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    SubjectRe: [PATCH v2 0/5] CPU PM notifiers
    On Sat, Sep 03, 2011 at 08:09:10PM +0530, Santosh Shilimkar wrote:
    > Updates V2:
    > - The CPU PM notifiers are moved to generic level instead of keeping
    > it ARM specific as per Rafael's comment.
    > - To avoid every driver duplicating the sys-core ops and cpu pm notfiers,
    > the CPU PM common notifier is registering it in one place so that
    > suspend is taken care.
    > - CPU COMPLEX events are renamed to more appropriate CPU CLUSTER.
    > - GIC distributor is not disabled to avoid the live locks. This is
    > observed with CPUIDLE cases where at time CPU cluster fails to
    > transition to low power states. As such there was no need to
    > disable distributor in first place since on cluster reset, it
    > will get disabled anyways.
    > - In VFP code, syscore ops are dropped in favour of CPU PM
    > notifiers since S2R is already handled in core CPU PM notifiers.
    > - The last patch is an independent patch but can be pushed along with
    > the other GIC changes done here.
    >
    > V1: [http://lwn.net/Articles/447259/]
    >
    > This patch set tries to address concerns with platform pm code
    > calling into the driver for every block in the Cortex A9s
    > during idle, hotplug, and suspend. The first patch adds cpu pm
    > notifiers that can be called by platform code, the second uses
    > the notifier to save and restore the GIC state, and the third
    > saves the VFP state.
    >
    > The notifiers are used for two types of events, CPU PM events and
    > CPU cluster PM events. CPU PM events are used to save and restore
    > per-cpu context when a single CPU is preparing to enter or has
    > just exited a low power state. For example, the VFP saves the
    > last thread context, and the GIC saves banked CPU registers.
    >
    > CPU cluster events are used after all the CPUs in a power domain
    > have been prepared for the low power state. The GIC uses these
    > events to save global register state.
    >
    > L2 cache is not covered by this patch set, as the determination
    > of when the L2 is reset and when it is retained is
    > platform-specific, and most of the APIs necessary are already
    >
    >
    > The series is tested with OMAP4 with S2R and CPUIDLE.
    >
    > The following changes since commit c6a389f123b9f68d605bb7e0f9b32ec1e3e14132:
    >
    > Linux 3.1-rc4 (2011-08-28 21:16:01 -0700)
    >
    > Colin Cross (5):
    > cpu_pm: Add cpu power management notifiers
    > cpu_pm: call notifiers during suspend
    > ARM: gic: Use cpu pm notifiers to save gic state
    > ARM: vfp: Use cpu pm notifiers to save vfp state
    > ARM: gic: Allow gic arch extensions to provide irqchip flags
    >
    Really appreciate the patches. Now platform code needs to do nothing
    to have GIC back to work across suspend/resume cycle.

    On i.MX6Q:

    Tested-and-Acked-by: Shawn Guo <shawn.guo@linaro.org>

    --
    Regards,
    Shawn



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