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=-10.3 required=3.0 tests=BAYES_00,DKIM_INVALID, DKIM_SIGNED,MAILING_LIST_MULTI,MENTIONS_GIT_HOSTING,SPF_HELO_NONE,SPF_PASS, URIBL_BLOCKED,USER_AGENT_SANE_2 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 EDF74C43457 for ; Fri, 9 Oct 2020 10:59:05 +0000 (UTC) Received: from merlin.infradead.org (merlin.infradead.org [205.233.59.134]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 7537322260 for ; Fri, 9 Oct 2020 10:59:05 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="signature verification failed" (2048-bit key) header.d=lists.infradead.org header.i=@lists.infradead.org header.b="aRq/X4iT"; dkim=fail reason="signature verification failed" (1024-bit key) header.d=kernel.org header.i=@kernel.org header.b="swBD8mH/" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 7537322260 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=kernel.org Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=merlin.20170209; h=Sender:Content-Transfer-Encoding: Content-Type:Cc:List-Subscribe:List-Help:List-Post:List-Archive: List-Unsubscribe:List-Id:MIME-Version:Message-ID:Subject:To:From:Date: Reply-To:Content-ID:Content-Description:Resent-Date:Resent-From:Resent-Sender :Resent-To:Resent-Cc:Resent-Message-ID:In-Reply-To:References:List-Owner; bh=S1Ih+2ylFQsAAb8BF2pR6OvIvqSvtm0OOE+w4vlsgdc=; b=aRq/X4iTOi0BOy8W7uXEwqevnk xdZ/gvQ/U4KQv5+JpYSlwstm9wb4PvBxhGOj0IHQp8Kt+qEnywr00xNEUycTbggeZUMUgANb7bGnQ Gd6GOrnxFjMVd4IfKVu2p8SWIZTqePVSM4w1ZigLvI//c8kOru8C2YVSg6rOScsGB10ZQX8YDU3qx Z8v1lYiYin3dNRS0VVlc4rUGu0NeSclqQYpOGks4eglXe50uqTwBHQB/HHUzGFLW875TYF98fjdhb W3zX6ZPjGIczajkArfMw/y5FnsGb4s264wz0uZqy15poezVwVeJnc7oScfn4+LlaK9DJ+c6FRKdgl s3CaGdQQ==; Received: from localhost ([::1] helo=merlin.infradead.org) by merlin.infradead.org with esmtp (Exim 4.92.3 #3 (Red Hat Linux)) id 1kQq5X-0006DD-P4; Fri, 09 Oct 2020 10:57:27 +0000 Received: from mail.kernel.org ([198.145.29.99]) by merlin.infradead.org with esmtps (Exim 4.92.3 #3 (Red Hat Linux)) id 1kQq5R-0006A7-6W for linux-arm-kernel@lists.infradead.org; Fri, 09 Oct 2020 10:57:22 +0000 Received: from localhost (otava-0257.koleje.cuni.cz [78.128.181.4]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 6946422251; Fri, 9 Oct 2020 10:57:17 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1602241039; bh=xPVPWQN5u3dZSXKautITqswGLvlc6dUXtA6/edgocNo=; h=Date:From:To:List-Id:Cc:Subject:From; b=swBD8mH/pvReoTlVy2Z7Cy0m0tMAo61XzGMK35lKeu31qW2umMK0ZUcmYlUW6oeeB FB5Kx7loZbWOyMNogOLLXsxJjykVSR6DE8qlwcL07mdEJSUwi8AGYlu7nV6v5cw9Bu sNYTN3/2DElcxbR35LKaxyWVKPhXp24Xqb+vAeCA= Date: Fri, 9 Oct 2020 12:57:11 +0200 From: Marek =?UTF-8?B?QmVow7pu?= To: arm@kernel.org Subject: Armada 3720 cpufreq bug: request for testing (EspressoBIN, uDPU, ...) Message-ID: <20201009125711.0176752a@kernel.org> X-Mailer: Claws Mail 3.17.6 (GTK+ 2.24.32; x86_64-pc-linux-gnu) MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20201009_065721_315560_C445FF12 X-CRM114-Status: GOOD ( 10.93 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , List-Id: Cc: Tomasz Maciej Nowak , Luka Perkov , Gregory CLEMENT , Andre Heider , soc@kernel.org, Vladimir Vid , Russell King , =?UTF-8?B?R8OpcmFsZA==?= Kerma , Miquel Raynal , Konstantin Porotchkin , pali@kernel.org, linux-arm-kernel@lists.infradead.org Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org Hello, I have a request for testing some patches that fix cpufreq issues on Armada 3720 (EspressoBIN, uDPU, Devel Board, maybe others?). It concerns top 4 commits of branch a3720-cpufreq-issues of repository https://git.kernel.org/pub/scm/linux/kernel/git/kabel/linux.git/ (log at https://git.kernel.org/pub/scm/linux/kernel/git/kabel/linux.git/log/?h=a3720-cpufreq-issues) We've discovered a bug in Armada 3720 cpufreq driver that causes base CPU frequency to drop to 800 MHz on systems configured to 1 GHz. More info here: https://www.spinics.net/lists/arm-kernel/msg844752.html The patchset above led us to discover another bug, in the SOC itself, that causes the CPU to behave weirdly when frequency changes to 1 GHz. A similar erratum is documented by Marvell but only for systems where base frequency is 1.2 GHz. We've discovered that to make cpufreq scaling stable on Armada 3720 on systems with base frequency 1 GHz, we also have to set voltage levels for L1, L2 and L3 loads to 1108 mV. (We were led to this by patch we found here https://forum.armbian.com/topic/10429-how-to-make-espressobin-v7-stable/page/2/?tab=comments#comment-80012). We would like you to build this sources and test the ondemand cpufreq governor on systems with variable CPU load, for at least 1 day (more is better). If you could also test the userspace governor and randomly change frequency, it would be great. Please let me know if and when you are willing to do this. Thank you. Marek & Pali _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel