linux-kernel - Re: [PATCH] rtc: pm8xxx: clear alarm register when alarm is not enabled

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Date:   Sat, 21 Mar 2020 14:21:25 +0100
From:   Alexandre Belloni <alexandre.belloni@...tlin.com>
To:     韩科才 <hankecai@...o.com>
Cc:     a.zummo@...ertech.it, linux-rtc@...r.kernel.org,
        linux-kernel@...r.kernel.org, trivial@...nel.org, kernel@...o.com
Subject: Re: [PATCH] rtc: pm8xxx: clear alarm register when alarm is not
 enabled

Hi,

Isn't that the same as:
https://patchwork.ozlabs.org/patch/1257381/ ?

On 21/03/2020 19:50:17+0800, 韩科才 wrote:
> Clear alarm register when alarm is not enabled otherwise the consumer
> may still start alarm timer if it find the alarm register is not zero.
> 
> Signed-off-by: hankecai <hankecai@...o.com>
> ---
>  drivers/rtc/rtc-pm8xxx.c | 11 +++++++++++
>  1 file changed, 11 insertions(+)
> 
> diff --git a/drivers/rtc/rtc-pm8xxx.c b/drivers/rtc/rtc-pm8xxx.c
> index 07ea1be3abb9..3fa5416ad90d 100644
> --- a/drivers/rtc/rtc-pm8xxx.c
> +++ b/drivers/rtc/rtc-pm8xxx.c
> @@ -301,6 +301,7 @@ static int pm8xxx_rtc_alarm_irq_enable(struct device *dev, unsigned int enable)
>  	struct pm8xxx_rtc *rtc_dd = dev_get_drvdata(dev);
>  	const struct pm8xxx_rtc_regs *regs = rtc_dd->regs;
>  	unsigned int ctrl_reg;
> +	u8 value[NUM_8_BIT_RTC_REGS] = {0};
>  
>  	spin_lock_irqsave(&rtc_dd->ctrl_reg_lock, irq_flags);
>  
> @@ -319,6 +320,16 @@ static int pm8xxx_rtc_alarm_irq_enable(struct device *dev, unsigned int enable)
>  		goto rtc_rw_fail;
>  	}
>  
> +	/* Clear Alarm register */
> +	if (!enable) {
> +		rc = regmap_bulk_write(rtc_dd->regmap, regs->alarm_rw, value,
> +				sizeof(value));
> +		if (rc) {
> +			dev_err(dev, "Clear RTC ALARM register failed\n");
> +			goto rtc_rw_fail;
> +		}
> +	}
> +
>  rtc_rw_fail:
>  	spin_unlock_irqrestore(&rtc_dd->ctrl_reg_lock, irq_flags);
>  	return rc;
> -- 
> 2.21.0
> 
> 
> 

-- 
Alexandre Belloni, Bootlin
Embedded Linux and Kernel engineering
https://bootlin.com