diff options
| author | Felix Fietkau <nbd@nbd.name> | 2017-02-02 10:14:51 +0100 |
|---|---|---|
| committer | Kalle Valo <kvalo@qca.qualcomm.com> | 2017-02-07 11:00:21 +0200 |
| commit | a34d0a0da1abae46a5f6ebd06fb0ec484ca099d9 (patch) | |
| tree | cebb096769375fe372b13545da083d4cb6c97100 /drivers/net/wireless/ath/ath9k/hw.c | |
| parent | d63ffc45c5d3df15f6fc8c73079458ce4a111995 (diff) | |
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>
Signed-off-by: Kalle Valo <kvalo@qca.qualcomm.com>
Diffstat (limited to 'drivers/net/wireless/ath/ath9k/hw.c')
| -rw-r--r-- | drivers/net/wireless/ath/ath9k/hw.c | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/drivers/net/wireless/ath/ath9k/hw.c b/drivers/net/wireless/ath/ath9k/hw.c index ac36873d6da4..8c5c2dd8fa7f 100644 --- a/drivers/net/wireless/ath/ath9k/hw.c +++ b/drivers/net/wireless/ath/ath9k/hw.c @@ -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); |