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When both CC1 and CC2 pins are simultaneously pulled up, it often leads to the double Rp to Vbus cable being stuck in the SNK_ATTACH_WAIT state. And the state machine fails to transition to the SNK_ATTACHED state. Therefore, it is recommended to focus on transitioning the sink port to the SNK_DEBOUNCED state instead. By doing so, the desired outcome can be achieved more effectively. [ 134.525750] VBUS on [ 134.713240] CC1: 0 -> 3, CC2: 0 -> 3 [state TOGGLING, polarity 0, connected] [ 134.713249] state change TOGGLING -> SNK_ATTACH_WAIT [rev3 NONE_AMS] Change-Id: Ib21f4f0322a193678a5f22007a515b3b19772b40 Signed-off-by: Michael Wu <michael@allwinnertech.com> Signed-off-by: Frank Wang <frank.wang@rock-chips.com> Link: https://lore.kernel.org/linux-usb/20240312011300.75081-1-michael@allwinnertech.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.