root/drivers/video/fbdev/core/modedb.c

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DEFINITIONS

This source file includes following definitions.
  1. fb_try_mode
  2. fb_find_mode
  3. fb_var_to_videomode
  4. fb_videomode_to_var
  5. fb_mode_is_equal
  6. fb_find_best_mode
  7. fb_find_nearest_mode
  8. fb_match_mode
  9. fb_add_videomode
  10. fb_delete_videomode
  11. fb_destroy_modelist
  12. fb_videomode_to_modelist
  13. fb_find_best_display
   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/slab.h>
  16 #include <linux/fb.h>
  17 #include <linux/kernel.h>
  18 
  19 #undef DEBUG
  20 
  21 #define name_matches(v, s, l) \
  22     ((v).name && !strncmp((s), (v).name, (l)) && strlen((v).name) == (l))
  23 #define res_matches(v, x, y) \
  24     ((v).xres == (x) && (v).yres == (y))
  25 
  26 #ifdef DEBUG
  27 #define DPRINTK(fmt, args...)   printk("modedb %s: " fmt, __func__ , ## args)
  28 #else
  29 #define DPRINTK(fmt, args...)
  30 #endif
  31 
  32 /*
  33  *  Standard video mode definitions (taken from XFree86)
  34  */
  35 
  36 static const struct fb_videomode modedb[] = {
  37 
  38         /* 640x400 @ 70 Hz, 31.5 kHz hsync */
  39         { NULL, 70, 640, 400, 39721, 40, 24, 39, 9, 96, 2, 0,
  40                 FB_VMODE_NONINTERLACED },
  41 
  42         /* 640x480 @ 60 Hz, 31.5 kHz hsync */
  43         { NULL, 60, 640, 480, 39721, 40, 24, 32, 11, 96, 2,     0,
  44                 FB_VMODE_NONINTERLACED },
  45 
  46         /* 800x600 @ 56 Hz, 35.15 kHz hsync */
  47         { NULL, 56, 800, 600, 27777, 128, 24, 22, 1, 72, 2,     0,
  48                 FB_VMODE_NONINTERLACED },
  49 
  50         /* 1024x768 @ 87 Hz interlaced, 35.5 kHz hsync */
  51         { NULL, 87, 1024, 768, 22271, 56, 24, 33, 8, 160, 8, 0,
  52                 FB_VMODE_INTERLACED },
  53 
  54         /* 640x400 @ 85 Hz, 37.86 kHz hsync */
  55         { NULL, 85, 640, 400, 31746, 96, 32, 41, 1, 64, 3,
  56                 FB_SYNC_VERT_HIGH_ACT, FB_VMODE_NONINTERLACED },
  57 
  58         /* 640x480 @ 72 Hz, 36.5 kHz hsync */
  59         { NULL, 72, 640, 480, 31746, 144, 40, 30, 8, 40, 3, 0,
  60                 FB_VMODE_NONINTERLACED },
  61 
  62         /* 640x480 @ 75 Hz, 37.50 kHz hsync */
  63         { NULL, 75, 640, 480, 31746, 120, 16, 16, 1, 64, 3,     0,
  64                 FB_VMODE_NONINTERLACED },
  65 
  66         /* 800x600 @ 60 Hz, 37.8 kHz hsync */
  67         { NULL, 60, 800, 600, 25000, 88, 40, 23, 1, 128, 4,
  68                 FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
  69                 FB_VMODE_NONINTERLACED },
  70 
  71         /* 640x480 @ 85 Hz, 43.27 kHz hsync */
  72         { NULL, 85, 640, 480, 27777, 80, 56, 25, 1, 56, 3, 0,
  73                 FB_VMODE_NONINTERLACED },
  74 
  75         /* 1152x864 @ 89 Hz interlaced, 44 kHz hsync */
  76         { NULL, 89, 1152, 864, 15384, 96, 16, 110, 1, 216, 10, 0,
  77                 FB_VMODE_INTERLACED },
  78         /* 800x600 @ 72 Hz, 48.0 kHz hsync */
  79         { NULL, 72, 800, 600, 20000, 64, 56, 23, 37, 120, 6,
  80                 FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
  81                 FB_VMODE_NONINTERLACED },
  82 
  83         /* 1024x768 @ 60 Hz, 48.4 kHz hsync */
  84         { NULL, 60, 1024, 768, 15384, 168, 8, 29, 3, 144, 6, 0,
  85                 FB_VMODE_NONINTERLACED },
  86 
  87         /* 640x480 @ 100 Hz, 53.01 kHz hsync */
  88         { NULL, 100, 640, 480, 21834, 96, 32, 36, 8, 96, 6,     0,
  89                 FB_VMODE_NONINTERLACED },
  90 
  91         /* 1152x864 @ 60 Hz, 53.5 kHz hsync */
  92         { NULL, 60, 1152, 864, 11123, 208, 64, 16, 4, 256, 8, 0,
  93                 FB_VMODE_NONINTERLACED },
  94 
  95         /* 800x600 @ 85 Hz, 55.84 kHz hsync */
  96         { NULL, 85, 800, 600, 16460, 160, 64, 36, 16, 64, 5, 0,
  97                 FB_VMODE_NONINTERLACED },
  98 
  99         /* 1024x768 @ 70 Hz, 56.5 kHz hsync */
 100         { NULL, 70, 1024, 768, 13333, 144, 24, 29, 3, 136, 6, 0,
 101                 FB_VMODE_NONINTERLACED },
 102 
 103         /* 1280x1024 @ 87 Hz interlaced, 51 kHz hsync */
 104         { NULL, 87, 1280, 1024, 12500, 56, 16, 128, 1, 216, 12, 0,
 105                 FB_VMODE_INTERLACED },
 106 
 107         /* 800x600 @ 100 Hz, 64.02 kHz hsync */
 108         { NULL, 100, 800, 600, 14357, 160, 64, 30, 4, 64, 6, 0,
 109                 FB_VMODE_NONINTERLACED },
 110 
 111         /* 1024x768 @ 76 Hz, 62.5 kHz hsync */
 112         { NULL, 76, 1024, 768, 11764, 208, 8, 36, 16, 120, 3, 0,
 113                 FB_VMODE_NONINTERLACED },
 114 
 115         /* 1152x864 @ 70 Hz, 62.4 kHz hsync */
 116         { NULL, 70, 1152, 864, 10869, 106, 56, 20, 1, 160, 10, 0,
 117                 FB_VMODE_NONINTERLACED },
 118 
 119         /* 1280x1024 @ 61 Hz, 64.2 kHz hsync */
 120         { NULL, 61, 1280, 1024, 9090, 200, 48, 26, 1, 184, 3, 0,
 121                 FB_VMODE_NONINTERLACED },
 122 
 123         /* 1400x1050 @ 60Hz, 63.9 kHz hsync */
 124         { NULL, 60, 1400, 1050, 9259, 136, 40, 13, 1, 112, 3, 0,
 125                 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,
 130                 FB_VMODE_NONINTERLACED },
 131 
 132         /* 1400x1050 @ 60 Hz, ? kHz +hsync +vsync*/
 133         { NULL, 60, 1400, 1050, 9259, 128, 40, 12, 0, 112, 3,
 134                 FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
 135                 FB_VMODE_NONINTERLACED },
 136 
 137         /* 1024x768 @ 85 Hz, 70.24 kHz hsync */
 138         { NULL, 85, 1024, 768, 10111, 192, 32, 34, 14, 160, 6, 0,
 139                 FB_VMODE_NONINTERLACED },
 140 
 141         /* 1152x864 @ 78 Hz, 70.8 kHz hsync */
 142         { NULL, 78, 1152, 864, 9090, 228, 88, 32, 0, 84, 12, 0,
 143                 FB_VMODE_NONINTERLACED },
 144 
 145         /* 1280x1024 @ 70 Hz, 74.59 kHz hsync */
 146         { NULL, 70, 1280, 1024, 7905, 224, 32, 28, 8, 160, 8, 0,
 147                 FB_VMODE_NONINTERLACED },
 148 
 149         /* 1600x1200 @ 60Hz, 75.00 kHz hsync */
 150         { NULL, 60, 1600, 1200, 6172, 304, 64, 46, 1, 192, 3,
 151                 FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
 152                 FB_VMODE_NONINTERLACED },
 153 
 154         /* 1152x864 @ 84 Hz, 76.0 kHz hsync */
 155         { NULL, 84, 1152, 864, 7407, 184, 312, 32, 0, 128, 12, 0,
 156                 FB_VMODE_NONINTERLACED },
 157 
 158         /* 1280x1024 @ 74 Hz, 78.85 kHz hsync */
 159         { NULL, 74, 1280, 1024, 7407, 256, 32, 34, 3, 144, 3, 0,
 160                 FB_VMODE_NONINTERLACED },
 161 
 162         /* 1024x768 @ 100Hz, 80.21 kHz hsync */
 163         { NULL, 100, 1024, 768, 8658, 192, 32, 21, 3, 192, 10, 0,
 164                 FB_VMODE_NONINTERLACED },
 165 
 166         /* 1280x1024 @ 76 Hz, 81.13 kHz hsync */
 167         { NULL, 76, 1280, 1024, 7407, 248, 32, 34, 3, 104, 3, 0,
 168                 FB_VMODE_NONINTERLACED },
 169 
 170         /* 1600x1200 @ 70 Hz, 87.50 kHz hsync */
 171         { NULL, 70, 1600, 1200, 5291, 304, 64, 46, 1, 192, 3, 0,
 172                 FB_VMODE_NONINTERLACED },
 173 
 174         /* 1152x864 @ 100 Hz, 89.62 kHz hsync */
 175         { NULL, 100, 1152, 864, 7264, 224, 32, 17, 2, 128, 19, 0,
 176                 FB_VMODE_NONINTERLACED },
 177 
 178         /* 1280x1024 @ 85 Hz, 91.15 kHz hsync */
 179         { NULL, 85, 1280, 1024, 6349, 224, 64, 44, 1, 160, 3,
 180                 FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
 181                 FB_VMODE_NONINTERLACED },
 182 
 183         /* 1600x1200 @ 75 Hz, 93.75 kHz hsync */
 184         { NULL, 75, 1600, 1200, 4938, 304, 64, 46, 1, 192, 3,
 185                 FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
 186                 FB_VMODE_NONINTERLACED },
 187 
 188         /* 1680x1050 @ 60 Hz, 65.191 kHz hsync */
 189         { NULL, 60, 1680, 1050, 6848, 280, 104, 30, 3, 176, 6,
 190                 FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
 191                 FB_VMODE_NONINTERLACED },
 192 
 193         /* 1600x1200 @ 85 Hz, 105.77 kHz hsync */
 194         { NULL, 85, 1600, 1200, 4545, 272, 16, 37, 4, 192, 3,
 195                 FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
 196                 FB_VMODE_NONINTERLACED },
 197 
 198         /* 1280x1024 @ 100 Hz, 107.16 kHz hsync */
 199         { NULL, 100, 1280, 1024, 5502, 256, 32, 26, 7, 128, 15, 0,
 200                 FB_VMODE_NONINTERLACED },
 201 
 202         /* 1800x1440 @ 64Hz, 96.15 kHz hsync  */
 203         { NULL, 64, 1800, 1440, 4347, 304, 96, 46, 1, 192, 3,
 204                 FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
 205                 FB_VMODE_NONINTERLACED },
 206 
 207         /* 1800x1440 @ 70Hz, 104.52 kHz hsync  */
 208         { NULL, 70, 1800, 1440, 4000, 304, 96, 46, 1, 192, 3,
 209                 FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
 210                 FB_VMODE_NONINTERLACED },
 211 
 212         /* 512x384 @ 78 Hz, 31.50 kHz hsync */
 213         { NULL, 78, 512, 384, 49603, 48, 16, 16, 1, 64, 3, 0,
 214                 FB_VMODE_NONINTERLACED },
 215 
 216         /* 512x384 @ 85 Hz, 34.38 kHz hsync */
 217         { NULL, 85, 512, 384, 45454, 48, 16, 16, 1, 64, 3, 0,
 218                 FB_VMODE_NONINTERLACED },
 219 
 220         /* 320x200 @ 70 Hz, 31.5 kHz hsync, 8:5 aspect ratio */
 221         { NULL, 70, 320, 200, 79440, 16, 16, 20, 4, 48, 1, 0,
 222                 FB_VMODE_DOUBLE },
 223 
 224         /* 320x240 @ 60 Hz, 31.5 kHz hsync, 4:3 aspect ratio */
 225         { NULL, 60, 320, 240, 79440, 16, 16, 16, 5, 48, 1, 0,
 226                 FB_VMODE_DOUBLE },
 227 
 228         /* 320x240 @ 72 Hz, 36.5 kHz hsync */
 229         { NULL, 72, 320, 240, 63492, 16, 16, 16, 4, 48, 2, 0,
 230                 FB_VMODE_DOUBLE },
 231 
 232         /* 400x300 @ 56 Hz, 35.2 kHz hsync, 4:3 aspect ratio */
 233         { NULL, 56, 400, 300, 55555, 64, 16, 10, 1, 32, 1, 0,
 234                 FB_VMODE_DOUBLE },
 235 
 236         /* 400x300 @ 60 Hz, 37.8 kHz hsync */
 237         { NULL, 60, 400, 300, 50000, 48, 16, 11, 1, 64, 2, 0,
 238                 FB_VMODE_DOUBLE },
 239 
 240         /* 400x300 @ 72 Hz, 48.0 kHz hsync */
 241         { NULL, 72, 400, 300, 40000, 32, 24, 11, 19, 64, 3,     0,
 242                 FB_VMODE_DOUBLE },
 243 
 244         /* 480x300 @ 56 Hz, 35.2 kHz hsync, 8:5 aspect ratio */
 245         { NULL, 56, 480, 300, 46176, 80, 16, 10, 1, 40, 1, 0,
 246                 FB_VMODE_DOUBLE },
 247 
 248         /* 480x300 @ 60 Hz, 37.8 kHz hsync */
 249         { NULL, 60, 480, 300, 41858, 56, 16, 11, 1, 80, 2, 0,
 250                 FB_VMODE_DOUBLE },
 251 
 252         /* 480x300 @ 63 Hz, 39.6 kHz hsync */
 253         { NULL, 63, 480, 300, 40000, 56, 16, 11, 1, 80, 2, 0,
 254                 FB_VMODE_DOUBLE },
 255 
 256         /* 480x300 @ 72 Hz, 48.0 kHz hsync */
 257         { NULL, 72, 480, 300, 33386, 40, 24, 11, 19, 80, 3, 0,
 258                 FB_VMODE_DOUBLE },
 259 
 260         /* 1920x1200 @ 60 Hz, 74.5 Khz hsync */
 261         { NULL, 60, 1920, 1200, 5177, 128, 336, 1, 38, 208, 3,
 262                 FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
 263                 FB_VMODE_NONINTERLACED },
 264 
 265         /* 1152x768, 60 Hz, PowerBook G4 Titanium I and II */
 266         { NULL, 60, 1152, 768, 14047, 158, 26, 29, 3, 136, 6,
 267                 FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
 268                 FB_VMODE_NONINTERLACED },
 269 
 270         /* 1366x768, 60 Hz, 47.403 kHz hsync, WXGA 16:9 aspect ratio */
 271         { NULL, 60, 1366, 768, 13806, 120, 10, 14, 3, 32, 5, 0,
 272                 FB_VMODE_NONINTERLACED },
 273 
 274         /* 1280x800, 60 Hz, 47.403 kHz hsync, WXGA 16:10 aspect ratio */
 275         { NULL, 60, 1280, 800, 12048, 200, 64, 24, 1, 136, 3, 0,
 276                 FB_VMODE_NONINTERLACED },
 277 
 278         /* 720x576i @ 50 Hz, 15.625 kHz hsync (PAL RGB) */
 279         { NULL, 50, 720, 576, 74074, 64, 16, 39, 5, 64, 5, 0,
 280                 FB_VMODE_INTERLACED },
 281 
 282         /* 800x520i @ 50 Hz, 15.625 kHz hsync (PAL RGB) */
 283         { NULL, 50, 800, 520, 58823, 144, 64, 72, 28, 80, 5, 0,
 284                 FB_VMODE_INTERLACED },
 285 
 286         /* 864x480 @ 60 Hz, 35.15 kHz hsync */
 287         { NULL, 60, 864, 480, 27777, 1, 1, 1, 1, 0, 0,
 288                 0, FB_VMODE_NONINTERLACED },
 289 };
 290 
 291 #ifdef CONFIG_FB_MODE_HELPERS
 292 const struct fb_videomode vesa_modes[] = {
 293         /* 0 640x350-85 VESA */
 294         { NULL, 85, 640, 350, 31746,  96, 32, 60, 32, 64, 3,
 295           FB_SYNC_HOR_HIGH_ACT, FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA},
 296         /* 1 640x400-85 VESA */
 297         { NULL, 85, 640, 400, 31746,  96, 32, 41, 01, 64, 3,
 298           FB_SYNC_VERT_HIGH_ACT, FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
 299         /* 2 720x400-85 VESA */
 300         { NULL, 85, 721, 400, 28169, 108, 36, 42, 01, 72, 3,
 301           FB_SYNC_VERT_HIGH_ACT, FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
 302         /* 3 640x480-60 VESA */
 303         { NULL, 60, 640, 480, 39682,  48, 16, 33, 10, 96, 2,
 304           0, FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
 305         /* 4 640x480-72 VESA */
 306         { NULL, 72, 640, 480, 31746, 128, 24, 29, 9, 40, 2,
 307           0, FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
 308         /* 5 640x480-75 VESA */
 309         { NULL, 75, 640, 480, 31746, 120, 16, 16, 01, 64, 3,
 310           0, FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
 311         /* 6 640x480-85 VESA */
 312         { NULL, 85, 640, 480, 27777, 80, 56, 25, 01, 56, 3,
 313           0, FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
 314         /* 7 800x600-56 VESA */
 315         { NULL, 56, 800, 600, 27777, 128, 24, 22, 01, 72, 2,
 316           FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
 317           FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
 318         /* 8 800x600-60 VESA */
 319         { NULL, 60, 800, 600, 25000, 88, 40, 23, 01, 128, 4,
 320           FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
 321           FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
 322         /* 9 800x600-72 VESA */
 323         { NULL, 72, 800, 600, 20000, 64, 56, 23, 37, 120, 6,
 324           FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
 325           FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
 326         /* 10 800x600-75 VESA */
 327         { NULL, 75, 800, 600, 20202, 160, 16, 21, 01, 80, 3,
 328           FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
 329           FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
 330         /* 11 800x600-85 VESA */
 331         { NULL, 85, 800, 600, 17761, 152, 32, 27, 01, 64, 3,
 332           FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
 333           FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
 334         /* 12 1024x768i-43 VESA */
 335         { NULL, 43, 1024, 768, 22271, 56, 8, 41, 0, 176, 8,
 336           FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
 337           FB_VMODE_INTERLACED, FB_MODE_IS_VESA },
 338         /* 13 1024x768-60 VESA */
 339         { NULL, 60, 1024, 768, 15384, 160, 24, 29, 3, 136, 6,
 340           0, FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
 341         /* 14 1024x768-70 VESA */
 342         { NULL, 70, 1024, 768, 13333, 144, 24, 29, 3, 136, 6,
 343           0, FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
 344         /* 15 1024x768-75 VESA */
 345         { NULL, 75, 1024, 768, 12690, 176, 16, 28, 1, 96, 3,
 346           FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
 347           FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
 348         /* 16 1024x768-85 VESA */
 349         { NULL, 85, 1024, 768, 10582, 208, 48, 36, 1, 96, 3,
 350           FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
 351           FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
 352         /* 17 1152x864-75 VESA */
 353         { NULL, 75, 1152, 864, 9259, 256, 64, 32, 1, 128, 3,
 354           FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
 355           FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
 356         /* 18 1280x960-60 VESA */
 357         { NULL, 60, 1280, 960, 9259, 312, 96, 36, 1, 112, 3,
 358           FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
 359           FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
 360         /* 19 1280x960-85 VESA */
 361         { NULL, 85, 1280, 960, 6734, 224, 64, 47, 1, 160, 3,
 362           FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
 363           FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
 364         /* 20 1280x1024-60 VESA */
 365         { NULL, 60, 1280, 1024, 9259, 248, 48, 38, 1, 112, 3,
 366           FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
 367           FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
 368         /* 21 1280x1024-75 VESA */
 369         { NULL, 75, 1280, 1024, 7407, 248, 16, 38, 1, 144, 3,
 370           FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
 371           FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
 372         /* 22 1280x1024-85 VESA */
 373         { NULL, 85, 1280, 1024, 6349, 224, 64, 44, 1, 160, 3,
 374           FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
 375           FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
 376         /* 23 1600x1200-60 VESA */
 377         { NULL, 60, 1600, 1200, 6172, 304, 64, 46, 1, 192, 3,
 378           FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
 379           FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
 380         /* 24 1600x1200-65 VESA */
 381         { NULL, 65, 1600, 1200, 5698, 304,  64, 46, 1, 192, 3,
 382           FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
 383           FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
 384         /* 25 1600x1200-70 VESA */
 385         { NULL, 70, 1600, 1200, 5291, 304, 64, 46, 1, 192, 3,
 386           FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
 387           FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
 388         /* 26 1600x1200-75 VESA */
 389         { NULL, 75, 1600, 1200, 4938, 304, 64, 46, 1, 192, 3,
 390           FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
 391           FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
 392         /* 27 1600x1200-85 VESA */
 393         { NULL, 85, 1600, 1200, 4357, 304, 64, 46, 1, 192, 3,
 394           FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
 395           FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
 396         /* 28 1792x1344-60 VESA */
 397         { NULL, 60, 1792, 1344, 4882, 328, 128, 46, 1, 200, 3,
 398           FB_SYNC_VERT_HIGH_ACT, FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
 399         /* 29 1792x1344-75 VESA */
 400         { NULL, 75, 1792, 1344, 3831, 352, 96, 69, 1, 216, 3,
 401           FB_SYNC_VERT_HIGH_ACT, FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
 402         /* 30 1856x1392-60 VESA */
 403         { NULL, 60, 1856, 1392, 4580, 352, 96, 43, 1, 224, 3,
 404           FB_SYNC_VERT_HIGH_ACT, FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
 405         /* 31 1856x1392-75 VESA */
 406         { NULL, 75, 1856, 1392, 3472, 352, 128, 104, 1, 224, 3,
 407           FB_SYNC_VERT_HIGH_ACT, FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
 408         /* 32 1920x1440-60 VESA */
 409         { NULL, 60, 1920, 1440, 4273, 344, 128, 56, 1, 200, 3,
 410           FB_SYNC_VERT_HIGH_ACT, FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
 411         /* 33 1920x1440-75 VESA */
 412         { NULL, 75, 1920, 1440, 3367, 352, 144, 56, 1, 224, 3,
 413           FB_SYNC_VERT_HIGH_ACT, FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
 414         /* 34 1920x1200-60 RB VESA */
 415         { NULL, 60, 1920, 1200, 6493, 80, 48, 26, 3, 32, 6,
 416           FB_SYNC_VERT_HIGH_ACT, FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
 417         /* 35 1920x1200-60 VESA */
 418         { NULL, 60, 1920, 1200, 5174, 336, 136, 36, 3, 200, 6,
 419           FB_SYNC_VERT_HIGH_ACT, FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
 420         /* 36 1920x1200-75 VESA */
 421         { NULL, 75, 1920, 1200, 4077, 344, 136, 46, 3, 208, 6,
 422           FB_SYNC_VERT_HIGH_ACT, FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
 423         /* 37 1920x1200-85 VESA */
 424         { NULL, 85, 1920, 1200, 3555, 352, 144, 53, 3, 208, 6,
 425           FB_SYNC_VERT_HIGH_ACT, FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
 426         /* 38 2560x1600-60 RB VESA */
 427         { NULL, 60, 2560, 1600, 3724, 80, 48, 37, 3, 32, 6,
 428           FB_SYNC_HOR_HIGH_ACT, FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
 429         /* 39 2560x1600-60 VESA */
 430         { NULL, 60, 2560, 1600, 2869, 472, 192, 49, 3, 280, 6,
 431           FB_SYNC_VERT_HIGH_ACT, FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
 432         /* 40 2560x1600-75 VESA */
 433         { NULL, 75, 2560, 1600, 2256, 488, 208, 63, 3, 280, 6,
 434           FB_SYNC_VERT_HIGH_ACT, FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
 435         /* 41 2560x1600-85 VESA */
 436         { NULL, 85, 2560, 1600, 1979, 488, 208, 73, 3, 280, 6,
 437           FB_SYNC_VERT_HIGH_ACT, FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
 438         /* 42 2560x1600-120 RB VESA */
 439         { NULL, 120, 2560, 1600, 1809, 80, 48, 85, 3, 32, 6,
 440           FB_SYNC_HOR_HIGH_ACT, FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
 441 };
 442 EXPORT_SYMBOL(vesa_modes);
 443 
 444 const struct dmt_videomode dmt_modes[DMT_SIZE] = {
 445         { 0x01, 0x0000, 0x000000, &vesa_modes[0] },
 446         { 0x02, 0x3119, 0x000000, &vesa_modes[1] },
 447         { 0x03, 0x0000, 0x000000, &vesa_modes[2] },
 448         { 0x04, 0x3140, 0x000000, &vesa_modes[3] },
 449         { 0x05, 0x314c, 0x000000, &vesa_modes[4] },
 450         { 0x06, 0x314f, 0x000000, &vesa_modes[5] },
 451         { 0x07, 0x3159, 0x000000, &vesa_modes[6] },
 452         { 0x08, 0x0000, 0x000000, &vesa_modes[7] },
 453         { 0x09, 0x4540, 0x000000, &vesa_modes[8] },
 454         { 0x0a, 0x454c, 0x000000, &vesa_modes[9] },
 455         { 0x0b, 0x454f, 0x000000, &vesa_modes[10] },
 456         { 0x0c, 0x4559, 0x000000, &vesa_modes[11] },
 457         { 0x0d, 0x0000, 0x000000, NULL },
 458         { 0x0e, 0x0000, 0x000000, NULL },
 459         { 0x0f, 0x0000, 0x000000, &vesa_modes[12] },
 460         { 0x10, 0x6140, 0x000000, &vesa_modes[13] },
 461         { 0x11, 0x614a, 0x000000, &vesa_modes[14] },
 462         { 0x12, 0x614f, 0x000000, &vesa_modes[15] },
 463         { 0x13, 0x6159, 0x000000, &vesa_modes[16] },
 464         { 0x14, 0x0000, 0x000000, NULL },
 465         { 0x15, 0x714f, 0x000000, &vesa_modes[17] },
 466         { 0x16, 0x0000, 0x7f1c21, NULL },
 467         { 0x17, 0x0000, 0x7f1c28, NULL },
 468         { 0x18, 0x0000, 0x7f1c44, NULL },
 469         { 0x19, 0x0000, 0x7f1c62, NULL },
 470         { 0x1a, 0x0000, 0x000000, NULL },
 471         { 0x1b, 0x0000, 0x8f1821, NULL },
 472         { 0x1c, 0x8100, 0x8f1828, NULL },
 473         { 0x1d, 0x810f, 0x8f1844, NULL },
 474         { 0x1e, 0x8119, 0x8f1862, NULL },
 475         { 0x1f, 0x0000, 0x000000, NULL },
 476         { 0x20, 0x8140, 0x000000, &vesa_modes[18] },
 477         { 0x21, 0x8159, 0x000000, &vesa_modes[19] },
 478         { 0x22, 0x0000, 0x000000, NULL },
 479         { 0x23, 0x8180, 0x000000, &vesa_modes[20] },
 480         { 0x24, 0x818f, 0x000000, &vesa_modes[21] },
 481         { 0x25, 0x8199, 0x000000, &vesa_modes[22] },
 482         { 0x26, 0x0000, 0x000000, NULL },
 483         { 0x27, 0x0000, 0x000000, NULL },
 484         { 0x28, 0x0000, 0x000000, NULL },
 485         { 0x29, 0x0000, 0x0c2021, NULL },
 486         { 0x2a, 0x9040, 0x0c2028, NULL },
 487         { 0x2b, 0x904f, 0x0c2044, NULL },
 488         { 0x2c, 0x9059, 0x0c2062, NULL },
 489         { 0x2d, 0x0000, 0x000000, NULL },
 490         { 0x2e, 0x9500, 0xc11821, NULL },
 491         { 0x2f, 0x9500, 0xc11828, NULL },
 492         { 0x30, 0x950f, 0xc11844, NULL },
 493         { 0x31, 0x9519, 0xc11868, NULL },
 494         { 0x32, 0x0000, 0x000000, NULL },
 495         { 0x33, 0xa940, 0x000000, &vesa_modes[23] },
 496         { 0x34, 0xa945, 0x000000, &vesa_modes[24] },
 497         { 0x35, 0xa94a, 0x000000, &vesa_modes[25] },
 498         { 0x36, 0xa94f, 0x000000, &vesa_modes[26] },
 499         { 0x37, 0xa959, 0x000000, &vesa_modes[27] },
 500         { 0x38, 0x0000, 0x000000, NULL },
 501         { 0x39, 0x0000, 0x0c2821, NULL },
 502         { 0x3a, 0xb300, 0x0c2828, NULL },
 503         { 0x3b, 0xb30f, 0x0c2844, NULL },
 504         { 0x3c, 0xb319, 0x0c2868, NULL },
 505         { 0x3d, 0x0000, 0x000000, NULL },
 506         { 0x3e, 0xc140, 0x000000, &vesa_modes[28] },
 507         { 0x3f, 0xc14f, 0x000000, &vesa_modes[29] },
 508         { 0x40, 0x0000, 0x000000, NULL},
 509         { 0x41, 0xc940, 0x000000, &vesa_modes[30] },
 510         { 0x42, 0xc94f, 0x000000, &vesa_modes[31] },
 511         { 0x43, 0x0000, 0x000000, NULL },
 512         { 0x44, 0x0000, 0x572821, &vesa_modes[34] },
 513         { 0x45, 0xd100, 0x572828, &vesa_modes[35] },
 514         { 0x46, 0xd10f, 0x572844, &vesa_modes[36] },
 515         { 0x47, 0xd119, 0x572862, &vesa_modes[37] },
 516         { 0x48, 0x0000, 0x000000, NULL },
 517         { 0x49, 0xd140, 0x000000, &vesa_modes[32] },
 518         { 0x4a, 0xd14f, 0x000000, &vesa_modes[33] },
 519         { 0x4b, 0x0000, 0x000000, NULL },
 520         { 0x4c, 0x0000, 0x1f3821, &vesa_modes[38] },
 521         { 0x4d, 0x0000, 0x1f3828, &vesa_modes[39] },
 522         { 0x4e, 0x0000, 0x1f3844, &vesa_modes[40] },
 523         { 0x4f, 0x0000, 0x1f3862, &vesa_modes[41] },
 524         { 0x50, 0x0000, 0x000000, &vesa_modes[42] },
 525 };
 526 EXPORT_SYMBOL(dmt_modes);
 527 #endif /* CONFIG_FB_MODE_HELPERS */
 528 
 529 /**
 530  *      fb_try_mode - test a video mode
 531  *      @var: frame buffer user defined part of display
 532  *      @info: frame buffer info structure
 533  *      @mode: frame buffer video mode structure
 534  *      @bpp: color depth in bits per pixel
 535  *
 536  *      Tries a video mode to test it's validity for device @info.
 537  *
 538  *      Returns 1 on success.
 539  *
 540  */
 541 
 542 static int fb_try_mode(struct fb_var_screeninfo *var, struct fb_info *info,
 543                        const struct fb_videomode *mode, unsigned int bpp)
 544 {
 545         int err = 0;
 546 
 547         DPRINTK("Trying mode %s %dx%d-%d@%d\n",
 548                 mode->name ? mode->name : "noname",
 549                 mode->xres, mode->yres, bpp, mode->refresh);
 550         var->xres = mode->xres;
 551         var->yres = mode->yres;
 552         var->xres_virtual = mode->xres;
 553         var->yres_virtual = mode->yres;
 554         var->xoffset = 0;
 555         var->yoffset = 0;
 556         var->bits_per_pixel = bpp;
 557         var->activate |= FB_ACTIVATE_TEST;
 558         var->pixclock = mode->pixclock;
 559         var->left_margin = mode->left_margin;
 560         var->right_margin = mode->right_margin;
 561         var->upper_margin = mode->upper_margin;
 562         var->lower_margin = mode->lower_margin;
 563         var->hsync_len = mode->hsync_len;
 564         var->vsync_len = mode->vsync_len;
 565         var->sync = mode->sync;
 566         var->vmode = mode->vmode;
 567         if (info->fbops->fb_check_var)
 568                 err = info->fbops->fb_check_var(var, info);
 569         var->activate &= ~FB_ACTIVATE_TEST;
 570         return err;
 571 }
 572 
 573 /**
 574  * fb_find_mode - finds a valid video mode
 575  * @var: frame buffer user defined part of display
 576  * @info: frame buffer info structure
 577  * @mode_option: string video mode to find
 578  * @db: video mode database
 579  * @dbsize: size of @db
 580  * @default_mode: default video mode to fall back to
 581  * @default_bpp: default color depth in bits per pixel
 582  *
 583  * Finds a suitable video mode, starting with the specified mode
 584  * in @mode_option with fallback to @default_mode.  If
 585  * @default_mode fails, all modes in the video mode database will
 586  * be tried.
 587  *
 588  * Valid mode specifiers for @mode_option::
 589  *
 590  *     <xres>x<yres>[M][R][-<bpp>][@<refresh>][i][p][m]
 591  *
 592  * or ::
 593  *
 594  *     <name>[-<bpp>][@<refresh>]
 595  *
 596  * with <xres>, <yres>, <bpp> and <refresh> decimal numbers and
 597  * <name> a string.
 598  *
 599  * If 'M' is present after yres (and before refresh/bpp if present),
 600  * the function will compute the timings using VESA(tm) Coordinated
 601  * Video Timings (CVT).  If 'R' is present after 'M', will compute with
 602  * reduced blanking (for flatpanels).  If 'i' or 'p' are present, compute
 603  * interlaced or progressive mode.  If 'm' is present, add margins equal
 604  * to 1.8% of xres rounded down to 8 pixels, and 1.8% of yres. The char
 605  * 'i', 'p' and 'm' must be after 'M' and 'R'. Example::
 606  *
 607  *     1024x768MR-8@60m - Reduced blank with margins at 60Hz.
 608  *
 609  * NOTE: The passed struct @var is _not_ cleared!  This allows you
 610  * to supply values for e.g. the grayscale and accel_flags fields.
 611  *
 612  * Returns zero for failure, 1 if using specified @mode_option,
 613  * 2 if using specified @mode_option with an ignored refresh rate,
 614  * 3 if default mode is used, 4 if fall back to any valid mode.
 615  */
 616 
 617 int fb_find_mode(struct fb_var_screeninfo *var,
 618                  struct fb_info *info, const char *mode_option,
 619                  const struct fb_videomode *db, unsigned int dbsize,
 620                  const struct fb_videomode *default_mode,
 621                  unsigned int default_bpp)
 622 {
 623         int i;
 624 
 625         /* Set up defaults */
 626         if (!db) {
 627                 db = modedb;
 628                 dbsize = ARRAY_SIZE(modedb);
 629         }
 630 
 631         if (!default_mode)
 632                 default_mode = &db[0];
 633 
 634         if (!default_bpp)
 635                 default_bpp = 8;
 636 
 637         /* Did the user specify a video mode? */
 638         if (!mode_option)
 639                 mode_option = fb_mode_option;
 640         if (mode_option) {
 641                 const char *name = mode_option;
 642                 unsigned int namelen = strlen(name);
 643                 int res_specified = 0, bpp_specified = 0, refresh_specified = 0;
 644                 unsigned int xres = 0, yres = 0, bpp = default_bpp, refresh = 0;
 645                 int yres_specified = 0, cvt = 0, rb = 0;
 646                 int interlace_specified = 0, interlace = 0;
 647                 int margins = 0;
 648                 u32 best, diff, tdiff;
 649 
 650                 for (i = namelen-1; i >= 0; i--) {
 651                         switch (name[i]) {
 652                         case '@':
 653                                 namelen = i;
 654                                 if (!refresh_specified && !bpp_specified &&
 655                                     !yres_specified) {
 656                                         refresh = simple_strtol(&name[i+1], NULL,
 657                                                                 10);
 658                                         refresh_specified = 1;
 659                                         if (cvt || rb)
 660                                                 cvt = 0;
 661                                 } else
 662                                         goto done;
 663                                 break;
 664                         case '-':
 665                                 namelen = i;
 666                                 if (!bpp_specified && !yres_specified) {
 667                                         bpp = simple_strtol(&name[i+1], NULL,
 668                                                             10);
 669                                         bpp_specified = 1;
 670                                         if (cvt || rb)
 671                                                 cvt = 0;
 672                                 } else
 673                                         goto done;
 674                                 break;
 675                         case 'x':
 676                                 if (!yres_specified) {
 677                                         yres = simple_strtol(&name[i+1], NULL,
 678                                                              10);
 679                                         yres_specified = 1;
 680                                 } else
 681                                         goto done;
 682                                 break;
 683                         case '0' ... '9':
 684                                 break;
 685                         case 'M':
 686                                 if (!yres_specified)
 687                                         cvt = 1;
 688                                 break;
 689                         case 'R':
 690                                 if (!cvt)
 691                                         rb = 1;
 692                                 break;
 693                         case 'm':
 694                                 if (!cvt)
 695                                         margins = 1;
 696                                 break;
 697                         case 'p':
 698                                 if (!cvt) {
 699                                         interlace = 0;
 700                                         interlace_specified = 1;
 701                                 }
 702                                 break;
 703                         case 'i':
 704                                 if (!cvt) {
 705                                         interlace = 1;
 706                                         interlace_specified = 1;
 707                                 }
 708                                 break;
 709                         default:
 710                                 goto done;
 711                         }
 712                 }
 713                 if (i < 0 && yres_specified) {
 714                         xres = simple_strtol(name, NULL, 10);
 715                         res_specified = 1;
 716                 }
 717 done:
 718                 if (cvt) {
 719                         struct fb_videomode cvt_mode;
 720                         int ret;
 721 
 722                         DPRINTK("CVT mode %dx%d@%dHz%s%s%s\n", xres, yres,
 723                                 (refresh) ? refresh : 60,
 724                                 (rb) ? " reduced blanking" : "",
 725                                 (margins) ? " with margins" : "",
 726                                 (interlace) ? " interlaced" : "");
 727 
 728                         memset(&cvt_mode, 0, sizeof(cvt_mode));
 729                         cvt_mode.xres = xres;
 730                         cvt_mode.yres = yres;
 731                         cvt_mode.refresh = (refresh) ? refresh : 60;
 732 
 733                         if (interlace)
 734                                 cvt_mode.vmode |= FB_VMODE_INTERLACED;
 735                         else
 736                                 cvt_mode.vmode &= ~FB_VMODE_INTERLACED;
 737 
 738                         ret = fb_find_mode_cvt(&cvt_mode, margins, rb);
 739 
 740                         if (!ret && !fb_try_mode(var, info, &cvt_mode, bpp)) {
 741                                 DPRINTK("modedb CVT: CVT mode ok\n");
 742                                 return 1;
 743                         }
 744 
 745                         DPRINTK("CVT mode invalid, getting mode from database\n");
 746                 }
 747 
 748                 DPRINTK("Trying specified video mode%s %ix%i\n",
 749                         refresh_specified ? "" : " (ignoring refresh rate)",
 750                         xres, yres);
 751 
 752                 if (!refresh_specified) {
 753                         /*
 754                          * If the caller has provided a custom mode database and
 755                          * a valid monspecs structure, we look for the mode with
 756                          * the highest refresh rate.  Otherwise we play it safe
 757                          * it and try to find a mode with a refresh rate closest
 758                          * to the standard 60 Hz.
 759                          */
 760                         if (db != modedb &&
 761                             info->monspecs.vfmin && info->monspecs.vfmax &&
 762                             info->monspecs.hfmin && info->monspecs.hfmax &&
 763                             info->monspecs.dclkmax) {
 764                                 refresh = 1000;
 765                         } else {
 766                                 refresh = 60;
 767                         }
 768                 }
 769 
 770                 diff = -1;
 771                 best = -1;
 772                 for (i = 0; i < dbsize; i++) {
 773                         if ((name_matches(db[i], name, namelen) ||
 774                              (res_specified && res_matches(db[i], xres, yres))) &&
 775                             !fb_try_mode(var, info, &db[i], bpp)) {
 776                                 const int db_interlace = (db[i].vmode &
 777                                         FB_VMODE_INTERLACED ? 1 : 0);
 778                                 int score = abs(db[i].refresh - refresh);
 779 
 780                                 if (interlace_specified)
 781                                         score += abs(db_interlace - interlace);
 782 
 783                                 if (!interlace_specified ||
 784                                     db_interlace == interlace)
 785                                         if (refresh_specified &&
 786                                             db[i].refresh == refresh)
 787                                                 return 1;
 788 
 789                                 if (score < diff) {
 790                                         diff = score;
 791                                         best = i;
 792                                 }
 793                         }
 794                 }
 795                 if (best != -1) {
 796                         fb_try_mode(var, info, &db[best], bpp);
 797                         return (refresh_specified) ? 2 : 1;
 798                 }
 799 
 800                 diff = 2 * (xres + yres);
 801                 best = -1;
 802                 DPRINTK("Trying best-fit modes\n");
 803                 for (i = 0; i < dbsize; i++) {
 804                         DPRINTK("Trying %ix%i\n", db[i].xres, db[i].yres);
 805                         if (!fb_try_mode(var, info, &db[i], bpp)) {
 806                                 tdiff = abs(db[i].xres - xres) +
 807                                         abs(db[i].yres - yres);
 808 
 809                                 /*
 810                                  * Penalize modes with resolutions smaller
 811                                  * than requested.
 812                                  */
 813                                 if (xres > db[i].xres || yres > db[i].yres)
 814                                         tdiff += xres + yres;
 815 
 816                                 if (diff > tdiff) {
 817                                         diff = tdiff;
 818                                         best = i;
 819                                 }
 820                         }
 821                 }
 822                 if (best != -1) {
 823                         fb_try_mode(var, info, &db[best], bpp);
 824                         return 5;
 825                 }
 826         }
 827 
 828         DPRINTK("Trying default video mode\n");
 829         if (!fb_try_mode(var, info, default_mode, default_bpp))
 830                 return 3;
 831 
 832         DPRINTK("Trying all modes\n");
 833         for (i = 0; i < dbsize; i++)
 834                 if (!fb_try_mode(var, info, &db[i], default_bpp))
 835                         return 4;
 836 
 837         DPRINTK("No valid mode found\n");
 838         return 0;
 839 }
 840 
 841 /**
 842  * fb_var_to_videomode - convert fb_var_screeninfo to fb_videomode
 843  * @mode: pointer to struct fb_videomode
 844  * @var: pointer to struct fb_var_screeninfo
 845  */
 846 void fb_var_to_videomode(struct fb_videomode *mode,
 847                          const struct fb_var_screeninfo *var)
 848 {
 849         u32 pixclock, hfreq, htotal, vtotal;
 850 
 851         mode->name = NULL;
 852         mode->xres = var->xres;
 853         mode->yres = var->yres;
 854         mode->pixclock = var->pixclock;
 855         mode->hsync_len = var->hsync_len;
 856         mode->vsync_len = var->vsync_len;
 857         mode->left_margin = var->left_margin;
 858         mode->right_margin = var->right_margin;
 859         mode->upper_margin = var->upper_margin;
 860         mode->lower_margin = var->lower_margin;
 861         mode->sync = var->sync;
 862         mode->vmode = var->vmode & FB_VMODE_MASK;
 863         mode->flag = FB_MODE_IS_FROM_VAR;
 864         mode->refresh = 0;
 865 
 866         if (!var->pixclock)
 867                 return;
 868 
 869         pixclock = PICOS2KHZ(var->pixclock) * 1000;
 870 
 871         htotal = var->xres + var->right_margin + var->hsync_len +
 872                 var->left_margin;
 873         vtotal = var->yres + var->lower_margin + var->vsync_len +
 874                 var->upper_margin;
 875 
 876         if (var->vmode & FB_VMODE_INTERLACED)
 877                 vtotal /= 2;
 878         if (var->vmode & FB_VMODE_DOUBLE)
 879                 vtotal *= 2;
 880 
 881         if (!htotal || !vtotal)
 882                 return;
 883 
 884         hfreq = pixclock/htotal;
 885         mode->refresh = hfreq/vtotal;
 886 }
 887 
 888 /**
 889  * fb_videomode_to_var - convert fb_videomode to fb_var_screeninfo
 890  * @var: pointer to struct fb_var_screeninfo
 891  * @mode: pointer to struct fb_videomode
 892  */
 893 void fb_videomode_to_var(struct fb_var_screeninfo *var,
 894                          const struct fb_videomode *mode)
 895 {
 896         var->xres = mode->xres;
 897         var->yres = mode->yres;
 898         var->xres_virtual = mode->xres;
 899         var->yres_virtual = mode->yres;
 900         var->xoffset = 0;
 901         var->yoffset = 0;
 902         var->pixclock = mode->pixclock;
 903         var->left_margin = mode->left_margin;
 904         var->right_margin = mode->right_margin;
 905         var->upper_margin = mode->upper_margin;
 906         var->lower_margin = mode->lower_margin;
 907         var->hsync_len = mode->hsync_len;
 908         var->vsync_len = mode->vsync_len;
 909         var->sync = mode->sync;
 910         var->vmode = mode->vmode & FB_VMODE_MASK;
 911 }
 912 
 913 /**
 914  * fb_mode_is_equal - compare 2 videomodes
 915  * @mode1: first videomode
 916  * @mode2: second videomode
 917  *
 918  * RETURNS:
 919  * 1 if equal, 0 if not
 920  */
 921 int fb_mode_is_equal(const struct fb_videomode *mode1,
 922                      const struct fb_videomode *mode2)
 923 {
 924         return (mode1->xres         == mode2->xres &&
 925                 mode1->yres         == mode2->yres &&
 926                 mode1->pixclock     == mode2->pixclock &&
 927                 mode1->hsync_len    == mode2->hsync_len &&
 928                 mode1->vsync_len    == mode2->vsync_len &&
 929                 mode1->left_margin  == mode2->left_margin &&
 930                 mode1->right_margin == mode2->right_margin &&
 931                 mode1->upper_margin == mode2->upper_margin &&
 932                 mode1->lower_margin == mode2->lower_margin &&
 933                 mode1->sync         == mode2->sync &&
 934                 mode1->vmode        == mode2->vmode);
 935 }
 936 
 937 /**
 938  * fb_find_best_mode - find best matching videomode
 939  * @var: pointer to struct fb_var_screeninfo
 940  * @head: pointer to struct list_head of modelist
 941  *
 942  * RETURNS:
 943  * struct fb_videomode, NULL if none found
 944  *
 945  * IMPORTANT:
 946  * This function assumes that all modelist entries in
 947  * info->modelist are valid.
 948  *
 949  * NOTES:
 950  * Finds best matching videomode which has an equal or greater dimension than
 951  * var->xres and var->yres.  If more than 1 videomode is found, will return
 952  * the videomode with the highest refresh rate
 953  */
 954 const struct fb_videomode *fb_find_best_mode(const struct fb_var_screeninfo *var,
 955                                              struct list_head *head)
 956 {
 957         struct list_head *pos;
 958         struct fb_modelist *modelist;
 959         struct fb_videomode *mode, *best = NULL;
 960         u32 diff = -1;
 961 
 962         list_for_each(pos, head) {
 963                 u32 d;
 964 
 965                 modelist = list_entry(pos, struct fb_modelist, list);
 966                 mode = &modelist->mode;
 967 
 968                 if (mode->xres >= var->xres && mode->yres >= var->yres) {
 969                         d = (mode->xres - var->xres) +
 970                                 (mode->yres - var->yres);
 971                         if (diff > d) {
 972                                 diff = d;
 973                                 best = mode;
 974                         } else if (diff == d && best &&
 975                                    mode->refresh > best->refresh)
 976                                 best = mode;
 977                 }
 978         }
 979         return best;
 980 }
 981 
 982 /**
 983  * fb_find_nearest_mode - find closest videomode
 984  *
 985  * @mode: pointer to struct fb_videomode
 986  * @head: pointer to modelist
 987  *
 988  * Finds best matching videomode, smaller or greater in dimension.
 989  * If more than 1 videomode is found, will return the videomode with
 990  * the closest refresh rate.
 991  */
 992 const struct fb_videomode *fb_find_nearest_mode(const struct fb_videomode *mode,
 993                                                 struct list_head *head)
 994 {
 995         struct list_head *pos;
 996         struct fb_modelist *modelist;
 997         struct fb_videomode *cmode, *best = NULL;
 998         u32 diff = -1, diff_refresh = -1;
 999 
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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