ath9k: Check WOW triggers properly

This patch makes sure that valid WOW triggers
are present before trying to suspend the device.
Also, introduce and use ATH_OP_WOW_ENABLED to
bypass PCI suspend and clear it in resume().

Signed-off-by: Sujith Manoharan <c_manoha@qca.qualcomm.com>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>

diff --git a/drivers/net/wireless/ath/ath.h b/drivers/net/wireless/ath/ath.h
index ccba4fe..1eebe2e 100644 (file)
--- a/drivers/net/wireless/ath/ath.h
+++ b/drivers/net/wireless/ath/ath.h
@@ -64,6 +64,7 @@ enum ath_op_flags {
        ATH_OP_HW_RESET,
        ATH_OP_SCANNING,
        ATH_OP_MULTI_CHANNEL,
+       ATH_OP_WOW_ENABLED,
 };
 
 enum ath_bus_type {

diff --git a/drivers/net/wireless/ath/ath9k/pci.c b/drivers/net/wireless/ath/ath9k/pci.c
index cc5c681..e6fef1b 100644 (file)
--- a/drivers/net/wireless/ath/ath9k/pci.c
+++ b/drivers/net/wireless/ath/ath9k/pci.c
@@ -998,9 +998,12 @@ static int ath_pci_suspend(struct device *device)
        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);
 
-       if (sc->wow_enabled)
+       if (test_bit(ATH_OP_WOW_ENABLED, &common->op_flags)) {
+               dev_info(&pdev->dev, "WOW is enabled, bypassing PCI suspend\n");
                return 0;
+       }
 
        /* The device has to be moved to FULLSLEEP forcibly.
         * Otherwise the chip never moved to full sleep,

diff --git a/drivers/net/wireless/ath/ath9k/wow.c b/drivers/net/wireless/ath/ath9k/wow.c
index 8bcbaa9..c0c564d 100644 (file)
--- a/drivers/net/wireless/ath/ath9k/wow.c
+++ b/drivers/net/wireless/ath/ath9k/wow.c
@@ -23,21 +23,21 @@ static const struct wiphy_wowlan_support ath9k_wowlan_support = {
        .pattern_max_len = MAX_PATTERN_SIZE,
 };
 
-static void ath9k_wow_map_triggers(struct ath_softc *sc,
-                                  struct cfg80211_wowlan *wowlan,
-                                  u32 *wow_triggers)
+static u8 ath9k_wow_map_triggers(struct ath_softc *sc,
+                                struct cfg80211_wowlan *wowlan)
 {
+       u8 wow_triggers = 0;
+
        if (wowlan->disconnect)
-               *wow_triggers |= AH_WOW_LINK_CHANGE |
-                                AH_WOW_BEACON_MISS;
+               wow_triggers |= AH_WOW_LINK_CHANGE |
+                               AH_WOW_BEACON_MISS;
        if (wowlan->magic_pkt)
-               *wow_triggers |= AH_WOW_MAGIC_PATTERN_EN;
+               wow_triggers |= AH_WOW_MAGIC_PATTERN_EN;
 
        if (wowlan->n_patterns)
-               *wow_triggers |= AH_WOW_USER_PATTERN_EN;
-
-       sc->wow_enabled = *wow_triggers;
+               wow_triggers |= AH_WOW_USER_PATTERN_EN;
 
+       return wow_triggers;
 }
 
 static void ath9k_wow_add_disassoc_deauth_pattern(struct ath_softc *sc)
@@ -45,7 +45,7 @@ static void ath9k_wow_add_disassoc_deauth_pattern(struct ath_softc *sc)
        struct ath_hw *ah = sc->sc_ah;
        struct ath_common *common = ath9k_hw_common(ah);
        int pattern_count = 0;
-       int i, byte_cnt;
+       int i, byte_cnt = 0;
        u8 dis_deauth_pattern[MAX_PATTERN_SIZE];
        u8 dis_deauth_mask[MAX_PATTERN_SIZE];
 
@@ -80,12 +80,7 @@ static void ath9k_wow_add_disassoc_deauth_pattern(struct ath_softc *sc)
         *                          | x:x:x:x:x:x  -- 22 bytes
         */
 
-       /* Create Disassociate Pattern first */
-
-       byte_cnt = 0;
-
        /* Fill out the mask with all FF's */
-
        for (i = 0; i < MAX_PATTERN_MASK_SIZE; i++)
                dis_deauth_mask[i] = 0xff;
 
@@ -108,17 +103,13 @@ static void ath9k_wow_add_disassoc_deauth_pattern(struct ath_softc *sc)
        byte_cnt += 6;
 
        /* copy the bssid, its same as the source mac address */
-
        memcpy((dis_deauth_pattern + byte_cnt), common->curbssid, ETH_ALEN);
 
        /* Create Disassociate pattern mask */
-
        dis_deauth_mask[0] = 0xfe;
        dis_deauth_mask[1] = 0x03;
        dis_deauth_mask[2] = 0xc0;
 
-       ath_dbg(common, WOW, "Adding disassoc/deauth patterns for WoW\n");
-
        ath9k_hw_wow_apply_pattern(ah, dis_deauth_pattern, dis_deauth_mask,
                                   pattern_count, byte_cnt);
 
@@ -131,7 +122,6 @@ static void ath9k_wow_add_disassoc_deauth_pattern(struct ath_softc *sc)
 
        ath9k_hw_wow_apply_pattern(ah, dis_deauth_pattern, dis_deauth_mask,
                                   pattern_count, byte_cnt);
-
 }
 
 static void ath9k_wow_add_pattern(struct ath_softc *sc,
@@ -190,7 +180,7 @@ int ath9k_suspend(struct ieee80211_hw *hw,
        struct ath_softc *sc = hw->priv;
        struct ath_hw *ah = sc->sc_ah;
        struct ath_common *common = ath9k_hw_common(ah);
-       u32 wow_triggers_enabled = 0;
+       u8 triggers;
        int ret = 0;
 
        ath9k_deinit_channel_context(sc);
@@ -230,14 +220,16 @@ int ath9k_suspend(struct ieee80211_hw *hw,
                goto fail_wow;
        }
 
+       triggers = ath9k_wow_map_triggers(sc, wowlan);
+       if (!triggers) {
+               ath_dbg(common, WOW, "No valid WoW triggers\n");
+               ret = 1;
+               goto fail_wow;
+       }
+
        ath_cancel_work(sc);
        ath_stop_ani(sc);
 
-       ath9k_wow_map_triggers(sc, wowlan, &wow_triggers_enabled);
-
-       ath_dbg(common, WOW, "WoW triggers enabled 0x%x\n",
-               wow_triggers_enabled);
-
        ath9k_ps_wakeup(sc);
 
        ath9k_stop_btcoex(sc);
@@ -248,7 +240,7 @@ int ath9k_suspend(struct ieee80211_hw *hw,
         */
        ath9k_wow_add_disassoc_deauth_pattern(sc);
 
-       if (wow_triggers_enabled & AH_WOW_USER_PATTERN_EN)
+       if (triggers & AH_WOW_USER_PATTERN_EN)
                ath9k_wow_add_pattern(sc, wowlan);
 
        spin_lock_bh(&sc->sc_pcu_lock);
@@ -273,12 +265,13 @@ int ath9k_suspend(struct ieee80211_hw *hw,
        synchronize_irq(sc->irq);
        tasklet_kill(&sc->intr_tq);
 
-       ath9k_hw_wow_enable(ah, wow_triggers_enabled);
+       ath9k_hw_wow_enable(ah, triggers);
 
        ath9k_ps_restore(sc);
-       ath_dbg(common, ANY, "WoW enabled in ath9k\n");
+       ath_dbg(common, WOW, "Suspend with WoW triggers: 0x%x\n", triggers);
        atomic_inc(&sc->wow_sleep_proc_intr);
 
+       set_bit(ATH_OP_WOW_ENABLED, &common->op_flags);
 fail_wow:
        mutex_unlock(&sc->mutex);
        return ret;
@@ -327,6 +320,8 @@ int ath9k_resume(struct ieee80211_hw *hw)
        ath_restart_work(sc);
        ath9k_start_btcoex(sc);
 
+       clear_bit(ATH_OP_WOW_ENABLED, &common->op_flags);
+
        ath9k_ps_restore(sc);
        mutex_unlock(&sc->mutex);