From patchwork Mon Jan 28 16:55:22 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: Quentin Perret X-Patchwork-Id: 10784053 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 756611390 for ; Mon, 28 Jan 2019 16:55:55 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 62A4C2B8B8 for ; Mon, 28 Jan 2019 16:55:55 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 5679F2B8C6; Mon, 28 Jan 2019 16:55:55 +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 E8D462B8B8 for ; Mon, 28 Jan 2019 16:55:54 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2388693AbfA1Qzw (ORCPT ); Mon, 28 Jan 2019 11:55:52 -0500 Received: from usa-sjc-mx-foss1.foss.arm.com ([217.140.101.70]:49950 "EHLO foss.arm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2388442AbfA1Qzv (ORCPT ); Mon, 28 Jan 2019 11:55:51 -0500 Received: from usa-sjc-imap-foss1.foss.arm.com (unknown [10.72.51.249]) by usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id D2381EBD; Mon, 28 Jan 2019 08:55:50 -0800 (PST) Received: from queper01-lin.cambridge.arm.com (queper01-lin.cambridge.arm.com [10.1.195.48]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id 300723F59C; Mon, 28 Jan 2019 08:55:48 -0800 (PST) From: Quentin Perret To: rjw@rjwysocki.net, viresh.kumar@linaro.org, sudeep.holla@arm.com, liviu.dudau@arm.com, lorenzo.pieralisi@arm.com, robh+dt@kernel.org, mark.rutland@arm.com, nm@ti.com, sboyd@kernel.org Cc: linux-arm-kernel@lists.infradead.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, linux-pm@vger.kernel.org, dietmar.eggemann@arm.com, mka@chromium.org, quentin.perret@arm.com Subject: [PATCH 7/7] arm: dts: vexpress-v2p-ca15_a7: Add cpu dynamic-power-coefficient information Date: Mon, 28 Jan 2019 16:55:22 +0000 Message-Id: <20190128165522.31749-8-quentin.perret@arm.com> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20190128165522.31749-1-quentin.perret@arm.com> References: <20190128165522.31749-1-quentin.perret@arm.com> MIME-Version: 1.0 Sender: linux-pm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-pm@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP From: Dietmar Eggemann A CPUfreq driver, like the ARM big.LITTLE driver used on the TC2 board, which provide the Energy Model with power cost information via the PM_OPP of_dev_pm_opp_get_cpu_power() function, do need the dynamic-power-coefficient (C) in the device tree. Method used to obtain the C value: C is computed by measuring energy (E) consumption of a frequency domain (FD) over a 10s runtime (t) sysbench workload running at each Operating Performance Point (OPP) affine to 1 or 2 CPUs of that FD while the other CPUs of the system are hotplugged out. By definition all CPUs of a FD have the the same micro-architecture. An OPP is characterized by a certain frequency (f) and voltage (V) value. The corresponding power values (P) are calculated by dividing the delta of the E values between the runs with 2 and 1 CPUs by t. With n data tuples (P, f, V), n equal to number of OPPs for this frequency domain, we can solve C by: P = Pstat + Pdyn P = Pstat + CV²f Cx = (Px - P1)/(Vx²fx - V1²f1) with x = {2, ..., n} The C value is the arithmetic mean out of {C2, ..., Cn}. Signed-off-by: Dietmar Eggemann Signed-off-by: Quentin Perret --- arch/arm/boot/dts/vexpress-v2p-ca15_a7.dts | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/arch/arm/boot/dts/vexpress-v2p-ca15_a7.dts b/arch/arm/boot/dts/vexpress-v2p-ca15_a7.dts index a2ccacd07f4f..00cd9f5bef2e 100644 --- a/arch/arm/boot/dts/vexpress-v2p-ca15_a7.dts +++ b/arch/arm/boot/dts/vexpress-v2p-ca15_a7.dts @@ -42,6 +42,7 @@ cci-control-port = <&cci_control1>; cpu-idle-states = <&CLUSTER_SLEEP_BIG>; capacity-dmips-mhz = <1024>; + dynamic-power-coefficient = <990>; }; cpu1: cpu@1 { @@ -51,6 +52,7 @@ cci-control-port = <&cci_control1>; cpu-idle-states = <&CLUSTER_SLEEP_BIG>; capacity-dmips-mhz = <1024>; + dynamic-power-coefficient = <990>; }; cpu2: cpu@2 { @@ -60,6 +62,7 @@ cci-control-port = <&cci_control2>; cpu-idle-states = <&CLUSTER_SLEEP_LITTLE>; capacity-dmips-mhz = <516>; + dynamic-power-coefficient = <133>; }; cpu3: cpu@3 { @@ -69,6 +72,7 @@ cci-control-port = <&cci_control2>; cpu-idle-states = <&CLUSTER_SLEEP_LITTLE>; capacity-dmips-mhz = <516>; + dynamic-power-coefficient = <133>; }; cpu4: cpu@4 { @@ -78,6 +82,7 @@ cci-control-port = <&cci_control2>; cpu-idle-states = <&CLUSTER_SLEEP_LITTLE>; capacity-dmips-mhz = <516>; + dynamic-power-coefficient = <133>; }; idle-states {