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This makes it possible to test the new CEC_MSG_FL_REPLY_VENDOR_ID flag. The vivid driver will Feature Abort any messages that do not have exactly 1 payload byte. It ignores messages where the payload byte is even, and where it is odd it will reply with the payload byte incremented by 1. Basically a simple ping-pong command. Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl> Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>