US_CYC_CNT
reg = rt2800_register_read(rt2x00dev, US_CYC_CNT);
rt2800_register_write(rt2x00dev, US_CYC_CNT, reg);
reg = rt2800_register_read(rt2x00dev, US_CYC_CNT);
rt2800_register_write(rt2x00dev, US_CYC_CNT, reg);
reg = rt2800_register_read(rt2x00dev, US_CYC_CNT);
rt2800_register_write(rt2x00dev, US_CYC_CNT, reg);