[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 #62 from Ville Syrjala <ville.syrjala at linux.intel.com> ---
(In reply to Ville Syrjala from comment #61)
> (In reply to Ville Syrjala from comment #60)
> > (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.
> 
> Actually never mind. I still seems to fail here. Just makes a bit harder to
> hit :(

OK, yet another commit pushed. So far this is showing a bit more promise here.
I'll leave it running overnight to see if it ends up tripping over later.

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