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authorLars-Peter Clausen <lars@metafoo.de>2020-04-03 15:27:13 +0200
committerJonathan Cameron <Jonathan.Cameron@huawei.com>2020-04-19 17:50:01 +0100
commite44ec7794d88f918805d700240211a9ec05ed89d (patch)
tree96ad7bc4e0ea500beaa638fc02a5a89e9f6e6944 /drivers/iio/adc
parentdd6230ba1d6b413f1a60301dbd554b90870aabc6 (diff)
downloadlinux-e44ec7794d88f918805d700240211a9ec05ed89d.tar.gz
iio: xilinx-xadc: Fix ADC-B powerdown
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: bdc8cda1d010 ("iio:adc: Add Xilinx XADC driver") Cc: <Stable@vger.kernel.org> Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Diffstat (limited to 'drivers/iio/adc')
-rw-r--r--drivers/iio/adc/xilinx-xadc-core.c5
1 files changed, 3 insertions, 2 deletions
diff --git a/drivers/iio/adc/xilinx-xadc-core.c b/drivers/iio/adc/xilinx-xadc-core.c
index ec227b358cd6..f50e04a8b0ec 100644
--- a/drivers/iio/adc/xilinx-xadc-core.c
+++ b/drivers/iio/adc/xilinx-xadc-core.c
@@ -722,13 +722,14 @@ 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;
}