From patchwork Tue Jan 15 08:13:12 2013 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Hiroshi DOYU X-Patchwork-Id: 2073601 Return-Path: X-Original-To: patchwork-linux-arm@patchwork.kernel.org Delivered-To: patchwork-process-083081@patchwork1.kernel.org Received: from merlin.infradead.org (merlin.infradead.org [205.233.59.134]) by patchwork1.kernel.org (Postfix) with ESMTP id 690033FD1A for ; Thu, 31 Jan 2013 12:58:47 +0000 (UTC) Received: from localhost ([::1] helo=merlin.infradead.org) by merlin.infradead.org with esmtp (Exim 4.76 #1 (Red Hat Linux)) id 1U0tgm-0005lt-AV; Thu, 31 Jan 2013 12:56:24 +0000 Received: from hqemgate03.nvidia.com ([216.228.121.140]) by merlin.infradead.org with esmtps (Exim 4.76 #1 (Red Hat Linux)) id 1Tv1eg-0006mJ-V7 for linux-arm-kernel@lists.infradead.org; Tue, 15 Jan 2013 08:14:00 +0000 Received: from hqnvupgp05.nvidia.com (Not Verified[216.228.121.13]) by hqemgate03.nvidia.com id ; Tue, 15 Jan 2013 00:18:04 -0800 Received: from hqemhub02.nvidia.com ([172.17.108.22]) by hqnvupgp05.nvidia.com (PGP Universal service); Tue, 15 Jan 2013 00:13:13 -0800 X-PGP-Universal: processed; by hqnvupgp05.nvidia.com on Tue, 15 Jan 2013 00:13:13 -0800 Received: from hqnvemgw02.nvidia.com (172.16.227.111) by hqemhub02.nvidia.com (172.20.150.31) with Microsoft SMTP Server id 8.3.279.1; Tue, 15 Jan 2013 00:13:57 -0800 Received: from daphne.nvidia.com (Not Verified[172.16.212.96]) by hqnvemgw02.nvidia.com with MailMarshal (v6,7,2,8378) id ; Tue, 15 Jan 2013 00:13:57 -0800 Received: from oreo.Nvidia.com (dhcp-10-21-25-186.nvidia.com [10.21.25.186]) by daphne.nvidia.com (8.13.8+Sun/8.8.8) with ESMTP id r0F8Dn38018770; Tue, 15 Jan 2013 00:13:56 -0800 (PST) From: Hiroshi Doyu To: Subject: [v3 3/9] ARM: tegra: Use DT /cpu node to detect number of CPU core Date: Tue, 15 Jan 2013 10:13:12 +0200 Message-ID: <1358237598-32413-4-git-send-email-hdoyu@nvidia.com> X-Mailer: git-send-email 1.7.9.5 In-Reply-To: <1358237598-32413-1-git-send-email-hdoyu@nvidia.com> References: <1358237598-32413-1-git-send-email-hdoyu@nvidia.com> MIME-Version: 1.0 X-Bad-Reply: References and In-Reply-To but no 'Re:' in Subject. X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20130115_031359_258565_7294F9D7 X-CRM114-Status: GOOD ( 12.07 ) X-Spam-Score: -7.6 (-------) X-Spam-Report: SpamAssassin version 3.3.2 on merlin.infradead.org summary: Content analysis details: (-7.6 points) pts rule name description ---- ---------------------- -------------------------------------------------- -5.0 RCVD_IN_DNSWL_HI RBL: Sender listed at http://www.dnswl.org/, high trust [216.228.121.140 listed in list.dnswl.org] -0.0 SPF_HELO_PASS SPF: HELO matches SPF record -0.0 SPF_PASS SPF: sender matches SPF record -0.7 RP_MATCHES_RCVD Envelope sender domain matches handover relay domain -1.9 BAYES_00 BODY: Bayes spam probability is 0 to 1% [score: 0.0000] X-Mailman-Approved-At: Thu, 31 Jan 2013 07:54:31 -0500 Cc: lorenzo.pieralisi@arm.com, rob.herring@calxeda.com, linux-arm-kernel@lists.infradead.org, Hiroshi Doyu X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.14 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: linux-arm-kernel-bounces@lists.infradead.org Errors-To: linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org SCU based detection only works with Cortex-A9 MP and it doesn't support ones with multiple clusters. The only way to detect number of CPU core correctly is with DT /cpu node. Tegra SoCs decided to use DT detection as the only way and to not use SCU based detection at all. Even if DT /cpu node based detection fails, it continues with a single core Signed-off-by: Hiroshi Doyu --- Based on the discussion: http://lists.infradead.org/pipermail/linux-arm-kernel/2013-January/140608.html Signed-off-by: Hiroshi Doyu --- arch/arm/mach-tegra/platsmp.c | 15 --------------- 1 file changed, 15 deletions(-) diff --git a/arch/arm/mach-tegra/platsmp.c b/arch/arm/mach-tegra/platsmp.c index 6867030..689ee4b 100644 --- a/arch/arm/mach-tegra/platsmp.c +++ b/arch/arm/mach-tegra/platsmp.c @@ -177,23 +177,8 @@ done: return status; } -/* - * Initialise the CPU possible map early - this describes the CPUs - * which may be present or become present in the system. - */ static void __init tegra_smp_init_cpus(void) { - unsigned int i, ncores = scu_get_core_count(scu_base); - - if (ncores > nr_cpu_ids) { - pr_warn("SMP: %u cores greater than maximum (%u), clipping\n", - ncores, nr_cpu_ids); - ncores = nr_cpu_ids; - } - - for (i = 0; i < ncores; i++) - set_cpu_possible(i, true); - set_smp_cross_call(gic_raise_softirq); }