Commit | Line | Data |
---|---|---|
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> |
5a0e3ad6 | 32 | #include <linux/slab.h> |
5e518d76 | 33 | #include <video/edid.h> |
79089044 | 34 | #include <video/of_videomode.h> |
2db54c72 | 35 | #include <video/videomode.h> |
19757fc8 | 36 | #include "../edid.h" |
1da177e4 | 37 | |
8c85fd89 | 38 | /* |
1da177e4 LT |
39 | * EDID parser |
40 | */ | |
41 | ||
42 | #undef DEBUG /* define this for verbose EDID parsing output */ | |
43 | ||
44 | #ifdef DEBUG | |
45 | #define DPRINTK(fmt, args...) printk(fmt,## args) | |
46 | #else | |
47 | #define DPRINTK(fmt, args...) | |
48 | #endif | |
49 | ||
33a9f640 AD |
50 | #define FBMON_FIX_HEADER 1 |
51 | #define FBMON_FIX_INPUT 2 | |
52 | #define FBMON_FIX_TIMINGS 3 | |
1da177e4 LT |
53 | |
54 | #ifdef CONFIG_FB_MODE_HELPERS | |
55 | struct broken_edid { | |
56 | u8 manufacturer[4]; | |
57 | u32 model; | |
58 | u32 fix; | |
59 | }; | |
60 | ||
d95159cf | 61 | static const struct broken_edid brokendb[] = { |
1da177e4 LT |
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 | }, | |
33a9f640 AD |
74 | /* Sharp UXGA? */ |
75 | { | |
76 | .manufacturer = "SHP", | |
77 | .model = 0x138e, | |
78 | .fix = FBMON_FIX_TIMINGS, | |
79 | }, | |
1da177e4 LT |
80 | }; |
81 | ||
82 | static const unsigned char edid_v1_header[] = { 0x00, 0xff, 0xff, 0xff, | |
83 | 0xff, 0xff, 0xff, 0x00 | |
84 | }; | |
85 | ||
86 | static void copy_string(unsigned char *c, unsigned char *s) | |
87 | { | |
88 | int i; | |
89 | c = c + 5; | |
90 | for (i = 0; (i < 13 && *c != 0x0A); i++) | |
91 | *(s++) = *(c++); | |
92 | *s = 0; | |
93 | while (i-- && (*--s == 0x20)) *s = 0; | |
94 | } | |
95 | ||
33a9f640 AD |
96 | static int edid_is_serial_block(unsigned char *block) |
97 | { | |
98 | if ((block[0] == 0x00) && (block[1] == 0x00) && | |
99 | (block[2] == 0x00) && (block[3] == 0xff) && | |
100 | (block[4] == 0x00)) | |
101 | return 1; | |
102 | else | |
103 | return 0; | |
104 | } | |
105 | ||
106 | static int edid_is_ascii_block(unsigned char *block) | |
107 | { | |
108 | if ((block[0] == 0x00) && (block[1] == 0x00) && | |
109 | (block[2] == 0x00) && (block[3] == 0xfe) && | |
110 | (block[4] == 0x00)) | |
111 | return 1; | |
112 | else | |
113 | return 0; | |
114 | } | |
115 | ||
116 | static int edid_is_limits_block(unsigned char *block) | |
117 | { | |
118 | if ((block[0] == 0x00) && (block[1] == 0x00) && | |
119 | (block[2] == 0x00) && (block[3] == 0xfd) && | |
120 | (block[4] == 0x00)) | |
121 | return 1; | |
122 | else | |
123 | return 0; | |
124 | } | |
125 | ||
126 | static int edid_is_monitor_block(unsigned char *block) | |
127 | { | |
128 | if ((block[0] == 0x00) && (block[1] == 0x00) && | |
129 | (block[2] == 0x00) && (block[3] == 0xfc) && | |
130 | (block[4] == 0x00)) | |
131 | return 1; | |
132 | else | |
133 | return 0; | |
134 | } | |
135 | ||
136 | static int edid_is_timing_block(unsigned char *block) | |
137 | { | |
138 | if ((block[0] != 0x00) || (block[1] != 0x00) || | |
139 | (block[2] != 0x00) || (block[4] != 0x00)) | |
140 | return 1; | |
141 | else | |
142 | return 0; | |
143 | } | |
144 | ||
1da177e4 LT |
145 | static int check_edid(unsigned char *edid) |
146 | { | |
147 | unsigned char *block = edid + ID_MANUFACTURER_NAME, manufacturer[4]; | |
148 | unsigned char *b; | |
149 | u32 model; | |
150 | int i, fix = 0, ret = 0; | |
151 | ||
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) + '@'; | |
156 | manufacturer[3] = 0; | |
157 | model = block[2] + (block[3] << 8); | |
158 | ||
159 | for (i = 0; i < ARRAY_SIZE(brokendb); i++) { | |
160 | if (!strncmp(manufacturer, brokendb[i].manufacturer, 4) && | |
161 | brokendb[i].model == model) { | |
8c85fd89 AH |
162 | fix = brokendb[i].fix; |
163 | break; | |
1da177e4 LT |
164 | } |
165 | } | |
166 | ||
167 | switch (fix) { | |
168 | case FBMON_FIX_HEADER: | |
169 | for (i = 0; i < 8; i++) { | |
33a9f640 | 170 | if (edid[i] != edid_v1_header[i]) { |
1da177e4 | 171 | ret = fix; |
33a9f640 AD |
172 | break; |
173 | } | |
1da177e4 LT |
174 | } |
175 | break; | |
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) | |
181 | ret = fix; | |
182 | break; | |
33a9f640 AD |
183 | case FBMON_FIX_TIMINGS: |
184 | b = edid + DETAILED_TIMING_DESCRIPTIONS_START; | |
185 | ret = fix; | |
186 | ||
187 | for (i = 0; i < 4; i++) { | |
188 | if (edid_is_limits_block(b)) { | |
189 | ret = 0; | |
190 | break; | |
191 | } | |
192 | ||
193 | b += DETAILED_TIMING_DESCRIPTION_SIZE; | |
194 | } | |
195 | ||
196 | break; | |
1da177e4 LT |
197 | } |
198 | ||
33a9f640 AD |
199 | if (ret) |
200 | printk("fbmon: The EDID Block of " | |
201 | "Manufacturer: %s Model: 0x%x is known to " | |
202 | "be broken,\n", manufacturer, model); | |
203 | ||
1da177e4 LT |
204 | return ret; |
205 | } | |
206 | ||
207 | static void fix_edid(unsigned char *edid, int fix) | |
208 | { | |
33a9f640 AD |
209 | int i; |
210 | unsigned char *b, csum = 0; | |
1da177e4 LT |
211 | |
212 | switch (fix) { | |
213 | case FBMON_FIX_HEADER: | |
214 | printk("fbmon: trying a header reconstruct\n"); | |
215 | memcpy(edid, edid_v1_header, 8); | |
216 | break; | |
217 | case FBMON_FIX_INPUT: | |
218 | printk("fbmon: trying to fix input type\n"); | |
219 | b = edid + EDID_STRUCT_DISPLAY; | |
220 | b[0] &= ~0x80; | |
221 | edid[127] += 0x80; | |
33a9f640 AD |
222 | break; |
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))) { | |
231 | b[0] = 0x00; | |
232 | b[1] = 0x00; | |
233 | b[2] = 0x00; | |
234 | b[3] = 0xfd; | |
235 | b[4] = 0x00; | |
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*/ | |
241 | b[10] = 0; /* GTF */ | |
242 | break; | |
243 | } | |
244 | ||
245 | b += DETAILED_TIMING_DESCRIPTION_SIZE; | |
246 | } | |
247 | ||
248 | for (i = 0; i < EDID_LENGTH - 1; i++) | |
249 | csum += edid[i]; | |
250 | ||
251 | edid[127] = 256 - csum; | |
252 | break; | |
1da177e4 LT |
253 | } |
254 | } | |
255 | ||
256 | static int edid_checksum(unsigned char *edid) | |
257 | { | |
3730793d LT |
258 | unsigned char csum = 0, all_null = 0; |
259 | int i, err = 0, fix = check_edid(edid); | |
1da177e4 LT |
260 | |
261 | if (fix) | |
262 | fix_edid(edid, fix); | |
263 | ||
264 | for (i = 0; i < EDID_LENGTH; i++) { | |
265 | csum += edid[i]; | |
266 | all_null |= edid[i]; | |
267 | } | |
268 | ||
269 | if (csum == 0x00 && all_null) { | |
270 | /* checksum passed, everything's good */ | |
271 | err = 1; | |
272 | } | |
273 | ||
274 | return err; | |
275 | } | |
276 | ||
277 | static int edid_check_header(unsigned char *edid) | |
278 | { | |
279 | int i, err = 1, fix = check_edid(edid); | |
280 | ||
281 | if (fix) | |
282 | fix_edid(edid, fix); | |
283 | ||
284 | for (i = 0; i < 8; i++) { | |
285 | if (edid[i] != edid_v1_header[i]) | |
286 | err = 0; | |
287 | } | |
288 | ||
289 | return err; | |
290 | } | |
291 | ||
292 | static void parse_vendor_block(unsigned char *block, struct fb_monspecs *specs) | |
293 | { | |
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); | |
308 | } | |
309 | ||
310 | static void get_dpms_capabilities(unsigned char flags, | |
311 | struct fb_monspecs *specs) | |
312 | { | |
313 | specs->dpms = 0; | |
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"); | |
324 | } | |
8c85fd89 | 325 | |
1da177e4 LT |
326 | static void get_chroma(unsigned char *block, struct fb_monspecs *specs) |
327 | { | |
328 | int tmp; | |
329 | ||
330 | DPRINTK(" Chroma\n"); | |
331 | /* Chromaticity data */ | |
332 | tmp = ((block[5] & (3 << 6)) >> 6) | (block[0x7] << 2); | |
333 | tmp *= 1000; | |
334 | tmp += 512; | |
335 | specs->chroma.redx = tmp/1024; | |
336 | DPRINTK(" RedX: 0.%03d ", specs->chroma.redx); | |
337 | ||
338 | tmp = ((block[5] & (3 << 4)) >> 4) | (block[0x8] << 2); | |
339 | tmp *= 1000; | |
340 | tmp += 512; | |
341 | specs->chroma.redy = tmp/1024; | |
342 | DPRINTK("RedY: 0.%03d\n", specs->chroma.redy); | |
343 | ||
344 | tmp = ((block[5] & (3 << 2)) >> 2) | (block[0x9] << 2); | |
345 | tmp *= 1000; | |
346 | tmp += 512; | |
347 | specs->chroma.greenx = tmp/1024; | |
348 | DPRINTK(" GreenX: 0.%03d ", specs->chroma.greenx); | |
349 | ||
350 | tmp = (block[5] & 3) | (block[0xa] << 2); | |
351 | tmp *= 1000; | |
352 | tmp += 512; | |
353 | specs->chroma.greeny = tmp/1024; | |
354 | DPRINTK("GreenY: 0.%03d\n", specs->chroma.greeny); | |
355 | ||
356 | tmp = ((block[6] & (3 << 6)) >> 6) | (block[0xb] << 2); | |
357 | tmp *= 1000; | |
358 | tmp += 512; | |
359 | specs->chroma.bluex = tmp/1024; | |
360 | DPRINTK(" BlueX: 0.%03d ", specs->chroma.bluex); | |
361 | ||
362 | tmp = ((block[6] & (3 << 4)) >> 4) | (block[0xc] << 2); | |
363 | tmp *= 1000; | |
364 | tmp += 512; | |
365 | specs->chroma.bluey = tmp/1024; | |
366 | DPRINTK("BlueY: 0.%03d\n", specs->chroma.bluey); | |
8c85fd89 | 367 | |
1da177e4 LT |
368 | tmp = ((block[6] & (3 << 2)) >> 2) | (block[0xd] << 2); |
369 | tmp *= 1000; | |
370 | tmp += 512; | |
371 | specs->chroma.whitex = tmp/1024; | |
372 | DPRINTK(" WhiteX: 0.%03d ", specs->chroma.whitex); | |
373 | ||
374 | tmp = (block[6] & 3) | (block[0xe] << 2); | |
375 | tmp *= 1000; | |
376 | tmp += 512; | |
377 | specs->chroma.whitey = tmp/1024; | |
378 | DPRINTK("WhiteY: 0.%03d\n", specs->chroma.whitey); | |
379 | } | |
380 | ||
61ab7903 AD |
381 | static void calc_mode_timings(int xres, int yres, int refresh, |
382 | struct fb_videomode *mode) | |
1da177e4 | 383 | { |
af5d0f7e | 384 | struct fb_var_screeninfo *var; |
8c85fd89 | 385 | |
af5d0f7e AD |
386 | var = kzalloc(sizeof(struct fb_var_screeninfo), GFP_KERNEL); |
387 | ||
388 | if (var) { | |
389 | var->xres = xres; | |
390 | var->yres = yres; | |
391 | fb_get_mode(FB_VSYNCTIMINGS | FB_IGNOREMON, | |
392 | refresh, var, NULL); | |
393 | mode->xres = xres; | |
394 | mode->yres = yres; | |
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; | |
403 | mode->vmode = 0; | |
404 | mode->sync = 0; | |
405 | kfree(var); | |
406 | } | |
1da177e4 LT |
407 | } |
408 | ||
409 | static int get_est_timing(unsigned char *block, struct fb_videomode *mode) | |
410 | { | |
411 | int num = 0; | |
412 | unsigned char c; | |
413 | ||
414 | c = block[0]; | |
415 | if (c&0x80) { | |
416 | calc_mode_timings(720, 400, 70, &mode[num]); | |
417 | mode[num++].flag = FB_MODE_IS_CALCULATED; | |
418 | DPRINTK(" 720x400@70Hz\n"); | |
419 | } | |
420 | if (c&0x40) { | |
421 | calc_mode_timings(720, 400, 88, &mode[num]); | |
422 | mode[num++].flag = FB_MODE_IS_CALCULATED; | |
423 | DPRINTK(" 720x400@88Hz\n"); | |
424 | } | |
425 | if (c&0x20) { | |
426 | mode[num++] = vesa_modes[3]; | |
427 | DPRINTK(" 640x480@60Hz\n"); | |
428 | } | |
429 | if (c&0x10) { | |
430 | calc_mode_timings(640, 480, 67, &mode[num]); | |
431 | mode[num++].flag = FB_MODE_IS_CALCULATED; | |
432 | DPRINTK(" 640x480@67Hz\n"); | |
433 | } | |
434 | if (c&0x08) { | |
435 | mode[num++] = vesa_modes[4]; | |
436 | DPRINTK(" 640x480@72Hz\n"); | |
437 | } | |
438 | if (c&0x04) { | |
439 | mode[num++] = vesa_modes[5]; | |
440 | DPRINTK(" 640x480@75Hz\n"); | |
441 | } | |
442 | if (c&0x02) { | |
443 | mode[num++] = vesa_modes[7]; | |
444 | DPRINTK(" 800x600@56Hz\n"); | |
445 | } | |
446 | if (c&0x01) { | |
447 | mode[num++] = vesa_modes[8]; | |
448 | DPRINTK(" 800x600@60Hz\n"); | |
449 | } | |
450 | ||
451 | c = block[1]; | |
452 | if (c&0x80) { | |
8c85fd89 | 453 | mode[num++] = vesa_modes[9]; |
1da177e4 LT |
454 | DPRINTK(" 800x600@72Hz\n"); |
455 | } | |
456 | if (c&0x40) { | |
8c85fd89 | 457 | mode[num++] = vesa_modes[10]; |
1da177e4 LT |
458 | DPRINTK(" 800x600@75Hz\n"); |
459 | } | |
460 | if (c&0x20) { | |
461 | calc_mode_timings(832, 624, 75, &mode[num]); | |
462 | mode[num++].flag = FB_MODE_IS_CALCULATED; | |
463 | DPRINTK(" 832x624@75Hz\n"); | |
464 | } | |
465 | if (c&0x10) { | |
466 | mode[num++] = vesa_modes[12]; | |
467 | DPRINTK(" 1024x768@87Hz Interlaced\n"); | |
468 | } | |
469 | if (c&0x08) { | |
470 | mode[num++] = vesa_modes[13]; | |
471 | DPRINTK(" 1024x768@60Hz\n"); | |
472 | } | |
473 | if (c&0x04) { | |
474 | mode[num++] = vesa_modes[14]; | |
475 | DPRINTK(" 1024x768@70Hz\n"); | |
476 | } | |
477 | if (c&0x02) { | |
478 | mode[num++] = vesa_modes[15]; | |
479 | DPRINTK(" 1024x768@75Hz\n"); | |
480 | } | |
481 | if (c&0x01) { | |
482 | mode[num++] = vesa_modes[21]; | |
483 | DPRINTK(" 1280x1024@75Hz\n"); | |
484 | } | |
485 | c = block[2]; | |
486 | if (c&0x80) { | |
487 | mode[num++] = vesa_modes[17]; | |
488 | DPRINTK(" 1152x870@75Hz\n"); | |
489 | } | |
490 | DPRINTK(" Manufacturer's mask: %x\n",c&0x7F); | |
491 | return num; | |
492 | } | |
493 | ||
43dcd13b | 494 | static int get_std_timing(unsigned char *block, struct fb_videomode *mode, |
72bbf10b | 495 | int ver, int rev, const struct fb_monspecs *specs) |
1da177e4 | 496 | { |
8f5ee77b | 497 | int i; |
1da177e4 | 498 | |
8f5ee77b DU |
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) | |
502 | break; | |
1da177e4 | 503 | } |
8f5ee77b DU |
504 | |
505 | if (i < DMT_SIZE && dmt_modes[i].mode) { | |
506 | /* DMT mode found */ | |
507 | *mode = *dmt_modes[i].mode; | |
508 | mode->flag |= FB_MODE_IS_STANDARD; | |
509 | DPRINTK(" DMT id=%d\n", dmt_modes[i].dmt_id); | |
510 | ||
511 | } else { | |
512 | int xres, yres = 0, refresh, ratio; | |
513 | ||
514 | xres = (block[0] + 31) * 8; | |
515 | if (xres <= 256) | |
516 | return 0; | |
517 | ||
518 | ratio = (block[1] & 0xc0) >> 6; | |
519 | switch (ratio) { | |
520 | case 0: | |
521 | /* in EDID 1.3 the meaning of 0 changed to 16:10 (prior 1:1) */ | |
522 | if (ver < 1 || (ver == 1 && rev < 3)) | |
523 | yres = xres; | |
524 | else | |
525 | yres = (xres * 10)/16; | |
526 | break; | |
527 | case 1: | |
528 | yres = (xres * 3)/4; | |
529 | break; | |
530 | case 2: | |
531 | yres = (xres * 4)/5; | |
532 | break; | |
533 | case 3: | |
534 | yres = (xres * 9)/16; | |
535 | break; | |
1da177e4 | 536 | } |
8f5ee77b DU |
537 | refresh = (block[1] & 0x3f) + 60; |
538 | DPRINTK(" %dx%d@%dHz\n", xres, yres, refresh); | |
539 | ||
540 | calc_mode_timings(xres, yres, refresh, mode); | |
1da177e4 | 541 | } |
8f5ee77b | 542 | |
72bbf10b DU |
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"); | |
547 | return 0; | |
548 | } | |
549 | ||
1da177e4 LT |
550 | return 1; |
551 | } | |
552 | ||
72bbf10b DU |
553 | static int get_dst_timing(unsigned char *block, struct fb_videomode *mode, |
554 | int ver, int rev, const struct fb_monspecs *specs) | |
1da177e4 LT |
555 | { |
556 | int j, num = 0; | |
557 | ||
8c85fd89 | 558 | for (j = 0; j < 6; j++, block += STD_TIMING_DESCRIPTION_SIZE) |
72bbf10b | 559 | num += get_std_timing(block, &mode[num], ver, rev, specs); |
1da177e4 LT |
560 | |
561 | return num; | |
562 | } | |
563 | ||
8c85fd89 | 564 | static void get_detailed_timing(unsigned char *block, |
1da177e4 LT |
565 | struct fb_videomode *mode) |
566 | { | |
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); | |
8c85fd89 | 575 | mode->upper_margin = V_BLANKING - V_SYNC_OFFSET - |
1da177e4 LT |
576 | V_SYNC_WIDTH; |
577 | mode->lower_margin = V_SYNC_OFFSET; | |
578 | mode->hsync_len = H_SYNC_WIDTH; | |
579 | mode->vsync_len = V_SYNC_WIDTH; | |
580 | if (HSYNC_POSITIVE) | |
581 | mode->sync |= FB_SYNC_HOR_HIGH_ACT; | |
582 | if (VSYNC_POSITIVE) | |
583 | mode->sync |= FB_SYNC_VERT_HIGH_ACT; | |
584 | mode->refresh = PIXEL_CLOCK/((H_ACTIVE + H_BLANKING) * | |
585 | (V_ACTIVE + V_BLANKING)); | |
1a3b09dc JD |
586 | if (INTERLACED) { |
587 | mode->yres *= 2; | |
588 | mode->upper_margin *= 2; | |
589 | mode->lower_margin *= 2; | |
590 | mode->vsync_len *= 2; | |
591 | mode->vmode |= FB_VMODE_INTERLACED; | |
592 | } | |
1da177e4 LT |
593 | mode->flag = FB_MODE_IS_DETAILED; |
594 | ||
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) ? "+" : "-"); | |
602 | } | |
603 | ||
604 | /** | |
605 | * fb_create_modedb - create video mode database | |
606 | * @edid: EDID data | |
607 | * @dbsize: database size | |
608 | * | |
609 | * RETURNS: struct fb_videomode, @dbsize contains length of database | |
610 | * | |
611 | * DESCRIPTION: | |
612 | * This function builds a mode database using the contents of the EDID | |
613 | * data | |
614 | */ | |
72bbf10b DU |
615 | static struct fb_videomode *fb_create_modedb(unsigned char *edid, int *dbsize, |
616 | const struct fb_monspecs *specs) | |
1da177e4 LT |
617 | { |
618 | struct fb_videomode *mode, *m; | |
619 | unsigned char *block; | |
5a258d03 | 620 | int num = 0, i, first = 1; |
43dcd13b TV |
621 | int ver, rev; |
622 | ||
def1eded | 623 | mode = kzalloc(50 * sizeof(struct fb_videomode), GFP_KERNEL); |
1da177e4 LT |
624 | if (mode == NULL) |
625 | return NULL; | |
1da177e4 | 626 | |
8c85fd89 | 627 | if (edid == NULL || !edid_checksum(edid) || |
1da177e4 LT |
628 | !edid_check_header(edid)) { |
629 | kfree(mode); | |
630 | return NULL; | |
631 | } | |
632 | ||
d746b40c SM |
633 | ver = edid[EDID_STRUCT_VERSION]; |
634 | rev = edid[EDID_STRUCT_REVISION]; | |
635 | ||
1da177e4 LT |
636 | *dbsize = 0; |
637 | ||
1da177e4 LT |
638 | DPRINTK(" Detailed Timings\n"); |
639 | block = edid + DETAILED_TIMING_DESCRIPTIONS_START; | |
640 | for (i = 0; i < 4; i++, block+= DETAILED_TIMING_DESCRIPTION_SIZE) { | |
14c8102f | 641 | if (!(block[0] == 0x00 && block[1] == 0x00)) { |
1da177e4 LT |
642 | get_detailed_timing(block, &mode[num]); |
643 | if (first) { | |
644 | mode[num].flag |= FB_MODE_IS_FIRST; | |
645 | first = 0; | |
646 | } | |
647 | num++; | |
648 | } | |
649 | } | |
14c8102f AD |
650 | |
651 | DPRINTK(" Supported VESA Modes\n"); | |
652 | block = edid + ESTABLISHED_TIMING_1; | |
653 | num += get_est_timing(block, &mode[num]); | |
654 | ||
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) | |
72bbf10b | 658 | num += get_std_timing(block, &mode[num], ver, rev, specs); |
14c8102f AD |
659 | |
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) | |
72bbf10b DU |
663 | num += get_dst_timing(block + 5, &mode[num], |
664 | ver, rev, specs); | |
14c8102f | 665 | } |
8c85fd89 | 666 | |
1da177e4 LT |
667 | /* Yikes, EDID data is totally useless */ |
668 | if (!num) { | |
669 | kfree(mode); | |
670 | return NULL; | |
671 | } | |
672 | ||
673 | *dbsize = num; | |
674 | m = kmalloc(num * sizeof(struct fb_videomode), GFP_KERNEL); | |
675 | if (!m) | |
676 | return mode; | |
677 | memmove(m, mode, num * sizeof(struct fb_videomode)); | |
678 | kfree(mode); | |
679 | return m; | |
680 | } | |
681 | ||
682 | /** | |
683 | * fb_destroy_modedb - destroys mode database | |
684 | * @modedb: mode database to destroy | |
685 | * | |
686 | * DESCRIPTION: | |
687 | * Destroy mode database created by fb_create_modedb | |
688 | */ | |
689 | void fb_destroy_modedb(struct fb_videomode *modedb) | |
690 | { | |
691 | kfree(modedb); | |
692 | } | |
693 | ||
694 | static int fb_get_monitor_limits(unsigned char *edid, struct fb_monspecs *specs) | |
695 | { | |
696 | int i, retval = 1; | |
697 | unsigned char *block; | |
698 | ||
699 | block = edid + DETAILED_TIMING_DESCRIPTIONS_START; | |
700 | ||
701 | DPRINTK(" Monitor Operating Limits: "); | |
30076831 | 702 | |
1da177e4 LT |
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; | |
711 | retval = 0; | |
712 | DPRINTK("From EDID\n"); | |
713 | break; | |
714 | } | |
715 | } | |
30076831 | 716 | |
1da177e4 LT |
717 | /* estimate monitor limits based on modes supported */ |
718 | if (retval) { | |
30076831 | 719 | struct fb_videomode *modes, *mode; |
cb85063a | 720 | int num_modes, hz, hscan, pixclock; |
30076831 | 721 | int vtotal, htotal; |
1da177e4 | 722 | |
72bbf10b | 723 | modes = fb_create_modedb(edid, &num_modes, specs); |
1da177e4 LT |
724 | if (!modes) { |
725 | DPRINTK("None Available\n"); | |
726 | return 1; | |
727 | } | |
728 | ||
729 | retval = 0; | |
730 | for (i = 0; i < num_modes; i++) { | |
30076831 | 731 | mode = &modes[i]; |
1da177e4 | 732 | pixclock = PICOS2KHZ(modes[i].pixclock) * 1000; |
30076831 AD |
733 | htotal = mode->xres + mode->right_margin + mode->hsync_len |
734 | + mode->left_margin; | |
735 | vtotal = mode->yres + mode->lower_margin + mode->vsync_len | |
736 | + mode->upper_margin; | |
737 | ||
738 | if (mode->vmode & FB_VMODE_INTERLACED) | |
739 | vtotal /= 2; | |
740 | ||
741 | if (mode->vmode & FB_VMODE_DOUBLE) | |
742 | vtotal *= 2; | |
743 | ||
744 | hscan = (pixclock + htotal / 2) / htotal; | |
745 | hscan = (hscan + 500) / 1000 * 1000; | |
746 | hz = (hscan + vtotal / 2) / vtotal; | |
8c85fd89 | 747 | |
1da177e4 LT |
748 | if (specs->dclkmax == 0 || specs->dclkmax < pixclock) |
749 | specs->dclkmax = pixclock; | |
30076831 | 750 | |
1da177e4 LT |
751 | if (specs->dclkmin == 0 || specs->dclkmin > pixclock) |
752 | specs->dclkmin = pixclock; | |
30076831 | 753 | |
1da177e4 LT |
754 | if (specs->hfmax == 0 || specs->hfmax < hscan) |
755 | specs->hfmax = hscan; | |
30076831 | 756 | |
1da177e4 LT |
757 | if (specs->hfmin == 0 || specs->hfmin > hscan) |
758 | specs->hfmin = hscan; | |
30076831 | 759 | |
1da177e4 LT |
760 | if (specs->vfmax == 0 || specs->vfmax < hz) |
761 | specs->vfmax = hz; | |
30076831 | 762 | |
1da177e4 LT |
763 | if (specs->vfmin == 0 || specs->vfmin > hz) |
764 | specs->vfmin = hz; | |
765 | } | |
766 | DPRINTK("Extrapolated\n"); | |
767 | fb_destroy_modedb(modes); | |
768 | } | |
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); | |
772 | return retval; | |
773 | } | |
774 | ||
775 | static void get_monspecs(unsigned char *edid, struct fb_monspecs *specs) | |
776 | { | |
777 | unsigned char c, *block; | |
778 | ||
779 | block = edid + EDID_STRUCT_DISPLAY; | |
780 | ||
781 | fb_get_monitor_limits(edid, specs); | |
782 | ||
783 | c = block[0] & 0x80; | |
784 | specs->input = 0; | |
785 | if (c) { | |
786 | specs->input |= FB_DISP_DDI; | |
787 | DPRINTK(" Digital Display Input"); | |
788 | } else { | |
789 | DPRINTK(" Analog Display Input: Input Voltage - "); | |
790 | switch ((block[0] & 0x60) >> 5) { | |
791 | case 0: | |
792 | DPRINTK("0.700V/0.300V"); | |
793 | specs->input |= FB_DISP_ANA_700_300; | |
794 | break; | |
795 | case 1: | |
796 | DPRINTK("0.714V/0.286V"); | |
797 | specs->input |= FB_DISP_ANA_714_286; | |
798 | break; | |
799 | case 2: | |
800 | DPRINTK("1.000V/0.400V"); | |
801 | specs->input |= FB_DISP_ANA_1000_400; | |
802 | break; | |
803 | case 3: | |
804 | DPRINTK("0.700V/0.000V"); | |
805 | specs->input |= FB_DISP_ANA_700_000; | |
806 | break; | |
807 | } | |
808 | } | |
809 | DPRINTK("\n Sync: "); | |
810 | c = block[0] & 0x10; | |
811 | if (c) | |
812 | DPRINTK(" Configurable signal level\n"); | |
813 | c = block[0] & 0x0f; | |
814 | specs->signal = 0; | |
815 | if (c & 0x10) { | |
816 | DPRINTK("Blank to Blank "); | |
817 | specs->signal |= FB_SIGNAL_BLANK_BLANK; | |
818 | } | |
819 | if (c & 0x08) { | |
820 | DPRINTK("Separate "); | |
821 | specs->signal |= FB_SIGNAL_SEPARATE; | |
822 | } | |
823 | if (c & 0x04) { | |
824 | DPRINTK("Composite "); | |
825 | specs->signal |= FB_SIGNAL_COMPOSITE; | |
826 | } | |
827 | if (c & 0x02) { | |
828 | DPRINTK("Sync on Green "); | |
829 | specs->signal |= FB_SIGNAL_SYNC_ON_GREEN; | |
830 | } | |
831 | if (c & 0x01) { | |
832 | DPRINTK("Serration on "); | |
833 | specs->signal |= FB_SIGNAL_SERRATION_ON; | |
834 | } | |
835 | DPRINTK("\n"); | |
836 | specs->max_x = block[1]; | |
837 | specs->max_y = block[2]; | |
838 | DPRINTK(" Max H-size in cm: "); | |
839 | if (specs->max_x) | |
840 | DPRINTK("%d\n", specs->max_x); | |
841 | else | |
842 | DPRINTK("variable\n"); | |
843 | DPRINTK(" Max V-size in cm: "); | |
844 | if (specs->max_y) | |
845 | DPRINTK("%d\n", specs->max_y); | |
846 | else | |
847 | DPRINTK("variable\n"); | |
848 | ||
849 | c = block[3]; | |
850 | specs->gamma = c+100; | |
851 | DPRINTK(" Gamma: "); | |
852 | DPRINTK("%d.%d\n", specs->gamma/100, specs->gamma % 100); | |
853 | ||
854 | get_dpms_capabilities(block[4], specs); | |
855 | ||
856 | switch ((block[4] & 0x18) >> 3) { | |
857 | case 0: | |
858 | DPRINTK(" Monochrome/Grayscale\n"); | |
859 | specs->input |= FB_DISP_MONO; | |
860 | break; | |
861 | case 1: | |
862 | DPRINTK(" RGB Color Display\n"); | |
863 | specs->input |= FB_DISP_RGB; | |
864 | break; | |
865 | case 2: | |
866 | DPRINTK(" Non-RGB Multicolor Display\n"); | |
867 | specs->input |= FB_DISP_MULTI; | |
868 | break; | |
869 | default: | |
870 | DPRINTK(" Unknown\n"); | |
871 | specs->input |= FB_DISP_UNKNOWN; | |
872 | break; | |
873 | } | |
874 | ||
875 | get_chroma(block, specs); | |
876 | ||
877 | specs->misc = 0; | |
878 | c = block[4] & 0x7; | |
879 | if (c & 0x04) { | |
880 | DPRINTK(" Default color format is primary\n"); | |
881 | specs->misc |= FB_MISC_PRIM_COLOR; | |
882 | } | |
883 | if (c & 0x02) { | |
884 | DPRINTK(" First DETAILED Timing is preferred\n"); | |
885 | specs->misc |= FB_MISC_1ST_DETAIL; | |
886 | } | |
887 | if (c & 0x01) { | |
888 | printk(" Display is GTF capable\n"); | |
889 | specs->gtf = 1; | |
890 | } | |
891 | } | |
892 | ||
1da177e4 LT |
893 | int fb_parse_edid(unsigned char *edid, struct fb_var_screeninfo *var) |
894 | { | |
895 | int i; | |
896 | unsigned char *block; | |
897 | ||
898 | if (edid == NULL || var == NULL) | |
899 | return 1; | |
900 | ||
901 | if (!(edid_checksum(edid))) | |
902 | return 1; | |
903 | ||
904 | if (!(edid_check_header(edid))) | |
905 | return 1; | |
906 | ||
907 | block = edid + DETAILED_TIMING_DESCRIPTIONS_START; | |
908 | ||
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; | |
43a3abc6 | 913 | var->height = var->width = 0; |
1da177e4 LT |
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 - | |
918 | V_SYNC_WIDTH; | |
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); | |
925 | ||
926 | if (HSYNC_POSITIVE) | |
927 | var->sync |= FB_SYNC_HOR_HIGH_ACT; | |
928 | if (VSYNC_POSITIVE) | |
929 | var->sync |= FB_SYNC_VERT_HIGH_ACT; | |
930 | return 0; | |
931 | } | |
932 | } | |
933 | return 1; | |
934 | } | |
935 | ||
936 | void fb_edid_to_monspecs(unsigned char *edid, struct fb_monspecs *specs) | |
937 | { | |
938 | unsigned char *block; | |
475666d4 | 939 | int i, found = 0; |
1da177e4 LT |
940 | |
941 | if (edid == NULL) | |
942 | return; | |
943 | ||
944 | if (!(edid_checksum(edid))) | |
945 | return; | |
946 | ||
947 | if (!(edid_check_header(edid))) | |
948 | return; | |
949 | ||
950 | memset(specs, 0, sizeof(struct fb_monspecs)); | |
951 | ||
952 | specs->version = edid[EDID_STRUCT_VERSION]; | |
953 | specs->revision = edid[EDID_STRUCT_REVISION]; | |
954 | ||
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); | |
960 | ||
961 | parse_vendor_block(edid + ID_MANUFACTURER_NAME, specs); | |
962 | ||
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); | |
974 | } | |
975 | } | |
976 | ||
977 | DPRINTK(" Display Characteristics:\n"); | |
978 | get_monspecs(edid, specs); | |
979 | ||
72bbf10b | 980 | specs->modedb = fb_create_modedb(edid, &specs->modedb_len, specs); |
475666d4 AD |
981 | |
982 | /* | |
983 | * Workaround for buggy EDIDs that sets that the first | |
984 | * detailed timing is preferred but has not detailed | |
985 | * timing specified | |
986 | */ | |
987 | for (i = 0; i < specs->modedb_len; i++) { | |
988 | if (specs->modedb[i].flag & FB_MODE_IS_DETAILED) { | |
989 | found = 1; | |
990 | break; | |
991 | } | |
992 | } | |
993 | ||
994 | if (!found) | |
995 | specs->misc &= ~FB_MISC_1ST_DETAIL; | |
996 | ||
1da177e4 LT |
997 | DPRINTK("========================================\n"); |
998 | } | |
999 | ||
e4105119 GL |
1000 | /** |
1001 | * fb_edid_add_monspecs() - add monitor video modes from E-EDID data | |
1002 | * @edid: 128 byte array with an E-EDID block | |
1003 | * @spacs: monitor specs to be extended | |
1004 | */ | |
9fbbdde9 EG |
1005 | void fb_edid_add_monspecs(unsigned char *edid, struct fb_monspecs *specs) |
1006 | { | |
1007 | unsigned char *block; | |
e4105119 GL |
1008 | struct fb_videomode *m; |
1009 | int num = 0, i; | |
0ad83f68 GL |
1010 | u8 svd[64], edt[(128 - 4) / DETAILED_TIMING_DESCRIPTION_SIZE]; |
1011 | u8 pos = 4, svd_n = 0; | |
9fbbdde9 | 1012 | |
e4105119 | 1013 | if (!edid) |
9fbbdde9 EG |
1014 | return; |
1015 | ||
1016 | if (!edid_checksum(edid)) | |
1017 | return; | |
1018 | ||
e4105119 GL |
1019 | if (edid[0] != 0x2 || |
1020 | edid[2] < 4 || edid[2] > 128 - DETAILED_TIMING_DESCRIPTION_SIZE) | |
9fbbdde9 EG |
1021 | return; |
1022 | ||
0ad83f68 GL |
1023 | DPRINTK(" Short Video Descriptors\n"); |
1024 | ||
1025 | while (pos < edid[2]) { | |
1026 | u8 len = edid[pos] & 0x1f, type = (edid[pos] >> 5) & 7; | |
1027 | pr_debug("Data block %u of %u bytes\n", type, len); | |
e6853aaf | 1028 | if (type == 2) { |
0ad83f68 GL |
1029 | for (i = pos; i < pos + len; i++) { |
1030 | u8 idx = edid[pos + i] & 0x7f; | |
1031 | svd[svd_n++] = idx; | |
1032 | pr_debug("N%sative mode #%d\n", | |
1033 | edid[pos + i] & 0x80 ? "" : "on-n", idx); | |
1034 | } | |
e6853aaf DU |
1035 | } else if (type == 3 && len >= 3) { |
1036 | /* Check Vendor Specific Data Block. For HDMI, | |
1037 | it is always 00-0C-03 for HDMI Licensing, LLC. */ | |
1038 | if (edid[pos + 1] == 3 && edid[pos + 2] == 0xc && | |
1039 | edid[pos + 3] == 0) | |
1040 | specs->misc |= FB_MISC_HDMI; | |
1041 | } | |
0ad83f68 GL |
1042 | pos += len + 1; |
1043 | } | |
1044 | ||
e4105119 | 1045 | block = edid + edid[2]; |
9fbbdde9 EG |
1046 | |
1047 | DPRINTK(" Extended Detailed Timings\n"); | |
1048 | ||
e4105119 GL |
1049 | for (i = 0; i < (128 - edid[2]) / DETAILED_TIMING_DESCRIPTION_SIZE; |
1050 | i++, block += DETAILED_TIMING_DESCRIPTION_SIZE) | |
1051 | if (PIXEL_CLOCK) | |
1052 | edt[num++] = block - edid; | |
9fbbdde9 EG |
1053 | |
1054 | /* Yikes, EDID data is totally useless */ | |
0ad83f68 | 1055 | if (!(num + svd_n)) |
9fbbdde9 | 1056 | return; |
9fbbdde9 | 1057 | |
0ad83f68 | 1058 | m = kzalloc((specs->modedb_len + num + svd_n) * |
9fbbdde9 EG |
1059 | sizeof(struct fb_videomode), GFP_KERNEL); |
1060 | ||
e4105119 | 1061 | if (!m) |
9fbbdde9 | 1062 | return; |
e4105119 GL |
1063 | |
1064 | memcpy(m, specs->modedb, specs->modedb_len * sizeof(struct fb_videomode)); | |
1065 | ||
1066 | for (i = specs->modedb_len; i < specs->modedb_len + num; i++) { | |
1067 | get_detailed_timing(edid + edt[i - specs->modedb_len], &m[i]); | |
1068 | if (i == specs->modedb_len) | |
1069 | m[i].flag |= FB_MODE_IS_FIRST; | |
1070 | pr_debug("Adding %ux%u@%u\n", m[i].xres, m[i].yres, m[i].refresh); | |
9fbbdde9 EG |
1071 | } |
1072 | ||
0ad83f68 GL |
1073 | for (i = specs->modedb_len + num; i < specs->modedb_len + num + svd_n; i++) { |
1074 | int idx = svd[i - specs->modedb_len - num]; | |
6080a893 | 1075 | if (!idx || idx >= ARRAY_SIZE(cea_modes)) { |
0ad83f68 | 1076 | pr_warning("Reserved SVD code %d\n", idx); |
6080a893 | 1077 | } else if (!cea_modes[idx].xres) { |
0ad83f68 GL |
1078 | pr_warning("Unimplemented SVD code %d\n", idx); |
1079 | } else { | |
1080 | memcpy(&m[i], cea_modes + idx, sizeof(m[i])); | |
1081 | pr_debug("Adding SVD #%d: %ux%u@%u\n", idx, | |
1082 | m[i].xres, m[i].yres, m[i].refresh); | |
1083 | } | |
1084 | } | |
1085 | ||
9fbbdde9 EG |
1086 | kfree(specs->modedb); |
1087 | specs->modedb = m; | |
0ad83f68 | 1088 | specs->modedb_len = specs->modedb_len + num + svd_n; |
9fbbdde9 EG |
1089 | } |
1090 | ||
8c85fd89 AH |
1091 | /* |
1092 | * VESA Generalized Timing Formula (GTF) | |
1da177e4 LT |
1093 | */ |
1094 | ||
1095 | #define FLYBACK 550 | |
1096 | #define V_FRONTPORCH 1 | |
1097 | #define H_OFFSET 40 | |
1098 | #define H_SCALEFACTOR 20 | |
1099 | #define H_BLANKSCALE 128 | |
1100 | #define H_GRADIENT 600 | |
1101 | #define C_VAL 30 | |
1102 | #define M_VAL 300 | |
1103 | ||
1104 | struct __fb_timings { | |
1105 | u32 dclk; | |
1106 | u32 hfreq; | |
1107 | u32 vfreq; | |
1108 | u32 hactive; | |
1109 | u32 vactive; | |
1110 | u32 hblank; | |
1111 | u32 vblank; | |
1112 | u32 htotal; | |
1113 | u32 vtotal; | |
1114 | }; | |
1115 | ||
1116 | /** | |
1117 | * fb_get_vblank - get vertical blank time | |
1118 | * @hfreq: horizontal freq | |
1119 | * | |
1120 | * DESCRIPTION: | |
8c85fd89 | 1121 | * vblank = right_margin + vsync_len + left_margin |
1da177e4 LT |
1122 | * |
1123 | * given: right_margin = 1 (V_FRONTPORCH) | |
1124 | * vsync_len = 3 | |
1125 | * flyback = 550 | |
1126 | * | |
1127 | * flyback * hfreq | |
1128 | * left_margin = --------------- - vsync_len | |
1129 | * 1000000 | |
1130 | */ | |
1131 | static u32 fb_get_vblank(u32 hfreq) | |
1132 | { | |
1133 | u32 vblank; | |
1134 | ||
8c85fd89 | 1135 | vblank = (hfreq * FLYBACK)/1000; |
1da177e4 LT |
1136 | vblank = (vblank + 500)/1000; |
1137 | return (vblank + V_FRONTPORCH); | |
1138 | } | |
1139 | ||
8c85fd89 | 1140 | /** |
1da177e4 LT |
1141 | * fb_get_hblank_by_freq - get horizontal blank time given hfreq |
1142 | * @hfreq: horizontal freq | |
1143 | * @xres: horizontal resolution in pixels | |
1144 | * | |
1145 | * DESCRIPTION: | |
1146 | * | |
1147 | * xres * duty_cycle | |
1148 | * hblank = ------------------ | |
1149 | * 100 - duty_cycle | |
1150 | * | |
1151 | * duty cycle = percent of htotal assigned to inactive display | |
1152 | * duty cycle = C - (M/Hfreq) | |
1153 | * | |
1154 | * where: C = ((offset - scale factor) * blank_scale) | |
1155 | * -------------------------------------- + scale factor | |
8c85fd89 | 1156 | * 256 |
1da177e4 LT |
1157 | * M = blank_scale * gradient |
1158 | * | |
1159 | */ | |
1160 | static u32 fb_get_hblank_by_hfreq(u32 hfreq, u32 xres) | |
1161 | { | |
1162 | u32 c_val, m_val, duty_cycle, hblank; | |
1163 | ||
8c85fd89 | 1164 | c_val = (((H_OFFSET - H_SCALEFACTOR) * H_BLANKSCALE)/256 + |
1da177e4 LT |
1165 | H_SCALEFACTOR) * 1000; |
1166 | m_val = (H_BLANKSCALE * H_GRADIENT)/256; | |
1167 | m_val = (m_val * 1000000)/hfreq; | |
1168 | duty_cycle = c_val - m_val; | |
1169 | hblank = (xres * duty_cycle)/(100000 - duty_cycle); | |
1170 | return (hblank); | |
1171 | } | |
1172 | ||
8c85fd89 | 1173 | /** |
1da177e4 LT |
1174 | * fb_get_hblank_by_dclk - get horizontal blank time given pixelclock |
1175 | * @dclk: pixelclock in Hz | |
1176 | * @xres: horizontal resolution in pixels | |
1177 | * | |
1178 | * DESCRIPTION: | |
1179 | * | |
1180 | * xres * duty_cycle | |
1181 | * hblank = ------------------ | |
1182 | * 100 - duty_cycle | |
1183 | * | |
1184 | * duty cycle = percent of htotal assigned to inactive display | |
1185 | * duty cycle = C - (M * h_period) | |
8c85fd89 | 1186 | * |
1da177e4 LT |
1187 | * where: h_period = SQRT(100 - C + (0.4 * xres * M)/dclk) + C - 100 |
1188 | * ----------------------------------------------- | |
1189 | * 2 * M | |
1190 | * M = 300; | |
1191 | * C = 30; | |
1192 | ||
1193 | */ | |
1194 | static u32 fb_get_hblank_by_dclk(u32 dclk, u32 xres) | |
1195 | { | |
1196 | u32 duty_cycle, h_period, hblank; | |
1197 | ||
1198 | dclk /= 1000; | |
1199 | h_period = 100 - C_VAL; | |
1200 | h_period *= h_period; | |
1201 | h_period += (M_VAL * xres * 2 * 1000)/(5 * dclk); | |
8c85fd89 | 1202 | h_period *= 10000; |
1da177e4 LT |
1203 | |
1204 | h_period = int_sqrt(h_period); | |
1205 | h_period -= (100 - C_VAL) * 100; | |
8c85fd89 | 1206 | h_period *= 1000; |
1da177e4 LT |
1207 | h_period /= 2 * M_VAL; |
1208 | ||
1209 | duty_cycle = C_VAL * 1000 - (M_VAL * h_period)/100; | |
1210 | hblank = (xres * duty_cycle)/(100000 - duty_cycle) + 8; | |
1211 | hblank &= ~15; | |
1212 | return (hblank); | |
1213 | } | |
8c85fd89 | 1214 | |
1da177e4 LT |
1215 | /** |
1216 | * fb_get_hfreq - estimate hsync | |
1217 | * @vfreq: vertical refresh rate | |
1218 | * @yres: vertical resolution | |
1219 | * | |
1220 | * DESCRIPTION: | |
1221 | * | |
1222 | * (yres + front_port) * vfreq * 1000000 | |
1223 | * hfreq = ------------------------------------- | |
1224 | * (1000000 - (vfreq * FLYBACK) | |
8c85fd89 | 1225 | * |
1da177e4 LT |
1226 | */ |
1227 | ||
1228 | static u32 fb_get_hfreq(u32 vfreq, u32 yres) | |
1229 | { | |
1230 | u32 divisor, hfreq; | |
8c85fd89 | 1231 | |
1da177e4 LT |
1232 | divisor = (1000000 - (vfreq * FLYBACK))/1000; |
1233 | hfreq = (yres + V_FRONTPORCH) * vfreq * 1000; | |
1234 | return (hfreq/divisor); | |
1235 | } | |
1236 | ||
1237 | static void fb_timings_vfreq(struct __fb_timings *timings) | |
1238 | { | |
1239 | timings->hfreq = fb_get_hfreq(timings->vfreq, timings->vactive); | |
1240 | timings->vblank = fb_get_vblank(timings->hfreq); | |
1241 | timings->vtotal = timings->vactive + timings->vblank; | |
8c85fd89 | 1242 | timings->hblank = fb_get_hblank_by_hfreq(timings->hfreq, |
1da177e4 LT |
1243 | timings->hactive); |
1244 | timings->htotal = timings->hactive + timings->hblank; | |
1245 | timings->dclk = timings->htotal * timings->hfreq; | |
1246 | } | |
1247 | ||
1248 | static void fb_timings_hfreq(struct __fb_timings *timings) | |
1249 | { | |
1250 | timings->vblank = fb_get_vblank(timings->hfreq); | |
1251 | timings->vtotal = timings->vactive + timings->vblank; | |
1252 | timings->vfreq = timings->hfreq/timings->vtotal; | |
8c85fd89 | 1253 | timings->hblank = fb_get_hblank_by_hfreq(timings->hfreq, |
1da177e4 LT |
1254 | timings->hactive); |
1255 | timings->htotal = timings->hactive + timings->hblank; | |
1256 | timings->dclk = timings->htotal * timings->hfreq; | |
1257 | } | |
1258 | ||
1259 | static void fb_timings_dclk(struct __fb_timings *timings) | |
1260 | { | |
8c85fd89 | 1261 | timings->hblank = fb_get_hblank_by_dclk(timings->dclk, |
1da177e4 LT |
1262 | timings->hactive); |
1263 | timings->htotal = timings->hactive + timings->hblank; | |
1264 | timings->hfreq = timings->dclk/timings->htotal; | |
1265 | timings->vblank = fb_get_vblank(timings->hfreq); | |
1266 | timings->vtotal = timings->vactive + timings->vblank; | |
1267 | timings->vfreq = timings->hfreq/timings->vtotal; | |
1268 | } | |
1269 | ||
1270 | /* | |
1271 | * fb_get_mode - calculates video mode using VESA GTF | |
1272 | * @flags: if: 0 - maximize vertical refresh rate | |
1273 | * 1 - vrefresh-driven calculation; | |
1274 | * 2 - hscan-driven calculation; | |
1275 | * 3 - pixelclock-driven calculation; | |
1276 | * @val: depending on @flags, ignored, vrefresh, hsync or pixelclock | |
1277 | * @var: pointer to fb_var_screeninfo | |
1278 | * @info: pointer to fb_info | |
1279 | * | |
1280 | * DESCRIPTION: | |
8c85fd89 AH |
1281 | * Calculates video mode based on monitor specs using VESA GTF. |
1282 | * The GTF is best for VESA GTF compliant monitors but is | |
1da177e4 LT |
1283 | * specifically formulated to work for older monitors as well. |
1284 | * | |
8c85fd89 | 1285 | * If @flag==0, the function will attempt to maximize the |
1da177e4 | 1286 | * refresh rate. Otherwise, it will calculate timings based on |
8c85fd89 | 1287 | * the flag and accompanying value. |
1da177e4 | 1288 | * |
8c85fd89 | 1289 | * If FB_IGNOREMON bit is set in @flags, monitor specs will be |
1da177e4 LT |
1290 | * ignored and @var will be filled with the calculated timings. |
1291 | * | |
1292 | * All calculations are based on the VESA GTF Spreadsheet | |
1293 | * available at VESA's public ftp (http://www.vesa.org). | |
8c85fd89 | 1294 | * |
1da177e4 LT |
1295 | * NOTES: |
1296 | * The timings generated by the GTF will be different from VESA | |
1297 | * DMT. It might be a good idea to keep a table of standard | |
1298 | * VESA modes as well. The GTF may also not work for some displays, | |
1299 | * such as, and especially, analog TV. | |
8c85fd89 | 1300 | * |
1da177e4 LT |
1301 | * REQUIRES: |
1302 | * A valid info->monspecs, otherwise 'safe numbers' will be used. | |
8c85fd89 | 1303 | */ |
1da177e4 LT |
1304 | int fb_get_mode(int flags, u32 val, struct fb_var_screeninfo *var, struct fb_info *info) |
1305 | { | |
af5d0f7e | 1306 | struct __fb_timings *timings; |
1da177e4 | 1307 | u32 interlace = 1, dscan = 1; |
af5d0f7e AD |
1308 | u32 hfmin, hfmax, vfmin, vfmax, dclkmin, dclkmax, err = 0; |
1309 | ||
1310 | ||
1311 | timings = kzalloc(sizeof(struct __fb_timings), GFP_KERNEL); | |
1312 | ||
1313 | if (!timings) | |
1314 | return -ENOMEM; | |
1da177e4 | 1315 | |
8c85fd89 | 1316 | /* |
1da177e4 LT |
1317 | * If monspecs are invalid, use values that are enough |
1318 | * for 640x480@60 | |
1319 | */ | |
af5d0f7e | 1320 | if (!info || !info->monspecs.hfmax || !info->monspecs.vfmax || |
1da177e4 LT |
1321 | !info->monspecs.dclkmax || |
1322 | info->monspecs.hfmax < info->monspecs.hfmin || | |
1323 | info->monspecs.vfmax < info->monspecs.vfmin || | |
1324 | info->monspecs.dclkmax < info->monspecs.dclkmin) { | |
1325 | hfmin = 29000; hfmax = 30000; | |
1326 | vfmin = 60; vfmax = 60; | |
1327 | dclkmin = 0; dclkmax = 25000000; | |
1328 | } else { | |
1329 | hfmin = info->monspecs.hfmin; | |
1330 | hfmax = info->monspecs.hfmax; | |
1331 | vfmin = info->monspecs.vfmin; | |
1332 | vfmax = info->monspecs.vfmax; | |
1333 | dclkmin = info->monspecs.dclkmin; | |
1334 | dclkmax = info->monspecs.dclkmax; | |
1335 | } | |
1336 | ||
af5d0f7e AD |
1337 | timings->hactive = var->xres; |
1338 | timings->vactive = var->yres; | |
8c85fd89 | 1339 | if (var->vmode & FB_VMODE_INTERLACED) { |
af5d0f7e | 1340 | timings->vactive /= 2; |
1da177e4 LT |
1341 | interlace = 2; |
1342 | } | |
1343 | if (var->vmode & FB_VMODE_DOUBLE) { | |
af5d0f7e | 1344 | timings->vactive *= 2; |
1da177e4 LT |
1345 | dscan = 2; |
1346 | } | |
1347 | ||
1348 | switch (flags & ~FB_IGNOREMON) { | |
1349 | case FB_MAXTIMINGS: /* maximize refresh rate */ | |
af5d0f7e AD |
1350 | timings->hfreq = hfmax; |
1351 | fb_timings_hfreq(timings); | |
1352 | if (timings->vfreq > vfmax) { | |
1353 | timings->vfreq = vfmax; | |
1354 | fb_timings_vfreq(timings); | |
1da177e4 | 1355 | } |
af5d0f7e AD |
1356 | if (timings->dclk > dclkmax) { |
1357 | timings->dclk = dclkmax; | |
1358 | fb_timings_dclk(timings); | |
1da177e4 LT |
1359 | } |
1360 | break; | |
1361 | case FB_VSYNCTIMINGS: /* vrefresh driven */ | |
af5d0f7e AD |
1362 | timings->vfreq = val; |
1363 | fb_timings_vfreq(timings); | |
1da177e4 LT |
1364 | break; |
1365 | case FB_HSYNCTIMINGS: /* hsync driven */ | |
af5d0f7e AD |
1366 | timings->hfreq = val; |
1367 | fb_timings_hfreq(timings); | |
1da177e4 LT |
1368 | break; |
1369 | case FB_DCLKTIMINGS: /* pixelclock driven */ | |
af5d0f7e AD |
1370 | timings->dclk = PICOS2KHZ(val) * 1000; |
1371 | fb_timings_dclk(timings); | |
1da177e4 LT |
1372 | break; |
1373 | default: | |
af5d0f7e | 1374 | err = -EINVAL; |
8c85fd89 AH |
1375 | |
1376 | } | |
1377 | ||
af5d0f7e AD |
1378 | if (err || (!(flags & FB_IGNOREMON) && |
1379 | (timings->vfreq < vfmin || timings->vfreq > vfmax || | |
1380 | timings->hfreq < hfmin || timings->hfreq > hfmax || | |
1381 | timings->dclk < dclkmin || timings->dclk > dclkmax))) { | |
1382 | err = -EINVAL; | |
1383 | } else { | |
1384 | var->pixclock = KHZ2PICOS(timings->dclk/1000); | |
1385 | var->hsync_len = (timings->htotal * 8)/100; | |
1386 | var->right_margin = (timings->hblank/2) - var->hsync_len; | |
1387 | var->left_margin = timings->hblank - var->right_margin - | |
1388 | var->hsync_len; | |
1389 | var->vsync_len = (3 * interlace)/dscan; | |
1390 | var->lower_margin = (1 * interlace)/dscan; | |
1391 | var->upper_margin = (timings->vblank * interlace)/dscan - | |
1392 | (var->vsync_len + var->lower_margin); | |
1393 | } | |
8c85fd89 | 1394 | |
af5d0f7e AD |
1395 | kfree(timings); |
1396 | return err; | |
1da177e4 | 1397 | } |
2db54c72 | 1398 | |
a38884f6 | 1399 | #ifdef CONFIG_VIDEOMODE_HELPERS |
2db54c72 ST |
1400 | int fb_videomode_from_videomode(const struct videomode *vm, |
1401 | struct fb_videomode *fbmode) | |
1402 | { | |
1403 | unsigned int htotal, vtotal; | |
1404 | ||
1405 | fbmode->xres = vm->hactive; | |
1406 | fbmode->left_margin = vm->hback_porch; | |
1407 | fbmode->right_margin = vm->hfront_porch; | |
1408 | fbmode->hsync_len = vm->hsync_len; | |
1409 | ||
1410 | fbmode->yres = vm->vactive; | |
1411 | fbmode->upper_margin = vm->vback_porch; | |
1412 | fbmode->lower_margin = vm->vfront_porch; | |
1413 | fbmode->vsync_len = vm->vsync_len; | |
1414 | ||
1415 | /* prevent division by zero in KHZ2PICOS macro */ | |
1416 | fbmode->pixclock = vm->pixelclock ? | |
1417 | KHZ2PICOS(vm->pixelclock / 1000) : 0; | |
1418 | ||
1419 | fbmode->sync = 0; | |
1420 | fbmode->vmode = 0; | |
06a33079 | 1421 | if (vm->flags & DISPLAY_FLAGS_HSYNC_HIGH) |
2db54c72 | 1422 | fbmode->sync |= FB_SYNC_HOR_HIGH_ACT; |
9bf9d47a | 1423 | if (vm->flags & DISPLAY_FLAGS_VSYNC_HIGH) |
2db54c72 | 1424 | fbmode->sync |= FB_SYNC_VERT_HIGH_ACT; |
06a33079 | 1425 | if (vm->flags & DISPLAY_FLAGS_INTERLACED) |
2db54c72 | 1426 | fbmode->vmode |= FB_VMODE_INTERLACED; |
06a33079 | 1427 | if (vm->flags & DISPLAY_FLAGS_DOUBLESCAN) |
2db54c72 ST |
1428 | fbmode->vmode |= FB_VMODE_DOUBLE; |
1429 | fbmode->flag = 0; | |
1430 | ||
1431 | htotal = vm->hactive + vm->hfront_porch + vm->hback_porch + | |
1432 | vm->hsync_len; | |
1433 | vtotal = vm->vactive + vm->vfront_porch + vm->vback_porch + | |
1434 | vm->vsync_len; | |
1435 | /* prevent division by zero */ | |
1436 | if (htotal && vtotal) { | |
1437 | fbmode->refresh = vm->pixelclock / (htotal * vtotal); | |
1438 | /* a mode must have htotal and vtotal != 0 or it is invalid */ | |
1439 | } else { | |
1440 | fbmode->refresh = 0; | |
1441 | return -EINVAL; | |
1442 | } | |
1443 | ||
1444 | return 0; | |
1445 | } | |
1446 | EXPORT_SYMBOL_GPL(fb_videomode_from_videomode); | |
2db54c72 | 1447 | |
a38884f6 | 1448 | #ifdef CONFIG_OF |
79089044 ST |
1449 | static inline void dump_fb_videomode(const struct fb_videomode *m) |
1450 | { | |
1451 | pr_debug("fb_videomode = %ux%u@%uHz (%ukHz) %u %u %u %u %u %u %u %u %u\n", | |
1452 | m->xres, m->yres, m->refresh, m->pixclock, m->left_margin, | |
1453 | m->right_margin, m->upper_margin, m->lower_margin, | |
1454 | m->hsync_len, m->vsync_len, m->sync, m->vmode, m->flag); | |
1455 | } | |
1456 | ||
1457 | /** | |
1458 | * of_get_fb_videomode - get a fb_videomode from devicetree | |
1459 | * @np: device_node with the timing specification | |
1460 | * @fb: will be set to the return value | |
1461 | * @index: index into the list of display timings in devicetree | |
1462 | * | |
1463 | * DESCRIPTION: | |
1464 | * This function is expensive and should only be used, if only one mode is to be | |
1465 | * read from DT. To get multiple modes start with of_get_display_timings ond | |
1466 | * work with that instead. | |
1467 | */ | |
1468 | int of_get_fb_videomode(struct device_node *np, struct fb_videomode *fb, | |
1469 | int index) | |
1470 | { | |
1471 | struct videomode vm; | |
1472 | int ret; | |
1473 | ||
1474 | ret = of_get_videomode(np, &vm, index); | |
1475 | if (ret) | |
1476 | return ret; | |
1477 | ||
9f5ddefd VM |
1478 | ret = fb_videomode_from_videomode(&vm, fb); |
1479 | if (ret) | |
1480 | return ret; | |
79089044 ST |
1481 | |
1482 | pr_debug("%s: got %dx%d display mode from %s\n", | |
1483 | of_node_full_name(np), vm.hactive, vm.vactive, np->name); | |
1484 | dump_fb_videomode(fb); | |
1485 | ||
1486 | return 0; | |
1487 | } | |
1488 | EXPORT_SYMBOL_GPL(of_get_fb_videomode); | |
a38884f6 TV |
1489 | #endif /* CONFIG_OF */ |
1490 | #endif /* CONFIG_VIDEOMODE_HELPERS */ | |
79089044 | 1491 | |
1da177e4 LT |
1492 | #else |
1493 | int fb_parse_edid(unsigned char *edid, struct fb_var_screeninfo *var) | |
1494 | { | |
1495 | return 1; | |
1496 | } | |
1497 | void fb_edid_to_monspecs(unsigned char *edid, struct fb_monspecs *specs) | |
1498 | { | |
1499 | specs = NULL; | |
1500 | } | |
e4105119 GL |
1501 | void fb_edid_add_monspecs(unsigned char *edid, struct fb_monspecs *specs) |
1502 | { | |
1503 | } | |
1da177e4 LT |
1504 | void fb_destroy_modedb(struct fb_videomode *modedb) |
1505 | { | |
1506 | } | |
1507 | int fb_get_mode(int flags, u32 val, struct fb_var_screeninfo *var, | |
1508 | struct fb_info *info) | |
1509 | { | |
1510 | return -EINVAL; | |
1511 | } | |
1512 | #endif /* CONFIG_FB_MODE_HELPERS */ | |
8c85fd89 | 1513 | |
1da177e4 LT |
1514 | /* |
1515 | * fb_validate_mode - validates var against monitor capabilities | |
1516 | * @var: pointer to fb_var_screeninfo | |
1517 | * @info: pointer to fb_info | |
1518 | * | |
1519 | * DESCRIPTION: | |
1520 | * Validates video mode against monitor capabilities specified in | |
1521 | * info->monspecs. | |
1522 | * | |
1523 | * REQUIRES: | |
1524 | * A valid info->monspecs. | |
1525 | */ | |
1526 | int fb_validate_mode(const struct fb_var_screeninfo *var, struct fb_info *info) | |
1527 | { | |
1528 | u32 hfreq, vfreq, htotal, vtotal, pixclock; | |
1529 | u32 hfmin, hfmax, vfmin, vfmax, dclkmin, dclkmax; | |
1530 | ||
8c85fd89 | 1531 | /* |
1da177e4 LT |
1532 | * If monspecs are invalid, use values that are enough |
1533 | * for 640x480@60 | |
1534 | */ | |
1535 | if (!info->monspecs.hfmax || !info->monspecs.vfmax || | |
1536 | !info->monspecs.dclkmax || | |
1537 | info->monspecs.hfmax < info->monspecs.hfmin || | |
1538 | info->monspecs.vfmax < info->monspecs.vfmin || | |
1539 | info->monspecs.dclkmax < info->monspecs.dclkmin) { | |
1540 | hfmin = 29000; hfmax = 30000; | |
1541 | vfmin = 60; vfmax = 60; | |
1542 | dclkmin = 0; dclkmax = 25000000; | |
1543 | } else { | |
1544 | hfmin = info->monspecs.hfmin; | |
1545 | hfmax = info->monspecs.hfmax; | |
1546 | vfmin = info->monspecs.vfmin; | |
1547 | vfmax = info->monspecs.vfmax; | |
1548 | dclkmin = info->monspecs.dclkmin; | |
1549 | dclkmax = info->monspecs.dclkmax; | |
1550 | } | |
1551 | ||
1552 | if (!var->pixclock) | |
1553 | return -EINVAL; | |
1554 | pixclock = PICOS2KHZ(var->pixclock) * 1000; | |
8c85fd89 AH |
1555 | |
1556 | htotal = var->xres + var->right_margin + var->hsync_len + | |
1da177e4 | 1557 | var->left_margin; |
8c85fd89 | 1558 | vtotal = var->yres + var->lower_margin + var->vsync_len + |
1da177e4 LT |
1559 | var->upper_margin; |
1560 | ||
1561 | if (var->vmode & FB_VMODE_INTERLACED) | |
1562 | vtotal /= 2; | |
1563 | if (var->vmode & FB_VMODE_DOUBLE) | |
1564 | vtotal *= 2; | |
1565 | ||
1566 | hfreq = pixclock/htotal; | |
0a793b77 JS |
1567 | hfreq = (hfreq + 500) / 1000 * 1000; |
1568 | ||
1da177e4 LT |
1569 | vfreq = hfreq/vtotal; |
1570 | ||
8c85fd89 | 1571 | return (vfreq < vfmin || vfreq > vfmax || |
1da177e4 LT |
1572 | hfreq < hfmin || hfreq > hfmax || |
1573 | pixclock < dclkmin || pixclock > dclkmax) ? | |
1574 | -EINVAL : 0; | |
1575 | } | |
1576 | ||
ba70710e | 1577 | #if defined(CONFIG_FIRMWARE_EDID) && defined(CONFIG_X86) |
5e518d76 AD |
1578 | |
1579 | /* | |
1580 | * We need to ensure that the EDID block is only returned for | |
1581 | * the primary graphics adapter. | |
1582 | */ | |
1583 | ||
1584 | const unsigned char *fb_firmware_edid(struct device *device) | |
1585 | { | |
1586 | struct pci_dev *dev = NULL; | |
1587 | struct resource *res = NULL; | |
1588 | unsigned char *edid = NULL; | |
1589 | ||
1590 | if (device) | |
1591 | dev = to_pci_dev(device); | |
1592 | ||
1593 | if (dev) | |
1594 | res = &dev->resource[PCI_ROM_RESOURCE]; | |
1595 | ||
1596 | if (res && res->flags & IORESOURCE_ROM_SHADOW) | |
1597 | edid = edid_info.dummy; | |
1598 | ||
1599 | return edid; | |
1600 | } | |
1601 | #else | |
1602 | const unsigned char *fb_firmware_edid(struct device *device) | |
1603 | { | |
1604 | return NULL; | |
1605 | } | |
59153f7d AD |
1606 | #endif |
1607 | EXPORT_SYMBOL(fb_firmware_edid); | |
5e518d76 | 1608 | |
1da177e4 LT |
1609 | EXPORT_SYMBOL(fb_parse_edid); |
1610 | EXPORT_SYMBOL(fb_edid_to_monspecs); | |
e4105119 | 1611 | EXPORT_SYMBOL(fb_edid_add_monspecs); |
1da177e4 LT |
1612 | EXPORT_SYMBOL(fb_get_mode); |
1613 | EXPORT_SYMBOL(fb_validate_mode); | |
1614 | EXPORT_SYMBOL(fb_destroy_modedb); |