[Bug 91255] [Skly Regression]Failed to power on power well 2 when no HDMI/DP monitor is connected

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=91255

--- Comment #6 from Libin Yang <libin.yang at intel.com> ---
(In reply to Paulo Zanoni from comment #4)
> Is the audio driver correctly calling i915_audio_component's get_power() and
> put_power()? Those functions are supposed to grab POWER_DOMAIN_AUDIO, which
> is supposed to turn on power well 2 on the graphics driver.

Yes, the audio driver will call get_power()
The reproduce steps on SKL are:
1. bootup with HDMI monitor connected
2. disconnect the monitor
3. wait for several seconds. 5 seconds should be enough
4. run `cat /proc/asound/card0/codec#2
5. run `cat /proc/asound/card0/eld*

You will find the eld info and codec info are wrong. And when you run dmesg,
you will find the CSR firmware not ready error message.

BTW: we tested today latest kernel, it seems we can get the correct eld info,
but the CSR firmware not ready message still exists.

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