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

[Vasanthakumar Thiagarajan]

On 2/7/2025 11:30 AM, Roopni Devanathan wrote:
> From: Ramasamy Kaliappan <quic_rkaliapp at quicinc.com>
> 
> 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 at quicinc.com>
> Signed-off-by: Roopni Devanathan <quic_rdevanat at quicinc.com>

Reviewed-by: Vasanthakumar Thiagarajan <vasanthakumar.thiagarajan at oss.qualcomm.com>