diff options
| author | Hans Verkuil <hans.verkuil@cisco.com> | 2017-06-07 11:46:12 -0300 |
|---|---|---|
| committer | Mauro Carvalho Chehab <mchehab@s-opensource.com> | 2017-06-20 06:54:34 -0300 |
| commit | f902c1e95d5dfe5102f8467d69dc51d505f832ee (patch) | |
| tree | 29e8d0abcd8b7c4d67cd69a7b46f0b4abc10bf34 /include/uapi/linux | |
| parent | 2613cc6fd32c4997d8e9473f8249601a5e088ee7 (diff) | |
[media] cec: add CEC_CAP_NEEDS_HPD
Add a new capability CEC_CAP_NEEDS_HPD. If this capability is set
then the hardware can only use CEC if the HDMI Hotplug Detect pin
is high. Such hardware cannot handle the corner case in the CEC specification
where it is possible to transmit messages even if no hotplug signal is
present (needed for some displays that turn off the HPD when in standby,
but still have CEC enabled).
Typically hardware that needs this capability have the HPD wired to the CEC
block, often to a 'power' or 'active' pin.
Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
Diffstat (limited to 'include/uapi/linux')
| -rw-r--r-- | include/uapi/linux/cec.h | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/include/uapi/linux/cec.h b/include/uapi/linux/cec.h index a0dfe27bc6c7..44579a24f95d 100644 --- a/include/uapi/linux/cec.h +++ b/include/uapi/linux/cec.h @@ -336,6 +336,8 @@ static inline int cec_is_unconfigured(__u16 log_addr_mask) #define CEC_CAP_RC (1 << 4) /* Hardware can monitor all messages, not just directed and broadcast. */ #define CEC_CAP_MONITOR_ALL (1 << 5) +/* Hardware can use CEC only if the HDMI HPD pin is high. */ +#define CEC_CAP_NEEDS_HPD (1 << 6) /** * struct cec_caps - CEC capabilities structure. |