FB_CVT_CELLSIZE
hblank &= ~((2 * FB_CVT_CELLSIZE) - 1);
hsync = (FB_CVT_CELLSIZE * cvt->htotal)/100;
hsync &= ~(FB_CVT_CELLSIZE - 1);
cvt.xres &= ~(FB_CVT_CELLSIZE - 1);
cvt.h_margin &= ~(FB_CVT_CELLSIZE - 1);