[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 #139 from Chris Wilson <chris at chris-wilson.co.uk> ---
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.)

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