[Bug 90963] i915:No display with Display port [drm:intel_dp_start_link_train] *ERROR* too many full retries, give up

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=90963

Ander Conselvan de Oliveira <conselvan2 at gmail.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |airlied at freedesktop.org,
                   |                            |ville.syrjala at linux.intel.c
                   |                            |om
      i915 features|display/DP                  |display/DP MST

--- Comment #12 from Ander Conselvan de Oliveira <conselvan2 at gmail.com> ---
(In reply to Eong Chen from comment #11)
> Created attachment 118986 [details]
> full dmesg with Ander Conselvan's patch
> 
> Tried the patch on 4.2.3.

Unfortunately that didn't help. It seems we reach the maximum voltage level and
the monitor still doesn't reach clock recovery. 

I see in the log that DP MST is being used and according to Viktor this started
failing with 3.17, which introduce MST support, so this is very likely related
to that.

It seems the race between hpd_pulse and modeset that Ville tried to address [1]
is triggered, except it doesn't look like there is two concurrent calls to
intel_dp_start_link_train(). 

    [1] https://patchwork.freedesktop.org/patch/58114/

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