iv/linux
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

iio: adc: stm32-adc: make safe adc disable

Browse Source 
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>
This commit is contained in:
Olivier Moysan 2022-06-20 17:47:37 +02:00 committed by Jonathan Cameron
parent 6581672896
commit cf59ad968b
1 changed files with 3 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

3
drivers/iio/adc/stm32-adc.c
View File

@ -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,