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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>