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SubjectRe: [PATCH v1 4/7] iio: adc: ina2xx: Do not udelay for several seconds
On Fri, 8 Dec 2017 18:41:49 +0100
Stefan Brüns <stefan.bruens@rwth-aachen.de> wrote:

> The conversion time can be up to 16 seconds (8 ms per channel, 2 channels,
> 1024 times averaging).
>
> Signed-off-by: Stefan Brüns <stefan.bruens@rwth-aachen.de>
Applied
> ---
>
> drivers/iio/adc/ina2xx-adc.c | 8 +++++---
> 1 file changed, 5 insertions(+), 3 deletions(-)
>
> diff --git a/drivers/iio/adc/ina2xx-adc.c b/drivers/iio/adc/ina2xx-adc.c
> index b027d485398b..2621a34ee5c6 100644
> --- a/drivers/iio/adc/ina2xx-adc.c
> +++ b/drivers/iio/adc/ina2xx-adc.c
> @@ -764,7 +764,7 @@ static int ina2xx_capture_thread(void *data)
> struct iio_dev *indio_dev = data;
> struct ina2xx_chip_info *chip = iio_priv(indio_dev);
> int sampling_us = SAMPLING_PERIOD(chip);
> - int buffer_us;
> + int buffer_us, delay_us;
>
> /*
> * Poll a bit faster than the chip internal Fs, in case
> @@ -778,8 +778,10 @@ static int ina2xx_capture_thread(void *data)
> if (buffer_us < 0)
> return buffer_us;
>
> - if (sampling_us > buffer_us)
> - udelay(sampling_us - buffer_us);
> + if (sampling_us > buffer_us) {
> + delay_us = sampling_us - buffer_us;
> + usleep_range(delay_us, (delay_us * 3) >> 1);
> + }
>
> } while (!kthread_should_stop());
>

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