iio: adc: ti-ads1015: avoid getting stale result after runtime resume

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This driver assumes that the device is operating in the continuous
conversion mode which performs the conversion continuously.  So this driver
doesn't insert a wait time before reading the conversion register if the
configuration is not changed from a previous request.

This assumption is broken if the device is runtime suspended and entered
a power-down state.  The forthcoming request causes reading a stale result
from the conversion register as the device is runtime resumed just before.

Fix it by adding a flag to detect that condition and insert a necessary
wait time.

Cc: Daniel Baluta <daniel.baluta@gmail.com>
Signed-off-by: Akinobu Mita <akinobu.mita@gmail.com>
Cc: <Stable@vger.kernel.org>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>

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Akinobu Mita 2017-07-21 00:24:20 +09:00 • committed by Jonathan Cameron

parent e8245c6835

commit 73e3e3fc50

1 changed files with 16 additions and 2 deletions

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drivers/iio/adc/ti-ads1015.c

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