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Sat, 14 Oct 2023 22:15:42 -0700 (PDT) Date: Sun, 15 Oct 2023 05:15:38 +0000 Mime-Version: 1.0 X-Mailer: git-send-email 2.42.0.655.g421f12c284-goog Message-ID: <20231015051538.2344565-1-badhri@google.com> Subject: [PATCH v1] usb: typec: tcpm: Add additional checks for contaminant From: Badhri Jagan Sridharan To: gregkh@linuxfoundation.org, linux@roeck-us.net, heikki.krogerus@linux.intel.com Cc: kyletso@google.com, linux-usb@vger.kernel.org, linux-kernel@vger.kernel.org, rdbabiera@google.com, amitsd@google.com, stable@vger.kernel.org, Badhri Jagan Sridharan Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" 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, discon= nected] [81334.305147] CC1: 0 -> 0, CC2: 0 -> 3 [state TOGGLING, polarity 0, connec= ted] [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 m= s] [81334.486480] CC1: 0 -> 0, CC2: 3 -> 0 [state SNK_DEBOUNCED, polarity 0, d= isconnected] [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, discon= nected] [81334.592759] CC1: 0 -> 0, CC2: 0 -> 3 [state TOGGLING, polarity 0, connec= ted] [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 m= s] [81334.773557] CC1: 0 -> 0, CC2: 3 -> 0 [state SNK_DEBOUNCED, polarity 0, d= isconnected] [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, discon= nected] [81334.878655] CC1: 0 -> 0, CC2: 0 -> 3 [state TOGGLING, polarity 0, connec= ted] [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 m= s] [81335.060684] CC1: 0 -> 0, CC2: 3 -> 0 [state SNK_DEBOUNCED, polarity 0, d= isconnected] [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: 00bdc7e4e0f56 ("usb: typec: tcpm: Add callbacks to mitigate wakeups = due to contaminant") Signed-off-by: Badhri Jagan Sridharan --- drivers/usb/typec/tcpm/tcpm.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) diff --git a/drivers/usb/typec/tcpm/tcpm.c b/drivers/usb/typec/tcpm/tcpm.c index 6e843c511b85..3634f9092a84 100644 --- a/drivers/usb/typec/tcpm/tcpm.c +++ b/drivers/usb/typec/tcpm/tcpm.c @@ -3903,7 +3903,9 @@ static void run_state_machine(struct tcpm_port *port) port->potential_contaminant =3D ((port->enter_state =3D=3D SRC_ATTACH_WA= IT && port->state =3D=3D SRC_UNATTACHED) || (port->enter_state =3D=3D SNK_ATTACH_WAIT && - port->state =3D=3D SNK_UNATTACHED)); + port->state =3D=3D SNK_UNATTACHED) || + (port->enter_state =3D=3D SNK_DEBOUNCED && + port->state =3D=3D SNK_UNATTACHED)); =20 port->enter_state =3D port->state; switch (port->state) { base-commit: 1034cc423f1b4a7a9a56d310ca980fcd2753e11d --=20 2.42.0.655.g421f12c284-goog