[PATCHv4 3/3] ARM: mx51: Add support for low power suspend on MX51
Nguyen Dinh-R00091
R00091 at freescale.com
Mon Mar 21 10:53:21 EDT 2011
Hi Russell,
>-----Original Message-----
>From: linux-kernel-owner at vger.kernel.org [mailto:linux-kernel-owner at vger.kernel.org] On Behalf Of
>Russell King - ARM Linux
>Sent: Friday, March 18, 2011 10:25 AM
>To: Nguyen Dinh-R00091
>Cc: linux-kernel at vger.kernel.org; linux-arm-kernel at lists.infradead.org; s.hauer at pengutronix.de;
>u.kleine-koenig at pengutronix.de; arnaud.patard at rtp-net.org; Vaidyanathan Ranjani-RA5478; Zhang Lily-
>R58066; festevam at gmail.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 at freescale.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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