1:  9be09f472643 = 1:  65e3b604f9cb wifi: rtw88: download the beacon the reserved page was built with
2:  c2737d79f34f ! 2:  98a6efdf30e1 wifi: rtw88: support channel switch in AP mode
    @@ drivers/net/wireless/realtek/rtw88/main.c: void rtw_core_stop(struct rtw_dev *rt
      	cancel_delayed_work_sync(&rtwdev->watch_dog_work);
      	cancel_delayed_work_sync(&coex->bt_relink_work);
      	cancel_delayed_work_sync(&coex->bt_reenable_work);
    +@@ drivers/net/wireless/realtek/rtw88/main.c: void rtw_core_stop(struct rtw_dev *rtwdev)
    + 
    + 	mutex_lock(&rtwdev->mutex);
    + 
    ++	rtwdev->csa_vif = NULL;
    ++	cancel_delayed_work(&rtwdev->csa_beacon_work);
    ++
    + 	rtwdev->chip->ops->power_off(rtwdev);
    + }
    + 
     @@ drivers/net/wireless/realtek/rtw88/main.c: int rtw_core_init(struct rtw_dev *rtwdev)
      	INIT_WORK(&rtwdev->ips_work, rtw_ips_work);
      	INIT_WORK(&rtwdev->fw_recovery_work, rtw_fw_recovery_work);
3:  efb8335e4df9 ! 3:  afa71da8e515 wifi: rtw88: time the countdown downloads from the TBTT
    @@ Commit message
         the next at once. A TSF jump, an IBSS merge or a reset, restarts the
         schedule from the next TBTT.
     
    -    A TBTT just before the start may already have sent the first count; it
    -    is taken as the one that did, so no count is sent twice.
    +    The first count is downloaded the same way, not when mac80211 changes
    +    the beacon: a download close to a TBTT keeps beacons off the air. On an
    +    RTL8821CU and an RTL8822CU a TBTT during the download sent no beacon or
    +    the old one. On an RTL8822CE a TBTT up to about 100 us before the
    +    download sent none and the next beacon stayed out too, and with a count
    +    of 2 no CSA beacon went out. The switch completes up to one beacon
    +    interval later. The replay after a hardware restart still downloads at
    +    once.
     
         The USB chips raise no TBTT interrupt, so the TSF register is read. The
         beaconing interface is always on port 0: rtw_core_port_switch() moves
         an AP there, an IBSS runs alone.
     
         Signed-off-by: Mehmet Fide <mehmet.fide@screeningeagle.com>
    -    Acked-by: Ping-Ke Shih <pkshih@realtek.com>
    -    Reviewed-by: Luka Gejak <luka.gejak@linux.dev>
     
      ## drivers/net/wireless/realtek/rtw88/fw.c ##
     @@
    @@ drivers/net/wireless/realtek/rtw88/fw.c: bool rtw_fw_csa_active(struct rtw_dev *
     +	if (start) {
     +		div_u64_rem(tsf, interval, &rem);
     +		rtwdev->csa_tbtt = tsf - rem + interval;
    -+		/* a TBTT just passed may have sent the first count */
    -+		if (rem < RTW_CSA_TBTT_MARGIN_US)
    -+			rtwdev->csa_tbtt -= interval;
     +	} else {
     +		rtwdev->csa_tbtt += interval;
     +	}
    @@ drivers/net/wireless/realtek/rtw88/fw.c: void rtw_fw_csa_beacon_work(struct work
      		ieee80211_csa_finish(vif, 0);
      	}
     
    + ## drivers/net/wireless/realtek/rtw88/mac80211.c ##
    +@@ drivers/net/wireless/realtek/rtw88/mac80211.c: static void rtw_ops_bss_info_changed(struct ieee80211_hw *hw,
    + 
    + 	if (changed & BSS_CHANGED_BEACON) {
    + 		rtw_set_dtim_period(rtwdev, conf->dtim_period);
    +-		rtw_fw_download_rsvd_page(rtwdev);
    +-		rtw_send_rsvd_page_h2c(rtwdev);
    ++		/* the countdown downloads its beacons after a TBTT */
    ++		if (!conf->csa_active || changed & BSS_CHANGED_BEACON_ENABLED) {
    ++			rtw_fw_download_rsvd_page(rtwdev);
    ++			rtw_send_rsvd_page_h2c(rtwdev);
    ++		}
    + 		/* restart replay resumes it, a beacon without CSA ends it */
    + 		if (conf->csa_active)
    + 			rtw_fw_csa_start(rtwdev, vif);
    +
      ## drivers/net/wireless/realtek/rtw88/main.h ##
     @@ drivers/net/wireless/realtek/rtw88/main.h: struct rtw_dev {
      	struct work_struct update_beacon_work;