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

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Message-Id: <201204010929.21234.rjw@sisk.pl>
Date:	Sun, 1 Apr 2012 09:29:20 +0200
From:	"Rafael J. Wysocki" <rjw@...k.pl>
To:	Zhang Rui <rui.zhang@...el.com>
Cc:	Aaron Lu <aaron.lu@....com>, Lin Ming <ming.m.lin@...el.com>,
	Len Brown <lenb@...nel.org>, linux-acpi@...r.kernel.org,
	linux-pm@...r.kernel.org, linux-kernel@...r.kernel.org,
	Andiry Xu <andiry.xu@....com>, Alex He <alex.he@....com>
Subject: Re: [PATCH] ACPI: evaluate _PS3 when entering D3 Cold

On Sunday, April 01, 2012, Zhang Rui wrote:
[...]
> 
> How about this?
> 
> We should use the term "D3" in general in Linux.

I don't see why.  We can refer to the "old D3" as D3_cold.

> Without _PR3, OS should *assume* that the power is removed, although it
> may be not true.

That's correct.

> With _PR3, OS can *assure* that the power is removed, because it knows
> how to remove thw power (evaluating _PR3._OFF).

I'd rather say that with _PR3 we have the opportunity to avoid removing
power completely from the device.  In other words, D3_hot is supported (and
it is supported _only_ in that case).

> So the difference is that OS need to make sure whether to evaluate
> _PR3._OFF when _PR3 exists. For example, a device has _PR3, but _S0W
> returns 3, OS should not evaluate _PR3._OFF when the device sleeps with
> remote wakeup support.

That's correct.

> what do you think?

Well, see above and my other message in this thread.

Thanks,
Rafael
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