The patch titled
rtc: disable hpet emulation on suspend
has been added to the -mm tree. Its filename is
rtc-disable-hpet-emulation-on-suspend.patch
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Subject: rtc: disable hpet emulation on suspend
From: Maxim Levitsky <maximlevitsky@xxxxxxxxx>
I noticed that rtc wont generate interrupts after a resume from disk.
Here hpet rtc emulation is used.
Problem is that rtc hpet comparator, isn't reinitialized after resume.
Easiest way to solve this, is always mask all hpet interrupts on suspend
This is triggered, when suspending with alarm set.
Otherwise, hpet driver will think it doesn't need to reinitialize
the rtc comparator, thus rtc interrupts won't work.
This emulation isn't need for wakealarm.
Signed-off-by: Maxim Levitsky <maximlevitsky@xxxxxxxxx>
Cc: David Brownell <david-b@xxxxxxxxxxx>
Cc: "H. Peter Anvin" <hpa@xxxxxxxxx>
Cc: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Cc: Ingo Molnar <mingo@xxxxxxx>
Cc: "Rafael J. Wysocki" <rjw@xxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
diff -puN drivers/rtc/rtc-cmos.c~rtc-disable-hpet-emulation-on-suspend drivers/rtc/rtc-cmos.c
--- a/drivers/rtc/rtc-cmos.c~rtc-disable-hpet-emulation-on-suspend
+++ a/drivers/rtc/rtc-cmos.c
@@ -871,8 +871,9 @@ static int cmos_suspend(struct device *d
mask = RTC_IRQMASK;
tmp &= ~mask;
CMOS_WRITE(tmp, RTC_CONTROL);
- hpet_mask_rtc_irq_bit(mask);
+ /* shut down hpet emulation - we don't need it for alarm */
+ hpet_mask_rtc_irq_bit(RTC_PIE|RTC_AIE|RTC_UIE);
cmos_checkintr(cmos, tmp);
}
spin_unlock_irq(&rtc_lock);
_
Patches currently in -mm which might be from maximlevitsky@xxxxxxxxx are
rtc-disable-hpet-emulation-on-suspend.patch
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