1 files changed, 79 insertions, 0 deletions
diff --git a/package/kernel/mac80211/patches/551-ath9k-ar933x-usb-hang-workaround.patch b/package/kernel/mac80211/patches/551-ath9k-ar933x-usb-hang-workaround.patch
new file mode 100644
index 0000000000..10280d97ae
--- /dev/null
+++ b/package/kernel/mac80211/patches/551-ath9k-ar933x-usb-hang-workaround.patch
@@ -0,0 +1,79 @@
+--- a/drivers/net/wireless/ath/ath9k/hw.c
++++ b/drivers/net/wireless/ath/ath9k/hw.c
+@@ -215,6 +215,19 @@ void ath9k_hw_get_channel_centers(struct
+ 		centers->synth_center + (extoff * HT40_CHANNEL_CENTER_SHIFT);
+ }
+ 
++static inline void ath9k_hw_disable_pll_lock_detect(struct ath_hw *ah)
++{
++	/* On AR9330 and AR9340 devices, some PHY registers must be
++	 * tuned to gain better stability/performance. These registers
++	 * might be changed while doing wlan reset so the registers must
++	 * be reprogrammed after each reset.
++	 */
++	REG_CLR_BIT(ah, AR_PHY_USB_CTRL1, BIT(20));
++	REG_RMW(ah, AR_PHY_USB_CTRL2,
++		(1 << 21) | (0xf << 22),
++		(1 << 21) | (0x3 << 22));
++}
++
+ /******************/
+ /* Chip Revisions */
+ /******************/
+@@ -1337,6 +1350,9 @@ static bool ath9k_hw_set_reset(struct at
+ 	if (AR_SREV_9100(ah))
+ 		udelay(50);
+ 
++	if (AR_SREV_9330(ah) || AR_SREV_9340(ah))
++		ath9k_hw_disable_pll_lock_detect(ah);
++
+ 	return true;
+ }
+ 
+@@ -1436,6 +1452,9 @@ static bool ath9k_hw_chip_reset(struct a
+ 		ar9003_hw_internal_regulator_apply(ah);
+ 	ath9k_hw_init_pll(ah, chan);
+ 
++	if (AR_SREV_9330(ah) || AR_SREV_9340(ah))
++		ath9k_hw_disable_pll_lock_detect(ah);
++
+ 	return true;
+ }
+ 
+@@ -1730,8 +1749,14 @@ static int ath9k_hw_do_fastcc(struct ath
+ 	if (AR_SREV_9271(ah))
+ 		ar9002_hw_load_ani_reg(ah, chan);
+ 
++	if (AR_SREV_9330(ah) || AR_SREV_9340(ah))
++		ath9k_hw_disable_pll_lock_detect(ah);
++
+ 	return 0;
+ fail:
++	if (AR_SREV_9330(ah) || AR_SREV_9340(ah))
++		ath9k_hw_disable_pll_lock_detect(ah);
++
+ 	return -EINVAL;
+ }
+ 
+@@ -1959,6 +1984,9 @@ int ath9k_hw_reset(struct ath_hw *ah, st
+ 	if (AR_SREV_9565(ah) && common->bt_ant_diversity)
+ 		REG_SET_BIT(ah, AR_BTCOEX_WL_LNADIV, AR_BTCOEX_WL_LNADIV_FORCE_ON);
+ 
++	if (AR_SREV_9330(ah) || AR_SREV_9340(ah))
++		ath9k_hw_disable_pll_lock_detect(ah);
++
+ 	return 0;
+ }
+ EXPORT_SYMBOL(ath9k_hw_reset);
+--- a/drivers/net/wireless/ath/ath9k/phy.h
++++ b/drivers/net/wireless/ath/ath9k/phy.h
+@@ -48,6 +48,9 @@
+ #define AR_PHY_PLL_CONTROL 0x16180
+ #define AR_PHY_PLL_MODE 0x16184
+ 
++#define AR_PHY_USB_CTRL1	0x16c84
++#define AR_PHY_USB_CTRL2	0x16c88
++
+ enum ath9k_ant_div_comb_lna_conf {
+ 	ATH_ANT_DIV_COMB_LNA1_MINUS_LNA2,
+ 	ATH_ANT_DIV_COMB_LNA2,