Added by Android to kernel: Early suspend, late resume

Early suspend, late resumeearly suspend and late resume are a feature that android has added to the base region of the standard Linux. When the user asks for a request to enter the suspend, the user enters the early suspend reply function first. The animation program can call back the early suspend function, when the incoming calls are made, the inner core uses these call records one by one. For example, an alert trigger usually checks early suspend. In its call back function, the alert trigger will turn off both the screen and the backlight. In this category, all the subsequent progress is still in progress. the playing of the song should be in the lower part of the news, it's just a poor screen display. After early suspend authentication, once all the power grids (wake locks) are released, the system will immediately enter the real suspend process, wait until the last system stops working and wait for the external events to wake up.