RFCSR17_CODE
freq_offset = rt2x00_get_field8(rt2x00dev->freq_offset, RFCSR17_CODE);
rt2x00_set_field8(&rfcsr, RFCSR17_CODE, freq_offset);
prev_freq_offset = rt2x00_get_field8(prev_rfcsr, RFCSR17_CODE);
rt2x00_set_field8(&rfcsr, RFCSR17_CODE, prev_freq_offset);