[Bug 52411] [snb] intel gpu never go in rc6 after suspend

[bugzilla-daemon at bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=52411





--- Comment #12 from Ben Widawsky <ben at bwidawsk.net>  2013-01-11 18:45:55 ---
This patch has been submitted to our developer's mailing list. While the patch
itself is fairly benign, I am worried that there is another problem here which
we are missing.

Personally, I fear the extra read is what's actually fixing the problem.
Alexander, could you please try replacing the read of ECOBUS with some other
register. GEN6_GT_MODE for instance. If that works, please try a second read of
GTFIFODBG. If it doesn't work, can you try some other register in the same CL
that isn't ECOBUS or FORCEWAKE?

I'd just like to get as much info into the commit message of the fix before we
upstream the patch.

Thank you.

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