[Bug 69250] [Baytrail-M edp] link training failures on resume

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=69250

--- Comment #7 from shui yangwei <yangweix.shui at intel.com> ---
Created attachment 87365
  --> https://bugs.freedesktop.org/attachment.cgi?id=87365&action=edit
dmesg: with new CPU and updated BIOS

(In reply to comment #6)
> The original BYT dmesg is filled with display port link training issues.
> It's obvious the resume time goes ballistic if we keep retrying the link
> training.
> 
> Also note that we get the panel power sequencing timings from VBT, so the
> panel enable time even with the same panel is going to be different between
> HSW and BYT.
> 
> I've fixed a number of DP link training issues lately. Please try the latest
> drm-intel-nightly on BYT, and see if that helps. Attach dmesg with debugs
> enabled if it still fails. Thanks.

We updated our cpu to "VGA Gen 7 id=0f31", and BIOS updated to "v61.R22 X64",
then I use latest -nightly and find eDP resume time is similar with HSW Desktop
now.

Acquire initcall time:
1386.488 msecs   (HSW Desktop: 1599.312 msecs)
Acquire suspend time:
825.701 msecs    (HSW Desktop: 1018.271 msecs)
Acquire resume time:
767.916 msecs    (HSW Desktop: 576.649 msecs)

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