[Bug 103347] [dp] intel_dp.c:1554 WARN_ON(len <=8)

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=103347

--- Comment #12 from F.Hartung <f.hartung at outlook.de> ---
I'm pretty sure it uses a LSPCON since I updated the hdmi firmware with this
tool to 1.72
(https://downloadcenter.intel.com/download/26609/NUCs-HDMI-2-0-Firmware-Update-Tool-for-Intel-NUC-Kit-NUC6CAY-and-NUC7i3BN?product=95069)
to solve audio issues.

There is a whole thread about the problems of the Intel Apollo Lake platform
and others with quite a similar board (J4205-ITX) report they also updated
their hdmi firmware. 
https://forum.kodi.tv/showthread.php?tid=270298&pid=2553256#pid2553256

The Apollo Lake boards use a "HDMI-2.0-LSPCon MegaChips MCDP2800", there is a
similar chip on my board so I'm pretty sure it is an internal DP port mapped to
the HDMI port.

http://www.megachips.com/products/displayport/MCDP28x0

https://www.heise.de/imgs/18/2/2/5/8/6/6/2/MegaChips-MCDP2800-903a5c8eddf6bffc-b4c059ea0025935c.jpeg

https://www.heise.de/newsticker/meldung/Intel-Celeron-Gemini-Lake-mit-HDMI-2-0-und-SGX-3801532.html

I have a second TV of the same model and it's connected to my main HTPC with an
i3-6100 & GA-B150N Phoenix-WIFI board. This combination works quite fine, also
the logging of those messages started with kernel 4.15 so I guess it's related
to recent patches.

So all in all I'm pretty sure it's using the same lspcon & I didn't use the
wrong system to gather information.

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