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Version 2.0 of the USB Power Delivery Specification R3.0 defines a new message called Enter_USB, which is made with USB4 in mind. Enter_USB message is in practice the same as the Enter Mode command (used when entering alternate modes) that just needs to be used when entering USB4 mode. The message does also support entering USB 2.0 or USB 3.2 mode instead of USB4 mode, but it is only required with USB4. I.e. with USB2 and USB3 Enter_USB message is optional. Signed-off-by: Heikki Krogerus <heikki.krogerus@linux.intel.com> Link: https://lore.kernel.org/r/20191230142611.24921-9-heikki.krogerus@linux.intel.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.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.