linux-kernel - [PATCH 5.19 122/155] usb: typec: tcpm: Return ENOTSUPP for power supply prop writes

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Message-Id: <20220906132834.608913555@linuxfoundation.org>
Date:   Tue,  6 Sep 2022 15:31:10 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org,
        Heikki Krogerus <heikki.krogerus@...ux.intel.com>,
        Badhri Jagan Sridharan <badhri@...gle.com>
Subject: [PATCH 5.19 122/155] usb: typec: tcpm: Return ENOTSUPP for power supply prop writes

From: Badhri Jagan Sridharan <badhri@...gle.com>

commit f2d38edc5e3375e56b4a30d5b66cefd385a2b38c upstream.

When the port does not support USB PD, prevent transition to PD
only states when power supply property is written. In this case,
TCPM transitions to SNK_NEGOTIATE_CAPABILITIES
which should not be the case given that the port is not pd_capable.

[   84.308251] state change SNK_READY -> SNK_NEGOTIATE_CAPABILITIES [rev3 NONE_AMS]
[   84.308335] Setting usb_comm capable false
[   84.323367] set_auto_vbus_discharge_threshold mode:3 pps_active:n vbus:5000 ret:0
[   84.323376] state change SNK_NEGOTIATE_CAPABILITIES -> SNK_WAIT_CAPABILITIES [rev3 NONE_AMS]

Fixes: e9e6e164ed8f6 ("usb: typec: tcpm: Support non-PD mode")
Cc: stable@...r.kernel.org
Reviewed-by: Heikki Krogerus <heikki.krogerus@...ux.intel.com>
Signed-off-by: Badhri Jagan Sridharan <badhri@...gle.com>
Link: https://lore.kernel.org/r/20220817215410.1807477-1-badhri@google.com
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 drivers/usb/typec/tcpm/tcpm.c |    7 +++++++
 1 file changed, 7 insertions(+)

--- a/drivers/usb/typec/tcpm/tcpm.c
+++ b/drivers/usb/typec/tcpm/tcpm.c
@@ -6191,6 +6191,13 @@ static int tcpm_psy_set_prop(struct powe
 	struct tcpm_port *port = power_supply_get_drvdata(psy);
 	int ret;
 
+	/*
+	 * All the properties below are related to USB PD. The check needs to be
+	 * property specific when a non-pd related property is added.
+	 */
+	if (!port->pd_supported)
+		return -EOPNOTSUPP;
+
 	switch (psp) {
 	case POWER_SUPPLY_PROP_ONLINE:
 		ret = tcpm_psy_set_online(port, val);