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<b><a class="bz_bug_link
bz_status_NEEDINFO "
title="NEEDINFO - Delay in skl_disable_plane() causes a system freeze"
href="https://bugs.freedesktop.org/show_bug.cgi?id=104975#c63">Comment # 63</a>
on <a class="bz_bug_link
bz_status_NEEDINFO "
title="NEEDINFO - Delay in skl_disable_plane() causes a system freeze"
href="https://bugs.freedesktop.org/show_bug.cgi?id=104975">bug 104975</a>
from <span class="vcard"><a class="email" href="mailto:azhar.shaikh@intel.com" title="Azhar <azhar.shaikh@intel.com>"> <span class="fn">Azhar</span></a>
</span></b>
<pre>(In reply to Ville Syrjala from <a href="show_bug.cgi?id=104975#c62">comment #62</a>)
<span class="quote">> (In reply to Ville Syrjala from <a href="show_bug.cgi?id=104975#c61">comment #61</a>)
> > (In reply to Ville Syrjala from <a href="show_bug.cgi?id=104975#c60">comment #60</a>)
> > > (In reply to Azhar from <a href="show_bug.cgi?id=104975#c59">comment #59</a>)
> > > > (In reply to Ville Syrjala from <a href="show_bug.cgi?id=104975#c58">comment #58</a>)
> > > > > 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.</span >
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.</pre>
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