[U-Boot] [PATCH 0/7] Add a better USB keyboard polling method

[Hans de Goede]

Hi Marek,

This time a patch-set for next :)

Currently one can choose between 2 poll methods for usb keyboards, both of
which are suboptimal. One option is to use control messages to get reports,
which some devices (e.g. my kvm) do not like. The other option is to use
interrupt urbs, but usb_submit_int_msg waits for the interrupt packet to
show up, meaning that each poll takes 40 ms, slowing anything else down
tremendously.

This patch-sets adds a third method (only usable with ehci for now), which
makes use of the int_queue concept in the ehci code. This allows us to submit
an interrupt message, and then poll for the actual completion of this message
giving us much lower latency then even the control message method (effectively
this gives us 0 latency), while using standard interrupt messages which seems
to keep keyboards much happier.

Regards,

Hans