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04ddfcdb71
The function uvc_ctrl_init_ctrl() is called for every control for every entity, but it exits early if the entity is a extension unit. The comment claims that this is done to avoid querying XU controls during probe. We only query a control if its entity GUIDs and index matches the uvc_ctrls list. There are only controls for the following GUIDs: UVC_GUID_UVC_PROCESSING, UVC_GUID_UVC_CAMERA and UVC_GUID_EXT_GPIO_CONTROLLER. In other words, XU controls will not be queried even without this condition. In future patches we want to add ChromeOS XU controls that need to the initialized. We will make sure that all cameras with ChromeOS XU can be queried at probe time. Signed-off-by: Ricardo Ribalda <ribalda@chromium.org> Reviewed-by: Hans de Goede <hansg@kernel.org> Signed-off-by: Hans de Goede <hansg@kernel.org> Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Signed-off-by: Hans Verkuil <hverkuil+cisco@kernel.org> |
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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 reStructuredText 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.