From: Krzysztof Nowicki <krzysztof.a.nowicki@gmail.com>
To: dri-devel@lists.freedesktop.org
Subject: Re: [PATCH 3/5] drm/dp/mst: change MST detection scheme
Date: Fri, 27 Jan 2017 19:21:57 +0100 [thread overview]
Message-ID: <1512901.4oY53169lK@cruinn> (raw)
In-Reply-To: <CADnq5_PzgtWWJcK1X0yUi-b7C4rmv-v+A4EcVo4Q+jAJVoT7Mg@mail.gmail.com>
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@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
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next prev parent reply other threads:[~2017-01-27 18:22 UTC|newest]
Thread overview: 22+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-01-22 22:07 [PATCH 0/5] Fixes for MST (daisy-chain and 4k tiles) Harry Wentland
2016-01-22 22:07 ` [PATCH 1/5] drm: Add drm_fixp_from_fraction and drm_fixp2int_ceil Harry Wentland
2016-01-22 22:07 ` [PATCH 2/5] drm/dp/mst: Calculate MST PBN with 31.32 fixed point Harry Wentland
2016-01-22 22:07 ` [PATCH 3/5] drm/dp/mst: change MST detection scheme Harry Wentland
2016-02-17 5:45 ` Dave Airlie
2016-02-18 4:53 ` Lysenko, Mykola
2016-02-23 3:09 ` Lysenko, Mykola
2016-05-12 22:41 ` Grodzovsky, Andrey
2016-06-15 3:49 ` Dave Airlie
2016-06-15 4:14 ` Dave Airlie
2017-01-25 17:16 ` Krzysztof Nowicki
2017-01-25 17:24 ` Alex Deucher
2017-01-25 18:32 ` Harry Wentland
2017-01-25 22:46 ` Alex Deucher
2017-01-25 23:07 ` Harry Wentland
2017-01-27 18:21 ` Krzysztof Nowicki [this message]
2016-01-22 22:07 ` [PATCH 4/5] drm/dp/mst: move GUID storage from mgr, port to only mst branch Harry Wentland
2016-01-22 22:07 ` [PATCH 5/5] drm/dp/mst: Reverse order of MST enable and clearing VC payload table Harry Wentland
2016-01-25 4:53 ` [PATCH 0/5] Fixes for MST (daisy-chain and 4k tiles) Dave Airlie
2016-01-25 18:55 ` Wentland, Harry
2016-02-02 21:20 ` Alex Deucher
2016-02-04 0:35 ` Dave Airlie
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