+@@ -914,6 +914,13 @@ static void ath9k_hw_init_interrupt_mask
+ }
+ }
+
++static void ath9k_hw_set_sifs_time(struct ath_hw *ah, u32 us)
++{
++ u32 val = ath9k_hw_mac_to_clks(ah, us - 2);
++ val = min(val, (u32) 0xFFFF);
++ REG_WRITE(ah, AR_D_GBL_IFS_SIFS, val);
++}
++
+ static void ath9k_hw_setslottime(struct ath_hw *ah, u32 us)
+ {
+ u32 val = ath9k_hw_mac_to_clks(ah, us);
+@@ -951,25 +958,60 @@ static bool ath9k_hw_set_global_txtimeou