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=-0.6 required=3.0 tests=DKIM_SIGNED, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_PASS,T_DKIM_INVALID, URIBL_BLOCKED autolearn=ham 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 28C93ECDFB0 for ; Fri, 13 Jul 2018 22:20:51 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id C4B4A20870 for ; Fri, 13 Jul 2018 22:20:50 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="key not found in DNS" (0-bit key) header.d=codeaurora.org header.i=@codeaurora.org header.b="ELe66GmC"; dkim=fail reason="key not found in DNS" (0-bit key) header.d=codeaurora.org header.i=@codeaurora.org header.b="ELe66GmC" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org C4B4A20870 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=codeaurora.org Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729773AbeGMWhU (ORCPT ); Fri, 13 Jul 2018 18:37:20 -0400 Received: from smtp.codeaurora.org ([198.145.29.96]:53488 "EHLO smtp.codeaurora.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725908AbeGMWhU (ORCPT ); Fri, 13 Jul 2018 18:37:20 -0400 Received: by smtp.codeaurora.org (Postfix, from userid 1000) id 8506260B72; Fri, 13 Jul 2018 22:20:45 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=codeaurora.org; s=default; t=1531520445; bh=klkLLKra+mFHbFEHbzQlscuQw4ncCY03czvUAEc9Bps=; h=Subject:To:Cc:References:From:Date:In-Reply-To:From; b=ELe66GmC9z7uhHie0WSxceJfEuPfqw9zEhLeHJUQTb+vTNLEjzN34vsOu3cKkBlbO 60qh5j6to6sYKCjZUNDIls7KA8BwKweaMLh0CoU0yL3qD5LwuYpCv+a+DOXAaWdoGf s0Q35LUzGSYO+B7rRjd3objUMh+hsMRupRZFBq4o= Received: from [10.226.58.143] (i-global254.qualcomm.com [199.106.103.254]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) (Authenticated sender: pprakash@smtp.codeaurora.org) by smtp.codeaurora.org (Postfix) with ESMTPSA id 8EA1560541; Fri, 13 Jul 2018 22:20:44 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=codeaurora.org; s=default; t=1531520445; bh=klkLLKra+mFHbFEHbzQlscuQw4ncCY03czvUAEc9Bps=; h=Subject:To:Cc:References:From:Date:In-Reply-To:From; b=ELe66GmC9z7uhHie0WSxceJfEuPfqw9zEhLeHJUQTb+vTNLEjzN34vsOu3cKkBlbO 60qh5j6to6sYKCjZUNDIls7KA8BwKweaMLh0CoU0yL3qD5LwuYpCv+a+DOXAaWdoGf s0Q35LUzGSYO+B7rRjd3objUMh+hsMRupRZFBq4o= DMARC-Filter: OpenDMARC Filter v1.3.2 smtp.codeaurora.org 8EA1560541 Authentication-Results: pdx-caf-mail.web.codeaurora.org; dmarc=none (p=none dis=none) header.from=codeaurora.org Authentication-Results: pdx-caf-mail.web.codeaurora.org; spf=none smtp.mailfrom=pprakash@codeaurora.org Subject: Re: [PATCH v4] cpufreq / CPPC: Add cpuinfo_cur_freq support for CPPC To: George Cherian , linux-kernel@vger.kernel.org, linux-pm@vger.kernel.org Cc: viresh.kumar@linaro.org, rjw@rjwysocki.net References: <1531375675-52623-1-git-send-email-george.cherian@cavium.com> From: "Prakash, Prashanth" Message-ID: <41a6e3c7-db85-9ff1-daf4-07569c11fc8c@codeaurora.org> Date: Fri, 13 Jul 2018 16:20:43 -0600 User-Agent: Mozilla/5.0 (Windows NT 10.0; WOW64; rv:52.0) Gecko/20100101 Thunderbird/52.9.1 MIME-Version: 1.0 In-Reply-To: <1531375675-52623-1-git-send-email-george.cherian@cavium.com> Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 7bit Content-Language: en-US Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hi George, This version looks good. Thanks! On 7/12/2018 12:07 AM, George Cherian wrote: > Per Section 8.4.7.1.3 of ACPI 6.2, The platform provides performance > feedback via set of performance counters. To determine the actual > performance level delivered over time, OSPM may read a set of > performance counters from the Reference Performance Counter Register > and the Delivered Performance Counter Register. > > OSPM calculates the delivered performance over a given time period by > taking a beginning and ending snapshot of both the reference and > delivered performance counters, and calculating: > > delivered_perf = reference_perf X (delta of delivered_perf counter / delta of reference_perf counter). > > Implement the above and hook this to the cpufreq->get method. > > Signed-off-by: George Cherian > Acked-by: Viresh Kumar Acked-by: Prashanth Prakash