ath9k: add beacon related stability fixes

Signed-off-by: Felix Fietkau <nbd@nbd.name>

1 files changed, 70 insertions, 0 deletions

diff --git a/package/kernel/mac80211/patches/313-ath9k-Handle-channel-context-in-get_-set_-reset_tsf.patch b/package/kernel/mac80211/patches/313-ath9k-Handle-channel-context-in-get_-set_-reset_tsf.patch
new file mode 100644
index 0000000000..ef0afbea9c
--- /dev/null
+++ b/package/kernel/mac80211/patches/313-ath9k-Handle-channel-context-in-get_-set_-reset_tsf.patch
@@ -0,0 +1,70 @@
+From: Benjamin Berg <benjamin.berg@open-mesh.com>
+Date: Mon, 4 Jul 2016 14:37:21 +0200
+Subject: [PATCH] ath9k: Handle channel context in get_/set_/reset_tsf
+
+The ath9k TSF handling routines need to be aware of the channel context that
+is being modified. With this change the TSF related values that are stored
+in each channel context will be correctly tracked and the harware will only
+be updated if the modified context is currently the active one.
+
+Without this change the TSF modifications done using these routines would
+for example be lost during a hardware reset as done by ath_complete_reset.
+
+Signed-off-by: Benjamin Berg <benjamin.berg@open-mesh.com>
+---
+
+--- a/drivers/net/wireless/ath/ath9k/main.c
++++ b/drivers/net/wireless/ath/ath9k/main.c
+@@ -1823,11 +1823,18 @@ static void ath9k_bss_info_changed(struc
+ static u64 ath9k_get_tsf(struct ieee80211_hw *hw, struct ieee80211_vif *vif)
+ {
+ 	struct ath_softc *sc = hw->priv;
++	struct ath_vif *avp = (void *)vif->drv_priv;
+ 	u64 tsf;
+ 
+ 	mutex_lock(&sc->mutex);
+ 	ath9k_ps_wakeup(sc);
+-	tsf = ath9k_hw_gettsf64(sc->sc_ah);
++	/* Get current TSF either from HW or kernel time. */
++	if (sc->cur_chan == avp->chanctx) {
++		tsf = ath9k_hw_gettsf64(sc->sc_ah);
++	} else {
++		tsf = sc->cur_chan->tsf_val +
++		      ath9k_hw_get_tsf_offset(&sc->cur_chan->tsf_ts, NULL);
++	}
+ 	ath9k_ps_restore(sc);
+ 	mutex_unlock(&sc->mutex);
+ 
+@@ -1839,10 +1846,14 @@ static void ath9k_set_tsf(struct ieee802
+ 			  u64 tsf)
+ {
+ 	struct ath_softc *sc = hw->priv;
++	struct ath_vif *avp = (void *)vif->drv_priv;
+ 
+ 	mutex_lock(&sc->mutex);
+ 	ath9k_ps_wakeup(sc);
+-	ath9k_hw_settsf64(sc->sc_ah, tsf);
++	getrawmonotonic(&avp->chanctx->tsf_ts);
++	if (sc->cur_chan == avp->chanctx)
++		ath9k_hw_settsf64(sc->sc_ah, tsf);
++	avp->chanctx->tsf_val = tsf;
+ 	ath9k_ps_restore(sc);
+ 	mutex_unlock(&sc->mutex);
+ }
+@@ -1850,11 +1861,15 @@ static void ath9k_set_tsf(struct ieee802
+ static void ath9k_reset_tsf(struct ieee80211_hw *hw, struct ieee80211_vif *vif)
+ {
+ 	struct ath_softc *sc = hw->priv;
++	struct ath_vif *avp = (void *)vif->drv_priv;
+ 
+ 	mutex_lock(&sc->mutex);
+ 
+ 	ath9k_ps_wakeup(sc);
+-	ath9k_hw_reset_tsf(sc->sc_ah);
++	getrawmonotonic(&avp->chanctx->tsf_ts);
++	if (sc->cur_chan == avp->chanctx)
++		ath9k_hw_reset_tsf(sc->sc_ah);
++	avp->chanctx->tsf_val = 0;
+ 	ath9k_ps_restore(sc);
+ 
+ 	mutex_unlock(&sc->mutex);