ath9k: improve suspend/resume reliability
Ensure that drv_start() always returns true, as a failing hw start usually
eventually leads to crashes when there's still a station entry present.
Call a power-on reset after a resume and after a hw reset failure to bring
the hardware back to life again.
Signed-off-by: Felix Fietkau <nbd@openwrt.org>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
diff --git a/drivers/net/wireless/ath/ath9k/hw.c b/drivers/net/wireless/ath/ath9k/hw.c
index f9a6ec5..8e1559a 100644
--- a/drivers/net/wireless/ath/ath9k/hw.c
+++ b/drivers/net/wireless/ath/ath9k/hw.c
@@ -1450,9 +1450,14 @@
REG_WRITE(ah, AR_RTC_FORCE_WAKE,
AR_RTC_FORCE_WAKE_EN | AR_RTC_FORCE_WAKE_ON_INT);
+ if (!ah->reset_power_on)
+ type = ATH9K_RESET_POWER_ON;
+
switch (type) {
case ATH9K_RESET_POWER_ON:
ret = ath9k_hw_set_reset_power_on(ah);
+ if (!ret)
+ ah->reset_power_on = true;
break;
case ATH9K_RESET_WARM:
case ATH9K_RESET_COLD:
diff --git a/drivers/net/wireless/ath/ath9k/hw.h b/drivers/net/wireless/ath/ath9k/hw.h
index 566a4ce..dbc1b7a 100644
--- a/drivers/net/wireless/ath/ath9k/hw.h
+++ b/drivers/net/wireless/ath/ath9k/hw.h
@@ -741,6 +741,7 @@
u32 rfkill_polarity;
u32 ah_flags;
+ bool reset_power_on;
bool htc_reset_init;
enum nl80211_iftype opmode;
diff --git a/drivers/net/wireless/ath/ath9k/main.c b/drivers/net/wireless/ath/ath9k/main.c
index 31ab82e..e2fe713 100644
--- a/drivers/net/wireless/ath/ath9k/main.c
+++ b/drivers/net/wireless/ath/ath9k/main.c
@@ -639,8 +639,7 @@
ath_err(common,
"Unable to reset hardware; reset status %d (freq %u MHz)\n",
r, curchan->center_freq);
- spin_unlock_bh(&sc->sc_pcu_lock);
- goto mutex_unlock;
+ ah->reset_power_on = false;
}
/* Setup our intr mask. */
@@ -665,11 +664,8 @@
clear_bit(SC_OP_INVALID, &sc->sc_flags);
sc->sc_ah->is_monitoring = false;
- if (!ath_complete_reset(sc, false)) {
- r = -EIO;
- spin_unlock_bh(&sc->sc_pcu_lock);
- goto mutex_unlock;
- }
+ if (!ath_complete_reset(sc, false))
+ ah->reset_power_on = false;
if (ah->led_pin >= 0) {
ath9k_hw_cfg_output(ah, ah->led_pin,
@@ -688,12 +684,11 @@
if (ah->caps.pcie_lcr_extsync_en && common->bus_ops->extn_synch_en)
common->bus_ops->extn_synch_en(common);
-mutex_unlock:
mutex_unlock(&sc->mutex);
ath9k_ps_restore(sc);
- return r;
+ return 0;
}
static void ath9k_tx(struct ieee80211_hw *hw,
diff --git a/drivers/net/wireless/ath/ath9k/pci.c b/drivers/net/wireless/ath/ath9k/pci.c
index 270abf7..f088f4b 100644
--- a/drivers/net/wireless/ath/ath9k/pci.c
+++ b/drivers/net/wireless/ath/ath9k/pci.c
@@ -326,7 +326,8 @@
struct pci_dev *pdev = to_pci_dev(device);
struct ieee80211_hw *hw = pci_get_drvdata(pdev);
struct ath_softc *sc = hw->priv;
- struct ath_common *common = ath9k_hw_common(sc->sc_ah);
+ struct ath_hw *ah = sc->sc_ah;
+ struct ath_common *common = ath9k_hw_common(ah);
u32 val;
/*
@@ -339,6 +340,7 @@
pci_write_config_dword(pdev, 0x40, val & 0xffff00ff);
ath_pci_aspm_init(common);
+ ah->reset_power_on = false;
return 0;
}