RT3593_VCOCAL
rf |= RT3593_VCOCAL;
rt3090_rf_write(sc, 3, rf | RT3593_VCOCAL);
rf |= RT3593_VCO_IC | RT3593_VCOCAL;
rt3090_rf_write(sc, 3, rt3090_rf_read(sc, 3) | RT3593_VCOCAL);
rf &= ~RT3593_VCOCAL;
rf |= (chan <= 14) ? RT3593_VCOCAL : 0xbe;
rf |= RT3593_VCOCAL;
rf |= RT3593_VCOCAL;