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

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Message-ID: <20120424142457.GA5292@fedora>
Date:	Tue, 24 Apr 2012 22:24:57 +0800
From:	Aaron Lu <aaron.lu@....com>
To:	Lin Ming <ming.m.lin@...el.com>
Cc:	"Rafael J. Wysocki" <rjw@...k.pl>, Len Brown <lenb@...nel.org>,
	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 Tue, Apr 24, 2012 at 09:15:37PM +0800, Lin Ming wrote:
> >> > diff --git a/drivers/acpi/scan.c b/drivers/acpi/scan.c
> >> > index 7417267..734d946 100644
> >> > --- a/drivers/acpi/scan.c
> >> > +++ b/drivers/acpi/scan.c
> >> > @@ -908,6 +908,10 @@ static int acpi_bus_get_power_flags(struct acpi_device *device)
> >> >     device->power.states[ACPI_STATE_D3].flags.valid = 1;
> >> >     device->power.states[ACPI_STATE_D3].power = 0;
> >> >
> >> > +   /* Also set D3cold's explicit flag when _PS3 exists */
> >> > +   if (device->power.states[ACPI_STATE_D3_HOT].flags.explicit_set)
> >> > +           device->power.states[ACPI_STATE_D3].flags.explicit_set = 1;
> >>
> >> We should use ACPI_STATE_D3_COLD instead of ACPI_STATE_D3 to make thing
> >> clear.
> >>
> > Thanks for your suggestion.
> >
> > Well, considering all those ACPI_STATE_D3 used in tree, I don't think I
> > should use ACPI_STATE_D3_COLD here, especially the two lines above are
> > still using ACPI_STATE_D3.
> >
> > But if that is desired, we should probably change all the existing
> > ACPI_STATE_D3 macros to ACPI_STATE_D3_COLD to make things clear.
> >
> > Or we all use ACPI_STATE_D3, since it is defined as 4 and means D3 cold,
> > and people will learn this, won't they?
> >
> > What do you think?
> 
> OK.
> 
> But we may do more cleanup later.
> 

Sure :-)
I think the first thing to do is to agree on which macro should be used,
ACPI_STATE_D3 or ACPI_STATE_D3_COLD. And then replace the other one
altogether.

Thanks,
Aaron
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