linux-kernel - [PATCH v1 0/1] serial: 8250_dw: Allow hardware flow control to be used

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Date:   Tue,  6 Dec 2016 14:34:02 -0800
From:   Jason Uy <jason.uy@...adcom.com>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Jiri Slaby <jslaby@...e.com>
Cc:     Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Kefeng Wang <wangkefeng.wang@...wei.com>,
        Noam Camus <noamc@...hip.com>,
        Heikki Krogerus <heikki.krogerus@...ux.intel.com>,
        Wang Hongcheng <annie.wang@....com>,
        Jason Uy <jason.uy@...adcom.com>, linux-serial@...r.kernel.org,
        linux-kernel@...r.kernel.org, bcm-kernel-feedback-list@...adcom.com
Subject: [PATCH v1 0/1] serial: 8250_dw: Allow hardware flow control to be used

This patchset contains changes to allow AUTOCTS to be set for the Synopsys DW UART driver.  There is currently no way to set AUTOCTS unless the platform adds a quirk entry and sets the termios callback function.  

There was a discussion about a similar proposed patch change.  It was mentioned in the discussion that the reason set_termios hook was not set by default is because someone might be using a certain type of clock that can't handle rate rounding and ended up using improper clock frequency for some baud rates.  See discussion thread here.

https://groups.google.com/forum/#!topic/fa.linux.kernel/oWrFOsw3rpQ

The current dw8250_set_termios is set such that it always call the standard serial8250_do_set_termios.  So if there are clock frequency issues, this will be resolved in serial8250_do_set_termios.

This patchset has been tested on Cygnus VOIP board bcm911360_entphn board.

This patchset is based on v4.9-rc1

repo: https://github.com/Broadcom/cygnus-linux.git

branch: cygnus-tty-v1

Jason Uy (1):
  serial: 8250_dw: Allow hardware flow control to be used

 drivers/tty/serial/8250/8250_dw.c | 5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

-- 
1.9.1