- 根目录:
- arch
- arm
- mach-imx
- cpuidle-imx6q.c
#include <linux/cpuidle.h>
#include <linux/module.h>
#include <asm/cpuidle.h>
#include <asm/proc-fns.h>
#include "common.h"
#include "cpuidle.h"
static atomic_t master = ATOMIC_INIT(0);
static DEFINE_SPINLOCK(master_lock);
static int imx6q_enter_wait(struct cpuidle_device *dev,
struct cpuidle_driver *drv, int index)
{
if (atomic_inc_return(&master) == num_online_cpus()) {
if (!spin_trylock(&master_lock))
goto idle;
imx6q_set_lpm(WAIT_UNCLOCKED);
cpu_do_idle();
imx6q_set_lpm(WAIT_CLOCKED);
spin_unlock(&master_lock);
goto done;
}
idle:
cpu_do_idle();
done:
atomic_dec(&master);
return index;
}
static struct cpuidle_driver imx6q_cpuidle_driver = {
.name = "imx6q_cpuidle",
.owner = THIS_MODULE,
.states = {
ARM_CPUIDLE_WFI_STATE,
{
.exit_latency = 50,
.target_residency = 75,
.flags = CPUIDLE_FLAG_TIME_VALID |
CPUIDLE_FLAG_TIMER_STOP,
.enter = imx6q_enter_wait,
.name = "WAIT",
.desc = "Clock off",
},
},
.state_count = 2,
.safe_state_index = 0,
};
int __init imx6q_cpuidle_init(void)
{
imx_scu_standby_enable();
imx6q_set_chicken_bit();
return cpuidle_register(&imx6q_cpuidle_driver, NULL);
}
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