid_v1_header[i]) | |
119 | ret = fix; | |
120 | } | |
121 | break; | |
122 | case FBMON_FIX_INPUT: | |
123 | b = edid + EDID_STRUCT_DISPLAY; | |
124 | /* Only if display is GTF capable will | |
125 | the input type be reset to analog */ | |
126 | if (b[4] & 0x01 && b[0] & 0x80) | |
127 | ret = fix; | |
128 | break; | |
129 | } | |
130 | ||
131 | return ret; | |
132 | } | |
133 | ||
134 | static void fix_edid(unsigned char *edid, int fix) | |
135 | { | |
136 | unsigned char *b; | |
137 | ||
138 | switch (fix) { | |
139 | case FBMON_FIX_HEADER: | |
140 | printk("fbmon: trying a header reconstruct\n"); | |
141 | memcpy(edid, edid_v1_header, 8); | |
142 | break; | |
143 | case FBMON_FIX_INPUT: | |
144 | printk("fbmon: trying to fix input type\n"); | |
145 | b = edid + EDID_STRUCT_DISPLAY; | |
146 | b[0] &= ~0x80; | |
147 | edid[127] += 0x80; | |
148 | } | |
149 | } | |
150 | ||
151 | static int edid_checksum(unsigned char *edid) | |
152 | { | |
153 | unsigned char i, csum = 0, all_null = 0; | |
154 | int err = 0, fix = check_edid(edid); | |
155 | ||
156 | if (fix) | |
157 | fix_edid(edid, fix); | |
158 | ||
159 | for (i = 0; i < EDID_LENGTH; i++) { | |
160 | csum += edid[i]; | |
161 | all_null |= edid[i]; | |
162 | } | |
163 | ||
164 | if (csum == 0x00 && all_null) { | |
165 | /* checksum passed, everything's good */ | |
166 | err = 1; | |
167 | } | |
168 | ||
169 | return err; | |
170 | } | |
171 | ||
172 | static int edid_check_header(unsigned char *edid) | |
173 | { | |
174 | int i, err = 1, fix = check_edid(edid); | |
175 | ||
176 | if (fix) | |
177 | fix_edid(edid, fix); | |
178 | ||
179 | for (i = 0; i < 8; i++) { | |
180 | if (edid[i] != edid_v1_header[i]) | |
181 | err = 0; | |
182 | } | |
183 | ||
184 | return err; | |
185 | } | |
186 | ||
187 | static void parse_vendor_block(unsigned char *block, struct fb_monspecs *specs) | |
188 | { | |
189 | specs->manufacturer[0] = ((block[0] & 0x7c) >> 2) + '@'; | |
190 | specs->manufacturer[1] = ((block[0] & 0x03) << 3) + | |
191 | ((block[1] & 0xe0) >> 5) + '@'; | |
192 | specs->manufacturer[2] = (block[1] & 0x1f) + '@'; | |
193 | specs->manufacturer[3] = 0; | |
194 | specs->model = block[2] + (block[3] << 8); | |
195 | specs->serial = block[4] + (block[5] << 8) + | |
196 | (block[6] << 16) + (block[7] << 24); | |
197 | specs->year = block[9] + 1990; | |
198 | specs->week = block[8]; | |
199 | DPRINTK(" Manufacturer: %s\n", specs->manufacturer); | |
200 | DPRINTK(" Model: %x\n", specs->model); | |
201 | DPRINTK(" Serial#: %u\n", specs->serial); | |
202 | DPRINTK(" Year: %u Week %u\n", specs->year, specs->week); | |
203 | } | |
204 | ||
205 | static void get_dpms_capabilities(unsigned char flags, | |
206 | struct fb_monspecs *specs) | |
207 | { | |
208 | specs->dpms = 0; | |
209 | if (flags & DPMS_ACTIVE_OFF) | |
210 | specs->dpms |= FB_DPMS_ACTIVE_OFF; | |
211 | if (flags & DPMS_SUSPEND) | |
212 | specs->dpms |= FB_DPMS_SUSPEND; | |
213 | if (flags & DPMS_STANDBY) | |
214 | specs->dpms |= FB_DPMS_STANDBY; | |
215 | DPRINTK(" DPMS: Active %s, Suspend %s, Standby %s\n", | |
216 | (flags & DPMS_ACTIVE_OFF) ? "yes" : "no", | |
217 | (flags & DPMS_SUSPEND) ? "yes" : "no", | |
218 | (flags & DPMS_STANDBY) ? "yes" : "no"); | |
219 | } | |
220 | ||
221 | static void get_chroma(unsigned char *block, struct fb_monspecs *specs) | |
222 | { | |
223 | int tmp; | |
224 | ||
225 | DPRINTK(" Chroma\n"); | |
226 | /* Chromaticity data */ | |
227 | tmp = ((block[5] & (3 << 6)) >> 6) | (block[0x7] << 2); | |
228 | tmp *= 1000; | |
229 | tmp += 512; | |
230 | specs->chroma.redx = tmp/1024; | |
231 | DPRINTK(" RedX: 0.%03d ", specs->chroma.redx); | |
232 | ||
233 | tmp = ((block[5] & (3 << 4)) >> 4) | (block[0x8] << 2); | |
234 | tmp *= 1000; | |
235 | tmp += 512; | |
236 | specs->chroma.redy = tmp/1024; | |
237 | DPRINTK("RedY: 0.%03d\n", specs->chroma.redy); | |
238 | ||
239 | tmp = ((block[5] & (3 << 2)) >> 2) | (block[0x9] << 2); | |
240 | tmp *= 1000; | |
241 | tmp += 512; | |
242 | specs->chroma.greenx = tmp/1024; | |
243 | DPRINTK(" GreenX: 0.%03d ", specs->chroma.greenx); | |
244 | ||
245 | tmp = (block[5] & 3) | (block[0xa] << 2); | |
246 | tmp *= 1000; | |
247 | tmp += 512; | |
248 | specs->chroma.greeny = tmp/1024; | |
249 | DPRINTK("GreenY: 0.%03d\n", specs->chroma.greeny); | |
250 | ||
251 | tmp = ((block[6] & (3 << 6)) >> 6) | (block[0xb] << 2); | |
252 | tmp *= 1000; | |
253 | tmp += 512; | |
254 | specs->chroma.bluex = tmp/1024; | |
255 | DPRINTK(" BlueX: 0.%03d ", specs->chroma.bluex); | |
256 | ||
257 | tmp = ((block[6] & (3 << 4)) >> 4) | (block[0xc] << 2); | |
258 | tmp *= 1000; | |
259 | tmp += 512; | |
260 | specs->chroma.bluey = tmp/1024; | |
261 | DPRINTK("BlueY: 0.%03d\n", specs->chroma.bluey); | |
262 | ||
263 | tmp = ((block[6] & (3 << 2)) >> 2) | (block[0xd] << 2); | |
264 | tmp *= 1000; | |
265 | tmp += 512; | |
266 | specs->chroma.whitex = tmp/1024; | |
267 | DPRINTK(" WhiteX: 0.%03d ", specs->chroma.whitex); | |
268 | ||
269 | tmp = (block[6] & 3) | (block[0xe] << 2); | |
270 | tmp *= 1000; | |
271 | tmp += 512; | |
272 | specs->chroma.whitey = tmp/1024; | |
273 | DPRINTK("WhiteY: 0.%03d\n", specs->chroma.whitey); | |
274 | } | |
275 | ||
276 | static int edid_is_serial_block(unsigned char *block) | |
277 | { | |
278 | if ((block[0] == 0x00) && (block[1] == 0x00) && | |
279 | (block[2] == 0x00) && (block[3] == 0xff) && | |
280 | (block[4] == 0x00)) | |
281 | return 1; | |
282 | else | |
283 | return 0; | |
284 | } | |
285 | ||
286 | static int edid_is_ascii_block(unsigned char *block) | |
287 | { | |
288 | if ((block[0] == 0x00) && (block[1] == 0x00) && | |
289 | (block[2] == 0x00) && (block[3] == 0xfe) && | |
290 | (block[4] == 0x00)) | |
291 | return 1; | |
292 | else | |
293 | return 0; | |
294 | } | |
295 | ||
296 | static int edid_is_limits_block(unsigned char *block) | |
297 | { | |
298 | if ((block[0] == 0x00) && (block[1] == 0x00) && | |
299 | (block[2] == 0x00) && (block[3] == 0xfd) && | |
300 | (block[4] == 0x00)) | |
301 | return 1; | |
302 | else | |
303 | return 0; | |
304 | } | |
305 | ||
306 | static int edid_is_monitor_block(unsigned char *block) | |
307 | { | |
308 | if ((block[0] == 0x00) && (block[1] == 0x00) && | |
309 | (block[2] == 0x00) && (block[3] == 0xfc) && | |
310 | (block[4] == 0x00)) | |
311 | return 1; | |
312 | else | |
313 | return 0; | |
314 | } | |
315 | ||
316 | static void calc_mode_timings(int xres, int yres, int refresh, struct fb_videomode *mode) | |
317 | { | |
318 | struct fb_var_screeninfo var; | |
319 | struct fb_info info; | |
320 | ||
321 | var.xres = xres; | |
322 | var.yres = yres; | |
323 | fb_get_mode(FB_VSYNCTIMINGS | FB_IGNOREMON, | |
324 | refresh, &var, &info); | |
325 | mode->xres = xres; | |
326 | mode->yres = yres; | |
327 | mode->pixclock = var.pixclock; | |
328 | mode->refresh = refresh; | |
329 | mode->left_margin = var.left_margin; | |
330 | mode->right_margin = var.right_margin; | |
331 | mode->upper_margin = var.upper_margin; | |
332 | mode->lower_margin = var.lower_margin; | |
333 | mode->hsync_len = var.hsync_len; | |
334 | mode->vsync_len = var.vsync_len; | |
335 | mode->vmode = 0; | |
336 | mode->sync = 0; | |
337 | } | |
338 | ||
339 | static int get_est_timing(unsigned char *block, struct fb_videomode *mode) | |
340 | { | |
341 | int num = 0; | |
342 | unsigned char c; | |
343 | ||
344 | c = block[0]; | |
345 | if (c&0x80) { | |
346 | calc_mode_timings(720, 400, 70, &mode[num]); | |
347 | mode[num++].flag = FB_MODE_IS_CALCULATED; | |
348 | DPRINTK(" 720x400@70Hz\n"); | |
349 | } | |
350 | if (c&0x40) { | |
351 | calc_mode_timings(720, 400, 88, &mode[num]); | |
352 | mode[num++].flag = FB_MODE_IS_CALCULATED; | |
353 | DPRINTK(" 720x400@88Hz\n"); | |
354 | } | |
355 | if (c&0x20) { | |
356 | mode[num++] = vesa_modes[3]; | |
357 | DPRINTK(" 640x480@60Hz\n"); | |
358 | } | |
359 | if (c&0x10) { | |
360 | calc_mode_timings(640, 480, 67, &mode[num]); | |
361 | mode[num++].flag = FB_MODE_IS_CALCULATED; | |
362 | DPRINTK(" 640x480@67Hz\n"); | |
363 | } | |
364 | if (c&0x08) { | |
365 | mode[num++] = vesa_modes[4]; | |
366 | DPRINTK(" 640x480@72Hz\n"); | |
367 | } | |
368 | if (c&0x04) { | |
369 | mode[num++] = vesa_modes[5]; | |
370 | DPRINTK(" 640x480@75Hz\n"); | |
371 | } | |
372 | if (c&0x02) { | |
373 | mode[num++] = vesa_modes[7]; | |
374 | DPRINTK(" 800x600@56Hz\n"); | |
375 | } | |
376 | if (c&0x01) { | |
377 | mode[num++] = vesa_modes[8]; | |
378 | DPRINTK(" 800x600@60Hz\n"); | |
379 | } | |
380 | ||
381 | c = block[1]; | |
382 | if (c&0x80) { | |
383 | mode[num++] = vesa_modes[9]; | |
384 | DPRINTK(" 800x600@72Hz\n"); | |
385 | } | |
386 | if (c&0x40) { | |
387 | mode[num++] = vesa_modes[10]; | |
388 | DPRINTK(" 800x600@75Hz\n"); | |
389 | } | |
390 | if (c&0x20) { | |
391 | calc_mode_timings(832, 624, 75, &mode[num]); | |
392 | mode[num++].flag = FB_MODE_IS_CALCULATED; | |
393 | DPRINTK(" 832x624@75Hz\n"); | |
394 | } | |
395 | if (c&0x10) { | |
396 | mode[num++] = vesa_modes[12]; | |
397 | DPRINTK(" 1024x768@87Hz Interlaced\n"); | |
398 | } | |
399 | if (c&0x08) { | |
400 | mode[num++] = vesa_modes[13]; | |
401 | DPRINTK(" 1024x768@60Hz\n"); | |
402 | } | |
403 | if (c&0x04) { | |
404 | mode[num++] = vesa_modes[14]; | |
405 | DPRINTK(" 1024x768@70Hz\n"); | |
406 | } | |
407 | if (c&0x02) { | |
408 | mode[num++] = vesa_modes[15]; | |
409 | DPRINTK(" 1024x768@75Hz\n"); | |
410 | } | |
411 | if (c&0x01) { | |
412 | mode[num++] = vesa_modes[21]; | |
413 | DPRINTK(" 1280x1024@75Hz\n"); | |
414 | } | |
415 | c = block[2]; | |
416 | if (c&0x80) { | |
417 | mode[num++] = vesa_modes[17]; | |
418 | DPRINTK(" 1152x870@75Hz\n"); | |
419 | } | |
420 | DPRINTK(" Manufacturer's mask: %x\n",c&0x7F); | |
421 | return num; | |
422 | } | |
423 | ||
424 | static int get_std_timing(unsigned char *block, struct fb_videomode *mode) | |
425 | { | |
426 | int xres, yres = 0, refresh, ratio, i; | |
427 | ||
428 | xres = (block[0] + 31) * 8; | |
429 | if (xres <= 256) | |
430 | return 0; | |
431 | ||
432 | ratio = (block[1] & 0xc0) >> 6; | |
433 | switch (ratio) { | |
434 | case 0: | |
435 | yres = xres; | |
436 | break; | |
437 | case 1: | |
438 | yres = (xres * 3)/4; | |
439 | break; | |
440 | case 2: | |
441 | yres = (xres * 4)/5; | |
442 | break; | |
443 | case 3: | |
444 | yres = (xres * 9)/16; | |
445 | break; | |
446 | } | |
447 | refresh = (block[1] & 0x3f) + 60; | |
448 | ||
449 | DPRINTK(" %dx%d@%dHz\n", xres, yres, refresh); | |
450 | for (i = 0; i < VESA_MODEDB_SIZE; i++) { | |
451 | if (vesa_modes[i].xres == xres && | |
452 | vesa_modes[i].yres == yres && | |
453 | vesa_modes[i].refresh == refresh) { | |
454 | *mode = vesa_modes[i]; | |
455 | mode->flag |= FB_MODE_IS_STANDARD; | |
456 | return 1; | |
457 | } | |
458 | } | |
459 | calc_mode_timings(xres, yres, refresh, mode); | |
460 | return 1; | |
461 | } | |
462 | ||
463 | static int get_dst_timing(unsigned char *block, | |
464 | struct fb_videomode *mode) | |
465 | { | |
466 | int j, num = 0; | |
467 | ||
468 | for (j = 0; j < 6; j++, block+= STD_TIMING_DESCRIPTION_SIZE) | |
469 | num += get_std_timing(block, &mode[num]); | |
470 | ||
471 | return num; | |
472 | } | |
473 | ||
474 | static void get_detailed_timing(unsigned char *block, | |
475 | struct fb_videomode *mode) | |
476 | { | |
477 | mode->xres = H_ACTIVE; | |
478 | mode->yres = V_ACTIVE; | |
479 | mode->pixclock = PIXEL_CLOCK; | |
480 | mode->pixclock /= 1000; | |
481 | mode->pixclock = KHZ2PICOS(mode->pixclock); | |
482 | mode->right_margin = H_SYNC_OFFSET; | |
483 | mode->left_margin = (H_ACTIVE + H_BLANKING) - | |
484 | (H_ACTIVE + H_SYNC_OFFSET + H_SYNC_WIDTH); | |
485 | mode->upper_margin = V_BLANKING - V_SYNC_OFFSET - | |
486 | V_SYNC_WIDTH; | |
487 | mode->lower_margin = V_SYNC_OFFSET; | |
488 | mode->hsync_len = H_SYNC_WIDTH; | |
489 | mode->vsync_len = V_SYNC_WIDTH; | |
490 | if (HSYNC_POSITIVE) | |
491 | mode->sync |= FB_SYNC_HOR_HIGH_ACT; | |
492 | if (VSYNC_POSITIVE) | |
493 | mode->sync |= FB_SYNC_VERT_HIGH_ACT; | |
494 | mode->refresh = PIXEL_CLOCK/((H_ACTIVE + H_BLANKING) * | |
495 | (V_ACTIVE + V_BLANKING)); | |
496 | mode->vmode = 0; | |
497 | mode->flag = FB_MODE_IS_DETAILED; | |
498 | ||
499 | DPRINTK(" %d MHz ", PIXEL_CLOCK/1000000); | |
500 | DPRINTK("%d %d %d %d ", H_ACTIVE, H_ACTIVE + H_SYNC_OFFSET, | |
501 | H_ACTIVE + H_SYNC_OFFSET + H_SYNC_WIDTH, H_ACTIVE + H_BLANKING); | |
502 | DPRINTK("%d %d %d %d ", V_ACTIVE, V_ACTIVE + V_SYNC_OFFSET, | |
503 | V_ACTIVE + V_SYNC_OFFSET + V_SYNC_WIDTH, V_ACTIVE + V_BLANKING); | |
504 | DPRINTK("%sHSync %sVSync\n\n", (HSYNC_POSITIVE) ? "+" : "-", | |
505 | (VSYNC_POSITIVE) ? "+" : "-"); | |
506 | } | |
507 | ||
508 | /** | |
509 | * fb_create_modedb - create video mode database | |
510 | * @edid: EDID data | |
511 | * @dbsize: database size | |
512 | * | |
513 | * RETURNS: struct fb_videomode, @dbsize contains length of database | |
514 | * | |
515 | * DESCRIPTION: | |
516 | * This function builds a mode database using the contents of the EDID | |
517 | * data | |
518 | */ | |
519 | static struct fb_videomode *fb_create_modedb(unsigned char *edid, int *dbsize) | |
520 | { | |
521 | struct fb_videomode *mode, *m; | |
522 | unsigned char *block; | |
523 | int num = 0, i; | |
524 | ||
525 | mode = kmalloc(50 * sizeof(struct fb_videomode), GFP_KERNEL); | |
526 | if (mode == NULL) | |
527 | return NULL; | |
528 | memset(mode, 0, 50 * sizeof(struct fb_videomode)); | |
529 | ||
530 | if (edid == NULL || !edid_checksum(edid) || | |
531 | !edid_check_header(edid)) { | |
532 | kfree(mode); | |
533 | return NULL; | |
534 | } | |
535 | ||
536 | *dbsize = 0; | |
537 | ||
538 | DPRINTK(" Supported VESA Modes\n"); | |
539 | block = edid + ESTABLISHED_TIMING_1; | |
540 | num += get_est_timing(block, &mode[num]); | |
541 | ||
542 | DPRINTK(" Standard Timings\n"); | |
543 | block = edid + STD_TIMING_DESCRIPTIONS_START; | |
544 | for (i = 0; i < STD_TIMING; i++, block += STD_TIMING_DESCRIPTION_SIZE) | |
545 | num += get_std_timing(block, &mode[num]); | |
546 | ||
547 | DPRINTK(" Detailed Timings\n"); | |
548 | block = edid + DETAILED_TIMING_DESCRIPTIONS_START; | |
549 | for (i = 0; i < 4; i++, block+= DETAILED_TIMING_DESCRIPTION_SIZE) { | |
550 | int first = 1; | |
551 | ||
552 | if (block[0] == 0x00 && block[1] == 0x00) { | |
553 | if (block[3] == 0xfa) { | |
554 | num += get_dst_timing(block + 5, &mode[num]); | |
555 | } | |
556 | } else { | |
557 | get_detailed_timing(block, &mode[num]); | |
558 | if (first) { | |
559 | mode[num].flag |= FB_MODE_IS_FIRST; | |
560 | first = 0; | |
561 | } | |
562 | num++; | |
563 | } | |
564 | } | |
565 | ||
566 | /* Yikes, EDID data is totally useless */ | |
567 | if (!num) { | |
568 | kfree(mode); | |
569 | return NULL; | |
570 | } | |
571 | ||
572 | *dbsize = num; | |
573 | m = kmalloc(num * sizeof(struct fb_videomode), GFP_KERNEL); | |
574 | if (!m) | |
575 | return mode; | |
576 | memmove(m, mode, num * sizeof(struct fb_videomode)); | |
577 | kfree(mode); | |
578 | return m; | |
579 | } | |
580 | ||
581 | /** | |
582 | * fb_destroy_modedb - destroys mode database | |
583 | * @modedb: mode database to destroy | |
584 | * | |
585 | * DESCRIPTION: | |
586 | * Destroy mode database created by fb_create_modedb | |
587 | */ | |
588 | void fb_destroy_modedb(struct fb_videomode *modedb) | |
589 | { | |
590 | kfree(modedb); | |
591 | } | |
592 | ||
593 | static int fb_get_monitor_limits(unsigned char *edid, struct fb_monspecs *specs) | |
594 | { | |
595 | int i, retval = 1; | |
596 | unsigned char *block; | |
597 | ||
598 | block = edid + DETAILED_TIMING_DESCRIPTIONS_START; | |
599 | ||
600 | DPRINTK(" Monitor Operating Limits: "); | |
601 | for (i = 0; i < 4; i++, block += DETAILED_TIMING_DESCRIPTION_SIZE) { | |
602 | if (edid_is_limits_block(block)) { | |
603 | specs->hfmin = H_MIN_RATE * 1000; | |
604 | specs->hfmax = H_MAX_RATE * 1000; | |
605 | specs->vfmin = V_MIN_RATE; | |
606 | specs->vfmax = V_MAX_RATE; | |
607 | specs->dclkmax = MAX_PIXEL_CLOCK * 1000000; | |
608 | specs->gtf = (GTF_SUPPORT) ? 1 : 0; | |
609 | retval = 0; | |
610 | DPRINTK("From EDID\n"); | |
611 | break; | |
612 | } | |
613 | } | |
614 | ||
615 | /* estimate monitor limits based on modes supported */ | |
616 | if (retval) { | |
617 | struct fb_videomode *modes; | |
618 | int num_modes, i, hz, hscan, pixclock; | |
619 | ||
620 | modes = fb_create_modedb(edid, &num_modes); | |
621 | if (!modes) { | |
622 | DPRINTK("None Available\n"); | |
623 | return 1; | |
624 | } | |
625 | ||
626 | retval = 0; | |
627 | for (i = 0; i < num_modes; i++) { | |
628 | hz = modes[i].refresh; | |
629 | pixclock = PICOS2KHZ(modes[i].pixclock) * 1000; | |
630 | hscan = (modes[i].yres * 105 * hz + 5000)/100; | |
631 | ||
632 | if (specs->dclkmax == 0 || specs->dclkmax < pixclock) | |
633 | specs->dclkmax = pixclock; | |
634 | if (specs->dclkmin == 0 || specs->dclkmin > pixclock) | |
635 | specs->dclkmin = pixclock; | |
636 | if (specs->hfmax == 0 || specs->hfmax < hscan) | |
637 | specs->hfmax = hscan; | |
638 | if (specs->hfmin == 0 || specs->hfmin > hscan) | |
639 | specs->hfmin = hscan; | |
640 | if (specs->vfmax == 0 || specs->vfmax < hz) | |
641 | specs->vfmax = hz; | |
642 | if (specs->vfmin == 0 || specs->vfmin > hz) | |
643 | specs->vfmin = hz; | |
644 | } | |
645 | DPRINTK("Extrapolated\n"); | |
646 | fb_destroy_modedb(modes); | |
647 | } | |
648 | DPRINTK(" H: %d-%dKHz V: %d-%dHz DCLK: %dMHz\n", | |
649 | specs->hfmin/1000, specs->hfmax/1000, specs->vfmin, | |
650 | specs->vfmax, specs->dclkmax/1000000); | |
651 | return retval; | |
652 | } | |
653 | ||
654 | static void get_monspecs(unsigned char *edid, struct fb_monspecs *specs) | |
655 | { | |
656 | unsigned char c, *block; | |
657 | ||
658 | block = edid + EDID_STRUCT_DISPLAY; | |
659 | ||
660 | fb_get_monitor_limits(edid, specs); | |
661 | ||
662 | c = block[0] & 0x80; | |
663 | specs->input = 0; | |
664 | if (c) { | |
665 | specs->input |= FB_DISP_DDI; | |
666 | DPRINTK(" Digital Display Input"); | |
667 | } else { | |
668 | DPRINTK(" Analog Display Input: Input Voltage - "); | |
669 | switch ((block[0] & 0x60) >> 5) { | |
670 | case 0: | |
671 | DPRINTK("0.700V/0.300V"); | |
672 | specs->input |= FB_DISP_ANA_700_300; | |
673 | break; | |
674 | case 1: | |
675 | DPRINTK("0.714V/0.286V"); | |
676 | specs->input |= FB_DISP_ANA_714_286; | |
677 | break; | |
678 | case 2: | |
679 | DPRINTK("1.000V/0.400V"); | |
680 | specs->input |= FB_DISP_ANA_1000_400; | |
681 | break; | |
682 | case 3: | |
683 | DPRINTK("0.700V/0.000V"); | |
684 | specs->input |= FB_DISP_ANA_700_000; | |
685 | break; | |
686 | } | |
687 | } | |
688 | DPRINTK("\n Sync: "); | |
689 | c = block[0] & 0x10; | |
690 | if (c) | |
691 | DPRINTK(" Configurable signal level\n"); | |
692 | c = block[0] & 0x0f; | |
693 | specs->signal = 0; | |
694 | if (c & 0x10) { | |
695 | DPRINTK("Blank to Blank "); | |
696 | specs->signal |= FB_SIGNAL_BLANK_BLANK; | |
697 | } | |
698 | if (c & 0x08) { | |
699 | DPRINTK("Separate "); | |
700 | specs->signal |= FB_SIGNAL_SEPARATE; | |
701 | } | |
702 | if (c & 0x04) { | |
703 | DPRINTK("Composite "); | |
704 | specs->signal |= FB_SIGNAL_COMPOSITE; | |
705 | } | |
706 | if (c & 0x02) { | |
707 | DPRINTK("Sync on Green "); | |
708 | specs->signal |= FB_SIGNAL_SYNC_ON_GREEN; | |
709 | } | |
710 | if (c & 0x01) { | |
711 | DPRINTK("Serration on "); | |
712 | specs->signal |= FB_SIGNAL_SERRATION_ON; | |
713 | } | |
714 | DPRINTK("\n"); | |
715 | specs->max_x = block[1]; | |
716 | specs->max_y = block[2]; | |
717 | DPRINTK(" Max H-size in cm: "); | |
718 | if (specs->max_x) | |
719 | DPRINTK("%d\n", specs->max_x); | |
720 | else | |
721 | DPRINTK("variable\n"); | |
722 | DPRINTK(" Max V-size in cm: "); | |
723 | if (specs->max_y) | |
724 | DPRINTK("%d\n", specs->max_y); | |
725 | else | |
726 | DPRINTK("variable\n"); | |
727 | ||
728 | c = block[3]; | |
729 | specs->gamma = c+100; | |
730 | DPRINTK(" Gamma: "); | |
731 | DPRINTK("%d.%d\n", specs->gamma/100, specs->gamma % 100); | |
732 | ||
733 | get_dpms_capabilities(block[4], specs); | |
734 | ||
735 | switch ((block[4] & 0x18) >> 3) { | |
736 | case 0: | |
737 | DPRINTK(" Monochrome/Grayscale\n"); | |
738 | specs->input |= FB_DISP_MONO; | |
739 | break; | |
740 | case 1: | |
741 | DPRINTK(" RGB Color Display\n"); | |
742 | specs->input |= FB_DISP_RGB; | |
743 | break; | |
744 | case 2: | |
745 | DPRINTK(" Non-RGB Multicolor Display\n"); | |
746 | specs->input |= FB_DISP_MULTI; | |
747 | break; | |
748 | default: | |
749 | DPRINTK(" Unknown\n"); | |
750 | specs->input |= FB_DISP_UNKNOWN; | |
751 | break; | |
752 | } | |
753 | ||
754 | get_chroma(block, specs); | |
755 | ||
756 | specs->misc = 0; | |
757 | c = block[4] & 0x7; | |
758 | if (c & 0x04) { | |
759 | DPRINTK(" Default color format is primary\n"); | |
760 | specs->misc |= FB_MISC_PRIM_COLOR; | |
761 | } | |
762 | if (c & 0x02) { | |
763 | DPRINTK(" First DETAILED Timing is preferred\n"); | |
764 | specs->misc |= FB_MISC_1ST_DETAIL; | |
765 | } | |
766 | if (c & 0x01) { | |
767 | printk(" Display is GTF capable\n"); | |
768 | specs->gtf = 1; | |
769 | } | |
770 | } | |
771 | ||
772 | static int edid_is_timing_block(unsigned char *block) | |
773 | { | |
774 | if ((block[0] != 0x00) || (block[1] != 0x00) || | |
775 | (block[2] != 0x00) || (block[4] != 0x00)) | |
776 | return 1; | |
777 | else | |
778 | return 0; | |
779 | } | |
780 | ||
781 | int fb_parse_edid(unsigned char *edid, struct fb_var_screeninfo *var) | |
782 | { | |
783 | int i; | |
784 | unsigned char *block; | |
785 | ||
786 | if (edid == NULL || var == NULL) | |
787 | return 1; | |
788 | ||
789 | if (!(edid_checksum(edid))) | |
790 | return 1; | |
791 | ||
792 | if (!(edid_check_header(edid))) | |
793 | return 1; | |
794 | ||
795 | block = edid + DETAILED_TIMING_DESCRIPTIONS_START; | |
796 | ||
797 | for (i = 0; i < 4; i++, block += DETAILED_TIMING_DESCRIPTION_SIZE) { | |
798 | if (edid_is_timing_block(block)) { | |
799 | var->xres = var->xres_virtual = H_ACTIVE; | |
800 | var->yres = var->yres_virtual = V_ACTIVE; | |
801 | var->height = var->width = -1; | |
802 | var->right_margin = H_SYNC_OFFSET; | |
803 | var->left_margin = (H_ACTIVE + H_BLANKING) - | |
804 | (H_ACTIVE + H_SYNC_OFFSET + H_SYNC_WIDTH); | |
805 | var->upper_margin = V_BLANKING - V_SYNC_OFFSET - | |
806 | V_SYNC_WIDTH; | |
807 | var->lower_margin = V_SYNC_OFFSET; | |
808 | var->hsync_len = H_SYNC_WIDTH; | |
809 | var->vsync_len = V_SYNC_WIDTH; | |
810 | var->pixclock = PIXEL_CLOCK; | |
811 | var->pixclock /= 1000; | |
812 | var->pixclock = KHZ2PICOS(var->pixclock); | |
813 | ||
814 | if (HSYNC_POSITIVE) | |
815 | var->sync |= FB_SYNC_HOR_HIGH_ACT; | |
816 | if (VSYNC_POSITIVE) | |
817 | var->sync |= FB_SYNC_VERT_HIGH_ACT; | |
818 | return 0; | |
819 | } | |
820 | } | |
821 | return 1; | |
822 | } | |
823 | ||
824 | void fb_edid_to_monspecs(unsigned char *edid, struct fb_monspecs *specs) | |
825 | { | |
826 | unsigned char *block; | |
827 | int i; | |
828 | ||
829 | if (edid == NULL) | |
830 | return; | |
831 | ||
832 | if (!(edid_checksum(edid))) | |
833 | return; | |
834 | ||
835 | if (!(edid_check_header(edid))) | |
836 | return; | |
837 | ||
838 | memset(specs, 0, sizeof(struct fb_monspecs)); | |
839 | ||
840 | specs->version = edid[EDID_STRUCT_VERSION]; | |
841 | specs->revision = edid[EDID_STRUCT_REVISION]; | |
842 | ||
843 | DPRINTK("========================================\n"); | |
844 | DPRINTK("Display Information (EDID)\n"); | |
845 | DPRINTK("========================================\n"); | |
846 | DPRINTK(" EDID Version %d.%d\n", (int) specs->version, | |
847 | (int) specs->revision); | |
848 | ||
849 | parse_vendor_block(edid + ID_MANUFACTURER_NAME, specs); | |
850 | ||
851 | block = edid + DETAILED_TIMING_DESCRIPTIONS_START; | |
852 | for (i = 0; i < 4; i++, block += DETAILED_TIMING_DESCRIPTION_SIZE) { | |
853 | if (edid_is_serial_block(block)) { | |
854 | copy_string(block, specs->serial_no); | |
855 | DPRINTK(" Serial Number: %s\n", specs->serial_no); | |
856 | } else if (edid_is_ascii_block(block)) { | |
857 | copy_string(block, specs->ascii); | |
858 | DPRINTK(" ASCII Block: %s\n", specs->ascii); | |
859 | } else if (edid_is_monitor_block(block)) { | |
860 | copy_string(block, specs->monitor); | |
861 | DPRINTK(" Monitor Name: %s\n", specs->monitor); | |
862 | } | |
863 | } | |
864 | ||
865 | DPRINTK(" Display Characteristics:\n"); | |
866 | get_monspecs(edid, specs); | |
867 | ||
868 | specs->modedb = fb_create_modedb(edid, &specs->modedb_len); | |
869 | DPRINTK("========================================\n"); | |
870 | } | |
871 | ||
872 | /* | |
873 | * VESA Generalized Timing Formula (GTF) | |
874 | */ | |
875 | ||
876 | #define FLYBACK 550 | |
877 | #define V_FRONTPORCH 1 | |
878 | #define H_OFFSET 40 | |
879 | #define H_SCALEFACTOR 20 | |
880 | #define H_BLANKSCALE 128 | |
881 | #define H_GRADIENT 600 | |
882 | #define C_VAL 30 | |
883 | #define M_VAL 300 | |
884 | ||
885 | struct __fb_timings { | |
886 | u32 dclk; | |
887 | u32 hfreq; | |
888 | u32 vfreq; | |
889 | u32 hactive; | |
890 | u32 vactive; | |
891 | u32 hblank; | |
892 | u32 vblank; | |
893 | u32 htotal; | |
894 | u32 vtotal; | |
895 | }; | |
896 | ||
897 | /** | |
898 | * fb_get_vblank - get vertical blank time | |
899 | * @hfreq: horizontal freq | |
900 | * | |
901 | * DESCRIPTION: | |
902 | * vblank = right_margin + vsync_len + left_margin | |
903 | * | |
904 | * given: right_margin = 1 (V_FRONTPORCH) | |
905 | * vsync_len = 3 | |
906 | * flyback = 550 | |
907 | * | |
908 | * flyback * hfreq | |
909 | * left_margin = --------------- - vsync_len | |
910 | * 1000000 | |
911 | */ | |
912 | static u32 fb_get_vblank(u32 hfreq) | |
913 | { | |
914 | u32 vblank; | |
915 | ||
916 | vblank = (hfreq * FLYBACK)/1000; | |
917 | vblank = (vblank + 500)/1000; | |
918 | return (vblank + V_FRONTPORCH); | |
919 | } | |
920 | ||
921 | /** | |
922 | * fb_get_hblank_by_freq - get horizontal blank time given hfreq | |
923 | * @hfreq: horizontal freq | |
924 | * @xres: horizontal resolution in pixels | |
925 | * | |
926 | * DESCRIPTION: | |
927 | * | |
928 | * xres * duty_cycle | |
929 | * hblank = ------------------ | |
930 | * 100 - duty_cycle | |
931 | * | |
932 | * duty cycle = percent of htotal assigned to inactive display | |
933 | * duty cycle = C - (M/Hfreq) | |
934 | * | |
935 | * where: C = ((offset - scale factor) * blank_scale) | |
936 | * -------------------------------------- + scale factor | |
937 | * 256 | |
938 | * M = blank_scale * gradient | |
939 | * | |
940 | */ | |
941 | static u32 fb_get_hblank_by_hfreq(u32 hfreq, u32 xres) | |
942 | { | |
943 | u32 c_val, m_val, duty_cycle, hblank; | |
944 | ||
945 | c_val = (((H_OFFSET - H_SCALEFACTOR) * H_BLANKSCALE)/256 + | |
946 | H_SCALEFACTOR) * 1000; | |
947 | m_val = (H_BLANKSCALE * H_GRADIENT)/256; | |
948 | m_val = (m_val * 1000000)/hfreq; | |
949 | duty_cycle = c_val - m_val; | |
950 | hblank = (xres * duty_cycle)/(100000 - duty_cycle); | |
951 | return (hblank); | |
952 | } | |
953 | ||
954 | /** | |
955 | * fb_get_hblank_by_dclk - get horizontal blank time given pixelclock | |
956 | * @dclk: pixelclock in Hz | |
957 | * @xres: horizontal resolution in pixels | |
958 | * | |
959 | * DESCRIPTION: | |
960 | * | |
961 | * xres * duty_cycle | |
962 | * hblank = ------------------ | |
963 | * 100 - duty_cycle | |
964 | * | |
965 | * duty cycle = percent of htotal assigned to inactive display | |
966 | * duty cycle = C - (M * h_period) | |
967 | * | |
968 | * where: h_period = SQRT(100 - C + (0.4 * xres * M)/dclk) + C - 100 | |
969 | * ----------------------------------------------- | |
970 | * 2 * M | |
971 | * M = 300; | |
972 | * C = 30; | |
973 | ||
974 | */ | |
975 | static u32 fb_get_hblank_by_dclk(u32 dclk, u32 xres) | |
976 | { | |
977 | u32 duty_cycle, h_period, hblank; | |
978 | ||
979 | dclk /= 1000; | |
980 | h_period = 100 - C_VAL; | |
981 | h_period *= h_period; | |
982 | h_period += (M_VAL * xres * 2 * 1000)/(5 * dclk); | |
983 | h_period *=10000; | |
984 | ||
985 | h_period = int_sqrt(h_period); | |
986 | h_period -= (100 - C_VAL) * 100; | |
987 | h_period *= 1000; | |
988 | h_period /= 2 * M_VAL; | |
989 | ||
990 | duty_cycle = C_VAL * 1000 - (M_VAL * h_period)/100; | |
991 | hblank = (xres * duty_cycle)/(100000 - duty_cycle) + 8; | |
992 | hblank &= ~15; | |
993 | return (hblank); | |
994 | } | |
995 | ||
996 | /** | |
997 | * fb_get_hfreq - estimate hsync | |
998 | * @vfreq: vertical refresh rate | |
999 | * @yres: vertical resolution | |
1000 | * | |
1001 | * DESCRIPTION: | |
1002 | * | |
1003 | * (yres + front_port) * vfreq * 1000000 | |
1004 | * hfreq = ------------------------------------- | |
1005 | * (1000000 - (vfreq * FLYBACK) | |
1006 | * | |
1007 | */ | |
1008 | ||
1009 | static u32 fb_get_hfreq(u32 vfreq, u32 yres) | |
1010 | { | |
1011 | u32 divisor, hfreq; | |
1012 | ||
1013 | divisor = (1000000 - (vfreq * FLYBACK))/1000; | |
1014 | hfreq = (yres + V_FRONTPORCH) * vfreq * 1000; | |
1015 | return (hfreq/divisor); | |
1016 | } | |
1017 | ||
1018 | static void fb_timings_vfreq(struct __fb_timings *timings) | |
1019 | { | |
1020 | timings->hfreq = fb_get_hfreq(timings->vfreq, timings->vactive); | |
1021 | timings->vblank = fb_get_vblank(timings->hfreq); | |
1022 | timings->vtotal = timings->vactive + timings->vblank; | |
1023 | timings->hblank = fb_get_hblank_by_hfreq(timings->hfreq, | |
1024 | timings->hactive); | |
1025 | timings->htotal = timings->hactive + timings->hblank; | |
1026 | timings->dclk = timings->htotal * timings->hfreq; | |
1027 | } | |
1028 | ||
1029 | static void fb_timings_hfreq(struct __fb_timings *timings) | |
1030 | { | |
1031 | timings->vblank = fb_get_vblank(timings->hfreq); | |
1032 | timings->vtotal = timings->vactive + timings->vblank; | |
1033 | timings->vfreq = timings->hfreq/timings->vtotal; | |
1034 | timings->hblank = fb_get_hblank_by_hfreq(timings->hfreq, | |
1035 | timings->hactive); | |
1036 | timings->htotal = timings->hactive + timings->hblank; | |
1037 | timings->dclk = timings->htotal * timings->hfreq; | |
1038 | } | |
1039 | ||
1040 | static void fb_timings_dclk(struct __fb_timings *timings) | |
1041 | { | |
1042 | timings->hblank = fb_get_hblank_by_dclk(timings->dclk, | |
1043 | timings->hactive); | |
1044 | timings->htotal = timings->hactive + timings->hblank; | |
1045 | timings->hfreq = timings->dclk/timings->htotal; | |
1046 | timings->vblank = fb_get_vblank(timings->hfreq); | |
1047 | timings->vtotal = timings->vactive + timings->vblank; | |
1048 | timings->vfreq = timings->hfreq/timings->vtotal; | |
1049 | } | |
1050 | ||
1051 | /* | |
1052 | * fb_get_mode - calculates video mode using VESA GTF | |
1053 | * @flags: if: 0 - maximize vertical refresh rate | |
1054 | * 1 - vrefresh-driven calculation; | |
1055 | * 2 - hscan-driven calculation; | |
1056 | * 3 - pixelclock-driven calculation; | |
1057 | * @val: depending on @flags, ignored, vrefresh, hsync or pixelclock | |
1058 | * @var: pointer to fb_var_screeninfo | |
1059 | * @info: pointer to fb_info | |
1060 | * | |
1061 | * DESCRIPTION: | |
1062 | * Calculates video mode based on monitor specs using VESA GTF. | |
1063 | * The GTF is best for VESA GTF compliant monitors but is | |
1064 | * specifically formulated to work for older monitors as well. | |
1065 | * | |
1066 | * If @flag==0, the function will attempt to maximize the | |
1067 | * refresh rate. Otherwise, it will calculate timings based on | |
1068 | * the flag and accompanying value. | |
1069 | * | |
1070 | * If FB_IGNOREMON bit is set in @flags, monitor specs will be | |
1071 | * ignored and @var will be filled with the calculated timings. | |
1072 | * | |
1073 | * All calculations are based on the VESA GTF Spreadsheet | |
1074 | * available at VESA's public ftp (http://www.vesa.org). | |
1075 | * | |
1076 | * NOTES: | |
1077 | * The timings generated by the GTF will be different from VESA | |
1078 | * DMT. It might be a good idea to keep a table of standard | |
1079 | * VESA modes as well. The GTF may also not work for some displays, | |
1080 | * such as, and especially, analog TV. | |
1081 | * | |
1082 | * REQUIRES: | |
1083 | * A valid info->monspecs, otherwise 'safe numbers' will be used. | |
1084 | */ | |
1085 | int fb_get_mode(int flags, u32 val, struct fb_var_screeninfo *var, struct fb_info *info) | |
1086 | { | |
1087 | struct __fb_timings timings; | |
1088 | u32 interlace = 1, dscan = 1; | |
1089 | u32 hfmin, hfmax, vfmin, vfmax, dclkmin, dclkmax; | |
1090 | ||
1091 | /* | |
1092 | * If monspecs are invalid, use values that are enough | |
1093 | * for 640x480@60 | |
1094 | */ | |
1095 | if (!info->monspecs.hfmax || !info->monspecs.vfmax || | |
1096 | !info->monspecs.dclkmax || | |
1097 | info->monspecs.hfmax < info->monspecs.hfmin || | |
1098 | info->monspecs.vfmax < info->monspecs.vfmin || | |
1099 | info->monspecs.dclkmax < info->monspecs.dclkmin) { | |
1100 | hfmin = 29000; hfmax = 30000; | |
1101 | vfmin = 60; vfmax = 60; | |
1102 | dclkmin = 0; dclkmax = 25000000; | |
1103 | } else { | |
1104 | hfmin = info->monspecs.hfmin; | |
1105 | hfmax = info->monspecs.hfmax; | |
1106 | vfmin = info->monspecs.vfmin; | |
1107 | vfmax = info->monspecs.vfmax; | |
1108 | dclkmin = info->monspecs.dclkmin; | |
1109 | dclkmax = info->monspecs.dclkmax; | |
1110 | } | |
1111 | ||
1112 | memset(&timings, 0, sizeof(struct __fb_timings)); | |
1113 | timings.hactive = var->xres; | |
1114 | timings.vactive = var->yres; | |
1115 | if (var->vmode & FB_VMODE_INTERLACED) { | |
1116 | timings.vactive /= 2; | |
1117 | interlace = 2; | |
1118 | } | |
1119 | if (var->vmode & FB_VMODE_DOUBLE) { | |
1120 | timings.vactive *= 2; | |
1121 | dscan = 2; | |
1122 | } | |
1123 | ||
1124 | switch (flags & ~FB_IGNOREMON) { | |
1125 | case FB_MAXTIMINGS: /* maximize refresh rate */ | |
1126 | timings.hfreq = hfmax; | |
1127 | fb_timings_hfreq(&timings); | |
1128 | if (timings.vfreq > vfmax) { | |
1129 | timings.vfreq = vfmax; | |
1130 | fb_timings_vfreq(&timings); | |
1131 | } | |
1132 | if (timings.dclk > dclkmax) { | |
1133 | timings.dclk = dclkmax; | |
1134 | fb_timings_dclk(&timings); | |
1135 | } | |
1136 | break; | |
1137 | case FB_VSYNCTIMINGS: /* vrefresh driven */ | |
1138 | timings.vfreq = val; | |
1139 | fb_timings_vfreq(&timings); | |
1140 | break; | |
1141 | case FB_HSYNCTIMINGS: /* hsync driven */ | |
1142 | timings.hfreq = val; | |
1143 | fb_timings_hfreq(&timings); | |
1144 | break; | |
1145 | case FB_DCLKTIMINGS: /* pixelclock driven */ | |
1146 | timings.dclk = PICOS2KHZ(val) * 1000; | |
1147 | fb_timings_dclk(&timings); | |
1148 | break; | |
1149 | default: | |
1150 | return -EINVAL; | |
1151 | ||
1152 | } | |
1153 | ||
1154 | if (!(flags & FB_IGNOREMON) && | |
1155 | (timings.vfreq < vfmin || timings.vfreq > vfmax || | |
1156 | timings.hfreq < hfmin || timings.hfreq > hfmax || | |
1157 | timings.dclk < dclkmin || timings.dclk > dclkmax)) | |
1158 | return -EINVAL; | |
1159 | ||
1160 | var->pixclock = KHZ2PICOS(timings.dclk/1000); | |
1161 | var->hsync_len = (timings.htotal * 8)/100; | |
1162 | var->right_margin = (timings.hblank/2) - var->hsync_len; | |
1163 | var->left_margin = timings.hblank - var->right_margin - var->hsync_len; | |
1164 | ||
1165 | var->vsync_len = (3 * interlace)/dscan; | |
1166 | var->lower_margin = (1 * interlace)/dscan; | |
1167 | var->upper_margin = (timings.vblank * interlace)/dscan - | |
1168 | (var->vsync_len + var->lower_margin); | |
1169 | ||
1170 | return 0; | |
1171 | } | |
1172 | #else | |
1173 | int fb_parse_edid(unsigned char *edid, struct fb_var_screeninfo *var) | |
1174 | { | |
1175 | return 1; | |
1176 | } | |
1177 | void fb_edid_to_monspecs(unsigned char *edid, struct fb_monspecs *specs) | |
1178 | { | |
1179 | specs = NULL; | |
1180 | } | |
1181 | void fb_destroy_modedb(struct fb_videomode *modedb) | |
1182 | { | |
1183 | } | |
1184 | int fb_get_mode(int flags, u32 val, struct fb_var_screeninfo *var, | |
1185 | struct fb_info *info) | |
1186 | { | |
1187 | return -EINVAL; | |
1188 | } | |
1189 | #endif /* CONFIG_FB_MODE_HELPERS */ | |
1190 | ||
1191 | /* | |
1192 | * fb_validate_mode - validates var against monitor capabilities | |
1193 | * @var: pointer to fb_var_screeninfo | |
1194 | * @info: pointer to fb_info | |
1195 | * | |
1196 | * DESCRIPTION: | |
1197 | * Validates video mode against monitor capabilities specified in | |
1198 | * info->monspecs. | |
1199 | * | |
1200 | * REQUIRES: | |
1201 | * A valid info->monspecs. | |
1202 | */ | |
1203 | int fb_validate_mode(const struct fb_var_screeninfo *var, struct fb_info *info) | |
1204 | { | |
1205 | u32 hfreq, vfreq, htotal, vtotal, pixclock; | |
1206 | u32 hfmin, hfmax, vfmin, vfmax, dclkmin, dclkmax; | |
1207 | ||
1208 | /* | |
1209 | * If monspecs are invalid, use values that are enough | |
1210 | * for 640x480@60 | |
1211 | */ | |
1212 | if (!info->monspecs.hfmax || !info->monspecs.vfmax || | |
1213 | !info->monspecs.dclkmax || | |
1214 | info->monspecs.hfmax < info->monspecs.hfmin || | |
1215 | info->monspecs.vfmax < info->monspecs.vfmin || | |
1216 | info->monspecs.dclkmax < info->monspecs.dclkmin) { | |
1217 | hfmin = 29000; hfmax = 30000; | |
1218 | vfmin = 60; vfmax = 60; | |
1219 | dclkmin = 0; dclkmax = 25000000; | |
1220 | } else { | |
1221 | hfmin = info->monspecs.hfmin; | |
1222 | hfmax = info->monspecs.hfmax; | |
1223 | vfmin = info->monspecs.vfmin; | |
1224 | vfmax = info->monspecs.vfmax; | |
1225 | dclkmin = info->monspecs.dclkmin; | |
1226 | dclkmax = info->monspecs.dclkmax; | |
1227 | } | |
1228 | ||
1229 | if (!var->pixclock) | |
1230 | return -EINVAL; | |
1231 | pixclock = PICOS2KHZ(var->pixclock) * 1000; | |
1232 | ||
1233 | htotal = var->xres + var->right_margin + var->hsync_len + | |
1234 | var->left_margin; | |
1235 | vtotal = var->yres + var->lower_margin + var->vsync_len + | |
1236 | var->upper_margin; | |
1237 | ||
1238 | if (var->vmode & FB_VMODE_INTERLACED) | |
1239 | vtotal /= 2; | |
1240 | if (var->vmode & FB_VMODE_DOUBLE) | |
1241 | vtotal *= 2; | |
1242 | ||
1243 | hfreq = pixclock/htotal; | |
1244 | vfreq = hfreq/vtotal; | |
1245 | ||
1246 | return (vfreq < vfmin || vfreq > vfmax || | |
1247 | hfreq < hfmin || hfreq > hfmax || | |
1248 | pixclock < dclkmin || pixclock > dclkmax) ? | |
1249 | -EINVAL : 0; | |
1250 | } | |
1251 | ||
1252 | EXPORT_SYMBOL(fb_parse_edid); | |
1253 | EXPORT_SYMBOL(fb_edid_to_monspecs); | |
1254 | ||
1255 | EXPORT_SYMBOL(fb_get_mode); | |
1256 | EXPORT_SYMBOL(fb_validate_mode); | |
1257 | EXPORT_SYMBOL(fb_destroy_modedb); |