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If a device frequently NAKs, it can exhaust the scheduled handshakes in a frame. It will then not get polled by the controller until the next frame interval. This is most noticeable on FS devices as the controller schedules a small set of transactions only once per full-speed frame. Setting the ENH_PER_NAK_FS/LS bits in the GUCTL1 register increases the number of transactions that can be scheduled to Async (Control/Bulk) endpoints in the respective frame time. In the FS case, this only applies to FS devices directly connected to root ports. Signed-off-by: Jonathan Bell <jonathan@raspberrypi.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.
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