usb: typec: fusb302: Check vconn is off when we start toggling

The datasheet says the vconn MUST be off when we start toggling. The
tcpm.c state-machine is responsible to make sure vconn is off, but lets
add a WARN to catch any cases where vconn is not off for some reason.

Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Acked-by: Heikki Krogerus <heikki.krogerus@linux.intel.com>
Reviewed-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/usb/typec/tcpm/fusb302.c b/drivers/usb/typec/tcpm/fusb302.c
index cb6637e..416b2dd 100644 (file)
--- a/drivers/usb/typec/tcpm/fusb302.c
+++ b/drivers/usb/typec/tcpm/fusb302.c
@@ -607,6 +607,8 @@ static int fusb302_set_toggling(struct fusb302_chip *chip,
                        return ret;
                chip->intr_togdone = false;
        } else {
+               /* Datasheet says vconn MUST be off when toggling */
+               WARN(chip->vconn_on, "Vconn is on during toggle start");
                /* unmask TOGDONE interrupt */
                ret = fusb302_i2c_clear_bits(chip, FUSB_REG_MASKA,
                                             FUSB_REG_MASKA_TOGDONE);