From patchwork Fri Jun 5 17:03:54 2015 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Caesar Wang X-Patchwork-Id: 6556591 Return-Path: X-Original-To: patchwork-linux-arm@patchwork.kernel.org Delivered-To: patchwork-parsemail@patchwork2.web.kernel.org Received: from mail.kernel.org (mail.kernel.org [198.145.29.136]) by patchwork2.web.kernel.org (Postfix) with ESMTP id E894AC0020 for ; Fri, 5 Jun 2015 17:15:28 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id E291E205F7 for ; Fri, 5 Jun 2015 17:15:27 +0000 (UTC) Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.9]) (using TLSv1.2 with cipher DHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id E5E47205EC for ; Fri, 5 Jun 2015 17:15:26 +0000 (UTC) Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.80.1 #2 (Red Hat Linux)) id 1Z0v3n-0006Xi-Js; Fri, 05 Jun 2015 17:05:35 +0000 Received: from mail-pd0-f169.google.com ([209.85.192.169]) by bombadil.infradead.org with esmtps (Exim 4.80.1 #2 (Red Hat Linux)) id 1Z0v3I-0004hT-5f; Fri, 05 Jun 2015 17:05:04 +0000 Received: by pdjm12 with SMTP id m12so57031265pdj.3; Fri, 05 Jun 2015 10:04:42 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20130820; h=from:to:cc:subject:date:message-id:in-reply-to:references; bh=U31no/HeRUCmfkNPPUGJog99yCKFKYo+FevVMShwuVM=; b=eE/XSrkGTuRBhSPbuNLN1rdsvW+/TkadycRvyv4J+lis2WOO6/0A3Q18CwjrKAvj0D 9XKr3HG+GosIQJDVAYP6vPLyJfpEA7GWUNi2jtZIrc51lSsW8XEEHERBbIFjOkjrISFd gy32MuoFvQMJOAvsIq13Wf18UmAj5VYQeQhE03qBKguIbqXtVFSINxHU1Nsui6miNyCa w44zZ5mDN9+/UGmG0/KizUGMgx60+H11sJWRrJ0MvnqEJemcOUNbZPu1CZvOL6NDWImJ cijvw2Evsc614gUQp6C5s/mbPhNcJ//LMmUcW3SQijP3Z6HMejia1Iehav2BPQwHKb+O G1iA== X-Received: by 10.68.232.164 with SMTP id tp4mr7343373pbc.101.1433523882867; Fri, 05 Jun 2015 10:04:42 -0700 (PDT) Received: from localhost.localdomain ([103.47.144.150]) by mx.google.com with ESMTPSA id he9sm7285279pbc.7.2015.06.05.10.04.35 (version=TLSv1.2 cipher=ECDHE-RSA-AES128-SHA bits=128/128); Fri, 05 Jun 2015 10:04:41 -0700 (PDT) From: Caesar Wang To: Heiko Stuebner Subject: [PATCH v4 2/3] ARM: rockchip: ensure CPU to enter WFI/WFE state Date: Sat, 6 Jun 2015 01:03:54 +0800 Message-Id: <1433523836-4299-3-git-send-email-wxt@rock-chips.com> X-Mailer: git-send-email 1.9.1 In-Reply-To: <1433523836-4299-1-git-send-email-wxt@rock-chips.com> References: <1433523836-4299-1-git-send-email-wxt@rock-chips.com> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20150605_100504_291223_A9A53509 X-CRM114-Status: UNSURE ( 8.53 ) X-CRM114-Notice: Please train this message. X-Spam-Score: -1.8 (-) Cc: Russell King , Dmitry Torokhov , dianders@chromium.org, linux-kernel@vger.kernel.org, linux-rockchip@lists.infradead.org, linux-arm-kernel@lists.infradead.org, Caesar Wang X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.18-1 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , MIME-Version: 1.0 Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org X-Spam-Status: No, score=-4.2 required=5.0 tests=BAYES_00, RCVD_IN_DNSWL_MED, T_RP_MATCHES_RCVD, UNPARSEABLE_RELAY autolearn=unavailable version=3.3.1 X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on mail.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP In idle mode, core1/2/3 of Cortex-A17 should be either power off or in WFI/WFE state. we can delay 1ms to ensure the CPU enter WFI/WFE state. Signed-off-by: Caesar Wang --- arch/arm/mach-rockchip/platsmp.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/arch/arm/mach-rockchip/platsmp.c b/arch/arm/mach-rockchip/platsmp.c index a297b86..d809fbc 100644 --- a/arch/arm/mach-rockchip/platsmp.c +++ b/arch/arm/mach-rockchip/platsmp.c @@ -327,6 +327,9 @@ static void __init rockchip_smp_prepare_cpus(unsigned int max_cpus) #ifdef CONFIG_HOTPLUG_CPU static int rockchip_cpu_kill(unsigned int cpu) { + /* ensure CPU can enter the WFI/WFE state */ + mdelay(1); + pmu_set_power_domain(0 + cpu, false); return 1; }