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=-9.0 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_PASS,URIBL_BLOCKED, USER_AGENT_GIT autolearn=unavailable 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 C2FB7C43381 for ; Fri, 22 Mar 2019 22:45:52 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 981672075E for ; Fri, 22 Mar 2019 22:45:52 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728482AbfCVWpl (ORCPT ); Fri, 22 Mar 2019 18:45:41 -0400 Received: from mga18.intel.com ([134.134.136.126]:15693 "EHLO mga18.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728436AbfCVWp3 (ORCPT ); Fri, 22 Mar 2019 18:45:29 -0400 X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from orsmga005.jf.intel.com ([10.7.209.41]) by orsmga106.jf.intel.com with ESMTP/TLS/DHE-RSA-AES256-GCM-SHA384; 22 Mar 2019 15:45:29 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.60,256,1549958400"; d="scan'208";a="309622834" Received: from spandruv-mobl.amr.corp.intel.com ([10.254.53.177]) by orsmga005.jf.intel.com with ESMTP; 22 Mar 2019 15:45:28 -0700 From: Srinivas Pandruvada To: rjw@rjwysocki.net, lenb@kernel.org, viresh.kumar@linaro.org Cc: linux-acpi@vger.kernel.org, linux-kernel@vger.kernel.org, linux-pm@vger.kernel.org, pprakash@codeaurora.org, wangxiongfeng2@huawei.com, Srinivas Pandruvada , "4 . 20+" Subject: [PATCH 2/2] cpufreq: intel_pstate: Also use cppc nominal_perf for base_frequency Date: Fri, 22 Mar 2019 15:45:20 -0700 Message-Id: <20190322224520.6740-3-srinivas.pandruvada@linux.intel.com> X-Mailer: git-send-email 2.17.2 In-Reply-To: <20190322224520.6740-1-srinivas.pandruvada@linux.intel.com> References: <20190322224520.6740-1-srinivas.pandruvada@linux.intel.com> Sender: stable-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org ACPI specifications stat that if the "Guaranteed Performance Register" is not implemented, OSPM assumes guaranteed performance is always equal to nominal performance. So for invalid and unimplemented guaranteed performance register, use nominal performance as guaranteed performance. This change will fallback to nominal_perf when guranteed_perf is invalid. If nominal_perf is also invalid, then fallback to existing implementation, which is to read from HWP Capabilities MSR. Fixes: 86d333a8cc7f ("cpufreq: intel_pstate: Add base_frequency attribute") Signed-off-by: Srinivas Pandruvada Cc: 4.20+ # 4.20+ --- drivers/cpufreq/intel_pstate.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/drivers/cpufreq/intel_pstate.c b/drivers/cpufreq/intel_pstate.c index 7b4b0a7ac68b..e16dea241c55 100644 --- a/drivers/cpufreq/intel_pstate.c +++ b/drivers/cpufreq/intel_pstate.c @@ -385,6 +385,9 @@ static int intel_pstate_get_cppc_guranteed(int cpu) if (ret) return ret; + if (!cppc_perf.guaranteed_perf) + return cppc_perf.nominal_perf; + return cppc_perf.guaranteed_perf; } -- 2.17.2