[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 #84 from Achilles <lqvnguyen at hotmail.com> ---
(In reply to Libin Yang from comment #83)
> (In reply to Jani Nikula from comment #82)
> > (In reply to Achilles from comment #81)
> > > (In reply to Peter Frühberger from comment #78)
> > > > @Shashank: Yeah please sync with Jani / Audio-Team offline on that matter as
> > > > what you are currently testing has nothing to do with this bugreport here.
> > > @shashank
> > > You need to test HD audio bitstreaming/passthrough and not PCM audio that
> > > has been decoded by a player.
> > 
> > Yeah, we have a gap here. Libin?
> 
> Do you mean the test cases? If yes, I think our QA can share the test cases
> internally. I'm not sure we can share the cases outsides.
> 
> For the HBR audio test, I can share some knowledge as I know.
> 
> There is 2 modes to play HBR audio, one is sw decode, the other is hw decode.
> My understanding is this thread is talking about hw decode.
Correct. The bug is with external HW decoding of HD Audio bitstreamed (not
decoded) via DP->LSPCon->HDMI2.0 port to an AVR.

> 
> mplayer supports 2 modes with different parameters. If using hw decode, we
> need a AV receiver which supports hw decode (Some AV receivers need manually
> setting to use hw decode, others don't). 
> 
> So use hw decode in mplay and right setting in AV receiver can do the test
> for HBR audio.
You can test this with LibreELEC/KODI as well. I have tested this with the
following Intel NUCs. All were connected to a Denon AVR-4311ci that handles the
HD audio decoding.

NUCD54250WYK (Haswell): HD Audio bitstream works due to native HDMI1.4
NUC5PPYH (Braswell): HD Audio bitstream works due to native HDMI1.4
NUC5i7RYH (Broadwell): HD Audio bitstream works due to native HDMI1.4
NUC6i3SYK (Skylake): HD Audio bitstream works due to native HDMI1.4
NUC6i5SYK (Skylake): HD Audio bitstream works due to native HDMI1.4
NUC6i7KYK (Skylake): HD Audio bitstream doesn't work due to Parade LSPCon
NUC7i3BNK (Kaby Lake): HD Audio bitstream doesn't work due to MC2x00 LSPCon
NUC7i7BNH (Kaby Lake): HD Audio bitstream doesn't work due to MC2x00 LSPCon

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