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 Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id E3B0DC4167B for ; Wed, 28 Dec 2022 15:06:43 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S233564AbiL1PGm (ORCPT ); Wed, 28 Dec 2022 10:06:42 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:54442 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S233570AbiL1PGl (ORCPT ); Wed, 28 Dec 2022 10:06:41 -0500 Received: from ams.source.kernel.org (ams.source.kernel.org [IPv6:2604:1380:4601:e00::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id E1FBE12750 for ; Wed, 28 Dec 2022 07:06:39 -0800 (PST) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ams.source.kernel.org (Postfix) with ESMTPS id 3113CB81729 for ; Wed, 28 Dec 2022 15:06:38 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id A64C1C433D2; Wed, 28 Dec 2022 15:06:36 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1672239997; bh=Q8Zd8I+IfY4VtHDMeRmgfaFo1o+CwB8+C1bUV/CcvLU=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=IeYX1unTP9onN9XFJjGsIqZtGAiQfe6TnVM2AX+N0vDBPygGOiL7Yse89N0cdClQs Dr+7NLlJZ0S1kGYBgRo/FW7uq7Ym+ZLuVDGcrRrlHWLew5B8IC2qln8P/BV9H2q6wm 51oe6Jg4dI6+N5Ygjm68t0nllGXf3Zt02kExoWQY= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, AngeloGioacchino Del Regno , Matthias Brugger , Sasha Levin Subject: [PATCH 6.1 0069/1146] arm64: dts: mediatek: mt8195: Fix CPUs capacity-dmips-mhz Date: Wed, 28 Dec 2022 15:26:48 +0100 Message-Id: <20221228144332.031209433@linuxfoundation.org> X-Mailer: git-send-email 2.39.0 In-Reply-To: <20221228144330.180012208@linuxfoundation.org> References: <20221228144330.180012208@linuxfoundation.org> User-Agent: quilt/0.67 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org From: AngeloGioacchino Del Regno [ Upstream commit 513c43328b189874fdfee3ae99cac81e5502e7f7 ] 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 = dmips_per_second / cpu_mhz 5. Scale results to 1024: result_c0 = (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 board") Signed-off-by: AngeloGioacchino Del Regno Link: https://lore.kernel.org/r/20221005093404.33102-1-angelogioacchino.delregno@collabora.com Signed-off-by: Matthias Brugger Signed-off-by: Sasha Levin --- 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 = "psci"; performance-domains = <&performance 0>; clock-frequency = <1701000000>; - capacity-dmips-mhz = <578>; + capacity-dmips-mhz = <308>; cpu-idle-states = <&cpu_off_l &cluster_off_l>; next-level-cache = <&l2_0>; #cooling-cells = <2>; @@ -49,7 +49,7 @@ cpu1: cpu@100 { enable-method = "psci"; performance-domains = <&performance 0>; clock-frequency = <1701000000>; - capacity-dmips-mhz = <578>; + capacity-dmips-mhz = <308>; cpu-idle-states = <&cpu_off_l &cluster_off_l>; next-level-cache = <&l2_0>; #cooling-cells = <2>; @@ -62,7 +62,7 @@ cpu2: cpu@200 { enable-method = "psci"; performance-domains = <&performance 0>; clock-frequency = <1701000000>; - capacity-dmips-mhz = <578>; + capacity-dmips-mhz = <308>; cpu-idle-states = <&cpu_off_l &cluster_off_l>; next-level-cache = <&l2_0>; #cooling-cells = <2>; @@ -75,7 +75,7 @@ cpu3: cpu@300 { enable-method = "psci"; performance-domains = <&performance 0>; clock-frequency = <1701000000>; - capacity-dmips-mhz = <578>; + capacity-dmips-mhz = <308>; cpu-idle-states = <&cpu_off_l &cluster_off_l>; next-level-cache = <&l2_0>; #cooling-cells = <2>; -- 2.35.1