From patchwork Tue Jul 19 18:17:59 2016 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: fu.wei@linaro.org X-Patchwork-Id: 9238071 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork.web.codeaurora.org (Postfix) with ESMTP id 66100600CB for ; Tue, 19 Jul 2016 18:22:01 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 5D2D526929 for ; Tue, 19 Jul 2016 18:22:01 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 5146126E64; Tue, 19 Jul 2016 18:22:01 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-4.2 required=2.0 tests=BAYES_00, RCVD_IN_DNSWL_MED autolearn=ham version=3.3.1 Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.9]) (using TLSv1.2 with cipher AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by mail.wl.linuxfoundation.org (Postfix) with ESMTPS id E71FB26929 for ; Tue, 19 Jul 2016 18:22:00 +0000 (UTC) Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.85_2 #1 (Red Hat Linux)) id 1bPZd8-0002Tm-3x; Tue, 19 Jul 2016 18:20:30 +0000 Received: from mx1.redhat.com ([209.132.183.28]) by bombadil.infradead.org with esmtps (Exim 4.85_2 #1 (Red Hat Linux)) id 1bPZce-0000oi-Nm for linux-arm-kernel@lists.infradead.org; Tue, 19 Jul 2016 18:20:04 +0000 Received: from int-mx10.intmail.prod.int.phx2.redhat.com (int-mx10.intmail.prod.int.phx2.redhat.com [10.5.11.23]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id 5FDF5769E0; Tue, 19 Jul 2016 18:19:40 +0000 (UTC) Received: from rei-ayanami.redhat.com (vpn1-6-71.pek2.redhat.com [10.72.6.71]) by int-mx10.intmail.prod.int.phx2.redhat.com (8.14.4/8.14.4) with ESMTP id u6JIIgRq021432; Tue, 19 Jul 2016 14:19:29 -0400 From: fu.wei@linaro.org To: rjw@rjwysocki.net, lenb@kernel.org, daniel.lezcano@linaro.org, tglx@linutronix.de, marc.zyngier@arm.com, lorenzo.pieralisi@arm.com, sudeep.holla@arm.com, hanjun.guo@linaro.org Subject: [PATCH v8 4/9] clocksource/drivers/arm_arch_timer: use readq to get 64-bit CNTVCT Date: Wed, 20 Jul 2016 02:17:59 +0800 Message-Id: <1468952284-28942-5-git-send-email-fu.wei@linaro.org> In-Reply-To: <1468952284-28942-1-git-send-email-fu.wei@linaro.org> References: <1468952284-28942-1-git-send-email-fu.wei@linaro.org> X-Scanned-By: MIMEDefang 2.68 on 10.5.11.23 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.27]); Tue, 19 Jul 2016 18:19:40 +0000 (UTC) X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20160719_112001_274303_3766BBE8 X-CRM114-Status: GOOD ( 10.54 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.20 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: wei@redhat.com, harba@codeaurora.org, Fu Wei , al.stone@linaro.org, graeme.gregory@linaro.org, linaro-acpi@lists.linaro.org, jcm@redhat.com, timur@codeaurora.org, linux@roeck-us.net, will.deacon@arm.com, rruigrok@codeaurora.org, linux-kernel@vger.kernel.org, linux-acpi@vger.kernel.org, wim@iguana.be, arnd@arndb.de, cov@codeaurora.org, Suravee.Suthikulpanit@amd.com, catalin.marinas@arm.com, leo.duran@amd.com, linux-arm-kernel@lists.infradead.org, linux-watchdog@vger.kernel.org MIME-Version: 1.0 Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org X-Virus-Scanned: ClamAV using ClamSMTP From: Fu Wei This patch simplify arch_counter_get_cntvct_mem function by using readq to get 64-bit CNTVCT value instead of readl_relaxed. Signed-off-by: Fu Wei --- drivers/clocksource/arm_arch_timer.c | 10 +--------- 1 file changed, 1 insertion(+), 9 deletions(-) diff --git a/drivers/clocksource/arm_arch_timer.c b/drivers/clocksource/arm_arch_timer.c index e6fd42d..483d2f9 100644 --- a/drivers/clocksource/arm_arch_timer.c +++ b/drivers/clocksource/arm_arch_timer.c @@ -418,15 +418,7 @@ u32 arch_timer_get_rate(void) static u64 arch_counter_get_cntvct_mem(void) { - u32 vct_lo, vct_hi, tmp_hi; - - do { - vct_hi = readl_relaxed(arch_counter_base + CNTVCT_HI); - vct_lo = readl_relaxed(arch_counter_base + CNTVCT_LO); - tmp_hi = readl_relaxed(arch_counter_base + CNTVCT_HI); - } while (vct_hi != tmp_hi); - - return ((u64) vct_hi << 32) | vct_lo; + return readq(arch_counter_base + CNTVCT_LO); } /*