[PATCH 3/5] drm/dp/mst: change MST detection scheme

[Krzysztof Nowicki]

On środa, 25 stycznia 2017 12:24:35 CET Alex Deucher wrote:
> On Wed, Jan 25, 2017 at 12:16 PM, Krzysztof Nowicki
> 
> <krzysztof.a.nowicki at gmail.com> wrote:
> > Hi,
> > 
> > 
> > Is this patch still being considered for pulling in?
> > 
> > Recently I've been fighting with a HP UltraSlim docking station with a MST
> > hub inside in order to get it working with the amdgpu DAL/DC code. I
> > couldn't get it to work until I stumbled upon this patch. Applying it
> > solved the issue instantly.
> > 
> > What I have found during debugging is that the MST hub would return SST
> > sink port numbers < 8 which resulted in no EDID being retrieved and in
> > turn the status of the outputs was 'disconnected'.
> 
> Harry,
> 
> Any chance you could re-spin this against something more recent and re-send?
> 
> Alex

Hi,

I have actually investigated this problem further and noticed that it's a 
problem in the amdgpu DAL/DC driver, which makes an incorrect assumption about 
the presence of a cached EDID. The fact that it started to work was only a 
side-effect of this patch.

I have submitted a patch to amd-gfx with what I believe is the proper fix.

Regards
Chris