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Date: Thu, 03 Aug 2023 20:46:55 +0000
From: Simon Ser <contact@...rsion.fr>
To: Laurent Pinchart <laurent.pinchart@...asonboard.com>
Cc: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>,
David Airlie <airlied@...il.com>,
Daniel Vetter <daniel@...ll.ch>,
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Subject: Re: [PATCH 3/4] drm/uapi: document the USB subconnector type
On Thursday, August 3rd, 2023 at 22:44, Laurent Pinchart <laurent.pinchart@...asonboard.com> wrote:
> On Thu, Aug 03, 2023 at 03:31:16PM +0000, Simon Ser wrote:
>
> > On Thursday, August 3rd, 2023 at 17:22, Simon Ser contact@...rsion.fr wrote:
> >
> > > The KMS docs describe "subconnector" to be defined as "downstream port" for DP.
> > > Can USB-C (or USB) be seen as a DP downstream port?
> >
> > To expand on this a bit: I'm wondering if we're mixing apples and
> > oranges here. The current values of "subconnector" typically describe
> > the lower-level protocol tunneled inside DP. For instance, VGA can be
> > tunneled inside the DP cable when using DP → VGA adapter.
>
> Doesn't this contradict the example use case you gave in your previous
> e-mail, with wlroots stating "DP-3 via DVI-D" ? I understand that as DP
> carried over a DVI-D physical connector, did I get it wrong ?
No, this is DVI carried over DP. DP cannot be carried over VGA/DVI/HDMI,
but VGA/DVI/HDMI can be carried over DP.
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