[Bug 97442] [HSW HDMI] Audio with 44.1 khz not working when 1920x1080p screen refreshrate > 30hz

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=97442

--- Comment #31 from Libin Yang <libin.yang at intel.com> ---
(In reply to Mark Wilczynski from comment #30)
> (In reply to Jani Nikula from comment #29)
> > See also https://patchwork.freedesktop.org/series/11252/
> 
> That patch is similar to my solution.  It just needs to be expanded to deal
> with a couple high-clock 1920x1080p modes instead of just 4K resolutions.
> 
> The incorrect TMDS clock for 1920x1080 at 59.940 is an unrelated bug but should
> be addressed as well because it may affect the selection of proper N values
> required to fix 44.1 kHz audio.
> 
> BTW, the CTS (or M) values in my patched table are not correct.  I didn't
> fill those in because the code didn't use them for HDMI.  Only the N value
> is used.

Yes, we didn't use CTS for HDMI. We found if N is set correctly, HW can handle
it automatically. To reduce the bugs introduced by sw, we skipped setting the
CTS value. However we set the M value for DP now.

For this bug, I'm thinking whether we need calculate the n/cts/m value
automatically instead of using the table as the clock may vary with mode?

Regards,
Libin

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