[PATCH ath-next] wifi: ath12k: bring DFS support back for WCN7850

[Jeff Johnson]

On 7/20/2025 7:27 PM, Baochen Qiang wrote:
> Due to the restrict in MAC80211 that DFS (Dynamic Frequency Selection)
> can't be enabled on multiple channels, commit 176f3009ae59 ("wifi: ath12k:
> support 2 channels for single pdev device") removes DFS support in order
> to support 2 channels concurrently, making AP mode not working on DFS
> channels [1].
> 
> Revert portions of that commit to bring DFS back, and add a new
> combination to support 2-channels concurrency. This is valid because the
> MAC80211 restrict works on each individual combination, but does not care
> about them as a whole, as far as DFS is concerned.
> 
> This change applies to WCN7850 only, other chips are not affected.
> 
> Tested-on: WCN7850 hw2.0 PCI WLAN.HMT.1.1.c5-00284.1-QCAHMTSWPL_V1.0_V2.0_SILICONZ-3
> 
> Fixes: 176f3009ae59 ("wifi: ath12k: support 2 channels for single pdev device")
> Reported-by: Mihai Moldovan <ionic at ionic.de>
> Closes: https://bugzilla.kernel.org/show_bug.cgi?id=220346 # 1
> Signed-off-by: Baochen Qiang <baochen.qiang at oss.qualcomm.com>
> ---

I'll update this to capture the following from Bugzilla:

--- Comment #3 from Mihai Moldovan (ionic at ionic.de) ---
Yeah, adding a second combination with DFS support seems to work fine.


Tested-by: Mihai Moldovan <ionic at ionic.de>

(WLAN.HMT.1.1.c5-00284.1-QCAHMTSWPL_V1.0_V2.0_SILICONZ-3)