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After a reset event, the device automatically triggers ATI at the default core clock frequency (16 MHz). Soon afterward, the driver loads firmware which may attempt to lower the frequency. If this initial ATI cycle is still in progress when the frequency is changed, however, the device incorrectly reports channels 0, 1 and 2 to be in a state of touch once ATI finally completes. To solve this problem, wait until ATI is complete before lowering the frequency. Because this particular ATI cycle occurs following a reset event, its duration is predictable and a simple delay can suffice. Signed-off-by: Jeff LaBundy <jeff@labundy.com> Signed-off-by: Lee Jones <lee.jones@linaro.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.