[Bug 104952] [regression] Loss of i915 (Apollo Lake/Broxton) HDMI audio after display sleep v4.14+

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=104952

--- Comment #13 from Imre Deak <imre.deak at intel.com> ---
Created attachment 137246
  --> https://bugs.freedesktop.org/attachment.cgi?id=137246&action=edit
Save/restore AUD_FREQ_CNTRL

(In reply to Jani Nikula from comment #12)
> Imre, was looking at bspec for other stuff, might bspec id 19620 be related?

Most of the context save/restore described there is done (or should be done) by
the audio driver; I haven't checked that part in detail, I hope the audio
people can do that. Two things from the save/restore sequence must be done on
the display driver side (since the registers belong to it): programming
HSW_AUD_CHICKENBIT and saving/restoring SKL_AUD_FREQ_CNTRL . I haven't found
anything in the driver about the latter one.

Simon could you try if the attached patch makes a difference for you (providing
the dmesg in any case)?

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