From patchwork Mon Feb 6 18:50:05 2017 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Fu Wei Fu X-Patchwork-Id: 93475 Delivered-To: patch@linaro.org Received: by 10.140.20.99 with SMTP id 90csp1834584qgi; Mon, 6 Feb 2017 10:51:59 -0800 (PST) X-Received: by 10.99.217.17 with SMTP id r17mr15145792pgg.140.1486407119823; Mon, 06 Feb 2017 10:51:59 -0800 (PST) Return-Path: Received: from vger.kernel.org (vger.kernel.org. [209.132.180.67]) by mx.google.com with ESMTP id p12si1475433pgf.304.2017.02.06.10.51.59; Mon, 06 Feb 2017 10:51:59 -0800 (PST) Received-SPF: pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) client-ip=209.132.180.67; Authentication-Results: mx.google.com; spf=pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=fail (p=NONE sp=NONE dis=NONE) header.from=linaro.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752418AbdBFSvd (ORCPT + 25 others); Mon, 6 Feb 2017 13:51:33 -0500 Received: from mx1.redhat.com ([209.132.183.28]:51202 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752377AbdBFSvb (ORCPT ); Mon, 6 Feb 2017 13:51:31 -0500 Received: from int-mx14.intmail.prod.int.phx2.redhat.com (int-mx14.intmail.prod.int.phx2.redhat.com [10.5.11.27]) (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 A96178046B; Mon, 6 Feb 2017 18:51:31 +0000 (UTC) Received: from Rei-Ayanami.localdomain (vpn1-7-227.pek2.redhat.com [10.72.7.227]) by int-mx14.intmail.prod.int.phx2.redhat.com (8.14.4/8.14.4) with ESMTP id v16Ioopd003413; Mon, 6 Feb 2017 13:51:22 -0500 From: fu.wei@linaro.org To: rjw@rjwysocki.net, lenb@kernel.org, daniel.lezcano@linaro.org, tglx@linutronix.de, marc.zyngier@arm.com, mark.rutland@arm.com, lorenzo.pieralisi@arm.com, sudeep.holla@arm.com, hanjun.guo@linaro.org Cc: linux-arm-kernel@lists.infradead.org, linaro-acpi@lists.linaro.org, linux-kernel@vger.kernel.org, linux-acpi@vger.kernel.org, rruigrok@codeaurora.org, harba@codeaurora.org, cov@codeaurora.org, timur@codeaurora.org, graeme.gregory@linaro.org, al.stone@linaro.org, jcm@redhat.com, wei@redhat.com, arnd@arndb.de, catalin.marinas@arm.com, will.deacon@arm.com, Suravee.Suthikulpanit@amd.com, leo.duran@amd.com, wim@iguana.be, linux@roeck-us.net, linux-watchdog@vger.kernel.org, tn@semihalf.com, christoffer.dall@linaro.org, julien.grall@arm.com, Fu Wei Subject: [PATCH v21 03/13] clocksource: arm_arch_timer: remove arch_timer_detect_rate Date: Tue, 7 Feb 2017 02:50:05 +0800 Message-Id: <20170206185015.12296-4-fu.wei@linaro.org> In-Reply-To: <20170206185015.12296-1-fu.wei@linaro.org> References: <20170206185015.12296-1-fu.wei@linaro.org> X-Scanned-By: MIMEDefang 2.68 on 10.5.11.27 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.28]); Mon, 06 Feb 2017 18:51:32 +0000 (UTC) Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Fu Wei The original counter frequency detection call(arch_timer_detect_rate) include getting the frequency from the per-cpu arch-timer and the memory-mapped (MMIO) timer interfaces. But they will be needed only when the system initializes the relevant timer. This patch remove arch_timer_detect_rate founction, and use the arch_timer_get_sysreg_freq and arch_timer_get_mmio_freq directly. Signed-off-by: Fu Wei --- drivers/clocksource/arm_arch_timer.c | 38 +++++++++++++++--------------------- 1 file changed, 16 insertions(+), 22 deletions(-) -- 2.9.3 diff --git a/drivers/clocksource/arm_arch_timer.c b/drivers/clocksource/arm_arch_timer.c index aa14305..63fb441 100644 --- a/drivers/clocksource/arm_arch_timer.c +++ b/drivers/clocksource/arm_arch_timer.c @@ -571,25 +571,6 @@ static u32 arch_timer_get_mmio_freq(void __iomem *cntbase) return readl_relaxed(cntbase + CNTFRQ); } -static void arch_timer_detect_rate(void __iomem *cntbase) -{ - /* Who has more than one independent system counter? */ - if (arch_timer_rate) - return; - - /* - * Try to determine the frequency from the MMIO timer or the sysreg. - */ - if (cntbase) - arch_timer_rate = arch_timer_get_mmio_freq(cntbase); - else - arch_timer_rate = arch_timer_get_sysreg_freq(); - - /* Check the timer frequency. */ - if (arch_timer_rate == 0) - pr_warn("frequency not available\n"); -} - static void arch_timer_banner(unsigned type) { pr_info("%s%s%s timer(s) running at %lu.%02luMHz (%s%s%s).\n", @@ -970,7 +951,11 @@ static int __init arch_timer_of_init(struct device_node *np) */ if (!arch_timer_rate && of_property_read_u32(np, "clock-frequency", &arch_timer_rate)) - arch_timer_detect_rate(NULL); + arch_timer_rate = arch_timer_get_sysreg_freq(); + if (!arch_timer_rate) { + pr_err(FW_BUG "frequency not available.\n"); + return -EINVAL; + } arch_timer_c3stop = !of_property_read_bool(np, "always-on"); @@ -1087,7 +1072,12 @@ static int __init arch_timer_mem_init(struct device_node *np) */ if (!arch_timer_rate && of_property_read_u32(np, "clock-frequency", &arch_timer_rate)) - arch_timer_detect_rate(base); + arch_timer_rate = arch_timer_get_mmio_freq(base); + if (!arch_timer_rate) { + pr_err(FW_BUG "frequency not available for MMIO timer.\n"); + ret = -EINVAL; + goto out; + } ret = arch_timer_mem_register(base, irq); if (ret) @@ -1150,7 +1140,11 @@ static int __init arch_timer_acpi_init(struct acpi_table_header *table) gtdt->non_secure_el2_flags); /* Get the frequency from the sysreg CNTFRQ */ - arch_timer_detect_rate(NULL); + arch_timer_rate = arch_timer_get_sysreg_freq(); + if (!arch_timer_rate) { + pr_err(FW_BUG "frequency not available.\n"); + return -EINVAL; + } arch_timer_uses_ppi = arch_timer_select_ppi(); if (!arch_timer_ppi[arch_timer_uses_ppi]) {