From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-3.8 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS autolearn=no autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 02055C433FE for ; Wed, 15 Sep 2021 09:38:21 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id D24A661247 for ; Wed, 15 Sep 2021 09:38:20 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S237256AbhIOJji (ORCPT ); Wed, 15 Sep 2021 05:39:38 -0400 Received: from mga09.intel.com ([134.134.136.24]:58453 "EHLO mga09.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229785AbhIOJjg (ORCPT ); Wed, 15 Sep 2021 05:39:36 -0400 X-IronPort-AV: E=McAfee;i="6200,9189,10107"; a="222310760" X-IronPort-AV: E=Sophos;i="5.85,295,1624345200"; d="scan'208";a="222310760" Received: from fmsmga003.fm.intel.com ([10.253.24.29]) by orsmga102.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 15 Sep 2021 02:38:17 -0700 X-IronPort-AV: E=Sophos;i="5.85,295,1624345200"; d="scan'208";a="544766083" Received: from singanam-mobl1.gar.corp.intel.com ([10.213.67.66]) by fmsmga003-auth.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 15 Sep 2021 02:38:13 -0700 Message-ID: <48eef209ab34b7885790bf25fd93163f3eea4795.camel@linux.intel.com> Subject: Re: [PATCH v2] cpufreq: intel_pstate: Add Icelake servers support in no-HWP mode From: Srinivas Pandruvada To: Doug Smythies Cc: Giovanni Gherdovich , "Rafael J . Wysocki" , Viresh Kumar , Len Brown , Linux PM list , Linux Kernel Mailing List Date: Wed, 15 Sep 2021 02:38:10 -0700 In-Reply-To: References: <20210513132051.31465-1-ggherdovich@suse.cz> <067ee60e47a0350d01f0c3f216c1032818044b36.camel@suse.cz> <2a1b000cd101737400f6320ef18c0143d3a5145b.camel@linux.intel.com> <7abae13c235d74f4789cd93c6c6b0cbf69df243d.camel@linux.intel.com> Content-Type: text/plain; charset="UTF-8" User-Agent: Evolution 3.40.0-1 MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Tue, 2021-09-14 at 11:41 -0700, Doug Smythies wrote: > On Tue, Sep 7, 2021 at 8:43 PM Doug Smythies > wrote: > > [...] > > The intel_pstate driver works fine. > > Hi Srinivas, Hi Doug, > > I heard back from ASUS, and they now confirm that they > did change the behaviour of the "Auto" setting in BIOS > version 2103. They say they did it to fix an issue with > ITB3.0, which I assume means Intel Turbo Boost 3.0. > I'll copy and paste the relevant portion of the email > below: > > " I am in direct contact with the engineers. > Here is the result from their test: > > In BIOS 2103,the “Auto” setting transfers control to > the OS with HWP available and enabled. > > This is side effect to fix ITBM3.0 not work after HWP enabled. > We can remove this patch, but ITBM3.0 will not work when HWP enabled" > > Are you familiar with this issue? No. I think they mean that they need to expose ACPI CPPC information. It is possible they only expose ACPI CPPC information when HWP feature is available. But not sure why it requires HWP enable also. We (on Linux) depend on ACPI CPPC for turbo 3.0, but don't require HWP to be enabled by default. Thanks, Srinivas > > I want the original behaviour of the "Auto" setting, as it is > the only way for control to go to the OS with HWP > available but disabled. > > ... Doug