Message-ID: <4E95CE29.2070106@lwfinger.net> (sfid-20111012_192816_808064_BCB8693D)
Date: Wed, 12 Oct 2011 12:28:09 -0500
From: Larry Finger <Larry.Finger@lwfinger.net>
MIME-Version: 1.0
To: Ian Jeffray <ian@emobix.co.uk>
CC: linux-wireless@vger.kernel.org
Subject: Re: r8712u driver - on ARM
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On 10/12/2011 10:30 AM, Ian Jeffray wrote:
> On 02/10/2011 00:24, Ian Jeffray wrote:
>> On 01/10/2011 20:24, Larry Finger wrote:
>>
>>> BTW, netperf shows that r8712u can transmit at ~80 and receive at ~60
>>> Mbps when connected to a 270 Mbps AP. As Realtek lists this as capable
>>> of 150 Mbps, x86_64 is getting the max transmit rate that we might
>>> expect.
>>
>> On x86 32bit, I get a sustained 94Mbps transmit to a 300Mbps AP, which
>> seems pretty good - why I'm keen to get this to work for my ARM target.
>
> Larry, just a little more info on this issue, FYI.
>
> It would seem the problem is certainly specific to the 'Inventra' mUSB
> host found in recent TI ARM products and ADI Blackfin devices.
>
> I have added a PCI express NEC USB 2.0 host controller card to my ARM
> Cortex A8 system, and the r8712u devices work just fine when connected
> via that host controller. (Albeit only at 20MBps rate, but that's
> because the host controller is rather poor in general).
>
> We have now raised this problem with TI USB experts.

Thanks for the update. Good luck with finding the real problem and let me know 
if I can be of help.

Larry