some minor dal cleanups and example of future patches

[Dave Airlie]

On 13 December 2016 at 16:41, Dave Airlie <airlied at gmail.com> wrote:
> So whenever I look at DAL I find myself trying to figure out what
> all of it does, and this leads me to deleting things, so I'm just
> sending out some stuff that I cleaned today.
>
> One thing I noticed in passing is the displayport code seems
> possibly endian unsafe, it casts bytes read from hardware into
> bitfields, this is the best defined behaviour and is generally
> a pattern we try to steer away from.
>
> The porting the displayport code to use drm defines is the
> sort of example of a cleanup patch that might cause problems
> for you in code sharing, but is the exact sort of patch that
> has been applied to other drivers in the past.

I've also just noticed every dpcd access (read/write) causes
a traversal of the connector list.

Dave.