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Message-ID: <Ztgp_8UxEgBCiEMz@google.com>
Date: Wed, 4 Sep 2024 09:35:59 +0000
From: Tzung-Bi Shih <tzungbi@...nel.org>
To: Stephen Boyd <swboyd@...omium.org>
Cc: chrome-platform@...ts.linux.dev, linux-kernel@...r.kernel.org,
patches@...ts.linux.dev, devicetree@...r.kernel.org,
Douglas Anderson <dianders@...omium.org>,
Pin-yen Lin <treapking@...omium.org>,
Andrzej Hajda <andrzej.hajda@...el.com>,
Benson Leung <bleung@...omium.org>,
Conor Dooley <conor+dt@...nel.org>, Daniel Vetter <daniel@...ll.ch>,
David Airlie <airlied@...il.com>,
Dmitry Baryshkov <dmitry.baryshkov@...aro.org>,
dri-devel@...ts.freedesktop.org,
Guenter Roeck <groeck@...omium.org>,
Jernej Skrabec <jernej.skrabec@...il.com>,
Jonas Karlman <jonas@...boo.se>,
Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
Laurent Pinchart <Laurent.pinchart@...asonboard.com>,
Lee Jones <lee@...nel.org>,
Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
Maxime Ripard <mripard@...nel.org>,
Neil Armstrong <neil.armstrong@...aro.org>,
Prashant Malani <pmalani@...omium.org>,
Robert Foss <rfoss@...nel.org>, Rob Herring <robh+dt@...nel.org>,
Thomas Zimmermann <tzimmermann@...e.de>,
Alexandre Belloni <alexandre.belloni@...tlin.com>,
Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
Daniel Scally <djrscally@...il.com>,
Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
Heikki Krogerus <heikki.krogerus@...ux.intel.com>,
Ivan Orlov <ivan.orlov0322@...il.com>, linux-acpi@...r.kernel.org,
linux-usb@...r.kernel.org,
Mika Westerberg <mika.westerberg@...ux.intel.com>,
"Rafael J . Wysocki" <rafael.j.wysocki@...el.com>,
Sakari Ailus <sakari.ailus@...ux.intel.com>,
Vinod Koul <vkoul@...nel.org>
Subject: Re: [PATCH v4 16/18] platform/chrome: cros_ec_typec: Add support for
signaling DP HPD via drm_bridge
On Sat, Aug 31, 2024 at 09:06:54PM -0700, Stephen Boyd wrote:
> We can imagine that logically the EC is a device that has some number of
> DisplayPort (DP) connector inputs, some number of USB3 connector inputs,
> and some number of USB type-c connector outputs. If you squint enough it
> looks like a USB type-c dock. Logically there's a crossbar pin
> assignment capability within the EC that can assign USB and DP lanes to
> USB type-c lanes in the connector (i.e. USB type-c pin configurations).
> In reality, the EC is a microcontroller that has some TCPCs and
> redrivers connected to it over something like i2c and DP/USB from the AP
> is wired directly to those ICs, not the EC.
>
> [...]
>
> Cc: Prashant Malani <pmalani@...omium.org>
> Cc: Benson Leung <bleung@...omium.org>
> Cc: Tzung-Bi Shih <tzungbi@...nel.org>
> Cc: <chrome-platform@...ts.linux.dev>
> Cc: Pin-yen Lin <treapking@...omium.org>
> Signed-off-by: Stephen Boyd <swboyd@...omium.org>
Reviewed-by: Tzung-Bi Shih <tzungbi@...nel.org>
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