Re: [PATCH 3/9] iio: humidity: hts221: do not overwrite reserved data during power-down

[Jonathan Cameron <jic23@kernel.org>]

On Sun,  9 Jul 2017 18:56:58 +0200
Lorenzo Bianconi <lorenzo.bianconi83@gmail.com> wrote:

> Fixes: e4a70e3e7d84 (iio: humidity: add support to hts221 rh/temp device)
> Fixes: b7079eeac5da (iio: humidity: hts221: add power management support)
> Signed-off-by: Lorenzo Bianconi <lorenzo.bianconi@st.com>
This needs more description.  What is the effect of this?

Which bits of data are we writing that we shouldn't be touching?


> ---
>  drivers/iio/humidity/hts221_core.c | 10 ++++------
>  1 file changed, 4 insertions(+), 6 deletions(-)
> 
> diff --git a/drivers/iio/humidity/hts221_core.c b/drivers/iio/humidity/hts221_core.c
> index 9546b0ea6283..b36734b8070e 100644
> --- a/drivers/iio/humidity/hts221_core.c
> +++ b/drivers/iio/humidity/hts221_core.c
> @@ -305,11 +305,10 @@ int hts221_power_on(struct hts221_hw *hw)
>  
>  int hts221_power_off(struct hts221_hw *hw)
>  {
> -	__le16 data = 0;
>  	int err;
>  
> -	err = hw->tf->write(hw->dev, HTS221_REG_CNTRL1_ADDR, sizeof(data),
> -			    (u8 *)&data);
> +	err = hts221_write_with_mask(hw, HTS221_REG_CNTRL1_ADDR,
> +				     HTS221_ENABLE_MASK, false);
>  	if (err < 0)
>  		return err;
>  
> @@ -692,11 +691,10 @@ static int __maybe_unused hts221_suspend(struct device *dev)
>  {
>  	struct iio_dev *iio_dev = dev_get_drvdata(dev);
>  	struct hts221_hw *hw = iio_priv(iio_dev);
> -	__le16 data = 0;
>  	int err;
>  
> -	err = hw->tf->write(hw->dev, HTS221_REG_CNTRL1_ADDR, sizeof(data),
> -			    (u8 *)&data);
> +	err = hts221_write_with_mask(hw, HTS221_REG_CNTRL1_ADDR,
> +				     HTS221_ENABLE_MASK, false);
>  
>  	return err < 0 ? err : 0;
>  }