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[1/2] hw/i2c: smbus_slave: Reset state on reset

Message ID 20230320221419.2225561-2-komlodi@google.com
State New
Headers show
Series hw/i2c: Reset fixes | expand

Commit Message

Joe Komlodi March 20, 2023, 10:14 p.m. UTC 
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>
---
 hw/i2c/smbus_slave.c | 9 +++++++++
 1 file changed, 9 insertions(+)

Comments

Philippe Mathieu-Daudé March 21, 2023, 1:43 p.m. UTC | #1 
On 20/3/23 23:14, Joe Komlodi wrote:
> 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>
> ---
>   hw/i2c/smbus_slave.c | 9 +++++++++
>   1 file changed, 9 insertions(+)

Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
diff mbox series

Patch

diff --git a/hw/i2c/smbus_slave.c b/hw/i2c/smbus_slave.c
index feb3ec6333..7b9d8780ae 100644
--- a/hw/i2c/smbus_slave.c
+++ b/hw/i2c/smbus_slave.c
@@ -197,10 +197,19 @@  static int smbus_i2c_send(I2CSlave *s, uint8_t data)
     return 0;
 }
 
+static void smbus_device_enter_reset(Object *obj, ResetType type)
+{
+    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.enter = smbus_device_enter_reset;
     sc->event = smbus_i2c_event;
     sc->recv = smbus_i2c_recv;
     sc->send = smbus_i2c_send;