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From: "H. Peter Anvin" <hpa@zytor.com>
Subject: Re: TCSBRK(1) on pl2303 USB/serial returns prematurely
Date: Mon, 12 Jun 2006 10:19:29 -0700 (PDT)
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References: <20060612145750.GA19338@kestrel.barix.local>
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Followup to:  <20060612145750.GA19338@kestrel.barix.local>
By author:    Karel Kulhavy <clock@twibright.com>
In newsgroup: linux.dev.kernel
>
> Hello
> 
> TCSBRK(1) ioctl system call on pl2303 USB/serial converter on 2.6.16.19
> returns prematurely. Additional 53ms delay is necessary to work this
> around at speed of 57600. TCSBRK(1) is translation of the tcdrain()
> function by glibc. With ordinary serial port the TCSBRK(1) seems to work
> correctly.
> 

Not only that, but pl2303 doesn't seem to be able to receive a break
properly, either.

	-hpa