LXR linux/drivers/video/modedb.c

   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
  30const char *fb_mode_option;
  31EXPORT_SYMBOL_GPL(fb_mode_option);
  32
  33    /*
  34     *  Standard video mode definitions (taken from XFree86)
  35     */
  36
  37static 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       /* 720x576i @ 50 Hz, 15.625 kHz hsync (PAL RGB) */
 269       NULL, 50, 720, 576, 74074, 64, 16, 39, 5, 64, 5,
 270       0, FB_VMODE_INTERLACED
 271    }, {
 272       /* 800x520i @ 50 Hz, 15.625 kHz hsync (PAL RGB) */
 273       NULL, 50, 800, 520, 58823, 144, 64, 72, 28, 80, 5,
 274       0, FB_VMODE_INTERLACED
 275    },
 276};
 277
 278#ifdef CONFIG_FB_MODE_HELPERS
 279const struct fb_videomode vesa_modes[] = {
 280        /* 0 640x350-85 VESA */
 281        { NULL, 85, 640, 350, 31746,  96, 32, 60, 32, 64, 3,
 282          FB_SYNC_HOR_HIGH_ACT, FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA},
 283        /* 1 640x400-85 VESA */
 284        { NULL, 85, 640, 400, 31746,  96, 32, 41, 01, 64, 3,
 285          FB_SYNC_VERT_HIGH_ACT, FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
 286        /* 2 720x400-85 VESA */
 287        { NULL, 85, 721, 400, 28169, 108, 36, 42, 01, 72, 3,
 288          FB_SYNC_VERT_HIGH_ACT, FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
 289        /* 3 640x480-60 VESA */
 290        { NULL, 60, 640, 480, 39682,  48, 16, 33, 10, 96, 2, 
 291          0, FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
 292        /* 4 640x480-72 VESA */
 293        { NULL, 72, 640, 480, 31746, 128, 24, 29, 9, 40, 2, 
 294          0, FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
 295        /* 5 640x480-75 VESA */
 296        { NULL, 75, 640, 480, 31746, 120, 16, 16, 01, 64, 3,
 297          0, FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
 298        /* 6 640x480-85 VESA */
 299        { NULL, 85, 640, 480, 27777, 80, 56, 25, 01, 56, 3,
 300          0, FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
 301        /* 7 800x600-56 VESA */
 302        { NULL, 56, 800, 600, 27777, 128, 24, 22, 01, 72, 2,
 303          FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
 304          FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
 305        /* 8 800x600-60 VESA */
 306        { NULL, 60, 800, 600, 25000, 88, 40, 23, 01, 128, 4,
 307          FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
 308          FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
 309        /* 9 800x600-72 VESA */
 310        { NULL, 72, 800, 600, 20000, 64, 56, 23, 37, 120, 6,
 311          FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
 312          FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
 313        /* 10 800x600-75 VESA */
 314        { NULL, 75, 800, 600, 20202, 160, 16, 21, 01, 80, 3,
 315          FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
 316          FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
 317        /* 11 800x600-85 VESA */
 318        { NULL, 85, 800, 600, 17761, 152, 32, 27, 01, 64, 3,
 319          FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
 320          FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
 321        /* 12 1024x768i-43 VESA */
 322        { NULL, 43, 1024, 768, 22271, 56, 8, 41, 0, 176, 8,
 323          FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
 324          FB_VMODE_INTERLACED, FB_MODE_IS_VESA },
 325        /* 13 1024x768-60 VESA */
 326        { NULL, 60, 1024, 768, 15384, 160, 24, 29, 3, 136, 6,
 327          0, FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
 328        /* 14 1024x768-70 VESA */
 329        { NULL, 70, 1024, 768, 13333, 144, 24, 29, 3, 136, 6,
 330          0, FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
 331        /* 15 1024x768-75 VESA */
 332        { NULL, 75, 1024, 768, 12690, 176, 16, 28, 1, 96, 3,
 333          FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
 334          FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
 335        /* 16 1024x768-85 VESA */
 336        { NULL, 85, 1024, 768, 10582, 208, 48, 36, 1, 96, 3,
 337          FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
 338          FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
 339        /* 17 1152x864-75 VESA */
 340        { NULL, 75, 1152, 864, 9259, 256, 64, 32, 1, 128, 3,
 341          FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
 342          FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
 343        /* 18 1280x960-60 VESA */
 344        { NULL, 60, 1280, 960, 9259, 312, 96, 36, 1, 112, 3,
 345          FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
 346          FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
 347        /* 19 1280x960-85 VESA */
 348        { NULL, 85, 1280, 960, 6734, 224, 64, 47, 1, 160, 3,
 349          FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
 350          FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
 351        /* 20 1280x1024-60 VESA */
 352        { NULL, 60, 1280, 1024, 9259, 248, 48, 38, 1, 112, 3,
 353          FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
 354          FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
 355        /* 21 1280x1024-75 VESA */
 356        { NULL, 75, 1280, 1024, 7407, 248, 16, 38, 1, 144, 3,
 357          FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
 358          FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
 359        /* 22 1280x1024-85 VESA */
 360        { NULL, 85, 1280, 1024, 6349, 224, 64, 44, 1, 160, 3,
 361          FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
 362          FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
 363        /* 23 1600x1200-60 VESA */
 364        { NULL, 60, 1600, 1200, 6172, 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        /* 24 1600x1200-65 VESA */
 368        { NULL, 65, 1600, 1200, 5698, 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        /* 25 1600x1200-70 VESA */
 372        { NULL, 70, 1600, 1200, 5291, 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        /* 26 1600x1200-75 VESA */
 376        { NULL, 75, 1600, 1200, 4938, 304, 64, 46, 1, 192, 3, 
 377          FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
 378          FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
 379        /* 27 1600x1200-85 VESA */
 380        { NULL, 85, 1600, 1200, 4357, 304, 64, 46, 1, 192, 3,
 381          FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
 382          FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
 383        /* 28 1792x1344-60 VESA */
 384        { NULL, 60, 1792, 1344, 4882, 328, 128, 46, 1, 200, 3,
 385          FB_SYNC_VERT_HIGH_ACT, FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
 386        /* 29 1792x1344-75 VESA */
 387        { NULL, 75, 1792, 1344, 3831, 352, 96, 69, 1, 216, 3,
 388          FB_SYNC_VERT_HIGH_ACT, FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
 389        /* 30 1856x1392-60 VESA */
 390        { NULL, 60, 1856, 1392, 4580, 352, 96, 43, 1, 224, 3,
 391          FB_SYNC_VERT_HIGH_ACT, FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
 392        /* 31 1856x1392-75 VESA */
 393        { NULL, 75, 1856, 1392, 3472, 352, 128, 104, 1, 224, 3,
 394          FB_SYNC_VERT_HIGH_ACT, FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
 395        /* 32 1920x1440-60 VESA */
 396        { NULL, 60, 1920, 1440, 4273, 344, 128, 56, 1, 200, 3,
 397          FB_SYNC_VERT_HIGH_ACT, FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
 398        /* 33 1920x1440-75 VESA */
 399        { NULL, 75, 1920, 1440, 3367, 352, 144, 56, 1, 224, 3,
 400          FB_SYNC_VERT_HIGH_ACT, FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
 401};
 402EXPORT_SYMBOL(vesa_modes);
 403#endif /* CONFIG_FB_MODE_HELPERS */
 404
 405static int my_atoi(const char *name)
 406{
 407    int val = 0;
 408
 409    for (;; name++) {
 410        switch (*name) {
 411            case '0' ... '9':
 412                val = 10*val+(*name-'0');
 413                break;
 414            default:
 415                return val;
 416        }
 417    }
 418}
 419
 420/**
 421 *      fb_try_mode - test a video mode
 422 *      @var: frame buffer user defined part of display
 423 *      @info: frame buffer info structure
 424 *      @mode: frame buffer video mode structure
 425 *      @bpp: color depth in bits per pixel
 426 *
 427 *      Tries a video mode to test it's validity for device @info.
 428 *
 429 *      Returns 1 on success.
 430 *
 431 */
 432
 433static int fb_try_mode(struct fb_var_screeninfo *var, struct fb_info *info,
 434                       const struct fb_videomode *mode, unsigned int bpp)
 435{
 436    int err = 0;
 437
 438    DPRINTK("Trying mode %s %dx%d-%d@%d\n", mode->name ? mode->name : "noname",
 439            mode->xres, mode->yres, bpp, mode->refresh);
 440    var->xres = mode->xres;
 441    var->yres = mode->yres;
 442    var->xres_virtual = mode->xres;
 443    var->yres_virtual = mode->yres;
 444    var->xoffset = 0;
 445    var->yoffset = 0;
 446    var->bits_per_pixel = bpp;
 447    var->activate |= FB_ACTIVATE_TEST;
 448    var->pixclock = mode->pixclock;
 449    var->left_margin = mode->left_margin;
 450    var->right_margin = mode->right_margin;
 451    var->upper_margin = mode->upper_margin;
 452    var->lower_margin = mode->lower_margin;
 453    var->hsync_len = mode->hsync_len;
 454    var->vsync_len = mode->vsync_len;
 455    var->sync = mode->sync;
 456    var->vmode = mode->vmode;
 457    if (info->fbops->fb_check_var)
 458        err = info->fbops->fb_check_var(var, info);
 459    var->activate &= ~FB_ACTIVATE_TEST;
 460    return err;
 461}
 462
 463/**
 464 *      fb_find_mode - finds a valid video mode
 465 *      @var: frame buffer user defined part of display
 466 *      @info: frame buffer info structure
 467 *      @mode_option: string video mode to find
 468 *      @db: video mode database
 469 *      @dbsize: size of @db
 470 *      @default_mode: default video mode to fall back to
 471 *      @default_bpp: default color depth in bits per pixel
 472 *
 473 *      Finds a suitable video mode, starting with the specified mode
 474 *      in @mode_option with fallback to @default_mode.  If
 475 *      @default_mode fails, all modes in the video mode database will
 476 *      be tried.
 477 *
 478 *      Valid mode specifiers for @mode_option:
 479 *
 480 *      <xres>x<yres>[M][R][-<bpp>][@<refresh>][i][m] or
 481 *      <name>[-<bpp>][@<refresh>]
 482 *
 483 *      with <xres>, <yres>, <bpp> and <refresh> decimal numbers and
 484 *      <name> a string.
 485 *
 486 *      If 'M' is present after yres (and before refresh/bpp if present),
 487 *      the function will compute the timings using VESA(tm) Coordinated
 488 *      Video Timings (CVT).  If 'R' is present after 'M', will compute with
 489 *      reduced blanking (for flatpanels).  If 'i' is present, compute
 490 *      interlaced mode.  If 'm' is present, add margins equal to 1.8%
 491 *      of xres rounded down to 8 pixels, and 1.8% of yres. The char
 492 *      'i' and 'm' must be after 'M' and 'R'. Example:
 493 *
 494 *      1024x768MR-8@60m - Reduced blank with margins at 60Hz.
 495 *
 496 *      NOTE: The passed struct @var is _not_ cleared!  This allows you
 497 *      to supply values for e.g. the grayscale and accel_flags fields.
 498 *
 499 *      Returns zero for failure, 1 if using specified @mode_option,
 500 *      2 if using specified @mode_option with an ignored refresh rate,
 501 *      3 if default mode is used, 4 if fall back to any valid mode.
 502 *
 503 */
 504
 505int fb_find_mode(struct fb_var_screeninfo *var,
 506                 struct fb_info *info, const char *mode_option,
 507                 const struct fb_videomode *db, unsigned int dbsize,
 508                 const struct fb_videomode *default_mode,
 509                 unsigned int default_bpp)
 510{
 511    int i;
 512
 513    /* Set up defaults */
 514    if (!db) {
 515        db = modedb;
 516        dbsize = ARRAY_SIZE(modedb);
 517    }
 518
 519    if (!default_mode)
 520        default_mode = &db[0];
 521
 522    if (!default_bpp)
 523        default_bpp = 8;
 524
 525    /* Did the user specify a video mode? */
 526    if (!mode_option)
 527        mode_option = fb_mode_option;
 528    if (mode_option) {
 529        const char *name = mode_option;
 530        unsigned int namelen = strlen(name);
 531        int res_specified = 0, bpp_specified = 0, refresh_specified = 0;
 532        unsigned int xres = 0, yres = 0, bpp = default_bpp, refresh = 0;
 533        int yres_specified = 0, cvt = 0, rb = 0, interlace = 0, margins = 0;
 534        u32 best, diff, tdiff;
 535
 536        for (i = namelen-1; i >= 0; i--) {
 537            switch (name[i]) {
 538                case '@':
 539                    namelen = i;
 540                    if (!refresh_specified && !bpp_specified &&
 541                        !yres_specified) {
 542                        refresh = my_atoi(&name[i+1]);
 543                        refresh_specified = 1;
 544                        if (cvt || rb)
 545                            cvt = 0;
 546                    } else
 547                        goto done;
 548                    break;
 549                case '-':
 550                    namelen = i;
 551                    if (!bpp_specified && !yres_specified) {
 552                        bpp = my_atoi(&name[i+1]);
 553                        bpp_specified = 1;
 554                        if (cvt || rb)
 555                            cvt = 0;
 556                    } else
 557                        goto done;
 558                    break;
 559                case 'x':
 560                    if (!yres_specified) {
 561                        yres = my_atoi(&name[i+1]);
 562                        yres_specified = 1;
 563                    } else
 564                        goto done;
 565                    break;
 566                case '0' ... '9':
 567                    break;
 568                case 'M':
 569                    if (!yres_specified)
 570                        cvt = 1;
 571                    break;
 572                case 'R':
 573                    if (!cvt)
 574                        rb = 1;
 575                    break;
 576                case 'm':
 577                    if (!cvt)
 578                        margins = 1;
 579                    break;
 580                case 'i':
 581                    if (!cvt)
 582                        interlace = 1;
 583                    break;
 584                default:
 585                    goto done;
 586            }
 587        }
 588        if (i < 0 && yres_specified) {
 589            xres = my_atoi(name);
 590            res_specified = 1;
 591        }
 592done:
 593        if (cvt) {
 594            struct fb_videomode cvt_mode;
 595            int ret;
 596
 597            DPRINTK("CVT mode %dx%d@%dHz%s%s%s\n", xres, yres,
 598                    (refresh) ? refresh : 60, (rb) ? " reduced blanking" :
 599                    "", (margins) ? " with margins" : "", (interlace) ?
 600                    " interlaced" : "");
 601
 602            memset(&cvt_mode, 0, sizeof(cvt_mode));
 603            cvt_mode.xres = xres;
 604            cvt_mode.yres = yres;
 605            cvt_mode.refresh = (refresh) ? refresh : 60;
 606
 607            if (interlace)
 608                cvt_mode.vmode |= FB_VMODE_INTERLACED;
 609            else
 610                cvt_mode.vmode &= ~FB_VMODE_INTERLACED;
 611
 612            ret = fb_find_mode_cvt(&cvt_mode, margins, rb);
 613
 614            if (!ret && !fb_try_mode(var, info, &cvt_mode, bpp)) {
 615                DPRINTK("modedb CVT: CVT mode ok\n");
 616                return 1;
 617            }
 618
 619            DPRINTK("CVT mode invalid, getting mode from database\n");
 620        }
 621
 622        DPRINTK("Trying specified video mode%s %ix%i\n",
 623            refresh_specified ? "" : " (ignoring refresh rate)", xres, yres);
 624
 625        if (!refresh_specified) {
 626                /*
 627                 * If the caller has provided a custom mode database and a
 628                 * valid monspecs structure, we look for the mode with the
 629                 * highest refresh rate.  Otherwise we play it safe it and
 630                 * try to find a mode with a refresh rate closest to the
 631                 * standard 60 Hz.
 632                 */
 633                if (db != modedb &&
 634                    info->monspecs.vfmin && info->monspecs.vfmax &&
 635                    info->monspecs.hfmin && info->monspecs.hfmax &&
 636                    info->monspecs.dclkmax) {
 637                        refresh = 1000;
 638                } else {
 639                        refresh = 60;
 640                }
 641        }
 642
 643        diff = -1;
 644        best = -1;
 645        for (i = 0; i < dbsize; i++) {
 646                if ((name_matches(db[i], name, namelen) ||
 647                    (res_specified && res_matches(db[i], xres, yres))) &&
 648                    !fb_try_mode(var, info, &db[i], bpp)) {
 649                        if (refresh_specified && db[i].refresh == refresh) {
 650                                return 1;
 651                        } else {
 652                                if (abs(db[i].refresh - refresh) < diff) {
 653                                        diff = abs(db[i].refresh - refresh);
 654                                        best = i;
 655                                }
 656                        }
 657                }
 658        }
 659        if (best != -1) {
 660                fb_try_mode(var, info, &db[best], bpp);
 661                return (refresh_specified) ? 2 : 1;
 662        }
 663
 664        diff = 2 * (xres + yres);
 665        best = -1;
 666        DPRINTK("Trying best-fit modes\n");
 667        for (i = 0; i < dbsize; i++) {
 668                DPRINTK("Trying %ix%i\n", db[i].xres, db[i].yres);
 669                if (!fb_try_mode(var, info, &db[i], bpp)) {
 670                        tdiff = abs(db[i].xres - xres) +
 671                                abs(db[i].yres - yres);
 672
 673                        /*
 674                         * Penalize modes with resolutions smaller
 675                         * than requested.
 676                         */
 677                        if (xres > db[i].xres || yres > db[i].yres)
 678                                tdiff += xres + yres;
 679
 680                        if (diff > tdiff) {
 681                                diff = tdiff;
 682                                best = i;
 683                        }
 684                }
 685        }
 686        if (best != -1) {
 687            fb_try_mode(var, info, &db[best], bpp);
 688            return 5;
 689        }
 690    }
 691
 692    DPRINTK("Trying default video mode\n");
 693    if (!fb_try_mode(var, info, default_mode, default_bpp))
 694        return 3;
 695
 696    DPRINTK("Trying all modes\n");
 697    for (i = 0; i < dbsize; i++)
 698        if (!fb_try_mode(var, info, &db[i], default_bpp))
 699            return 4;
 700
 701    DPRINTK("No valid mode found\n");
 702    return 0;
 703}
 704
 705/**
 706 * fb_var_to_videomode - convert fb_var_screeninfo to fb_videomode
 707 * @mode: pointer to struct fb_videomode
 708 * @var: pointer to struct fb_var_screeninfo
 709 */
 710void fb_var_to_videomode(struct fb_videomode *mode,
 711                         const struct fb_var_screeninfo *var)
 712{
 713        u32 pixclock, hfreq, htotal, vtotal;
 714
 715        mode->name = NULL;
 716        mode->xres = var->xres;
 717        mode->yres = var->yres;
 718        mode->pixclock = var->pixclock;
 719        mode->hsync_len = var->hsync_len;
 720        mode->vsync_len = var->vsync_len;
 721        mode->left_margin = var->left_margin;
 722        mode->right_margin = var->right_margin;
 723        mode->upper_margin = var->upper_margin;
 724        mode->lower_margin = var->lower_margin;
 725        mode->sync = var->sync;
 726        mode->vmode = var->vmode & FB_VMODE_MASK;
 727        mode->flag = FB_MODE_IS_FROM_VAR;
 728        mode->refresh = 0;
 729
 730        if (!var->pixclock)
 731                return;
 732
 733        pixclock = PICOS2KHZ(var->pixclock) * 1000;
 734
 735        htotal = var->xres + var->right_margin + var->hsync_len +
 736                var->left_margin;
 737        vtotal = var->yres + var->lower_margin + var->vsync_len +
 738                var->upper_margin;
 739
 740        if (var->vmode & FB_VMODE_INTERLACED)
 741                vtotal /= 2;
 742        if (var->vmode & FB_VMODE_DOUBLE)
 743                vtotal *= 2;
 744
 745        hfreq = pixclock/htotal;
 746        mode->refresh = hfreq/vtotal;
 747}
 748
 749/**
 750 * fb_videomode_to_var - convert fb_videomode to fb_var_screeninfo
 751 * @var: pointer to struct fb_var_screeninfo
 752 * @mode: pointer to struct fb_videomode
 753 */
 754void fb_videomode_to_var(struct fb_var_screeninfo *var,
 755                         const struct fb_videomode *mode)
 756{
 757        var->xres = mode->xres;
 758        var->yres = mode->yres;
 759        var->xres_virtual = mode->xres;
 760        var->yres_virtual = mode->yres;
 761        var->xoffset = 0;
 762        var->yoffset = 0;
 763        var->pixclock = mode->pixclock;
 764        var->left_margin = mode->left_margin;
 765        var->right_margin = mode->right_margin;
 766        var->upper_margin = mode->upper_margin;
 767        var->lower_margin = mode->lower_margin;
 768        var->hsync_len = mode->hsync_len;
 769        var->vsync_len = mode->vsync_len;
 770        var->sync = mode->sync;
 771        var->vmode = mode->vmode & FB_VMODE_MASK;
 772}
 773
 774/**
 775 * fb_mode_is_equal - compare 2 videomodes
 776 * @mode1: first videomode
 777 * @mode2: second videomode
 778 *
 779 * RETURNS:
 780 * 1 if equal, 0 if not
 781 */
 782int fb_mode_is_equal(const struct fb_videomode *mode1,
 783                     const struct fb_videomode *mode2)
 784{
 785        return (mode1->xres         == mode2->xres &&
 786                mode1->yres         == mode2->yres &&
 787                mode1->pixclock     == mode2->pixclock &&
 788                mode1->hsync_len    == mode2->hsync_len &&
 789                mode1->vsync_len    == mode2->vsync_len &&
 790                mode1->left_margin  == mode2->left_margin &&
 791                mode1->right_margin == mode2->right_margin &&
 792                mode1->upper_margin == mode2->upper_margin &&
 793                mode1->lower_margin == mode2->lower_margin &&
 794                mode1->sync         == mode2->sync &&
 795                mode1->vmode        == mode2->vmode);
 796}
 797
 798/**
 799 * fb_find_best_mode - find best matching videomode
 800 * @var: pointer to struct fb_var_screeninfo
 801 * @head: pointer to struct list_head of modelist
 802 *
 803 * RETURNS:
 804 * struct fb_videomode, NULL if none found
 805 *
 806 * IMPORTANT:
 807 * This function assumes that all modelist entries in
 808 * info->modelist are valid.
 809 *
 810 * NOTES:
 811 * Finds best matching videomode which has an equal or greater dimension than
 812 * var->xres and var->yres.  If more than 1 videomode is found, will return
 813 * the videomode with the highest refresh rate
 814 */
 815const struct fb_videomode *fb_find_best_mode(const struct fb_var_screeninfo *var,
 816                                             struct list_head *head)
 817{
 818        struct list_head *pos;
 819        struct fb_modelist *modelist;
 820        struct fb_videomode *mode, *best = NULL;
 821        u32 diff = -1;
 822
 823        list_for_each(pos, head) {
 824                u32 d;
 825
 826                modelist = list_entry(pos, struct fb_modelist, list);
 827                mode = &modelist->mode;
 828
 829                if (mode->xres >= var->xres && mode->yres >= var->yres) {
 830                        d = (mode->xres - var->xres) +
 831                                (mode->yres - var->yres);
 832                        if (diff > d) {
 833                                diff = d;
 834                                best = mode;
 835                        } else if (diff == d && best &&
 836                                   mode->refresh > best->refresh)
 837                                best = mode;
 838                }
 839        }
 840        return best;
 841}
 842
 843/**
 844 * fb_find_nearest_mode - find closest videomode
 845 *
 846 * @mode: pointer to struct fb_videomode
 847 * @head: pointer to modelist
 848 *
 849 * Finds best matching videomode, smaller or greater in dimension.
 850 * If more than 1 videomode is found, will return the videomode with
 851 * the closest refresh rate.
 852 */
 853const struct fb_videomode *fb_find_nearest_mode(const struct fb_videomode *mode,
 854                                                struct list_head *head)
 855{
 856        struct list_head *pos;
 857        struct fb_modelist *modelist;
 858        struct fb_videomode *cmode, *best = NULL;
 859        u32 diff = -1, diff_refresh = -1;
 860
 861        list_for_each(pos, head) {
 862                u32 d;
 863
 864                modelist = list_entry(pos, struct fb_modelist, list);
 865                cmode = &modelist->mode;
 866
 867                d = abs(cmode->xres - mode->xres) +
 868                        abs(cmode->yres - mode->yres);
 869                if (diff > d) {
 870                        diff = d;
 871                        best = cmode;
 872                } else if (diff == d) {
 873                        d = abs(cmode->refresh - mode->refresh);
 874                        if (diff_refresh > d) {
 875                                diff_refresh = d;
 876                                best = cmode;
 877                        }
 878                }
 879        }
 880
 881        return best;
 882}
 883
 884/**
 885 * fb_match_mode - find a videomode which exactly matches the timings in var
 886 * @var: pointer to struct fb_var_screeninfo
 887 * @head: pointer to struct list_head of modelist
 888 *
 889 * RETURNS:
 890 * struct fb_videomode, NULL if none found
 891 */
 892const struct fb_videomode *fb_match_mode(const struct fb_var_screeninfo *var,
 893                                         struct list_head *head)
 894{
 895        struct list_head *pos;
 896        struct fb_modelist *modelist;
 897        struct fb_videomode *m, mode;
 898
 899        fb_var_to_videomode(&mode, var);
 900        list_for_each(pos, head) {
 901                modelist = list_entry(pos, struct fb_modelist, list);
 902                m = &modelist->mode;
 903                if (fb_mode_is_equal(m, &mode))
 904                        return m;
 905        }
 906        return NULL;
 907}
 908
 909/**
 910 * fb_add_videomode: adds videomode entry to modelist
 911 * @mode: videomode to add
 912 * @head: struct list_head of modelist
 913 *
 914 * NOTES:
 915 * Will only add unmatched mode entries
 916 */
 917int fb_add_videomode(const struct fb_videomode *mode, struct list_head *head)
 918{
 919        struct list_head *pos;
 920        struct fb_modelist *modelist;
 921        struct fb_videomode *m;
 922        int found = 0;
 923
 924        list_for_each(pos, head) {
 925                modelist = list_entry(pos, struct fb_modelist, list);
 926                m = &modelist->mode;
 927                if (fb_mode_is_equal(m, mode)) {
 928                        found = 1;
 929                        break;
 930                }
 931        }
 932        if (!found) {
 933                modelist = kmalloc(sizeof(struct fb_modelist),
 934                                                  GFP_KERNEL);
 935
 936                if (!modelist)
 937                        return -ENOMEM;
 938                modelist->mode = *mode;
 939                list_add(&modelist->list, head);
 940        }
 941        return 0;
 942}
 943
 944/**
 945 * fb_delete_videomode: removed videomode entry from modelist
 946 * @mode: videomode to remove
 947 * @head: struct list_head of modelist
 948 *
 949 * NOTES:
 950 * Will remove all matching mode entries
 951 */
 952void fb_delete_videomode(const struct fb_videomode *mode,
 953                         struct list_head *head)
 954{
 955        struct list_head *pos, *n;
 956        struct fb_modelist *modelist;
 957        struct fb_videomode *m;
 958
 959        list_for_each_safe(pos, n, head) {
 960                modelist = list_entry(pos, struct fb_modelist, list);
 961                m = &modelist->mode;
 962                if (fb_mode_is_equal(m, mode)) {
 963                        list_del(pos);
 964                        kfree(pos);
 965                }
 966        }
 967}
 968
 969/**
 970 * fb_destroy_modelist: destroy modelist
 971 * @head: struct list_head of modelist
 972 */
 973void fb_destroy_modelist(struct list_head *head)
 974{
 975        struct list_head *pos, *n;
 976
 977        list_for_each_safe(pos, n, head) {
 978                list_del(pos);
 979                kfree(pos);
 980        }
 981}
 982EXPORT_SYMBOL_GPL(fb_destroy_modelist);
 983
 984/**
 985 * fb_videomode_to_modelist: convert mode array to mode list
 986 * @modedb: array of struct fb_videomode
 987 * @num: number of entries in array
 988 * @head: struct list_head of modelist
 989 */
 990void fb_videomode_to_modelist(const struct fb_videomode *modedb, int num,
 991                              struct list_head *head)
 992{
 993        int i;
 994
 995        INIT_LIST_HEAD(head);
 996
 997        for (i = 0; i < num; i++) {
 998                if (fb_add_videomode(&modedb[i], head))
 999                        return;
1000        }

1001}
1002
1003const struct fb_videomode *fb_find_best_display(const struct fb_monspecs *specs,
1004                                                struct list_head *head)
1005{
1006        struct list_head *pos;
1007        struct fb_modelist *modelist;
1008        const struct fb_videomode *m, *m1 = NULL, *md = NULL, *best = NULL;
1009        int first = 0;
1010
1011        if (!head->prev || !head->next || list_empty(head))
1012                goto finished;
1013
1014        /* get the first detailed mode and the very first mode */
1015        list_for_each(pos, head) {
1016                modelist = list_entry(pos, struct fb_modelist, list);
1017                m = &modelist->mode;
1018
1019                if (!first) {
1020                        m1 = m;
1021                        first = 1;
1022                }
1023
1024                if (m->flag & FB_MODE_IS_FIRST) {
1025                        md = m;
1026                        break;
1027                }
1028        }
1029
1030        /* first detailed timing is preferred */
1031        if (specs->misc & FB_MISC_1ST_DETAIL) {
1032                best = md;
1033                goto finished;
1034        }
1035
1036        /* find best mode based on display width and height */
1037        if (specs->max_x && specs->max_y) {
1038                struct fb_var_screeninfo var;
1039
1040                memset(&var, 0, sizeof(struct fb_var_screeninfo));
1041                var.xres = (specs->max_x * 7200)/254;
1042                var.yres = (specs->max_y * 7200)/254;
1043                m = fb_find_best_mode(&var, head);
1044                if (m) {
1045                        best = m;
1046                        goto finished;
1047                }
1048        }
1049
1050        /* use first detailed mode */
1051        if (md) {
1052                best = md;
1053                goto finished;
1054        }
1055
1056        /* last resort, use the very first mode */
1057        best = m1;
1058finished:
1059        return best;
1060}
1061EXPORT_SYMBOL(fb_find_best_display);
1062
1063EXPORT_SYMBOL(fb_videomode_to_var);
1064EXPORT_SYMBOL(fb_var_to_videomode);
1065EXPORT_SYMBOL(fb_mode_is_equal);
1066EXPORT_SYMBOL(fb_add_videomode);
1067EXPORT_SYMBOL(fb_match_mode);
1068EXPORT_SYMBOL(fb_find_best_mode);
1069EXPORT_SYMBOL(fb_find_nearest_mode);
1070EXPORT_SYMBOL(fb_videomode_to_modelist);
1071EXPORT_SYMBOL(fb_find_mode);
1072