Re: ath9k_htc fails to initialize TL-WN721N with compat-wireless 3.0-rc4-1

[Forest Bond <forest@alittletooquiet.net>]

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Hi shafi,

On Wed, Jul 06, 2011 at 03:58:13AM -0400, Mohammed Shafi wrote:
> > To avoid multi reg writes please apply the following change
> >
> > diff --git a/drivers/net/wireless/ath/ath9k/wmi.h
> > b/drivers/net/wireless/ath/ath9k/wmi.h
> > index fde6da6..0878add 100644
> > --- a/drivers/net/wireless/ath/ath9k/wmi.h
> > +++ b/drivers/net/wireless/ath/ath9k/wmi.h
> > @@ -124,7 +124,7 @@ enum wmi_event_id {
> >        WMI_TXSTATUS_EVENTID,
> >         };
> >
> >          -#define MAX_CMD_NUMBER 62
> >          +#define MAX_CMD_NUMBER 1
> >
> >            struct register_write {
> >                    __be32 reg;
> > --
> 
> did you try in your system the simple hack Raj had suggested?
> it seems to solve ths issue, but we encountered some soft lock ups due
> to the LED stuff is moved to mac80211 with the recent code base,
> we will take a look at this to fix this, probably requires some backporting.

Yes, the device seems to initialize properly with this patch.  Like you
expected, I am seeing soft lock-ups when I try to bring the interface up.

> in order to recreate the issue, we installed Ubuntu 8.04- the Hardy
> Heron - released in April 2008.
> as expected the issue is perfectly reproducible. thanks to Raj for his
> help and suggestions.

Thanks for taking the time to test.  I really appreciate everyone's help.

> *please obtain the stable compat-wireless-2.6.36-4
> http://linuxwireless.org/en/users/Download/stable/#compat-wireless_2.6.36_stable_releases
> *download the old firmware
> http://git.kernel.org/?p=linux/kernel/git/dwmw2/linux-firmware.git;a=blob_plain;f=ar9271.fw;hb=HEAD
> (history http://git.kernel.org/?p=linux/kernel/git/dwmw2/linux-firmware.git;a=history;f=ar9271.fw;h=d0ee74a1c8dccb7cc21f5be90f1d4048fa9dbf9e;hb=HEAD)
> with this your USB card will be up and running, we did some basic testing.
> *I used  usbmodeswitch-0.9.4

Ultimately we'd like to try the experimental AP mode.  I understand this was
introduced in kernel version 2.6.40, so I don't think compat-wireless-2.6.36-4
will work for us.

Can you point me to the LED-related commits that you mentioned above?  We'll
either need to backport the changes required to fix the soft lock-ups or upgrade
our kernel to include these commits.

> we also recommend you upgrade to latest kernel available for your distribution,
> because we may still face some other issues as ath9k_htc very much new
> compared to ath9k

A kernel upgrade is something I would like to avoid if possible, but of course
it is something we'll consider if we need to.

> please also read
> http://wireless.kernel.org/en/users/Download/compat-wireless-old

I think this kernel is supported by the regular compat-wireless package, right?

Thanks,
Forest
-- 
Forest Bond
http://www.alittletooquiet.net
http://www.rapidrollout.com

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