[PATCH] virtio: Fix virtio initialization sequence

[Christian Pötzsch]

The virtio spec clearly states in "3.1.1 Driver Requirements: Device
Initialization" the sequence a client has to follow after device reset.
Because u-boot resets here again, it also needs to set the "acknowledge"
bit again even if this was done in virtio_uclass_child_post_bind already
once before.

Signed-off-by: Christian Pötzsch <christian.poetzsch at kernkonzept.com>
Signed-off-by: Adam Lackorzynski <adam at l4re.org>
---
 drivers/virtio/virtio-uclass.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/virtio/virtio-uclass.c b/drivers/virtio/virtio-uclass.c
index ac563991b90..c36e9e9b3a7 100644
--- a/drivers/virtio/virtio-uclass.c
+++ b/drivers/virtio/virtio-uclass.c
@@ -292,6 +292,9 @@ static int virtio_uclass_child_pre_probe(struct udevice *vdev)
 	if (ret)
 		goto err;
 
+	/* After a reset we always need to start the init sequence again */
+	virtio_add_status(vdev, VIRTIO_CONFIG_S_ACKNOWLEDGE);
+
 	/* We have a driver! */
 	virtio_add_status(vdev, VIRTIO_CONFIG_S_DRIVER);
 
-- 
2.51.0