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ath9k: Fix IDLE Powersave 

* PS_WAIT_FOR_TX_ACK is used in network-sleep mode and checking
  it for handling IDLE transitions is incorrect. Fix this.

* RX PCU/DMA engines have to be stopped before setting the chip into
  full-sleep mode - otherwise the chip becomes mute.

* Make things a bit clear by checking explicitly for network-sleep
  mode in the tx() routine and add a couple of debug statements
  to aid PS debugging.

Signed-off-by: Sujith Manoharan <c_manoha@qca.qualcomm.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
This commit is contained in:
Sujith Manoharan 2012-04-24 10:23:20 +05:30 committed by John W. Linville
parent 7e3ed02c6e
commit ad12886091
1 changed files with 26 additions and 17 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

43
drivers/net/wireless/ath/ath9k/main.c
View File

@ -113,21 +113,25 @@ void ath9k_ps_restore(struct ath_softc *sc)
struct ath_common *common = ath9k_hw_common(sc->sc_ah);
enum ath9k_power_mode mode;
unsigned long flags;
bool reset;
spin_lock_irqsave(&sc->sc_pm_lock, flags);
if (--sc->ps_usecount != 0)
goto unlock;
if (sc->ps_idle && (sc->ps_flags & PS_WAIT_FOR_TX_ACK))
if (sc->ps_idle) {
ath9k_hw_setrxabort(sc->sc_ah, 1);
ath9k_hw_stopdmarecv(sc->sc_ah, &reset);
mode = ATH9K_PM_FULL_SLEEP;
else if (sc->ps_enabled &&
!(sc->ps_flags & (PS_WAIT_FOR_BEACON |
PS_WAIT_FOR_CAB |
PS_WAIT_FOR_PSPOLL_DATA |
PS_WAIT_FOR_TX_ACK)))
} else if (sc->ps_enabled &&
!(sc->ps_flags & (PS_WAIT_FOR_BEACON |
PS_WAIT_FOR_CAB |
PS_WAIT_FOR_PSPOLL_DATA |
PS_WAIT_FOR_TX_ACK))) {
mode = ATH9K_PM_NETWORK_SLEEP;
else
} else {
goto unlock;
}
spin_lock(&common->cc_lock);
ath_hw_cycle_counters_update(common);
@ -1100,14 +1104,7 @@ static void ath9k_tx(struct ieee80211_hw *hw, struct sk_buff *skb)
}
}
/*
* Cannot tx while the hardware is in full sleep, it first needs a full
* chip reset to recover from that
*/
if (unlikely(sc->sc_ah->power_mode == ATH9K_PM_FULL_SLEEP))
goto exit;
if (unlikely(sc->sc_ah->power_mode != ATH9K_PM_AWAKE)) {
if (unlikely(sc->sc_ah->power_mode == ATH9K_PM_NETWORK_SLEEP)) {
/*
* We are using PS-Poll and mac80211 can request TX while in
* power save mode. Need to wake up hardware for the TX to be
@ -1126,12 +1123,21 @@ static void ath9k_tx(struct ieee80211_hw *hw, struct sk_buff *skb)
}
/*
* The actual restore operation will happen only after
* the sc_flags bit is cleared. We are just dropping
* the ps_flags bit is cleared. We are just dropping
* the ps_usecount here.
*/
ath9k_ps_restore(sc);
}
/*
* Cannot tx while the hardware is in full sleep, it first needs a full
* chip reset to recover from that
*/
if (unlikely(sc->sc_ah->power_mode == ATH9K_PM_FULL_SLEEP)) {
ath_err(common, "TX while HW is in FULL_SLEEP mode\n");
goto exit;
}
memset(&txctl, 0, sizeof(struct ath_tx_control));
txctl.txq = sc->tx.txq_map[skb_get_queue_mapping(skb)];
@ -1528,6 +1534,7 @@ static void ath9k_remove_interface(struct ieee80211_hw *hw,
static void ath9k_enable_ps(struct ath_softc *sc)
{
struct ath_hw *ah = sc->sc_ah;
struct ath_common *common = ath9k_hw_common(ah);
sc->ps_enabled = true;
if (!(ah->caps.hw_caps & ATH9K_HW_CAP_AUTOSLEEP)) {
@ -1537,11 +1544,13 @@ static void ath9k_enable_ps(struct ath_softc *sc)
}
ath9k_hw_setrxabort(ah, 1);
}
ath_dbg(common, PS, "PowerSave enabled\n");
}
static void ath9k_disable_ps(struct ath_softc *sc)
{
struct ath_hw *ah = sc->sc_ah;
struct ath_common *common = ath9k_hw_common(ah);
sc->ps_enabled = false;
ath9k_hw_setpower(ah, ATH9K_PM_AWAKE);
@ -1556,7 +1565,7 @@ static void ath9k_disable_ps(struct ath_softc *sc)
ath9k_hw_set_interrupts(ah);
}
}
ath_dbg(common, PS, "PowerSave disabled\n");
}
static int ath9k_config(struct ieee80211_hw *hw, u32 changed)