wifi: ath12k: Improve BSS discovery with hidden SSID in 6 GHz band

[ Upstream commit 27d38bdfd416f4db70e09c3bef3b030c86fd235a ]

Currently, sometimes, the station is unable to identify the configured
AP SSID in its scan results when the AP is not broadcasting its name
publicly and has a hidden SSID.

Currently, channel dwell time for an ath12k station is 30 ms. Sometimes,
station can send broadcast probe request to AP close to the end of dwell
time. In some of these cases, before AP sends a response to the received
probe request, the dwell time on the station side would come to an end.
So, the station will move to scan next channel and will not be able to
acknowledge the unicast probe response.

Resolve this issue by increasing station's channel dwell time to 70 ms,
so that the it remains on the same channel for a longer period. This
would increase the station's chance of receiving probe response from the
AP. The station will then send a response acknowledgment back to the AP,
thus leading to successful scan and BSS discovery.

With an increased dwell time, scan would take longer than it takes now.
But, this fix is an improvement for hidden SSID scan issue.

Tested-on: QCN9274 hw2.0 PCI WLAN.WBE.1.4.1-00199-QCAHKSWPL_SILICONZ-1

Signed-off-by: Ramasamy Kaliappan <quic_rkaliapp@quicinc.com>
Signed-off-by: Roopni Devanathan <quic_rdevanat@quicinc.com>
Reviewed-by: Vasanthakumar Thiagarajan <vasanthakumar.thiagarajan@oss.qualcomm.com>
Link: https://patch.msgid.link/20250207060005.153835-1-quic_rdevanat@quicinc.com
Signed-off-by: Jeff Johnson <jeff.johnson@oss.qualcomm.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/drivers/net/wireless/ath/ath12k/wmi.c b/drivers/net/wireless/ath/ath12k/wmi.c
index 7a87777e0a047dee5c6d1afe1177fc331124c7dd..9cd7ceae5a4f88905291c222aa6df000b331303d 100644 (file)
--- a/drivers/net/wireless/ath/ath12k/wmi.c
+++ b/drivers/net/wireless/ath/ath12k/wmi.c
@@ -2373,8 +2373,8 @@ void ath12k_wmi_start_scan_init(struct ath12k *ar,
        arg->dwell_time_active = 50;
        arg->dwell_time_active_2g = 0;
        arg->dwell_time_passive = 150;
-       arg->dwell_time_active_6g = 40;
-       arg->dwell_time_passive_6g = 30;
+       arg->dwell_time_active_6g = 70;
+       arg->dwell_time_passive_6g = 70;
        arg->min_rest_time = 50;
        arg->max_rest_time = 500;
        arg->repeat_probe_time = 0;