24 lines
756 B
Diff
24 lines
756 B
Diff
From: Felix Fietkau <nbd@nbd.name>
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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
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domain
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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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Signed-off-by: Felix Fietkau <nbd@nbd.name>
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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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+ /* FCC allows maximum antenna gain of 3 dBi */
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+ if (reg->region == NL80211_DFS_FCC)
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+ ant_reduction = max_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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