package/kernel/mac80211/patches/330-ath9k-adjust-tx-power-reduction-for-US-regulatory-do.patch

   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 domain
   4
   5 FCC regulatory rules allow for up to 3 dBi antenna gain. Account for
   6 this in the EEPROM based tx power reduction code.
   7
   8 Signed-off-by: Felix Fietkau <nbd@nbd.name>
   9 ---
  10
  11 --- a/drivers/net/wireless/ath/ath9k/hw.c
  12 +++ b/drivers/net/wireless/ath/ath9k/hw.c
  13 @@ -2954,6 +2954,10 @@ void ath9k_hw_apply_txpower(struct ath_h
  14         if (ant_gain > max_gain)
  15                 ant_reduction = ant_gain - max_gain;
  16
  17 +       /* FCC allows maximum antenna gain of 3 dBi */
  18 +       if (reg->region == NL80211_DFS_FCC)
  19 +               ant_reduction = max_t(int, ant_reduction - 6, 0);
  20 +
  21         ah->eep_ops->set_txpower(ah, chan, ctl, ant_reduction, new_pwr, test);
  22  }
  23