linux-kernel - Re: System automatically wakes up because of Intel Rapid Start Technology

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Date:	Mon, 22 Dec 2014 16:50:37 +0100
From:	Gabriele Mazzotta <gabriele.mzt@...il.com>
To:	Matthew Garrett <mjg59@...f.ucam.org>
Cc:	platform-driver-x86@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: System automatically wakes up because of Intel Rapid Start Technology

On Monday 22 December 2014 14:59:49 Matthew Garrett wrote:
> Can you try this diff?

Unfortunately it doesn't work (I made a change, see here below).

> diff --git a/drivers/rtc/rtc-cmos.c b/drivers/rtc/rtc-cmos.c
> index 5b2e761..637f980 100644
> --- a/drivers/rtc/rtc-cmos.c
> +++ b/drivers/rtc/rtc-cmos.c
> @@ -48,6 +48,7 @@ struct cmos_rtc {
>  	struct device		*dev;
>  	int			irq;
>  	struct resource		*iomem;
> +	struct rtc_wkalrm	alm;
>  
>  	void			(*wake_on)(struct device *);
>  	void			(*wake_off)(struct device *);
> @@ -59,6 +60,8 @@ struct cmos_rtc {
>  	u8			day_alrm;
>  	u8			mon_alrm;
>  	u8			century;
> +
> +	bool			valid_alarm;
>  };
>  
>  /* both platform and pnp busses use negative numbers for invalid irqs */
> @@ -879,6 +882,7 @@ static int cmos_suspend(struct device *dev)
>  
>  		cmos_checkintr(cmos, tmp);
>  	}
> +	cmos->valid_alarm = !!cmos_read_alarm(dev, &cmos->alm);

I moved this after spin_unlock_irq(), it causes a deadlock otherwise.

>  	spin_unlock_irq(&rtc_lock);
>  
>  	if (tmp & RTC_AIE) {
> @@ -949,6 +953,10 @@ static int cmos_resume(struct device *dev)
>  			hpet_mask_rtc_irq_bit(RTC_AIE);
>  		} while (mask & RTC_AIE);
>  	}
> +
> +	if (cmos->valid_alarm)
> +		cmos_set_alarm(dev, &cmos->alm);
> +
>  	spin_unlock_irq(&rtc_lock);
>  
>  	dev_dbg(dev, "resume, ctrl %02x\n", tmp);
> 
> 
> 

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