tree 963771037ce6cdcf0f27604070ad6eb2bccf7aae
parent 90938ca432e6b8f6bb1c22a24984738fc3d906ed
author Stefan Brüns <stefan.bruens@rwth-aachen.de> 1501104726 +0200
committer Jonathan Cameron <Jonathan.Cameron@huawei.com> 1501422619 +0100

iio: adc: ina219: Avoid underflow for sleeping time

Proper support for the INA219 lowered the minimum sampling period from
2*140us to 2*84us. Subtracting 200us later leads to an underflow and
an almost infinite udelay later.

Using a signed int for the sampling period provides sufficient range
(at most 2*8640*1024us), but catches the underflow when comparing with
buffer_us.

Fixes: 18edac2e22f4 ("iio: adc: Fix integration time/averaging for INA219/220")
Signed-off-by: Stefan Brüns <stefan.bruens@rwth-aachen.de>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>