From: Hans Verkuil <hans.verkuil@xxxxxxxxx>
Even when the CEC device is unconfigured due to an invalid physical
address it is still allowed to send a message from 0xf (Unregistered)
to 0 (TV). This is a corner case explicitly allowed by the CEC specification.
Document this corner case.
Signed-off-by: Hans Verkuil <hans.verkuil@xxxxxxxxx>
---
Documentation/media/uapi/cec/cec-ioc-receive.rst | 14 ++++++++++++++
1 file changed, 14 insertions(+)
diff --git a/Documentation/media/uapi/cec/cec-ioc-receive.rst b/Documentation/media/uapi/cec/cec-ioc-receive.rst
index 3ce7307f55fa..267044f7ac30 100644
--- a/Documentation/media/uapi/cec/cec-ioc-receive.rst
+++ b/Documentation/media/uapi/cec/cec-ioc-receive.rst
@@ -69,6 +69,18 @@ The ``sequence`` field is filled in for every transmit and this can be
checked against the received messages to find the corresponding transmit
result.
+Normally calling :ref:`ioctl CEC_TRANSMIT <CEC_TRANSMIT>` when the physical
+address is invalid (due to e.g. a disconnect) will return ``ENONET``.
+
+However, the CEC specification allows sending messages from 'Unregistered' to
+'TV' when the physical address is invalid since some TVs pull the hotplug detect
+pin of the HDMI connector low when they go into standby, or when switching to
+another input.
+
+When the hotplug detect pin goes low the EDID disappears, and thus the
+physical address, but the cable is still connected and CEC still works.
+In order to detect/wake up the device it is allowed to send poll and 'Image/Text
+View On' messages from initiator 0xf ('Unregistered') to destination 0 ('TV').
.. tabularcolumns:: |p{1.0cm}|p{3.5cm}|p{13.0cm}|
@@ -315,6 +327,8 @@ EPERM
ENONET
The CEC adapter is not configured, i.e. :ref:`ioctl CEC_ADAP_S_LOG_ADDRS <CEC_ADAP_S_LOG_ADDRS>`
was called, but the physical address is invalid so no logical address was claimed.
+ An exception is made in this case for transmits from initiator 0xf ('Unregistered')
+ to destination 0 ('TV'). In that case the transmit will proceed as usual.
EBUSY
Another filehandle is in exclusive follower or initiator mode, or the filehandle
--
2.11.0
