From patchwork Mon Jul 7 14:51:37 2014 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Thomas Petazzoni X-Patchwork-Id: 4495461 Return-Path: X-Original-To: patchwork-linux-pm@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 C708C9F1C4 for ; Mon, 7 Jul 2014 14:51:56 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id 0928820328 for ; Mon, 7 Jul 2014 14:51:56 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 2F19C202E6 for ; Mon, 7 Jul 2014 14:51:55 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753443AbaGGOvv (ORCPT ); Mon, 7 Jul 2014 10:51:51 -0400 Received: from top.free-electrons.com ([176.31.233.9]:57795 "EHLO mail.free-electrons.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1753502AbaGGOvt (ORCPT ); Mon, 7 Jul 2014 10:51:49 -0400 Received: by mail.free-electrons.com (Postfix, from userid 106) id 81C6A15E7; Mon, 7 Jul 2014 16:51:49 +0200 (CEST) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on mail.kernel.org X-Spam-Level: X-Spam-Status: No, score=-7.6 required=5.0 tests=BAYES_00, RCVD_IN_DNSWL_HI, RP_MATCHES_RCVD, UNPARSEABLE_RELAY autolearn=ham version=3.3.1 Received: from localhost (col31-4-88-188-83-94.fbx.proxad.net [88.188.83.94]) by mail.free-electrons.com (Postfix) with ESMTPSA id 27D652309; Mon, 7 Jul 2014 16:51:49 +0200 (CEST) From: Thomas Petazzoni To: Mike Turquette , Viresh Kumar , "Rafael J. Wysocki" , Jason Cooper , Andrew Lunn , Sebastian Hesselbarth , Gregory Clement Cc: linux-pm@vger.kernel.org, linux-arm-kernel@lists.infradead.org, Tawfik Bayouk , Nadav Haklai , Lior Amsalem , Ezequiel Garcia , Thomas Petazzoni Subject: [PATCHv2 3/8] ARM: mvebu: ensure CPU clocks are enabled Date: Mon, 7 Jul 2014 16:51:37 +0200 Message-Id: <1404744702-32010-4-git-send-email-thomas.petazzoni@free-electrons.com> X-Mailer: git-send-email 2.0.0 In-Reply-To: <1404744702-32010-1-git-send-email-thomas.petazzoni@free-electrons.com> References: <1404744702-32010-1-git-send-email-thomas.petazzoni@free-electrons.com> Sender: linux-pm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-pm@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP In the Armada XP SMP support code, we are reading the clock frequency of the booting CPU, and use that to assign the same frequency to the other CPUs, and we do this while the clocks are disabled. However, the CPU clocks are in fact never prepared/enabled, and to support cpufreq, we now have two code paths to change the frequency of the CPU clocks in the CPU clock driver: one when the clock is enabled (dynamic frequency scaling), one when the clock is disabled (adjusting the CPU frequency before starting the CPU). In order for this to work, the CPU clocks now have to be prepared and enabled after the initial synchronization of the clock frequencies is done, so that all future rate changes of the CPU clocks will trigger a dynamic frequency scaling transition. Signed-off-by: Thomas Petazzoni --- arch/arm/mach-mvebu/platsmp.c | 1 + 1 file changed, 1 insertion(+) diff --git a/arch/arm/mach-mvebu/platsmp.c b/arch/arm/mach-mvebu/platsmp.c index 88b976b3..4880b0f 100644 --- a/arch/arm/mach-mvebu/platsmp.c +++ b/arch/arm/mach-mvebu/platsmp.c @@ -67,6 +67,7 @@ static void __init set_secondary_cpus_clock(void) if (!cpu_clk) return; clk_set_rate(cpu_clk, rate); + clk_prepare_enable(cpu_clk); } }