rtw88: fix idle mode flow for hw scan

Upon hw scan completion, idle mode is not re-entered. This might
increase power consumption under no link mode. Fix this by adding the
re-enter flow. We need another work for this since enter_ips waits
for c2h_work to finish, which might lead to deadlock if caller is in
the same work.

Fixes: 10d162b2ed39 ("rtw88: 8822c: add ieee80211_ops::hw_scan")
Signed-off-by: Po-Hao Huang <phhuang@realtek.com>
Signed-off-by: Ping-Ke Shih <pkshih@realtek.com>
Signed-off-by: Kalle Valo <kvalo@kernel.org>
Link: https://lore.kernel.org/r/20220121070813.9656-3-pkshih@realtek.com

diff --git a/drivers/net/wireless/realtek/rtw88/fw.c b/drivers/net/wireless/realtek/rtw88/fw.c
index b56dc43..a631042 100644 (file)
--- a/drivers/net/wireless/realtek/rtw88/fw.c
+++ b/drivers/net/wireless/realtek/rtw88/fw.c
@@ -2030,7 +2030,7 @@ void rtw_hw_scan_complete(struct rtw_dev *rtwdev, struct ieee80211_vif *vif,
        rtwdev->hal.rcr |= BIT_CBSSID_BCN;
        rtw_write32(rtwdev, REG_RCR, rtwdev->hal.rcr);
 
-       rtw_core_scan_complete(rtwdev, vif);
+       rtw_core_scan_complete(rtwdev, vif, true);
 
        ieee80211_wake_queues(rtwdev->hw);
        ieee80211_scan_completed(rtwdev->hw, &info);

diff --git a/drivers/net/wireless/realtek/rtw88/mac80211.c b/drivers/net/wireless/realtek/rtw88/mac80211.c
index ae7d97d..647d266 100644 (file)
--- a/drivers/net/wireless/realtek/rtw88/mac80211.c
+++ b/drivers/net/wireless/realtek/rtw88/mac80211.c
@@ -72,6 +72,9 @@ static int rtw_ops_config(struct ieee80211_hw *hw, u32 changed)
        struct rtw_dev *rtwdev = hw->priv;
        int ret = 0;
 
+       /* let previous ips work finish to ensure we don't leave ips twice */
+       cancel_work_sync(&rtwdev->ips_work);
+
        mutex_lock(&rtwdev->mutex);
 
        rtw_leave_lps_deep(rtwdev);
@@ -614,7 +617,7 @@ static void rtw_ops_sw_scan_complete(struct ieee80211_hw *hw,
        struct rtw_dev *rtwdev = hw->priv;
 
        mutex_lock(&rtwdev->mutex);
-       rtw_core_scan_complete(rtwdev, vif);
+       rtw_core_scan_complete(rtwdev, vif, false);
        mutex_unlock(&rtwdev->mutex);
 }
 

diff --git a/drivers/net/wireless/realtek/rtw88/main.c b/drivers/net/wireless/realtek/rtw88/main.c
index 3825211..39c223a 100644 (file)
--- a/drivers/net/wireless/realtek/rtw88/main.c
+++ b/drivers/net/wireless/realtek/rtw88/main.c
@@ -272,6 +272,15 @@ static void rtw_c2h_work(struct work_struct *work)
        }
 }
 
+static void rtw_ips_work(struct work_struct *work)
+{
+       struct rtw_dev *rtwdev = container_of(work, struct rtw_dev, ips_work);
+
+       mutex_lock(&rtwdev->mutex);
+       rtw_enter_ips(rtwdev);
+       mutex_unlock(&rtwdev->mutex);
+}
+
 static u8 rtw_acquire_macid(struct rtw_dev *rtwdev)
 {
        unsigned long mac_id;
@@ -1339,7 +1348,8 @@ void rtw_core_scan_start(struct rtw_dev *rtwdev, struct rtw_vif *rtwvif,
        set_bit(RTW_FLAG_SCANNING, rtwdev->flags);
 }
 
-void rtw_core_scan_complete(struct rtw_dev *rtwdev, struct ieee80211_vif *vif)
+void rtw_core_scan_complete(struct rtw_dev *rtwdev, struct ieee80211_vif *vif,
+                           bool hw_scan)
 {
        struct rtw_vif *rtwvif = (struct rtw_vif *)vif->drv_priv;
        u32 config = 0;
@@ -1354,6 +1364,9 @@ void rtw_core_scan_complete(struct rtw_dev *rtwdev, struct ieee80211_vif *vif)
        rtw_vif_port_config(rtwdev, rtwvif, config);
 
        rtw_coex_scan_notify(rtwdev, COEX_SCAN_FINISH);
+
+       if (rtwvif->net_type == RTW_NET_NO_LINK && hw_scan)
+               ieee80211_queue_work(rtwdev->hw, &rtwdev->ips_work);
 }
 
 int rtw_core_start(struct rtw_dev *rtwdev)
@@ -1919,6 +1932,7 @@ int rtw_core_init(struct rtw_dev *rtwdev)
        INIT_DELAYED_WORK(&coex->wl_ccklock_work, rtw_coex_wl_ccklock_work);
        INIT_WORK(&rtwdev->tx_work, rtw_tx_work);
        INIT_WORK(&rtwdev->c2h_work, rtw_c2h_work);
+       INIT_WORK(&rtwdev->ips_work, rtw_ips_work);
        INIT_WORK(&rtwdev->fw_recovery_work, rtw_fw_recovery_work);
        INIT_WORK(&rtwdev->ba_work, rtw_txq_ba_work);
        skb_queue_head_init(&rtwdev->c2h_queue);

diff --git a/drivers/net/wireless/realtek/rtw88/main.h b/drivers/net/wireless/realtek/rtw88/main.h
index dc1cd9b..36e1e40 100644 (file)
--- a/drivers/net/wireless/realtek/rtw88/main.h
+++ b/drivers/net/wireless/realtek/rtw88/main.h
@@ -1960,6 +1960,7 @@ struct rtw_dev {
        /* c2h cmd queue & handler work */
        struct sk_buff_head c2h_queue;
        struct work_struct c2h_work;
+       struct work_struct ips_work;
        struct work_struct fw_recovery_work;
 
        /* used to protect txqs list */
@@ -2101,7 +2102,8 @@ void rtw_tx_report_purge_timer(struct timer_list *t);
 void rtw_update_sta_info(struct rtw_dev *rtwdev, struct rtw_sta_info *si);
 void rtw_core_scan_start(struct rtw_dev *rtwdev, struct rtw_vif *rtwvif,
                         const u8 *mac_addr, bool hw_scan);
-void rtw_core_scan_complete(struct rtw_dev *rtwdev, struct ieee80211_vif *vif);
+void rtw_core_scan_complete(struct rtw_dev *rtwdev, struct ieee80211_vif *vif,
+                           bool hw_scan);
 int rtw_core_start(struct rtw_dev *rtwdev);
 void rtw_core_stop(struct rtw_dev *rtwdev);
 int rtw_chip_info_setup(struct rtw_dev *rtwdev);