[Bug 103484] SSEU status is all 0 on BXT

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=103484

--- Comment #13 from Lionel Landwerlin <lionel.g.landwerlin at linux.intel.com> ---
Most of the register that give us the power status of slices/subslices/EUs are
named "... Acknowledge".
So it sounds like they report the last programmed status.

The register setting the slice/subslice/EU powergating state (0x20c8), is only
programmable through the RCS. So it would make sense that we need to forcewake
render to be able to read a sensible status.

That would explain why we see 0s on pretty much all platforms.

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