Unrelenting testplan D25219

[Hans Petter Selasky]

On 2020-06-12 19:35, Ian Lepore wrote:
> If the xhci controller's view of memory is limited to certain ranges,
> then that should be reflected in the dmatag set up by its bus parent
> who knows the range restrictions.  Nothing would need to change in the
> xhci driver itself (assuming xhci uses bus_get_dma_tag() like it should
> when creating its own tag(s)).

Exactly! We currently only have a bits value, so that you can set the 
number of bits supported. For example < 2GB.

I think this should suffice.

--HPS