Commit cf59ad96 authored by Olivier Moysan's avatar Olivier Moysan Committed by Jonathan Cameron
Browse files

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: default avatarOlivier Moysan <olivier.moysan@foss.st.com>
Reviewed-by: default avatarFabrice Gasnier <fabrice.gasnier@foss.st.com>
Link: https://lore.kernel.org/r/20220620154738.801706-2-olivier.moysan@foss.st.com


Signed-off-by: default avatarJonathan Cameron <Jonathan.Cameron@huawei.com>
parent 65816728

drivers/iio/adc/stm32-adc.c

+3 −0
Original line number Diff line number Diff line
@@ -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,