From nobody Sat Sep 21 11:46:11 2024 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 8BC03C4332F for ; Wed, 5 Oct 2022 09:34:15 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229623AbiJEJeN (ORCPT ); Wed, 5 Oct 2022 05:34:13 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:42236 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229530AbiJEJeM (ORCPT ); Wed, 5 Oct 2022 05:34:12 -0400 Received: from madras.collabora.co.uk (madras.collabora.co.uk [46.235.227.172]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 561B61FCC8; Wed, 5 Oct 2022 02:34:11 -0700 (PDT) Received: from IcarusMOD.eternityproject.eu (2-237-20-237.ip236.fastwebnet.it [2.237.20.237]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (4096 bits) server-digest SHA256) (No client certificate requested) (Authenticated sender: kholk11) by madras.collabora.co.uk (Postfix) with ESMTPSA id 98BBD66022E4; Wed, 5 Oct 2022 10:34:08 +0100 (BST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=collabora.com; s=mail; t=1664962449; bh=pRg0SkW5d5gHVASYVoiFL+t/7J8p0XFnGA9gDu1F/Lg=; h=From:To:Cc:Subject:Date:From; b=WJEbR58ZP3OCHhAFbRm6aXrr7djjEr+MKGpCNj5rEbflgnRDXMTgxtzqyoQXTEXyL XKRXZx9b04xz9104Pa9sLLxBp3oSEjV9K8GzBglt/aLjU2+FGMGx9I5ZJiHf1IgkSN oteWdNodt8bW7wZjkX9UDFRrceYaf+faRkS57UB70fq6TmfrZSR4wgtCPQt/Hzf6hE ki4yp+4lU7doa58WMzS1TPp1ir+TzZATOmoyGU5QEIgUOrQuTIA00r/z9C9YU/G16b M5VdOnISiqaK4TLS4Bx8Pjx9Mf4yPPJTEF5C81V/c3IBjsuIBL4wsFYQqI+Wqwc609 oDEle3kRlmX+Q== From: AngeloGioacchino Del Regno To: robh+dt@kernel.org Cc: krzysztof.kozlowski+dt@linaro.org, matthias.bgg@gmail.com, tinghan.shen@mediatek.com, seiya.wang@mediatek.com, angelogioacchino.delregno@collabora.com, devicetree@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-mediatek@lists.infradead.org, linux-kernel@vger.kernel.org Subject: [PATCH] arm64: dts: mediatek: mt8195: Fix CPUs capacity-dmips-mhz Date: Wed, 5 Oct 2022 11:34:03 +0200 Message-Id: <20221005093404.33102-1-angelogioacchino.delregno@collabora.com> X-Mailer: git-send-email 2.37.2 MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Type: text/plain; charset="utf-8" The capacity-dmips-mhz parameter was miscalculated: this SoC runs the first (Cortex-A55) cluster at a maximum of 2000MHz and the second (Cortex-A78) cluster at a maximum of 3000MHz. In order to calculate the right capacity-dmips-mhz, the following test was performed: 1. CPUFREQ governor was set to 'performance' on both clusters 2. Ran dhrystone with 500000000 iterations for 10 times on each cluster 3. Calculate the mean result for each cluster 4. Calculate DMIPS/MHz: dmips_mhz =3D dmips_per_second / cpu_mhz 5. Scale results to 1024: result_c0 =3D (dmips_mhz_c0 - min_dmips_mhz(c0, c1)) / (max_dmips_mhz(c0, c1) - min_dmips_mhz(c0, c1)) * 1024 The mean results for this SoC are: Cluster 0 (LITTLE): 11990400 Dhry/s Cluster 1 (BIG): 59809036 Dhry/s The calculated scaled results are: Cluster 0: 307,934312801831 (rounded to 308) Cluster 1: 1024 Fixes: 37f2582883be ("arm64: dts: Add mediatek SoC mt8195 and evaluation bo= ard") Signed-off-by: AngeloGioacchino Del Regno --- arch/arm64/boot/dts/mediatek/mt8195.dtsi | 8 ++++---- 1 file changed, 4 insertions(+), 4 deletions(-) diff --git a/arch/arm64/boot/dts/mediatek/mt8195.dtsi b/arch/arm64/boot/dts= /mediatek/mt8195.dtsi index 905d1a90b406..0b85b5874a4f 100644 --- a/arch/arm64/boot/dts/mediatek/mt8195.dtsi +++ b/arch/arm64/boot/dts/mediatek/mt8195.dtsi @@ -36,7 +36,7 @@ cpu0: cpu@0 { enable-method =3D "psci"; performance-domains =3D <&performance 0>; clock-frequency =3D <1701000000>; - capacity-dmips-mhz =3D <578>; + capacity-dmips-mhz =3D <308>; cpu-idle-states =3D <&cpu_off_l &cluster_off_l>; next-level-cache =3D <&l2_0>; #cooling-cells =3D <2>; @@ -49,7 +49,7 @@ cpu1: cpu@100 { enable-method =3D "psci"; performance-domains =3D <&performance 0>; clock-frequency =3D <1701000000>; - capacity-dmips-mhz =3D <578>; + capacity-dmips-mhz =3D <308>; cpu-idle-states =3D <&cpu_off_l &cluster_off_l>; next-level-cache =3D <&l2_0>; #cooling-cells =3D <2>; @@ -62,7 +62,7 @@ cpu2: cpu@200 { enable-method =3D "psci"; performance-domains =3D <&performance 0>; clock-frequency =3D <1701000000>; - capacity-dmips-mhz =3D <578>; + capacity-dmips-mhz =3D <308>; cpu-idle-states =3D <&cpu_off_l &cluster_off_l>; next-level-cache =3D <&l2_0>; #cooling-cells =3D <2>; @@ -75,7 +75,7 @@ cpu3: cpu@300 { enable-method =3D "psci"; performance-domains =3D <&performance 0>; clock-frequency =3D <1701000000>; - capacity-dmips-mhz =3D <578>; + capacity-dmips-mhz =3D <308>; cpu-idle-states =3D <&cpu_off_l &cluster_off_l>; next-level-cache =3D <&l2_0>; #cooling-cells =3D <2>; --=20 2.37.2