ath9k_hw: disable hardware ad-hoc flag on ar934x rev 3

On AR934x rev 3, settin the ad-hoc flag completely messes up hardware
state - beacons get stuck, almost no packets make it out, hardware is
constantly reset.

When leaving out that flag and setting up the hw like in AP mode, TSF
timers won't be automatically synced, but at least the rest works.

AR934x rev 2 and older are not affected by this bug

Signed-off-by: Felix Fietkau <nbd@openwrt.org>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

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

@@ -1189,9 +1189,12 @@ static void ath9k_hw_set_operating_mode(struct ath_hw *ah, int opmode)
 
 	switch (opmode) {
 	case NL80211_IFTYPE_ADHOC:
-		set |= AR_STA_ID1_ADHOC;
-		REG_SET_BIT(ah, AR_CFG, AR_CFG_AP_ADHOC_INDICATION);
-		break;
+		if (!AR_SREV_9340_13(ah)) {
+			set |= AR_STA_ID1_ADHOC;
+			REG_SET_BIT(ah, AR_CFG, AR_CFG_AP_ADHOC_INDICATION);
+			break;
+		}
+		/* fall through */
 	case NL80211_IFTYPE_MESH_POINT:
 	case NL80211_IFTYPE_AP:
 		set |= AR_STA_ID1_STA_AP;

drivers/net/wireless/ath/ath9k/reg.h

@@ -903,6 +903,10 @@
 #define AR_SREV_9340(_ah) \
 	(((_ah)->hw_version.macVersion == AR_SREV_VERSION_9340))
 
+#define AR_SREV_9340_13(_ah) \
+	(AR_SREV_9340((_ah)) && \
+	 ((_ah)->hw_version.macRev == AR_SREV_REVISION_9340_13))
+
 #define AR_SREV_9340_13_OR_LATER(_ah) \
 	(AR_SREV_9340((_ah)) && \
 	 ((_ah)->hw_version.macRev >= AR_SREV_REVISION_9340_13))