Steven Liu e4b2ee8a88 serial: 8250_port: reset LSR DLAB before set MCR
When setting the 16550 serial port baud rate, you need
to configure the UART to loopback mode. After setting
the DLL and DLH, you need to reset the LSR first,
and then configure the MCR to make the UART return
to the normal mode. If you do not reset the LSR
first, an error will occur when the UART RX is still
receiving data.

Signed-off-by: Steven Liu <steven.liu@rock-chips.com>
Change-Id: Ia940b278554ef1d4e7a6c4550fe4a4600407a57e
2021-07-05 10:21:21 +08:00
2019-02-10 00:33:21 +08:00
2019-02-10 00:33:21 +08:00
2019-08-29 19:45:37 +08:00
2019-08-29 19:45:37 +08:00

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.
See Documentation/00-INDEX for a list of what is contained in each file.

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.
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