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media: media/cec-core.rst: update adap_enable doc

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The description of adap_enable was out-of-date. Improve it so that it
corresponds to what really happens.

Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
This commit is contained in:
Hans Verkuil 2021-06-28 10:23:49 +02:00 committed by Mauro Carvalho Chehab
parent f003d635a8
commit 7910c23d70
1 changed files with 6 additions and 3 deletions
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9
Documentation/driver-api/media/cec-core.rst
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@ -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.