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-rw-r--r--package/kernel/mac80211/patches/315-ath9k_hw-check-if-the-chip-failed-to-wake-up.patch30
1 files changed, 30 insertions, 0 deletions
diff --git a/package/kernel/mac80211/patches/315-ath9k_hw-check-if-the-chip-failed-to-wake-up.patch b/package/kernel/mac80211/patches/315-ath9k_hw-check-if-the-chip-failed-to-wake-up.patch
new file mode 100644
index 0000000000..b0cb74ad05
--- /dev/null
+++ b/package/kernel/mac80211/patches/315-ath9k_hw-check-if-the-chip-failed-to-wake-up.patch
@@ -0,0 +1,30 @@
+From: Felix Fietkau <nbd@nbd.name>
+Date: Wed, 25 Jan 2017 12:58:17 +0100
+Subject: [PATCH] ath9k_hw: check if the chip failed to wake up
+
+In an RFC patch, Sven Eckelmann and Simon Wunderlich reported:
+
+"QCA 802.11n chips (especially AR9330/AR9340) sometimes end up in a
+state in which a read of AR_CFG always returns 0xdeadbeef.
+This should not happen when when the power_mode of the device is
+ATH9K_PM_AWAKE."
+
+Include the check for the default register state in the existing MAC
+hang check.
+
+Signed-off-by: Felix Fietkau <nbd@nbd.name>
+---
+
+--- a/drivers/net/wireless/ath/ath9k/hw.c
++++ b/drivers/net/wireless/ath/ath9k/hw.c
+@@ -1624,6 +1624,10 @@ bool ath9k_hw_check_alive(struct ath_hw
+ int count = 50;
+ u32 reg, last_val;
+
++ /* Check if chip failed to wake up */
++ if (REG_READ(ah, AR_CFG) == 0xdeadbeef)
++ return false;
++
+ if (AR_SREV_9300(ah))
+ return !ath9k_hw_detect_mac_hang(ah);
+