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- 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);
-
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