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[2/4] ath9k_hw: check if the chip failed to wake up

Message ID 20170125163654.66431-2-nbd@nbd.name (mailing list archive)
State Changes Requested
Delegated to: Kalle Valo
Headers show

Commit Message

Felix Fietkau Jan. 25, 2017, 4:36 p.m. UTC 
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>
---
 drivers/net/wireless/ath/ath9k/hw.c | 4 ++++
 1 file changed, 4 insertions(+)
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Patch

diff --git a/drivers/net/wireless/ath/ath9k/hw.c b/drivers/net/wireless/ath/ath9k/hw.c
index 6989f89b3116..11fd98df2c43 100644
--- a/drivers/net/wireless/ath/ath9k/hw.c
+++ b/drivers/net/wireless/ath/ath9k/hw.c
@@ -1623,6 +1623,10 @@  bool ath9k_hw_check_alive(struct ath_hw *ah)
 	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);