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| author | Hans Verkuil <hverkuil-cisco@xs4all.nl> | 2021-06-28 11:23:49 +0300 |
|---|---|---|
| committer | Mauro Carvalho Chehab <mchehab+huawei@kernel.org> | 2021-07-22 15:01:55 +0300 |
| commit | 7910c23d704794461aba7a72b07aae582496b781 (patch) | |
| tree | f8001dbcc8bcb2b806ccaec3b98aebd40d4caf79 /Documentation/driver-api | |
| parent | f003d635a8aede9d0e44fb1255ff63a1b2d7eb6e (diff) | |
| download | linux-7910c23d704794461aba7a72b07aae582496b781.tar.xz | |
media: media/cec-core.rst: update adap_enable doc
The description of adap_enable was out-of-date.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>
Diffstat (limited to 'Documentation/driver-api')
| -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. |