| From: Felix Fietkau <nbd@nbd.name> |
| Date: Wed, 19 Jul 2017 08:49:31 +0200 |
| Subject: [PATCH] ath9k: adjust tx power reduction for US regulatory |
| domain |
| |
| FCC regulatory rules allow for up to 6 dBi antenna gain. Account for |
| this in the EEPROM based tx power reduction code. |
| |
| Signed-off-by: Felix Fietkau <nbd@nbd.name> |
| --- |
| |
| --- a/drivers/net/wireless/ath/ath9k/hw.c |
| +++ b/drivers/net/wireless/ath/ath9k/hw.c |
| @@ -2998,6 +2998,10 @@ void ath9k_hw_apply_txpower(struct ath_h |
| if (ant_gain > max_gain) |
| ant_reduction = ant_gain - max_gain; |
| |
| + /* FCC allows maximum antenna gain of 6 dBi */ |
| + if (reg->region == NL80211_DFS_FCC) |
| + ant_reduction = max_t(int, ant_reduction - 12, 0); |
| + |
| ah->eep_ops->set_txpower(ah, chan, ctl, |
| ant_reduction, new_pwr, test); |
| } |