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The USB Type-C Cable and Connector Specification defines the wire connections for the USB Type-C to USB 2.0 Standard-A cable assembly (Release 2.2, Chapter 3.5.2). The Notes says that Pin A5 (CC) of the USB Type-C plug shall be connected to Vbus through a resister Rp. However, there is a large amount of such double Rp connected to Vbus non-standard cables which produced by UGREEN circulating on the market, and it can affects the normal operations of the state machine easily, especially to CC1 and CC2 be pulled up at the same time. In fact, we can regard those cables as sink to avoid abnormal state. Message as follow: [ 58.900212] VBUS on [ 59.265433] CC1: 0 -> 3, CC2: 0 -> 3 [state TOGGLING, polarity 0, connected] [ 62.623308] CC1: 3 -> 0, CC2: 3 -> 0 [state TOGGLING, polarity 0, disconnected] [ 62.625006] VBUS off [ 62.625012] VBUS VSAFE0V Signed-off-by: Michael Wu <michael@allwinnertech.com> Reviewed-by: Guenter Roeck <linux@roeck-us.net> Reviewed-by: Heikki Krogerus <heikki.krogerus@linux.intel.com> Link: https://lore.kernel.org/r/20230920063030.66312-1-michael@allwinnertech.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> |
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| README | ||
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.