ath9k: enable the baseband watchdog events for AR9003

This enables the baseband watchdog events for the AR9003
family on ath9k. Upon an a baseband watchdog interrupt we reset
the hardware, this should address corner case conditions where
normal operation can stall. Enable ATH_DBG_RESET to be able
to review details of the bb watchdog interrupt once it happens.
If you're curious how often this happens just grep the debugfs
interrupt file.

Cc: Sam Ng <sam.ng@atheros.com>
Cc: Paul Shaw <paul.shaw@atheros.com>
Cc: Don Breslin <don.breslin@atheros.com>
Cc: Cliff Holden <cliff.holden@atheros.com
Signed-off-by: Luis R. Rodriguez <lrodriguez@atheros.com
Signed-off-by: John W. Linville <linville@tuxdriver.com>

3 files changed, 16 insertions, 1 deletions

diff --git a/drivers/net/wireless/ath/ath9k/debug.c b/drivers/net/wireless/ath/ath9k/debug.c
index 29898f8d1893..ee8387740ebe 100644
--- a/drivers/net/wireless/ath/ath9k/debug.c
+++ b/drivers/net/wireless/ath/ath9k/debug.c
@@ -269,6 +269,8 @@ void ath_debug_stat_interrupt(struct ath_softc *sc, enum ath9k_int status)
                         sc->debug.stats.istats.rxlp++;
                 if (status & ATH9K_INT_RXHP)
                         sc->debug.stats.istats.rxhp++;
+                if (status & ATH9K_INT_BB_WATCHDOG)
+                        sc->debug.stats.istats.bb_watchdog++;
         } else {
                 if (status & ATH9K_INT_RX)
                         sc->debug.stats.istats.rxok++;
@@ -319,6 +321,9 @@ static ssize_t read_file_interrupt(struct file *file, char __user *user_buf,
                         "%8s: %10u\n", "RXLP", sc->debug.stats.istats.rxlp);
                 len += snprintf(buf + len, sizeof(buf) - len,
                         "%8s: %10u\n", "RXHP", sc->debug.stats.istats.rxhp);
+                len += snprintf(buf + len, sizeof(buf) - len,
+                        "%8s: %10u\n", "WATCHDOG",
+                        sc->debug.stats.istats.bb_watchdog);
         } else {
                 len += snprintf(buf + len, sizeof(buf) - len,
                         "%8s: %10u\n", "RX", sc->debug.stats.istats.rxok);
diff --git a/drivers/net/wireless/ath/ath9k/debug.h b/drivers/net/wireless/ath/ath9k/debug.h
index 5147b8709e10..5d21704e87ff 100644
--- a/drivers/net/wireless/ath/ath9k/debug.h
+++ b/drivers/net/wireless/ath/ath9k/debug.h
@@ -53,6 +53,7 @@ struct ath_buf;
  * @cabend: RX End of CAB traffic
  * @dtimsync: DTIM sync lossage
  * @dtim: RX Beacon with DTIM
+ * @bb_watchdog: Baseband watchdog
  */
 struct ath_interrupt_stats {
         u32 total;
@@ -76,6 +77,7 @@ struct ath_interrupt_stats {
         u32 cabend;
         u32 dtimsync;
         u32 dtim;
+        u32 bb_watchdog;
 };
 
 struct ath_rc_stats {
diff --git a/drivers/net/wireless/ath/ath9k/main.c b/drivers/net/wireless/ath/ath9k/main.c
index abfa0493236f..b98b2f2ed07d 100644
--- a/drivers/net/wireless/ath/ath9k/main.c
+++ b/drivers/net/wireless/ath/ath9k/main.c
@@ -520,6 +520,12 @@ irqreturn_t ath_isr(int irq, void *dev)
             !(ah->caps.hw_caps & ATH9K_HW_CAP_EDMA)))
                 goto chip_reset;
 
+        if ((ah->caps.hw_caps & ATH9K_HW_CAP_EDMA) &&
+            (status & ATH9K_INT_BB_WATCHDOG)) {
+                ar9003_hw_bb_watchdog_dbg_info(ah);
+                goto chip_reset;
+        }
+
         if (status & ATH9K_INT_SWBA)
                 tasklet_schedule(&sc->bcon_tasklet);
 
@@ -1195,7 +1201,9 @@ static int ath9k_start(struct ieee80211_hw *hw)
                     ATH9K_INT_GLOBAL;
 
         if (ah->caps.hw_caps & ATH9K_HW_CAP_EDMA)
-                ah->imask |= ATH9K_INT_RXHP | ATH9K_INT_RXLP;
+                ah->imask |= ATH9K_INT_RXHP |
+                             ATH9K_INT_RXLP |
+                             ATH9K_INT_BB_WATCHDOG;
         else
                 ah->imask |= ATH9K_INT_RX;