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Even when the CEC device is unconfigured due to an invalid physical address it is still allowed to send a message from 0xf (Unregistered) to 0 (TV). This is a corner case explicitly allowed by the CEC specification. Document this corner case. Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com> Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>