On 12/10/20 11:19 PM, Badhri Jagan Sridharan wrote: > During init, vbus_vsafe0v does not get updated till the first > connect as a sink. This causes TCPM to be stuck in SRC_ATTACH_WAIT > state while booting with a sink (For instance: a headset) connected. > > [ 1.429168] Start toggling > [ 1.439907] CC1: 0 -> 0, CC2: 0 -> 0 [state TOGGLING, polarity 0, > disconnected] > [ 1.445242] CC1: 0 -> 0, CC2: 0 -> 0 [state TOGGLING, polarity 0, > disconnected] > [ 53.358528] CC1: 0 -> 0, CC2: 0 -> 2 [state TOGGLING, polarity 0, > connected] > [ 53.358564] state change TOGGLING -> SRC_ATTACH_WAIT [rev1 NONE_AMS] > > Fix this by updating vbus_vsafe0v based on vbus_present status > on boot. > > Signed-off-by: Badhri Jagan Sridharan <bad...@google.com>
Reviewed-by: Guenter Roeck <li...@roeck-us.net> > --- > drivers/usb/typec/tcpm/tcpm.c | 18 ++++++++++++++++++ > 1 file changed, 18 insertions(+) > > diff --git a/drivers/usb/typec/tcpm/tcpm.c b/drivers/usb/typec/tcpm/tcpm.c > index cedc6cf82d61..58a6302c549f 100644 > --- a/drivers/usb/typec/tcpm/tcpm.c > +++ b/drivers/usb/typec/tcpm/tcpm.c > @@ -4794,6 +4794,24 @@ static void tcpm_init(struct tcpm_port *port) > if (port->vbus_present) > port->vbus_never_low = true; > > + /* > + * 1. When vbus_present is true, voltage on VBUS is already at VSAFE5V. > + * So implicitly vbus_vsafe0v = false. > + * > + * 2. When vbus_present is false and TCPC does NOT support querying > + * vsafe0v status, then, it's best to assume vbus is at VSAFE0V i.e. > + * vbus_vsafe0v is true. > + * > + * 3. When vbus_present is false and TCPC does support querying vsafe0v, > + * then, query tcpc for vsafe0v status. > + */ > + if (port->vbus_present) > + port->vbus_vsafe0v = false; > + else if (!port->tcpc->is_vbus_vsafe0v) > + port->vbus_vsafe0v = true; > + else > + port->vbus_vsafe0v = port->tcpc->is_vbus_vsafe0v(port->tcpc); > + > tcpm_set_state(port, tcpm_default_state(port), 0); > > if (port->tcpc->get_cc(port->tcpc, &cc1, &cc2) == 0) >
