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

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Message-ID: <da13cb46-8680-46ac-8bc2-3513be43a492@oss.qualcomm.com>
Date: Mon, 21 Jul 2025 07:09:13 -0700
From: Jeff Johnson <jeff.johnson@....qualcomm.com>
To: Baochen Qiang <baochen.qiang@....qualcomm.com>,
        Jeff Johnson <jjohnson@...nel.org>,
        Baochen Qiang <quic_bqiang@...cinc.com>
Cc: linux-wireless@...r.kernel.org, ath12k@...ts.infradead.org,
        linux-kernel@...r.kernel.org, Mihai Moldovan <ionic@...ic.de>
Subject: Re: [PATCH ath-next] wifi: ath12k: bring DFS support back for WCN7850

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@...ic.de>
> Closes: https://bugzilla.kernel.org/show_bug.cgi?id=220346 # 1
> Signed-off-by: Baochen Qiang <baochen.qiang@....qualcomm.com>
> ---

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

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


Tested-by: Mihai Moldovan <ionic@...ic.de>

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