Subject: Re: [Rt2400-devel] Mode selection in mac80211
From: Johannes Berg <johannes@sipsolutions.net>
To: Ivo van Doorn <ivdoorn@gmail.com>
Cc: rt2400-devel@lists.sourceforge.net,
	Adam Baker <linux@baker-net.org.uk>,
	"Luis R. Rodriguez" <mcgrof@gmail.com>,
	linux-wireless@vger.kernel.org
In-Reply-To: <200710091627.44276.IvDoorn@gmail.com> (sfid-20071009_151132_712958_0EA613F1)
References: <200710052319.10600.linux@baker-net.org.uk>
	 <200710082308.38260.IvDoorn@gmail.com>
	 <1191921642.4013.13.camel@johannes.berg>
	 <200710091627.44276.IvDoorn@gmail.com>
	 (sfid-20071009_151132_712958_0EA613F1)
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Date: Tue, 09 Oct 2007 19:05:26 +0200
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On Tue, 2007-10-09 at 16:27 +0200, Ivo van Doorn wrote:

> The IFS is also passed on as argument by mac80211 when it configures the
> TX rings. The EIFS register is something different, all other Ralink devi=
ces
> have only 1 value for the EIFS. I am not even sure how the device will re=
act
> when the same value is set for rt2500usb.

Ok but IFS definitely needs to be set. EIFS I'm not entirely sure about,
haven't looked at the timing diagrams for a long time.

> Note that the fact that the IFS is set twice for rt2500usb might suggest =
the
> documentation for the register is incorrect and perhaps the purpose of th=
e
> register is completely different.

Heh.

> I guess it requires some experimentation to see if initializing those
> 2 registers differently has any effect. (And if it doesn't, then rt2500us=
b doesn't
> require to know whether it is operating in B or G mode at all).

That won't be easy to tell, but the IFS is different afaik so there the
mode has an influence. But I think that this mode setting need not be
tied to the frequency table.

johannes

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