linux-kernel - Re: usbserial speed limitations ?

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Message-ID: <20100204124544.7e29ea3f@tux.DEF.witbe.net>
Date:	Thu, 4 Feb 2010 12:45:44 +0100
From:	Paul Rolland <rol@...917.net>
To:	Oliver Neukum <oliver@...kum.org>
Cc:	LKML <linux-kernel@...r.kernel.org>, linux-usb@...r.kernel.org,
	rol@...917.net
Subject: Re: usbserial speed limitations ?

Hi Oliver,

On Thu, 4 Feb 2010 12:26:21 +0100
Oliver Neukum <oliver@...kum.org> wrote:

> Am Donnerstag, 4. Februar 2010 09:58:55 schrieb Paul Rolland:
> > "Maximum connection speed is limited by the current generic usbserial
> > driver to approximately less than 500kbps."
> > 
> > Is there really such a speed limitation in the usbserial module/driver ?
> > This modem is HSPA+, which should allow a theorical maximum downspeed of
> > 20MBps, not 500kbps...
> 
> In the generic usbserial driver this speed limit indeed exists.
> But you are not supposed to use it with that kind of device.
> Most likely the correct driver would be either option or sierra.
> Please post lsusb -v for your device.

I don't have yet the device, but the informations I have so far are :
 - It is Vendor ID 0x1410, product ID 0x5023 when connected for the first
   time, and then it is a disk device.
 - Ejecting it makes it appear as Vendor ID 0x1410, product ID 0x7030

Novatel also refers to their procedure for the linux installation :
(http://www.nvtl.com/index.php?option=com_content&view=article&id=139&Itemid=305
which has a link to 
http://www.nvtl.com/index.php?option=com_content&view=article&id=176&Itemid=331)

This applies to Ovation MC930D and Ovation MC950D, which are supported by
option.c

So, I suspect the best would be to add the 0x7030 Product ID in the option
driver, and git it a shoot...

Regards,
Paul
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