[Bug 90137] [ilk] IPS frequently downclocks the GPU when playing quakelive

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=90137

--- Comment #14 from Chris Wilson <chris at chris-wilson.co.uk> ---
Enabled, unmasked, but never trigger. Huh.

I guess add a sanity check that ironlake_enable_drps() is indeed being called.
Though that should be shown "SW mode enabled" in
/sys/kernel/debug/dri/0/i915_drpc_info

* spots EI intervals and thresholds in there.

At least I'm getting to know this code better, in theory at least.

Can you compare

92bb36c80e561f82b1f4b63cc269a71833137841 - baseline
94afa384a6cddb565d7944c79aa3a2d536e4fe54 - preparation
86a8ed9560350c7ca12d2fb7e8d694a2ea4a60cc - conversion to gen6+ RPS routines

and verify where the bug gets introduced.


(In reply to dimon from comment #13)
> Wow, after a fresh reboot reclocking worked for a short period of time.
> I was getting DE_PCU_EVENTs, pstates alternated between 0 and 10.
> Then it stopped generating DE_PCU_EVENTs and stopped reclocking.

Ah, that's probably my runtime pm experiments to disable the interrupts when
idle. If you jump back to 57c6b89256000f038a5bbc65eb745a6ad3858a6c does it
continue to work even after idle?

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