ath9k: Fix bug in configuring hw timer

Hw next tigger time is configured as current_tsf + (timer_period * 10) which
is wrong, it should be current_tsf + timer_period. The wrong hw timer configuration
would cause btcoex related issues.
Signed-off-by: Vasanthakumar Thiagarajan <vasanth@atheros.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

drivers/net/wireless/ath/ath9k/gpio.c

@@ -138,10 +138,10 @@ static void ath_detect_bt_priority(struct ath_softc *sc)
 
 static void ath9k_gen_timer_start(struct ath_hw *ah,
 				  struct ath_gen_timer *timer,
-				  u32 timer_next,
+				  u32 trig_timeout,
 				  u32 timer_period)
 {
-	ath9k_hw_gen_timer_start(ah, timer, timer_next, timer_period);
+	ath9k_hw_gen_timer_start(ah, timer, trig_timeout, timer_period);
 
 	if ((ah->imask & ATH9K_INT_GENTIMER) == 0) {
 		ath9k_hw_disable_interrupts(ah);
@@ -195,7 +195,7 @@ static void ath_btcoex_period_timer(unsigned long data)
 
 		timer_period = is_btscan ? btcoex->btscan_no_stomp :
 					   btcoex->btcoex_no_stomp;
-		ath9k_gen_timer_start(ah, btcoex->no_stomp_timer, 0,
+		ath9k_gen_timer_start(ah, btcoex->no_stomp_timer, timer_period,
 				      timer_period * 10);
 		btcoex->hw_timer_enabled = true;
 	}

drivers/net/wireless/ath/ath9k/hw.c

@@ -2430,11 +2430,11 @@ EXPORT_SYMBOL(ath_gen_timer_alloc);
 
 void ath9k_hw_gen_timer_start(struct ath_hw *ah,
 			      struct ath_gen_timer *timer,
-			      u32 timer_next,
+			      u32 trig_timeout,
 			      u32 timer_period)
 {
 	struct ath_gen_timer_table *timer_table = &ah->hw_gen_timers;
-	u32 tsf;
+	u32 tsf, timer_next;
 
 	BUG_ON(!timer_period);
 
@@ -2442,17 +2442,12 @@ void ath9k_hw_gen_timer_start(struct ath_hw *ah,
 
 	tsf = ath9k_hw_gettsf32(ah);
 
+	timer_next = tsf + trig_timeout;
+
 	ath_dbg(ath9k_hw_common(ah), ATH_DBG_HWTIMER,
 		"current tsf %x period %x timer_next %x\n",
 		tsf, timer_period, timer_next);
 
-	/*
-	 * Pull timer_next forward if the current TSF already passed it
-	 * because of software latency
-	 */
-	if (timer_next < tsf)
-		timer_next = tsf + timer_period;
-
 	/*
 	 * Program generic timer registers
 	 */