[Intel-gfx] [PATCH 6/6] drm/i915/bxt: Fix irq_port for eDP

[Daniel Vetter]

On Thu, Sep 10, 2015 at 04:35:57PM +0300, Ville Syrjälä wrote:
> On Thu, Sep 10, 2015 at 01:07:30PM +0000, R, Durgadoss wrote:
> > Hi Rodrigo,
> > 
> > I had to add this to get HDMI hotplug working on BXT.
> > As you might already know, we have the HPD pins A & B
> > swapped in BXT. And, we are using HPD_PORT_A as
> > 'intel_encoder->hpd_pin' for HDMI on port B.
> 
> People keep saying that, but according to the spec it's not
> even true. A and B are not swapped, but instead all the pins
> are sort of shifted by one position.
> 
> HPD A = DDI0 / port B
> HPD B = DDI1 / port C
> HPD C = DDI2 / port A
> 
> If the code actually did the remapping in a way that matches
> the spec, things would be a lot less confusing.

And we even have the logic to allow that remapping, so I guess the real
job is to figure out where that's not done correctly. Not throwing more
hacks on top.
-Daniel
-- 
Daniel Vetter
Software Engineer, Intel Corporation
http://blog.ffwll.ch