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iio: xilinx-xadc: Fix ADC-B powerdown

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commit e44ec7794d upstream.

The check for shutting down the second ADC is inverted. This causes it to
be powered down when it should be enabled. As a result channels that are
supposed to be handled by the second ADC return invalid conversion results.

Signed-off-by: Lars-Peter Clausen <lars@metafoo.de>
Fixes: bdc8cda1d0 ("iio:adc: Add Xilinx XADC driver")
Cc: <Stable@vger.kernel.org>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Lars-Peter Clausen
2020-04-03 15:27:13 +02:00
committed by Chris
parent fbe066eef4
commit 3f3debcacd
1 changed files with 3 additions and 2 deletions
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5
drivers/iio/adc/xilinx-xadc-core.c
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@@ -709,13 +709,14 @@ static int xadc_power_adc_b(struct xadc *xadc, unsigned int seq_mode)
{
uint16_t val;
/* Powerdown the ADC-B when it is not needed. */
switch (seq_mode) {
case XADC_CONF1_SEQ_SIMULTANEOUS:
case XADC_CONF1_SEQ_INDEPENDENT:
val = XADC_CONF2_PD_ADC_B;
val = 0;
break;
default:
val = 0;
val = XADC_CONF2_PD_ADC_B;
break;
}