Re: [PATCH v2 03/10] iio: humidity: hts221: do not overwrite reserved data during power-down

[Jonathan Cameron <jic23-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>]

On Mon, 17 Jul 2017 19:38:58 +0200
Lorenzo Bianconi <lorenzo.bianconi83-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> wrote:

> GENMASK(6, 3) in CTRL_REG1 and GENMASK(6, 2) in CTRL_REG2 are marked
> reserved. Do not changed the original value (not declared in the
> datasheet) during power-down/suspend routines.
> 
> 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-qxv4g6HH51o@public.gmane.org>
Applied to the togreg branch of iio.git and pushed out as testing.

If we want to do a backport of this it would be fine, but it needs
to require absolute minimal changes to the driver.

Jonathan
> ---
>  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 47a29b2da1ce..6e5847386a45 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;
>  }

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