linux-kernel - Re: [PATCH v4 05/18] ARM64 / ACPI: Introduce sleep-arm.c

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Message-ID: <20140912200355.GD9234@xora-haswell.xora.org.uk>
Date:	Fri, 12 Sep 2014 21:03:55 +0100
From:	Graeme Gregory <gg@...mlogic.co.uk>
To:	Jon Masters <jcm@...hat.com>
Cc:	Hanjun Guo <hanjun.guo@...aro.org>,
	Catalin Marinas <catalin.marinas@....com>,
	"Rafael J. Wysocki" <rjw@...ysocki.net>,
	Mark Rutland <mark.rutland@....com>,
	Olof Johansson <olof@...om.net>,
	Grant Likely <grant.likely@...aro.org>,
	Will Deacon <will.deacon@....com>,
	Rob Herring <robh@...nel.org>,
	Lorenzo Pieralisi <Lorenzo.Pieralisi@....com>,
	Robert Richter <rric@...nel.org>,
	Jason Cooper <jason@...edaemon.net>,
	Arnd Bergmann <arnd@...db.de>, linaro-acpi@...ts.linaro.org,
	Marc Zyngier <marc.zyngier@....com>,
	Daniel Lezcano <daniel.lezcano@...aro.org>,
	Liviu Dudau <Liviu.Dudau@....com>,
	Robert Moore <robert.moore@...el.com>,
	Tomasz Nowicki <tomasz.nowicki@...aro.org>,
	linux-kernel@...r.kernel.org, linux-acpi@...r.kernel.org,
	Mark Brown <broonie@...nel.org>,
	Randy Dunlap <rdunlap@...radead.org>,
	Lv Zheng <lv.zheng@...el.com>,
	Sudeep Holla <Sudeep.Holla@....com>,
	Bjorn Helgaas <bhelgaas@...gle.com>,
	Graeme Gregory <graeme.gregory@...aro.org>,
	linux-arm-kernel@...ts.infradead.org, Charles.Garcia-Tobin@....com
Subject: Re: [PATCH v4 05/18] ARM64 / ACPI: Introduce sleep-arm.c

On Fri, Sep 12, 2014 at 03:43:36PM -0400, Jon Masters wrote:
> On 09/12/2014 10:00 AM, Hanjun Guo wrote:
> > From: Graeme Gregory <graeme.gregory@...aro.org>
> > 
> > ACPI 5.1 does not currently support S states for ARM64 hardware but
> > ACPI code will call acpi_target_system_state() for device power
> > managment, so introduce sleep-arm.c to allow other drivers to function
> > until S states are defined.
> 
> Aside: ACPI5.1 does define the Platform Communication Channel and CPC
> (Collaborative Processor Performance Control). Some details need to be
> fleshed out there for practical 64-bit ARMv8 server systems, but the
> underpinnings and mechanisms are in place in the 5.1 specification that
> can be built upon over time to achieve practical S-State equivalence.
> 
Disagree, S-States are about going to sleep or hibernating, that is
nothing to do with CPU Performance.

Graeme

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