From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752076AbcBOGg2 (ORCPT ); Mon, 15 Feb 2016 01:36:28 -0500 Received: from mailout2.w1.samsung.com ([210.118.77.12]:59816 "EHLO mailout2.w1.samsung.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751868AbcBOGg0 (ORCPT ); Mon, 15 Feb 2016 01:36:26 -0500 X-AuditID: cbfec7f5-f79b16d000005389-17-56c171e7e883 Subject: Re: [next] Odroid XU3 easily over-heats To: Viresh Kumar , Krzysztof Kozlowski References: <56C01963.3080106@gmail.com> <20160215052843.GA6334@vireshk-i7> Cc: Lukasz Majewski , Bartlomiej Zolnierkiewicz , "Rafael J. Wysocki" , Linux Kernel Mailing List , Zhang Rui , Eduardo Valentin , linux-arm-kernel@lists.infradead.org, linux-samsung-soc@vger.kernel.org, Javier Martinez Canillas , Kukjin Kim From: Krzysztof Kozlowski X-Enigmail-Draft-Status: N1110 Message-id: <56C171E2.90306@samsung.com> Date: Mon, 15 Feb 2016 15:36:18 +0900 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:38.0) Gecko/20100101 Thunderbird/38.5.1 MIME-version: 1.0 In-reply-to: <20160215052843.GA6334@vireshk-i7> Content-type: text/plain; charset=windows-1252 Content-transfer-encoding: 7bit X-Brightmail-Tracker: H4sIAAAAAAAAA+NgFprCIsWRmVeSWpSXmKPExsVy+t/xa7rPCw+GGWz5xGexccZ6Vov5V66x Wrx5u4bJ4vm/H+wWr18YWvQ/fs1s8ebhZkaLTY+Bkpd3zWGzmHF+H5PFmdOXWC2ePOxjs9j4 1cOB12PnrLvsHov3vGTy2LSqk83jzrU9bB6bl9R7bOkHim+52s7i0bdlFaPH501yAZxRXDYp qTmZZalF+nYJXBmNzVdYC3q5KtavO8zewNjG0cXIwSEhYCKxubu0i5ETyBSTuHBvPVsXIxeH kMBSRomdBxcxgySEBJ4ySmyeWw9iCwsYSEyesJcRxBYRiJb4sOcMG0SNt8SR2c1gzcwC25kl Jm1vAGtmEzCW2Lx8CRvEBjmJ3u5JLCA2r4CGxO91K5lAbBYBVYknN+aBDRUViJA43NnFDlEj KPFj8j2wek4BfYmX77cwgRzNLKAncf+iFkiYWUBeYvOat8wTGAVnIemYhVA1C0nVAkbmVYyi qaXJBcVJ6blGesWJucWleel6yfm5mxghcfV1B+PSY1aHGAU4GJV4eCPOHAgTYk0sK67MPcQo wcGsJMLrl34wTIg3JbGyKrUoP76oNCe1+BCjNAeLkjjvzF3vQ4QE0hNLUrNTUwtSi2CyTByc Ug2MehEOzDbR/stE3vxZUZb6M+A0r9SsUyqO4crKE5PvBNrO3hayxGJO+sqbSs79QhLWV0wf 9F2vZv5eI2ze1aRv2tRzoOzxVv+agtgXOkFaITmqbjGn1RdwCtwxSRURKz756YO97b5ppwp5 Xs/V6ow0yjMtLdmrVRtpdTjzVVcUX4Tz2X6zP0osxRmJhlrMRcWJAJ0vW9qnAgAA Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 15.02.2016 14:28, Viresh Kumar wrote: > On 14-02-16, 15:06, Krzysztof Kozlowski wrote: >> Hi all, >> >> With recent addition of cpufreq-dt support to Exynos5422 >> it is very easy to over-heat the Odroid XU3 leading to critical shutdown: > > How were OPPs passed earlier? I failed to see them in kernel somehow. > You must have been using opp-v1 earlier, right? Till now there was no support for cpufreq for Exynos542x. For some time Bartlomiej was developing these patches - using opp-v1 at beginning. I don't know whether he encountered this before. > > You used boost-freqs then? You used cpufreq as a cooling device then? > >> What about cpufreq as cooling device? Probably that part >> is missing now, right? > > Maybe, how was that earlier though ? Bootloader initialized frequency and regulators to some safe defaults. I think the voltage set by uboot is 1 V (for big and little) which corresponds to ~800 MHz of frequency (I don't know the exact frequency because it is hardcoded as divider value...). However there was no cooling device except fan. This did not change. So the only difference seems to be that now at critical shutdown moment it operates at 1300 MHz / 1.275 V (little) and 1800 MHz / 1.250 V (big). Best regards, Krzysztof