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The CSI module does not handle all the MIPI lane calibration procedure, leaving a small part of it to the VI module. In doing this, tegra_channel_enable_stream() (vi.c) manipulates the private data of the upstream subdev casting it to struct 'tegra_csi_channel', which will be wrong after introducing a VIP (parallel video input) channel. This prevents adding support for the VIP module. It also breaks the logical isolation between modules. Since the lane calibration requirement does not exist in the parallel input module, moving the calibration function to a per-module op is not optimal. Instead move the calibration procedure in the CSI module, together with the rest of the calibration procedures. After this change, tegra_channel_enable_stream() just calls v4l2_subdev_call() to ask for a stream start/stop to the CSI module, which in turn knows all the CSI-specific details to implement it. Signed-off-by: Luca Ceresoli <luca.ceresoli@bootlin.com> Reviewed-by: Dmitry Osipenko <digetx@gmail.com> Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
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.