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e876f34adc
USB4 spec allows DP tunneling from any router that has DP IN adapter, not just from host router. The driver currently only added the DP IN resources for the host router because Thunderbolt 1, 2 and 3 devices do not have DP IN adapters. However, USB4 allows device routers to have DP IN adapter as well so update the driver to add DP IN resources for each device that has one. One example would be an eGPU enclosure where the eGPU output is forwarded to DP IN port and then tunneled over the USB4 fabric. Only limitation we add now is that the DP IN and DP OUT that gets paired for tunnel creation should both be under the same topology starting from host router downstream port. In other words we do not create DP tunnels across host router at this time even though that is possible as well but it complicates the bandwidth management and there is no real use-case for this anyway. Signed-off-by: Mika Westerberg <mika.westerberg@linux.intel.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.