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=-3.8 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS 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 0173FC10DCE for ; Fri, 6 Mar 2020 12:56:27 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id D689521D7E for ; Fri, 6 Mar 2020 12:56:26 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726781AbgCFM4Z (ORCPT ); Fri, 6 Mar 2020 07:56:25 -0500 Received: from mail.baikalelectronics.com ([87.245.175.226]:35814 "EHLO mail.baikalelectronics.ru" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726171AbgCFM4Z (ORCPT ); Fri, 6 Mar 2020 07:56:25 -0500 Received: from localhost (unknown [127.0.0.1]) by mail.baikalelectronics.ru (Postfix) with ESMTP id 839ED80307C4; Fri, 6 Mar 2020 12:56:22 +0000 (UTC) X-Virus-Scanned: amavisd-new at baikalelectronics.ru Received: from mail.baikalelectronics.ru ([127.0.0.1]) by localhost (mail.baikalelectronics.ru [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id Yp3G-rPdHNLp; Fri, 6 Mar 2020 15:56:21 +0300 (MSK) From: CC: Serge Semin , Serge Semin , Alexey Malahov , Maxim Kaurkin , Pavel Parkhomenko , Ramil Zaripov , Ekaterina Skachko , Vadim Vlasov , Thomas Bogendoerfer , Paul Burton , Ralf Baechle , Daniel Lezcano , Thomas Gleixner , Subject: [PATCH 0/4] clocksource: Fix MIPS GIC and DW APB Timer for Baikal-T1 SoC support Date: Fri, 6 Mar 2020 15:56:00 +0300 MIME-Version: 1.0 Content-Transfer-Encoding: 7BIT Content-Type: text/plain; charset=US-ASCII X-ClientProxiedBy: MAIL.baikal.int (192.168.51.25) To mail (192.168.51.25) Message-Id: <20200306125622.839ED80307C4@mail.baikalelectronics.ru> To: unlisted-recipients:; (no To-header on input) Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Serge Semin Aside from MIPS-specific r4k timer Baikal-T1 chip also provides a functionality of two another timers: embedded into the MIPS GIC timer and three external DW timers available over APB bus. But we can't use them before the corresponding drivers are properly fixed. First of all DW APB Timer shouldn't be bound to a single CPU, since as being accessible over APB they are external with respect to all possible CPUs. Secondly there might be more than just two DW APB Timers in the system (Baikal-T1 has three of them), so permit the driver to use one of them as a clocksource and the rest - for clockevents. Thirdly it's possible to use MIPS GIC timer as a clocksource so register it in the corresponding subsystem (the patch has been found in the Paul Burton MIPS repo so I left the original Signed-off-by attribute). Finally in the same way as r4k timer the MIPS GIC timer should be used with care when CPUFREQ config is enabled since in case of CM2 the timer counting depends on the CPU reference clock frequency while the clocksource subsystem currently doesn't support the timers with non-stable clock. This patchset is rebased and tested on the mainline Linux kernel 5.6-rc4: commit 98d54f81e36b ("Linux 5.6-rc4"). Signed-off-by: Serge Semin Signed-off-by: Alexey Malahov Cc: Maxim Kaurkin Cc: Pavel Parkhomenko Cc: Ramil Zaripov Cc: Ekaterina Skachko Cc: Vadim Vlasov Cc: Thomas Bogendoerfer Cc: Paul Burton Cc: Ralf Baechle Cc: Daniel Lezcano Cc: Thomas Gleixner Cc: linux-kernel@vger.kernel.org Paul Burton (1): clocksource: mips-gic-timer: Register as sched_clock Serge Semin (3): clocksource: dw_apb_timer: Set clockevent any-possible-CPU mask clocksource: dw_apb_timer_of: Fix missing clockevent timers clocksource: mips-gic-timer: Set limitations on clocksource/sched-clocks usage drivers/clocksource/dw_apb_timer.c | 18 +++++++--------- drivers/clocksource/dw_apb_timer_of.c | 9 +++----- drivers/clocksource/mips-gic-timer.c | 30 ++++++++++++++++++++++----- include/linux/dw_apb_timer.h | 2 +- 4 files changed, 36 insertions(+), 23 deletions(-) -- 2.25.1