From: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
To: Simon Ser <contact@emersion.fr>
Cc: "Dmitry Baryshkov" <dmitry.baryshkov@linaro.org>,
"David Airlie" <airlied@gmail.com>,
"Daniel Vetter" <daniel@ffwll.ch>,
"Andrzej Hajda" <andrzej.hajda@intel.com>,
"Neil Armstrong" <neil.armstrong@linaro.org>,
"Robert Foss" <rfoss@kernel.org>,
"Jonas Karlman" <jonas@kwiboo.se>,
"Jernej Skrabec" <jernej.skrabec@gmail.com>,
"Andy Gross" <agross@kernel.org>,
"Bjorn Andersson" <andersson@kernel.org>,
"Konrad Dybcio" <konrad.dybcio@linaro.org>,
"Janne Grunau" <j@jannau.net>,
"Alex Deucher" <alexander.deucher@amd.com>,
"Christian König" <christian.koenig@amd.com>,
"Pan, Xinhui" <Xinhui.Pan@amd.com>,
"Harry Wentland" <harry.wentland@amd.com>,
"Leo Li" <sunpeng.li@amd.com>,
"Rodrigo Siqueira" <Rodrigo.Siqueira@amd.com>,
"Maarten Lankhorst" <maarten.lankhorst@linux.intel.com>,
"Maxime Ripard" <mripard@kernel.org>,
"Thomas Zimmermann" <tzimmermann@suse.de>,
"Jani Nikula" <jani.nikula@linux.intel.com>,
"Joonas Lahtinen" <joonas.lahtinen@linux.intel.com>,
"Rodrigo Vivi" <rodrigo.vivi@intel.com>,
"Tvrtko Ursulin" <tvrtko.ursulin@linux.intel.com>,
amd-gfx@lists.freedesktop.org, dri-devel@lists.freedesktop.org,
linux-kernel@vger.kernel.org, intel-gfx@lists.freedesktop.org
Subject: Re: [PATCH 3/4] drm/uapi: document the USB subconnector type
Date: Thu, 3 Aug 2023 23:44:59 +0300 [thread overview]
Message-ID: <20230803204459.GD27752@pendragon.ideasonboard.com> (raw)
In-Reply-To: <ADjuOeqA6575DKutMPaR9mW9rLhm-wjLc4ruoUkNwImf-GB90FdwDB7v7y6LFdzVG3BC4R52A0RUtStK4_smmGYTUs3UPDOX4T4Zl2YHkxE=@emersion.fr>
On Thu, Aug 03, 2023 at 03:31:16PM +0000, Simon Ser wrote:
> On Thursday, August 3rd, 2023 at 17:22, Simon Ser <contact@emersion.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 ?
> However, in the USB-C case, DP itself is tunneled inside USB-C. And you
> might use a USB-C → DP adapter. So it's not really *sub*connector, it's
> more of a *super*connector, right?
>
> I think [1] is somewhat related, since it also allows user-space to
> discover whether a connector uses USB-C. But relying on sysfs to figure
> this out isn't super optimal perhaps.
>
> [1]: https://lore.kernel.org/dri-devel/20221108185004.2263578-1-wonchung@google.com/
--
Regards,
Laurent Pinchart
next prev parent reply other threads:[~2023-08-03 20:45 UTC|newest]
Thread overview: 26+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-07-29 0:49 [PATCH 0/4] drm/bridge-connector: simplify handling of USB-C DP Dmitry Baryshkov
2023-07-29 0:49 ` [PATCH 1/4] drm: allow specifying default subtype for the DP subconnector property Dmitry Baryshkov
2023-08-02 18:54 ` Laurent Pinchart
2023-08-02 19:01 ` Dmitry Baryshkov
2023-07-29 0:49 ` [PATCH 2/4] drm/bridge-connector: handle subconnector types Dmitry Baryshkov
2023-08-02 8:35 ` Neil Armstrong
2023-08-02 9:05 ` Dmitry Baryshkov
2023-08-02 18:46 ` Laurent Pinchart
2023-08-02 18:51 ` Dmitry Baryshkov
2023-07-29 0:49 ` [PATCH 3/4] drm/uapi: document the USB subconnector type Dmitry Baryshkov
2023-08-02 18:55 ` Laurent Pinchart
2023-08-02 19:01 ` Dmitry Baryshkov
2023-08-02 19:13 ` Laurent Pinchart
2023-08-02 19:23 ` Dmitry Baryshkov
2023-08-03 15:22 ` Simon Ser
2023-08-03 15:31 ` Simon Ser
2023-08-03 15:36 ` Dmitry Baryshkov
2023-08-03 15:43 ` Simon Ser
2023-08-03 15:49 ` Dmitry Baryshkov
2023-08-03 20:44 ` Laurent Pinchart [this message]
2023-08-03 20:46 ` Simon Ser
2023-08-03 20:57 ` Dmitry Baryshkov
2023-08-17 19:33 ` Dmitry Baryshkov
2023-08-18 6:24 ` Simon Ser
2023-08-18 10:30 ` Dmitry Baryshkov
2023-07-29 0:49 ` [PATCH 4/4] soc: qcom: pmic_glink: properly describe the DP connector Dmitry Baryshkov
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