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The driver doesn't set an initial video format until s_input is called: $ v4l2-ctl -d /dev/v4l-touch0 --get-input Video input : 0 (Normalized 16-Bit Image: ok) $ v4l2-ctl -d /dev/v4l-touch0 --get-fmt-video Width/Height : 0/0 Pixel Format : '' [...] $ v4l2-ctl -d /dev/v4l-touch0 --set-input 0 Video input set to 0 (Normalized 16-Bit Image: Touch, ok) $ v4l2-ctl -d /dev/v4l-touch0 --get-fmt-video Width/Height : 71/40 Pixel Format : 'TD16' [...] To fix this, initialize the video format to input 0 during probe. Signed-off-by: Philipp Zabel <p.zabel@pengutronix.de> Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
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.