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=-5.5 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS, URIBL_BLOCKED,USER_AGENT_SANE_1 autolearn=no 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 C93B5C433E0 for ; Fri, 19 Feb 2021 19:35:09 +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 6F45864E86 for ; Fri, 19 Feb 2021 19:35:07 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 6F45864E86 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:In-Reply-To:MIME-Version:References: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:List-Owner; bh=/szFb7h1HBYNp+Kwx1sTsIWl5loD1JiRU/FHi9HbUBs=; b=OT2hBGrhYHI9vI8PCh0PHldl/ lJ2qjkImCRux7aSffrSe/fbSPv+iAxWpJtcFwkL029t62fKu9mrVvw3BQgaG8d61MD7FTZ0tEWirV otqhpQd86tIfW+l/hykppvjdVKi5ctF9TIzb0XpRXoB8LMLrL+tOMsdUzJcbkWmaM26unUpPMsrbi 4zsPhhg9oRiDTttawCGmLmbTCq7uv2Tewbm2tdJxz+nmWG2op7hQY87RsNtAuGGy7pxG0YIfAaXXX +/d+3yWxZUMHRwI1/BpO+eef20MXK3JigXJoPdwKuRbmKecCzrtNUq+c4NHnDaXNG27DGFNXYPZpE r5CLHAo0Q==; Received: from localhost ([::1] helo=merlin.infradead.org) by merlin.infradead.org with esmtp (Exim 4.92.3 #3 (Red Hat Linux)) id 1lDBWX-0007dM-IZ; Fri, 19 Feb 2021 19:33:09 +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 1lDBWU-0007d0-Ql for linux-arm-kernel@lists.infradead.org; Fri, 19 Feb 2021 19:33:07 +0000 Received: by mail.kernel.org (Postfix) with ESMTPSA id F062464E86; Fri, 19 Feb 2021 19:33:04 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1613763185; bh=OlYQXP3dqUSDbZmjknWzUSYSrE2pfvSs23Pmh52NLO0=; h=Date:From:To:Cc:Subject:References:In-Reply-To:From; b=EVe8nd7JPREE3C1UU+aIlturXg9562K6GlwwviEhDVmKyzEJyJ6fqQHXTDZ+eSVHy UG5OWZ5Lq8akMmYR3MLrw/uOYZBZ0+zAfjswKwhi4ZbsZHaP7HXN0t+c2AdDYGo7et Tm2itE3aFZCpDaHBZKS8UQVMr1CLn/VAQklBGp6v0ZfVhsp35SCeV6iqi6FiNnQh6d LLifGbx4rNxbio8mIA5lQRLZrLwiQrgbR3n6NU9i6nOnim4fd8DAkzVrYBWS5PckBz OQLsqqlKO2xhxyJX4Dy9ljZ52bkZgC6qIPIkLGVoht0tX1xrCO7PQUiccSPR4yR6Ws 6oKwfJUuuEuxw== Received: by pali.im (Postfix) id B29157F6; Fri, 19 Feb 2021 20:33:02 +0100 (CET) Date: Fri, 19 Feb 2021 20:33:02 +0100 From: Pali =?utf-8?B?Um9ow6Fy?= To: nnet Subject: Re: [PATCH mvebu v2 00/10] Armada 37xx: Fix cpufreq changing base CPU speed to 800 MHz from 1000 MHz Message-ID: <20210219193302.odcjcaukxxjaedd5@pali> References: <20210211195559.n2j4jnchl2ho54mg@pali> <1ad78446-4a40-4c3e-8680-6dbf19616515@www.fastmail.com> <20210211234445.hbv2diphmgbir76u@pali> <000b92cc-9b54-4af9-b95c-d1317fb6f97f@www.fastmail.com> <20210213100139.ckrscepg72zjkj4f@pali> <20210214123310.d6armpep7kxbymbu@pali> <675b7a74-066b-4dc0-8dcb-f11c5606ae52@www.fastmail.com> <20210216104141.umy6zrrkal3dlj5j@pali> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: User-Agent: NeoMutt/20180716 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20210219_143306_953860_F33D7834 X-CRM114-Status: GOOD ( 13.86 ) 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: , Cc: Marek =?utf-8?B?QmVow7pu?= , andrew@lunn.ch, luka.perkov@sartura.hr, sboyd@kernel.org, gregory.clement@bootlin.com, a.heider@gmail.com, linux-kernel@vger.kernel.org, vladimir.vid@sartura.hr, mturquette@baylibre.com, rmk+kernel@armlinux.org.uk, tmn505@gmail.com, gerald@gk2.net, miquel.raynal@bootlin.com, kostap@marvell.com, linux-clk@vger.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 On Tuesday 16 February 2021 08:27:10 nnet wrote: > > Therefore I'm thinking if the correct way is instead to use L1 := L0 voltage value for 1/1.2 GHz mode. > > This latest 04/10 works fine for me going 600MHz <-> 1.2GHz under with and without load. Ok, thanks for testing! Just to note that typical documented value for 1.2GHz mode is 1.155V, so it would be useful to know if this value could be stable for L1 with 1.2GHz mode. I'm thinking that for 1GHz variant it would be better to rather use 1.108V like in my original patch as this is already tested by lot of people, nobody complained yet and it can be lower value as L0 (so there is benefit to decrease CPU frequency when CPU is idle). For 1.2GHz variant I still do not know. You wrote that 1.132V is unstable, so it cannot be used for sure. Documented typical value 1.155V is bigger, so maybe it can be stable but needs testing. And stable seems to be L0 value... But then I do not see a benefit for downclocking CPU from 1.2 GHz frequency in L0 to 600 MHz freq. in L1 if it use same CPU voltage... But it is still better than unstable CPU with crashes! Could you test if 1.155V voltage for L1 is stable on 1.2 GHz variant? _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel