[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 #60 from Ville Syrjala <ville.syrjala at linux.intel.com> ---
(In reply to Azhar from comment #59)
> (In reply to Ville Syrjala from comment #58)
> > It looks like I managed to avoid the planes staying on past their bedtime
> > with the following branch:
> > git://github.com/vsyrjala/linux.git double_buffer_ctl_ddb_wa
> > 
> > I hope it will also prevent the hard hangs. Please test.
> 
> 
> With this patch on Linux-stable 4.15.18 without the support of IPC on BXT+,
> still causes hard hangs.

Argh. OK, so looks like what I had there is only sufficient for linear buffers
for some unknown reason. To make the planes appear to work correctly with tiled
buffers I had to frob the double buffer disable bits some more between the
ddb/wm and plane programming steps.

I pushed an additional commit to the same branch:
git://github.com/vsyrjala/linux.git double_buffer_ctl_ddb_wa

Please test again.

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