linux-kernel - Re: [PATCH v9 0/7] ACPI / processor

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Message-ID: <5784D78E.7010409@arm.com>
Date:	Tue, 12 Jul 2016 12:42:06 +0100
From:	Sudeep Holla <sudeep.holla@....com>
To:	ACPI List <linux-acpi@...r.kernel.org>,
	"Rafael J . Wysocki" <rjw@...ysocki.net>
Cc:	Sudeep Holla <sudeep.holla@....com>,
	Vikas Sajjan <vikas.cha.sajjan@....com>,
	Sunil <sunil.vl@....com>,
	Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
	Prashanth Prakash <pprakash@...eaurora.org>,
	Al Stone <al.stone@...aro.org>,
	Ashwin Chaugule <ashwin.chaugule@...aro.org>,
	Daniel Lezcano <daniel.lezcano@...aro.org>,
	LKML <linux-kernel@...r.kernel.org>,
	ALKML <linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH v9 0/7] ACPI / processor_idle: Add ACPI v6.0 LPI support



On 08/07/16 18:07, Sudeep Holla wrote:
> ACPI 6.0 introduced LPI(Low Power Idle) states that provides an alternate
> method to describe processor idle states. It extends the specification
> to allow the expression of idle states like C-states selectable by the
> OSPM when a processor goes idle, but may affect more than one processor,
> and may affect other system components.
>
> LPI extensions leverages the processor container device(again introduced
> in ACPI 6.0) allowing to express which parts of the system are affected
> by a given LPI state. It defines the local power states for each node
> in a hierarchical processor topology. The OSPM can use _LPI object to
> select a local power state for each level of processor hierarchy in the
> system. They used to produce a composite power state request that is
> presented to the platform by the OSPM.
>
> Since multiple processors affect the idle state for any non-leaf hierarchy
> node, coordination of idle state requests between the processors is
> required. ACPI supports two different coordination schemes: Platform
> coordinated and  OS initiated.
>

I was hoping to get this in v4.8 now that merge window is
delayed/extended if you have no further comments on this series.

-- 
Regards,
Sudeep