[PATCH] wifi: ath12k: Remove broken frequency range filtering

[Baochen Qiang]

On 1/23/2026 11:57 PM, Saikiran wrote:
> Between kernel 6.16 and 6.17, ath12k added frequency range filtering in
> ath12k_reg_update_chan_list() that filters channels based on
> ar->freq_range.start_freq and ar->freq_range.end_freq.
> 
> However, these values are reset to 0 in ath12k_regd_update(), causing

Yes, it is reset at the first, but it get re-calculated later. See
ath12k_mac_update_freq_range() called in ath12k_regd_update().

> the filter to skip ALL channels:
>     if (channel_freq < 0 || channel_freq > 0)  // Always true when end_freq=0
>         continue;  // All channels skipped
> 
> This results in no channel list sent to firmware, causing 5 GHz Wi-Fi
> to stop working.
> 
> Fix by removing the broken frequency range filtering. The firmware
> itself handles frequency range restrictions based on hardware capabilities.
> 
> Tested-on: WCN7850 hw2.0 PCI WLAN.HMT.1.1.c5-00302 (Lenovo Yoga Slim 7x)
> 
> Signed-off-by: Saikiran <bjsaikiran at gmail.com>
> ---
>  drivers/net/wireless/ath/ath12k/reg.c | 13 -------------
>  1 file changed, 13 deletions(-)
> 
> diff --git a/drivers/net/wireless/ath/ath12k/reg.c b/drivers/net/wireless/ath/ath12k/reg.c
> index 2dfcef013277..2d9adc74ac6e 100644
> --- a/drivers/net/wireless/ath/ath12k/reg.c
> +++ b/drivers/net/wireless/ath/ath12k/reg.c
> @@ -153,12 +153,6 @@ int ath12k_reg_update_chan_list(struct ath12k *ar, bool wait)
>  			if (bands[band]->channels[i].flags &
>  			    IEEE80211_CHAN_DISABLED)
>  				continue;
> -			/* Skip Channels that are not in current radio's range */
> -			if (bands[band]->channels[i].center_freq <
> -			    KHZ_TO_MHZ(ar->freq_range.start_freq) ||
> -			    bands[band]->channels[i].center_freq >
> -			    KHZ_TO_MHZ(ar->freq_range.end_freq))
> -				continue;
>  
>  			num_channels++;
>  		}
> @@ -190,13 +184,6 @@ int ath12k_reg_update_chan_list(struct ath12k *ar, bool wait)
>  			if (channel->flags & IEEE80211_CHAN_DISABLED)
>  				continue;
>  
> -			/* Skip Channels that are not in current radio's range */
> -			if (bands[band]->channels[i].center_freq <
> -			    KHZ_TO_MHZ(ar->freq_range.start_freq) ||
> -			    bands[band]->channels[i].center_freq >
> -			    KHZ_TO_MHZ(ar->freq_range.end_freq))
> -				continue;
> -
>  			/* TODO: Set to true/false based on some condition? */
>  			ch->allow_ht = true;
>  			ch->allow_vht = true;