From mboxrd@z Thu Jan  1 00:00:00 1970
From: Luis R. Rodriguez <lrodriguez@atheros.com>
Date: Mon, 27 Sep 2010 11:19:52 -0700
Subject: [ath9k-devel] [AR9160]: 3 RX chain operation in 11abg
 legacy-only mode?
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On Sat, Sep 25, 2010 at 08:14:43PM -0700, Adrian Chadd wrote:
> Hi,
> 
> FreeBSD's AR9160 support enables all three RX chains in legacy mode.
> The ath9k codebase doesn't - it calibrates all three chains, but the
> ADC calibration results in legacy mode give all 0x0's for chain 1 and 2.
> (And seemingly invalid results for chain 0 in 11g mode, but that's another
> issue which I am hoping someone will comment on.)
> 
> Is there any benefit or detriment to leaving RX chains 1 and 2 enabled
> when in 11a/11bg mode? Does the unit do any kind of multipath
> discrimination?

Good question, not sure, but I can see the benefit of enabling other
chains for selection diversity for legacy, perhaps we just never
bothered implementing that on ath9k on Linux.

  Luis