Re: [PATCH ath-current] wifi: ath12k: fix frequency range for single-pdev devices

[Shenghan Gao]

The update sequence is as follows.

ath12k_regd_update() first resets ar->freq_range to zero. On the
tested WCN7850 under the CN regulatory domain, the 2 GHz branch
calculates a valid range, so the first call to
ath12k_mac_update_freq_range() sets ar->freq_range to 2402-2482 MHz.

The existing 5 GHz branch is skipped because ar->supports_6ghz is true.

When the new regulatory domain is built, reg_freq_6ghz.end_freq is
reset to zero. Since the CN regulatory event contains no 6 GHz rules,
it remains zero. The 6 GHz branch therefore calculates freq_high as
zero, and ath12k_mac_update_freq_range() returns without extending the
existing range.

Consequently, ar->freq_range remains 2402-2482 MHz, and the subsequent
channel-list update filters out all 5 GHz channels.

With this patch, the 5 GHz branch also runs for single-pdev devices and
merges the valid 5 GHz range, extending ar->freq_range to
2402-5835 MHz.

Baochen Qiang <baochen.qiang@xxxxxxxxxxxxxxxx> 于2026年7月20日周一 16:34写道：
>
>
>
> On 7/15/2026 2:52 PM, Shenghan Gao wrote:
> > Commit 0d777aa2ca77 ("wifi: ath12k: fix mac pdev frequency range update")
> > made ath12k_regd_update() handle each supported band independently.
> > However, it uses WMI band capability values as indices into
> > pdev->cap.band[]. Those values are bit flags, while cap.band[] is indexed
> > by enum nl80211_band. As a result, the 2.4 GHz lookup reads the
> > 5 GHz entry, while the 5 GHz lookup reads the 60 GHz entry.
> >
> > Also, the 5 GHz range is skipped whenever the radio supports 6 GHz. This
> > is valid when 5 and 6 GHz belong to separate pdevs, but not for single-pdev
> > devices such as WCN7850, where the same pdev covers both bands. After a
> > regulatory update, 5 GHz is therefore omitted from ar->freq_range and later
> > filtered out of the channel list sent to firmware.
> >
> > On the tested WCN7850, the 11d regulatory update left the frequency range
> > at 2402-2482 MHz and sent 13 channels to firmware. A subsequent 5 GHz scan
>
> can you share more details on how the frequency range is updated to cover only 2 GHz band ?
>
> > failed with WMI_SCAN_REASON_INTERNAL_FAILURE. With both ranges combined,
> > the range is 2402-5835 MHz and 26 channels are sent to firmware.
> >
> > Index cap.band[] with NL80211_BAND_* and update 5 GHz for single-pdev
> > devices even when 6 GHz is supported.
> >
> > Tested-on: WCN7850 hw2.0 PCI WLAN.HMT.1.1.c7-00108-QCAHMTSWPL_V1.0_V2.0_SILICONZ_UPSTREAM-3
> >
> > Fixes: 0d777aa2ca77 ("wifi: ath12k: fix mac pdev frequency range update")
> > Cc: stable@xxxxxxxxxxxxxxx
> > Assisted-by: Codex:GPT-5.6 Sol
> > Signed-off-by: Shenghan Gao <gsh20040816@xxxxxxxxx>
> > ---
> > Testing notes:
> >
> > - Runtime testing was performed on WCN7850 under the CN regulatory domain.
> > - 2.4 and 5 GHz scanning and 5 GHz association were verified.
> > - 6 GHz operation was not tested because it is unavailable under the CN
> >   regulatory domain.
> > - QCC2072 was not tested because the hardware was not available.
> >
> >  drivers/net/wireless/ath/ath12k/reg.c | 7 ++++---
> >  1 file changed, 4 insertions(+), 3 deletions(-)
> >
> > diff --git a/drivers/net/wireless/ath/ath12k/reg.c b/drivers/net/wireless/ath/ath12k/reg.c
> > index 89abf2e87ad1..c3bb1df2b1e2 100644
> > --- a/drivers/net/wireless/ath/ath12k/reg.c
> > +++ b/drivers/net/wireless/ath/ath12k/reg.c
> > @@ -300,7 +300,7 @@ int ath12k_regd_update(struct ath12k *ar, bool init)
> >
> >       if (supported_bands & WMI_HOST_WLAN_2GHZ_CAP) {
> >               if (ab->hw_params->single_pdev_only) {
> > -                     phy_id = ar->pdev->cap.band[WMI_HOST_WLAN_2GHZ_CAP].phy_id;
> > +                     phy_id = ar->pdev->cap.band[NL80211_BAND_2GHZ].phy_id;
> >                       reg_cap = &ab->hal_reg_cap[phy_id];
> >               }
> >
> > @@ -310,9 +310,10 @@ int ath12k_regd_update(struct ath12k *ar, bool init)
> >               ath12k_mac_update_freq_range(ar, freq_low, freq_high);
> >       }
> >
> > -     if (supported_bands & WMI_HOST_WLAN_5GHZ_CAP && !ar->supports_6ghz) {
> > +     if (supported_bands & WMI_HOST_WLAN_5GHZ_CAP &&
> > +         (!ar->supports_6ghz || ab->hw_params->single_pdev_only)) {
> >               if (ab->hw_params->single_pdev_only) {
> > -                     phy_id = ar->pdev->cap.band[WMI_HOST_WLAN_5GHZ_CAP].phy_id;
> > +                     phy_id = ar->pdev->cap.band[NL80211_BAND_5GHZ].phy_id;
> >                       reg_cap = &ab->hal_reg_cap[phy_id];
> >               }
> >
> >
> > base-commit: a1a21995c2e1cc2ca6b2226cfe4f5f018370182a
>