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Message-ID: <20220620154738.801706-2-olivier.moysan@foss.st.com>
Date: Mon, 20 Jun 2022 17:47:37 +0200
From: Olivier Moysan <olivier.moysan@...s.st.com>
To: Alexandre Torgue <alexandre.torgue@...s.st.com>,
Fabrice Gasnier <fabrice.gasnier@...s.st.com>,
Jonathan Cameron <jic23@...nel.org>,
Lars-Peter Clausen <lars@...afoo.de>,
Maxime Coquelin <mcoquelin.stm32@...il.com>,
Olivier Moysan <olivier.moysan@...s.st.com>,
Paul Cercueil <paul@...pouillou.net>,
Wan Jiabing <wanjiabing@...o.com>
CC: <linux-arm-kernel@...ts.infradead.org>,
<linux-iio@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
<linux-stm32@...md-mailman.stormreply.com>
Subject: [PATCH 1/2] 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@...s.st.com>
---
drivers/iio/adc/stm32-adc.c | 3 +++
1 file changed, 3 insertions(+)
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,
--
2.25.1
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