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Date: Fri, 18 Aug 2023 06:24:32 +0000
From: Simon Ser <contact@...rsion.fr>
To: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
Cc: Laurent Pinchart <laurent.pinchart@...asonboard.com>,
dri-devel@...ts.freedesktop.org, amd-gfx@...ts.freedesktop.org,
Andrzej Hajda <andrzej.hajda@...el.com>,
Janne Grunau <j@...nau.net>, Robert Foss <rfoss@...nel.org>,
Rodrigo Siqueira <Rodrigo.Siqueira@....com>,
Jernej Skrabec <jernej.skrabec@...il.com>,
Andy Gross <agross@...nel.org>,
Thomas Zimmermann <tzimmermann@...e.de>,
Jonas Karlman <jonas@...boo.se>, Leo Li <sunpeng.li@....com>,
intel-gfx@...ts.freedesktop.org,
Tvrtko Ursulin <tvrtko.ursulin@...ux.intel.com>,
Maxime Ripard <mripard@...nel.org>,
Rodrigo Vivi <rodrigo.vivi@...el.com>,
Neil Armstrong <neil.armstrong@...aro.org>,
Bjorn Andersson <andersson@...nel.org>,
"Pan, Xinhui" <Xinhui.Pan@....com>, linux-kernel@...r.kernel.org,
Konrad Dybcio <konrad.dybcio@...aro.org>,
Alex Deucher <alexander.deucher@....com>,
Christian König <christian.koenig@....com>
Subject: Re: [PATCH 3/4] drm/uapi: document the USB subconnector type
On Thursday, August 17th, 2023 at 21:33, Dmitry Baryshkov <dmitry.baryshkov@...aro.org> wrote:
> We have been looking for a way to document that the corresponding DP
> port is represented by the USB connector on the device.
>
> Consequently, I believe the best way to document it, would be to use
> DisplayPort / USB, when there is no dongle connected, switching to
> DisplayPort / HDMI, DisplayPort / VGA, DisplayPort / DisplayPort, etc.
> when the actual dongle / display is connected and then switching back to
> the DisplayPort / USB when it gets disconnected.
>
> If this sounds good to all parties, I'll post v2, adding this
> explanation to the cover letter.
But how can user-space discover that the port is USB-C when it's
connected? That information is lost at this point.
(In addition, this clashes with the existing semantics of the
subconnector prop as discussed before: USB-C is not sub-, it's super-.)
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