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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/fb.h>
16 
17 #undef DEBUG
18 
19 #define name_matches(v, s, l) \
20     ((v).name && !strncmp((s), (v).name, (l)) && strlen((v).name) == (l))
21 #define res_matches(v, x, y) \
22     ((v).xres == (x) && (v).yres == (y))
23 
24 #ifdef DEBUG
25 #define DPRINTK(fmt, args...)	printk("modedb %s: " fmt, __func__ , ## args)
26 #else
27 #define DPRINTK(fmt, args...)
28 #endif
29 
30 const char *fb_mode_option;
31 EXPORT_SYMBOL_GPL(fb_mode_option);
32 
33     /*
34      *  Standard video mode definitions (taken from XFree86)
35      */
36 
37 static const struct fb_videomode modedb[] = {
38     {
39 	/* 640x400 @ 70 Hz, 31.5 kHz hsync */
40 	NULL, 70, 640, 400, 39721, 40, 24, 39, 9, 96, 2,
41 	0, FB_VMODE_NONINTERLACED
42     }, {
43 	/* 640x480 @ 60 Hz, 31.5 kHz hsync */
44 	NULL, 60, 640, 480, 39721, 40, 24, 32, 11, 96, 2,
45 	0, FB_VMODE_NONINTERLACED
46     }, {
47 	/* 800x600 @ 56 Hz, 35.15 kHz hsync */
48 	NULL, 56, 800, 600, 27777, 128, 24, 22, 1, 72, 2,
49 	0, FB_VMODE_NONINTERLACED
50     }, {
51 	/* 1024x768 @ 87 Hz interlaced, 35.5 kHz hsync */
52 	NULL, 87, 1024, 768, 22271, 56, 24, 33, 8, 160, 8,
53 	0, FB_VMODE_INTERLACED
54     }, {
55 	/* 640x400 @ 85 Hz, 37.86 kHz hsync */
56 	NULL, 85, 640, 400, 31746, 96, 32, 41, 1, 64, 3,
57 	FB_SYNC_VERT_HIGH_ACT, FB_VMODE_NONINTERLACED
58     }, {
59 	/* 640x480 @ 72 Hz, 36.5 kHz hsync */
60 	NULL, 72, 640, 480, 31746, 144, 40, 30, 8, 40, 3,
61 	0, FB_VMODE_NONINTERLACED
62     }, {
63 	/* 640x480 @ 75 Hz, 37.50 kHz hsync */
64 	NULL, 75, 640, 480, 31746, 120, 16, 16, 1, 64, 3,
65 	0, FB_VMODE_NONINTERLACED
66     }, {
67 	/* 800x600 @ 60 Hz, 37.8 kHz hsync */
68 	NULL, 60, 800, 600, 25000, 88, 40, 23, 1, 128, 4,
69 	FB_SYNC_HOR_HIGH_ACT|FB_SYNC_VERT_HIGH_ACT, FB_VMODE_NONINTERLACED
70     }, {
71 	/* 640x480 @ 85 Hz, 43.27 kHz hsync */
72 	NULL, 85, 640, 480, 27777, 80, 56, 25, 1, 56, 3,
73 	0, FB_VMODE_NONINTERLACED
74     }, {
75 	/* 1152x864 @ 89 Hz interlaced, 44 kHz hsync */
76 	NULL, 89, 1152, 864, 15384, 96, 16, 110, 1, 216, 10,
77 	0, FB_VMODE_INTERLACED
78     }, {
79 	/* 800x600 @ 72 Hz, 48.0 kHz hsync */
80 	NULL, 72, 800, 600, 20000, 64, 56, 23, 37, 120, 6,
81 	FB_SYNC_HOR_HIGH_ACT|FB_SYNC_VERT_HIGH_ACT, FB_VMODE_NONINTERLACED
82     }, {
83 	/* 1024x768 @ 60 Hz, 48.4 kHz hsync */
84 	NULL, 60, 1024, 768, 15384, 168, 8, 29, 3, 144, 6,
85 	0, FB_VMODE_NONINTERLACED
86     }, {
87 	/* 640x480 @ 100 Hz, 53.01 kHz hsync */
88 	NULL, 100, 640, 480, 21834, 96, 32, 36, 8, 96, 6,
89 	0, FB_VMODE_NONINTERLACED
90     }, {
91 	/* 1152x864 @ 60 Hz, 53.5 kHz hsync */
92 	NULL, 60, 1152, 864, 11123, 208, 64, 16, 4, 256, 8,
93 	0, FB_VMODE_NONINTERLACED
94     }, {
95 	/* 800x600 @ 85 Hz, 55.84 kHz hsync */
96 	NULL, 85, 800, 600, 16460, 160, 64, 36, 16, 64, 5,
97 	0, FB_VMODE_NONINTERLACED
98     }, {
99 	/* 1024x768 @ 70 Hz, 56.5 kHz hsync */
100 	NULL, 70, 1024, 768, 13333, 144, 24, 29, 3, 136, 6,
101 	0, FB_VMODE_NONINTERLACED
102     }, {
103 	/* 1280x1024 @ 87 Hz interlaced, 51 kHz hsync */
104 	NULL, 87, 1280, 1024, 12500, 56, 16, 128, 1, 216, 12,
105 	0, FB_VMODE_INTERLACED
106     }, {
107 	/* 800x600 @ 100 Hz, 64.02 kHz hsync */
108 	NULL, 100, 800, 600, 14357, 160, 64, 30, 4, 64, 6,
109 	0, FB_VMODE_NONINTERLACED
110     }, {
111 	/* 1024x768 @ 76 Hz, 62.5 kHz hsync */
112 	NULL, 76, 1024, 768, 11764, 208, 8, 36, 16, 120, 3,
113 	0, FB_VMODE_NONINTERLACED
114     }, {
115 	/* 1152x864 @ 70 Hz, 62.4 kHz hsync */
116 	NULL, 70, 1152, 864, 10869, 106, 56, 20, 1, 160, 10,
117 	0, FB_VMODE_NONINTERLACED
118     }, {
119 	/* 1280x1024 @ 61 Hz, 64.2 kHz hsync */
120 	NULL, 61, 1280, 1024, 9090, 200, 48, 26, 1, 184, 3,
121 	0, FB_VMODE_NONINTERLACED
122     }, {
123 	/* 1400x1050 @ 60Hz, 63.9 kHz hsync */
124 	NULL, 60, 1400, 1050, 9259, 136, 40, 13, 1, 112, 3,
125 	0, FB_VMODE_NONINTERLACED
126     }, {
127 	/* 1400x1050 @ 75,107 Hz, 82,392 kHz +hsync +vsync*/
128 	NULL, 75, 1400, 1050, 7190, 120, 56, 23, 10, 112, 13,
129 	FB_SYNC_HOR_HIGH_ACT|FB_SYNC_VERT_HIGH_ACT, FB_VMODE_NONINTERLACED
130     }, {
131 	/* 1400x1050 @ 60 Hz, ? kHz +hsync +vsync*/
132         NULL, 60, 1400, 1050, 9259, 128, 40, 12, 0, 112, 3,
133 	FB_SYNC_HOR_HIGH_ACT|FB_SYNC_VERT_HIGH_ACT, FB_VMODE_NONINTERLACED
134     }, {
135 	/* 1024x768 @ 85 Hz, 70.24 kHz hsync */
136 	NULL, 85, 1024, 768, 10111, 192, 32, 34, 14, 160, 6,
137 	0, FB_VMODE_NONINTERLACED
138     }, {
139 	/* 1152x864 @ 78 Hz, 70.8 kHz hsync */
140 	NULL, 78, 1152, 864, 9090, 228, 88, 32, 0, 84, 12,
141 	0, FB_VMODE_NONINTERLACED
142     }, {
143 	/* 1280x1024 @ 70 Hz, 74.59 kHz hsync */
144 	NULL, 70, 1280, 1024, 7905, 224, 32, 28, 8, 160, 8,
145 	0, FB_VMODE_NONINTERLACED
146     }, {
147 	/* 1600x1200 @ 60Hz, 75.00 kHz hsync */
148 	NULL, 60, 1600, 1200, 6172, 304, 64, 46, 1, 192, 3,
149 	FB_SYNC_HOR_HIGH_ACT|FB_SYNC_VERT_HIGH_ACT, FB_VMODE_NONINTERLACED
150     }, {
151 	/* 1152x864 @ 84 Hz, 76.0 kHz hsync */
152 	NULL, 84, 1152, 864, 7407, 184, 312, 32, 0, 128, 12,
153 	0, FB_VMODE_NONINTERLACED
154     }, {
155 	/* 1280x1024 @ 74 Hz, 78.85 kHz hsync */
156 	NULL, 74, 1280, 1024, 7407, 256, 32, 34, 3, 144, 3,
157 	0, FB_VMODE_NONINTERLACED
158     }, {
159 	/* 1024x768 @ 100Hz, 80.21 kHz hsync */
160 	NULL, 100, 1024, 768, 8658, 192, 32, 21, 3, 192, 10,
161 	0, FB_VMODE_NONINTERLACED
162     }, {
163 	/* 1280x1024 @ 76 Hz, 81.13 kHz hsync */
164 	NULL, 76, 1280, 1024, 7407, 248, 32, 34, 3, 104, 3,
165 	0, FB_VMODE_NONINTERLACED
166     }, {
167 	/* 1600x1200 @ 70 Hz, 87.50 kHz hsync */
168 	NULL, 70, 1600, 1200, 5291, 304, 64, 46, 1, 192, 3,
169 	0, FB_VMODE_NONINTERLACED
170     }, {
171 	/* 1152x864 @ 100 Hz, 89.62 kHz hsync */
172 	NULL, 100, 1152, 864, 7264, 224, 32, 17, 2, 128, 19,
173 	0, FB_VMODE_NONINTERLACED
174     }, {
175 	/* 1280x1024 @ 85 Hz, 91.15 kHz hsync */
176 	NULL, 85, 1280, 1024, 6349, 224, 64, 44, 1, 160, 3,
177 	FB_SYNC_HOR_HIGH_ACT|FB_SYNC_VERT_HIGH_ACT, FB_VMODE_NONINTERLACED
178     }, {
179 	/* 1600x1200 @ 75 Hz, 93.75 kHz hsync */
180 	NULL, 75, 1600, 1200, 4938, 304, 64, 46, 1, 192, 3,
181 	FB_SYNC_HOR_HIGH_ACT|FB_SYNC_VERT_HIGH_ACT, FB_VMODE_NONINTERLACED
182     }, {
183 	/* 1680x1050 @ 60 Hz, 65.191 kHz hsync */
184 	NULL, 60, 1680, 1050, 6848, 280, 104, 30, 3, 176, 6,
185 	FB_SYNC_HOR_HIGH_ACT|FB_SYNC_VERT_HIGH_ACT, FB_VMODE_NONINTERLACED
186     }, {
187 	/* 1600x1200 @ 85 Hz, 105.77 kHz hsync */
188 	NULL, 85, 1600, 1200, 4545, 272, 16, 37, 4, 192, 3,
189 	FB_SYNC_HOR_HIGH_ACT|FB_SYNC_VERT_HIGH_ACT, FB_VMODE_NONINTERLACED
190     }, {
191 	/* 1280x1024 @ 100 Hz, 107.16 kHz hsync */
192 	NULL, 100, 1280, 1024, 5502, 256, 32, 26, 7, 128, 15,
193 	0, FB_VMODE_NONINTERLACED
194     }, {
195 	/* 1800x1440 @ 64Hz, 96.15 kHz hsync  */
196 	NULL, 64, 1800, 1440, 4347, 304, 96, 46, 1, 192, 3,
197 	FB_SYNC_HOR_HIGH_ACT|FB_SYNC_VERT_HIGH_ACT, FB_VMODE_NONINTERLACED
198     }, {
199 	/* 1800x1440 @ 70Hz, 104.52 kHz hsync  */
200 	NULL, 70, 1800, 1440, 4000, 304, 96, 46, 1, 192, 3,
201 	FB_SYNC_HOR_HIGH_ACT|FB_SYNC_VERT_HIGH_ACT, FB_VMODE_NONINTERLACED
202     }, {
203 	/* 512x384 @ 78 Hz, 31.50 kHz hsync */
204 	NULL, 78, 512, 384, 49603, 48, 16, 16, 1, 64, 3,
205 	0, FB_VMODE_NONINTERLACED
206     }, {
207 	/* 512x384 @ 85 Hz, 34.38 kHz hsync */
208 	NULL, 85, 512, 384, 45454, 48, 16, 16, 1, 64, 3,
209 	0, FB_VMODE_NONINTERLACED
210     }, {
211 	/* 320x200 @ 70 Hz, 31.5 kHz hsync, 8:5 aspect ratio */
212 	NULL, 70, 320, 200, 79440, 16, 16, 20, 4, 48, 1,
213 	0, FB_VMODE_DOUBLE
214     }, {
215 	/* 320x240 @ 60 Hz, 31.5 kHz hsync, 4:3 aspect ratio */
216 	NULL, 60, 320, 240, 79440, 16, 16, 16, 5, 48, 1,
217 	0, FB_VMODE_DOUBLE
218     }, {
219 	/* 320x240 @ 72 Hz, 36.5 kHz hsync */
220 	NULL, 72, 320, 240, 63492, 16, 16, 16, 4, 48, 2,
221 	0, FB_VMODE_DOUBLE
222     }, {
223 	/* 400x300 @ 56 Hz, 35.2 kHz hsync, 4:3 aspect ratio */
224 	NULL, 56, 400, 300, 55555, 64, 16, 10, 1, 32, 1,
225 	0, FB_VMODE_DOUBLE
226     }, {
227 	/* 400x300 @ 60 Hz, 37.8 kHz hsync */
228 	NULL, 60, 400, 300, 50000, 48, 16, 11, 1, 64, 2,
229 	0, FB_VMODE_DOUBLE
230     }, {
231 	/* 400x300 @ 72 Hz, 48.0 kHz hsync */
232 	NULL, 72, 400, 300, 40000, 32, 24, 11, 19, 64, 3,
233 	0, FB_VMODE_DOUBLE
234     }, {
235 	/* 480x300 @ 56 Hz, 35.2 kHz hsync, 8:5 aspect ratio */
236 	NULL, 56, 480, 300, 46176, 80, 16, 10, 1, 40, 1,
237 	0, FB_VMODE_DOUBLE
238     }, {
239 	/* 480x300 @ 60 Hz, 37.8 kHz hsync */
240 	NULL, 60, 480, 300, 41858, 56, 16, 11, 1, 80, 2,
241 	0, FB_VMODE_DOUBLE
242     }, {
243 	/* 480x300 @ 63 Hz, 39.6 kHz hsync */
244 	NULL, 63, 480, 300, 40000, 56, 16, 11, 1, 80, 2,
245 	0, FB_VMODE_DOUBLE
246     }, {
247 	/* 480x300 @ 72 Hz, 48.0 kHz hsync */
248 	NULL, 72, 480, 300, 33386, 40, 24, 11, 19, 80, 3,
249 	0, FB_VMODE_DOUBLE
250     }, {
251 	/* 1920x1200 @ 60 Hz, 74.5 Khz hsync */
252 	NULL, 60, 1920, 1200, 5177, 128, 336, 1, 38, 208, 3,
253 	FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
254 	FB_VMODE_NONINTERLACED
255     }, {
256 	/* 1152x768, 60 Hz, PowerBook G4 Titanium I and II */
257 	NULL, 60, 1152, 768, 14047, 158, 26, 29, 3, 136, 6,
258 	FB_SYNC_HOR_HIGH_ACT|FB_SYNC_VERT_HIGH_ACT, FB_VMODE_NONINTERLACED
259     }, {
260 	/* 1366x768, 60 Hz, 47.403 kHz hsync, WXGA 16:9 aspect ratio */
261 	NULL, 60, 1366, 768, 13806, 120, 10, 14, 3, 32, 5,
262 	0, FB_VMODE_NONINTERLACED
263    }, {
264 	/* 1280x800, 60 Hz, 47.403 kHz hsync, WXGA 16:10 aspect ratio */
265 	NULL, 60, 1280, 800, 12048, 200, 64, 24, 1, 136, 3,
266 	0, FB_VMODE_NONINTERLACED
267     },
268 };
269 
270 #ifdef CONFIG_FB_MODE_HELPERS
271 const struct fb_videomode vesa_modes[] = {
272 	/* 0 640x350-85 VESA */
273 	{ NULL, 85, 640, 350, 31746,  96, 32, 60, 32, 64, 3,
274 	  FB_SYNC_HOR_HIGH_ACT, FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA},
275 	/* 1 640x400-85 VESA */
276 	{ NULL, 85, 640, 400, 31746,  96, 32, 41, 01, 64, 3,
277 	  FB_SYNC_VERT_HIGH_ACT, FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
278 	/* 2 720x400-85 VESA */
279 	{ NULL, 85, 721, 400, 28169, 108, 36, 42, 01, 72, 3,
280 	  FB_SYNC_VERT_HIGH_ACT, FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
281 	/* 3 640x480-60 VESA */
282 	{ NULL, 60, 640, 480, 39682,  48, 16, 33, 10, 96, 2,
283 	  0, FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
284 	/* 4 640x480-72 VESA */
285 	{ NULL, 72, 640, 480, 31746, 128, 24, 29, 9, 40, 2,
286 	  0, FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
287 	/* 5 640x480-75 VESA */
288 	{ NULL, 75, 640, 480, 31746, 120, 16, 16, 01, 64, 3,
289 	  0, FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
290 	/* 6 640x480-85 VESA */
291 	{ NULL, 85, 640, 480, 27777, 80, 56, 25, 01, 56, 3,
292 	  0, FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
293 	/* 7 800x600-56 VESA */
294 	{ NULL, 56, 800, 600, 27777, 128, 24, 22, 01, 72, 2,
295 	  FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
296 	  FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
297 	/* 8 800x600-60 VESA */
298 	{ NULL, 60, 800, 600, 25000, 88, 40, 23, 01, 128, 4,
299 	  FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
300 	  FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
301 	/* 9 800x600-72 VESA */
302 	{ NULL, 72, 800, 600, 20000, 64, 56, 23, 37, 120, 6,
303 	  FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
304 	  FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
305 	/* 10 800x600-75 VESA */
306 	{ NULL, 75, 800, 600, 20202, 160, 16, 21, 01, 80, 3,
307 	  FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
308 	  FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
309 	/* 11 800x600-85 VESA */
310 	{ NULL, 85, 800, 600, 17761, 152, 32, 27, 01, 64, 3,
311 	  FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
312 	  FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
313         /* 12 1024x768i-43 VESA */
314 	{ NULL, 43, 1024, 768, 22271, 56, 8, 41, 0, 176, 8,
315 	  FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
316 	  FB_VMODE_INTERLACED, FB_MODE_IS_VESA },
317 	/* 13 1024x768-60 VESA */
318 	{ NULL, 60, 1024, 768, 15384, 160, 24, 29, 3, 136, 6,
319 	  0, FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
320 	/* 14 1024x768-70 VESA */
321 	{ NULL, 70, 1024, 768, 13333, 144, 24, 29, 3, 136, 6,
322 	  0, FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
323 	/* 15 1024x768-75 VESA */
324 	{ NULL, 75, 1024, 768, 12690, 176, 16, 28, 1, 96, 3,
325 	  FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
326 	  FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
327 	/* 16 1024x768-85 VESA */
328 	{ NULL, 85, 1024, 768, 10582, 208, 48, 36, 1, 96, 3,
329 	  FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
330 	  FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
331 	/* 17 1152x864-75 VESA */
332 	{ NULL, 75, 1152, 864, 9259, 256, 64, 32, 1, 128, 3,
333 	  FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
334 	  FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
335 	/* 18 1280x960-60 VESA */
336 	{ NULL, 60, 1280, 960, 9259, 312, 96, 36, 1, 112, 3,
337 	  FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
338 	  FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
339 	/* 19 1280x960-85 VESA */
340 	{ NULL, 85, 1280, 960, 6734, 224, 64, 47, 1, 160, 3,
341 	  FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
342 	  FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
343 	/* 20 1280x1024-60 VESA */
344 	{ NULL, 60, 1280, 1024, 9259, 248, 48, 38, 1, 112, 3,
345 	  FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
346 	  FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
347 	/* 21 1280x1024-75 VESA */
348 	{ NULL, 75, 1280, 1024, 7407, 248, 16, 38, 1, 144, 3,
349 	  FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
350 	  FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
351 	/* 22 1280x1024-85 VESA */
352 	{ NULL, 85, 1280, 1024, 6349, 224, 64, 44, 1, 160, 3,
353 	  FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
354 	  FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
355 	/* 23 1600x1200-60 VESA */
356 	{ NULL, 60, 1600, 1200, 6172, 304, 64, 46, 1, 192, 3,
357 	  FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
358 	  FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
359 	/* 24 1600x1200-65 VESA */
360 	{ NULL, 65, 1600, 1200, 5698, 304,  64, 46, 1, 192, 3,
361 	  FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
362 	  FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
363 	/* 25 1600x1200-70 VESA */
364 	{ NULL, 70, 1600, 1200, 5291, 304, 64, 46, 1, 192, 3,
365 	  FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
366 	  FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
367 	/* 26 1600x1200-75 VESA */
368 	{ NULL, 75, 1600, 1200, 4938, 304, 64, 46, 1, 192, 3,
369 	  FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
370 	  FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
371 	/* 27 1600x1200-85 VESA */
372 	{ NULL, 85, 1600, 1200, 4357, 304, 64, 46, 1, 192, 3,
373 	  FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
374 	  FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
375 	/* 28 1792x1344-60 VESA */
376 	{ NULL, 60, 1792, 1344, 4882, 328, 128, 46, 1, 200, 3,
377 	  FB_SYNC_VERT_HIGH_ACT, FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
378 	/* 29 1792x1344-75 VESA */
379 	{ NULL, 75, 1792, 1344, 3831, 352, 96, 69, 1, 216, 3,
380 	  FB_SYNC_VERT_HIGH_ACT, FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
381 	/* 30 1856x1392-60 VESA */
382 	{ NULL, 60, 1856, 1392, 4580, 352, 96, 43, 1, 224, 3,
383 	  FB_SYNC_VERT_HIGH_ACT, FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
384 	/* 31 1856x1392-75 VESA */
385 	{ NULL, 75, 1856, 1392, 3472, 352, 128, 104, 1, 224, 3,
386 	  FB_SYNC_VERT_HIGH_ACT, FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
387 	/* 32 1920x1440-60 VESA */
388 	{ NULL, 60, 1920, 1440, 4273, 344, 128, 56, 1, 200, 3,
389 	  FB_SYNC_VERT_HIGH_ACT, FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
390 	/* 33 1920x1440-75 VESA */
391 	{ NULL, 75, 1920, 1440, 3367, 352, 144, 56, 1, 224, 3,
392 	  FB_SYNC_VERT_HIGH_ACT, FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
393 };
394 EXPORT_SYMBOL(vesa_modes);
395 #endif /* CONFIG_FB_MODE_HELPERS */
396 
my_atoi(const char * name)397 static int my_atoi(const char *name)
398 {
399     int val = 0;
400 
401     for (;; name++) {
402 	switch (*name) {
403 	    case '0' ... '9':
404 		val = 10*val+(*name-'0');
405 		break;
406 	    default:
407 		return val;
408 	}
409     }
410 }
411 
412 /**
413  *	fb_try_mode - test a video mode
414  *	@var: frame buffer user defined part of display
415  *	@info: frame buffer info structure
416  *	@mode: frame buffer video mode structure
417  *	@bpp: color depth in bits per pixel
418  *
419  *	Tries a video mode to test it's validity for device @info.
420  *
421  *	Returns 1 on success.
422  *
423  */
424 
fb_try_mode(struct fb_var_screeninfo * var,struct fb_info * info,const struct fb_videomode * mode,unsigned int bpp)425 static int fb_try_mode(struct fb_var_screeninfo *var, struct fb_info *info,
426 		       const struct fb_videomode *mode, unsigned int bpp)
427 {
428     int err = 0;
429 
430     DPRINTK("Trying mode %s %dx%d-%d@%d\n", mode->name ? mode->name : "noname",
431 	    mode->xres, mode->yres, bpp, mode->refresh);
432     var->xres = mode->xres;
433     var->yres = mode->yres;
434     var->xres_virtual = mode->xres;
435     var->yres_virtual = mode->yres;
436     var->xoffset = 0;
437     var->yoffset = 0;
438     var->bits_per_pixel = bpp;
439     var->activate |= FB_ACTIVATE_TEST;
440     var->pixclock = mode->pixclock;
441     var->left_margin = mode->left_margin;
442     var->right_margin = mode->right_margin;
443     var->upper_margin = mode->upper_margin;
444     var->lower_margin = mode->lower_margin;
445     var->hsync_len = mode->hsync_len;
446     var->vsync_len = mode->vsync_len;
447     var->sync = mode->sync;
448     var->vmode = mode->vmode;
449     if (info->fbops->fb_check_var)
450     	err = info->fbops->fb_check_var(var, info);
451     var->activate &= ~FB_ACTIVATE_TEST;
452     return err;
453 }
454 
455 /**
456  *	fb_find_mode - finds a valid video mode
457  *	@var: frame buffer user defined part of display
458  *	@info: frame buffer info structure
459  *	@mode_option: string video mode to find
460  *	@db: video mode database
461  *	@dbsize: size of @db
462  *	@default_mode: default video mode to fall back to
463  *	@default_bpp: default color depth in bits per pixel
464  *
465  *	Finds a suitable video mode, starting with the specified mode
466  *	in @mode_option with fallback to @default_mode.  If
467  *	@default_mode fails, all modes in the video mode database will
468  *	be tried.
469  *
470  *	Valid mode specifiers for @mode_option:
471  *
472  *	<xres>x<yres>[M][R][-<bpp>][@<refresh>][i][m] or
473  *	<name>[-<bpp>][@<refresh>]
474  *
475  *	with <xres>, <yres>, <bpp> and <refresh> decimal numbers and
476  *	<name> a string.
477  *
478  *      If 'M' is present after yres (and before refresh/bpp if present),
479  *      the function will compute the timings using VESA(tm) Coordinated
480  *      Video Timings (CVT).  If 'R' is present after 'M', will compute with
481  *      reduced blanking (for flatpanels).  If 'i' is present, compute
482  *      interlaced mode.  If 'm' is present, add margins equal to 1.8%
483  *      of xres rounded down to 8 pixels, and 1.8% of yres. The char
484  *      'i' and 'm' must be after 'M' and 'R'. Example:
485  *
486  *      1024x768MR-8@60m - Reduced blank with margins at 60Hz.
487  *
488  *	NOTE: The passed struct @var is _not_ cleared!  This allows you
489  *	to supply values for e.g. the grayscale and accel_flags fields.
490  *
491  *	Returns zero for failure, 1 if using specified @mode_option,
492  *	2 if using specified @mode_option with an ignored refresh rate,
493  *	3 if default mode is used, 4 if fall back to any valid mode.
494  *
495  */
496 
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)497 int fb_find_mode(struct fb_var_screeninfo *var,
498 		 struct fb_info *info, const char *mode_option,
499 		 const struct fb_videomode *db, unsigned int dbsize,
500 		 const struct fb_videomode *default_mode,
501 		 unsigned int default_bpp)
502 {
503     int i;
504 
505     /* Set up defaults */
506     if (!db) {
507 	db = modedb;
508 	dbsize = ARRAY_SIZE(modedb);
509     }
510 
511     if (!default_mode)
512 	default_mode = &db[0];
513 
514     if (!default_bpp)
515 	default_bpp = 8;
516 
517     /* Did the user specify a video mode? */
518     if (!mode_option)
519 	mode_option = fb_mode_option;
520     if (mode_option) {
521 	const char *name = mode_option;
522 	unsigned int namelen = strlen(name);
523 	int res_specified = 0, bpp_specified = 0, refresh_specified = 0;
524 	unsigned int xres = 0, yres = 0, bpp = default_bpp, refresh = 0;
525 	int yres_specified = 0, cvt = 0, rb = 0, interlace = 0, margins = 0;
526 	u32 best, diff, tdiff;
527 
528 	for (i = namelen-1; i >= 0; i--) {
529 	    switch (name[i]) {
530 		case '@':
531 		    namelen = i;
532 		    if (!refresh_specified && !bpp_specified &&
533 			!yres_specified) {
534 			refresh = my_atoi(&name[i+1]);
535 			refresh_specified = 1;
536 			if (cvt || rb)
537 			    cvt = 0;
538 		    } else
539 			goto done;
540 		    break;
541 		case '-':
542 		    namelen = i;
543 		    if (!bpp_specified && !yres_specified) {
544 			bpp = my_atoi(&name[i+1]);
545 			bpp_specified = 1;
546 			if (cvt || rb)
547 			    cvt = 0;
548 		    } else
549 			goto done;
550 		    break;
551 		case 'x':
552 		    if (!yres_specified) {
553 			yres = my_atoi(&name[i+1]);
554 			yres_specified = 1;
555 		    } else
556 			goto done;
557 		    break;
558 		case '0' ... '9':
559 		    break;
560 		case 'M':
561 		    if (!yres_specified)
562 			cvt = 1;
563 		    break;
564 		case 'R':
565 		    if (!cvt)
566 			rb = 1;
567 		    break;
568 		case 'm':
569 		    if (!cvt)
570 			margins = 1;
571 		    break;
572 		case 'i':
573 		    if (!cvt)
574 			interlace = 1;
575 		    break;
576 		default:
577 		    goto done;
578 	    }
579 	}
580 	if (i < 0 && yres_specified) {
581 	    xres = my_atoi(name);
582 	    res_specified = 1;
583 	}
584 done:
585 	if (cvt) {
586 	    struct fb_videomode cvt_mode;
587 	    int ret;
588 
589 	    DPRINTK("CVT mode %dx%d@%dHz%s%s%s\n", xres, yres,
590 		    (refresh) ? refresh : 60, (rb) ? " reduced blanking" :
591 		    "", (margins) ? " with margins" : "", (interlace) ?
592 		    " interlaced" : "");
593 
594 	    memset(&cvt_mode, 0, sizeof(cvt_mode));
595 	    cvt_mode.xres = xres;
596 	    cvt_mode.yres = yres;
597 	    cvt_mode.refresh = (refresh) ? refresh : 60;
598 
599 	    if (interlace)
600 		cvt_mode.vmode |= FB_VMODE_INTERLACED;
601 	    else
602 		cvt_mode.vmode &= ~FB_VMODE_INTERLACED;
603 
604 	    ret = fb_find_mode_cvt(&cvt_mode, margins, rb);
605 
606 	    if (!ret && !fb_try_mode(var, info, &cvt_mode, bpp)) {
607 		DPRINTK("modedb CVT: CVT mode ok\n");
608 		return 1;
609 	    }
610 
611 	    DPRINTK("CVT mode invalid, getting mode from database\n");
612 	}
613 
614 	DPRINTK("Trying specified video mode%s %ix%i\n",
615 	    refresh_specified ? "" : " (ignoring refresh rate)", xres, yres);
616 
617 	if (!refresh_specified) {
618 		/*
619 		 * If the caller has provided a custom mode database and a
620 		 * valid monspecs structure, we look for the mode with the
621 		 * highest refresh rate.  Otherwise we play it safe it and
622 		 * try to find a mode with a refresh rate closest to the
623 		 * standard 60 Hz.
624 		 */
625 		if (db != modedb &&
626 		    info->monspecs.vfmin && info->monspecs.vfmax &&
627 		    info->monspecs.hfmin && info->monspecs.hfmax &&
628 		    info->monspecs.dclkmax) {
629 			refresh = 1000;
630 		} else {
631 			refresh = 60;
632 		}
633 	}
634 
635 	diff = -1;
636 	best = -1;
637 	for (i = 0; i < dbsize; i++) {
638 		if ((name_matches(db[i], name, namelen) ||
639 		    (res_specified && res_matches(db[i], xres, yres))) &&
640 		    !fb_try_mode(var, info, &db[i], bpp)) {
641 			if (refresh_specified && db[i].refresh == refresh) {
642 				return 1;
643 			} else {
644 				if (abs(db[i].refresh - refresh) < diff) {
645 					diff = abs(db[i].refresh - refresh);
646 					best = i;
647 				}
648 			}
649 		}
650 	}
651 	if (best != -1) {
652 		fb_try_mode(var, info, &db[best], bpp);
653 		return (refresh_specified) ? 2 : 1;
654 	}
655 
656 	diff = 2 * (xres + yres);
657 	best = -1;
658 	DPRINTK("Trying best-fit modes\n");
659 	for (i = 0; i < dbsize; i++) {
660 		DPRINTK("Trying %ix%i\n", db[i].xres, db[i].yres);
661 		if (!fb_try_mode(var, info, &db[i], bpp)) {
662 			tdiff = abs(db[i].xres - xres) +
663 				abs(db[i].yres - yres);
664 
665 			/*
666 			 * Penalize modes with resolutions smaller
667 			 * than requested.
668 			 */
669 			if (xres > db[i].xres || yres > db[i].yres)
670 				tdiff += xres + yres;
671 
672 			if (diff > tdiff) {
673 				diff = tdiff;
674 				best = i;
675 			}
676 		}
677 	}
678 	if (best != -1) {
679 	    fb_try_mode(var, info, &db[best], bpp);
680 	    return 5;
681 	}
682     }
683 
684     DPRINTK("Trying default video mode\n");
685     if (!fb_try_mode(var, info, default_mode, default_bpp))
686 	return 3;
687 
688     DPRINTK("Trying all modes\n");
689     for (i = 0; i < dbsize; i++)
690 	if (!fb_try_mode(var, info, &db[i], default_bpp))
691 	    return 4;
692 
693     DPRINTK("No valid mode found\n");
694     return 0;
695 }
696 
697 /**
698  * fb_var_to_videomode - convert fb_var_screeninfo to fb_videomode
699  * @mode: pointer to struct fb_videomode
700  * @var: pointer to struct fb_var_screeninfo
701  */
fb_var_to_videomode(struct fb_videomode * mode,const struct fb_var_screeninfo * var)702 void fb_var_to_videomode(struct fb_videomode *mode,
703 			 const struct fb_var_screeninfo *var)
704 {
705 	u32 pixclock, hfreq, htotal, vtotal;
706 
707 	mode->name = NULL;
708 	mode->xres = var->xres;
709 	mode->yres = var->yres;
710 	mode->pixclock = var->pixclock;
711 	mode->hsync_len = var->hsync_len;
712 	mode->vsync_len = var->vsync_len;
713 	mode->left_margin = var->left_margin;
714 	mode->right_margin = var->right_margin;
715 	mode->upper_margin = var->upper_margin;
716 	mode->lower_margin = var->lower_margin;
717 	mode->sync = var->sync;
718 	mode->vmode = var->vmode & FB_VMODE_MASK;
719 	mode->flag = FB_MODE_IS_FROM_VAR;
720 	mode->refresh = 0;
721 
722 	if (!var->pixclock)
723 		return;
724 
725 	pixclock = PICOS2KHZ(var->pixclock) * 1000;
726 
727 	htotal = var->xres + var->right_margin + var->hsync_len +
728 		var->left_margin;
729 	vtotal = var->yres + var->lower_margin + var->vsync_len +
730 		var->upper_margin;
731 
732 	if (var->vmode & FB_VMODE_INTERLACED)
733 		vtotal /= 2;
734 	if (var->vmode & FB_VMODE_DOUBLE)
735 		vtotal *= 2;
736 
737 	hfreq = pixclock/htotal;
738 	mode->refresh = hfreq/vtotal;
739 }
740 
741 /**
742  * fb_videomode_to_var - convert fb_videomode to fb_var_screeninfo
743  * @var: pointer to struct fb_var_screeninfo
744  * @mode: pointer to struct fb_videomode
745  */
fb_videomode_to_var(struct fb_var_screeninfo * var,const struct fb_videomode * mode)746 void fb_videomode_to_var(struct fb_var_screeninfo *var,
747 			 const struct fb_videomode *mode)
748 {
749 	var->xres = mode->xres;
750 	var->yres = mode->yres;
751 	var->xres_virtual = mode->xres;
752 	var->yres_virtual = mode->yres;
753 	var->xoffset = 0;
754 	var->yoffset = 0;
755 	var->pixclock = mode->pixclock;
756 	var->left_margin = mode->left_margin;
757 	var->right_margin = mode->right_margin;
758 	var->upper_margin = mode->upper_margin;
759 	var->lower_margin = mode->lower_margin;
760 	var->hsync_len = mode->hsync_len;
761 	var->vsync_len = mode->vsync_len;
762 	var->sync = mode->sync;
763 	var->vmode = mode->vmode & FB_VMODE_MASK;
764 }
765 
766 /**
767  * fb_mode_is_equal - compare 2 videomodes
768  * @mode1: first videomode
769  * @mode2: second videomode
770  *
771  * RETURNS:
772  * 1 if equal, 0 if not
773  */
fb_mode_is_equal(const struct fb_videomode * mode1,const struct fb_videomode * mode2)774 int fb_mode_is_equal(const struct fb_videomode *mode1,
775 		     const struct fb_videomode *mode2)
776 {
777 	return (mode1->xres         == mode2->xres &&
778 		mode1->yres         == mode2->yres &&
779 		mode1->pixclock     == mode2->pixclock &&
780 		mode1->hsync_len    == mode2->hsync_len &&
781 		mode1->vsync_len    == mode2->vsync_len &&
782 		mode1->left_margin  == mode2->left_margin &&
783 		mode1->right_margin == mode2->right_margin &&
784 		mode1->upper_margin == mode2->upper_margin &&
785 		mode1->lower_margin == mode2->lower_margin &&
786 		mode1->sync         == mode2->sync &&
787 		mode1->vmode        == mode2->vmode);
788 }
789 
790 /**
791  * fb_find_best_mode - find best matching videomode
792  * @var: pointer to struct fb_var_screeninfo
793  * @head: pointer to struct list_head of modelist
794  *
795  * RETURNS:
796  * struct fb_videomode, NULL if none found
797  *
798  * IMPORTANT:
799  * This function assumes that all modelist entries in
800  * info->modelist are valid.
801  *
802  * NOTES:
803  * Finds best matching videomode which has an equal or greater dimension than
804  * var->xres and var->yres.  If more than 1 videomode is found, will return
805  * the videomode with the highest refresh rate
806  */
fb_find_best_mode(const struct fb_var_screeninfo * var,struct list_head * head)807 const struct fb_videomode *fb_find_best_mode(const struct fb_var_screeninfo *var,
808 					     struct list_head *head)
809 {
810 	struct list_head *pos;
811 	struct fb_modelist *modelist;
812 	struct fb_videomode *mode, *best = NULL;
813 	u32 diff = -1;
814 
815 	list_for_each(pos, head) {
816 		u32 d;
817 
818 		modelist = list_entry(pos, struct fb_modelist, list);
819 		mode = &modelist->mode;
820 
821 		if (mode->xres >= var->xres && mode->yres >= var->yres) {
822 			d = (mode->xres - var->xres) +
823 				(mode->yres - var->yres);
824 			if (diff > d) {
825 				diff = d;
826 				best = mode;
827 			} else if (diff == d && best &&
828 				   mode->refresh > best->refresh)
829 				best = mode;
830 		}
831 	}
832 	return best;
833 }
834 
835 /**
836  * fb_find_nearest_mode - find closest videomode
837  *
838  * @mode: pointer to struct fb_videomode
839  * @head: pointer to modelist
840  *
841  * Finds best matching videomode, smaller or greater in dimension.
842  * If more than 1 videomode is found, will return the videomode with
843  * the closest refresh rate.
844  */
fb_find_nearest_mode(const struct fb_videomode * mode,struct list_head * head)845 const struct fb_videomode *fb_find_nearest_mode(const struct fb_videomode *mode,
846 					        struct list_head *head)
847 {
848 	struct list_head *pos;
849 	struct fb_modelist *modelist;
850 	struct fb_videomode *cmode, *best = NULL;
851 	u32 diff = -1, diff_refresh = -1;
852 
853 	list_for_each(pos, head) {
854 		u32 d;
855 
856 		modelist = list_entry(pos, struct fb_modelist, list);
857 		cmode = &modelist->mode;
858 
859 		d = abs(cmode->xres - mode->xres) +
860 			abs(cmode->yres - mode->yres);
861 		if (diff > d) {
862 			diff = d;
863 			best = cmode;
864 		} else if (diff == d) {
865 			d = abs(cmode->refresh - mode->refresh);
866 			if (diff_refresh > d) {
867 				diff_refresh = d;
868 				best = cmode;
869 			}
870 		}
871 	}
872 
873 	return best;
874 }
875 
876 /**
877  * fb_match_mode - find a videomode which exactly matches the timings in var
878  * @var: pointer to struct fb_var_screeninfo
879  * @head: pointer to struct list_head of modelist
880  *
881  * RETURNS:
882  * struct fb_videomode, NULL if none found
883  */
fb_match_mode(const struct fb_var_screeninfo * var,struct list_head * head)884 const struct fb_videomode *fb_match_mode(const struct fb_var_screeninfo *var,
885 					 struct list_head *head)
886 {
887 	struct list_head *pos;
888 	struct fb_modelist *modelist;
889 	struct fb_videomode *m, mode;
890 
891 	fb_var_to_videomode(&mode, var);
892 	list_for_each(pos, head) {
893 		modelist = list_entry(pos, struct fb_modelist, list);
894 		m = &modelist->mode;
895 		if (fb_mode_is_equal(m, &mode))
896 			return m;
897 	}
898 	return NULL;
899 }
900 
901 /**
902  * fb_add_videomode: adds videomode entry to modelist
903  * @mode: videomode to add
904  * @head: struct list_head of modelist
905  *
906  * NOTES:
907  * Will only add unmatched mode entries
908  */
fb_add_videomode(const struct fb_videomode * mode,struct list_head * head)909 int fb_add_videomode(const struct fb_videomode *mode, struct list_head *head)
910 {
911 	struct list_head *pos;
912 	struct fb_modelist *modelist;
913 	struct fb_videomode *m;
914 	int found = 0;
915 
916 	list_for_each(pos, head) {
917 		modelist = list_entry(pos, struct fb_modelist, list);
918 		m = &modelist->mode;
919 		if (fb_mode_is_equal(m, mode)) {
920 			found = 1;
921 			break;
922 		}
923 	}
924 	if (!found) {
925 		modelist = kmalloc(sizeof(struct fb_modelist),
926 						  GFP_KERNEL);
927 
928 		if (!modelist)
929 			return -ENOMEM;
930 		modelist->mode = *mode;
931 		list_add(&modelist->list, head);
932 	}
933 	return 0;
934 }
935 
936 /**
937  * fb_delete_videomode: removed videomode entry from modelist
938  * @mode: videomode to remove
939  * @head: struct list_head of modelist
940  *
941  * NOTES:
942  * Will remove all matching mode entries
943  */
fb_delete_videomode(const struct fb_videomode * mode,struct list_head * head)944 void fb_delete_videomode(const struct fb_videomode *mode,
945 			 struct list_head *head)
946 {
947 	struct list_head *pos, *n;
948 	struct fb_modelist *modelist;
949 	struct fb_videomode *m;
950 
951 	list_for_each_safe(pos, n, head) {
952 		modelist = list_entry(pos, struct fb_modelist, list);
953 		m = &modelist->mode;
954 		if (fb_mode_is_equal(m, mode)) {
955 			list_del(pos);
956 			kfree(pos);
957 		}
958 	}
959 }
960 
961 /**
962  * fb_destroy_modelist: destroy modelist
963  * @head: struct list_head of modelist
964  */
fb_destroy_modelist(struct list_head * head)965 void fb_destroy_modelist(struct list_head *head)
966 {
967 	struct list_head *pos, *n;
968 
969 	list_for_each_safe(pos, n, head) {
970 		list_del(pos);
971 		kfree(pos);
972 	}
973 }
974 EXPORT_SYMBOL_GPL(fb_destroy_modelist);
975 
976 /**
977  * fb_videomode_to_modelist: convert mode array to mode list
978  * @modedb: array of struct fb_videomode
979  * @num: number of entries in array
980  * @head: struct list_head of modelist
981  */
fb_videomode_to_modelist(const struct fb_videomode * modedb,int num,struct list_head * head)982 void fb_videomode_to_modelist(const struct fb_videomode *modedb, int num,
983 			      struct list_head *head)
984 {
985 	int i;
986 
987 	INIT_LIST_HEAD(head);
988 
989 	for (i = 0; i < num; i++) {
990 		if (fb_add_videomode(&modedb[i], head))
991 			return;
992 	}
993 }
994 
fb_find_best_display(const struct fb_monspecs * specs,struct list_head * head)995 const struct fb_videomode *fb_find_best_display(const struct fb_monspecs *specs,
996 					        struct list_head *head)
997 {
998 	struct list_head *pos;
999 	struct fb_modelist *modelist;
1000 	const struct fb_videomode *m, *m1 = NULL, *md = NULL, *best = NULL;
1001 	int first = 0;
1002 
1003 	if (!head->prev || !head->next || list_empty(head))
1004 		goto finished;
1005 
1006 	/* get the first detailed mode and the very first mode */
1007 	list_for_each(pos, head) {
1008 		modelist = list_entry(pos, struct fb_modelist, list);
1009 		m = &modelist->mode;
1010 
1011 		if (!first) {
1012 			m1 = m;
1013 			first = 1;
1014 		}
1015 
1016 		if (m->flag & FB_MODE_IS_FIRST) {
1017  			md = m;
1018 			break;
1019 		}
1020 	}
1021 
1022 	/* first detailed timing is preferred */
1023 	if (specs->misc & FB_MISC_1ST_DETAIL) {
1024 		best = md;
1025 		goto finished;
1026 	}
1027 
1028 	/* find best mode based on display width and height */
1029 	if (specs->max_x && specs->max_y) {
1030 		struct fb_var_screeninfo var;
1031 
1032 		memset(&var, 0, sizeof(struct fb_var_screeninfo));
1033 		var.xres = (specs->max_x * 7200)/254;
1034 		var.yres = (specs->max_y * 7200)/254;
1035 		m = fb_find_best_mode(&var, head);
1036 		if (m) {
1037 			best = m;
1038 			goto finished;
1039 		}
1040 	}
1041 
1042 	/* use first detailed mode */
1043 	if (md) {
1044 		best = md;
1045 		goto finished;
1046 	}
1047 
1048 	/* last resort, use the very first mode */
1049 	best = m1;
1050 finished:
1051 	return best;
1052 }
1053 EXPORT_SYMBOL(fb_find_best_display);
1054 
1055 EXPORT_SYMBOL(fb_videomode_to_var);
1056 EXPORT_SYMBOL(fb_var_to_videomode);
1057 EXPORT_SYMBOL(fb_mode_is_equal);
1058 EXPORT_SYMBOL(fb_add_videomode);
1059 EXPORT_SYMBOL(fb_match_mode);
1060 EXPORT_SYMBOL(fb_find_best_mode);
1061 EXPORT_SYMBOL(fb_find_nearest_mode);
1062 EXPORT_SYMBOL(fb_videomode_to_modelist);
1063 EXPORT_SYMBOL(fb_find_mode);
1064