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The FUSB302B failed to detect sink devices from SRC_UNATTACHED state with SRC 180 uA CC current setting, the TCPM and FUSB302 logs like the below and FUSB302B has no further action. [ 72.229911] fusb302 IRQ: 0x21, a: 0x00, b: 0x00, status0: 0x23: [ 72.229993] fusb302 IRQ: COMP_CHNG, comp=true: [ 72.230212] fusb302 cc1=Open, cc2=Open: [ 72.230265] tcpm CC1: 2 -> 0, CC2: 0 -> 0 [state SRC_ATTACH_WAIT, polarity 0, disconnected]: [ 72.230306] tcpm state change SRC_ATTACH_WAIT -> SRC_UNATTACHED [rev3 NONE_AMS]: [ 72.230345] tcpm Start toggling: [ 72.237430] fusb302 start drp toggling: The vendor said that FUSB302B was designed with 80uA for sink detection which means it can only guarantee FUSB302B will works well with that setting, so amend the SRC CC current at toggling to fix it. Signed-off-by: Frank Wang <frank.wang@rock-chips.com> Change-Id: Iefeb7dd20c03c04832ac82d43cc4f8d9edccbcc6
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.