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[media] cec: ignore messages that we initiated
Some CEC adapters will receive messages that they initiated. Add a check that will ignore such messages. Most hardware behaves correctly in this respect, but I have seen adapters that don't, so just filter this out in the framework. Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com> Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
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@ -869,6 +869,21 @@ void cec_received_msg(struct cec_adapter *adap, struct cec_msg *msg)
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if (WARN_ON(!msg->len || msg->len > CEC_MAX_MSG_SIZE))
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return;
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/*
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* Some CEC adapters will receive the messages that they transmitted.
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* This test filters out those messages by checking if we are the
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* initiator, and just returning in that case.
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*
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* Note that this won't work if this is an Unregistered device.
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*
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* It is bad practice if the hardware receives the message that it
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* transmitted and luckily most CEC adapters behave correctly in this
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* respect.
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*/
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if (msg_init != CEC_LOG_ADDR_UNREGISTERED &&
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cec_has_log_addr(adap, msg_init))
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return;
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msg->rx_ts = ktime_get_ns();
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msg->rx_status = CEC_RX_STATUS_OK;
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msg->sequence = msg->reply = msg->timeout = 0;
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