[Intel-gfx] [PATCH 01/12] drm/i915: Don't mark eDP encoders as MST capable

[Ville Syrjälä]

On Fri, Jun 17, 2016 at 06:35:33AM +1000, Dave Airlie wrote:
> On 8 June 2016 at 20:41,  <ville.syrjala at linux.intel.com> wrote:
> > From: Ville Syrjälä <ville.syrjala at linux.intel.com>
> >
> > If we've determined that the encoder is eDP, we shouldn't try to use MST
> > on it. Or at least the code doesn't seem to expect that since there are
> > some type==DP checks in the MST code.
> >
> > Cc: Dave Airlie <airlied at redhat.com>
> > Signed-off-by: Ville Syrjälä <ville.syrjala at linux.intel.com>
> 
> How sure are we that MST eDP panels won't show up in the future?

No clue really. The only reference to MST in the eDP spec is the
explanation of the acronym.

I did spot that there's this thing called multi-SST mode, where you feed
the panel with several SST links. But that's sort of the opposite of
MST.

> 
> Like the code could be buggy now, but breaking it completely is different.

Should be easy for someone familiar with the MST code to fix if eDP+MST
ever makes an appearance; Just revert this patch, and deal with any
fallout.

> 
> I've no insight into future eDP panel development.
> 
> Dave.

-- 
Ville Syrjälä
Intel OTC