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CP2102N revision A01 (firmware version <= 1.0.4) has a buggy flow-control implementation that uses the ulXonLimit instead of ulFlowReplace field of the flow-control settings structure (erratum CP2102N_E104). A recent change that set the input software flow-control limits incidentally broke RTS control for these devices when CRTSCTS is not set as the new limits would always enable hardware flow control. Fix this by explicitly disabling flow control for the buggy firmware versions and only updating the input software flow-control limits when IXOFF is requested. This makes sure that the terminal settings matches the default zero ulXonLimit (ulFlowReplace) for these devices. Link: https://lore.kernel.org/r/20210609161509.9459-1-johan@kernel.org Reported-by: David Frey <dpfrey@gmail.com> Reported-by: Alex Villacís Lasso <a_villacis@palosanto.com> Tested-by: Alex Villacís Lasso <a_villacis@palosanto.com> Fixes: f61309d9c96a ("USB: serial: cp210x: set IXOFF thresholds") Cc: stable@vger.kernel.org # 5.12 Signed-off-by: Johan Hovold <johan@kernel.org>
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.