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media: cec: improve cec status documentation

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Clarify the description of status bits, particularly w.r.t. ERROR and NACK.

Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Hans Verkuil <hansverk@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>
This commit is contained in:
Hans Verkuil
2018-05-15 03:21:01 -04:00
committed by Mauro Carvalho Chehab
parent df2b238618
commit 6aecad6267
2 changed files with 19 additions and 10 deletions
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5
Documentation/media/kapi/cec-core.rst
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@@ -246,7 +246,10 @@ CEC_TX_STATUS_LOW_DRIVE:
CEC_TX_STATUS_ERROR:
some unspecified error occurred: this can be one of ARB_LOST
or LOW_DRIVE if the hardware cannot differentiate or something
else entirely.
else entirely. Some hardware only supports OK and FAIL as the
result of a transmit, i.e. there is no way to differentiate
between the different possible errors. In that case map FAIL
to CEC_TX_STATUS_NACK and not to CEC_TX_STATUS_ERROR.
CEC_TX_STATUS_MAX_RETRIES:
could not transmit the message after trying multiple times.