This is a note to let you know that I've just added the patch titled
iio: adc: stm32: fix a current leak by resetting pcsel before disabling vdda
to the 5.4-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
iio-adc-stm32-fix-a-current-leak-by-resetting-pcsel-before-disabling-vdda.patch
and it can be found in the queue-5.4 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From f711f28e71e965c0d1141c830fa7131b41abbe75 Mon Sep 17 00:00:00 2001
From: Fabrice Gasnier <fabrice.gasnier@xxxxxxxxxxx>
Date: Fri, 22 Oct 2021 14:19:29 +0200
Subject: iio: adc: stm32: fix a current leak by resetting pcsel before disabling vdda
From: Fabrice Gasnier <fabrice.gasnier@xxxxxxxxxxx>
commit f711f28e71e965c0d1141c830fa7131b41abbe75 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: 95e339b6e85d ("iio: adc: stm32: add support for STM32H7")
Signed-off-by: Fabrice Gasnier <fabrice.gasnier@xxxxxxxxxxx>
Reviewed-by: Olivier Moysan <olivier.moysan@xxxxxxxxxxx>
Link: https://lore.kernel.org/r/1634905169-23762-1-git-send-email-fabrice.gasnier@xxxxxxxxxxx
Cc: <Stable@xxxxxxxxxxxxxxx>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/iio/adc/stm32-adc.c | 1 +
1 file changed, 1 insertion(+)
--- a/drivers/iio/adc/stm32-adc.c
+++ b/drivers/iio/adc/stm32-adc.c
@@ -933,6 +933,7 @@ pwr_dwn:
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);
}
Patches currently in stable-queue which might be from fabrice.gasnier@xxxxxxxxxxx are
queue-5.4/iio-adc-stm32-fix-a-current-leak-by-resetting-pcsel-before-disabling-vdda.patch
