ath9k: add a small hack to make changing the channel bandwidth to 5/1…

…0 mhz available through debugfs - does not work on all chipsets and is not recommended for production use yet

SVN-Revision: 27340

package/mac80211/patches/540-ath9k_channelbw_debugfs.patch

@@ -0,0 +1,54 @@
+--- a/drivers/net/wireless/ath/ath9k/ath9k.h
++++ b/drivers/net/wireless/ath/ath9k/ath9k.h
+@@ -586,6 +586,7 @@ struct ath_softc {
+ 	struct ieee80211_hw *hw;
+ 	struct device *dev;
+
++	u32 chan_bw;
+ 	int chan_idx;
+ 	int chan_is_ht;
+ 	struct survey_info *cur_survey;
+--- a/drivers/net/wireless/ath/ath9k/debug.c
++++ b/drivers/net/wireless/ath/ath9k/debug.c
+@@ -1281,6 +1281,9 @@ int ath9k_init_debug(struct ath_hw *ah)
+ 	debugfs_create_file("eeprom", S_IRUSR, sc->debug.debugfs_phy, sc,
+ 			    &fops_eeprom);
+
++	debugfs_create_u32("chanbw", S_IRUSR | S_IWUSR, sc->debug.debugfs_phy,
++			   &sc->chan_bw);
++
+ 	sc->debug.regidx = 0;
+ 	return 0;
+ }
+--- a/drivers/net/wireless/ath/ath9k/main.c
++++ b/drivers/net/wireless/ath/ath9k/main.c
+@@ -226,6 +226,7 @@ static int ath_set_channel(struct ath_so
+ 	bool fastcc = true, stopped;
+ 	struct ieee80211_channel *channel = hw->conf.channel;
+ 	struct ath9k_hw_cal_data *caldata = NULL;
++	u32 oldflags;
+ 	int r;
+
+ 	if (sc->sc_flags & SC_OP_INVALID)
+@@ -268,6 +269,21 @@ static int ath_set_channel(struct ath_so
+ 	if (!stopped || !(sc->sc_flags & SC_OP_OFFCHANNEL))
+ 		fastcc = false;
+
++	oldflags = hchan->channelFlags;
++	switch (sc->chan_bw) {
++	case 5:
++		hchan->channelFlags &= ~CHANNEL_HALF;
++		hchan->channelFlags |= CHANNEL_QUARTER;
++		break;
++	case 10:
++		hchan->channelFlags &= ~CHANNEL_QUARTER;
++		hchan->channelFlags |= CHANNEL_HALF;
++		break;
++	}
++
++	if (oldflags != hchan->channelFlags)
++		fastcc = false;
++
+ 	if (!(sc->sc_flags & SC_OP_OFFCHANNEL))
+ 		caldata = &sc->caldata;
+