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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@kernkonzept.com> Signed-off-by: Adam Lackorzynski <adam@l4re.org> [trini: Add VIRTIO_CONFIG_S_ACKNOWLEDGE flag check to the test] Signed-off-by: Tom Rini <trini@konsulko.com>