[Bug 89419] [SKL][Audio][HD-A Display]: Can't detect Display audio codec if not connect HDMI and DP monitor when boot up

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=89419

Imre Deak <imre.deak at intel.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |tiwai at suse.de

--- Comment #14 from Imre Deak <imre.deak at intel.com> ---
(In reply to jinliangx.wang from comment #13)
> Created attachment 114575 [details]
> dmesg with patch applied

Thanks.

I think there are multiple issues here, one is that the audio driver didn't ask
for its power well, this is fixed by the patch in comment 7. The patch needs to
be updated since it will also make haswell_set_bclk program the EM4/5 registers
which are not existant on SKL.

Since the above fix is not enough, I assume that something needed by audio gets
reset when turning off the audio power well and doesn't get reinitialized when
reenabling it.

Adding Takashi for any insight.

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