[Bug 99345] [KBL] [drm:skl_set_cdclk] *ERROR* failed to inform PCU about cdclk change

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=99345

--- Comment #6 from Andrey <ryabinin.a.a at gmail.com> ---
(In reply to Imre Deak from comment #5)
> (In reply to Andrey from comment #4)
> Ok, please let me know if you see the 'failed to inform PCU' error with this
> patch after longer use. Would be also good to know the maximum poll duration
> you see based on the timestamp diff of the lines like the following two:
> 
> [   65.704858] [drm:skl_pcode_request] PCODE timeout, retrying with
> preemption disabled
> [   65.707102] [drm:intel_update_cdclk] Current CD clock rate: 337500 kHz,
> VCO: 8100000 kHz, ref: 24000 kHz
> 
> In your first dmesg it was ~10ms in the second ~4ms.
> 


I've been running suspend-resume display script for couple hours and haven't 
seen any 'failed to inform PCU' errors. 

There were 46 PCODE timeouts. The maximum timestamp diff was 34ms:
[ 6689.473863] [drm:skl_pcode_request] PCODE timeout, retrying with preemption
disabled
[ 6689.508758] [drm:intel_update_cdclk] Current CD clock rate: 337500 kHz, VCO:
8100000 kHz, ref: 24000 kHz

There was also one 15ms. All other timeouts >=4ms.

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