Some eDP fixes/improvements.

[Timo Aaltonen]

On 9.1.2020 17.20, Mario Kleiner wrote:
> Hi and happy new year!
> 
> Since i now have a MBP 2017 to play with, with a 10 bit Retina panel,
> and Polaris gpu, i'm trying to get it to get 10 bits, and found one
> small bug [fix: patch1], and a quirk of Apples Retina eDP sink, for
> which i propose patch2 as solution. I sent a similar patch to i915 to
> make 10 bit Retina work with the Intel Kabylake igp on that machine.
> 
> If these make sense, it would be cool to still get them into drm-fixes
> for Linux 5.5, so users of spring distro updates like Ubuntu 20.04 LTS
> can get a more colorful new year.

Just FTR, 20.04 will ship with 5.4 longterm kernel, not 5.5.


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