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Subject: Re: [PATCH v9 0/7] ACPI / processor_idle: Add ACPI v6.0 LPI support
To: "Rafael J. Wysocki" <rjw@rjwysocki.net>
References: <1467997678-7107-1-git-send-email-sudeep.holla@arm.com>
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Cc: Sudeep Holla <sudeep.holla@arm.com>,
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        Vikas Sajjan <vikas.cha.sajjan@hpe.com>, Sunil <sunil.vl@hpe.com>,
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From: Sudeep Holla <sudeep.holla@arm.com>
Organization: ARM
Message-ID: <5784E9AB.1070507@arm.com>
Date: Tue, 12 Jul 2016 13:59:23 +0100
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On 12/07/16 13:09, Rafael J. Wysocki wrote:
> On Tuesday, July 12, 2016 12:42:06 PM Sudeep Holla wrote:
>>
>> 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.
>
> I'll get to it in the next couple of days.  If it looks all good and there are
> no comments, I'll queue it up.
>

Thanks for the update.

-- 
Regards,
Sudeep