ath9k: fix channel time updates when the interface is idle

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@23410 3c298f89-4303-0410-b956-a3cf2f4a3e73

diff --git a/package/mac80211/patches/527-ath9k_ps_survey_fix.patch b/package/mac80211/patches/527-ath9k_ps_survey_fix.patch
new file mode 100644 (file)
index 0000000..f130f41
--- /dev/null
+++ b/package/mac80211/patches/527-ath9k_ps_survey_fix.patch
@@ -0,0 +1,54 @@
+--- a/drivers/net/wireless/ath/ath9k/main.c
++++ b/drivers/net/wireless/ath/ath9k/main.c
+@@ -122,6 +122,7 @@ bool ath9k_setpower(struct ath_softc *sc
+ 
+ void ath9k_ps_wakeup(struct ath_softc *sc)
+ {
++      struct ath_common *common = ath9k_hw_common(sc->sc_ah);
+       unsigned long flags;
+ 
+       spin_lock_irqsave(&sc->sc_pm_lock, flags);
+@@ -130,18 +131,33 @@ void ath9k_ps_wakeup(struct ath_softc *s
+ 
+       ath9k_hw_setpower(sc->sc_ah, ATH9K_PM_AWAKE);
+ 
++      /*
++       * While the hardware is asleep, the cycle counters contain no
++       * useful data. Better clear them now so that they don't mess up the
++       * ANI or survey data results.
++       */
++      spin_lock(&common->cc_lock);
++      ath_hw_cycle_counters_update(common);
++      memset(&common->cc_survey, 0, sizeof(common->cc_survey));
++      spin_unlock(&common->cc_lock);
++
+  unlock:
+       spin_unlock_irqrestore(&sc->sc_pm_lock, flags);
+ }
+ 
+ void ath9k_ps_restore(struct ath_softc *sc)
+ {
++      struct ath_common *common = ath9k_hw_common(sc->sc_ah);
+       unsigned long flags;
+ 
+       spin_lock_irqsave(&sc->sc_pm_lock, flags);
+       if (--sc->ps_usecount != 0)
+               goto unlock;
+ 
++      spin_lock(&common->cc_lock);
++      ath_hw_cycle_counters_update(common);
++      spin_unlock(&common->cc_lock);
++
+       if (sc->ps_idle)
+               ath9k_hw_setpower(sc->sc_ah, ATH9K_PM_FULL_SLEEP);
+       else if (sc->ps_enabled &&
+@@ -197,7 +213,8 @@ static void ath_update_survey_stats(stru
+       struct ath_cycle_counters *cc = &common->cc_survey;
+       unsigned int div = common->clockrate * 1000;
+ 
+-      ath_hw_cycle_counters_update(common);
++      if (ah->power_mode == ATH9K_PM_AWAKE)
++              ath_hw_cycle_counters_update(common);
+ 
+       if (cc->cycles > 0) {
+               survey->filled |= SURVEY_INFO_CHANNEL_TIME |