p54usb (LM87) not correctly working with usb1

p54usb (LM87) not correctly working with usb1

[Kristoffer Janke]

Hello,
i have an older server that only has usb 1.1 ports and attached a 
"Siemens Gigaset USB Adapter 54 V2" (chip: ISL3887, vid/pid: 
0x083a/0x4521), with the firmware 
http://daemonizer.de/prism54/prism54-fw/fw-usb/2.13.25.0.lm87.arm the 
device comes up and everything looks fine.

the only problem is, that hostapd does not work correctly, no wlan 
client can connect (but the device is in their list).
because i read somewhere that usb1.1 together with this device is not 
working correctly with hostapd, i tried it on a different machine, 
routed the device through virtual box usb driver and there it was 
working perfect; to check that its really a usb1.1 problem, i disabled 
the usb2.0 controllers and retried on that same machine -> not working, 
same behaviour as on the older server; i tested it again with usb 2.0 -> 
worked, 1.1 -> non working, 2.0 -> working.

so it looks like there is something bahving wrong if the device is 
connected to an usb 1.0/1.1 port.

im willing to debug this stuff if i get some pointers...

regards,
Kristoffer Janke

Re: p54usb (LM87) not correctly working with usb1

[Larry Finger]

On 01/21/2012 01:53 AM, Kristoffer Janke wrote:
> Hello,
> i have an older server that only has usb 1.1 ports and attached a "Siemens
> Gigaset USB Adapter 54 V2" (chip: ISL3887, vid/pid: 0x083a/0x4521), with the
> firmware http://daemonizer.de/prism54/prism54-fw/fw-usb/2.13.25.0.lm87.arm the
> device comes up and everything looks fine.
>
> the only problem is, that hostapd does not work correctly, no wlan client can
> connect (but the device is in their list).
> because i read somewhere that usb1.1 together with this device is not working
> correctly with hostapd, i tried it on a different machine, routed the device
> through virtual box usb driver and there it was working perfect; to check that
> its really a usb1.1 problem, i disabled the usb2.0 controllers and retried on
> that same machine -> not working, same behaviour as on the older server; i
> tested it again with usb 2.0 -> worked, 1.1 -> non working, 2.0 -> working.
>
> so it looks like there is something bahving wrong if the device is connected to
> an usb 1.0/1.1 port.
>
> im willing to debug this stuff if i get some pointers...

My Dell DW1450, which uses p54usb, does not work at all on a USB1.1 port. I 
tried with 3.3-rc1 from wireless-testing and with a 2.6.30 kernel. The failure 
does not appear to be a regression. With a 3.2 kernel, it it works fine on 
USB2.0 ports.

Larry