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Subject[PATCH v1] usb: typec: tcpm: Ignore CC and vbus changes in PORT_RESET change
From
After PORT_RESET, the port is set to the appropriate
default_state. Ignore processing CC changes here as this
could cause the port to be switched into sink states
by default.

echo source > /sys/class/typec/port0/port_type

Before:
[ 154.528547] pending state change PORT_RESET -> PORT_RESET_WAIT_OFF @ 100 ms
[ 154.528560] CC1: 0 -> 0, CC2: 3 -> 0 [state PORT_RESET, polarity 0, disconnected]
[ 154.528564] state change PORT_RESET -> SNK_UNATTACHED

After:
[ 151.068814] pending state change PORT_RESET -> PORT_RESET_WAIT_OFF @ 100 ms [rev3 NONE_AMS]
[ 151.072440] CC1: 3 -> 0, CC2: 0 -> 0 [state PORT_RESET, polarity 0, disconnected]
[ 151.172117] state change PORT_RESET -> PORT_RESET_WAIT_OFF [delayed 100 ms]
[ 151.172136] pending state change PORT_RESET_WAIT_OFF -> SRC_UNATTACHED @ 870 ms [rev3 NONE_AMS]
[ 152.060106] state change PORT_RESET_WAIT_OFF -> SRC_UNATTACHED [delayed 870 ms]
[ 152.060118] Start toggling

Signed-off-by: Badhri Jagan Sridharan <badhri@google.com>
---
drivers/usb/typec/tcpm/tcpm.c | 26 ++++++++++++++++++++++++++
1 file changed, 26 insertions(+)

diff --git a/drivers/usb/typec/tcpm/tcpm.c b/drivers/usb/typec/tcpm/tcpm.c
index de3576e6530ab2..82b19ebd7838e0 100644
--- a/drivers/usb/typec/tcpm/tcpm.c
+++ b/drivers/usb/typec/tcpm/tcpm.c
@@ -3794,6 +3794,14 @@ static void _tcpm_cc_change(struct tcpm_port *port, enum typec_cc_status cc1,
*/
break;

+ case PORT_RESET:
+ case PORT_RESET_WAIT_OFF:
+ /*
+ * State set back to default mode once the timer completes.
+ * Ignore CC changes here.
+ */
+ break;
+
default:
if (tcpm_port_is_disconnected(port))
tcpm_set_state(port, unattached_state(port), 0);
@@ -3855,6 +3863,15 @@ static void _tcpm_pd_vbus_on(struct tcpm_port *port)
case SRC_TRY_DEBOUNCE:
/* Do nothing, waiting for sink detection */
break;
+
+ case PORT_RESET:
+ case PORT_RESET_WAIT_OFF:
+ /*
+ * State set back to default mode once the timer completes.
+ * Ignore vbus changes here.
+ */
+ break;
+
default:
break;
}
@@ -3908,10 +3925,19 @@ static void _tcpm_pd_vbus_off(struct tcpm_port *port)
case PORT_RESET_WAIT_OFF:
tcpm_set_state(port, tcpm_default_state(port), 0);
break;
+
case SRC_TRY_WAIT:
case SRC_TRY_DEBOUNCE:
/* Do nothing, waiting for sink detection */
break;
+
+ case PORT_RESET:
+ /*
+ * State set back to default mode once the timer completes.
+ * Ignore vbus changes here.
+ */
+ break;
+
default:
if (port->pwr_role == TYPEC_SINK &&
port->attached)
--
2.26.0.292.g33ef6b2f38-goog
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