linux-kernel - Re: [PATCH] serial/uart: Add tunable RX interrupt trigger I/F of FIFO buffers

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Message-ID: <20140217153748.513230fb@alan.etchedpixels.co.uk>
Date:	Mon, 17 Feb 2014 15:37:48 +0000
From:	One Thousand Gnomes <gnomes@...rguk.ukuu.org.uk>
To:	Yoshihiro YUNOMAE <yoshihiro.yunomae.ez@...achi.com>
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	linux-kernel@...r.kernel.org,
	Hidehiro Kawai <hidehiro.kawai.ez@...achi.com>,
	Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>
Subject: Re: [PATCH] serial/uart: Add tunable RX interrupt trigger I/F of
 FIFO buffers

> #define TIOCSFIFORTRIG    _IOW('T', 0x41, unsigned char)
> 
> > Also, why pass a pointer to a variable, and not just the value itself?
> 
> Ah, it's no big reason.
> It will pass just the value itself in V2.

We don't need ioctls here - we have a sysfs interface we can expand to do
this. We also need proper locking. This isn't a trivial change but its
perfectly doable given a real world use case.

> According to a manual of setserial command, we could set RX interrupt
> trigger only for the Hayes ESP serial driver. However, current kernel
> does not support Hayes ESP serial[1]. I couldn't find this feature for
> current 8250/16X50 drivers.

It is long gone and was a set of ugly device specific hacks.

Alan
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