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Commit ff738afb authored by Felix Fietkau's avatar Felix Fietkau Committed by Greg Kroah-Hartman
Browse files

ath9k_hw: check if the chip failed to wake up 



commit a34d0a0da1abae46a5f6ebd06fb0ec484ca099d9 upstream.

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: default avatarFelix Fietkau <nbd@nbd.name>
Signed-off-by: default avatarKalle Valo <kvalo@qca.qualcomm.com>
Cc: Amit Pundir <amit.pundir@linaro.org>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent faf6fd75

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

+4 −0
Original line number Diff line number Diff line
@@ -1603,6 +1603,10 @@ 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);