Manikanta Pubbisetty <quic_mpubbise@xxxxxxxxxxx> wrote: > Currently, time taken to scan all supported channels on WCN6750 > is ~8 seconds and connection time is almost 10 seconds. WCN6750 > supports three Wi-Fi bands (i.e., 2.4/5/6 GHz) and the numbers of > channels for scan come around ~100 channels (default case). > Since the chip doesn't have support for DBS (Dual Band Simultaneous), > scans cannot be parallelized resulting in longer scan times. > > Among the 100 odd channels, ~60 channels are in 6 GHz band. Therefore, > optimizing the scan for 6 GHz channels will bring down the overall > scan time. > > WCN6750 firmware has support to scan a 6 GHz channel based on co-located > AP information i.e., RNR IE which is found in the legacy 2.4/5 GHz scan > results. When a scan request with all supported channel list is enqueued > to the firmware, then based on WMI_SCAN_CHAN_FLAG_SCAN_ONLY_IF_RNR_FOUND > scan channel flag, firmware will scan only those 6 GHz channels for which > RNR IEs are found in the legacy scan results. > > In the proposed design, based on NL80211_SCAN_FLAG_COLOCATED_6GHZ scan > flag, driver will set the WMI_SCAN_CHAN_FLAG_SCAN_ONLY_IF_RNR_FOUND flag > for non-PSC channels. Since there is high probability to find 6 GHz APs > on PSC channels, these channels are always scanned. Only non-PSC channels > are selectively scanned based on cached RNR information from the legacy > scan results. > > If NL80211_SCAN_FLAG_COLOCATED_6GHZ is not set in the scan flags, > then scan will happen on all supported channels (default behavior). > > With these optimizations, scan time is improved by 1.5-1.8 seconds on > WCN6750. Similar savings have been observed on WCN6855. > > Tested-on: WCN6750 hw1.0 AHB WLAN.MSL.1.0.1-00887-QCAMSLSWPLZ-1 > Tested-on: WCN6855 hw2.1 PCI WLAN.HSP.1.1-03125-QCAHSPSWPL_V1_V2_SILICONZ_LITE-3.6510.16 > > Signed-off-by: Manikanta Pubbisetty <quic_mpubbise@xxxxxxxxxxx> > Signed-off-by: Kalle Valo <quic_kvalo@xxxxxxxxxxx> Patch applied to ath-next branch of ath.git, thanks. 8b4d2f080afb wifi: ath11k: Optimize 6 GHz scan time -- https://patchwork.kernel.org/project/linux-wireless/patch/20230323060913.10097-1-quic_mpubbise@xxxxxxxxxxx/ https://wireless.wiki.kernel.org/en/developers/documentation/submittingpatches
