[Bug 91410] [BDW][Audio][HD-A Display] DP/HDMI audio playback abnormal

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=91410

--- Comment #24 from Jim Bride <jim.bride at linux.intel.com> ---
I'm not so sure that this is a race per se.  From the brief look I took at the
HDA driver, it seems that the audio code believes that CDCLK stays at a fixed
value and thus it only confirms the value during its initial init and when a
resume operation occurs.  Since CDCLK can be changed at various times on some
platforms, it seems like what we need is some sort of a callback mechanism to
notify the audio driver when CDCLK gets set to a new value so that they can
update their M/N values appropriately.  Alternately, although I'd leave this
determination to folks that are more familiar with the audio driver, if there's
a good spot where they can call snd_hdac_get_display_clk() periodically and
update their M/N values if the new value differs from the previous value that
they have then that would work too.  Thoughts?

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