[Bug 99137] Weird colours on usb-c to hdmi output

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=99137

--- Comment #8 from Ville Syrjala <ville.syrjala at linux.intel.com> ---
I'm not really sure how the DP->HDMI branch devices handle color depth. ATM we
assume we can feed whatever bpc to DP sinks that are reported as supported in
DPCD. But if the DP->HDMI conversion doesn't do anything to adjust the bpc,
then we'll be feeding that all the way to the sink. Which means we should be
checking the sink capabilities as well. Currently we only check for sink deep
color support, but we fail to account for the sink max TMDS clock (or the DP++
dongle max TMDS clock if we have a DP->DP++->HDMI type of setup).

Also the sink should be told what the color depth is with the GCP infoframe.
Whether or not that would be done automagically by the DP->HDMI device, or if
we would have to send out that infoframe all the way from the source is totally
left out from the DP spec. For this it would be extremely nice to see the
infoframes the sink is actually receiving (doable with the chamelium?).

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