linux-kernel - [PATCH v3 7/7] platform/chrome: cros_ec

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Message-ID: <20241107112955.v3.7.Ic14738918e3d026fa2d85e95fb68f8e07a0828d0@changeid>
Date: Thu,  7 Nov 2024 11:30:00 -0800
From: Abhishek Pandit-Subedi <abhishekpandit@...omium.org>
To: heikki.krogerus@...ux.intel.com,
	tzungbi@...nel.org,
	linux-usb@...r.kernel.org,
	chrome-platform@...ts.linux.dev
Cc: jthies@...gle.com,
	akuchynski@...gle.com,
	pmalani@...omium.org,
	dmitry.baryshkov@...aro.org,
	Abhishek Pandit-Subedi <abhishekpandit@...omium.org>,
	Benson Leung <bleung@...omium.org>,
	Guenter Roeck <groeck@...omium.org>,
	linux-kernel@...r.kernel.org
Subject: [PATCH v3 7/7] platform/chrome: cros_ec_typec: Disable tbt on port

Altmodes with cros_ec are either automatically entered by the EC or
entered by the AP if TBT or USB4 are supported on the system. Due to the
security risk of PCIe tunneling, TBT modes should not be auto entered by
the kernel at this time and will require user intervention.

With this change, a userspace program will need to explicitly activate
the thunderbolt mode on the port and partner in order to enter the mode
and the thunderbolt driver will not automatically enter when a partner
is connected.

Signed-off-by: Abhishek Pandit-Subedi <abhishekpandit@...omium.org>
---

Changes in v3:
- Set port.inactive = true instead of auto-enter.

Changes in v2:
- Only disable auto-enter for Thunderbolt
- Update commit message to clearly indicate the need for userspace
  intervention to enter TBT mode

 drivers/platform/chrome/cros_ec_typec.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/platform/chrome/cros_ec_typec.c b/drivers/platform/chrome/cros_ec_typec.c
index 558b618df63c..b01efe82fb1e 100644
--- a/drivers/platform/chrome/cros_ec_typec.c
+++ b/drivers/platform/chrome/cros_ec_typec.c
@@ -310,6 +310,7 @@ static int cros_typec_register_port_altmodes(struct cros_typec_data *typec,
 		memset(&desc, 0, sizeof(desc));
 		desc.svid = USB_TYPEC_TBT_SID;
 		desc.mode = TBT_MODE;
+		desc.inactive = true;
 		amode = cros_typec_register_thunderbolt(port, &desc);
 		if (IS_ERR(amode))
 			return PTR_ERR(amode);
-- 
2.47.0.277.g8800431eea-goog