From: Dominik Brodowski <linux@brodo.de>
To: "Grover, Andrew" <andrew.grover@intel.com>
Cc: David Moore <dcm@acm.org>,
"Adachi, Kenichi" <adachi@rd.scei.sony.co.jp>,
acpi-devel@lists.sourceforge.net, cpufreq@www.linux.org.uk
Subject: Re: [ACPI] _PDC method in DSDT
Date: Mon, 23 Jun 2003 15:38:34 +0200 [thread overview]
Message-ID: <20030623133834.GA2330@brodo.de> (raw)
In-Reply-To: <F760B14C9561B941B89469F59BA3A84725A303@orsmsx401.jf.intel.com>
On Mon, Jun 23, 2003 at 02:19:27AM -0700, Grover, Andrew wrote:
> The spec intended FixedFunctionalHW registers to be an "escape hatch".
> FFH means that while ACPI is used for perf state enumeration, the
> transitions will be handled in a CPU-specific driver, not via methods
> described in the ACPI spec. This division (use ACPI for enum, x for
> control) isn't currently supported by cpufreq; ACPI either does both
> enum and control, or neither.
But it could easily be added to the cpufreq drivers. For example, the
speedstep-centrino driver could call a
int acpi_get_frequency_table(struct cpufreq_frequency_table **freq_table)
which returns an array with the frequency in freq_table[i].frequency, and
some sort of "index" in freq_table[i].index, e.g. what needs to be written
into the IA32_PERF_CTL MSR.
Dominik
next prev parent reply other threads:[~2003-06-23 13:38 UTC|newest]
Thread overview: 22+ messages / expand[flat|nested] mbox.gz Atom feed top
2003-06-23 9:19 [ACPI] _PDC method in DSDT Grover, Andrew
2003-06-23 13:38 ` Dominik Brodowski [this message]
2003-06-23 16:11 ` Ducrot Bruno
2003-06-23 17:12 ` Jeremy Fitzhardinge
2003-06-23 20:02 ` David Moore
2003-06-23 21:37 ` Dominik Brodowski
2003-06-24 1:14 ` David Moore
2003-06-24 1:37 ` Jeremy Fitzhardinge
2003-06-24 2:02 ` David Moore
2003-06-24 2:16 ` Jeremy Fitzhardinge
2003-06-24 9:18 ` Ducrot Bruno
2003-06-24 21:47 ` David Moore
2003-06-26 10:40 ` Ducrot Bruno
2003-06-26 11:13 ` Ducrot Bruno
2003-09-04 23:19 ` [RFC] cpufreq: use new acpi processor perflib in speedstep-centrino [Was: Re: [ACPI] _PDC method in DSDT] Dominik Brodowski
2003-09-05 16:53 ` Jeremy Fitzhardinge
-- strict thread matches above, loose matches on Subject: below --
2003-06-23 7:11 [ACPI] _PDC method in DSDT Grover, Andrew
2003-06-23 7:53 ` David Moore
2003-06-23 12:27 ` Ducrot Bruno
2003-06-23 13:42 ` Dominik Brodowski
2003-06-23 7:59 ` Arjan van de Ven
2003-06-23 13:44 ` Dominik Brodowski
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