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    Subject[PATCH 4.13 088/160] iio: trigger: stm32-timer: fix a corner case to write preset
    Date
    4.13-stable review patch.  If anyone has any objections, please let me know.

    ------------------

    From: Fabrice Gasnier <fabrice.gasnier@st.com>

    commit b7a9776c1f9443326632486fcbd82dca82f8511e upstream.

    Balance timer start routine that sets ARPE: clear it in stop routine.
    This fixes a corner case, when timer is used successively as trigger
    (with sampling_frequency start/stop routines), then as a counter
    (with preset).

    Fixes: 93fbe91b5521 ("iio: Add STM32 timer trigger driver")
    Signed-off-by: Fabrice Gasnier <fabrice.gasnier@st.com>
    Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
    Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

    ---
    drivers/iio/trigger/stm32-timer-trigger.c | 1 +
    1 file changed, 1 insertion(+)

    --- a/drivers/iio/trigger/stm32-timer-trigger.c
    +++ b/drivers/iio/trigger/stm32-timer-trigger.c
    @@ -138,6 +138,7 @@ static void stm32_timer_stop(struct stm3
    clk_disable(priv->clk);

    /* Stop timer */
    + regmap_update_bits(priv->regmap, TIM_CR1, TIM_CR1_ARPE, 0);
    regmap_update_bits(priv->regmap, TIM_CR1, TIM_CR1_CEN, 0);
    regmap_write(priv->regmap, TIM_PSC, 0);
    regmap_write(priv->regmap, TIM_ARR, 0);

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