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[ Upstream commita9635ef0ca] Pin C and D are used on C-to-C cable applications including docks, and for USB-C adapters that convert from DP over USB-C to other video standards. Pin Assignment E is intended to be used with adapter from USB-C to DP plugs or receptacles. All Chromebook USB-C DFPs support DisplayPort Alternate Mode as the DP Source with support for all 3 pin assignments. Pin Assignment E is required in order to support if the user attaches a Pin E C-to-DP cable. Without this, the displayport.c alt mode driver will error out of dp_altmode_probe with an -ENODEV, as it cannot find a compatible matching pin assignment between the DFP_D and UFP_D. Fixes:dbb3fc0ffa("platform/chrome: cros_ec_typec: Displayport support") Signed-off-by: Benson Leung <bleung@chromium.org> Reviewed-by: Jameson Thies <jthies@google.com> Reviewed-by: Abhishek Pandit-Subedi <abhishekpandit@chromium.org> Link: https://lore.kernel.org/r/20250428174828.13939-1-bleung@chromium.org Signed-off-by: Tzung-Bi Shih <tzungbi@kernel.org> Signed-off-by: Sasha Levin <sashal@kernel.org>
Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the reStructuredText markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.