From 1f0c4a1528e202f08bb238fa338e611520a9f562 Mon Sep 17 00:00:00 2001
From: nbd <nbd@3c298f89-4303-0410-b956-a3cf2f4a3e73>
Date: Sat, 18 Dec 2010 02:14:52 +0000
Subject: [PATCH] ath9k: do not force the chainmask to 1 for legacy mode - it
 makes no sense and it reduces txpower and unnecessarily disables MRC

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@24657 3c298f89-4303-0410-b956-a3cf2f4a3e73
---
 .../531-ath9k_legacy_chainmask_fix.patch      | 75 +++++++++++++++++++
 1 file changed, 75 insertions(+)
 create mode 100644 package/mac80211/patches/531-ath9k_legacy_chainmask_fix.patch

diff --git a/package/mac80211/patches/531-ath9k_legacy_chainmask_fix.patch b/package/mac80211/patches/531-ath9k_legacy_chainmask_fix.patch
new file mode 100644
index 000000000..df7e5cbbf
--- /dev/null
+++ b/package/mac80211/patches/531-ath9k_legacy_chainmask_fix.patch
@@ -0,0 +1,75 @@
+--- a/drivers/net/wireless/ath/ath9k/ath9k.h
++++ b/drivers/net/wireless/ath/ath9k/ath9k.h
+@@ -665,7 +665,6 @@ void ath9k_deinit_device(struct ath_soft
+ void ath9k_set_hw_capab(struct ath_softc *sc, struct ieee80211_hw *hw);
+ void ath9k_update_ichannel(struct ath_softc *sc, struct ieee80211_hw *hw,
+ 			   struct ath9k_channel *ichan);
+-void ath_update_chainmask(struct ath_softc *sc, int is_ht);
+ int ath_set_channel(struct ath_softc *sc, struct ieee80211_hw *hw,
+ 		    struct ath9k_channel *hchan);
+ 
+--- a/drivers/net/wireless/ath/ath9k/main.c
++++ b/drivers/net/wireless/ath/ath9k/main.c
+@@ -538,32 +538,6 @@ set_timer:
+ 	}
+ }
+ 
+-/*
+- * Update tx/rx chainmask. For legacy association,
+- * hard code chainmask to 1x1, for 11n association, use
+- * the chainmask configuration, for bt coexistence, use
+- * the chainmask configuration even in legacy mode.
+- */
+-void ath_update_chainmask(struct ath_softc *sc, int is_ht)
+-{
+-	struct ath_hw *ah = sc->sc_ah;
+-	struct ath_common *common = ath9k_hw_common(ah);
+-
+-	if ((sc->sc_flags & SC_OP_OFFCHANNEL) || is_ht ||
+-	    (ah->btcoex_hw.scheme != ATH_BTCOEX_CFG_NONE)) {
+-		common->tx_chainmask = ah->caps.tx_chainmask;
+-		common->rx_chainmask = ah->caps.rx_chainmask;
+-	} else {
+-		common->tx_chainmask = 1;
+-		common->rx_chainmask = 1;
+-	}
+-
+-	ath_dbg(common, ATH_DBG_CONFIG,
+-		"tx chmask: %d, rx chmask: %d\n",
+-		common->tx_chainmask,
+-		common->rx_chainmask);
+-}
+-
+ static void ath_node_attach(struct ath_softc *sc, struct ieee80211_sta *sta)
+ {
+ 	struct ath_node *an;
+@@ -1676,8 +1650,6 @@ static int ath9k_config(struct ieee80211
+ 		/* XXX: remove me eventualy */
+ 		ath9k_update_ichannel(sc, hw, &sc->sc_ah->channels[pos]);
+ 
+-		ath_update_chainmask(sc, conf_is_ht(conf));
+-
+ 		/* update survey stats for the old channel before switching */
+ 		spin_lock_irqsave(&common->cc_lock, flags);
+ 		ath_update_survey_stats(sc);
+@@ -1909,10 +1881,6 @@ static void ath9k_bss_info_changed(struc
+ 		/* Set aggregation protection mode parameters */
+ 		sc->config.ath_aggr_prot = 0;
+ 
+-		/* Only legacy IBSS for now */
+-		if (vif->type == NL80211_IFTYPE_ADHOC)
+-			ath_update_chainmask(sc, 0);
+-
+ 		ath_dbg(common, ATH_DBG_CONFIG, "BSSID: %pM aid: 0x%x\n",
+ 			common->curbssid, common->curaid);
+ 
+--- a/drivers/net/wireless/ath/ath9k/virtual.c
++++ b/drivers/net/wireless/ath/ath9k/virtual.c
+@@ -288,7 +288,6 @@ void ath9k_wiphy_chan_work(struct work_s
+ 	/* sync hw configuration for hw code */
+ 	common->hw = aphy->hw;
+ 
+-	ath_update_chainmask(sc, sc->chan_is_ht);
+ 	if (ath_set_channel(sc, aphy->hw,
+ 			    &sc->sc_ah->channels[sc->chan_idx]) < 0) {
+ 		printk(KERN_DEBUG "ath9k: Failed to set channel for new "