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

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Message-ID: <576013AD.4040400@arm.com>
Date:	Tue, 14 Jun 2016 15:24:45 +0100
From:	Sudeep Holla <sudeep.holla@....com>
To:	"Rafael J. Wysocki" <rjw@...ysocki.net>
Cc:	Sudeep Holla <sudeep.holla@....com>, linux-acpi@...r.kernel.org,
	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



On 13/06/16 22:05, Rafael J. Wysocki wrote:
> On Friday, June 10, 2016 06:38:01 PM Sudeep Holla wrote:
>> Hi Rafael,
>
> Hi,
>
>> 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.
>
> I'd really preferred it if you posted the next version without waiting for
> my feedback to the previous one (as the feedback may not be relevant any
> more among other things).
>

Sure, will do that soon.

-- 
Regards,
Sudeep