3a85482478
The i.MX media drivers implement a legacy video node API, where the format of the video node is influenced by the active format of the connected subdev (both for enumeration and for the get, set and try format ioctls), and where controls exposed by the subdevs in the pipeline are inherited by the video node. At the same time, the drivers implement the media controller API and expose subdev video nodes to userspace. Those two modes of operation are incompatible and should not be exposed together. Furthermore, the legacy API gets in the way of proper enumeration of pixel formats on the video node, as it prevents compliance with the V4L2 specification. As a first step towards fixing this, rename all V4L2 video node ioctl handlers with a legacy prefix. This will allow implementing a new set of ioctls in parallel and gradually switching drivers. Add a task to the TODO file for the removal of the legacy API. Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Reviewed-by: Rui Miguel Silva <rmfrfs@gmail.com> Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl> Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.