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313d1b9f63
According to the "6.4 Transfer Request Block (TRB)" in xHCI Specification, the max transfer length of a TRB is 64KB. However, on Rockchip platforms which support xHCI in DWC3 IP have problem if transfer more then 4KB in one TRB. We don't know the root cause, maybe it's the DWC3 Tx/Rx FIFO related, such as RK3399, it only support Tx FIFO 4136 Bytes and Rx FIFO 3072 Bytes for SS Bus instance. With the patch, it can make the xHCI transfer more stable on Rockchip platforms, but it also cause transfer performance loss. I test on RK3399 EVB Type-C USB 3.0 port with UAS USB 3.0 SSD, it cause 10% performance loss when use dd command to read/ write the UAS USB 3.0 SSD (350MBps -> 315MBps). Change-Id: I11b10f6618d54d4cb0a778e5c0b4216227184e47 Signed-off-by: William Wu <william.wu@rock-chips.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.
See Documentation/00-INDEX for a list of what is contained in each file.
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.