- vco_step = F_OUT_STEP * lo_div;
- thresh = (F_REF * R_REF) / vco_step;
- frac = 1ul * thresh * m / (F_REF * R_REF);
+ /* Calculate PLL integer and fractional control word. */
+ f_vco = (u64) (f_rf + f_if + f_if1) * div_lo;
+ div_n = div_u64_rem(f_vco, DIV_PRE_N * F_REF, &k);
+ k_thresh = (DIV_PRE_N * F_REF) / F_VCO_STEP;
+ k_frac = div_u64((u64) k * k_thresh, (DIV_PRE_N * F_REF));