From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751740AbbCTOEd (ORCPT ); Fri, 20 Mar 2015 10:04:33 -0400 Received: from mail-we0-f170.google.com ([74.125.82.170]:35294 "EHLO mail-we0-f170.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750764AbbCTOEc (ORCPT ); Fri, 20 Mar 2015 10:04:32 -0400 Message-ID: <550C28EC.2040800@linaro.org> Date: Fri, 20 Mar 2015 15:04:28 +0100 From: Daniel Lezcano User-Agent: Mozilla/5.0 (X11; Linux i686; rv:31.0) Gecko/20100101 Thunderbird/31.4.0 MIME-Version: 1.0 To: Maxime Ripard , Thomas Gleixner CC: linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org Subject: Re: [PATCH v3 0/5] clocksource: sun5i: Support parent clock rate changes References: <1425550856-12928-1-git-send-email-maxime.ripard@free-electrons.com> <20150319225344.GF4255@lukather> In-Reply-To: <20150319225344.GF4255@lukather> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 03/19/2015 11:53 PM, Maxime Ripard wrote: > Hi Daniel, > > On Thu, Mar 05, 2015 at 11:20:51AM +0100, Maxime Ripard wrote: >> Hi, >> >> The Allwinner HS timers have the AHB clock as their parent >> clock. Since this clock is shared with other devices, we could very >> well have another driver requesting a rate change of that clock, >> making our timer change frequency at the same time. >> >> This is especially true on the A31, where the DMA controller needs to >> do such a rate change, making the HS timer unreliable at the time on >> the A31. >> >> This serie makes some cleanups and implements clock notifiers to be >> able to reflect such rate changes and make sure that the timer is >> always working. >> >> Maxime >> >> Changes from v2: >> - Rebased on top of v4.0-rc1 >> - Removed the local_irq_save/restore around clockevents_update_freq >> >> Changes from v1: >> - Changed the interrupt name to its previous value >> >> Maxime Ripard (5): >> clocksource: sun5i: Switch to request_irq >> clocksource: sun5i: Use of_io_request_and_map >> clocksource: sun5i: Remove sched_clock >> clocksource: sun5i: Refactor the current code >> clocksource: sun5i: Add clock notifiers > > Have these patches been merged? > > If not, it woulde be great if the third one ("clocksource: sun5i: > Remove sched_clock") was merged for 4.0. > > The sched_clock we use on some system is this timer's, and since we > started using cpufreq, the cpu clock (that is one of the timer's clock > indirect parent) now changes, along with the actual sched_clock rate. > > We can safely remove the sched_clock on those systems, since we have > other reliable sched_clock in the system. Ok, I applied the patch for v4.0-rc5 but I had to fix a conflict and change the changelog. Mind to test it works ? git.linaro.org/people/daniel.lezcano/linux.git clockevents/v4.0-rc4 Thanks -- Daniel -- Linaro.org │ Open source software for ARM SoCs Follow Linaro: Facebook | Twitter | Blog