[Bug 104975] Delay in skl_disable_plane() causes a system freeze

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=104975

--- Comment #68 from Ville Syrjala <ville.syrjala at linux.intel.com> ---
(In reply to Azhar from comment #67)
> (In reply to Azhar from comment #66)
> > (In reply to Ville Syrjala from comment #65)
> > > Hmm. I wonder if we're still barking up the right tree with the DDB angle.
> > > 
> > > I pushed the following hack:
> > > b48dad3fe322 ("hacks: fixed ddb allocation for each plane")
> > > to git://github.com/vsyrjala/linux.git double_buffer_ctl_ddb_wa_hacks
> > > 
> > > Would be nice to know whether that fully eliminates the hang. If it doesn't
> > > then we would seem to be on the wrong track.
> > 
> > The test has been running for more than 5 hours now, with ONLY the top
> > commit "b48dad3fe322 ("hacks: fixed ddb allocation for each plane")"  on
> > linux-stable 4.15.18 branch without IPC support on BXT+.
> > 
> > I will keep it running overnight.
> 
> There was no crash with overnight run for above configuration.

OK. I guess we're still on the right track then.

Let's try to make this double buffer thing as simple as possible:
git://github.com/vsyrjala/linux.git double_buffer_ctl_simple

That approach is no good when multiple pipes are enabled, but for a single pipe
case it's about as simple as we can make it.

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