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    Subject[PATCH 5.13 641/800] usb: typec: tcpm: Fix up PR_SWAP when vsafe0v is signalled
    Date
    From: Badhri Jagan Sridharan <badhri@google.com>

    [ Upstream commit d112efbe6dbf7d4c482e2a3f381fa315aabfe63b ]

    During PR_SWAP, When TCPM is in PR_SWAP_SNK_SRC_SINK_OFF, vbus is
    expected to reach VSAFE0V when source turns off vbus. Do not move
    to SNK_UNATTACHED state when this happens.

    Fixes: 28b43d3d746b ("usb: typec: tcpm: Introduce vsafe0v for vbus")
    Reviewed-by: Guenter Roeck <linux@roeck-us.net>
    Acked-by: Heikki Krogerus <heikki.krogerus@linux.intel.com>
    Signed-off-by: Badhri Jagan Sridharan <badhri@google.com>
    Link: https://lore.kernel.org/r/20210517192112.40934-1-badhri@google.com
    Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
    Signed-off-by: Sasha Levin <sashal@kernel.org>
    ---
    drivers/usb/typec/tcpm/tcpm.c | 3 +++
    1 file changed, 3 insertions(+)

    diff --git a/drivers/usb/typec/tcpm/tcpm.c b/drivers/usb/typec/tcpm/tcpm.c
    index c67533191091..1b7f18d35df4 100644
    --- a/drivers/usb/typec/tcpm/tcpm.c
    +++ b/drivers/usb/typec/tcpm/tcpm.c
    @@ -5225,6 +5225,9 @@ static void _tcpm_pd_vbus_vsafe0v(struct tcpm_port *port)
    tcpm_set_state(port, SNK_UNATTACHED, 0);
    }
    break;
    + case PR_SWAP_SNK_SRC_SINK_OFF:
    + /* Do nothing, vsafe0v is expected during transition */
    + break;
    default:
    if (port->pwr_role == TYPEC_SINK && port->auto_vbus_discharge_enabled)
    tcpm_set_state(port, SNK_UNATTACHED, 0);
    --
    2.30.2


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