linux-kernel - Re: [PATCH] ACPI: evaluate

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Date:	Sun, 1 Apr 2012 22:41:25 +0800
From:	Aaron Lu <aaron.lu@....com>
To:	Lin Ming <ming.m.lin@...el.com>
CC:	Len Brown <lenb@...nel.org>, "Rafeal J. Wysocki" <rjw@...k.pl>,
	<linux-acpi@...r.kernel.org>, <linux-pm@...r.kernel.org>,
	<linux-kernel@...r.kernel.org>, Zhang Rui <rui.zhang@...el.com>,
	Andiry Xu <andiry.xu@....com>, Alex He <alex.he@....com>
Subject: Re: [PATCH] ACPI: evaluate _PS3 when entering D3 Cold

On Sun, Apr 01, 2012 at 02:28:57PM +0800, Lin Ming wrote:
> > 
> > There is no D3 hot support for this device(from the firmware's
> > perspective), either it is at D0(via _PS0), or it will be at D3 cold(via
> > _PS3).
> 
> But this is the generic code. We can't only consider some special
> device.
Agree.

The code change I've made only affects D3 cold path, existing code path
to set device power state to D0-D3hot is not affected.

And for D3 cold path, I don't think evaluating _PS3 should do any harm
to the device, isn't it the case?

> 
> Maybe we need some flag to tell which D3 state _PS3 is used for.
Do you mean the ACPI spec needs to be updated to reflect which D3
state the device will be at once its _PS3 is evaluated?

-Aaron

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