[Bug 93917] [BXT-P /APL] Corruption is seen on eDP with 3 pipes

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=93917

--- Comment #4 from Jim Bride <jim.bride at linux.intel.com> ---
(In reply to Jim Bride from comment #3)
> [ 2767.011766] [drm:intel_update_cdclk] Current CD clock rate: 288000 kHz
> 
> I wonder if we're running into the following (from the B-Spec SKL+ CDCLK_CTL
> register description):
> 
> Do not use DisplayPort with CDCLK less than 432 MHz, audio enabled, port
> width x4, and link rate HBR2 (5.4 GHz), or else there may be audio
> corruption or screen corruption.

Additionally, it's worth noting that on BXT A the only operation external port,
Port B (ddi0), has LSPCON in front of it and there is not currently support in
the kernel to configure LSPCON.  The CDCLK issue is still pertinent perhaps
(likely, in fact) but any other behavior on Port B with BXT A is certainly
suspect until we have LSPCON configuration support in the kernel.

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