Short description of the changes:
- attempt to retry some commands for which it is possible (read, query)
- always make a short sleep before checking EC status in polled mode
- periodically poll EC status in interrupt mode
- change logic for detecting broken interrupt delivery and falling back
to polled mode
- check that EC is ready for input before starting a new command, wait
if necessary
This commit is based on the original patch by David Naylor.
PR: kern/150517
Submitted by: David Naylor <naylor.b.david@gmail.com>
Reviewed by: jkim
MFC after: 3 weeks
5ff14fa9b4