linux-kernel - Re: [PATCH 08/15] iio: sx9310: Use regmap_read_poll

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Date:   Tue, 28 Jul 2020 21:14:14 +0300
From:   Andy Shevchenko <andy.shevchenko@...il.com>
To:     Daniel Campello <campello@...omium.org>
Cc:     LKML <devicetree@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Jonathan Cameron <jic23@...nel.org>,
        Douglas Anderson <dianders@...omium.org>,
        Enrico Granata <egranata@...omium.org>,
        Gwendal Grignou <gwendal@...omium.org>,
        Hartmut Knaack <knaack.h@....de>,
        Lars-Peter Clausen <lars@...afoo.de>,
        Peter Meerwald-Stadler <pmeerw@...erw.net>,
        Stephen Boyd <swboyd@...omium.org>,
        linux-iio <linux-iio@...r.kernel.org>
Subject: Re: [PATCH 08/15] iio: sx9310: Use regmap_read_poll_timeout() for compensation

On Tue, Jul 28, 2020 at 6:15 PM Daniel Campello <campello@...omium.org> wrote:
>
> Simplify compensation stage by using regmap_read_poll_timeout().

Reviewed-by: Andy Shevchenko <andy.shevchenko@...il.com>

> Signed-off-by: Daniel Campello <campello@...omium.org>
> ---
>
>  drivers/iio/proximity/sx9310.c | 25 ++++++++++---------------
>  1 file changed, 10 insertions(+), 15 deletions(-)
>
> diff --git a/drivers/iio/proximity/sx9310.c b/drivers/iio/proximity/sx9310.c
> index 2465064971d0a7..3956fd679c6db9 100644
> --- a/drivers/iio/proximity/sx9310.c
> +++ b/drivers/iio/proximity/sx9310.c
> @@ -796,7 +796,7 @@ static const struct sx9310_reg_default sx9310_default_regs[] = {
>  static int sx9310_init_compensation(struct iio_dev *indio_dev)
>  {
>         struct sx9310_data *data = iio_priv(indio_dev);
> -       int i, ret;
> +       int ret;
>         unsigned int val;
>         unsigned int ctrl0;
>
> @@ -810,22 +810,17 @@ static int sx9310_init_compensation(struct iio_dev *indio_dev)
>         if (ret < 0)
>                 return ret;
>
> -       for (i = 100; i >= 0; i--) {
> -               msleep(20);
> -               ret = regmap_read(data->regmap, SX9310_REG_STAT1, &val);
> -               if (ret < 0)
> -                       goto out;
> -               if (!(val & SX9310_COMPSTAT_MASK))
> -                       break;
> -       }
> -
> -       if (i < 0) {
> -               dev_err(&data->client->dev,
> -                       "initial compensation timed out: 0x%02x", val);
> -               ret = -ETIMEDOUT;
> +       ret = regmap_read_poll_timeout(data->regmap, SX9310_REG_STAT1, val,
> +                                      !(val & SX9310_REG_STAT1_COMPSTAT_MASK),
> +                                      20000, 2000000);
> +       if (ret) {
> +               if (ret == -ETIMEDOUT)
> +                       dev_err(&data->client->dev,
> +                               "0x02 << 3l compensation timed out: 0x%02x",
> +                               val);
> +               return ret;
>         }
>
> -out:
>         regmap_write(data->regmap, SX9310_REG_PROX_CTRL0, ctrl0);
>         return ret;
>  }
> --
> 2.28.0.rc0.142.g3c755180ce-goog
>


-- 
With Best Regards,
Andy Shevchenko