Re: Problems with regulatory domain support and BCM43224

[Arend van Spriel]

On 04/11/2012 03:39 PM, Seth Forshee wrote:
> On Wed, Apr 11, 2012 at 12:16:40PM +0200, Arend van Spriel wrote:
> > On 04/10/2012 06:28 PM, Seth Forshee wrote:
> > > > The patch builds, and kind of works. Scanning seems to be fine; I can
> > > > >   see all the APs I expect in my area, including the one on a DFS channel
> > > > >   that I couldn't see previously. I can associate with my 2.4 GHz APs, but
> > > > >   not the 5 GHz AP. I see timme outs waiting for probe responses, and I'm
> > > > >   hitting the WARN_ON_ONCE in brcms_c_wait_for_tx_completion(). I haven't
> > > > >   really debugged this yet -- I thought I'd send out the patch to collect
> > > > >   comments while I debug. Suggestions of what's causing this are also
> > > > >   welcome:)
> > > This was due to always passing true for the value of mute_tx to
> > > brcms_b_set_chanspec() on passive channels. For now I'm just always
> > > passing false, which looks like it ought to be okay as we shouldn't have
> > > any tx on passive channels unless beacons are seen on the channel.
> >
> > Yes. I discovered this as well. Actually, I sent out a patch for
> > some people to test it. I submitted a slightly different patch to
> > John in which tx in unmuted upon receiving a beacon.
>
> I assume you're talking about this patch?
>
> http://www.spinics.net/lists/linux-wireless/msg88107.html
>
> My original changes would mute tx whenever IEEE80211_CHAN_PASSIVE_SCAN
> is set for the current channel. I'll try that again with your patch.

That is the one.

> > > > >   One of the major unresolved issues in the patch is what to do with the
> > > > >   data in struct locale_mimo_info. The regulatory rules only hold one
> > > > >   power level. I'm unsure why the brcmsmac implementation differs in this
> > > > >   regard. Suggestions?
> > > This is still one of the largest unsolved issues. I'm probably going to
> > > need some advice on how to fill out the txpwr information when
> > > regualtory rules external to the driver can be applied.
> >
> > The power constraints for HT (covered by struct locale_mimo_info)
> > are handled differently from non-HT. I have to confirm internally
> > whether this is specific for our devices or actually needed to be
> > compliant.
>
> Great, thanks.

No answer on this one yet, but keep you posted.

Gr. AvS

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