linux-kernel - Re: [RFC 0/3] Experimental patchset for CPPC

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Message-ID: <CAJ5Y-ebhE4-9WpB9Z+PO80qZJ2G4+UeK9Q3gk00XL=oO89esbA@mail.gmail.com>
Date:	Mon, 18 Aug 2014 11:04:53 -0400
From:	Ashwin Chaugule <ashwin.chaugule@...aro.org>
To:	Len Brown <lenb@...nel.org>
Cc:	Arjan van de Ven <arjan@...ux.intel.com>,
	Peter Zijlstra <peterz@...radead.org>,
	lkml <linux-kernel@...r.kernel.org>,
	Catalin Marinas <catalin.marinas@....com>,
	Mike Turquette <mike.turquette@...aro.org>,
	Morten Rasmussen <morten.rasmussen@....com>,
	Ingo Molnar <mingo@...nel.org>,
	"Brown, Len" <len.brown@...el.com>,
	"Rafael J. Wysocki" <rjw@...ysocki.net>,
	"linaro-acpi@...ts.linaro.org" <linaro-acpi@...ts.linaro.org>,
	Arnd Bergmann <arnd@...db.de>,
	linux acpi <linux-acpi@...r.kernel.org>,
	cpufreq@...r.kernel.org, Patch Tracking <patches@...aro.org>,
	Dirk Brandewie <dirk.brandewie@...il.com>
Subject: Re: [RFC 0/3] Experimental patchset for CPPC

Hi Len,

On 15 August 2014 18:11, Len Brown <lenb@...nel.org> wrote:
> The Linux team at Intel did not implement ACPI CPPC support
> because we see no benefit to it over the native hardware interface on x86.
>

Thanks for sharing Intels observations. I had looked at the SDM [1]
and found all the CPPC MSRs. I suppose X86 will not use a majority of
it.

Cheers,
Ashwin

[1] - HWP section 14.4
http://www.intel.com/content/dam/www/public/us/en/documents/manuals/64-ia-32-architectures-software-developer-vol-3b-part-2-manual.pdf
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