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wxy 2017-03-06 12:51:46 +08:00
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published/20161018 Suspend to Idle.md
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@ -33,26 +33,26 @@ freeze mem
一旦设备正确实现了唤醒接口的调用，就可用来生成唤醒事件。请确保 DT 文件正确配置了唤醒源。下面是一个配置唤醒源示例，该文件来自（`arch/arm/boot/dst/am335x-evm.dts`）:
```
    gpio_keys: volume_keys@0 {__
               compatible = “gpio-keys”;
               #address-cells = <1>;
               #size-cells = <0>;
               autorepeat;
gpio_keys: volume_keys@0 {
compatible = “gpio-keys”;
#address-cells = <1>;
#size-cells = <0>;
autorepeat;
               switch@9 {
                       label = “volume-up”;
                       linux,code = <115>;
                       gpios = <&gpio0 2 GPIO_ACTIVE_LOW>;
                       wakeup-source;
               };
switch@9 {
label = “volume-up”;
linux,code = <115>;
gpios = <&gpio0 2 GPIO_ACTIVE_LOW>;
wakeup-source;
};
               switch@10 {
                       label = “volume-down”;
                       linux,code = <114>;
                       gpios = <&gpio0 3 GPIO_ACTIVE_LOW>;
                       wakeup-source;
               };
       };
switch@10 {
label = “volume-down”;
linux,code = <114>;
gpios = <&gpio0 3 GPIO_ACTIVE_LOW>;
wakeup-source;
};
};
```
如上所示，有两个 gpio 键被配置为唤醒源，在系统挂起期间，其中任何一个键被按下都会产生一个唤醒事件。
@ -94,24 +94,24 @@ freeze mem
```
/ # echo freeze > /sys/power/state
[  142.580832] PM: Syncing filesystems … done.
[  142.583977] Freezing user space processes … (elapsed 0.001 seconds) done.
[  142.591164] Double checking all user space processes after OOM killer disable… (elapsed 0.000 seconds)
[  142.600444] Freezing remaining freezable tasks … (elapsed 0.001 seconds) done._
_[  142.608073] Suspending console(s) (use no_console_suspend to debug)
[  142.708787] mmc1: Reset 0x1 never completed.
[  142.710608] msm_otg 78d9000.phy: USB in low power mode
[  142.711379] PM: suspend of devices complete after 102.883 msecs
[  142.712162] PM: late suspend of devices complete after 0.773 msecs
[  142.712607] PM: noirq suspend of devices complete after 0.438 msecs
[ 142.580832] PM: Syncing filesystems … done.
[ 142.583977] Freezing user space processes … (elapsed 0.001 seconds) done.
[ 142.591164] Double checking all user space processes after OOM killer disable… (elapsed 0.000 seconds)
[ 142.600444] Freezing remaining freezable tasks … (elapsed 0.001 seconds) done.
[ 142.608073] Suspending console(s) (use no_console_suspend to debug)
[ 142.708787] mmc1: Reset 0x1 never completed.
[ 142.710608] msm_otg 78d9000.phy: USB in low power mode
[ 142.711379] PM: suspend of devices complete after 102.883 msecs
[ 142.712162] PM: late suspend of devices complete after 0.773 msecs
[ 142.712607] PM: noirq suspend of devices complete after 0.438 msecs
< system suspended >
….
< wake irq triggered >
[  147.700522] PM: noirq resume of devices complete after 0.216 msecs
[  147.701004] PM: early resume of devices complete after 0.353 msecs
[  147.701636] msm_otg 78d9000.phy: USB exited from low power mode
[  147.704492] PM: resume of devices complete after 3.479 msecs
[  147.835599] Restarting tasks … done.
[ 147.700522] PM: noirq resume of devices complete after 0.216 msecs
[ 147.701004] PM: early resume of devices complete after 0.353 msecs
[ 147.701636] msm_otg 78d9000.phy: USB exited from low power mode
[ 147.704492] PM: resume of devices complete after 3.479 msecs
[ 147.835599] Restarting tasks … done.
/ #
```
@ -120,7 +120,7 @@ _[  142.608073] Suspending console(s) (use no_console_suspend to debug)
如果系统定义了冻结（freeze），那么系统将尝试挂起操作，如果没有冻结功能，那么你会看到下面的提示：
```
/ # echo freeze > /sys/power/state 
/ # echo freeze > /sys/power/state
sh: write error: Invalid argument
/ #
```