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Date: Tue, 6 Sep 2011 10:34:32 +0800 From: Shawn Guo <shawn.guo@...escale.com> To: Santosh Shilimkar <santosh.shilimkar@...com> CC: <linux-arm-kernel@...ts.infradead.org>, <khilman@...com>, <linux@....linux.org.uk>, <linux-kernel@...r.kernel.org>, <rjw@...k.pl>, <ccross@...roid.com> Subject: Re: [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@...aro.org> -- Regards, Shawn -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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