[Bug 98797] [BXT/KBL] - HDMI - HD audio passthrough dont work

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=98797

--- Comment #101 from Achilles <lqvnguyen at hotmail.com> ---
(In reply to Jani Nikula from comment #93)
> (In reply to chrisk2305 from comment #92)
> > It is proven in this thread:
> > https://forum.kodi.tv/showthread.php?tid=270298&page=95
> > 
> > All Windows Users can use HD Audio passthrough via the HDMI 2.0 (LSPCON)
> > with FW 1.66.
> 
> I'll take your word for it, rather than go through 95 pages of forums... ugh.
> 
> ---
> 
> Random debug note: We don't consider audio bandwidth requirements for link
> training, only video mode. If the video mode just barely fits in the link, I
> think it'll impact audio.

Jani,

If I may add, Dolby Digital and DTS passthrough works and Stereo PCM works.
These are all limited to 1.5Mbps per the S/PDIF specs. Is it possible DP is
being subjected to the limits of the S/PDIF specs in the DRM driver?

Per Wikipedia:
S/PDIF can carry two channels of uncompressed PCM audio or compressed 5.1/7.1
surround sound (such as DTS audio codec); it cannot support lossless formats
(other than 2ch LPCM) such as Dolby TrueHD and DTS-HD Master Audio, that
require greater bandwidth[2] like that available with HDMI or DisplayPort.

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