On Tue, 2004-11-02 at 16:00 -0500, Alan Stern wrote: > On Tue, 2 Nov 2004, Pavel Machek wrote: > > > Event codes are: > > > > ON - no need to do anything except special cases like broken hw > > FREEZE - stop dma and interrupts, and be prepared to reinit hw from scratch > > SUSPEND - like FREEZE, but also put hardware into low-power state > > Presumably SUSPEND includes FREEZE. What then about wakeup IRQs? Clearly > they need to be enabled on wakeup-capable devices when the system is > suspended. Should they be enabled during a FREEZE? The fact that SUSPEND > includes FREEZE argues that it should be legal to enable wakeup interrupts > during FREEZE. That is totally orthogonal, but FREEZE doesn't imply a system low power state, so there should be no need for enabling wakeup events. FREEZE is used for snapshotting the system memory image, and for APM & kexec. APM is totally under BIOS control and kexec doesn't require wakeup events. I think wakeup events are only needed for STANDBY and SUSPEND Ben.
