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authorLinus Torvalds <torvalds@linux-foundation.org>2015-02-17 14:17:51 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2015-02-17 14:17:51 -0800
commit99fa0ad92c4fd8b529c89b3640b42323984be761 (patch)
treeba4ef84ab54c2c5636521c1b1ae4e9056d46c75c /drivers/isdn/hisax
parent1d9e71404e2c3f37387991534983dcb2ab05660d (diff)
parent5f5081852038d9a7b309190730bfb724b413235e (diff)
downloadlinux-99fa0ad92c4fd8b529c89b3640b42323984be761.tar.bz2
Merge tag 'suspend-to-idle-3.20-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm
Pull suspend-to-idle updates from Rafael Wysocki: "Suspend-to-idle timer quiescing support for v3.20-rc1 Until now suspend-to-idle has not been able to save much more energy than runtime PM because of timer interrupts that periodically bring CPUs out of idle while they are waiting for a wakeup interrupt. Of course, the timer interrupts are not wakeup ones, so the handling of them can be deferred until a real wakeup interrupt happens, but at the same time we don't want to mass-expire timers at that point. The solution is to suspend the entire timekeeping when the last CPU is entering an idle state and resume it when the first CPU goes out of idle. That has to be done with care, though, so as to avoid accessing suspended clocksources etc. end we need extra support from idle drivers for that. This series of commits adds support for quiescing timers during suspend-to-idle and adds the requisite callbacks to intel_idle and the ACPI cpuidle driver" * tag 'suspend-to-idle-3.20-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm: ACPI / idle: Implement ->enter_freeze callback routine intel_idle: Add ->enter_freeze callbacks PM / sleep: Make it possible to quiesce timers during suspend-to-idle timekeeping: Make it safe to use the fast timekeeper while suspended timekeeping: Pass readout base to update_fast_timekeeper() PM / sleep: Re-implement suspend-to-idle handling
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