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From: Len Brown <len.brown@intel.com>
To: Bruno Ducrot <ducrot@poupinou.org>
Cc: ACPI Developers <acpi-devel@lists.sourceforge.net>,
	cpufreq@www.linux.org.uk
Subject: Re: [ACPI] [PATCH] disable SMM access to SpeedStep using ACPI-FADT pstate_cnt
Date: 16 Feb 2004 00:46:37 -0500	[thread overview]
Message-ID: <1076910396.2507.41.camel@dhcppc4> (raw)
In-Reply-To: <20040215145407.GK13262@poupinou.org>

On Sun, 2004-02-15 at 09:54, Bruno Ducrot wrote:
> On Sun, Feb 15, 2004 at 11:57:12AM +0100, Dominik Brodowski wrote:
> > Disable SMM access to SpeedStep

> I would prefer to name it 'take_ownership' or something like that.  I think
> this is the correct naming.

We write PSTATE_CNT to SMI_CMD register to "assume processor p-state
control responsibility".  We're actually just telling SMM that the OS is
taking over p-states.  This might disable SMM involvement, or may just
change how SMM is involved -- we can't know which.  So I guess you're
right, and we end up with something like this:

- acpi_processor_disable_smm
+ acpi_processor_notify_smm

thanks,
-Len

  reply	other threads:[~2004-02-16  5:46 UTC|newest]

Thread overview: 5+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2004-02-15 10:57 [PATCH] disable SMM access to SpeedStep using ACPI-FADT pstate_cnt Dominik Brodowski
2004-02-15 14:54 ` [ACPI] " Bruno Ducrot
2004-02-16  5:46   ` Len Brown [this message]
2004-03-15 14:15     ` Dominik Brodowski
2004-02-16  5:29 ` Len Brown

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