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SubjectRe: [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@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 ?
Why does it require asm/tlb.h ?

> +
> +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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