From: Stephen Warren <swarren@wwwdotorg.org>
To: Yoshihiro YUNOMAE <yoshihiro.yunomae.ez@hitachi.com>,
Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
Heikki Krogerus <heikki.krogerus@linux.intel.com>,
Stephen Warren <swarren@nvidia.com>,
Alan <gnomes@lxorguk.ukuu.org.uk>
Cc: Jingoo Han <jg1.han@samsung.com>,
linux-kernel@vger.kernel.org,
Hidehiro Kawai <hidehiro.kawai.ez@hitachi.com>,
linux-serial@vger.kernel.org, yrl.pp-manager.tt@hitachi.com,
Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>,
Aaron Sierra <asierra@xes-inc.com>, Jiri Slaby <jslaby@suse.cz>
Subject: Re: [PATCH V6] serial/uart/8250: Add tunable RX interrupt trigger I/F of FIFO buffers
Date: Mon, 21 Apr 2014 13:39:01 -0600 [thread overview]
Message-ID: <535573D5.9050805@wwwdotorg.org> (raw)
In-Reply-To: <20140417060644.27329.31663.stgit@yunodevel>
On 04/17/2014 12:06 AM, Yoshihiro YUNOMAE wrote:
> Add tunable RX interrupt trigger I/F of FIFO buffers.
> Serial devices are used as not only message communication devices but control
> or sending communication devices. For the latter uses, normally small data
> will be exchanged, so user applications want to receive data unit as soon as
> possible for real-time tendency. If we have a sensor which sends a 1 byte data
> each time and must control a device based on the sensor feedback, the RX
> interrupt should be triggered for each data.
>
> According to HW specification of serial UART devices, RX interrupt trigger
> can be changed, but the trigger is hard-coded. For example, RX interrupt trigger
> in 16550A can be set to 1, 4, 8, or 14 bytes for HW, but current driver sets
> the trigger to only 8bytes.
>
> This patch makes some devices change RX interrupt trigger from userland.
Reviewed-by: Stephen Warren <swarren@nvidia.com>
next prev parent reply other threads:[~2014-04-21 19:45 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-04-17 6:06 [PATCH V6] serial/uart/8250: Add tunable RX interrupt trigger I/F of FIFO buffers Yoshihiro YUNOMAE
2014-04-21 19:39 ` Stephen Warren [this message]
2014-04-24 23:11 ` Greg Kroah-Hartman
2014-04-25 8:53 ` Yoshihiro YUNOMAE
2014-04-25 16:01 ` Greg Kroah-Hartman
2014-05-08 2:15 ` Yoshihiro YUNOMAE
2014-05-08 2:15 ` Yoshihiro YUNOMAE
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