I2_DFT_CTRL
em_read_phy_reg(hw, I2_DFT_CTRL, &phy_reg);
ret_val = em_write_phy_reg(hw, I2_DFT_CTRL, phy_reg | (1 << 14));
dft_ret_val = em_write_phy_reg(hw, I2_DFT_CTRL, phy_reg & ~(1 << 14));