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The integrated USB2.0 hub in the VL805 chipset has a bug where it incorrectly determines the remaining available frame time before the host next sends a SOF packet with an incremented frame_number. See the USB2.0 specification sections 11.3 and 11.14.2.3. The hub's non-periodic TT handler can transmit the IN/OUT handshake token too late, so a following 64-byte DATA0/1 packet causes the ACK handshake to collide with the propagated SOF. This causes port babble. Avoid ringing doorbells for vulnerable endpoints during uFrame 7 if the TR is Idle to stop one source of babble. An IN transfer for a Running TR may happen at any time, so there's not much we can do about that. Ideally a hub firmware update to properly implement frame timeouts is needed, and to avoid spinning for up to 125us when submitting TDs to Idle rings. Signed-off-by: Jonathan Bell <jonathan@raspberrypi.com> xhci: constrain XHCI_VLI_HUB_TT_QUIRK to old firmware versions VLI have a firmware update for the VL805 which resolves the incorrect frame time calculation in the hub's TT. Limit applying the quirk to known-bad firmwares. 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.
Build status for rpi-6.1.y:
Build status for rpi-6.6.y:
Build status for rpi-6.12.y:
