From: Sujith Manoharan <c_manoha@xxxxxxxxxxxxxxxx>
Beacon transmission would get stuck if the NAV is
an invalid value for some reason. Check and correct
the NAV value in the HW when this happens.
Signed-off-by: Sujith Manoharan <c_manoha@xxxxxxxxxxxxxxxx>
---
drivers/net/wireless/ath/ath9k/beacon.c | 2 ++
drivers/net/wireless/ath/ath9k/hw.c | 13 +++++++++++++
drivers/net/wireless/ath/ath9k/hw.h | 1 +
3 files changed, 16 insertions(+)
diff --git a/drivers/net/wireless/ath/ath9k/beacon.c b/drivers/net/wireless/ath/ath9k/beacon.c
index b5c16b3a..17be353 100644
--- a/drivers/net/wireless/ath/ath9k/beacon.c
+++ b/drivers/net/wireless/ath/ath9k/beacon.c
@@ -334,6 +334,8 @@ void ath9k_beacon_tasklet(unsigned long data)
if (ath9k_hw_numtxpending(ah, sc->beacon.beaconq) != 0) {
sc->beacon.bmisscnt++;
+ ath9k_hw_check_nav(ah);
+
if (!ath9k_hw_check_alive(ah))
ieee80211_queue_work(sc->hw, &sc->hw_check_work);
diff --git a/drivers/net/wireless/ath/ath9k/hw.c b/drivers/net/wireless/ath/ath9k/hw.c
index 260e0c6..7d6e35d 100644
--- a/drivers/net/wireless/ath/ath9k/hw.c
+++ b/drivers/net/wireless/ath/ath9k/hw.c
@@ -1656,6 +1656,19 @@ hang_check_iter:
return true;
}
+void ath9k_hw_check_nav(struct ath_hw *ah)
+{
+ struct ath_common *common = ath9k_hw_common(ah);
+ u32 val;
+
+ val = REG_READ(ah, 0x8084);
+ if (val != 0xdeadbeef && val > 0x7fff) {
+ ath_dbg(common, BSTUCK, "Abnormal NAV: 0x%x\n", val);
+ REG_WRITE(ah, 0x8084, 0);
+ }
+}
+EXPORT_SYMBOL(ath9k_hw_check_nav);
+
bool ath9k_hw_check_alive(struct ath_hw *ah)
{
int count = 50;
diff --git a/drivers/net/wireless/ath/ath9k/hw.h b/drivers/net/wireless/ath/ath9k/hw.h
index 88f67c3..8e1c675 100644
--- a/drivers/net/wireless/ath/ath9k/hw.h
+++ b/drivers/net/wireless/ath/ath9k/hw.h
@@ -1031,6 +1031,7 @@ void ath9k_hw_set11nmac2040(struct ath_hw *ah);
void ath9k_hw_beaconinit(struct ath_hw *ah, u32 next_beacon, u32 beacon_period);
void ath9k_hw_set_sta_beacon_timers(struct ath_hw *ah,
const struct ath9k_beacon_state *bs);
+void ath9k_hw_check_nav(struct ath_hw *ah);
bool ath9k_hw_check_alive(struct ath_hw *ah);
bool ath9k_hw_setpower(struct ath_hw *ah, enum ath9k_power_mode mode);
--
1.8.4
--
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