linux-kernel - Re: [PATCH] counter: stm32-lptimer-cnt: fix the check on arr and cmp registers update

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Message-ID: <Y4KK5tck2aCdKWXF@ishi>
Date:   Sat, 26 Nov 2022 16:53:42 -0500
From:   William Breathitt Gray <wbg@...nel.org>
To:     Fabrice Gasnier <fabrice.gasnier@...s.st.com>
Cc:     william.gray@...aro.org, jic23@...nel.org,
        alexandre.torgue@...s.st.com, olivier.moysan@...s.st.com,
        linux-iio@...r.kernel.org,
        linux-stm32@...md-mailman.stormreply.com,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] counter: stm32-lptimer-cnt: fix the check on arr and cmp
 registers update

On Wed, Nov 23, 2022 at 02:36:09PM +0100, Fabrice Gasnier wrote:
> 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@...s.st.com>

Applied to the counter-current branch of counter.git.

William Breathitt Gray

> ---
>  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 d6b80b6dfc28..8439755559b2 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;
> -- 
> 2.25.1
> 

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