1 /*
2 * linux/drivers/video/modedb.c -- Standard video mode database management
3 *
4 * Copyright (C) 1999 Geert Uytterhoeven
5 *
6 * 2001 - Documented with DocBook
7 * - Brad Douglas <brad@neruo.com>
8 *
9 * This file is subject to the terms and conditions of the GNU General Public
10 * License. See the file COPYING in the main directory of this archive for
11 * more details.
12 */
13
14 #include <linux/module.h>
15 #include <linux/tty.h>
16 #include <linux/fb.h>
17 #include <linux/console_struct.h>
18 #include <linux/sched.h>
19 #include <video/fbcon.h>
20
21
22 #undef DEBUG
23
24 #define name_matches(v, s, l) \
25 ((v).name && !strncmp((s), (v).name, (l)) && strlen((v).name) == (l))
26 #define res_matches(v, x, y) \
27 ((v).xres == (x) && (v).yres == (y))
28
29 #ifdef DEBUG
30 #define DPRINTK(fmt, args...) printk(KERN_DEBUG "%s: " fmt, __FUNCTION__ , ## args)
31 #else
32 #define DPRINTK(fmt, args...)
33 #endif
34
35
36 const char *global_mode_option = NULL;
37
38
39 /*
40 * Standard video mode definitions (taken from XFree86)
41 */
42
43 #define DEFAULT_MODEDB_INDEX 0
44
45 static struct fb_videomode modedb[] __initdata = {
46 {
47 /* 640x400 @ 70 Hz, 31.5 kHz hsync */
48 NULL, 70, 640, 400, 39721, 40, 24, 39, 9, 96, 2,
49 0, FB_VMODE_NONINTERLACED
50 }, {
51 /* 640x480 @ 60 Hz, 31.5 kHz hsync */
52 NULL, 60, 640, 480, 39721, 40, 24, 32, 11, 96, 2,
53 0, FB_VMODE_NONINTERLACED
54 }, {
55 /* 800x600 @ 56 Hz, 35.15 kHz hsync */
56 NULL, 56, 800, 600, 27777, 128, 24, 22, 1, 72, 2,
57 0, FB_VMODE_NONINTERLACED
58 }, {
59 /* 1024x768 @ 87 Hz interlaced, 35.5 kHz hsync */
60 NULL, 87, 1024, 768, 22271, 56, 24, 33, 8, 160, 8,
61 0, FB_VMODE_INTERLACED
62 }, {
63 /* 640x400 @ 85 Hz, 37.86 kHz hsync */
64 NULL, 85, 640, 400, 31746, 96, 32, 41, 1, 64, 3,
65 FB_SYNC_VERT_HIGH_ACT, FB_VMODE_NONINTERLACED
66 }, {
67 /* 640x480 @ 72 Hz, 36.5 kHz hsync */
68 NULL, 72, 640, 480, 31746, 144, 40, 30, 8, 40, 3,
69 0, FB_VMODE_NONINTERLACED
70 }, {
71 /* 640x480 @ 75 Hz, 37.50 kHz hsync */
72 NULL, 75, 640, 480, 31746, 120, 16, 16, 1, 64, 3,
73 0, FB_VMODE_NONINTERLACED
74 }, {
75 /* 800x600 @ 60 Hz, 37.8 kHz hsync */
76 NULL, 60, 800, 600, 25000, 88, 40, 23, 1, 128, 4,
77 FB_SYNC_HOR_HIGH_ACT|FB_SYNC_VERT_HIGH_ACT, FB_VMODE_NONINTERLACED
78 }, {
79 /* 640x480 @ 85 Hz, 43.27 kHz hsync */
80 NULL, 85, 640, 480, 27777, 80, 56, 25, 1, 56, 3,
81 0, FB_VMODE_NONINTERLACED
82 }, {
83 /* 1152x864 @ 89 Hz interlaced, 44 kHz hsync */
84 NULL, 69, 1152, 864, 15384, 96, 16, 110, 1, 216, 10,
85 0, FB_VMODE_INTERLACED
86 }, {
87 /* 800x600 @ 72 Hz, 48.0 kHz hsync */
88 NULL, 72, 800, 600, 20000, 64, 56, 23, 37, 120, 6,
89 FB_SYNC_HOR_HIGH_ACT|FB_SYNC_VERT_HIGH_ACT, FB_VMODE_NONINTERLACED
90 }, {
91 /* 1024x768 @ 60 Hz, 48.4 kHz hsync */
92 NULL, 60, 1024, 768, 15384, 168, 8, 29, 3, 144, 6,
93 0, FB_VMODE_NONINTERLACED
94 }, {
95 /* 640x480 @ 100 Hz, 53.01 kHz hsync */
96 NULL, 100, 640, 480, 21834, 96, 32, 36, 8, 96, 6,
97 0, FB_VMODE_NONINTERLACED
98 }, {
99 /* 1152x864 @ 60 Hz, 53.5 kHz hsync */
100 NULL, 60, 1152, 864, 11123, 208, 64, 16, 4, 256, 8,
101 0, FB_VMODE_NONINTERLACED
102 }, {
103 /* 800x600 @ 85 Hz, 55.84 kHz hsync */
104 NULL, 85, 800, 600, 16460, 160, 64, 36, 16, 64, 5,
105 0, FB_VMODE_NONINTERLACED
106 }, {
107 /* 1024x768 @ 70 Hz, 56.5 kHz hsync */
108 NULL, 70, 1024, 768, 13333, 144, 24, 29, 3, 136, 6,
109 0, FB_VMODE_NONINTERLACED
110 }, {
111 /* 1280x1024 @ 87 Hz interlaced, 51 kHz hsync */
112 NULL, 87, 1280, 1024, 12500, 56, 16, 128, 1, 216, 12,
113 0, FB_VMODE_INTERLACED
114 }, {
115 /* 800x600 @ 100 Hz, 64.02 kHz hsync */
116 NULL, 100, 800, 600, 14357, 160, 64, 30, 4, 64, 6,
117 0, FB_VMODE_NONINTERLACED
118 }, {
119 /* 1024x768 @ 76 Hz, 62.5 kHz hsync */
120 NULL, 76, 1024, 768, 11764, 208, 8, 36, 16, 120, 3,
121 0, FB_VMODE_NONINTERLACED
122 }, {
123 /* 1152x864 @ 70 Hz, 62.4 kHz hsync */
124 NULL, 70, 1152, 864, 10869, 106, 56, 20, 1, 160, 10,
125 0, FB_VMODE_NONINTERLACED
126 }, {
127 /* 1280x1024 @ 61 Hz, 64.2 kHz hsync */
128 NULL, 61, 1280, 1024, 9090, 200, 48, 26, 1, 184, 3,
129 0, FB_VMODE_NONINTERLACED
130 }, {
131 /* 1024x768 @ 85 Hz, 70.24 kHz hsync */
132 NULL, 85, 1024, 768, 10111, 192, 32, 34, 14, 160, 6,
133 0, FB_VMODE_NONINTERLACED
134 }, {
135 /* 1152x864 @ 78 Hz, 70.8 kHz hsync */
136 NULL, 78, 1152, 864, 9090, 228, 88, 32, 0, 84, 12,
137 0, FB_VMODE_NONINTERLACED
138 }, {
139 /* 1280x1024 @ 70 Hz, 74.59 kHz hsync */
140 NULL, 70, 1280, 1024, 7905, 224, 32, 28, 8, 160, 8,
141 0, FB_VMODE_NONINTERLACED
142 }, {
143 /* 1600x1200 @ 60Hz, 75.00 kHz hsync */
144 NULL, 60, 1600, 1200, 6172, 304, 64, 46, 1, 192, 3,
145 FB_SYNC_HOR_HIGH_ACT|FB_SYNC_VERT_HIGH_ACT, FB_VMODE_NONINTERLACED
146 }, {
147 /* 1152x864 @ 84 Hz, 76.0 kHz hsync */
148 NULL, 84, 1152, 864, 7407, 184, 312, 32, 0, 128, 12,
149 0, FB_VMODE_NONINTERLACED
150 }, {
151 /* 1280x1024 @ 74 Hz, 78.85 kHz hsync */
152 NULL, 74, 1280, 1024, 7407, 256, 32, 34, 3, 144, 3,
153 0, FB_VMODE_NONINTERLACED
154 }, {
155 /* 1024x768 @ 100Hz, 80.21 kHz hsync */
156 NULL, 100, 1024, 768, 8658, 192, 32, 21, 3, 192, 10,
157 0, FB_VMODE_NONINTERLACED
158 }, {
159 /* 1280x1024 @ 76 Hz, 81.13 kHz hsync */
160 NULL, 76, 1280, 1024, 7407, 248, 32, 34, 3, 104, 3,
161 0, FB_VMODE_NONINTERLACED
162 }, {
163 /* 1600x1200 @ 70 Hz, 87.50 kHz hsync */
164 NULL, 70, 1600, 1200, 5291, 304, 64, 46, 1, 192, 3,
165 0, FB_VMODE_NONINTERLACED
166 }, {
167 /* 1152x864 @ 100 Hz, 89.62 kHz hsync */
168 NULL, 100, 1152, 864, 7264, 224, 32, 17, 2, 128, 19,
169 0, FB_VMODE_NONINTERLACED
170 }, {
171 /* 1280x1024 @ 85 Hz, 91.15 kHz hsync */
172 NULL, 85, 1280, 1024, 6349, 224, 64, 44, 1, 160, 3,
173 FB_SYNC_HOR_HIGH_ACT|FB_SYNC_VERT_HIGH_ACT, FB_VMODE_NONINTERLACED
174 }, {
175 /* 1600x1200 @ 75 Hz, 93.75 kHz hsync */
176 NULL, 75, 1600, 1200, 4938, 304, 64, 46, 1, 192, 3,
177 FB_SYNC_HOR_HIGH_ACT|FB_SYNC_VERT_HIGH_ACT, FB_VMODE_NONINTERLACED
178 }, {
179 /* 1600x1200 @ 85 Hz, 105.77 kHz hsync */
180 NULL, 85, 1600, 1200, 4545, 272, 16, 37, 4, 192, 3,
181 FB_SYNC_HOR_HIGH_ACT|FB_SYNC_VERT_HIGH_ACT, FB_VMODE_NONINTERLACED
182 }, {
183 /* 1280x1024 @ 100 Hz, 107.16 kHz hsync */
184 NULL, 100, 1280, 1024, 5502, 256, 32, 26, 7, 128, 15,
185 0, FB_VMODE_NONINTERLACED
186 }, {
187 /* 1800x1440 @ 64Hz, 96.15 kHz hsync */
188 NULL, 64, 1800, 1440, 4347, 304, 96, 46, 1, 192, 3,
189 FB_SYNC_HOR_HIGH_ACT|FB_SYNC_VERT_HIGH_ACT, FB_VMODE_NONINTERLACED
190 }, {
191 /* 1800x1440 @ 70Hz, 104.52 kHz hsync */
192 NULL, 70, 1800, 1440, 4000, 304, 96, 46, 1, 192, 3,
193 FB_SYNC_HOR_HIGH_ACT|FB_SYNC_VERT_HIGH_ACT, FB_VMODE_NONINTERLACED
194 }, {
195 /* 512x384 @ 78 Hz, 31.50 kHz hsync */
196 NULL, 78, 512, 384, 49603, 48, 16, 16, 1, 64, 3,
197 0, FB_VMODE_NONINTERLACED
198 }, {
199 /* 512x384 @ 85 Hz, 34.38 kHz hsync */
200 NULL, 85, 512, 384, 45454, 48, 16, 16, 1, 64, 3,
201 0, FB_VMODE_NONINTERLACED
202 }, {
203 /* 320x200 @ 70 Hz, 31.5 kHz hsync, 8:5 aspect ratio */
204 NULL, 70, 320, 200, 79440, 16, 16, 20, 4, 48, 1,
205 0, FB_VMODE_DOUBLE
206 }, {
207 /* 320x240 @ 60 Hz, 31.5 kHz hsync, 4:3 aspect ratio */
208 NULL, 60, 320, 240, 79440, 16, 16, 16, 5, 48, 1,
209 0, FB_VMODE_DOUBLE
210 }, {
211 /* 320x240 @ 72 Hz, 36.5 kHz hsync */
212 NULL, 72, 320, 240, 63492, 16, 16, 16, 4, 48, 2,
213 0, FB_VMODE_DOUBLE
214 }, {
215 /* 400x300 @ 56 Hz, 35.2 kHz hsync, 4:3 aspect ratio */
216 NULL, 56, 400, 300, 55555, 64, 16, 10, 1, 32, 1,
217 0, FB_VMODE_DOUBLE
218 }, {
219 /* 400x300 @ 60 Hz, 37.8 kHz hsync */
220 NULL, 60, 400, 300, 50000, 48, 16, 11, 1, 64, 2,
221 0, FB_VMODE_DOUBLE
222 }, {
223 /* 400x300 @ 72 Hz, 48.0 kHz hsync */
224 NULL, 72, 400, 300, 40000, 32, 24, 11, 19, 64, 3,
225 0, FB_VMODE_DOUBLE
226 }, {
227 /* 480x300 @ 56 Hz, 35.2 kHz hsync, 8:5 aspect ratio */
228 NULL, 56, 480, 300, 46176, 80, 16, 10, 1, 40, 1,
229 0, FB_VMODE_DOUBLE
230 }, {
231 /* 480x300 @ 60 Hz, 37.8 kHz hsync */
232 NULL, 60, 480, 300, 41858, 56, 16, 11, 1, 80, 2,
233 0, FB_VMODE_DOUBLE
234 }, {
235 /* 480x300 @ 63 Hz, 39.6 kHz hsync */
236 NULL, 63, 480, 300, 40000, 56, 16, 11, 1, 80, 2,
237 0, FB_VMODE_DOUBLE
238 }, {
239 /* 480x300 @ 72 Hz, 48.0 kHz hsync */
240 NULL, 72, 480, 300, 33386, 40, 24, 11, 19, 80, 3,
241 0, FB_VMODE_DOUBLE
242 },
243 };
244
245
my_atoi(const char * name)246 static int __init my_atoi(const char *name)
247 {
248 int val = 0;
249
250 for (;; name++) {
251 switch (*name) {
252 case '0'...'9':
253 val = 10*val+(*name-'0');
254 break;
255 default:
256 return val;
257 }
258 }
259 }
260
261
262 /**
263 * __fb_try_mode - test a video mode
264 * @var: frame buffer user defined part of display
265 * @info: frame buffer info structure
266 * @mode: frame buffer video mode structure
267 * @bpp: color depth in bits per pixel
268 *
269 * Tries a video mode to test it's validity for device @info.
270 *
271 * Returns 1 on success.
272 *
273 */
274
__fb_try_mode(struct fb_var_screeninfo * var,struct fb_info * info,const struct fb_videomode * mode,unsigned int bpp)275 int __fb_try_mode(struct fb_var_screeninfo *var, struct fb_info *info,
276 const struct fb_videomode *mode, unsigned int bpp)
277 {
278 int err;
279
280 DPRINTK("Trying mode %s %dx%d-%d@%d\n", mode->name ? mode->name : "noname",
281 mode->xres, mode->yres, bpp, mode->refresh);
282 var->xres = mode->xres;
283 var->yres = mode->yres;
284 var->xres_virtual = mode->xres;
285 var->yres_virtual = mode->yres;
286 var->xoffset = 0;
287 var->yoffset = 0;
288 var->bits_per_pixel = bpp;
289 var->activate |= FB_ACTIVATE_TEST;
290 var->pixclock = mode->pixclock;
291 var->left_margin = mode->left_margin;
292 var->right_margin = mode->right_margin;
293 var->upper_margin = mode->upper_margin;
294 var->lower_margin = mode->lower_margin;
295 var->hsync_len = mode->hsync_len;
296 var->vsync_len = mode->vsync_len;
297 var->sync = mode->sync;
298 var->vmode = mode->vmode;
299 err = info->fbops->fb_set_var(var, PROC_CONSOLE(info), info);
300 var->activate &= ~FB_ACTIVATE_TEST;
301 return !err;
302 }
303
304
305 /**
306 * fb_find_mode - finds a valid video mode
307 * @var: frame buffer user defined part of display
308 * @info: frame buffer info structure
309 * @mode_option: string video mode to find
310 * @db: video mode database
311 * @dbsize: size of @db
312 * @default_mode: default video mode to fall back to
313 * @default_bpp: default color depth in bits per pixel
314 *
315 * Finds a suitable video mode, starting with the specified mode
316 * in @mode_option with fallback to @default_mode. If
317 * @default_mode fails, all modes in the video mode database will
318 * be tried.
319 *
320 * Valid mode specifiers for @mode_option:
321 *
322 * <xres>x<yres>[-<bpp>][@<refresh>] or
323 * <name>[-<bpp>][@<refresh>]
324 *
325 * with <xres>, <yres>, <bpp> and <refresh> decimal numbers and
326 * <name> a string.
327 *
328 * NOTE: The passed struct @var is _not_ cleared! This allows you
329 * to supply values for e.g. the grayscale and accel_flags fields.
330 *
331 * Returns zero for failure, 1 if using specified @mode_option,
332 * 2 if using specified @mode_option with an ignored refresh rate,
333 * 3 if default mode is used, 4 if fall back to any valid mode.
334 *
335 */
336
fb_find_mode(struct fb_var_screeninfo * var,struct fb_info * info,const char * mode_option,const struct fb_videomode * db,unsigned int dbsize,const struct fb_videomode * default_mode,unsigned int default_bpp)337 int __init fb_find_mode(struct fb_var_screeninfo *var,
338 struct fb_info *info, const char *mode_option,
339 const struct fb_videomode *db, unsigned int dbsize,
340 const struct fb_videomode *default_mode,
341 unsigned int default_bpp)
342 {
343 int i, j;
344
345 /* Set up defaults */
346 if (!db) {
347 db = modedb;
348 dbsize = sizeof(modedb)/sizeof(*modedb);
349 }
350 if (!default_mode)
351 default_mode = &modedb[DEFAULT_MODEDB_INDEX];
352 if (!default_bpp)
353 default_bpp = 8;
354
355 /* Did the user specify a video mode? */
356 if (mode_option || (mode_option = global_mode_option)) {
357 const char *name = mode_option;
358 unsigned int namelen = strlen(name);
359 int res_specified = 0, bpp_specified = 0, refresh_specified = 0;
360 unsigned int xres = 0, yres = 0, bpp = default_bpp, refresh = 0;
361 int yres_specified = 0;
362
363 for (i = namelen-1; i >= 0; i--) {
364 switch (name[i]) {
365 case '@':
366 namelen = i;
367 if (!refresh_specified && !bpp_specified &&
368 !yres_specified) {
369 refresh = my_atoi(&name[i+1]);
370 refresh_specified = 1;
371 } else
372 goto done;
373 break;
374 case '-':
375 namelen = i;
376 if (!bpp_specified && !yres_specified) {
377 bpp = my_atoi(&name[i+1]);
378 bpp_specified = 1;
379 } else
380 goto done;
381 break;
382 case 'x':
383 if (!yres_specified) {
384 yres = my_atoi(&name[i+1]);
385 yres_specified = 1;
386 } else
387 goto done;
388 break;
389 case '0'...'9':
390 break;
391 default:
392 goto done;
393 }
394 }
395 if (i < 0 && yres_specified) {
396 xres = my_atoi(name);
397 res_specified = 1;
398 }
399 done:
400 for (i = refresh_specified; i >= 0; i--) {
401 DPRINTK("Trying specified video mode%s\n",
402 i ? "" : " (ignoring refresh rate)");
403 for (j = 0; j < dbsize; j++)
404 if ((name_matches(db[j], name, namelen) ||
405 (res_specified && res_matches(db[j], xres, yres))) &&
406 (!i || db[j].refresh == refresh) &&
407 __fb_try_mode(var, info, &db[j], bpp))
408 return 2-i;
409 }
410 }
411
412 DPRINTK("Trying default video mode\n");
413 if (__fb_try_mode(var, info, default_mode, default_bpp))
414 return 3;
415
416 DPRINTK("Trying all modes\n");
417 for (i = 0; i < dbsize; i++)
418 if (__fb_try_mode(var, info, &db[i], default_bpp))
419 return 4;
420
421 DPRINTK("No valid mode found\n");
422 return 0;
423 }
424
425 EXPORT_SYMBOL(__fb_try_mode);
426