linux-kernel - [PATCH v3] usb: typec: ucsi: psy: Set max current to zero when disconnected

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Message-ID: <20251106011446.2052583-1-jthies@google.com>
Date: Thu,  6 Nov 2025 01:14:46 +0000
From: Jameson Thies <jthies@...gle.com>
To: heikki.krogerus@...ux.intel.com, linux-usb@...r.kernel.org, 
	linux-kernel@...r.kernel.org
Cc: dmitry.baryshkov@....qualcomm.com, bleung@...omium.org, 
	gregkh@...uxfoundation.org, akuchynski@...omium.org, 
	abhishekpandit@...omium.org, sebastian.reichel@...labora.com, kenny@...ix.com, 
	linux-pm@...r.kernel.org, stable@...r.kernel.org, 
	Jameson Thies <jthies@...gle.com>
Subject: [PATCH v3] usb: typec: ucsi: psy: Set max current to zero when disconnected

The ucsi_psy_get_current_max function defaults to 0.1A when it is not
clear how much current the partner device can support. But this does
not check the port is connected, and will report 0.1A max current when
nothing is connected. Update ucsi_psy_get_current_max to report 0A when
there is no connection.

Fixes: af833e7f7db3 ("usb: typec: ucsi: psy: Set current max to 100mA for BC 1.2 and Default")
Cc: stable@...r.kernel.org
Signed-off-by: Jameson Thies <jthies@...gle.com>
Reviewed-by: Benson Leung <bleung@...omium.org>
Reviewed-by: Heikki Krogerus <heikki.krogerus@...ux.intel.com>
Reviewed-by: Sebastian Reichel <sebastian.reichel@...labora.com>
Tested-by: Kenneth R. Crudup <kenny@...ix.com>
---

v3 changes:
- change log moved under "--"

v2 changes:
 - added cc stable tag to commit message

 drivers/usb/typec/ucsi/psy.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/drivers/usb/typec/ucsi/psy.c b/drivers/usb/typec/ucsi/psy.c
index 2b0225821502..3abe9370ffaa 100644
--- a/drivers/usb/typec/ucsi/psy.c
+++ b/drivers/usb/typec/ucsi/psy.c
@@ -169,6 +169,11 @@ static int ucsi_psy_get_current_max(struct ucsi_connector *con,
 {
 	u32 pdo;
 
+	if (!UCSI_CONSTAT(con, CONNECTED)) {
+		val->intval = 0;
+		return 0;
+	}
+
 	switch (UCSI_CONSTAT(con, PWR_OPMODE)) {
 	case UCSI_CONSTAT_PWR_OPMODE_PD:
 		if (con->num_pdos > 0) {

base-commit: 18514fd70ea4ca9de137bb3bceeac1bac4bcad75
-- 
2.51.2.1041.gc1ab5b90ca-goog