On Mon, 18 Sep 2017 12:05:30 +0200
Fabrice Gasnier <fabrice.gasnier@xxxxxx> wrote:
> 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 <fabrice.gasnier@xxxxxx>
Applied to the fixes-togreg-post-rc1 branch of iio.git and marked
for stable.
Thanks,
Jonathan
> ---
> drivers/iio/trigger/stm32-timer-trigger.c | 3 ++-
> 1 file changed, 2 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/iio/trigger/stm32-timer-trigger.c b/drivers/iio/trigger/stm32-timer-trigger.c
> index 9b90534..34cc25b 100644
> --- a/drivers/iio/trigger/stm32-timer-trigger.c
> +++ b/drivers/iio/trigger/stm32-timer-trigger.c
> @@ -715,8 +715,9 @@ 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;
> }
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