--- /dev/null
+--- a/drivers/net/wireless/ath/ath9k/hw.c
++++ b/drivers/net/wireless/ath/ath9k/hw.c
+@@ -1846,7 +1846,8 @@ static void ath9k_set_power_sleep(struct
+ }
+
+ /* Clear Bit 14 of AR_WA after putting chip into Full Sleep mode. */
+- REG_WRITE(ah, AR_WA, ah->WARegVal & ~AR_WA_D3_L1_DISABLE);
++ if (AR_SREV_9300_20_OR_LATER(ah))
++ REG_WRITE(ah, AR_WA, ah->WARegVal & ~AR_WA_D3_L1_DISABLE);
+ }
+
+ /*