From: Bob Copeland <me@bobcopeland.com>
Date: Wed, 14 Oct 2009 18:16:30 +0000 (-0400)
Subject: ath5k: use noise calibration from madwifi hal
X-Git-Tag: v2.6.33-rc1~388^2~599^2~85
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=e5e2647fd6ceef2cdc479954b84517535eb7febd;p=pandora-kernel.git

ath5k: use noise calibration from madwifi hal

This updates ath5k to calibrate the noise floor similar to the
way it is done in the madwifi hal and ath9k.  Of note:

- we start NF measurement at the same time as AGC calibration,
  but do not actually read the value until the periodic (long)
  calibration
- we keep a history of the last few values read and write the
  median back to the hardware for CCA
- we do not complain if NF calibration isn't complete, instead
  we keep the last read value.

Signed-off-by: Bob Copeland <me@bobcopeland.com>
Acked-by: Nick Kossifidis <mickflemm@gmail.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
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