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<b><a class="bz_bug_link
bz_status_NEW "
title="NEW - [KBL] [drm:skl_set_cdclk] *ERROR* failed to inform PCU about cdclk change"
href="https://bugs.freedesktop.org/show_bug.cgi?id=99345#c6">Comment # 6</a>
on <a class="bz_bug_link
bz_status_NEW "
title="NEW - [KBL] [drm:skl_set_cdclk] *ERROR* failed to inform PCU about cdclk change"
href="https://bugs.freedesktop.org/show_bug.cgi?id=99345">bug 99345</a>
from <span class="vcard"><a class="email" href="mailto:ryabinin.a.a@gmail.com" title="Andrey <ryabinin.a.a@gmail.com>"> <span class="fn">Andrey</span></a>
</span></b>
<pre>(In reply to Imre Deak from <a href="show_bug.cgi?id=99345#c5">comment #5</a>)
<span class="quote">> (In reply to Andrey from <a href="show_bug.cgi?id=99345#c4">comment #4</a>)
> 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.
> </span >
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.</pre>
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