SM8750: fix wcn7860 crash on passive multi-band Wi-Fi scan - #3171
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Device patch 0615: in ath12k_mac_initiate_hw_scan(), skip WMI_SCAN_FLAG_PASSIVE when a scan with no SSIDs spans 2.4 GHz and 5/6 GHz. Per-channel passive and DFS flags from WMI_SCAN_CHAN_LIST still apply, so channels that may not be probed still are not probed. - keyed to hw_rev ATH12K_HW_WCN7860_HW20 - iwd's periodic scan sends no SSIDs, so this fired every 30 s
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Adds 0616. The wcn7860 firmware stops handing up management frames once a scan request carries too many channels, so APs in range never reach the results. Against a -47 dBm AP at the same 54 ms dwell: 8 channels gave 60 frames and found it, 20 gave 24 and did not. ath12k_mac_scan_start_chunk() issues 8 channels per WMI scan and ath12k_scan_vdev_clean_work() chains the next chunk instead of reporting completion. Full-channel scans find the AP 7/8, was 0/8.
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Summary
fully passive wifi scans across 2.4ghz + 5/6ghz bands, like the iwd scan running every 30s, crash the wcn7860 firmware, stop doing that (stop crashing, not stop scanning).
also, a scan request carrying too many channels may return an incomplete list of APs, fixed by chunking scan requests.
Testing
tested on the konkr pocket fit elite.
iwd runs a no-probe scan every 30s, which ath12k maps to a fully passive scan. this crashes the wcn7860 firmware. with this change, ath12k does not add the fully_passive flag to no-probe scans if the scan spans multiple bands, fixing the crash.
the channel scan results previously failed to find certain access points, now all APs in range are found.
Additional Context
i dont know why the firmware crashes with a fully passive scan across multiple bands. fully passive on a single band is fine, active across single or multiple is also fine.
also, once again I dont know which devices to constrain this to, similar to #3170
wcn7860 firmware version on my device is WLAN.GNG.1.0-04065-QCAGNGSWPL_V1.0_V2.0_SILICONZ-1
AI Usage
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