mac80211/rtl: backport a rtl8192cu AP mode fix

Running USB devices in AP mode is never a good idea. That said, fix the TIM
issue in rtl8192cu [1], allowing these devices to "work" in AP mode.

[1] https://patchwork.kernel.org/project/linux-wireless/patch/20210419065956.6085-1-pkshih@realtek.com/

Signed-off-by: Rui Salvaterra <rsalvaterra@gmail.com>
(cherry picked from commit eeda8652f1655d4f9c11e9c9f51ddcd3377d119a)

diff --git a/package/kernel/mac80211/patches/rtl/002-v5.13-rtlwifi-implement-set_tim-by-update-beacon-content.patch b/package/kernel/mac80211/patches/rtl/002-v5.13-rtlwifi-implement-set_tim-by-update-beacon-content.patch
new file mode 100644 (file)
index 0000000..3daf65e
--- /dev/null
+++ b/package/kernel/mac80211/patches/rtl/002-v5.13-rtlwifi-implement-set_tim-by-update-beacon-content.patch
@@ -0,0 +1,118 @@
+Date: Mon, 19 Apr 2021 14:59:56 +0800
+From: Ping-Ke Shih <pkshih@realtek.com>
+To: <kvalo@codeaurora.org>
+CC: <linux-wireless@vger.kernel.org>, <mail@maciej.szmigiero.name>,
+        <Larry.Finger@lwfinger.net>
+Subject: [PATCH] rtlwifi: implement set_tim by update beacon content
+
+Once beacon content is changed, we update the content to wifi card by
+send_beacon_frame(). Then, STA with PS can wake up properly to receive its
+packets.
+
+Since we update beacon content to PCI wifi devices every beacon interval,
+the only one usb device, 8192CU, needs to update beacon content when
+mac80211 calling set_tim.
+
+Reported-by: Maciej S. Szmigiero <mail@maciej.szmigiero.name>
+Signed-off-by: Ping-Ke Shih <pkshih@realtek.com>
+Tested-by: Maciej S. Szmigiero <mail@maciej.szmigiero.name>
+---
+ drivers/net/wireless/realtek/rtlwifi/core.c | 32 +++++++++++++++++++++
+ drivers/net/wireless/realtek/rtlwifi/core.h |  1 +
+ drivers/net/wireless/realtek/rtlwifi/usb.c  |  3 ++
+ drivers/net/wireless/realtek/rtlwifi/wifi.h |  1 +
+ 4 files changed, 37 insertions(+)
+
+--- a/drivers/net/wireless/realtek/rtlwifi/core.c
++++ b/drivers/net/wireless/realtek/rtlwifi/core.c
+@@ -1018,6 +1018,25 @@ static void send_beacon_frame(struct iee
+       }
+ }
+ 
++void rtl_update_beacon_work_callback(struct work_struct *work)
++{
++      struct rtl_works *rtlworks =
++          container_of(work, struct rtl_works, update_beacon_work);
++      struct ieee80211_hw *hw = rtlworks->hw;
++      struct rtl_priv *rtlpriv = rtl_priv(hw);
++      struct ieee80211_vif *vif = rtlpriv->mac80211.vif;
++
++      if (!vif) {
++              WARN_ONCE(true, "no vif to update beacon\n");
++              return;
++      }
++
++      mutex_lock(&rtlpriv->locks.conf_mutex);
++      send_beacon_frame(hw, vif);
++      mutex_unlock(&rtlpriv->locks.conf_mutex);
++}
++EXPORT_SYMBOL_GPL(rtl_update_beacon_work_callback);
++
+ static void rtl_op_bss_info_changed(struct ieee80211_hw *hw,
+                                   struct ieee80211_vif *vif,
+                                   struct ieee80211_bss_conf *bss_conf,
+@@ -1747,6 +1766,18 @@ static void rtl_op_flush(struct ieee8021
+               rtlpriv->intf_ops->flush(hw, queues, drop);
+ }
+ 
++static int rtl_op_set_tim(struct ieee80211_hw *hw, struct ieee80211_sta *sta,
++                        bool set)
++{
++      struct rtl_priv *rtlpriv = rtl_priv(hw);
++      struct rtl_hal *rtlhal = rtl_hal(rtl_priv(hw));
++
++      if (rtlhal->hw_type == HARDWARE_TYPE_RTL8192CU)
++              schedule_work(&rtlpriv->works.update_beacon_work);
++
++      return 0;
++}
++
+ /*    Description:
+  *            This routine deals with the Power Configuration CMD
+  *             parsing for RTL8723/RTL8188E Series IC.
+@@ -1903,6 +1934,7 @@ const struct ieee80211_ops rtl_ops = {
+       .sta_add = rtl_op_sta_add,
+       .sta_remove = rtl_op_sta_remove,
+       .flush = rtl_op_flush,
++      .set_tim = rtl_op_set_tim,
+ };
+ EXPORT_SYMBOL_GPL(rtl_ops);
+ 
+--- a/drivers/net/wireless/realtek/rtlwifi/core.h
++++ b/drivers/net/wireless/realtek/rtlwifi/core.h
+@@ -60,5 +60,6 @@ void rtl_bb_delay(struct ieee80211_hw *h
+ bool rtl_cmd_send_packet(struct ieee80211_hw *hw, struct sk_buff *skb);
+ bool rtl_btc_status_false(void);
+ void rtl_dm_diginit(struct ieee80211_hw *hw, u32 cur_igval);
++void rtl_update_beacon_work_callback(struct work_struct *work);
+ 
+ #endif
+--- a/drivers/net/wireless/realtek/rtlwifi/usb.c
++++ b/drivers/net/wireless/realtek/rtlwifi/usb.c
+@@ -807,6 +807,7 @@ static void rtl_usb_stop(struct ieee8021
+ 
+       tasklet_kill(&rtlusb->rx_work_tasklet);
+       cancel_work_sync(&rtlpriv->works.lps_change_work);
++      cancel_work_sync(&rtlpriv->works.update_beacon_work);
+ 
+       flush_workqueue(rtlpriv->works.rtl_wq);
+ 
+@@ -1033,6 +1034,8 @@ int rtl_usb_probe(struct usb_interface *
+                 rtl_fill_h2c_cmd_work_callback);
+       INIT_WORK(&rtlpriv->works.lps_change_work,
+                 rtl_lps_change_work_callback);
++      INIT_WORK(&rtlpriv->works.update_beacon_work,
++                rtl_update_beacon_work_callback);
+ 
+       rtlpriv->usb_data_index = 0;
+       init_completion(&rtlpriv->firmware_loading_complete);
+--- a/drivers/net/wireless/realtek/rtlwifi/wifi.h
++++ b/drivers/net/wireless/realtek/rtlwifi/wifi.h
+@@ -2487,6 +2487,7 @@ struct rtl_works {
+ 
+       struct work_struct lps_change_work;
+       struct work_struct fill_h2c_cmd;
++      struct work_struct update_beacon_work;
+ };
+ 
+ struct rtl_debug {