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   1 From: Felix Fietkau <nbd@nbd.name>
   2 Date: Wed, 19 Jul 2017 08:49:31 +0200
   3 Subject: [PATCH] ath9k: adjust tx power reduction for US regulatory
   4  domain
   5
   6 FCC regulatory rules allow for up to 6 dBi antenna gain. Account for
   7 this in the EEPROM based tx power reduction code.
   8
   9 Signed-off-by: Felix Fietkau <nbd@nbd.name>
  10 ---
  11
  12 --- a/drivers/net/wireless/ath/ath9k/hw.c
  13 +++ b/drivers/net/wireless/ath/ath9k/hw.c
  14 @@ -2996,6 +2996,10 @@ void ath9k_hw_apply_txpower(struct ath_h
  15         if (ant_gain > max_gain)
  16                 ant_reduction = ant_gain - max_gain;
  17
  18 +       /* FCC allows maximum antenna gain of 6 dBi */
  19 +       if (reg->region == NL80211_DFS_FCC)
  20 +               ant_reduction = max_t(int, ant_reduction - 12, 0);
  21 +
  22         ah->eep_ops->set_txpower(ah, chan, ctl,
  23                                  ant_reduction, new_pwr, test);
  24  }