linux-kernel - Re: [PATCH v2 7/9] staging: iio: tsl2x7x: use usleep

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Message-ID: <20170709183121.001cdb36@kernel.org>
Date:   Sun, 9 Jul 2017 18:31:21 +0100
From:   Jonathan Cameron <jic23@...nel.org>
To:     Brian Masney <masneyb@...tation.org>
Cc:     linux-iio@...r.kernel.org, gregkh@...uxfoundation.org,
        devel@...verdev.osuosl.org, knaack.h@....de, lars@...afoo.de,
        pmeerw@...erw.net, linux-kernel@...r.kernel.org,
        Jon.Brenner@....com
Subject: Re: [PATCH v2 7/9] staging: iio: tsl2x7x: use usleep_range()
 instead of mdelay()

On Thu,  6 Jul 2017 18:56:24 -0400
Brian Masney <masneyb@...tation.org> wrote:

> This driver in some cases can busy wait for upwards of 15ms. Since the
> kernel at this point is not running in atomic context, and is running in
> process context, we can safely use usleep_range() instead. This patch
> changes the two occurrences of mdelay() to usleep_range().
> 
> Signed-off-by: Brian Masney <masneyb@...tation.org>
Applied.  Thanks,

Jonathan
> ---
>  drivers/staging/iio/light/tsl2x7x.c | 5 +++--
>  1 file changed, 3 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/staging/iio/light/tsl2x7x.c b/drivers/staging/iio/light/tsl2x7x.c
> index d80f5dc..c38bd64 100644
> --- a/drivers/staging/iio/light/tsl2x7x.c
> +++ b/drivers/staging/iio/light/tsl2x7x.c
> @@ -686,7 +686,8 @@ static int tsl2x7x_chip_on(struct iio_dev *indio_dev)
>  		}
>  	}
>  
> -	mdelay(3);	/* Power-on settling time */
> +	/* Power-on settling time */
> +	usleep_range(3000, 3500);
>  
>  	/*
>  	 * NOW enable the ADC
> @@ -853,7 +854,7 @@ static void tsl2x7x_prox_cal(struct iio_dev *indio_dev)
>  
>  	/*gather the samples*/
>  	for (i = 0; i < chip->tsl2x7x_settings.prox_max_samples_cal; i++) {
> -		mdelay(15);
> +		usleep_range(15000, 17500);
>  		tsl2x7x_get_prox(indio_dev);
>  		prox_history[i] = chip->prox_data;
>  		dev_info(&chip->client->dev, "2 i=%d prox data= %d\n",