diff options
| author | Badhri Jagan Sridharan <badhri@google.com> | 2020-12-11 08:19:11 +0100 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2020-12-11 11:24:12 +0100 |
| commit | 3db4c21c0f71f7a51ce5c50f0d4d3742c9ec4a65 (patch) | |
| tree | bbcbd5eb37e62e9a295ad6c1136ae628e4844ac1 /drivers/usb | |
| parent | usb: typec: tcpci: Enable bleed discharge when auto discharge is enabled (diff) | |
| download | linux-3db4c21c0f71f7a51ce5c50f0d4d3742c9ec4a65.tar.xz linux-3db4c21c0f71f7a51ce5c50f0d4d3742c9ec4a65.zip | |
usb: typec: tcpm: Update vbus_vsafe0v on init
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.
Reviewed-by: Heikki Krogerus <heikki.krogerus@linux.intel.com>
Signed-off-by: Badhri Jagan Sridharan <badhri@google.com>
Link: https://lore.kernel.org/r/20201211071911.2205197-1-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 | 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) |