diff options
Diffstat (limited to 'drivers/usb')
| -rw-r--r-- | drivers/usb/typec/tcpm/tcpm.c | 18 |
1 files changed, 18 insertions, 0 deletions
diff --git a/drivers/usb/typec/tcpm/tcpm.c b/drivers/usb/typec/tcpm/tcpm.c index 36b6ce85093f..6326a8f2e1d9 100644 --- a/drivers/usb/typec/tcpm/tcpm.c +++ b/drivers/usb/typec/tcpm/tcpm.c @@ -4804,6 +4804,24 @@ 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) |