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media: vivid: add signal-free time for cec message xfer

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Currently, the vivid emulation of cec message transmission does not force
adapters to wait until the cec bus has been signal-free for a certain
number of bit periods before transmitting or re-transmitting a message.
Without enforcing the signal-free time requirements, adapters do not share
the bus very well and some messages are sent too quickly while other
messages are lost. By emulating a signal-free time and forcing adapters
to wait their turn to transmit, the vivid emulation of cec transmission
is much more reliable.

Signed-off-by: Deborah Brouwer <deborahbrouwer3563@gmail.com>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
This commit is contained in:
Deborah Brouwer 2021-08-26 05:44:11 +02:00 • committed by Mauro Carvalho Chehab
commit c6c709ee55
4 changed files with 219 additions and 192 deletions
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