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path: root/drivers/iio/adc/stm32-adc.c
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Diffstat (limited to 'drivers/iio/adc/stm32-adc.c')
-rw-r--r--drivers/iio/adc/stm32-adc.c6
1 files changed, 6 insertions, 0 deletions
diff --git a/drivers/iio/adc/stm32-adc.c b/drivers/iio/adc/stm32-adc.c
index 11ef873d6453..130e8dd6f0c8 100644
--- a/drivers/iio/adc/stm32-adc.c
+++ b/drivers/iio/adc/stm32-adc.c
@@ -876,6 +876,9 @@ static void stm32h7_adc_disable(struct iio_dev *indio_dev)
int ret;
u32 val;
+ if (!(stm32_adc_readl(adc, STM32H7_ADC_CR) & STM32H7_ADEN))
+ return;
+
/* Disable ADC and wait until it's effectively disabled */
stm32_adc_set_bits(adc, STM32H7_ADC_CR, STM32H7_ADDIS);
ret = stm32_adc_readl_poll_timeout(STM32H7_ADC_CR, val,
@@ -1016,6 +1019,9 @@ static int stm32h7_adc_selfcalib(struct iio_dev *indio_dev)
if (adc->cal.calibrated)
return true;
+ /* ADC must be disabled for calibration */
+ stm32h7_adc_disable(indio_dev);
+
/*
* Select calibration mode:
* - Offset calibration for single ended inputs