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

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Date:	Tue, 24 Apr 2012 23:15:00 +0200
From:	"Rafael J. Wysocki" <rjw@...k.pl>
To:	Aaron Lu <aaron.lu@....com>
Cc:	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, 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 Tuesday, April 24, 2012, Aaron Lu wrote:
> 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.

I'd prefer to use ACPI_STATE_D3 wherever it makes sense, because that's
also well defined in older versions of ACPI (think pre-ACPI-4.0 BIOSes).

Thanks,
Rafael
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