openwrtv4/package/kernel/mac80211/patches/512-ath9k_channelbw_debugfs.patch

--- a/drivers/net/wireless/ath/ath9k/ath9k.h
+++ b/drivers/net/wireless/ath/ath9k/ath9k.h
@@ -701,6 +701,7 @@ struct ath_softc {
 	struct ieee80211_hw *hw;
 	struct device *dev;
 
+	u32 chan_bw;
 	struct survey_info *cur_survey;
 	struct survey_info survey[ATH9K_NUM_CHANNELS];
 
--- a/drivers/net/wireless/ath/ath9k/debug.c
+++ b/drivers/net/wireless/ath/ath9k/debug.c
@@ -1918,6 +1918,50 @@ static const struct file_operations fops
 	.owner = THIS_MODULE
 };
 
+
+static ssize_t read_file_chan_bw(struct file *file, char __user *user_buf,
+			     size_t count, loff_t *ppos)
+{
+	struct ath_softc *sc = file->private_data;
+	char buf[32];
+	unsigned int len;
+
+	len = sprintf(buf, "0x%08x\n", sc->chan_bw);
+	return simple_read_from_buffer(user_buf, count, ppos, buf, len);
+}
+
+static ssize_t write_file_chan_bw(struct file *file, const char __user *user_buf,
+			     size_t count, loff_t *ppos)
+{
+	struct ath_softc *sc = file->private_data;
+	unsigned long chan_bw;
+	char buf[32];
+	ssize_t len;
+
+	len = min(count, sizeof(buf) - 1);
+	if (copy_from_user(buf, user_buf, len))
+		return -EFAULT;
+
+	buf[len] = '\0';
+	if (kstrtoul(buf, 0, &chan_bw))
+		return -EINVAL;
+
+	sc->chan_bw = chan_bw;
+	if (!test_bit(SC_OP_INVALID, &sc->sc_flags))
+		ath9k_ops.config(sc->hw, IEEE80211_CONF_CHANGE_CHANNEL);
+
+	return count;
+}
+
+static const struct file_operations fops_chanbw = {
+	.read = read_file_chan_bw,
+	.write = write_file_chan_bw,
+	.open = simple_open,
+	.owner = THIS_MODULE,
+	.llseek = default_llseek,
+};
+
+
 int ath9k_init_debug(struct ath_hw *ah)
 {
 	struct ath_common *common = ath9k_hw_common(ah);
@@ -1937,6 +1981,8 @@ int ath9k_init_debug(struct ath_hw *ah)
 
 	debugfs_create_file("eeprom", S_IRUSR, sc->debug.debugfs_phy, sc,
 			    &fops_eeprom);
+	debugfs_create_file("chanbw", S_IRUSR | S_IWUSR, sc->debug.debugfs_phy,
+			    sc, &fops_chanbw);
 	debugfs_create_file("dma", S_IRUSR, sc->debug.debugfs_phy, sc,
 			    &fops_dma);
 	debugfs_create_file("interrupt", S_IRUSR, sc->debug.debugfs_phy, sc,
--- a/drivers/net/wireless/ath/ath9k/main.c
+++ b/drivers/net/wireless/ath/ath9k/main.c
@@ -1200,8 +1200,10 @@ static int ath9k_config(struct ieee80211
 
 	if ((changed & IEEE80211_CONF_CHANGE_CHANNEL) || reset_channel) {
 		struct ieee80211_channel *curchan = hw->conf.chandef.chan;
+		struct ath9k_channel *hchan;
 		int pos = curchan->hw_value;
 		int old_pos = -1;
+		u32 oldflags;
 		unsigned long flags;
 
 		if (ah->curchan)
@@ -1238,7 +1240,23 @@ static int ath9k_config(struct ieee80211
 			memset(&sc->survey[pos], 0, sizeof(struct survey_info));
 		}
 
-		if (ath_set_channel(sc, hw, &sc->sc_ah->channels[pos]) < 0) {
+		hchan = &sc->sc_ah->channels[pos];
+		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;
+		default:
+			hchan->channelFlags &= ~(CHANNEL_HALF | CHANNEL_QUARTER);
+			break;
+		}
+
+		if (ath_set_channel(sc, hw, hchan) < 0) {
 			ath_err(common, "Unable to set channel\n");
 			mutex_unlock(&sc->mutex);
 			ath9k_ps_restore(sc);