Man page 9 : fb_find_best_mode

fb_find_best_mode - find best matching videomode

const struct fb_videomode * fb_find_best_mode(const struct fb_var_screeninfo *  var , struct list_head *  head );

var
    pointer to struct fb_var_screeninfo

head
    pointer to struct list_head of modelist

struct fb_videomode, NULL if none found

This function assumes that all modelist entries in info->modelist are valid.

Finds best matching videomode which has an equal or greater dimension than var->xres and var->yres. If more than 1 videomode is found, will return the videomode with the highest refresh rate