From: Fabrice Gasnier Date: Mon, 18 Sep 2017 10:05:30 +0000 (+0200) Subject: iio: trigger: stm32-timer: preset shouldn't be buffered X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=0a56eabc4e3f730782e4a9f3af4f60aa03a8a849;p=GitHub%2FLineageOS%2Fandroid_kernel_motorola_exynos9610.git iio: trigger: stm32-timer: preset shouldn't be buffered Currently, setting preset value (ARR) will update directly 'Auto reload value' only on 1st write access. But then, ARPE is set. This makes ARR a shadow register. Preset value should be updated upon each write request: ensure ARPE is 0. This fixes successive writes to preset attribute. Fixes: 4adec7da0536 ("iio: stm32 trigger: Add quadrature encoder device") Signed-off-by: Fabrice Gasnier Cc: Signed-off-by: Jonathan Cameron --- diff --git a/drivers/iio/trigger/stm32-timer-trigger.c b/drivers/iio/trigger/stm32-timer-trigger.c index a9bc5b603b86..4cec28af3ecf 100644 --- a/drivers/iio/trigger/stm32-timer-trigger.c +++ b/drivers/iio/trigger/stm32-timer-trigger.c @@ -681,8 +681,9 @@ static ssize_t stm32_count_set_preset(struct iio_dev *indio_dev, if (ret) return ret; + /* TIMx_ARR register shouldn't be buffered (ARPE=0) */ + regmap_update_bits(priv->regmap, TIM_CR1, TIM_CR1_ARPE, 0); regmap_write(priv->regmap, TIM_ARR, preset); - regmap_update_bits(priv->regmap, TIM_CR1, TIM_CR1_ARPE, TIM_CR1_ARPE); return len; }