[Bug 89600] [BSW] GPU hangs after S3+S4, if execlists enabled

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=89600

--- Comment #25 from peter.antoine at intel.com ---
This is a problem that has been seen before on other systems.
It is a timing issue with the way the registers are restored when the system
comes out of power saving.

I have a patch that has survived 10 S3 and 10 S4 without a GPU hang.

The patch simply changes the order that bits of the system are being
re-initialised after a resume.

Patch will be released to linux-gfx within the hour.

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