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=-0.8 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_PASS 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 8001AC6778C for ; Tue, 3 Jul 2018 15:14:04 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 429C7208E4 for ; Tue, 3 Jul 2018 15:14:04 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 429C7208E4 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=arm.com Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S933849AbeGCPNs (ORCPT ); Tue, 3 Jul 2018 11:13:48 -0400 Received: from usa-sjc-mx-foss1.foss.arm.com ([217.140.101.70]:50926 "EHLO foss.arm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S933569AbeGCPJt (ORCPT ); Tue, 3 Jul 2018 11:09:49 -0400 Received: from usa-sjc-imap-foss1.foss.arm.com (unknown [10.72.51.249]) by usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id B8C537A9; Tue, 3 Jul 2018 08:09:48 -0700 (PDT) Received: from [10.1.206.75] (usa-sjc-imap-foss1.foss.arm.com [10.72.51.249]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id 1A4193F5AD; Tue, 3 Jul 2018 08:09:46 -0700 (PDT) Subject: Re: [PATCH 0/2] Allwinner A64 timer workaround To: Samuel Holland , Maxime Ripard , Chen-Yu Tsai , Catalin Marinas , Will Deacon , Daniel Lezcano , Thomas Gleixner Cc: linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, linux-sunxi@googlegroups.com References: <20180511022751.9096-1-samuel@sholland.org> From: Marc Zyngier Organization: ARM Ltd Message-ID: <2c16d5ab-38f7-8f3e-875c-19e8032f440a@arm.com> Date: Tue, 3 Jul 2018 16:09:44 +0100 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101 Thunderbird/52.8.0 MIME-Version: 1.0 In-Reply-To: <20180511022751.9096-1-samuel@sholland.org> Content-Type: text/plain; charset=utf-8 Content-Language: en-GB Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 11/05/18 03:27, Samuel Holland wrote: > Hello, > > Several people (including me) have experienced extremely large system > clock jumps on their A64-based devices, apparently due to the > architectural timer going backward, which is interpreted by Linux as > the timer wrapping around after 2^56 cycles. > > Investigation led to discovery of some obvious problems with this SoC's > architectural timer, and this patch series introduces what I believe is > the simplest workaround. More details are in the commit message for > patch 1. Patch 2 simply enables the workaround in the device tree. What's the deal with this series? There was a couple of nits to address, and I was more or less expecting a v2. Thanks, M. -- Jazz is not dead. It just smells funny...