diff options
| author | Badhri Jagan Sridharan <badhri@google.com> | 2023-10-15 08:31:08 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2023-10-21 13:52:53 +0300 |
| commit | 1a4a2df07c1f087704c24282cebe882268e38146 (patch) | |
| tree | d90cc7a690e6f8da21cacb1fef3ad8d49a269f3d /drivers/usb | |
| parent | bbd3778da16b3d448832b843f80bcde1aff26290 (diff) | |
| download | linux-1a4a2df07c1f087704c24282cebe882268e38146.tar.xz | |
usb: typec: tcpm: Add additional checks for contaminant
When transitioning from SNK_DEBOUNCED to unattached, its worthwhile to
check for contaminant to mitigate wakeups.
```
[81334.219571] Start toggling
[81334.228220] CC1: 0 -> 0, CC2: 0 -> 0 [state TOGGLING, polarity 0, disconnected]
[81334.305147] CC1: 0 -> 0, CC2: 0 -> 3 [state TOGGLING, polarity 0, connected]
[81334.305162] state change TOGGLING -> SNK_ATTACH_WAIT [rev3 NONE_AMS]
[81334.305187] pending state change SNK_ATTACH_WAIT -> SNK_DEBOUNCED @ 170 ms [rev3 NONE_AMS]
[81334.475515] state change SNK_ATTACH_WAIT -> SNK_DEBOUNCED [delayed 170 ms]
[81334.486480] CC1: 0 -> 0, CC2: 3 -> 0 [state SNK_DEBOUNCED, polarity 0, disconnected]
[81334.486495] state change SNK_DEBOUNCED -> SNK_DEBOUNCED [rev3 NONE_AMS]
[81334.486515] pending state change SNK_DEBOUNCED -> SNK_UNATTACHED @ 20 ms [rev3 NONE_AMS]
[81334.506621] state change SNK_DEBOUNCED -> SNK_UNATTACHED [delayed 20 ms]
[81334.506640] Start toggling
[81334.516972] CC1: 0 -> 0, CC2: 0 -> 0 [state TOGGLING, polarity 0, disconnected]
[81334.592759] CC1: 0 -> 0, CC2: 0 -> 3 [state TOGGLING, polarity 0, connected]
[81334.592773] state change TOGGLING -> SNK_ATTACH_WAIT [rev3 NONE_AMS]
[81334.592792] pending state change SNK_ATTACH_WAIT -> SNK_DEBOUNCED @ 170 ms [rev3 NONE_AMS]
[81334.762940] state change SNK_ATTACH_WAIT -> SNK_DEBOUNCED [delayed 170 ms]
[81334.773557] CC1: 0 -> 0, CC2: 3 -> 0 [state SNK_DEBOUNCED, polarity 0, disconnected]
[81334.773570] state change SNK_DEBOUNCED -> SNK_DEBOUNCED [rev3 NONE_AMS]
[81334.773588] pending state change SNK_DEBOUNCED -> SNK_UNATTACHED @ 20 ms [rev3 NONE_AMS]
[81334.793672] state change SNK_DEBOUNCED -> SNK_UNATTACHED [delayed 20 ms]
[81334.793681] Start toggling
[81334.801840] CC1: 0 -> 0, CC2: 0 -> 0 [state TOGGLING, polarity 0, disconnected]
[81334.878655] CC1: 0 -> 0, CC2: 0 -> 3 [state TOGGLING, polarity 0, connected]
[81334.878672] state change TOGGLING -> SNK_ATTACH_WAIT [rev3 NONE_AMS]
[81334.878696] pending state change SNK_ATTACH_WAIT -> SNK_DEBOUNCED @ 170 ms [rev3 NONE_AMS]
[81335.048968] state change SNK_ATTACH_WAIT -> SNK_DEBOUNCED [delayed 170 ms]
[81335.060684] CC1: 0 -> 0, CC2: 3 -> 0 [state SNK_DEBOUNCED, polarity 0, disconnected]
[81335.060754] state change SNK_DEBOUNCED -> SNK_DEBOUNCED [rev3 NONE_AMS]
[81335.060775] pending state change SNK_DEBOUNCED -> SNK_UNATTACHED @ 20 ms [rev3 NONE_AMS]
[81335.080884] state change SNK_DEBOUNCED -> SNK_UNATTACHED [delayed 20 ms]
[81335.080900] Start toggling
```
Cc: stable@vger.kernel.org
Fixes: 599f008c257d ("usb: typec: tcpm: Add callbacks to mitigate wakeups due to contaminant")
Signed-off-by: Badhri Jagan Sridharan <badhri@google.com>
Acked-by: Heikki Krogerus <heikki.krogerus@linux.intel.com>
Link: https://lore.kernel.org/r/20231015053108.2349570-1-badhri@google.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/usb')
| -rw-r--r-- | drivers/usb/typec/tcpm/tcpm.c | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/drivers/usb/typec/tcpm/tcpm.c b/drivers/usb/typec/tcpm/tcpm.c index 6e843c511b85..1c7e8dc5282d 100644 --- a/drivers/usb/typec/tcpm/tcpm.c +++ b/drivers/usb/typec/tcpm/tcpm.c @@ -3903,6 +3903,8 @@ static void run_state_machine(struct tcpm_port *port) port->potential_contaminant = ((port->enter_state == SRC_ATTACH_WAIT && port->state == SRC_UNATTACHED) || (port->enter_state == SNK_ATTACH_WAIT && + port->state == SNK_UNATTACHED) || + (port->enter_state == SNK_DEBOUNCED && port->state == SNK_UNATTACHED)); port->enter_state = port->state; |