linux-kernel - Re: [PATCH v2 00/11] platform/chrome: Add DT USB/DP muxing/topology support

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Message-ID: <CAE-0n50J3vuSKEPM5Pum+8CiQ6_X=Q0eCzyEJLkyof0awCWjow@mail.gmail.com>
Date: Fri, 16 Aug 2024 22:12:54 +0000
From: Stephen Boyd <swboyd@...omium.org>
To: chrome-platform@...ts.linux.dev
Cc: 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>, Tzung-Bi Shih <tzungbi@...nel.org>
Subject: Re: [PATCH v2 00/11] platform/chrome: Add DT USB/DP muxing/topology support

Quoting Stephen Boyd (2024-08-14 17:34:05)
>
> I'm thinking of working in changes so that the drm_dp_typec_bridge
> registers a 'struct typec_mux_dev' as well. If that is done then we can
> register a drm_dp_typec_bridge from the port manager and let the type-c
> framework drive the pin assignment and orientation directly instead of
> calling it from the port manager layer. To get there I need to add the
> ability for a 'struct typec_mux_dev' to associate with more than one
> typec_port (technically already done) and then make sure that the
> cros_ec_typec driver doesn't try to enable DP altmode on the type-c port
> that isn't muxed for DP. I'm working on this now but I'm sending this
> out to get some feedback because I've reached a good stopping place.
>

I've done this now, and it works well. I've extended the usb-switch.yaml
file to support a third graph endpoint for DP. And I've moved the hpd
notifying and lane remapping to be internal to the drm_dp_typec_bridge
code so that any device that registers the auxiliary device can follow
the usb-switch binding and connect the endpoint to the usb-c-connector
to get hpd notifications and pin assignment basically for free.

I'll send a v3 next week.