From: Simon Wunderlich <simon.wunderlich@xxxxxxxxxxxxx>
QCA 802.11n chips (especially AR9330/AR9340) sometimes end up in a state in
which a read of AR_CFG always returns 0xdeadbeef. This should not happen
when when the power_mode of the device is ATH9K_PM_AWAKE.
This problem is not yet detected by any other workaround in ath9k. No way
is known to reproduce the problem easily.
This patch originally developed by "Simon Wunderlich <simon.wunderlich@xxxxxxxxxxxxx>"
and "Sven Eckelmann <sven.eckelmann@xxxxxxxxxxxxx>"
Co-developed-by: Simon Wunderlich <sw@xxxxxxxxxxxxxxxxxx>
Co-developed-by: Sven Eckelmann <se@xxxxxxxxxxxxxxxxxx>
Signed-off-by: Issam Hamdi <ih@xxxxxxxxxxxxxxxxxx>
---
drivers/net/wireless/ath/ath9k/ath9k.h | 3 +++
drivers/net/wireless/ath/ath9k/debug.c | 1 +
drivers/net/wireless/ath/ath9k/debug.h | 1 +
drivers/net/wireless/ath/ath9k/init.c | 1 +
drivers/net/wireless/ath/ath9k/link.c | 31 ++++++++++++++++++++++++++
drivers/net/wireless/ath/ath9k/main.c | 4 ++++
6 files changed, 41 insertions(+)
diff --git a/drivers/net/wireless/ath/ath9k/ath9k.h b/drivers/net/wireless/ath/ath9k/ath9k.h
index 29ca65a732a6..c1ce081445a9 100644
--- a/drivers/net/wireless/ath/ath9k/ath9k.h
+++ b/drivers/net/wireless/ath/ath9k/ath9k.h
@@ -739,11 +739,13 @@ void ath9k_csa_update(struct ath_softc *sc);
#define ATH_ANI_MAX_SKIP_COUNT 10
#define ATH_PAPRD_TIMEOUT 100 /* msecs */
#define ATH_PLL_WORK_INTERVAL 100
+#define ATH_HANG_WORK_INTERVAL 4000
void ath_hw_check_work(struct work_struct *work);
void ath_reset_work(struct work_struct *work);
bool ath_hw_check(struct ath_softc *sc);
void ath_hw_pll_work(struct work_struct *work);
+void ath_hw_hang_work(struct work_struct *work);
void ath_paprd_calibrate(struct work_struct *work);
void ath_ani_calibrate(struct timer_list *t);
void ath_start_ani(struct ath_softc *sc);
@@ -1044,6 +1046,7 @@ struct ath_softc {
#endif
struct delayed_work hw_check_work;
struct delayed_work hw_pll_work;
+ struct delayed_work hw_hang_work;
struct timer_list sleep_timer;
#ifdef CONFIG_ATH9K_BTCOEX_SUPPORT
diff --git a/drivers/net/wireless/ath/ath9k/debug.c b/drivers/net/wireless/ath/ath9k/debug.c
index eff894958a73..6b2469a01f17 100644
--- a/drivers/net/wireless/ath/ath9k/debug.c
+++ b/drivers/net/wireless/ath/ath9k/debug.c
@@ -750,6 +750,7 @@ static int read_file_reset(struct seq_file *file, void *data)
[RESET_TYPE_CALIBRATION] = "Calibration error",
[RESET_TX_DMA_ERROR] = "Tx DMA stop error",
[RESET_RX_DMA_ERROR] = "Rx DMA stop error",
+ [RESET_TYPE_DEADBEEF] = "deadbeef hang",
};
int i;
diff --git a/drivers/net/wireless/ath/ath9k/debug.h b/drivers/net/wireless/ath/ath9k/debug.h
index 389459c04d14..6ebb6053a8c1 100644
--- a/drivers/net/wireless/ath/ath9k/debug.h
+++ b/drivers/net/wireless/ath/ath9k/debug.h
@@ -53,6 +53,7 @@ enum ath_reset_type {
RESET_TYPE_CALIBRATION,
RESET_TX_DMA_ERROR,
RESET_RX_DMA_ERROR,
+ RESET_TYPE_DEADBEEF,
__RESET_TYPE_MAX
};
diff --git a/drivers/net/wireless/ath/ath9k/init.c b/drivers/net/wireless/ath/ath9k/init.c
index f9e77c4624d9..833474d7281f 100644
--- a/drivers/net/wireless/ath/ath9k/init.c
+++ b/drivers/net/wireless/ath/ath9k/init.c
@@ -740,6 +740,7 @@ static int ath9k_init_softc(u16 devid, struct ath_softc *sc,
INIT_WORK(&sc->paprd_work, ath_paprd_calibrate);
INIT_DELAYED_WORK(&sc->hw_pll_work, ath_hw_pll_work);
INIT_DELAYED_WORK(&sc->hw_check_work, ath_hw_check_work);
+ INIT_DELAYED_WORK(&sc->hw_hang_work, ath_hw_hang_work);
ath9k_init_channel_context(sc);
diff --git a/drivers/net/wireless/ath/ath9k/link.c b/drivers/net/wireless/ath/ath9k/link.c
index d1e5767aab3c..37438960c278 100644
--- a/drivers/net/wireless/ath/ath9k/link.c
+++ b/drivers/net/wireless/ath/ath9k/link.c
@@ -142,6 +142,37 @@ void ath_hw_pll_work(struct work_struct *work)
msecs_to_jiffies(ATH_PLL_WORK_INTERVAL));
}
+static bool ath_hw_hang_deadbeef(struct ath_softc *sc)
+{
+ struct ath_common *common = ath9k_hw_common(sc->sc_ah);
+ u32 reg;
+
+ /* check for stucked MAC */
+ ath9k_ps_wakeup(sc);
+ reg = REG_READ(sc->sc_ah, AR_CFG);
+ ath9k_ps_restore(sc);
+
+ if (reg != 0xdeadbeef)
+ return false;
+
+ ath_dbg(common, RESET,
+ "0xdeadbeef hang is detected. Schedule chip reset\n");
+ ath9k_queue_reset(sc, RESET_TYPE_DEADBEEF);
+
+ return true;
+}
+
+void ath_hw_hang_work(struct work_struct *work)
+{
+ struct ath_softc *sc = container_of(work, struct ath_softc,
+ hw_hang_work.work);
+
+ ath_hw_hang_deadbeef(sc);
+
+ ieee80211_queue_delayed_work(sc->hw, &sc->hw_hang_work,
+ msecs_to_jiffies(ATH_HANG_WORK_INTERVAL));
+}
+
/*
* PA Pre-distortion.
*/
diff --git a/drivers/net/wireless/ath/ath9k/main.c b/drivers/net/wireless/ath/ath9k/main.c
index b92c89dad8de..024028ce8417 100644
--- a/drivers/net/wireless/ath/ath9k/main.c
+++ b/drivers/net/wireless/ath/ath9k/main.c
@@ -186,6 +186,7 @@ static void __ath_cancel_work(struct ath_softc *sc)
cancel_work_sync(&sc->paprd_work);
cancel_delayed_work_sync(&sc->hw_check_work);
cancel_delayed_work_sync(&sc->hw_pll_work);
+ cancel_delayed_work_sync(&sc->hw_hang_work);
#ifdef CONFIG_ATH9K_BTCOEX_SUPPORT
if (ath9k_hw_mci_is_enabled(sc->sc_ah))
@@ -208,6 +209,9 @@ void ath_restart_work(struct ath_softc *sc)
ieee80211_queue_delayed_work(sc->hw, &sc->hw_pll_work,
msecs_to_jiffies(ATH_PLL_WORK_INTERVAL));
+ ieee80211_queue_delayed_work(sc->hw, &sc->hw_hang_work,
+ msecs_to_jiffies(ATH_HANG_WORK_INTERVAL));
+
ath_start_ani(sc);
}
base-commit: 2b94751626a6d49bbe42a19cc1503bd391016bd5
--
2.39.2
