diff options
| author | Olivier Moysan <olivier.moysan@foss.st.com> | 2022-06-20 17:47:37 +0200 |
|---|---|---|
| committer | Jonathan Cameron <Jonathan.Cameron@huawei.com> | 2022-07-01 12:19:08 +0200 |
| commit | cf59ad968bb70b304bd4489428135072fb4871e3 (patch) | |
| tree | 75b46450f5285edf4bb627f542207215162b1801 /drivers/iio/adc/stm32-adc.c | |
| parent | iio: dac: ad5380: align '*' each line and drop unneeded blank line (diff) | |
| download | linux-cf59ad968bb70b304bd4489428135072fb4871e3.tar.xz linux-cf59ad968bb70b304bd4489428135072fb4871e3.zip | |
iio: adc: stm32-adc: make safe adc disable
From ADC reference manual the software is allowed to write the
control bit ADDIS of the ADC_CR register only if the ADC is enabled.
Return immediately from stm32h7_adc_disable() if ADC is already disabled.
Signed-off-by: Olivier Moysan <olivier.moysan@foss.st.com>
Reviewed-by: Fabrice Gasnier <fabrice.gasnier@foss.st.com>
Link: https://lore.kernel.org/r/20220620154738.801706-2-olivier.moysan@foss.st.com
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Diffstat (limited to 'drivers/iio/adc/stm32-adc.c')
| -rw-r--r-- | drivers/iio/adc/stm32-adc.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/drivers/iio/adc/stm32-adc.c b/drivers/iio/adc/stm32-adc.c index a68ecbda6480..80e333f65ddd 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, |