From: Fabrice Gasnier fabrice.gasnier@foss.st.com
[ Upstream commit fd5ac974fc25feed084c2d1599d0dddb4e0556bc ]
The ARR (auto reload register) and CMP (compare) registers are successively written. The status bits to check the update of these registers are polled together with regmap_read_poll_timeout(). The condition to end the loop may become true, even if one of the register isn't correctly updated. So ensure both status bits are set before clearing them.
Fixes: d8958824cf07 ("iio: counter: Add support for STM32 LPTimer") Signed-off-by: Fabrice Gasnier fabrice.gasnier@foss.st.com Link: https://lore.kernel.org/r/20221123133609.465614-1-fabrice.gasnier@foss.st.co... Signed-off-by: William Breathitt Gray william.gray@linaro.org Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/counter/stm32-lptimer-cnt.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/counter/stm32-lptimer-cnt.c b/drivers/counter/stm32-lptimer-cnt.c index bbc930a5962c..95f8f2e217db 100644 --- a/drivers/counter/stm32-lptimer-cnt.c +++ b/drivers/counter/stm32-lptimer-cnt.c @@ -69,7 +69,7 @@ static int stm32_lptim_set_enable_state(struct stm32_lptim_cnt *priv,
/* ensure CMP & ARR registers are properly written */ ret = regmap_read_poll_timeout(priv->regmap, STM32_LPTIM_ISR, val, - (val & STM32_LPTIM_CMPOK_ARROK), + (val & STM32_LPTIM_CMPOK_ARROK) == STM32_LPTIM_CMPOK_ARROK, 100, 1000); if (ret) return ret;