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-rw-r--r--package/kernel/mac80211/patches/314-ath9k_hw-fix-channel-maximum-power-level-test.patch47
1 files changed, 47 insertions, 0 deletions
diff --git a/package/kernel/mac80211/patches/314-ath9k_hw-fix-channel-maximum-power-level-test.patch b/package/kernel/mac80211/patches/314-ath9k_hw-fix-channel-maximum-power-level-test.patch
new file mode 100644
index 0000000..67cbe92
--- /dev/null
+++ b/package/kernel/mac80211/patches/314-ath9k_hw-fix-channel-maximum-power-level-test.patch
@@ -0,0 +1,47 @@
+From: Felix Fietkau <nbd@nbd.name>
+Date: Wed, 22 Mar 2017 20:37:04 +0100
+Subject: [PATCH] ath9k_hw: fix channel maximum power level test
+
+The tx power applied by set_txpower is limited by the CTL (conformance
+test limit) entries in the EEPROM. These can change based on the user
+configured regulatory domain.
+Depending on the EEPROM data this can cause the tx power to become too
+limited, if the original regdomain CTLs impose lowr limits than the CTLs
+of the user configured regdomain.
+
+To fix this issue, set the initial channel limits without any CTL
+restrictions and only apply the CTL at run time when setting the channel
+and the real tx power.
+
+Cc: stable@vger.kernel.org
+Signed-off-by: Felix Fietkau <nbd@nbd.name>
+---
+
+--- a/drivers/net/wireless/ath/ath9k/hw.c
++++ b/drivers/net/wireless/ath/ath9k/hw.c
+@@ -2937,10 +2937,14 @@ void ath9k_hw_apply_txpower(struct ath_h
+ struct ieee80211_channel *channel;
+ int chan_pwr, new_pwr, max_gain;
+ int ant_gain, ant_reduction = 0;
++ u16 ctl = NO_CTL;
+
+ if (!chan)
+ return;
+
++ if (!test)
++ ctl = ath9k_regd_get_ctl(reg, chan);
++
+ channel = chan->chan;
+ chan_pwr = min_t(int, channel->max_power * 2, MAX_RATE_POWER);
+ new_pwr = min_t(int, chan_pwr, reg->power_limit);
+@@ -2950,9 +2954,7 @@ void ath9k_hw_apply_txpower(struct ath_h
+ if (ant_gain > max_gain)
+ ant_reduction = ant_gain - max_gain;
+
+- ah->eep_ops->set_txpower(ah, chan,
+- ath9k_regd_get_ctl(reg, chan),
+- ant_reduction, new_pwr, test);
++ ah->eep_ops->set_txpower(ah, chan, ctl, ant_reduction, new_pwr, test);
+ }
+
+ void ath9k_hw_set_txpowerlimit(struct ath_hw *ah, u32 limit, bool test)