From mboxrd@z Thu Jan 1 00:00:00 1970 From: s.hauer@pengutronix.de (Sascha Hauer) Date: Thu, 17 Mar 2011 09:21:06 +0100 Subject: [PATCHv3 3/3] ARM: mx51: Add support for low power suspend on MX51 In-Reply-To: <1300305787-7970-3-git-send-email-Dinh.Nguyen@freescale.com> References: <1300305787-7970-1-git-send-email-Dinh.Nguyen@freescale.com> <1300305787-7970-2-git-send-email-Dinh.Nguyen@freescale.com> <1300305787-7970-3-git-send-email-Dinh.Nguyen@freescale.com> Message-ID: <20110317082106.GT29521@pengutronix.de> To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org On Wed, Mar 16, 2011 at 03:03:07PM -0500, Dinh.Nguyen at freescale.com wrote: > + > +struct clk *gpc_dvfs_clk; > + > +static int mx5_suspend_enter(suspend_state_t state) > +{ > + if (gpc_dvfs_clk == NULL) > + gpc_dvfs_clk = clk_get(NULL, "gpc_dvfs_clk"); clk_get can fail and NULL can be a valid clock. Sascha > + > + 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 (cpu_is_mx51()) > + suspend_set_ops(&mx5_suspend_ops); > + > + return 0; > +} > +device_initcall(mx5_pm_init); > -- > 1.6.0.4 > > > -- 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 |