[PATCH 5.4 091/168] iio: xilinx-xadc: Fix ADC-B powerdown

[Greg Kroah-Hartman]

From: Lars-Peter Clausen <l...@metafoo.de>

commit e44ec7794d88f918805d700240211a9ec05ed89d 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 <l...@metafoo.de>
Fixes: bdc8cda1d010 ("iio:adc: Add Xilinx XADC driver")
Cc: <sta...@vger.kernel.org>
Signed-off-by: Jonathan Cameron <jonathan.came...@huawei.com>
Signed-off-by: Greg Kroah-Hartman <gre...@linuxfoundation.org>

---
 drivers/iio/adc/xilinx-xadc-core.c |    5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

--- 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
 {
        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;
        }