usb: typec: altmodes/displayport: Fall back to multi-func pins

[Heikki Krogerus <heikki.krogerus@linux.intel.com>]

On Mon, Feb 25, 2019 at 07:50:32PM +0100, Hans de Goede wrote:
> Hi Heikki,
> 
> On 25-02-19 16:49, Heikki Krogerus wrote:
> > On Mon, Feb 25, 2019 at 01:56:37PM +0100, Hans de Goede wrote:
> > > If our port-partner supports both DP-only operation (pin-assignment C)
> > > and multi-func operation (pin-assignment D) and we only support
> > > pin-assignment D and the port-partner prefers DP-only mode, then
> > > before this commit we would and up masking out pin-assignment D from
> > > the available pin-assignments and fail to pick a pin-assignment.
> > > 
> > > Instead only mask out the multi-func pin-assignments if we support
> > > dp-only pin-assignments, so that we correctly fall-back to a multi-func
> > > pin-assignment in this case (by picking pin-assignment D).
> > > 
> > > Signed-off-by: Hans de Goede <hdegoede@redhat.com>
> > 
> > Should this be handled as a fix?
> 
> AFAIK they are no users if this yet, until we've agreement
> on the DT bindings and code merged for adding alt-modes
> to an usb-connector node, nothing will be using this code,
> so I see little use in adding a Cc: stable or some such.

True.

thanks,