From patchwork Wed May 14 08:03:57 2014 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Chander Kashyap X-Patchwork-Id: 4173431 Return-Path: X-Original-To: patchwork-linux-samsung-soc@patchwork.kernel.org Delivered-To: patchwork-parsemail@patchwork1.web.kernel.org Received: from mail.kernel.org (mail.kernel.org [198.145.19.201]) by patchwork1.web.kernel.org (Postfix) with ESMTP id 837FD9F3AE for ; Wed, 14 May 2014 08:05:15 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id 9FD9D2035C for ; Wed, 14 May 2014 08:05:14 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id CF4D52034E for ; Wed, 14 May 2014 08:05:13 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752646AbaENIEs (ORCPT ); Wed, 14 May 2014 04:04:48 -0400 Received: from mail-pb0-f48.google.com ([209.85.160.48]:48239 "EHLO mail-pb0-f48.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752657AbaENIEn (ORCPT ); Wed, 14 May 2014 04:04:43 -0400 Received: by mail-pb0-f48.google.com with SMTP id rr13so1389322pbb.35 for ; Wed, 14 May 2014 01:04:43 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20130820; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references; bh=joAL16JqQetSYBaXn8fgobKGIob/ojuQ9fsGNeDbm9E=; b=YA35U5viHq5vgxysP8elSPBnznqIU5bi7WLBVt6XwxQlxWz39Zm+gf5o+ZpAFYhjij cgBdBROV0X/p3z8evbF4Chq2Egd3c7XZqgoL+H5J6ER10URskU90wT+1DORZws09Qkiu wTZp74Dz6bq4n9YAwiCAxS46WtaNLbWigEjJfHy58uA7yT0zNLoDOS0XMBCtNfFQsto1 oSDePi7W72LWiirriX10Hu7tcCR6bEouUkFl/oI+w7xfFwO+M0LviaiB2wTGMqBBqX9J 0zCWyLgqNgi9nkMhIFSfQ//FU7ofxXmkN2ojF2YnFKX7Bctc5rRxo45tjuzZ8Clnqqw2 0T5Q== X-Gm-Message-State: ALoCoQlkqk8owzkLPQ3BlbPShwBcz0F6j45mcNUeo/8aHcTOyYlxboRV0fDAPuJ5VbDASzLTca1e X-Received: by 10.66.164.70 with SMTP id yo6mr2446367pab.85.1400054683116; Wed, 14 May 2014 01:04:43 -0700 (PDT) Received: from localhost.localdomain ([14.140.216.146]) by mx.google.com with ESMTPSA id as12sm4807422pac.43.2014.05.14.01.04.37 for (version=TLSv1.1 cipher=ECDHE-RSA-RC4-SHA bits=128/128); Wed, 14 May 2014 01:04:41 -0700 (PDT) From: Chander Kashyap To: linux-pm@vger.kernel.org, linux-kernel@vger.kernel.org, linux-samsung-soc@vger.kernel.org, linux-arm-kernel@lists.infradead.org Cc: daniel.lezcano@linaro.org, lorenzo.pieralisi@arm.com, rjw@rjwysocki.net, kgene.kim@samsung.com, Chander Kashyap , Chander Kashyap Subject: [PATCH v5 6/6] mcpm: exynos: populate suspend and powered_up callbacks Date: Wed, 14 May 2014 13:33:57 +0530 Message-Id: <1400054637-21505-7-git-send-email-chander.kashyap@linaro.org> X-Mailer: git-send-email 1.7.9.5 In-Reply-To: <1400054637-21505-1-git-send-email-chander.kashyap@linaro.org> References: <1400054637-21505-1-git-send-email-chander.kashyap@linaro.org> Sender: linux-samsung-soc-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-samsung-soc@vger.kernel.org X-Spam-Status: No, score=-7.5 required=5.0 tests=BAYES_00, RCVD_IN_DNSWL_HI, 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 order to support cpuidle through mcpm, suspend and powered-up callbacks are required in mcpm platform code. Hence populate the same callbacks. Signed-off-by: Chander Kashyap Signed-off-by: Chander Kashyap --- Changes in v5: 1. Add comment to address cache access while c-bit is cleared in SCLTR 2. Make exynos_powered_up static Changes in v4: None Changes in v3: 1. Removed coherency enablement after suspend failure. 2. Use generic function to poweron cpu. changes in v2: 1. Fixed typo: enynos_pmu_cpunr to exynos_pmu_cpunr arch/arm/mach-exynos/mcpm-exynos.c | 34 ++++++++++++++++++++++++++++++++++ 1 file changed, 34 insertions(+) diff --git a/arch/arm/mach-exynos/mcpm-exynos.c b/arch/arm/mach-exynos/mcpm-exynos.c index c6bb3a4..623dfa7 100644 --- a/arch/arm/mach-exynos/mcpm-exynos.c +++ b/arch/arm/mach-exynos/mcpm-exynos.c @@ -253,10 +253,46 @@ static int exynos_power_down_finish(unsigned int cpu, unsigned int cluster) return -ETIMEDOUT; /* timeout */ } +static void exynos_powered_up(void) +{ + unsigned int mpidr, cpu, cluster; + + mpidr = read_cpuid_mpidr(); + cpu = MPIDR_AFFINITY_LEVEL(mpidr, 0); + cluster = MPIDR_AFFINITY_LEVEL(mpidr, 1); + + arch_spin_lock(&exynos_mcpm_lock); + if (cpu_use_count[cpu][cluster] == 0) + cpu_use_count[cpu][cluster] = 1; + arch_spin_unlock(&exynos_mcpm_lock); +} + +static void exynos_suspend(u64 residency) +{ + unsigned int mpidr, cpunr; + + exynos_power_down(); + + /* + * Execution reaches here only if cpu did not power down. + * Hence roll back the changes done in exynos_power_down function. + * + * CAUTION: "This function requires the stack data to be visible through + * power down and can only be executed on processors like A15 and A7 + * that hit the cache with the C bit clear in the SCTLR register." + */ + mpidr = read_cpuid_mpidr(); + cpunr = exynos_pmu_cpunr(mpidr); + + exynos_cpu_power_up(cpunr); +} + static const struct mcpm_platform_ops exynos_power_ops = { .power_up = exynos_power_up, .power_down = exynos_power_down, .power_down_finish = exynos_power_down_finish, + .suspend = exynos_suspend, + .powered_up = exynos_powered_up, }; static void __init exynos_mcpm_usage_count_init(void)