[PATCH 4/8] usb: typec: fusb302: Check vconn is off when we start toggling

[Hans de Goede]

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_ON check to catch any cases where vconn is not off
for some reason.

Signed-off-by: Hans de Goede <hdego...@redhat.com>
---
 drivers/usb/typec/tcpm/fusb302.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/usb/typec/tcpm/fusb302.c b/drivers/usb/typec/tcpm/fusb302.c
index 4e75526b3874..f83e777aeabf 100644
--- 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_ON(chip->vconn_on);
                /* unmask TOGDONE interrupt */
                ret = fusb302_i2c_clear_bits(chip, FUSB_REG_MASKA,
                                             FUSB_REG_MASKA_TOGDONE);
-- 
2.20.1