Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755200Ab1C3I2E (ORCPT ); Wed, 30 Mar 2011 04:28:04 -0400 Received: from metis.ext.pengutronix.de ([92.198.50.35]:41217 "EHLO metis.ext.pengutronix.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753543Ab1C3I2A (ORCPT ); Wed, 30 Mar 2011 04:28:00 -0400 Date: Wed, 30 Mar 2011 10:27:58 +0200 From: Sascha Hauer To: Dinh.Nguyen@freescale.com Cc: linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux@arm.linux.org.uk, u.kleine-koenig@pengutronix.de, arnaud.patard@rtp-net.org, ra5478@freescale.com, xiao-lizhang@freescale.com, festevam@gmail.com Subject: Re: [PATCHv7] ARM: mx51: Add support for low power suspend on MX51 Message-ID: <20110330082758.GT7285@pengutronix.de> References: <1301325297-24126-1-git-send-email-Dinh.Nguyen@freescale.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <1301325297-24126-1-git-send-email-Dinh.Nguyen@freescale.com> X-Sent-From: Pengutronix Hildesheim X-URL: http://www.pengutronix.de/ X-IRC: #ptxdist @freenode X-Accept-Language: de,en X-Accept-Content-Type: text/plain X-Uptime: 10:20:18 up 5 days, 21:39, 43 users, load average: 0.47, 0.41, 0.43 User-Agent: Mutt/1.5.20 (2009-06-14) X-SA-Exim-Connect-IP: 2001:6f8:1178:2:215:17ff:fe12:23b0 X-SA-Exim-Mail-From: sha@pengutronix.de X-SA-Exim-Scanned: No (on metis.ext.pengutronix.de); SAEximRunCond expanded to false X-PTX-Original-Recipient: linux-kernel@vger.kernel.org Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 3765 Lines: 119 On Mon, Mar 28, 2011 at 10:14:57AM -0500, Dinh.Nguyen@freescale.com wrote: > From: Dinh Nguyen > > Adds initial low power suspend functionality to MX51. > Supports "mem" and "standby" modes. > > Tested on mx51-babbage. > > Signed-off-by: Dinh Nguyen > --- > arch/arm/mach-mx5/Makefile | 1 + > arch/arm/mach-mx5/pm-imx5.c | 73 +++++++++++++++++++++++++++++++++++++++++++ > 2 files changed, 74 insertions(+), 0 deletions(-) > create mode 100644 arch/arm/mach-mx5/pm-imx5.c > > diff --git a/arch/arm/mach-mx5/Makefile b/arch/arm/mach-mx5/Makefile > index 0b9338c..d646feb 100644 > --- a/arch/arm/mach-mx5/Makefile > +++ b/arch/arm/mach-mx5/Makefile > @@ -6,6 +6,7 @@ > obj-y := cpu.o mm.o clock-mx51-mx53.o devices.o ehci.o system.o > obj-$(CONFIG_SOC_IMX50) += mm-mx50.o > > +obj-$(CONFIG_PM) += pm-imx5.o > obj-$(CONFIG_CPU_FREQ_IMX) += cpu_op-mx51.o > obj-$(CONFIG_MACH_MX51_BABBAGE) += board-mx51_babbage.o > obj-$(CONFIG_MACH_MX51_3DS) += board-mx51_3ds.o > diff --git a/arch/arm/mach-mx5/pm-imx5.c b/arch/arm/mach-mx5/pm-imx5.c > new file mode 100644 > index 0000000..e4529af > --- /dev/null > +++ b/arch/arm/mach-mx5/pm-imx5.c > @@ -0,0 +1,73 @@ > +/* > + * Copyright (C) 2011 Freescale Semiconductor, Inc. All Rights Reserved. > + * > + * The code contained herein is licensed under the GNU General Public > + * License. You may obtain a copy of the GNU General Public License > + * Version 2 or later at the following locations: > + * > + * http://www.opensource.org/licenses/gpl-license.html > + * http://www.gnu.org/copyleft/gpl.html > + */ > +#include > +#include > +#include > +#include > +#include > +#include > +#include > +#include "crm_regs.h" > + > +static struct clk *gpc_dvfs_clk; > + > +static int mx5_suspend_enter(suspend_state_t state) > +{ > + clk_enable(gpc_dvfs_clk); > + switch (state) { > + case PM_SUSPEND_MEM: > + mx5_cpu_lp_set(STOP_POWER_OFF); > + break; > + case PM_SUSPEND_STANDBY: > + mx5_cpu_lp_set(WAIT_UNCLOCKED_POWER_OFF); > + break; > + default: > + return -EINVAL; > + } > + > + if (state == PM_SUSPEND_MEM) { > + local_flush_tlb_all(); > + flush_cache_all(); > + > + /*clear the EMPGC0/1 bits */ > + __raw_writel(0, MXC_SRPG_EMPGC0_SRPGCR); > + __raw_writel(0, MXC_SRPG_EMPGC1_SRPGCR); > + } > + cpu_do_idle(); > + clk_disable(gpc_dvfs_clk); > + > + return 0; > +} > + > +static int mx5_pm_valid(suspend_state_t state) > +{ > + return (state > PM_SUSPEND_ON && state <= PM_SUSPEND_MAX); > +} > + > +static const struct platform_suspend_ops mx5_suspend_ops = { > + .valid = mx5_pm_valid, > + .enter = mx5_suspend_enter, > +}; > + > +static int __init mx5_pm_init(void) > +{ > + if (gpc_dvfs_clk == NULL) > + gpc_dvfs_clk = clk_get(NULL, "gpc_dvfs"); This is only executed once, so gpc_dvfs_clk is always NULL here. > + > + if (!IS_ERR(gpc_dvfs_clk)) { > + if (cpu_is_mx51()) > + suspend_set_ops(&mx5_suspend_ops); This code shall only be executed on an i.MX51, so why don't you make a simple if (!cpu_is_mx51()) return 0; at the beginning of this function? Sascha -- Pengutronix e.K. | | Industrial Linux Solutions | http://www.pengutronix.de/ | Peiner Str. 6-8, 31137 Hildesheim, Germany | Phone: +49-5121-206917-0 | Amtsgericht Hildesheim, HRA 2686 | Fax: +49-5121-206917-5555 | -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/