Archipelago » qemu

ehci: Lower timer freq when the periodic schedule is idle

Lower the timer freq if no iso schedule packets complete for 64 frames in
a row.

We can safely do this, without adding latency, because:
1) If there is isoc traffic this will never trigger
2) For async handled interrupt packets (only usb-host), the completion handler...

usb/ehci: split into multiple source files

Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>