ath9k: Fix wifi disconnection when collocated bt scan is active
As all bt packets are priority traffic during bt scan, wifi
will get disconnected when bt scan lasts for few seconds. Fix
this by allocating 10% of bt period time (4.5ms) to wifi fully.
Signed-off-by: Vasanthakumar Thiagarajan <vasanth@atheros.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
diff --git a/drivers/net/wireless/ath/ath9k/ath9k.h b/drivers/net/wireless/ath/ath9k/ath9k.h
index bf3d4c4..bdbcc70 100644
--- a/drivers/net/wireless/ath/ath9k/ath9k.h
+++ b/drivers/net/wireless/ath/ath9k/ath9k.h
@@ -364,6 +364,7 @@
int bt_stomp_type; /* Types of BT stomping */
u32 btcoex_no_stomp; /* in usec */
u32 btcoex_period; /* in usec */
+ u32 btscan_no_stomp; /* in usec */
struct ath_gen_timer *no_stomp_timer; /* Timer for no BT stomping */
};
@@ -429,6 +430,7 @@
#define SC_OP_SCANNING BIT(10)
#define SC_OP_TSF_RESET BIT(11)
#define SC_OP_BT_PRIORITY_DETECTED BIT(12)
+#define SC_OP_BT_SCAN BIT(13)
/* Powersave flags */
#define PS_WAIT_FOR_BEACON BIT(0)
diff --git a/drivers/net/wireless/ath/ath9k/btcoex.h b/drivers/net/wireless/ath/ath9k/btcoex.h
index 1ba31a7..1ee5a15 100644
--- a/drivers/net/wireless/ath/ath9k/btcoex.h
+++ b/drivers/net/wireless/ath/ath9k/btcoex.h
@@ -25,10 +25,12 @@
#define ATH_BTCOEX_DEF_BT_PERIOD 45
#define ATH_BTCOEX_DEF_DUTY_CYCLE 55
+#define ATH_BTCOEX_BTSCAN_DUTY_CYCLE 90
#define ATH_BTCOEX_BMISS_THRESH 50
#define ATH_BT_PRIORITY_TIME_THRESHOLD 1000 /* ms */
#define ATH_BT_CNT_THRESHOLD 3
+#define ATH_BT_CNT_SCAN_THRESHOLD 15
enum ath_btcoex_scheme {
ATH_BTCOEX_CFG_NONE,
diff --git a/drivers/net/wireless/ath/ath9k/gpio.c b/drivers/net/wireless/ath/ath9k/gpio.c
index e204bd2..deab8be 100644
--- a/drivers/net/wireless/ath/ath9k/gpio.c
+++ b/drivers/net/wireless/ath/ath9k/gpio.c
@@ -230,12 +230,17 @@
if (time_after(jiffies, btcoex->bt_priority_time +
msecs_to_jiffies(ATH_BT_PRIORITY_TIME_THRESHOLD))) {
- if (btcoex->bt_priority_cnt >= ATH_BT_CNT_THRESHOLD) {
+ sc->sc_flags &= ~(SC_OP_BT_PRIORITY_DETECTED | SC_OP_BT_SCAN);
+ /* Detect if colocated bt started scanning */
+ if (btcoex->bt_priority_cnt >= ATH_BT_CNT_SCAN_THRESHOLD) {
+ ath_print(ath9k_hw_common(sc->sc_ah), ATH_DBG_BTCOEX,
+ "BT scan detected");
+ sc->sc_flags |= (SC_OP_BT_SCAN |
+ SC_OP_BT_PRIORITY_DETECTED);
+ } else if (btcoex->bt_priority_cnt >= ATH_BT_CNT_THRESHOLD) {
ath_print(ath9k_hw_common(sc->sc_ah), ATH_DBG_BTCOEX,
"BT priority traffic detected");
sc->sc_flags |= SC_OP_BT_PRIORITY_DETECTED;
- } else {
- sc->sc_flags &= ~SC_OP_BT_PRIORITY_DETECTED;
}
btcoex->bt_priority_cnt = 0;
@@ -316,12 +321,17 @@
struct ath_softc *sc = (struct ath_softc *) data;
struct ath_hw *ah = sc->sc_ah;
struct ath_btcoex *btcoex = &sc->btcoex;
+ u32 timer_period;
+ bool is_btscan;
ath_detect_bt_priority(sc);
+ is_btscan = sc->sc_flags & SC_OP_BT_SCAN;
+
spin_lock_bh(&btcoex->btcoex_lock);
- ath9k_btcoex_bt_stomp(sc, btcoex->bt_stomp_type);
+ ath9k_btcoex_bt_stomp(sc, is_btscan ? ATH_BTCOEX_STOMP_ALL :
+ btcoex->bt_stomp_type);
spin_unlock_bh(&btcoex->btcoex_lock);
@@ -329,11 +339,12 @@
if (btcoex->hw_timer_enabled)
ath9k_gen_timer_stop(ah, btcoex->no_stomp_timer);
+ timer_period = is_btscan ? btcoex->btscan_no_stomp :
+ btcoex->btcoex_no_stomp;
ath9k_gen_timer_start(ah,
btcoex->no_stomp_timer,
(ath9k_hw_gettsf32(ah) +
- btcoex->btcoex_no_stomp),
- btcoex->btcoex_no_stomp * 10);
+ timer_period), timer_period * 10);
btcoex->hw_timer_enabled = true;
}
@@ -350,13 +361,14 @@
struct ath_softc *sc = (struct ath_softc *)arg;
struct ath_hw *ah = sc->sc_ah;
struct ath_btcoex *btcoex = &sc->btcoex;
+ bool is_btscan = sc->sc_flags & SC_OP_BT_SCAN;
ath_print(ath9k_hw_common(ah), ATH_DBG_BTCOEX,
"no stomp timer running \n");
spin_lock_bh(&btcoex->btcoex_lock);
- if (btcoex->bt_stomp_type == ATH_BTCOEX_STOMP_LOW)
+ if (btcoex->bt_stomp_type == ATH_BTCOEX_STOMP_LOW || is_btscan)
ath9k_btcoex_bt_stomp(sc, ATH_BTCOEX_STOMP_NONE);
else if (btcoex->bt_stomp_type == ATH_BTCOEX_STOMP_ALL)
ath9k_btcoex_bt_stomp(sc, ATH_BTCOEX_STOMP_LOW);
@@ -371,6 +383,8 @@
btcoex->btcoex_period = ATH_BTCOEX_DEF_BT_PERIOD * 1000;
btcoex->btcoex_no_stomp = (100 - ATH_BTCOEX_DEF_DUTY_CYCLE) *
btcoex->btcoex_period / 100;
+ btcoex->btscan_no_stomp = (100 - ATH_BTCOEX_BTSCAN_DUTY_CYCLE) *
+ btcoex->btcoex_period / 100;
setup_timer(&btcoex->period_timer, ath_btcoex_period_timer,
(unsigned long) sc);
@@ -405,7 +419,7 @@
btcoex->bt_priority_cnt = 0;
btcoex->bt_priority_time = jiffies;
- sc->sc_flags &= ~SC_OP_BT_PRIORITY_DETECTED;
+ sc->sc_flags &= ~(SC_OP_BT_PRIORITY_DETECTED | SC_OP_BT_SCAN);
mod_timer(&btcoex->period_timer, jiffies);
}
diff --git a/drivers/net/wireless/ath/ath9k/reg.h b/drivers/net/wireless/ath/ath9k/reg.h
index 8e653fb..72cfa8e 100644
--- a/drivers/net/wireless/ath/ath9k/reg.h
+++ b/drivers/net/wireless/ath/ath9k/reg.h
@@ -1547,9 +1547,9 @@
#define AR_BT_COEX_WEIGHT 0x8174
#define AR_BT_COEX_WGHT 0xff55
-#define AR_STOMP_ALL_WLAN_WGHT 0xffcc
-#define AR_STOMP_LOW_WLAN_WGHT 0xaaa8
-#define AR_STOMP_NONE_WLAN_WGHT 0xaa00
+#define AR_STOMP_ALL_WLAN_WGHT 0xfcfc
+#define AR_STOMP_LOW_WLAN_WGHT 0xa8a8
+#define AR_STOMP_NONE_WLAN_WGHT 0x0000
#define AR_BTCOEX_BT_WGHT 0x0000ffff
#define AR_BTCOEX_BT_WGHT_S 0
#define AR_BTCOEX_WL_WGHT 0xffff0000