mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-27 19:29:37 +00:00
iio: adc: stm32: fix a current leak by resetting pcsel before disabling vdda
commitf711f28e71
upstream. Some I/Os are connected to ADC input channels, when the corresponding bit in PCSEL register are set on STM32H7 and STM32MP15. This is done in the prepare routine of stm32-adc driver. There are constraints here, as PCSEL shouldn't be set when VDDA supply is disabled. Enabling/disabling of VDDA supply in done via stm32-adc-core runtime PM routines (before/after ADC is enabled/disabled). Currently, PCSEL remains set when disabling ADC. Later on, PM runtime can disable the VDDA supply. This creates some conditions on I/Os that can start to leak current. So PCSEL needs to be cleared when disabling the ADC. Fixes:95e339b6e8
("iio: adc: stm32: add support for STM32H7") Signed-off-by: Fabrice Gasnier <fabrice.gasnier@foss.st.com> Reviewed-by: Olivier Moysan <olivier.moysan@foss.st.com> Link: https://lore.kernel.org/r/1634905169-23762-1-git-send-email-fabrice.gasnier@foss.st.com Cc: <Stable@vger.kernel.org> Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
parent
0d3277eabd
commit
7243aa7150
1 changed files with 1 additions and 0 deletions
|
@ -933,6 +933,7 @@ static int stm32h7_adc_prepare(struct stm32_adc *adc)
|
|||
|
||||
static void stm32h7_adc_unprepare(struct stm32_adc *adc)
|
||||
{
|
||||
stm32_adc_writel(adc, STM32H7_ADC_PCSEL, 0);
|
||||
stm32h7_adc_disable(adc);
|
||||
stm32h7_adc_enter_pwr_down(adc);
|
||||
}
|
||||
|
|
Loading…
Reference in a new issue