diff options
| -rw-r--r-- | Documentation/driver-api/media/cec-core.rst | 9 |
1 files changed, 6 insertions, 3 deletions
diff --git a/Documentation/driver-api/media/cec-core.rst b/Documentation/driver-api/media/cec-core.rst index 56345eae9a26..c6194ee81c41 100644 --- a/Documentation/driver-api/media/cec-core.rst +++ b/Documentation/driver-api/media/cec-core.rst @@ -130,9 +130,12 @@ To enable/disable the hardware:: int (*adap_enable)(struct cec_adapter *adap, bool enable); This callback enables or disables the CEC hardware. Enabling the CEC hardware -means powering it up in a state where no logical addresses are claimed. This -op assumes that the physical address (adap->phys_addr) is valid when enable is -true and will not change while the CEC adapter remains enabled. The initial +means powering it up in a state where no logical addresses are claimed. The +physical address will always be valid if CEC_CAP_NEEDS_HPD is set. If that +capability is not set, then the physical address can change while the CEC +hardware is enabled. CEC drivers should not set CEC_CAP_NEEDS_HPD unless +the hardware design requires that as this will make it impossible to wake +up displays that pull the HPD low when in standby mode. The initial state of the CEC adapter after calling cec_allocate_adapter() is disabled. Note that adap_enable must return 0 if enable is false. |