[PATCH 0/5] Initial DisplayPort OUI probing

[Adam Jackson <ajax@redhat.com>]

DisplayPort has an escape hatch by which devices can identify each other.
I'm not super thrilled that it does, since that's just a clever way of
getting the spec to explicitly bless interoperability bugs.  But it may
be useful information when debugging link training problems, and there's
a cute trick you can do on iMacs that I think will require knowing this
information, so we may as well fill it in.

Tested on a Lenovo T500 against a DP->VGA adaptor (which turns out to be
an ST Microelectronics chip, who knew) and an HP LP2480zx (which does
not advertise OUI support, but also harmlessly returns 0s for the OUI
registers if you read them anyway).

- ajax