From patchwork Fri Jun 5 11:39:21 2015 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Caesar Wang X-Patchwork-Id: 6552861 Return-Path: X-Original-To: patchwork-linux-rockchip@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 3E9C0C0020 for ; Fri, 5 Jun 2015 11:40:25 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id 653DC20762 for ; Fri, 5 Jun 2015 11:40:24 +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 8175720558 for ; Fri, 5 Jun 2015 11:40:23 +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 1Z0pz5-0002pX-1H; Fri, 05 Jun 2015 11:40:23 +0000 Received: from mail-pd0-f175.google.com ([209.85.192.175]) by bombadil.infradead.org with esmtps (Exim 4.80.1 #2 (Red Hat Linux)) id 1Z0pyo-0001ae-Ro; Fri, 05 Jun 2015 11:40:08 +0000 Received: by pdjm12 with SMTP id m12so51842213pdj.3; Fri, 05 Jun 2015 04:39:45 -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=TBwlB6wJ533vCTX7R49/1bGpqVmMp806Bi2/wDdp2gI=; b=gErbzCfEFtjYeKW5yBPD4zz6D1PUbm2OIWg2IjWEvIrjJi/ufcxsX5c4Waw1LoxEvd mgM6HJp5i5g6nHXexcYIIEXhXdwzUcIagsuVNvjzi7autvw7E9IJoxlxYHr+uZAxnk6z V18IFo630y7DGf7H8CU33J8Ni8Kv/RZnTyZHwaoGfLw08cTAG4uLerl8SEvr52hWadDy MmNBwKKTdrq/t2LSDGEKltvi0NRD6Mxud5lRu1k4kR+slfd0MIsoYRW4p2IzC1ahTFGs h/rONWu47V6DJYV9QsY842n4/YqnyJrdE4S/FCpi3+KkFyBz7dp074vwplGuLVBLpSOC xqfg== X-Received: by 10.66.232.134 with SMTP id to6mr5263274pac.96.1433504385463; Fri, 05 Jun 2015 04:39:45 -0700 (PDT) Received: from localhost.localdomain ([191.101.57.89]) by mx.google.com with ESMTPSA id xo3sm6505189pbb.74.2015.06.05.04.39.41 (version=TLSv1.2 cipher=ECDHE-RSA-AES128-SHA bits=128/128); Fri, 05 Jun 2015 04:39:44 -0700 (PDT) From: Caesar Wang To: Heiko Stuebner Subject: [PATCH v2 2/3] ARM: rockchip: ensure CPU to enter WFI/WFE state Date: Fri, 5 Jun 2015 19:39:21 +0800 Message-Id: <1433504362-7549-3-git-send-email-wxt@rock-chips.com> X-Mailer: git-send-email 1.9.1 In-Reply-To: <1433504362-7549-1-git-send-email-wxt@rock-chips.com> References: <1433504362-7549-1-git-send-email-wxt@rock-chips.com> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20150605_044006_978232_C0500F30 X-CRM114-Status: UNSURE ( 8.69 ) 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-rockchip@lists.infradead.org X-Mailman-Version: 2.1.18-1 Precedence: list List-Id: Upstream kernel work for Rockchip platforms List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , MIME-Version: 1.0 Sender: "Linux-rockchip" Errors-To: linux-rockchip-bounces+patchwork-linux-rockchip=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 1d4659e..17b3473 100644 --- a/arch/arm/mach-rockchip/platsmp.c +++ b/arch/arm/mach-rockchip/platsmp.c @@ -335,6 +335,9 @@ 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; }