SUN6I_GBL_CTL_REG
reg = sun6i_spi_read(sspi, SUN6I_GBL_CTL_REG);
sun6i_spi_write(sspi, SUN6I_GBL_CTL_REG, reg);
sun6i_spi_write(sspi, SUN6I_GBL_CTL_REG,