[Bug 105949] System stall on Supermicro SKL boards on drm-tip

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=105949

Imre Deak <imre.deak at intel.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |NEEDINFO

--- Comment #17 from Imre Deak <imre.deak at intel.com> ---
(In reply to Martin Peres from comment #16)
> (In reply to Eugeny from comment #15)
> > Created attachment 139406 [details]
> > dmesg v4
> > 
> > Trying apply path https://bugs.freedesktop.org/attachment.cgi?id=138930 on
> > HEAD 29940f138482ff38047287ad288cea1fcf1f73b4 shows warning: "patch
> > unexpectedly ends in middle of line"
> 
> The patch is complete, so something is definitely wrong here...
> 
> > 
> > but still I tried built it and got dmesg after 10 tries.
> 
> Anyways, we let this bug fall through the cracks, and I am sorry about that!
> 
> Do you think it is possible for you to re-test again?

There was an offline discussion where the conclusion was that there is no
problem with the programming sequence of PLL enabling in the driver, at least
based on BSpec. So no need to try the patch. Extending the PLL lock timeout
makes the bug more difficult to reproduce, but even with a 1 sec timeout it
happens from time to time. So we need to debug further the root cause of the
lock failure and possibly try to use an alternative clock source. Since the
problem looks related to this specific system (SuperMicro SKL) we need a
version of that board with JTAG connector and JTAG debugging enabled. I asked
Eugeny to contact the vendor if it's possible to get such a board.

Accordingly setting this to NEEDINFO.

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