[Bug 54226] [snb 3.5] stale semaphore sync seqno (typically as seen on bcs->rcs)

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=54226

--- Comment #140 from Phil Turmel <philip at turmel.org> ---
(In reply to comment #139)
> Oh that's interesting. We might be able to find a register to prevent rc6
> whilst waiting on a semaphore. (Hmm, too bad it isn't ivb or we could just
> frob forcewake directly.)

Happy to test patches.  I'm updating to 3.13.9 tonight.  I could add something
on top if you have ideas.  If you need more info than my attachment to #76801
just let me know.

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