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Sherry Sun 06e91df16f tty: serial: fsl_lpuart: fix the wrong return value in lpuart32_get_mctrl Patch `e60c2991f1` make the lpuart32_get_mctrl always return 0, actually this will break the functions of device which use flow control such as Bluetooth. For lpuart32 plaform, the hardware can handle the CTS automatically. So we should set TIOCM_CTS active. Also need to set CAR and DSR active. Patch has been tested on lpuart32 platforms such as imx8qm and imx8ulp. Fixes: `e60c2991f1` ("serial: fsl_lpuart: remove RTSCTS handling from get_mctrl()") Cc: stable <stable@vger.kernel.org> Signed-off-by: Sherry Sun <sherry.sun@nxp.com> Link: https://lore.kernel.org/r/20210729083109.31541-1-sherry.sun@nxp.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>		History 2021-07-29 17:05:59 +02:00
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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.