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media: vidioc-prepare-buf.rst: drop reference to NO_CACHE flags

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This was never implemented, so do not document this.

Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>
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Hans Verkuil 2019-01-16 09:46:26 -02:00 committed by Mauro Carvalho Chehab
parent 04ee6d614c
commit 07b8fd8655
1 changed files with 1 additions and 4 deletions
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Documentation/media/uapi/v4l/vidioc-prepare-buf.rst
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@ -43,10 +43,7 @@ Applications can optionally call the :ref:`VIDIOC_PREPARE_BUF` ioctl to
pass ownership of the buffer to the driver before actually enqueuing it, pass ownership of the buffer to the driver before actually enqueuing it,
using the :ref:`VIDIOC_QBUF <VIDIOC_QBUF>` ioctl, and to prepare it for future I/O. Such using the :ref:`VIDIOC_QBUF <VIDIOC_QBUF>` ioctl, and to prepare it for future I/O. Such
preparations may include cache invalidation or cleaning. Performing them preparations may include cache invalidation or cleaning. Performing them
in advance saves time during the actual I/O. In case such cache in advance saves time during the actual I/O.
operations are not required, the application can use one of
``V4L2_BUF_FLAG_NO_CACHE_INVALIDATE`` and
``V4L2_BUF_FLAG_NO_CACHE_CLEAN`` flags to skip the respective step.
The struct :c:type:`v4l2_buffer` structure is specified in The struct :c:type:`v4l2_buffer` structure is specified in
:ref:`buffer`. :ref:`buffer`.