From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755143AbaCDQWe (ORCPT ); Tue, 4 Mar 2014 11:22:34 -0500 Received: from top.free-electrons.com ([176.31.233.9]:41935 "EHLO mail.free-electrons.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1754571AbaCDQUl (ORCPT ); Tue, 4 Mar 2014 11:20:41 -0500 From: Maxime Ripard To: Emilio Lopez , Dan Williams , Vinod Koul Cc: Mike Turquette , linux-arm-kernel@lists.infradead.org, dmaengine@vger.kernel.org, linux-kernel@vger.kernel.org, devicetree@vger.kernel.org, linux-sunxi@googlegroups.com, kevin.z.m.zh@gmail.com, sunny@allwinnertech.com, shuge@allwinnertech.com, zhuzhenhua@allwinnertech.com, andriy.shevchenko@intel.com, Maxime Ripard Subject: [PATCH v3 4/7] ARM: sun6i: Protect CPU clock Date: Tue, 4 Mar 2014 17:18:01 +0100 Message-Id: <1393949884-892-5-git-send-email-maxime.ripard@free-electrons.com> X-Mailer: git-send-email 1.9.0 In-Reply-To: <1393949884-892-1-git-send-email-maxime.ripard@free-electrons.com> References: <1393949884-892-1-git-send-email-maxime.ripard@free-electrons.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Right now, AHB is an indirect child clock of the CPU clock. If that happens to change, since the CPU clock has no other consumers declared in Linux, it would be shut down, which is not really a good idea. Prevent this by forcing it enabled. Signed-off-by: Maxime Ripard --- arch/arm/mach-sunxi/sun6i.c | 9 +++++++++ 1 file changed, 9 insertions(+) diff --git a/arch/arm/mach-sunxi/sun6i.c b/arch/arm/mach-sunxi/sun6i.c index c5dc819..6b39055 100644 --- a/arch/arm/mach-sunxi/sun6i.c +++ b/arch/arm/mach-sunxi/sun6i.c @@ -10,6 +10,7 @@ * warranty of any kind, whether express or implied. */ +#include #include #include #include @@ -22,9 +23,17 @@ static void __init sun6i_dt_init(void) { + struct clk *clk; + sunxi_setup_restart(); of_platform_populate(NULL, of_default_bus_match_table, NULL, NULL); + + /* Make sure the clocks we absolutely need are enabled */ + /* CPU clock */ + clk = clk_get(NULL, "cpu"); + if (!IS_ERR(clk)) + clk_prepare_enable(clk); } extern void __init sun6i_reset_init(void); -- 1.9.0