[Bug 108070] [CI][BAT] igt at . - dmesg-warn - WARN_ON(intel_wait_for_register(dev_priv, regs->driver, (0x1 << ((pw_idx) * 2)), (0x1 << ((pw_idx) * 2)), 1))

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=108070

--- Comment #19 from Martin Peres <martin.peres at free.fr> ---
(In reply to Imre Deak from comment #18)
> Different bug with the same error message.(In reply to Martin Peres from
> comment #17)
> > (In reply to Imre Deak from comment #16)
> > > Fix merged:
> > > 
> > > commit 602438ead302aaa844899db5214b489d0d93fe18
> > > Author: Imre Deak <imre.deak at intel.com>
> > > Date:   Tue Nov 6 18:06:21 2018 +0200
> > > 
> > >     drm/i915/icl: Fix port B combo PHY context loss after DC transitions
> > 
> > Thanks, this really helped!
> 
> Yep, I think different bug leading to the same error message.
> 
> This one is due to our modeset vs. TC port connected state tracking being
> broken, a known issue. The test generates an HPD disconnect interrupt on the
> HDMI output during suspend and so we run the TypeC disconnect sequence, but
> there is no time for userspace/kernel console to react doing a modeset to
> disable the output. Then after resume we try to restore the output but since
> the port is in a disconnected state that will fail, leading to the timeout
> during powerwell enabling.
> 
> So in general HPD on ICL type C ports is broken or not implemented yet,
> depending on how you want to look at it.

Awesome comment! Thanks for stating it so clearly!

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