linux-kernel - Re: [PATCH] iio: trigger: stm32-timer: disable master mode when stopping

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Date:   Sat, 15 Feb 2020 18:41:35 +0000
From:   Jonathan Cameron <jic23@...nel.org>
To:     Fabrice Gasnier <fabrice.gasnier@...com>
Cc:     <linux-arm-kernel@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>, <mcoquelin.stm32@...il.com>,
        <benjamin.gaignard@...com>, <alexandre.torgue@...com>,
        <olivier.moysan@...com>, <linux-iio@...r.kernel.org>,
        <lars@...afoo.de>, <knaack.h@....de>, <pmeerw@...erw.net>,
        <linux-stm32@...md-mailman.stormreply.com>
Subject: Re: [PATCH] iio: trigger: stm32-timer: disable master mode when
 stopping

On Fri, 14 Feb 2020 17:46:35 +0100
Fabrice Gasnier <fabrice.gasnier@...com> wrote:

> Master mode should be disabled when stopping. This mainly impacts
> possible other use-case after timer has been stopped. Currently,
> master mode remains set (from start routine).
> 
> Fixes: 6fb34812c2a2 ("iio: stm32 trigger: Add support for TRGO2 triggers")
> 
> Signed-off-by: Fabrice Gasnier <fabrice.gasnier@...com>
I 'think' this is tangential to the other changes to this driver recently
and you seem to have prepared this against current mailine.

Hence applied to the fixes-togreg branch of iio.git and marked for stable.

Thanks,

Jonathan

> ---
>  drivers/iio/trigger/stm32-timer-trigger.c | 11 +++++++++--
>  1 file changed, 9 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/iio/trigger/stm32-timer-trigger.c b/drivers/iio/trigger/stm32-timer-trigger.c
> index 2e0d32a..2f82e8c 100644
> --- a/drivers/iio/trigger/stm32-timer-trigger.c
> +++ b/drivers/iio/trigger/stm32-timer-trigger.c
> @@ -161,7 +161,8 @@ static int stm32_timer_start(struct stm32_timer_trigger *priv,
>  	return 0;
>  }
>  
> -static void stm32_timer_stop(struct stm32_timer_trigger *priv)
> +static void stm32_timer_stop(struct stm32_timer_trigger *priv,
> +			     struct iio_trigger *trig)
>  {
>  	u32 ccer, cr1;
>  
> @@ -179,6 +180,12 @@ static void stm32_timer_stop(struct stm32_timer_trigger *priv)
>  	regmap_write(priv->regmap, TIM_PSC, 0);
>  	regmap_write(priv->regmap, TIM_ARR, 0);
>  
> +	/* Force disable master mode */
> +	if (stm32_timer_is_trgo2_name(trig->name))
> +		regmap_update_bits(priv->regmap, TIM_CR2, TIM_CR2_MMS2, 0);
> +	else
> +		regmap_update_bits(priv->regmap, TIM_CR2, TIM_CR2_MMS, 0);
> +
>  	/* Make sure that registers are updated */
>  	regmap_update_bits(priv->regmap, TIM_EGR, TIM_EGR_UG, TIM_EGR_UG);
>  }
> @@ -197,7 +204,7 @@ static ssize_t stm32_tt_store_frequency(struct device *dev,
>  		return ret;
>  
>  	if (freq == 0) {
> -		stm32_timer_stop(priv);
> +		stm32_timer_stop(priv, trig);
>  	} else {
>  		ret = stm32_timer_start(priv, trig, freq);
>  		if (ret)