linux-kernel - Re: Handshaking on USB serial devices

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Message-ID: <47B51E55.6020203@davidnewall.com>
Date:	Fri, 15 Feb 2008 15:38:37 +1030
From:	David Newall <davidn@...idnewall.com>
To:	Alan Cox <alan@...rguk.ukuu.org.uk>
CC:	Gene Heskett <gene.heskett@...il.com>, Greg KH <greg@...ah.com>,
	linux-usb@...r.kernel.org,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: Handshaking on USB serial devices

Alan Cox wrote:
>> byte of a packet is being thrown away about .1% of the time for the pl2303, 
>> but I'm not sure if the FTDI driver still suffers from a similar rash.  I 
>>     
>
> A 20 byte low speed message is too small for flow control to account for
> it.

I agree.  I've observed the first byte of received data disappears on
pl2303 devices, but haven't spent time finding out why.  (It's on my list.)
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