As your P-6 is USB class compliant, it does not need a driver to connect to your computer. However, in some cases, your DAW may not recognize your P-6. A simple solution involves disabling AIRA LINK.
AIRA LINK is associated with the AIRA LINK Terminal on the MX-1: MX-1: What kind of devices can be connected to the AIRA LINK terminal (USB input) of the MX-1?
To switch AIRA LINK off, please see "Connecting to a computer or mobile device" in the P-6 Owner's Manual.