<span>sys_sync</span>
suspend_prepare
suspend_devices_and_enter
suspend_finish
1. pm_prepare_console<br>2. pm_notifier_call_chain<br>3. <font color="#00a650">suspend_freeze_processes</font><br>
1. freeze_processes<br>2. freeze_kernel_threads<br>
suspend_ops->begin(state)
dpm_suspend_start(PMSG_SUSPEND);
suspend_console
suspend_enter
dpm_prepare
dpm_suspend
device prepare
device suspend
suspend_ops->prepare
dpm_suspend_end
suspend_ops->prepare_late
disable_nonboot_cpus
arch_suspend_disable_irqs
syscore_suspend
device suspend_late
device suspend_noirq
suspend_ops->enter(state)
<span>imx6q_pm_enter</span>
<font color="#c41230">syscore_resume<br>arch_suspend_enable_irqs<br>enable_nonboot_cpus<br>suspend_ops->wake<br>dpm_resume_start<br>suspend_ops->finish</font><br>
write to<br>/sys/power/state
freeze process and thread
suspend device
suspend CPU & irq
suspend ....
enable CPU & irq
resume device
resume process & thread
back to the behind of write
