[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 #64 from Azhar <azhar.shaikh at intel.com> ---
(In reply to Azhar from comment #63)
> (In reply to Ville Syrjala from comment #62)
> > (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.
> 
> 
> With the patches on the double_buffer_ctl_ddb_wa branhc, on Linux-stable
> 4.15.18 and without the support of IPC on BXT+, still causes hard hangs.

I re-ran the test second time and it did crash again. But this time it took a
longer time to crash. Earlier (before this patch) it used to crash within 15-20
mins, but this time it took more than 2 hours to crash. So looks like there is
some improvement.

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