On Monday 22 December 2014 18:02:54 Matthew Garrett wrote:
> Getting this right is a little bit annoying - if the timer would have
> expired during the time we were suspended, we don't want to re-enable
> it. I *think* this covers all cases, and does it in generic code rather
> than special-casing it. Any chance you can give it a test?
I've done a quick test. has_persistent_clock() is false on my system,
so this patch has no effect as it is.
> diff --git a/drivers/rtc/class.c b/drivers/rtc/class.c
> index 472a5ad..4e3a2a1 100644
> --- a/drivers/rtc/class.c
> +++ b/drivers/rtc/class.c
> @@ -91,6 +91,8 @@ static int rtc_suspend(struct device *dev)
> old_system = timespec64_sub(old_system, delta_delta);
> }
>
> + rtc->valid_alarm = !rtc_read_alarm(rtc, &rtc->alarm);
> +
> return 0;
> }
>
> @@ -145,6 +147,29 @@ static int rtc_resume(struct device *dev)
> if (sleep_time.tv_sec >= 0)
> timekeeping_inject_sleeptime64(&sleep_time);
> rtc_hctosys_ret = 0;
> +
> + /*
> + * If there was an alarm set before suspend, make sure that the
> + * platform hasn't overwritten it
> + */
> + if (rtc->valid_alarm) {
> + struct rtc_time tm;
> + long now, scheduled;
> +
> + rtc_read_time(rtc, &tm);
> + rtc_tm_to_time(&rtc->alarm.time, &scheduled);
> + rtc_tm_to_time(&tm, &now);
> +
> + /* Clear the alarm if it went off during suspend */
> + if (scheduled <= now) {
> + rtc_time_to_tm(0, &rtc->alarm.time);
> + rtc->alarm.enabled = 0;
> + }
> +
> + if (rtc->ops && rtc->ops->set_alarm)
> + rtc->ops->set_alarm(rtc->dev.parent, &rtc->alarm);
> + }
> +
> return 0;
> }
>
> diff --git a/include/linux/rtc.h b/include/linux/rtc.h
> index 6d6be09..bc805ff 100644
> --- a/include/linux/rtc.h
> +++ b/include/linux/rtc.h
> @@ -133,6 +133,10 @@ struct rtc_device
> /* Some hardware can't support UIE mode */
> int uie_unsupported;
>
> +#ifdef CONFIG_PM_SLEEP
> + struct rtc_wkalrm alarm;
> + bool valid_alarm;
> +#endif
> #ifdef CONFIG_RTC_INTF_DEV_UIE_EMUL
> struct work_struct uie_task;
> struct timer_list uie_timer;
>
>
>
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