PHY_CSR6
csr6 = rt2500usb_register_read(rt2x00dev, PHY_CSR6);
rt2500usb_register_write(rt2x00dev, PHY_CSR6, csr6);
rt2x00mmio_register_write(rt2x00dev, PHY_CSR6, 0x00080606);
rt2x00usb_register_write(rt2x00dev, PHY_CSR6, 0x00080606);