[PATCH v4 3/3] hw/i2c: smbus_slave: Reset state on reset

[Joe Komlodi <komlodi@google.com>]

If a reset comes while the SMBus device is not in its idle state, it's
possible for it to get confused on valid transactions post-reset.

Signed-off-by: Joe Komlodi <komlodi@google.com>
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
---
 hw/i2c/smbus_slave.c | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/hw/i2c/smbus_slave.c b/hw/i2c/smbus_slave.c
index 9f9afc25a4..4615e8b097 100644
--- a/hw/i2c/smbus_slave.c
+++ b/hw/i2c/smbus_slave.c
@@ -201,10 +201,19 @@ static int smbus_i2c_send(I2CSlave *s, uint8_t data)
     return 0;
 }
 
+static void smbus_device_hold_reset(Object *obj)
+{
+    SMBusDevice *dev = SMBUS_DEVICE(obj);
+    dev->mode = SMBUS_IDLE;
+    dev->data_len = 0;
+}
+
 static void smbus_device_class_init(ObjectClass *klass, void *data)
 {
     I2CSlaveClass *sc = I2C_SLAVE_CLASS(klass);
+    ResettableClass *rc = RESETTABLE_CLASS(klass);
 
+    rc->phases.hold = smbus_device_hold_reset;
     sc->event = smbus_i2c_event;
     sc->recv = smbus_i2c_recv;
     sc->send = smbus_i2c_send;
-- 
2.44.0.rc0.258.g7320e95886-goog