[Bug 107546] Screen is frozen on second connection of DP MST dock

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=107546

--- Comment #46 from Stanislav Lisovskiy <stanislav.lisovskiy at intel.com> ---
(In reply to Brian Ward from comment #45)
> (In reply to Stanislav Lisovskiy from comment #44)
> > Hi,
> > 
> > I guess you need to apply this patch:
> > 
> > https://patchwork.freedesktop.org/patch/261135/
> 
> Thanks for the suggestion Stan, unfortunately that one didn't change any
> behavior for me, and it appears it is already committed to the 4.19 branch.
> 
> I've tested with a custom build direct from 4.19 as well as custom fedora
> build from 4.19, and latest fedora release 4.19.13-300.fc29.x86_64, all of
> which appear to already have that patch.
> 
> Looks like there are a lot of big changes in the two files that seem most
> likely culprits to the errors...
> 
> $ git diff v4.20 v4.19 -- drivers/gpu/drm/i915/intel_dp_link_training.c |
> grep @@ | wc -l
> 5
> $ git diff v4.20 v4.19 -- drivers/gpu/drm/i915/intel_ddi.c | grep @@ | wc -l
> 16
> 
> I'll try to find some time to actually debug the error on v4.19 and find out
> what changes resolve the problem, but it may be a while.

Do you get a similar call trace?

> [  321.497722] Call Trace:
> [  321.497725]  refcount_inc+0x5/0x30
> [  321.497730]  drm_dp_get_mst_branch_device+0xc2/0xe0 [drm_kms_helper]
> [  321.497735]  drm_dp_mst_hpd_irq+0x104/0x8c0 [drm_kms_helper]
> [  321.497750]  ? intel_dp_check_mst_status+0xba/0x1e0 [i915]
> [  321.497763]  intel_dp_check_mst_status+0xba/0x1e0 [i915]
> [  321.497776]  intel_dp_hpd_pulse+0x176/0x2e0 [i915]
> [  321.497778]  ? __switch_to_asm+0x40/0x70
> [  321.497791]  i915_digport_work_func+0x8f/0x120 [i915]
> [  321.497794]  process_one_work+0x195/0x370
> [  321.497795]  worker_thread+0x30/0x390
> [  321.497797]  ? process_one_work+0x370/0x370
> [  321.497799]  kthread+0x113/0x130
> [  321.497800]  ? kthread_create_worker_on_cpu+0x70/0x70
> [  321.497802]  ret_from_fork+0x35/0x40

https://patchwork.freedesktop.org/patch/261135/ patch reportedly fixes the
issue
in https://bugs.freedesktop.org/show_bug.cgi?id=108616, which has exactly same
backtrace. Otherwise I have a feeling that we are talking about different
issues in a same ticket here.

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