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@@ -0,0 +1,23 @@
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+From: Felix Fietkau <[email protected]>
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+Date: Wed, 19 Jul 2017 08:49:31 +0200
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+Subject: [PATCH] ath9k: adjust tx power reduction for US regulatory domain
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+
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+FCC regulatory rules allow for up to 3 dBi antenna gain. Account for
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+this in the EEPROM based tx power reduction code.
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+
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+Signed-off-by: Felix Fietkau <[email protected]>
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+---
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+
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+--- a/drivers/net/wireless/ath/ath9k/hw.c
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++++ b/drivers/net/wireless/ath/ath9k/hw.c
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+@@ -2954,6 +2954,10 @@ void ath9k_hw_apply_txpower(struct ath_h
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+ if (ant_gain > max_gain)
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+ ant_reduction = ant_gain - max_gain;
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+
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++ /* FCC allows maximum antenna gain of 3 dBi */
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++ if (reg->region == NL80211_DFS_FCC)
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++ ant_reduction = min_t(int, ant_reduction - 6, 0);
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++
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+ ah->eep_ops->set_txpower(ah, chan, ctl, ant_reduction, new_pwr, test);
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+ }
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+
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Felix Fietkau