From patchwork Wed Oct 9 08:04:03 2013 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Shawn Guo X-Patchwork-Id: 281735 Return-Path: X-Original-To: incoming-imx@patchwork.ozlabs.org Delivered-To: patchwork-incoming-imx@bilbo.ozlabs.org Received: from casper.infradead.org (casper.infradead.org [IPv6:2001:770:15f::2]) (using TLSv1.2 with cipher DHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (Client did not present a certificate) by ozlabs.org (Postfix) with ESMTPS id B52772C00BE for ; Wed, 9 Oct 2013 19:05:07 +1100 (EST) Received: from merlin.infradead.org ([2001:4978:20e::2]) by casper.infradead.org with esmtps (Exim 4.80.1 #2 (Red Hat Linux)) id 1VTolA-0002O8-4B; Wed, 09 Oct 2013 08:04:44 +0000 Received: from localhost ([::1] helo=merlin.infradead.org) by merlin.infradead.org with esmtp (Exim 4.80.1 #2 (Red Hat Linux)) id 1VTol7-0002ic-AQ; Wed, 09 Oct 2013 08:04:41 +0000 Received: from co1ehsobe006.messaging.microsoft.com ([216.32.180.189] helo=co1outboundpool.messaging.microsoft.com) by merlin.infradead.org with esmtps (Exim 4.80.1 #2 (Red Hat Linux)) id 1VTol4-0002hj-FQ for linux-arm-kernel@lists.infradead.org; Wed, 09 Oct 2013 08:04:39 +0000 Received: from mail184-co1-R.bigfish.com (10.243.78.243) by CO1EHSOBE020.bigfish.com (10.243.66.83) with Microsoft SMTP Server id 14.1.225.22; Wed, 9 Oct 2013 08:04:13 +0000 Received: from mail184-co1 (localhost [127.0.0.1]) by mail184-co1-R.bigfish.com (Postfix) with ESMTP id D4C75480202; Wed, 9 Oct 2013 08:04:12 +0000 (UTC) X-Forefront-Antispam-Report: CIP:70.37.183.190; KIP:(null); UIP:(null); IPV:NLI; H:mail.freescale.net; RD:none; EFVD:NLI X-SpamScore: 0 X-BigFish: VS0(zzzz1f42h208ch1ee6h1de0h1fdah2073h1202h1e76h1d1ah1d2ah1fc6hzz1de098h1de097h8275dhz2dh87h2a8h839hd24he5bhf0ah1288h12a5h12a9h12bdh12e5h137ah139eh13b6h1441h1504h1537h162dh1631h1758h1898h18e1h1946h19b5h1ad9h1b0ah1b2fh1fb3h1d0ch1d2eh1d3fh1dc1h1dfeh1dffh1e23h1fe8h1ff5h1151h1155h) X-FB-DOMAIN-IP-MATCH: fail Received: from mail184-co1 (localhost.localdomain [127.0.0.1]) by mail184-co1 (MessageSwitch) id 1381305823198010_25185; Wed, 9 Oct 2013 08:03:43 +0000 (UTC) Received: from CO1EHSMHS010.bigfish.com (unknown [10.243.78.247]) by mail184-co1.bigfish.com (Postfix) with ESMTP id 1D8941002A1; Wed, 9 Oct 2013 08:03:43 +0000 (UTC) Received: from mail.freescale.net (70.37.183.190) by CO1EHSMHS010.bigfish.com (10.243.66.20) with Microsoft SMTP Server (TLS) id 14.16.227.3; Wed, 9 Oct 2013 08:03:41 +0000 Received: from az84smr01.freescale.net (10.64.34.197) by 039-SN1MMR1-005.039d.mgd.msft.net (10.84.1.17) with Microsoft SMTP Server (TLS) id 14.3.158.2; Wed, 9 Oct 2013 08:03:41 +0000 Received: from S2101-09.ap.freescale.net ([10.192.185.121]) by az84smr01.freescale.net (8.14.3/8.14.0) with ESMTP id r9983cgC026754; Wed, 9 Oct 2013 01:03:39 -0700 From: Shawn Guo To: Subject: [PATCH] ARM: imx: reset core along with enable/disable operation Date: Wed, 9 Oct 2013 16:04:03 +0800 Message-ID: <1381305843-26478-1-git-send-email-shawn.guo@linaro.org> X-Mailer: git-send-email 1.7.9.5 MIME-Version: 1.0 X-OriginatorOrg: sigmatel.com X-FOPE-CONNECTOR: Id%0$Dn%*$RO%0$TLS%0$FQDN%$TlsDn% X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20131009_040438_633729_04212704 X-CRM114-Status: UNSURE ( 8.17 ) X-CRM114-Notice: Please train this message. X-Spam-Score: -1.9 (-) X-Spam-Report: SpamAssassin version 3.3.2 on merlin.infradead.org summary: Content analysis details: (-1.9 points) pts rule name description ---- ---------------------- -------------------------------------------------- -0.7 RCVD_IN_DNSWL_LOW RBL: Sender listed at http://www.dnswl.org/, low trust [216.32.180.189 listed in list.dnswl.org] 0.7 SPF_SOFTFAIL SPF: sender does not match SPF record (softfail) -1.9 BAYES_00 BODY: Bayes spam probability is 0 to 1% [score: 0.0000] Cc: Shawn Guo X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.15 Precedence: list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+incoming-imx=patchwork.ozlabs.org@lists.infradead.org List-Id: linux-imx-kernel.lists.patchwork.ozlabs.org >From hotplug stress test result, resetting core during enable/disable operation can improve cpu hotplug stability. So let's set SRC reset bit in imx_enable_cpu() for the core when its enable bit is accessed. Signed-off-by: Shawn Guo --- arch/arm/mach-imx/src.c | 1 + 1 file changed, 1 insertion(+) diff --git a/arch/arm/mach-imx/src.c b/arch/arm/mach-imx/src.c index 10a6b1a..4754373 100644 --- a/arch/arm/mach-imx/src.c +++ b/arch/arm/mach-imx/src.c @@ -91,6 +91,7 @@ void imx_enable_cpu(int cpu, bool enable) spin_lock(&scr_lock); val = readl_relaxed(src_base + SRC_SCR); val = enable ? val | mask : val & ~mask; + val |= 1 << (BP_SRC_SCR_CORE1_RST + cpu - 1); writel_relaxed(val, src_base + SRC_SCR); spin_unlock(&scr_lock); }