int fb_find_mode(struct fb_var_screeninfo *var, struct fb_info *info, const char *mode_option, const struct fb_videomode *db, unsigned int dbsize, const struct fb_videomode *default_mode, unsigned int default_bpp) { int i; /* Set up defaults */ if (!db) { db = modedb; dbsize = ARRAY_SIZE(modedb); } if (!default_mode) default_mode = &db[0]; if (!default_bpp) default_bpp = 8; /* Did the user specify a video mode? */ if (!mode_option) mode_option = fb_mode_option; if (mode_option) { const char *name = mode_option; unsigned int namelen = strlen(name); int res_specified = 0, bpp_specified = 0, refresh_specified = 0; unsigned int xres = 0, yres = 0, bpp = default_bpp, refresh = 0; int yres_specified = 0, cvt = 0, rb = 0, interlace = 0, margins = 0; u32 best, diff, tdiff; for (i = namelen-1; i >= 0; i--) { switch (name[i]) { case '@': namelen = i; if (!refresh_specified && !bpp_specified && !yres_specified) { refresh = simple_strtol(&name[i+1], NULL, 10); refresh_specified = 1; if (cvt || rb) cvt = 0; } else goto done; break; case '-': namelen = i; if (!bpp_specified && !yres_specified) { bpp = simple_strtol(&name[i+1], NULL, 10); bpp_specified = 1; if (cvt || rb) cvt = 0; } else goto done; break; case 'x': if (!yres_specified) { yres = simple_strtol(&name[i+1], NULL, 10); yres_specified = 1; } else goto done; break; case '0' ... '9': break; case 'M': if (!yres_specified) cvt = 1; break; case 'R': if (!cvt) rb = 1; break; case 'm': if (!cvt) margins = 1; break; case 'i': if (!cvt) interlace = 1; break; default: goto done; } } if (i < 0 && yres_specified) { xres = simple_strtol(name, NULL, 10); res_specified = 1; } done: if (cvt) { struct fb_videomode cvt_mode; int ret; DPRINTK("CVT mode %dx%d@%dHz%s%s%s\n", xres, yres, (refresh) ? refresh : 60, (rb) ? " reduced blanking" : "", (margins) ? " with margins" : "", (interlace) ? " interlaced" : ""); memset(&cvt_mode, 0, sizeof(cvt_mode)); cvt_mode.xres = xres; cvt_mode.yres = yres; cvt_mode.refresh = (refresh) ? refresh : 60; if (interlace) cvt_mode.vmode |= FB_VMODE_INTERLACED; else cvt_mode.vmode &= ~FB_VMODE_INTERLACED; ret = fb_find_mode_cvt(&cvt_mode, margins, rb); if (!ret && !fb_try_mode(var, info, &cvt_mode, bpp)) { DPRINTK("modedb CVT: CVT mode ok\n"); return 1; } DPRINTK("CVT mode invalid, getting mode from database\n"); } DPRINTK("Trying specified video mode%s %ix%i\n", refresh_specified ? "" : " (ignoring refresh rate)", xres, yres); if (!refresh_specified) { /* * If the caller has provided a custom mode database and a * valid monspecs structure, we look for the mode with the * highest refresh rate. Otherwise we play it safe it and * try to find a mode with a refresh rate closest to the * standard 60 Hz. */ if (db != modedb && info->monspecs.vfmin && info->monspecs.vfmax && info->monspecs.hfmin && info->monspecs.hfmax && info->monspecs.dclkmax) { refresh = 1000; } else { refresh = 60; } } diff = -1; best = -1; for (i = 0; i < dbsize; i++) { if ((name_matches(db[i], name, namelen) || (res_specified && res_matches(db[i], xres, yres))) && !fb_try_mode(var, info, &db[i], bpp)) { if (refresh_specified && db[i].refresh == refresh) { return 1; } else { if (abs(db[i].refresh - refresh) < diff) { diff = abs(db[i].refresh - refresh); best = i; } } } } if (best != -1) { fb_try_mode(var, info, &db[best], bpp); return (refresh_specified) ? 2 : 1; } diff = 2 * (xres + yres); best = -1; DPRINTK("Trying best-fit modes\n"); for (i = 0; i < dbsize; i++) { DPRINTK("Trying %ix%i\n", db[i].xres, db[i].yres); if (!fb_try_mode(var, info, &db[i], bpp)) { tdiff = abs(db[i].xres - xres) + abs(db[i].yres - yres); /* * Penalize modes with resolutions smaller * than requested. */ if (xres > db[i].xres || yres > db[i].yres) tdiff += xres + yres; if (diff > tdiff) { diff = tdiff; best = i; } } } if (best != -1) { fb_try_mode(var, info, &db[best], bpp); return 5; } } DPRINTK("Trying default video mode\n"); if (!fb_try_mode(var, info, default_mode, default_bpp)) return 3; DPRINTK("Trying all modes\n"); for (i = 0; i < dbsize; i++) if (!fb_try_mode(var, info, &db[i], default_bpp)) return 4; DPRINTK("No valid mode found\n"); return 0; }
int fb_find_mode(struct fb_var_screeninfo *var, struct fb_info *info, const char *mode_option, const struct fb_videomode *db, unsigned int dbsize, const struct fb_videomode *default_mode, unsigned int default_bpp) { int i; /* Set up defaults */ if (!db) { db = modedb; dbsize = ARRAY_SIZE(modedb); } if (!default_mode) default_mode = &db[0]; if (!default_bpp) default_bpp = 8; /* Did the user specify a video mode? */ if (mode_option || (mode_option = global_mode_option)) { const char *name = mode_option; unsigned int namelen = strlen(name); int res_specified = 0, bpp_specified = 0, refresh_specified = 0; unsigned int xres = 0, yres = 0, bpp = default_bpp, refresh = 0; int yres_specified = 0, cvt = 0, rb = 0, interlace = 0, margins = 0; u32 best, diff; for (i = namelen-1; i >= 0; i--) { switch (name[i]) { case '@': namelen = i; if (!refresh_specified && !bpp_specified && !yres_specified) { refresh = my_atoi(&name[i+1]); refresh_specified = 1; if (cvt || rb) cvt = 0; } else goto done; break; case '-': namelen = i; if (!bpp_specified && !yres_specified) { bpp = my_atoi(&name[i+1]); bpp_specified = 1; if (cvt || rb) cvt = 0; } else goto done; break; case 'x': if (!yres_specified) { yres = my_atoi(&name[i+1]); yres_specified = 1; } else goto done; break; case '0' ... '9': break; case 'M': if (!yres_specified) cvt = 1; break; case 'R': if (!cvt) rb = 1; break; case 'm': if (!cvt) margins = 1; break; case 'i': if (!cvt) interlace = 1; break; default: goto done; } } if (i < 0 && yres_specified) { xres = my_atoi(name); res_specified = 1; } done: if (cvt) { struct fb_videomode cvt_mode; int ret; DPRINTK("CVT mode %dx%d@%dHz%s%s%s\n", xres, yres, (refresh) ? refresh : 60, (rb) ? " reduced blanking" : "", (margins) ? " with margins" : "", (interlace) ? " interlaced" : ""); cvt_mode.xres = xres; cvt_mode.yres = yres; cvt_mode.refresh = (refresh) ? refresh : 60; if (interlace) cvt_mode.vmode |= FB_VMODE_INTERLACED; else cvt_mode.vmode &= ~FB_VMODE_INTERLACED; ret = fb_find_mode_cvt(&cvt_mode, margins, rb); if (!ret && !fb_try_mode(var, info, &cvt_mode, bpp)) { DPRINTK("modedb CVT: CVT mode ok\n"); return 1; } DPRINTK("CVT mode invalid, getting mode from database\n"); } DPRINTK("Trying specified video mode%s %ix%i\n", refresh_specified ? "" : " (ignoring refresh rate)", xres, yres); diff = refresh; best = -1; for (i = 0; i < dbsize; i++) { if (name_matches(db[i], name, namelen) || (res_specified && res_matches(db[i], xres, yres))) { if(!fb_try_mode(var, info, &db[i], bpp)) { if(!refresh_specified || db[i].refresh == refresh) return 1; else { if(diff > abs(db[i].refresh - refresh)) { diff = abs(db[i].refresh - refresh); best = i; } } } } } if (best != -1) { fb_try_mode(var, info, &db[best], bpp); return 2; } diff = xres + yres; best = -1; DPRINTK("Trying best-fit modes\n"); for (i = 0; i < dbsize; i++) { if (xres <= db[i].xres && yres <= db[i].yres) { DPRINTK("Trying %ix%i\n", db[i].xres, db[i].yres); if (!fb_try_mode(var, info, &db[i], bpp)) { if (diff > (db[i].xres - xres) + (db[i].yres - yres)) { diff = (db[i].xres - xres) + (db[i].yres - yres); best = i; } } } } if (best != -1) { fb_try_mode(var, info, &db[best], bpp); return 5; } } DPRINTK("Trying default video mode\n"); if (!fb_try_mode(var, info, default_mode, default_bpp)) return 3; DPRINTK("Trying all modes\n"); for (i = 0; i < dbsize; i++) if (!fb_try_mode(var, info, &db[i], default_bpp)) return 4; DPRINTK("No valid mode found\n"); return 0; }