linux-kernel - Re: [PATCH v5 2/5] ACPI / processor_idle: Add support for Low Power Idle(LPI) states

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Date:	Fri, 10 Jun 2016 18:38:01 +0100
From:	Sudeep Holla <sudeep.holla@....com>
To:	linux-acpi@...r.kernel.org, "Rafael J. Wysocki" <rjw@...ysocki.net>
Cc:	Sudeep Holla <sudeep.holla@....com>, linux-kernel@...r.kernel.org,
	Vikas Sajjan <vikas.cha.sajjan@....com>,
	Sunil <sunil.vl@....com>,
	Prashanth Prakash <pprakash@...eaurora.org>,
	Ashwin Chaugule <ashwin.chaugule@...aro.org>,
	Al Stone <al.stone@...aro.org>,
	Lorenzo Pieralisi <lorenzo.pieralisi@....com>
Subject: Re: [PATCH v5 2/5] ACPI / processor_idle: Add support for Low Power
 Idle(LPI) states

Hi Rafael,

On 11/05/16 16:37, Sudeep Holla wrote:
> ACPI 6.0 introduced an optional object _LPI that provides an alternate
> method to describe Low Power Idle states. 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.
>
> This patch adds initial support for Platform coordination scheme of LPI.
>

I have added support for autopromote states(basically skip flattening or
creating composite state). I have also fixed the bug discussed in this
thread with Prashant. Do you have any other feedback on this version
that I incorporate before posting next version.

-- 
Regards,
Sudeep