From patchwork Fri Jun 5 04:47:56 2015 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Caesar Wang X-Patchwork-Id: 6550891 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 417E3C0020 for ; Fri, 5 Jun 2015 04:48:57 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id 68DDA2074B for ; Fri, 5 Jun 2015 04:48:56 +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 A082520747 for ; Fri, 5 Jun 2015 04:48:55 +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 1Z0jYt-0006nU-7g; Fri, 05 Jun 2015 04:48:55 +0000 Received: from mail-pa0-f43.google.com ([209.85.220.43]) by bombadil.infradead.org with esmtps (Exim 4.80.1 #2 (Red Hat Linux)) id 1Z0jYZ-0006el-50; Fri, 05 Jun 2015 04:48:35 +0000 Received: by padj3 with SMTP id j3so42989851pad.0; Thu, 04 Jun 2015 21:48:14 -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=ZfC1U2w0gdfFOD5u1plAjnEZ8aiEXNBFpCdJLfGJluE=; b=CT7oM6iy/BGclSOxVme1MT4v+vnhi7/5VWPV6IssSMbCQFsLrPcYd5tmeWhfONemF1 HI52HxBF4VZheHZBP7sUNfB/9MUTW5EQPigTUPxVob1Zt0UzI4+GT1tpXG+1f/akc6w+ zYNnoMNl3BgIyFtXii0DwZ1uIvuVvDu/AI8IsCp+957QQmCXtqZIbCBvVEz9tnnLdnFP g8fFct9eeKdbKF3xRSSD/NEqiaq8MwdwDtvpwiDM2BoXTmw/E8mgvETp8A5AvcwA4syw Bt94okmgrFH3sOWjYT1rHiJK3v31l6hpLEbuzv2wfAuJDUtHekqPAhFM8Ey9iT3Tijqq OcYQ== X-Received: by 10.70.55.41 with SMTP id o9mr2780800pdp.80.1433479694035; Thu, 04 Jun 2015 21:48:14 -0700 (PDT) Received: from localhost.localdomain ([191.101.57.89]) by mx.google.com with ESMTPSA id c10sm5209803pbu.81.2015.06.04.21.48.10 (version=TLSv1.2 cipher=ECDHE-RSA-AES128-SHA bits=128/128); Thu, 04 Jun 2015 21:48:12 -0700 (PDT) From: Caesar Wang To: Heiko Stuebner Subject: [PATCH 2/3] ARM: rockchip: ensure CPU to enter WIF state Date: Fri, 5 Jun 2015 12:47:56 +0800 Message-Id: <1433479677-18086-3-git-send-email-wxt@rock-chips.com> X-Mailer: git-send-email 1.9.1 In-Reply-To: <1433479677-18086-1-git-send-email-wxt@rock-chips.com> References: <1433479677-18086-1-git-send-email-wxt@rock-chips.com> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20150604_214835_243195_83766BD6 X-CRM114-Status: UNSURE ( 8.70 ) 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 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 1230d3d..978c357 100644 --- a/arch/arm/mach-rockchip/platsmp.c +++ b/arch/arm/mach-rockchip/platsmp.c @@ -316,6 +316,9 @@ 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; }