[Bug 94566] [BAT SKL]igt at kms_pipe_crc_basic@suspend-read-crc-pipe-c fails suspend autoresume

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=94566

--- Comment #7 from Takashi Iwai <tiwai at suse.de> ---
(In reply to Libin Yang from comment #6)
> I did the test on my SKL with latest nightly kernel doing the s3 stress
> test. But I can't reproduce this issue.
> 
> If it is the i915_power_refcount issue, is there any possibility that the
> below will happen:
> 1. runtime_resume is called (link_power_control is not set so far)
> 2. set the codec->core.link_power_control = 1 in hdmi audio driver
> 3. runtime_suspend is called

Well, it means that the runtime PM up/down occurs during the codec driver
initialization.  This shouldn't happen normally.

Maybe the module reloading is a key to trigger?  I saw that some module
reloading test was done before the failing tests.  We forgot something at
removal, then leading to unbalance...?

In anyway, if Intel people can show me the exact reproducer that can run on my
system, it'd be really helpful.

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