** Branch linked: lp:ubuntu/precise-proposed/linux-lts-trusty
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https://bugs.launchpad.net/bugs/1328295
Title:
[serial] use hw flow control if supported
Status in “linux” package in Ubuntu:
Fix Committed
Status in “linux” source package in Trusty:
Fix Committed
Bug description:
HP Moonshot cartridges support hardware flow control, but right now
only software assisted hw flow control is supported. This patch from
upstream enables this functionality when exposed by firmware:
commit 06aa82e498c144c7784a6f3d3b55458b272d6146
Author: Murali Karicheri <m-kariche...@ti.com>
Date: Thu May 1 15:04:53 2014 -0400
serial: uart: add hw flow control support configuration
8250 uart driver currently supports only software assisted hw flow
control. The software assisted hw flow control maintains a hw_stopped
flag in the tty structure to stop and start transmission and use modem
status interrupt for the event to drive the handshake signals. This is
not needed if hw has flow control capabilities. This patch adds a
DT attribute for enabling hw flow control for a uart port. Also skip
stop and start if this flag is present in flag field of the port
structure.
Signed-off-by: Murali Karicheri <m-kariche...@ti.com>
CC: Rob Herring <robh...@kernel.org>
CC: Pawel Moll <pawel.m...@arm.com>
CC: Mark Rutland <mark.rutl...@arm.com>
CC: Ian Campbell <ijc+devicet...@hellion.org.uk>
CC: Kumar Gala <ga...@codeaurora.org>
CC: Randy Dunlap <rdun...@infradead.org>
CC: Jiri Slaby <jsl...@suse.cz>
CC: Santosh Shilimkar <santosh.shilim...@ti.com>
Signed-off-by: Greg Kroah-Hartman <gre...@linuxfoundation.org>
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