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0001 /*
0002  *  linux/drivers/video/modedb.c -- Standard video mode database management
0003  *
0004  *  Copyright (C) 1999 Geert Uytterhoeven
0005  *
0006  *  2001 - Documented with DocBook
0007  *  - Brad Douglas <brad@neruo.com>
0008  *
0009  *  This file is subject to the terms and conditions of the GNU General Public
0010  *  License. See the file COPYING in the main directory of this archive for
0011  *  more details.
0012  */
0013 
0014 #include <linux/module.h>
0015 #include <linux/slab.h>
0016 #include <linux/fb.h>
0017 #include <linux/kernel.h>
0018 
0019 #undef DEBUG
0020 
0021 #define name_matches(v, s, l) \
0022     ((v).name && !strncmp((s), (v).name, (l)) && strlen((v).name) == (l))
0023 #define res_matches(v, x, y) \
0024     ((v).xres == (x) && (v).yres == (y))
0025 
0026 #ifdef DEBUG
0027 #define DPRINTK(fmt, args...)   printk("modedb %s: " fmt, __func__ , ## args)
0028 #else
0029 #define DPRINTK(fmt, args...)
0030 #endif
0031 
0032 /*
0033  *  Standard video mode definitions (taken from XFree86)
0034  */
0035 
0036 static const struct fb_videomode modedb[] = {
0037 
0038     /* 640x400 @ 70 Hz, 31.5 kHz hsync */
0039     { NULL, 70, 640, 400, 39721, 40, 24, 39, 9, 96, 2, 0,
0040         FB_VMODE_NONINTERLACED },
0041 
0042     /* 640x480 @ 60 Hz, 31.5 kHz hsync */
0043     { NULL, 60, 640, 480, 39721, 40, 24, 32, 11, 96, 2, 0,
0044         FB_VMODE_NONINTERLACED },
0045 
0046     /* 800x600 @ 56 Hz, 35.15 kHz hsync */
0047     { NULL, 56, 800, 600, 27777, 128, 24, 22, 1, 72, 2, 0,
0048         FB_VMODE_NONINTERLACED },
0049 
0050     /* 1024x768 @ 87 Hz interlaced, 35.5 kHz hsync */
0051     { NULL, 87, 1024, 768, 22271, 56, 24, 33, 8, 160, 8, 0,
0052         FB_VMODE_INTERLACED },
0053 
0054     /* 640x400 @ 85 Hz, 37.86 kHz hsync */
0055     { NULL, 85, 640, 400, 31746, 96, 32, 41, 1, 64, 3,
0056         FB_SYNC_VERT_HIGH_ACT, FB_VMODE_NONINTERLACED },
0057 
0058     /* 640x480 @ 72 Hz, 36.5 kHz hsync */
0059     { NULL, 72, 640, 480, 31746, 144, 40, 30, 8, 40, 3, 0,
0060         FB_VMODE_NONINTERLACED },
0061 
0062     /* 640x480 @ 75 Hz, 37.50 kHz hsync */
0063     { NULL, 75, 640, 480, 31746, 120, 16, 16, 1, 64, 3, 0,
0064         FB_VMODE_NONINTERLACED },
0065 
0066     /* 800x600 @ 60 Hz, 37.8 kHz hsync */
0067     { NULL, 60, 800, 600, 25000, 88, 40, 23, 1, 128, 4,
0068         FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
0069         FB_VMODE_NONINTERLACED },
0070 
0071     /* 640x480 @ 85 Hz, 43.27 kHz hsync */
0072     { NULL, 85, 640, 480, 27777, 80, 56, 25, 1, 56, 3, 0,
0073         FB_VMODE_NONINTERLACED },
0074 
0075     /* 1152x864 @ 89 Hz interlaced, 44 kHz hsync */
0076     { NULL, 89, 1152, 864, 15384, 96, 16, 110, 1, 216, 10, 0,
0077         FB_VMODE_INTERLACED },
0078     /* 800x600 @ 72 Hz, 48.0 kHz hsync */
0079     { NULL, 72, 800, 600, 20000, 64, 56, 23, 37, 120, 6,
0080         FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
0081         FB_VMODE_NONINTERLACED },
0082 
0083     /* 1024x768 @ 60 Hz, 48.4 kHz hsync */
0084     { NULL, 60, 1024, 768, 15384, 168, 8, 29, 3, 144, 6, 0,
0085         FB_VMODE_NONINTERLACED },
0086 
0087     /* 640x480 @ 100 Hz, 53.01 kHz hsync */
0088     { NULL, 100, 640, 480, 21834, 96, 32, 36, 8, 96, 6, 0,
0089         FB_VMODE_NONINTERLACED },
0090 
0091     /* 1152x864 @ 60 Hz, 53.5 kHz hsync */
0092     { NULL, 60, 1152, 864, 11123, 208, 64, 16, 4, 256, 8, 0,
0093         FB_VMODE_NONINTERLACED },
0094 
0095     /* 800x600 @ 85 Hz, 55.84 kHz hsync */
0096     { NULL, 85, 800, 600, 16460, 160, 64, 36, 16, 64, 5, 0,
0097         FB_VMODE_NONINTERLACED },
0098 
0099     /* 1024x768 @ 70 Hz, 56.5 kHz hsync */
0100     { NULL, 70, 1024, 768, 13333, 144, 24, 29, 3, 136, 6, 0,
0101         FB_VMODE_NONINTERLACED },
0102 
0103     /* 1280x1024 @ 87 Hz interlaced, 51 kHz hsync */
0104     { NULL, 87, 1280, 1024, 12500, 56, 16, 128, 1, 216, 12, 0,
0105         FB_VMODE_INTERLACED },
0106 
0107     /* 800x600 @ 100 Hz, 64.02 kHz hsync */
0108     { NULL, 100, 800, 600, 14357, 160, 64, 30, 4, 64, 6, 0,
0109         FB_VMODE_NONINTERLACED },
0110 
0111     /* 1024x768 @ 76 Hz, 62.5 kHz hsync */
0112     { NULL, 76, 1024, 768, 11764, 208, 8, 36, 16, 120, 3, 0,
0113         FB_VMODE_NONINTERLACED },
0114 
0115     /* 1152x864 @ 70 Hz, 62.4 kHz hsync */
0116     { NULL, 70, 1152, 864, 10869, 106, 56, 20, 1, 160, 10, 0,
0117         FB_VMODE_NONINTERLACED },
0118 
0119     /* 1280x1024 @ 61 Hz, 64.2 kHz hsync */
0120     { NULL, 61, 1280, 1024, 9090, 200, 48, 26, 1, 184, 3, 0,
0121         FB_VMODE_NONINTERLACED },
0122 
0123     /* 1400x1050 @ 60Hz, 63.9 kHz hsync */
0124     { NULL, 60, 1400, 1050, 9259, 136, 40, 13, 1, 112, 3, 0,
0125         FB_VMODE_NONINTERLACED },
0126 
0127     /* 1400x1050 @ 75,107 Hz, 82,392 kHz +hsync +vsync*/
0128     { NULL, 75, 1400, 1050, 7190, 120, 56, 23, 10, 112, 13,
0129         FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
0130         FB_VMODE_NONINTERLACED },
0131 
0132     /* 1400x1050 @ 60 Hz, ? kHz +hsync +vsync*/
0133     { NULL, 60, 1400, 1050, 9259, 128, 40, 12, 0, 112, 3,
0134         FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
0135         FB_VMODE_NONINTERLACED },
0136 
0137     /* 1024x768 @ 85 Hz, 70.24 kHz hsync */
0138     { NULL, 85, 1024, 768, 10111, 192, 32, 34, 14, 160, 6, 0,
0139         FB_VMODE_NONINTERLACED },
0140 
0141     /* 1152x864 @ 78 Hz, 70.8 kHz hsync */
0142     { NULL, 78, 1152, 864, 9090, 228, 88, 32, 0, 84, 12, 0,
0143         FB_VMODE_NONINTERLACED },
0144 
0145     /* 1280x1024 @ 70 Hz, 74.59 kHz hsync */
0146     { NULL, 70, 1280, 1024, 7905, 224, 32, 28, 8, 160, 8, 0,
0147         FB_VMODE_NONINTERLACED },
0148 
0149     /* 1600x1200 @ 60Hz, 75.00 kHz hsync */
0150     { NULL, 60, 1600, 1200, 6172, 304, 64, 46, 1, 192, 3,
0151         FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
0152         FB_VMODE_NONINTERLACED },
0153 
0154     /* 1152x864 @ 84 Hz, 76.0 kHz hsync */
0155     { NULL, 84, 1152, 864, 7407, 184, 312, 32, 0, 128, 12, 0,
0156         FB_VMODE_NONINTERLACED },
0157 
0158     /* 1280x1024 @ 74 Hz, 78.85 kHz hsync */
0159     { NULL, 74, 1280, 1024, 7407, 256, 32, 34, 3, 144, 3, 0,
0160         FB_VMODE_NONINTERLACED },
0161 
0162     /* 1024x768 @ 100Hz, 80.21 kHz hsync */
0163     { NULL, 100, 1024, 768, 8658, 192, 32, 21, 3, 192, 10, 0,
0164         FB_VMODE_NONINTERLACED },
0165 
0166     /* 1280x1024 @ 76 Hz, 81.13 kHz hsync */
0167     { NULL, 76, 1280, 1024, 7407, 248, 32, 34, 3, 104, 3, 0,
0168         FB_VMODE_NONINTERLACED },
0169 
0170     /* 1600x1200 @ 70 Hz, 87.50 kHz hsync */
0171     { NULL, 70, 1600, 1200, 5291, 304, 64, 46, 1, 192, 3, 0,
0172         FB_VMODE_NONINTERLACED },
0173 
0174     /* 1152x864 @ 100 Hz, 89.62 kHz hsync */
0175     { NULL, 100, 1152, 864, 7264, 224, 32, 17, 2, 128, 19, 0,
0176         FB_VMODE_NONINTERLACED },
0177 
0178     /* 1280x1024 @ 85 Hz, 91.15 kHz hsync */
0179     { NULL, 85, 1280, 1024, 6349, 224, 64, 44, 1, 160, 3,
0180         FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
0181         FB_VMODE_NONINTERLACED },
0182 
0183     /* 1600x1200 @ 75 Hz, 93.75 kHz hsync */
0184     { NULL, 75, 1600, 1200, 4938, 304, 64, 46, 1, 192, 3,
0185         FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
0186         FB_VMODE_NONINTERLACED },
0187 
0188     /* 1680x1050 @ 60 Hz, 65.191 kHz hsync */
0189     { NULL, 60, 1680, 1050, 6848, 280, 104, 30, 3, 176, 6,
0190         FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
0191         FB_VMODE_NONINTERLACED },
0192 
0193     /* 1600x1200 @ 85 Hz, 105.77 kHz hsync */
0194     { NULL, 85, 1600, 1200, 4545, 272, 16, 37, 4, 192, 3,
0195         FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
0196         FB_VMODE_NONINTERLACED },
0197 
0198     /* 1280x1024 @ 100 Hz, 107.16 kHz hsync */
0199     { NULL, 100, 1280, 1024, 5502, 256, 32, 26, 7, 128, 15, 0,
0200         FB_VMODE_NONINTERLACED },
0201 
0202     /* 1800x1440 @ 64Hz, 96.15 kHz hsync  */
0203     { NULL, 64, 1800, 1440, 4347, 304, 96, 46, 1, 192, 3,
0204         FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
0205         FB_VMODE_NONINTERLACED },
0206 
0207     /* 1800x1440 @ 70Hz, 104.52 kHz hsync  */
0208     { NULL, 70, 1800, 1440, 4000, 304, 96, 46, 1, 192, 3,
0209         FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
0210         FB_VMODE_NONINTERLACED },
0211 
0212     /* 512x384 @ 78 Hz, 31.50 kHz hsync */
0213     { NULL, 78, 512, 384, 49603, 48, 16, 16, 1, 64, 3, 0,
0214         FB_VMODE_NONINTERLACED },
0215 
0216     /* 512x384 @ 85 Hz, 34.38 kHz hsync */
0217     { NULL, 85, 512, 384, 45454, 48, 16, 16, 1, 64, 3, 0,
0218         FB_VMODE_NONINTERLACED },
0219 
0220     /* 320x200 @ 70 Hz, 31.5 kHz hsync, 8:5 aspect ratio */
0221     { NULL, 70, 320, 200, 79440, 16, 16, 20, 4, 48, 1, 0,
0222         FB_VMODE_DOUBLE },
0223 
0224     /* 320x240 @ 60 Hz, 31.5 kHz hsync, 4:3 aspect ratio */
0225     { NULL, 60, 320, 240, 79440, 16, 16, 16, 5, 48, 1, 0,
0226         FB_VMODE_DOUBLE },
0227 
0228     /* 320x240 @ 72 Hz, 36.5 kHz hsync */
0229     { NULL, 72, 320, 240, 63492, 16, 16, 16, 4, 48, 2, 0,
0230         FB_VMODE_DOUBLE },
0231 
0232     /* 400x300 @ 56 Hz, 35.2 kHz hsync, 4:3 aspect ratio */
0233     { NULL, 56, 400, 300, 55555, 64, 16, 10, 1, 32, 1, 0,
0234         FB_VMODE_DOUBLE },
0235 
0236     /* 400x300 @ 60 Hz, 37.8 kHz hsync */
0237     { NULL, 60, 400, 300, 50000, 48, 16, 11, 1, 64, 2, 0,
0238         FB_VMODE_DOUBLE },
0239 
0240     /* 400x300 @ 72 Hz, 48.0 kHz hsync */
0241     { NULL, 72, 400, 300, 40000, 32, 24, 11, 19, 64, 3, 0,
0242         FB_VMODE_DOUBLE },
0243 
0244     /* 480x300 @ 56 Hz, 35.2 kHz hsync, 8:5 aspect ratio */
0245     { NULL, 56, 480, 300, 46176, 80, 16, 10, 1, 40, 1, 0,
0246         FB_VMODE_DOUBLE },
0247 
0248     /* 480x300 @ 60 Hz, 37.8 kHz hsync */
0249     { NULL, 60, 480, 300, 41858, 56, 16, 11, 1, 80, 2, 0,
0250         FB_VMODE_DOUBLE },
0251 
0252     /* 480x300 @ 63 Hz, 39.6 kHz hsync */
0253     { NULL, 63, 480, 300, 40000, 56, 16, 11, 1, 80, 2, 0,
0254         FB_VMODE_DOUBLE },
0255 
0256     /* 480x300 @ 72 Hz, 48.0 kHz hsync */
0257     { NULL, 72, 480, 300, 33386, 40, 24, 11, 19, 80, 3, 0,
0258         FB_VMODE_DOUBLE },
0259 
0260     /* 1920x1200 @ 60 Hz, 74.5 Khz hsync */
0261     { NULL, 60, 1920, 1200, 5177, 128, 336, 1, 38, 208, 3,
0262         FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
0263         FB_VMODE_NONINTERLACED },
0264 
0265     /* 1152x768, 60 Hz, PowerBook G4 Titanium I and II */
0266     { NULL, 60, 1152, 768, 14047, 158, 26, 29, 3, 136, 6,
0267         FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
0268         FB_VMODE_NONINTERLACED },
0269 
0270     /* 1366x768, 60 Hz, 47.403 kHz hsync, WXGA 16:9 aspect ratio */
0271     { NULL, 60, 1366, 768, 13806, 120, 10, 14, 3, 32, 5, 0,
0272         FB_VMODE_NONINTERLACED },
0273 
0274     /* 1280x800, 60 Hz, 47.403 kHz hsync, WXGA 16:10 aspect ratio */
0275     { NULL, 60, 1280, 800, 12048, 200, 64, 24, 1, 136, 3, 0,
0276         FB_VMODE_NONINTERLACED },
0277 
0278     /* 720x576i @ 50 Hz, 15.625 kHz hsync (PAL RGB) */
0279     { NULL, 50, 720, 576, 74074, 64, 16, 39, 5, 64, 5, 0,
0280         FB_VMODE_INTERLACED },
0281 
0282     /* 800x520i @ 50 Hz, 15.625 kHz hsync (PAL RGB) */
0283     { NULL, 50, 800, 520, 58823, 144, 64, 72, 28, 80, 5, 0,
0284         FB_VMODE_INTERLACED },
0285 
0286     /* 864x480 @ 60 Hz, 35.15 kHz hsync */
0287     { NULL, 60, 864, 480, 27777, 1, 1, 1, 1, 0, 0,
0288         0, FB_VMODE_NONINTERLACED },
0289 };
0290 
0291 #ifdef CONFIG_FB_MODE_HELPERS
0292 const struct fb_videomode vesa_modes[] = {
0293     /* 0 640x350-85 VESA */
0294     { NULL, 85, 640, 350, 31746,  96, 32, 60, 32, 64, 3,
0295       FB_SYNC_HOR_HIGH_ACT, FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA},
0296     /* 1 640x400-85 VESA */
0297     { NULL, 85, 640, 400, 31746,  96, 32, 41, 01, 64, 3,
0298       FB_SYNC_VERT_HIGH_ACT, FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
0299     /* 2 720x400-85 VESA */
0300     { NULL, 85, 721, 400, 28169, 108, 36, 42, 01, 72, 3,
0301       FB_SYNC_VERT_HIGH_ACT, FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
0302     /* 3 640x480-60 VESA */
0303     { NULL, 60, 640, 480, 39682,  48, 16, 33, 10, 96, 2,
0304       0, FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
0305     /* 4 640x480-72 VESA */
0306     { NULL, 72, 640, 480, 31746, 128, 24, 29, 9, 40, 2,
0307       0, FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
0308     /* 5 640x480-75 VESA */
0309     { NULL, 75, 640, 480, 31746, 120, 16, 16, 01, 64, 3,
0310       0, FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
0311     /* 6 640x480-85 VESA */
0312     { NULL, 85, 640, 480, 27777, 80, 56, 25, 01, 56, 3,
0313       0, FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
0314     /* 7 800x600-56 VESA */
0315     { NULL, 56, 800, 600, 27777, 128, 24, 22, 01, 72, 2,
0316       FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
0317       FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
0318     /* 8 800x600-60 VESA */
0319     { NULL, 60, 800, 600, 25000, 88, 40, 23, 01, 128, 4,
0320       FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
0321       FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
0322     /* 9 800x600-72 VESA */
0323     { NULL, 72, 800, 600, 20000, 64, 56, 23, 37, 120, 6,
0324       FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
0325       FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
0326     /* 10 800x600-75 VESA */
0327     { NULL, 75, 800, 600, 20202, 160, 16, 21, 01, 80, 3,
0328       FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
0329       FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
0330     /* 11 800x600-85 VESA */
0331     { NULL, 85, 800, 600, 17761, 152, 32, 27, 01, 64, 3,
0332       FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
0333       FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
0334         /* 12 1024x768i-43 VESA */
0335     { NULL, 43, 1024, 768, 22271, 56, 8, 41, 0, 176, 8,
0336       FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
0337       FB_VMODE_INTERLACED, FB_MODE_IS_VESA },
0338     /* 13 1024x768-60 VESA */
0339     { NULL, 60, 1024, 768, 15384, 160, 24, 29, 3, 136, 6,
0340       0, FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
0341     /* 14 1024x768-70 VESA */
0342     { NULL, 70, 1024, 768, 13333, 144, 24, 29, 3, 136, 6,
0343       0, FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
0344     /* 15 1024x768-75 VESA */
0345     { NULL, 75, 1024, 768, 12690, 176, 16, 28, 1, 96, 3,
0346       FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
0347       FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
0348     /* 16 1024x768-85 VESA */
0349     { NULL, 85, 1024, 768, 10582, 208, 48, 36, 1, 96, 3,
0350       FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
0351       FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
0352     /* 17 1152x864-75 VESA */
0353     { NULL, 75, 1152, 864, 9259, 256, 64, 32, 1, 128, 3,
0354       FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
0355       FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
0356     /* 18 1280x960-60 VESA */
0357     { NULL, 60, 1280, 960, 9259, 312, 96, 36, 1, 112, 3,
0358       FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
0359       FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
0360     /* 19 1280x960-85 VESA */
0361     { NULL, 85, 1280, 960, 6734, 224, 64, 47, 1, 160, 3,
0362       FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
0363       FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
0364     /* 20 1280x1024-60 VESA */
0365     { NULL, 60, 1280, 1024, 9259, 248, 48, 38, 1, 112, 3,
0366       FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
0367       FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
0368     /* 21 1280x1024-75 VESA */
0369     { NULL, 75, 1280, 1024, 7407, 248, 16, 38, 1, 144, 3,
0370       FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
0371       FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
0372     /* 22 1280x1024-85 VESA */
0373     { NULL, 85, 1280, 1024, 6349, 224, 64, 44, 1, 160, 3,
0374       FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
0375       FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
0376     /* 23 1600x1200-60 VESA */
0377     { NULL, 60, 1600, 1200, 6172, 304, 64, 46, 1, 192, 3,
0378       FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
0379       FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
0380     /* 24 1600x1200-65 VESA */
0381     { NULL, 65, 1600, 1200, 5698, 304,  64, 46, 1, 192, 3,
0382       FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
0383       FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
0384     /* 25 1600x1200-70 VESA */
0385     { NULL, 70, 1600, 1200, 5291, 304, 64, 46, 1, 192, 3,
0386       FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
0387       FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
0388     /* 26 1600x1200-75 VESA */
0389     { NULL, 75, 1600, 1200, 4938, 304, 64, 46, 1, 192, 3,
0390       FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
0391       FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
0392     /* 27 1600x1200-85 VESA */
0393     { NULL, 85, 1600, 1200, 4357, 304, 64, 46, 1, 192, 3,
0394       FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
0395       FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
0396     /* 28 1792x1344-60 VESA */
0397     { NULL, 60, 1792, 1344, 4882, 328, 128, 46, 1, 200, 3,
0398       FB_SYNC_VERT_HIGH_ACT, FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
0399     /* 29 1792x1344-75 VESA */
0400     { NULL, 75, 1792, 1344, 3831, 352, 96, 69, 1, 216, 3,
0401       FB_SYNC_VERT_HIGH_ACT, FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
0402     /* 30 1856x1392-60 VESA */
0403     { NULL, 60, 1856, 1392, 4580, 352, 96, 43, 1, 224, 3,
0404       FB_SYNC_VERT_HIGH_ACT, FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
0405     /* 31 1856x1392-75 VESA */
0406     { NULL, 75, 1856, 1392, 3472, 352, 128, 104, 1, 224, 3,
0407       FB_SYNC_VERT_HIGH_ACT, FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
0408     /* 32 1920x1440-60 VESA */
0409     { NULL, 60, 1920, 1440, 4273, 344, 128, 56, 1, 200, 3,
0410       FB_SYNC_VERT_HIGH_ACT, FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
0411     /* 33 1920x1440-75 VESA */
0412     { NULL, 75, 1920, 1440, 3367, 352, 144, 56, 1, 224, 3,
0413       FB_SYNC_VERT_HIGH_ACT, FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
0414     /* 34 1920x1200-60 RB VESA */
0415     { NULL, 60, 1920, 1200, 6493, 80, 48, 26, 3, 32, 6,
0416       FB_SYNC_VERT_HIGH_ACT, FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
0417     /* 35 1920x1200-60 VESA */
0418     { NULL, 60, 1920, 1200, 5174, 336, 136, 36, 3, 200, 6,
0419       FB_SYNC_VERT_HIGH_ACT, FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
0420     /* 36 1920x1200-75 VESA */
0421     { NULL, 75, 1920, 1200, 4077, 344, 136, 46, 3, 208, 6,
0422       FB_SYNC_VERT_HIGH_ACT, FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
0423     /* 37 1920x1200-85 VESA */
0424     { NULL, 85, 1920, 1200, 3555, 352, 144, 53, 3, 208, 6,
0425       FB_SYNC_VERT_HIGH_ACT, FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
0426     /* 38 2560x1600-60 RB VESA */
0427     { NULL, 60, 2560, 1600, 3724, 80, 48, 37, 3, 32, 6,
0428       FB_SYNC_HOR_HIGH_ACT, FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
0429     /* 39 2560x1600-60 VESA */
0430     { NULL, 60, 2560, 1600, 2869, 472, 192, 49, 3, 280, 6,
0431       FB_SYNC_VERT_HIGH_ACT, FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
0432     /* 40 2560x1600-75 VESA */
0433     { NULL, 75, 2560, 1600, 2256, 488, 208, 63, 3, 280, 6,
0434       FB_SYNC_VERT_HIGH_ACT, FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
0435     /* 41 2560x1600-85 VESA */
0436     { NULL, 85, 2560, 1600, 1979, 488, 208, 73, 3, 280, 6,
0437       FB_SYNC_VERT_HIGH_ACT, FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
0438     /* 42 2560x1600-120 RB VESA */
0439     { NULL, 120, 2560, 1600, 1809, 80, 48, 85, 3, 32, 6,
0440       FB_SYNC_HOR_HIGH_ACT, FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
0441 };
0442 EXPORT_SYMBOL(vesa_modes);
0443 
0444 const struct dmt_videomode dmt_modes[DMT_SIZE] = {
0445     { 0x01, 0x0000, 0x000000, &vesa_modes[0] },
0446     { 0x02, 0x3119, 0x000000, &vesa_modes[1] },
0447     { 0x03, 0x0000, 0x000000, &vesa_modes[2] },
0448     { 0x04, 0x3140, 0x000000, &vesa_modes[3] },
0449     { 0x05, 0x314c, 0x000000, &vesa_modes[4] },
0450     { 0x06, 0x314f, 0x000000, &vesa_modes[5] },
0451     { 0x07, 0x3159, 0x000000, &vesa_modes[6] },
0452     { 0x08, 0x0000, 0x000000, &vesa_modes[7] },
0453     { 0x09, 0x4540, 0x000000, &vesa_modes[8] },
0454     { 0x0a, 0x454c, 0x000000, &vesa_modes[9] },
0455     { 0x0b, 0x454f, 0x000000, &vesa_modes[10] },
0456     { 0x0c, 0x4559, 0x000000, &vesa_modes[11] },
0457     { 0x0d, 0x0000, 0x000000, NULL },
0458     { 0x0e, 0x0000, 0x000000, NULL },
0459     { 0x0f, 0x0000, 0x000000, &vesa_modes[12] },
0460     { 0x10, 0x6140, 0x000000, &vesa_modes[13] },
0461     { 0x11, 0x614a, 0x000000, &vesa_modes[14] },
0462     { 0x12, 0x614f, 0x000000, &vesa_modes[15] },
0463     { 0x13, 0x6159, 0x000000, &vesa_modes[16] },
0464     { 0x14, 0x0000, 0x000000, NULL },
0465     { 0x15, 0x714f, 0x000000, &vesa_modes[17] },
0466     { 0x16, 0x0000, 0x7f1c21, NULL },
0467     { 0x17, 0x0000, 0x7f1c28, NULL },
0468     { 0x18, 0x0000, 0x7f1c44, NULL },
0469     { 0x19, 0x0000, 0x7f1c62, NULL },
0470     { 0x1a, 0x0000, 0x000000, NULL },
0471     { 0x1b, 0x0000, 0x8f1821, NULL },
0472     { 0x1c, 0x8100, 0x8f1828, NULL },
0473     { 0x1d, 0x810f, 0x8f1844, NULL },
0474     { 0x1e, 0x8119, 0x8f1862, NULL },
0475     { 0x1f, 0x0000, 0x000000, NULL },
0476     { 0x20, 0x8140, 0x000000, &vesa_modes[18] },
0477     { 0x21, 0x8159, 0x000000, &vesa_modes[19] },
0478     { 0x22, 0x0000, 0x000000, NULL },
0479     { 0x23, 0x8180, 0x000000, &vesa_modes[20] },
0480     { 0x24, 0x818f, 0x000000, &vesa_modes[21] },
0481     { 0x25, 0x8199, 0x000000, &vesa_modes[22] },
0482     { 0x26, 0x0000, 0x000000, NULL },
0483     { 0x27, 0x0000, 0x000000, NULL },
0484     { 0x28, 0x0000, 0x000000, NULL },
0485     { 0x29, 0x0000, 0x0c2021, NULL },
0486     { 0x2a, 0x9040, 0x0c2028, NULL },
0487     { 0x2b, 0x904f, 0x0c2044, NULL },
0488     { 0x2c, 0x9059, 0x0c2062, NULL },
0489     { 0x2d, 0x0000, 0x000000, NULL },
0490     { 0x2e, 0x9500, 0xc11821, NULL },
0491     { 0x2f, 0x9500, 0xc11828, NULL },
0492     { 0x30, 0x950f, 0xc11844, NULL },
0493     { 0x31, 0x9519, 0xc11868, NULL },
0494     { 0x32, 0x0000, 0x000000, NULL },
0495     { 0x33, 0xa940, 0x000000, &vesa_modes[23] },
0496     { 0x34, 0xa945, 0x000000, &vesa_modes[24] },
0497     { 0x35, 0xa94a, 0x000000, &vesa_modes[25] },
0498     { 0x36, 0xa94f, 0x000000, &vesa_modes[26] },
0499     { 0x37, 0xa959, 0x000000, &vesa_modes[27] },
0500     { 0x38, 0x0000, 0x000000, NULL },
0501     { 0x39, 0x0000, 0x0c2821, NULL },
0502     { 0x3a, 0xb300, 0x0c2828, NULL },
0503     { 0x3b, 0xb30f, 0x0c2844, NULL },
0504     { 0x3c, 0xb319, 0x0c2868, NULL },
0505     { 0x3d, 0x0000, 0x000000, NULL },
0506     { 0x3e, 0xc140, 0x000000, &vesa_modes[28] },
0507     { 0x3f, 0xc14f, 0x000000, &vesa_modes[29] },
0508     { 0x40, 0x0000, 0x000000, NULL},
0509     { 0x41, 0xc940, 0x000000, &vesa_modes[30] },
0510     { 0x42, 0xc94f, 0x000000, &vesa_modes[31] },
0511     { 0x43, 0x0000, 0x000000, NULL },
0512     { 0x44, 0x0000, 0x572821, &vesa_modes[34] },
0513     { 0x45, 0xd100, 0x572828, &vesa_modes[35] },
0514     { 0x46, 0xd10f, 0x572844, &vesa_modes[36] },
0515     { 0x47, 0xd119, 0x572862, &vesa_modes[37] },
0516     { 0x48, 0x0000, 0x000000, NULL },
0517     { 0x49, 0xd140, 0x000000, &vesa_modes[32] },
0518     { 0x4a, 0xd14f, 0x000000, &vesa_modes[33] },
0519     { 0x4b, 0x0000, 0x000000, NULL },
0520     { 0x4c, 0x0000, 0x1f3821, &vesa_modes[38] },
0521     { 0x4d, 0x0000, 0x1f3828, &vesa_modes[39] },
0522     { 0x4e, 0x0000, 0x1f3844, &vesa_modes[40] },
0523     { 0x4f, 0x0000, 0x1f3862, &vesa_modes[41] },
0524     { 0x50, 0x0000, 0x000000, &vesa_modes[42] },
0525 };
0526 EXPORT_SYMBOL(dmt_modes);
0527 #endif /* CONFIG_FB_MODE_HELPERS */
0528 
0529 /**
0530  *  fb_try_mode - test a video mode
0531  *  @var: frame buffer user defined part of display
0532  *  @info: frame buffer info structure
0533  *  @mode: frame buffer video mode structure
0534  *  @bpp: color depth in bits per pixel
0535  *
0536  *  Tries a video mode to test it's validity for device @info.
0537  *
0538  *  Returns 1 on success.
0539  *
0540  */
0541 
0542 static int fb_try_mode(struct fb_var_screeninfo *var, struct fb_info *info,
0543                const struct fb_videomode *mode, unsigned int bpp)
0544 {
0545     int err = 0;
0546 
0547     DPRINTK("Trying mode %s %dx%d-%d@%d\n",
0548         mode->name ? mode->name : "noname",
0549         mode->xres, mode->yres, bpp, mode->refresh);
0550     var->xres = mode->xres;
0551     var->yres = mode->yres;
0552     var->xres_virtual = mode->xres;
0553     var->yres_virtual = mode->yres;
0554     var->xoffset = 0;
0555     var->yoffset = 0;
0556     var->bits_per_pixel = bpp;
0557     var->activate |= FB_ACTIVATE_TEST;
0558     var->pixclock = mode->pixclock;
0559     var->left_margin = mode->left_margin;
0560     var->right_margin = mode->right_margin;
0561     var->upper_margin = mode->upper_margin;
0562     var->lower_margin = mode->lower_margin;
0563     var->hsync_len = mode->hsync_len;
0564     var->vsync_len = mode->vsync_len;
0565     var->sync = mode->sync;
0566     var->vmode = mode->vmode;
0567     if (info->fbops->fb_check_var)
0568         err = info->fbops->fb_check_var(var, info);
0569     var->activate &= ~FB_ACTIVATE_TEST;
0570     return err;
0571 }
0572 
0573 /**
0574  * fb_find_mode - finds a valid video mode
0575  * @var: frame buffer user defined part of display
0576  * @info: frame buffer info structure
0577  * @mode_option: string video mode to find
0578  * @db: video mode database
0579  * @dbsize: size of @db
0580  * @default_mode: default video mode to fall back to
0581  * @default_bpp: default color depth in bits per pixel
0582  *
0583  * Finds a suitable video mode, starting with the specified mode
0584  * in @mode_option with fallback to @default_mode.  If
0585  * @default_mode fails, all modes in the video mode database will
0586  * be tried.
0587  *
0588  * Valid mode specifiers for @mode_option::
0589  *
0590  *     <xres>x<yres>[M][R][-<bpp>][@<refresh>][i][p][m]
0591  *
0592  * or ::
0593  *
0594  *     <name>[-<bpp>][@<refresh>]
0595  *
0596  * with <xres>, <yres>, <bpp> and <refresh> decimal numbers and
0597  * <name> a string.
0598  *
0599  * If 'M' is present after yres (and before refresh/bpp if present),
0600  * the function will compute the timings using VESA(tm) Coordinated
0601  * Video Timings (CVT).  If 'R' is present after 'M', will compute with
0602  * reduced blanking (for flatpanels).  If 'i' or 'p' are present, compute
0603  * interlaced or progressive mode.  If 'm' is present, add margins equal
0604  * to 1.8% of xres rounded down to 8 pixels, and 1.8% of yres. The char
0605  * 'i', 'p' and 'm' must be after 'M' and 'R'. Example::
0606  *
0607  *     1024x768MR-8@60m - Reduced blank with margins at 60Hz.
0608  *
0609  * NOTE: The passed struct @var is _not_ cleared!  This allows you
0610  * to supply values for e.g. the grayscale and accel_flags fields.
0611  *
0612  * Returns zero for failure, 1 if using specified @mode_option,
0613  * 2 if using specified @mode_option with an ignored refresh rate,
0614  * 3 if default mode is used, 4 if fall back to any valid mode.
0615  */
0616 
0617 int fb_find_mode(struct fb_var_screeninfo *var,
0618          struct fb_info *info, const char *mode_option,
0619          const struct fb_videomode *db, unsigned int dbsize,
0620          const struct fb_videomode *default_mode,
0621          unsigned int default_bpp)
0622 {
0623     int i;
0624 
0625     /* Set up defaults */
0626     if (!db) {
0627         db = modedb;
0628         dbsize = ARRAY_SIZE(modedb);
0629     }
0630 
0631     if (!default_mode)
0632         default_mode = &db[0];
0633 
0634     if (!default_bpp)
0635         default_bpp = 8;
0636 
0637     /* Did the user specify a video mode? */
0638     if (!mode_option)
0639         mode_option = fb_mode_option;
0640     if (mode_option) {
0641         const char *name = mode_option;
0642         unsigned int namelen = strlen(name);
0643         int res_specified = 0, bpp_specified = 0, refresh_specified = 0;
0644         unsigned int xres = 0, yres = 0, bpp = default_bpp, refresh = 0;
0645         int yres_specified = 0, cvt = 0, rb = 0;
0646         int interlace_specified = 0, interlace = 0;
0647         int margins = 0;
0648         u32 best, diff, tdiff;
0649 
0650         for (i = namelen-1; i >= 0; i--) {
0651             switch (name[i]) {
0652             case '@':
0653                 namelen = i;
0654                 if (!refresh_specified && !bpp_specified &&
0655                     !yres_specified) {
0656                     refresh = simple_strtol(&name[i+1], NULL,
0657                                 10);
0658                     refresh_specified = 1;
0659                     if (cvt || rb)
0660                         cvt = 0;
0661                 } else
0662                     goto done;
0663                 break;
0664             case '-':
0665                 namelen = i;
0666                 if (!bpp_specified && !yres_specified) {
0667                     bpp = simple_strtol(&name[i+1], NULL,
0668                                 10);
0669                     bpp_specified = 1;
0670                     if (cvt || rb)
0671                         cvt = 0;
0672                 } else
0673                     goto done;
0674                 break;
0675             case 'x':
0676                 if (!yres_specified) {
0677                     yres = simple_strtol(&name[i+1], NULL,
0678                                  10);
0679                     yres_specified = 1;
0680                 } else
0681                     goto done;
0682                 break;
0683             case '0' ... '9':
0684                 break;
0685             case 'M':
0686                 if (!yres_specified)
0687                     cvt = 1;
0688                 break;
0689             case 'R':
0690                 if (!cvt)
0691                     rb = 1;
0692                 break;
0693             case 'm':
0694                 if (!cvt)
0695                     margins = 1;
0696                 break;
0697             case 'p':
0698                 if (!cvt) {
0699                     interlace = 0;
0700                     interlace_specified = 1;
0701                 }
0702                 break;
0703             case 'i':
0704                 if (!cvt) {
0705                     interlace = 1;
0706                     interlace_specified = 1;
0707                 }
0708                 break;
0709             default:
0710                 goto done;
0711             }
0712         }
0713         if (i < 0 && yres_specified) {
0714             xres = simple_strtol(name, NULL, 10);
0715             res_specified = 1;
0716         }
0717 done:
0718         if (cvt) {
0719             struct fb_videomode cvt_mode;
0720             int ret;
0721 
0722             DPRINTK("CVT mode %dx%d@%dHz%s%s%s\n", xres, yres,
0723                 (refresh) ? refresh : 60,
0724                 (rb) ? " reduced blanking" : "",
0725                 (margins) ? " with margins" : "",
0726                 (interlace) ? " interlaced" : "");
0727 
0728             memset(&cvt_mode, 0, sizeof(cvt_mode));
0729             cvt_mode.xres = xres;
0730             cvt_mode.yres = yres;
0731             cvt_mode.refresh = (refresh) ? refresh : 60;
0732 
0733             if (interlace)
0734                 cvt_mode.vmode |= FB_VMODE_INTERLACED;
0735             else
0736                 cvt_mode.vmode &= ~FB_VMODE_INTERLACED;
0737 
0738             ret = fb_find_mode_cvt(&cvt_mode, margins, rb);
0739 
0740             if (!ret && !fb_try_mode(var, info, &cvt_mode, bpp)) {
0741                 DPRINTK("modedb CVT: CVT mode ok\n");
0742                 return 1;
0743             }
0744 
0745             DPRINTK("CVT mode invalid, getting mode from database\n");
0746         }
0747 
0748         DPRINTK("Trying specified video mode%s %ix%i\n",
0749             refresh_specified ? "" : " (ignoring refresh rate)",
0750             xres, yres);
0751 
0752         if (!refresh_specified) {
0753             /*
0754              * If the caller has provided a custom mode database and
0755              * a valid monspecs structure, we look for the mode with
0756              * the highest refresh rate.  Otherwise we play it safe
0757              * it and try to find a mode with a refresh rate closest
0758              * to the standard 60 Hz.
0759              */
0760             if (db != modedb &&
0761                 info->monspecs.vfmin && info->monspecs.vfmax &&
0762                 info->monspecs.hfmin && info->monspecs.hfmax &&
0763                 info->monspecs.dclkmax) {
0764                 refresh = 1000;
0765             } else {
0766                 refresh = 60;
0767             }
0768         }
0769 
0770         diff = -1;
0771         best = -1;
0772         for (i = 0; i < dbsize; i++) {
0773             if ((name_matches(db[i], name, namelen) ||
0774                  (res_specified && res_matches(db[i], xres, yres))) &&
0775                 !fb_try_mode(var, info, &db[i], bpp)) {
0776                 const int db_interlace = (db[i].vmode &
0777                     FB_VMODE_INTERLACED ? 1 : 0);
0778                 int score = abs(db[i].refresh - refresh);
0779 
0780                 if (interlace_specified)
0781                     score += abs(db_interlace - interlace);
0782 
0783                 if (!interlace_specified ||
0784                     db_interlace == interlace)
0785                     if (refresh_specified &&
0786                         db[i].refresh == refresh)
0787                         return 1;
0788 
0789                 if (score < diff) {
0790                     diff = score;
0791                     best = i;
0792                 }
0793             }
0794         }
0795         if (best != -1) {
0796             fb_try_mode(var, info, &db[best], bpp);
0797             return (refresh_specified) ? 2 : 1;
0798         }
0799 
0800         diff = 2 * (xres + yres);
0801         best = -1;
0802         DPRINTK("Trying best-fit modes\n");
0803         for (i = 0; i < dbsize; i++) {
0804             DPRINTK("Trying %ix%i\n", db[i].xres, db[i].yres);
0805             if (!fb_try_mode(var, info, &db[i], bpp)) {
0806                 tdiff = abs(db[i].xres - xres) +
0807                     abs(db[i].yres - yres);
0808 
0809                 /*
0810                  * Penalize modes with resolutions smaller
0811                  * than requested.
0812                  */
0813                 if (xres > db[i].xres || yres > db[i].yres)
0814                     tdiff += xres + yres;
0815 
0816                 if (diff > tdiff) {
0817                     diff = tdiff;
0818                     best = i;
0819                 }
0820             }
0821         }
0822         if (best != -1) {
0823             fb_try_mode(var, info, &db[best], bpp);
0824             return 5;
0825         }
0826     }
0827 
0828     DPRINTK("Trying default video mode\n");
0829     if (!fb_try_mode(var, info, default_mode, default_bpp))
0830         return 3;
0831 
0832     DPRINTK("Trying all modes\n");
0833     for (i = 0; i < dbsize; i++)
0834         if (!fb_try_mode(var, info, &db[i], default_bpp))
0835             return 4;
0836 
0837     DPRINTK("No valid mode found\n");
0838     return 0;
0839 }
0840 
0841 /**
0842  * fb_var_to_videomode - convert fb_var_screeninfo to fb_videomode
0843  * @mode: pointer to struct fb_videomode
0844  * @var: pointer to struct fb_var_screeninfo
0845  */
0846 void fb_var_to_videomode(struct fb_videomode *mode,
0847              const struct fb_var_screeninfo *var)
0848 {
0849     u32 pixclock, hfreq, htotal, vtotal;
0850 
0851     mode->name = NULL;
0852     mode->xres = var->xres;
0853     mode->yres = var->yres;
0854     mode->pixclock = var->pixclock;
0855     mode->hsync_len = var->hsync_len;
0856     mode->vsync_len = var->vsync_len;
0857     mode->left_margin = var->left_margin;
0858     mode->right_margin = var->right_margin;
0859     mode->upper_margin = var->upper_margin;
0860     mode->lower_margin = var->lower_margin;
0861     mode->sync = var->sync;
0862     mode->vmode = var->vmode & FB_VMODE_MASK;
0863     mode->flag = FB_MODE_IS_FROM_VAR;
0864     mode->refresh = 0;
0865 
0866     if (!var->pixclock)
0867         return;
0868 
0869     pixclock = PICOS2KHZ(var->pixclock) * 1000;
0870 
0871     htotal = var->xres + var->right_margin + var->hsync_len +
0872         var->left_margin;
0873     vtotal = var->yres + var->lower_margin + var->vsync_len +
0874         var->upper_margin;
0875 
0876     if (var->vmode & FB_VMODE_INTERLACED)
0877         vtotal /= 2;
0878     if (var->vmode & FB_VMODE_DOUBLE)
0879         vtotal *= 2;
0880 
0881     if (!htotal || !vtotal)
0882         return;
0883 
0884     hfreq = pixclock/htotal;
0885     mode->refresh = hfreq/vtotal;
0886 }
0887 
0888 /**
0889  * fb_videomode_to_var - convert fb_videomode to fb_var_screeninfo
0890  * @var: pointer to struct fb_var_screeninfo
0891  * @mode: pointer to struct fb_videomode
0892  */
0893 void fb_videomode_to_var(struct fb_var_screeninfo *var,
0894              const struct fb_videomode *mode)
0895 {
0896     var->xres = mode->xres;
0897     var->yres = mode->yres;
0898     var->xres_virtual = mode->xres;
0899     var->yres_virtual = mode->yres;
0900     var->xoffset = 0;
0901     var->yoffset = 0;
0902     var->pixclock = mode->pixclock;
0903     var->left_margin = mode->left_margin;
0904     var->right_margin = mode->right_margin;
0905     var->upper_margin = mode->upper_margin;
0906     var->lower_margin = mode->lower_margin;
0907     var->hsync_len = mode->hsync_len;
0908     var->vsync_len = mode->vsync_len;
0909     var->sync = mode->sync;
0910     var->vmode = mode->vmode & FB_VMODE_MASK;
0911 }
0912 
0913 /**
0914  * fb_mode_is_equal - compare 2 videomodes
0915  * @mode1: first videomode
0916  * @mode2: second videomode
0917  *
0918  * RETURNS:
0919  * 1 if equal, 0 if not
0920  */
0921 int fb_mode_is_equal(const struct fb_videomode *mode1,
0922              const struct fb_videomode *mode2)
0923 {
0924     return (mode1->xres         == mode2->xres &&
0925         mode1->yres         == mode2->yres &&
0926         mode1->pixclock     == mode2->pixclock &&
0927         mode1->hsync_len    == mode2->hsync_len &&
0928         mode1->vsync_len    == mode2->vsync_len &&
0929         mode1->left_margin  == mode2->left_margin &&
0930         mode1->right_margin == mode2->right_margin &&
0931         mode1->upper_margin == mode2->upper_margin &&
0932         mode1->lower_margin == mode2->lower_margin &&
0933         mode1->sync         == mode2->sync &&
0934         mode1->vmode        == mode2->vmode);
0935 }
0936 
0937 /**
0938  * fb_find_best_mode - find best matching videomode
0939  * @var: pointer to struct fb_var_screeninfo
0940  * @head: pointer to struct list_head of modelist
0941  *
0942  * RETURNS:
0943  * struct fb_videomode, NULL if none found
0944  *
0945  * IMPORTANT:
0946  * This function assumes that all modelist entries in
0947  * info->modelist are valid.
0948  *
0949  * NOTES:
0950  * Finds best matching videomode which has an equal or greater dimension than
0951  * var->xres and var->yres.  If more than 1 videomode is found, will return
0952  * the videomode with the highest refresh rate
0953  */
0954 const struct fb_videomode *fb_find_best_mode(const struct fb_var_screeninfo *var,
0955                          struct list_head *head)
0956 {
0957     struct list_head *pos;
0958     struct fb_modelist *modelist;
0959     struct fb_videomode *mode, *best = NULL;
0960     u32 diff = -1;
0961 
0962     list_for_each(pos, head) {
0963         u32 d;
0964 
0965         modelist = list_entry(pos, struct fb_modelist, list);
0966         mode = &modelist->mode;
0967 
0968         if (mode->xres >= var->xres && mode->yres >= var->yres) {
0969             d = (mode->xres - var->xres) +
0970                 (mode->yres - var->yres);
0971             if (diff > d) {
0972                 diff = d;
0973                 best = mode;
0974             } else if (diff == d && best &&
0975                    mode->refresh > best->refresh)
0976                 best = mode;
0977         }
0978     }
0979     return best;
0980 }
0981 
0982 /**
0983  * fb_find_nearest_mode - find closest videomode
0984  *
0985  * @mode: pointer to struct fb_videomode
0986  * @head: pointer to modelist
0987  *
0988  * Finds best matching videomode, smaller or greater in dimension.
0989  * If more than 1 videomode is found, will return the videomode with
0990  * the closest refresh rate.
0991  */
0992 const struct fb_videomode *fb_find_nearest_mode(const struct fb_videomode *mode,
0993                             struct list_head *head)
0994 {
0995     struct list_head *pos;
0996     struct fb_modelist *modelist;
0997     struct fb_videomode *cmode, *best = NULL;
0998     u32 diff = -1, diff_refresh = -1;
0999 
1000     list_for_each(pos, head) {
1001         u32 d;
1002 
1003         modelist = list_entry(pos, struct fb_modelist, list);
1004         cmode = &modelist->mode;
1005 
1006         d = abs(cmode->xres - mode->xres) +
1007             abs(cmode->yres - mode->yres);
1008         if (diff > d) {
1009             diff = d;
1010             diff_refresh = abs(cmode->refresh - mode->refresh);
1011             best = cmode;
1012         } else if (diff == d) {
1013             d = abs(cmode->refresh - mode->refresh);
1014             if (diff_refresh > d) {
1015                 diff_refresh = d;
1016                 best = cmode;
1017             }
1018         }
1019     }
1020 
1021     return best;
1022 }
1023 
1024 /**
1025  * fb_match_mode - find a videomode which exactly matches the timings in var
1026  * @var: pointer to struct fb_var_screeninfo
1027  * @head: pointer to struct list_head of modelist
1028  *
1029  * RETURNS:
1030  * struct fb_videomode, NULL if none found
1031  */
1032 const struct fb_videomode *fb_match_mode(const struct fb_var_screeninfo *var,
1033                      struct list_head *head)
1034 {
1035     struct list_head *pos;
1036     struct fb_modelist *modelist;
1037     struct fb_videomode *m, mode;
1038 
1039     fb_var_to_videomode(&mode, var);
1040     list_for_each(pos, head) {
1041         modelist = list_entry(pos, struct fb_modelist, list);
1042         m = &modelist->mode;
1043         if (fb_mode_is_equal(m, &mode))
1044             return m;
1045     }
1046     return NULL;
1047 }
1048 
1049 /**
1050  * fb_add_videomode - adds videomode entry to modelist
1051  * @mode: videomode to add
1052  * @head: struct list_head of modelist
1053  *
1054  * NOTES:
1055  * Will only add unmatched mode entries
1056  */
1057 int fb_add_videomode(const struct fb_videomode *mode, struct list_head *head)
1058 {
1059     struct list_head *pos;
1060     struct fb_modelist *modelist;
1061     struct fb_videomode *m;
1062     int found = 0;
1063 
1064     list_for_each(pos, head) {
1065         modelist = list_entry(pos, struct fb_modelist, list);
1066         m = &modelist->mode;
1067         if (fb_mode_is_equal(m, mode)) {
1068             found = 1;
1069             break;
1070         }
1071     }
1072     if (!found) {
1073         modelist = kmalloc(sizeof(struct fb_modelist),
1074                           GFP_KERNEL);
1075 
1076         if (!modelist)
1077             return -ENOMEM;
1078         modelist->mode = *mode;
1079         list_add(&modelist->list, head);
1080     }
1081     return 0;
1082 }
1083 
1084 /**
1085  * fb_delete_videomode - removed videomode entry from modelist
1086  * @mode: videomode to remove
1087  * @head: struct list_head of modelist
1088  *
1089  * NOTES:
1090  * Will remove all matching mode entries
1091  */
1092 void fb_delete_videomode(const struct fb_videomode *mode,
1093              struct list_head *head)
1094 {
1095     struct list_head *pos, *n;
1096     struct fb_modelist *modelist;
1097     struct fb_videomode *m;
1098 
1099     list_for_each_safe(pos, n, head) {
1100         modelist = list_entry(pos, struct fb_modelist, list);
1101         m = &modelist->mode;
1102         if (fb_mode_is_equal(m, mode)) {
1103             list_del(pos);
1104             kfree(pos);
1105         }
1106     }
1107 }
1108 
1109 /**
1110  * fb_destroy_modelist - destroy modelist
1111  * @head: struct list_head of modelist
1112  */
1113 void fb_destroy_modelist(struct list_head *head)
1114 {
1115     struct list_head *pos, *n;
1116 
1117     list_for_each_safe(pos, n, head) {
1118         list_del(pos);
1119         kfree(pos);
1120     }
1121 }
1122 EXPORT_SYMBOL_GPL(fb_destroy_modelist);
1123 
1124 /**
1125  * fb_videomode_to_modelist - convert mode array to mode list
1126  * @modedb: array of struct fb_videomode
1127  * @num: number of entries in array
1128  * @head: struct list_head of modelist
1129  */
1130 void fb_videomode_to_modelist(const struct fb_videomode *modedb, int num,
1131                   struct list_head *head)
1132 {
1133     int i;
1134 
1135     INIT_LIST_HEAD(head);
1136 
1137     for (i = 0; i < num; i++) {
1138         if (fb_add_videomode(&modedb[i], head))
1139             return;
1140     }
1141 }
1142 
1143 const struct fb_videomode *fb_find_best_display(const struct fb_monspecs *specs,
1144                             struct list_head *head)
1145 {
1146     struct list_head *pos;
1147     struct fb_modelist *modelist;
1148     const struct fb_videomode *m, *m1 = NULL, *md = NULL, *best = NULL;
1149     int first = 0;
1150 
1151     if (!head->prev || !head->next || list_empty(head))
1152         goto finished;
1153 
1154     /* get the first detailed mode and the very first mode */
1155     list_for_each(pos, head) {
1156         modelist = list_entry(pos, struct fb_modelist, list);
1157         m = &modelist->mode;
1158 
1159         if (!first) {
1160             m1 = m;
1161             first = 1;
1162         }
1163 
1164         if (m->flag & FB_MODE_IS_FIRST) {
1165             md = m;
1166             break;
1167         }
1168     }
1169 
1170     /* first detailed timing is preferred */
1171     if (specs->misc & FB_MISC_1ST_DETAIL) {
1172         best = md;
1173         goto finished;
1174     }
1175 
1176     /* find best mode based on display width and height */
1177     if (specs->max_x && specs->max_y) {
1178         struct fb_var_screeninfo var;
1179 
1180         memset(&var, 0, sizeof(struct fb_var_screeninfo));
1181         var.xres = (specs->max_x * 7200)/254;
1182         var.yres = (specs->max_y * 7200)/254;
1183         m = fb_find_best_mode(&var, head);
1184         if (m) {
1185             best = m;
1186             goto finished;
1187         }
1188     }
1189 
1190     /* use first detailed mode */
1191     if (md) {
1192         best = md;
1193         goto finished;
1194     }
1195 
1196     /* last resort, use the very first mode */
1197     best = m1;
1198 finished:
1199     return best;
1200 }
1201 EXPORT_SYMBOL(fb_find_best_display);
1202 
1203 EXPORT_SYMBOL(fb_videomode_to_var);
1204 EXPORT_SYMBOL(fb_var_to_videomode);
1205 EXPORT_SYMBOL(fb_mode_is_equal);
1206 EXPORT_SYMBOL(fb_add_videomode);
1207 EXPORT_SYMBOL(fb_match_mode);
1208 EXPORT_SYMBOL(fb_find_best_mode);
1209 EXPORT_SYMBOL(fb_find_nearest_mode);
1210 EXPORT_SYMBOL(fb_videomode_to_modelist);
1211 EXPORT_SYMBOL(fb_find_mode);
1212 EXPORT_SYMBOL(fb_find_mode_cvt);
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