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Diffstat (limited to 'Documentation/media/kapi/cec-core.rst')
| -rw-r--r-- | Documentation/media/kapi/cec-core.rst | 9 |
1 files changed, 8 insertions, 1 deletions
diff --git a/Documentation/media/kapi/cec-core.rst b/Documentation/media/kapi/cec-core.rst index a9f53f069a2d..bca1d9d1d223 100644 --- a/Documentation/media/kapi/cec-core.rst +++ b/Documentation/media/kapi/cec-core.rst @@ -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. @@ -265,6 +268,10 @@ to 1, if the hardware does support retry then either set these counters to 0 if the hardware provides no feedback of which errors occurred and how many times, or fill in the correct values as reported by the hardware. +Be aware that calling these functions can immediately start a new transmit +if there is one pending in the queue. So make sure that the hardware is in +a state where new transmits can be started *before* calling these functions. + The cec_transmit_attempt_done() function is a helper for cases where the hardware never retries, so the transmit is always for just a single attempt. It will call cec_transmit_done() in turn, filling in 1 for the |