From patchwork Fri Mar 22 22:45:20 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: srinivas pandruvada X-Patchwork-Id: 10866603 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id CA0C514DE for ; Fri, 22 Mar 2019 22:45:51 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id B3F7D2A9F9 for ; Fri, 22 Mar 2019 22:45:51 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id A7C492AA01; Fri, 22 Mar 2019 22:45:51 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-7.9 required=2.0 tests=BAYES_00,MAILING_LIST_MULTI, RCVD_IN_DNSWL_HI autolearn=ham version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 5C3AA2A9F9 for ; Fri, 22 Mar 2019 22:45:51 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728478AbfCVWpl (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: linux-acpi-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-acpi@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP 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; }