Interrupt Based Power State Management

摘要

A method and apparatus for power managed interrupt handling is disclosed. In one embodiment, a system includes one or more agents that may invoke an interrupt request. An interrupt controller is configured to receive and process the interrupt requests. When idle, the interrupt controller may be placed in a low power state. The system also includes an interrupt power control circuit coupled to receive interrupt request indications from each of the one or more agents that may invoke interrupts. The interrupt power control circuit is configured to assert a wakeup signal responsive to receiving an indication of an interrupt request from one of the agents. If the interrupt controller is in a low power state, it may exit the state and resume operation in an active state responsive to assertion of the wakeup signal.

主权项

1. An apparatus comprising:
one or more agents configured to assert respective interrupt requests; an interrupt controller configured to receive and process the interrupt requests, wherein the interrupt controller is configured to enter a low power state when inactive; an interrupt power controller coupled to receive interrupt request indications from each of the one or more agents, wherein the interrupt power controller is configured to assert a wakeup signal to the interrupt controller responsive to one of the one or more agents asserting an interrupt, wherein the interrupt controller is configured to exit the low power state responsive to receiving the wakeup signal.