Thanks for the investigation!

As discussed offline, I will send v2 with Fixes: removed, and Bryan will test and submit a separate patch to add the additional feat_caps for the power_save off case.

Depending on DB410c testing, these feat_caps may need to be gated for WCN3680 only, in which case Loic's patch to re-enable CONNECTION_MONITOR (but gated for WCN3660/3620) would still be needed.

Ben

On 9/1/21 4:56 AM, Bryan O'Donoghue wrote:

On 01/09/2021 07:40, Loic Poulain wrote:

...

iw wlan0 set power_save off

I do this on wcn3680b and get no loss of signal

If I do this though

diff --git a/drivers/net/wireless/ath/wcn36xx/smd.c b/drivers/net/wireless/ath/wcn36xx/smd.c index 03966072f34c..ba613fbb728d 100644 --- a/drivers/net/wireless/ath/wcn36xx/smd.c +++ b/drivers/net/wireless/ath/wcn36xx/smd.c @@ -2345,6 +2345,8 @@ int wcn36xx_smd_feature_caps_exchange(struct wcn36xx *wcn)                 set_feat_caps(msg_body.feat_caps, DOT11AC);                 set_feat_caps(msg_body.feat_caps, ANTENNA_DIVERSITY_SELECTION);         } +       set_feat_caps(msg_body.feat_caps, IBSS_HEARTBEAT_OFFLOAD); +       set_feat_caps(msg_body.feat_caps, WLANACTIVE_OFFLOAD);

PREPARE_HAL_BUF(wcn->hal_buf, msg_body);

@@ -2589,7 +2591,7 @@ static int wcn36xx_smd_missed_beacon_ind(struct wcn36xx *wcn,         struct wcn36xx_hal_missed_beacon_ind_msg *rsp = buf;         struct ieee80211_vif *vif = NULL;         struct wcn36xx_vif *tmp;

+wcn36xx_info("%s/%d\n", __func__, __LINE__);         /* Old FW does not have bss index */         if (wcn36xx_is_fw_version(wcn, 1, 2, 2, 24)) {                 list_for_each_entry(tmp, &wcn->vif_list, list) { @@ -2608,7 +2610,7 @@ static int wcn36xx_smd_missed_beacon_ind(struct wcn36xx *wcn,

list_for_each_entry(tmp, &wcn->vif_list, list) {                 if (tmp->bss_index == rsp->bss_index) { -                       wcn36xx_dbg(WCN36XX_DBG_HAL, "beacon missed bss_index %d\n", +                       wcn36xx_info("beacon missed bss_index %d\n",                                     rsp->bss_index);                         vif = wcn36xx_priv_to_vif(tmp);                         ieee80211_connection_loss(vif);

bingo

root@linaro-developer:~# iw wlan0 set power_save off

# pulls plug on AP

root@linaro-developer:~# [   83.290987] wcn36xx: wcn36xx_smd_missed_beacon_ind/2594 [   83.291070] wcn36xx: beacon missed bss_index 0 [   83.295403] wlan0: Connection to AP e2:63:da:9c:a4:bd lost

I'm not sure if both flags are required but, this is the behavior we want