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| author | Felix Fietkau <nbd@nbd.name> | 2017-01-25 15:32:18 +0100 |
|---|---|---|
| committer | Felix Fietkau <nbd@nbd.name> | 2017-01-25 16:25:48 +0100 |
| commit | b94177e10fc72f9309eae7459c3570e5c080e960 (patch) | |
| tree | 26efa9c6172b394c2113926cfa7b6aad6c9ebc1f /package/kernel/mac80211/patches/355-ath9k_hw-check-if-the-chip-failed-to-wake-up.patch | |
| parent | 4cacc1c5f5e01594d4e9148a7b34946845424e24 (diff) | |
| download | upstream-b94177e10fc72f9309eae7459c3570e5c080e960.tar.gz upstream-b94177e10fc72f9309eae7459c3570e5c080e960.tar.bz2 upstream-b94177e10fc72f9309eae7459c3570e5c080e960.zip | |
ath9k: add stability fixes for long standing hang issues (FS#13, #34, #373, #383)
The radio would stop communicating completely. This issue was easiest to
trigger on AR913x devices, e.g. the TP-Link TL-WR1043ND, but other
hardware was occasionally affected as well.
The most critical issue was a race condition in disabling/enabling IRQs
between the IRQ handler and the IRQ processing tasklet
Signed-off-by: Felix Fietkau <nbd@nbd.name>
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); + |