linux-kernel - RE: [PATCHv4 3/3] ARM: mx51: Add support for low power suspend on MX51

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Date:	Mon, 21 Mar 2011 14:53:21 +0000
From:	Nguyen Dinh-R00091 <R00091@...escale.com>
To:	Russell King - ARM Linux <linux@....linux.org.uk>
CC:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"s.hauer@...gutronix.de" <s.hauer@...gutronix.de>,
	"u.kleine-koenig@...gutronix.de" <u.kleine-koenig@...gutronix.de>,
	"arnaud.patard@...-net.org" <arnaud.patard@...-net.org>,
	Vaidyanathan Ranjani-RA5478 <RA5478@...escale.com>,
	Zhang Lily-R58066 <R58066@...escale.com>,
	"festevam@...il.com" <festevam@...il.com>
Subject: RE: [PATCHv4 3/3] ARM: mx51: Add support for low power suspend on
	MX51

Hi Russell,

>-----Original Message-----
>From: linux-kernel-owner@...r.kernel.org [mailto:linux-kernel-owner@...r.kernel.org] On Behalf Of
>Russell King - ARM Linux
>Sent: Friday, March 18, 2011 10:25 AM
>To: Nguyen Dinh-R00091
>Cc: linux-kernel@...r.kernel.org; linux-arm-kernel@...ts.infradead.org; s.hauer@...gutronix.de;
>u.kleine-koenig@...gutronix.de; arnaud.patard@...-net.org; Vaidyanathan Ranjani-RA5478; Zhang Lily-
>R58066; festevam@...il.com
>Subject: Re: [PATCHv4 3/3] ARM: mx51: Add support for low power suspend on MX51
>
>On Fri, Mar 18, 2011 at 10:21:24AM -0500, Dinh.Nguyen@...escale.com wrote:
>> +#include <linux/suspend.h>
>> +#include <linux/clk.h>
>> +#include <asm/mach/map.h>
>> +#include <asm/cacheflush.h>
>> +#include <asm/tlb.h>
>> +#include <mach/system.h>
>> +#include "crm_regs.h"
>
>Why does the code below require asm/mach/map.h ?

map.h can be replaced by linux/io.h for the __raw_writel().

>Why does it require asm/tlb.h ?

asm/tlb is for the local_flush_tlb_all() call.

Thanks for your review.

Dinh
>
>> +
>> +static 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");
>> +
>> +	if (gpc_dvfs_clk) {
>> +		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);
>> +	}else {
>> +		printk(KERN_ERR "Cannot enter SRPG suspend -no gpc_dvfs clock!\n");
>> +		return -EPERM;
>> +	}
>> +
>> +	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
>>
>>
>--
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