From patchwork Fri Jun 5 15:11:43 2015 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Caesar Wang X-Patchwork-Id: 6556011 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 667DCC0020 for ; Fri, 5 Jun 2015 15:21:00 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id 6993920643 for ; Fri, 5 Jun 2015 15:20:59 +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 9189F2062C for ; Fri, 5 Jun 2015 15:20:58 +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 1Z0tLt-00049H-Me; Fri, 05 Jun 2015 15:16:09 +0000 Received: from mail-pa0-f44.google.com ([209.85.220.44]) by bombadil.infradead.org with esmtps (Exim 4.80.1 #2 (Red Hat Linux)) id 1Z0tJ6-0001DY-Sh; Fri, 05 Jun 2015 15:13:18 +0000 Received: by payr10 with SMTP id r10so52598180pay.1; Fri, 05 Jun 2015 08:12:53 -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=hyfRG5p1r6HfWg+96IHyRnlR99LXlIindwFl087/RJo=; b=lBVLe9f53buiT4F7yY8y6l/onyuhSkL6iAZZ2J8btvVRf2agKB1GMPJ+RCT7i9OU8g dFuK9ygfwRTSyRc0j7inkhfrp1AQgMPSjOHnU3iy6PLOw+h/BbKVko7mKlzhCoccN2Tb GpGLOhwX+LjLuEYsr+WOdf1RrmjbyvI1W8lZLabkmcHfEdp02jonNw5MQey6swi3nLhH xX/+5RfQIPKOTveErN7EuDG2cpoBnNSSD+QwWDKD+RRDWji+E7Wxc2EYbbTuFMhVxj5+ 6HIyJz60ndKjXJtRJE3Sb/fc6wW4yylijWSSw/2N2WfBo3lDzMLjLUGpLY+devspaD10 iIsA== X-Received: by 10.67.7.162 with SMTP id dd2mr6535722pad.151.1433517173886; Fri, 05 Jun 2015 08:12:53 -0700 (PDT) Received: from localhost.localdomain ([103.47.144.43]) by mx.google.com with ESMTPSA id bt16sm7100959pdb.91.2015.06.05.08.12.48 (version=TLSv1.2 cipher=ECDHE-RSA-AES128-SHA bits=128/128); Fri, 05 Jun 2015 08:12:52 -0700 (PDT) From: Caesar Wang To: Heiko Stuebner Subject: [PATCH v3 2/3] ARM: rockchip: ensure CPU to enter WFI/WFE state Date: Fri, 5 Jun 2015 23:11:43 +0800 Message-Id: <1433517104-7595-3-git-send-email-wxt@rock-chips.com> X-Mailer: git-send-email 1.9.1 In-Reply-To: <1433517104-7595-1-git-send-email-wxt@rock-chips.com> References: <1433517104-7595-1-git-send-email-wxt@rock-chips.com> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20150605_081317_038253_A957C920 X-CRM114-Status: UNSURE ( 8.58 ) 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 25da16f..6672fdd 100644 --- a/arch/arm/mach-rockchip/platsmp.c +++ b/arch/arm/mach-rockchip/platsmp.c @@ -325,6 +325,9 @@ 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; }