diff options
Diffstat (limited to 'package/kernel/mac80211/patches/355-ath9k_hw-check-if-the-chip-failed-to-wake-up.patch')
| -rw-r--r-- | package/kernel/mac80211/patches/355-ath9k_hw-check-if-the-chip-failed-to-wake-up.patch | 30 |
1 files changed, 30 insertions, 0 deletions
diff --git a/package/kernel/mac80211/patches/355-ath9k_hw-check-if-the-chip-failed-to-wake-up.patch b/package/kernel/mac80211/patches/355-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/355-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); + |