DPIO_CHV_GAIN_CTRL_SHIFT
loopfilter |= (0x1 << DPIO_CHV_GAIN_CTRL_SHIFT);
loopfilter |= (0x3 << DPIO_CHV_GAIN_CTRL_SHIFT);
loopfilter |= (0x3 << DPIO_CHV_GAIN_CTRL_SHIFT);
loopfilter |= (0x3 << DPIO_CHV_GAIN_CTRL_SHIFT);