Re: Enabling 6 GHz band in WCN785x

[Baochen Qiang <baochen.qiang@oss.qualcomm.com>]

On 8/13/2025 6:22 AM, Petros Christopoulos wrote:
> Dear Baochen,
> 
> I tried the kernel 6.16.0 today (kernel-6.16.0-200.fc42.x86_64.rpm; it is Fedora kernel
> test week now) which contains the commit dcfebfd4c8dc0bec9b6649104cecc09f5978c4cb 
> (=revision v6.16-rc1~132^2~157^2~16^2~62)
> 
> but the behavior regarding the Wifi module WCN785x has not changed:
> 
> despite  sudo iw reg set DE,
> phy#0 remains self managed (see below at the end)
> 
> However, the option CONFIG_ATH_REG_DYNAMIC_USER_REG_HINTS is not enabled in the Fedora
> kernel, and I have asked the maintainers if this could be enabled (everything is of course
> simpler if I do not have to recompile every kernel myself, https://bugzilla.redhat.com/
> show_bug.cgi?id=2387486)
> 
> I noticed this option is relevant inside the ath12k code, e.g.
> 
> $ grep -r CONFIG_ATH_REG_DYNAMIC_USER_REG_HINTS drivers/net/wireless/ath/ath12k/
> drivers/net/wireless/ath/ath12k/reg.c:  if (!
> IS_ENABLED(CONFIG_ATH_REG_DYNAMIC_USER_REG_HINTS)) {
> 
> Could you please let me know:
> 
> 1. whether having this option enebled in the kernel is absolutely necessary for the
> ability to change the region or there are also alternatives?

The option is only necessary if you want to manually set the country code. Normally the
driver/firmware should be able to detect automatically the country from AP's frames using
11D feature.

11D feature takes some time to detect country info, so please wait, say at least 1 minute,
before you make conclusion. If still fail, please help collect verbose ath12k log with

	modprobe ath12k debug_mask=0xffffffff

> 
> 2. whether if this option is enabled with kernel 6.16.0 (with the commit above), I should
> be able to change the region of the WCN785x module with a simple sudo iw reg set DE, or
> whether still another special method will be necessary?
Enabling CONFIG_ATH_REG_DYNAMIC_USER_REG_HINTS will let you be able to set country code
using iw. There is no alternative for this purpose.

> 
> Thank you very much and kind regards
> 
> Petros
> 
> 
> global
> country DE: DFS-ETSI
>         (2400 - 2483 @ 40), (N/A, 20), (N/A)
>         (5150 - 5250 @ 80), (N/A, 23), (N/A), NO-OUTDOOR, AUTO-BW
>         (5250 - 5350 @ 80), (N/A, 20), (0 ms), NO-OUTDOOR, DFS, AUTO-BW
>         (5470 - 5725 @ 160), (N/A, 26), (0 ms), DFS
>         (5725 - 5875 @ 80), (N/A, 13), (N/A)
>         (5945 - 6425 @ 320), (N/A, 23), (N/A), NO-OUTDOOR
>         (57000 - 66000 @ 2160), (N/A, 40), (N/A)
> 
> phy#0 (self-managed)
> country 00: DFS-UNSET
>         (2402 - 2472 @ 40), (N/A, 20), (N/A)
>         (2457 - 2482 @ 20), (N/A, 20), (N/A), PASSIVE-SCAN
>         (5170 - 5330 @ 160), (N/A, 20), (N/A), AUTO-BW, PASSIVE-SCAN
>         (5490 - 5730 @ 160), (N/A, 20), (N/A), AUTO-BW, PASSIVE-SCAN
>         (5735 - 5895 @ 160), (N/A, 20), (N/A), AUTO-BW, PASSIVE-SCAN
> 
> 
> 
> 
> 
> 
> 
> On 12.08.2025 05:21, Baochen Qiang wrote:
>>
>> On 8/10/2025 9:56 PM, Petros Christopoulos wrote:
>>> Dear all, I have a Qualcomm Technologies, Inc WCN785x Wi-Fi 7(802.11be) 320MHz 2x2
>>> [FastConnect 7800] [17cb:1107] (rev 01) Wifi controller
>>> with Fedora 42 KDE, latest kernel 6.15.9-201.fc42.x86_64 and recent firmware 0x1108811c
>>> fw_build_timestamp 2025-05-17 00:21 fw_build_id
>>> QC_IMAGE_VERSION_STRING=WLAN.HMT.1.1.c5-00284.1-QCAHMTSWPL_V1.0_V2.0_SI
>>> LICONZ-3
>>>
>>> The 6 GHz band is disabled, I suspect that the problem is the 00 region setting in phy#1,
>>> however as this is "self-managed" I have not managed to change this (iw reg set or an /
>>> etc/modprobe.d/ath12k.conf file with "options ath12k country=DE" have no effects).
>> Try with CONFIG_ATH_REG_DYNAMIC_USER_REG_HINTS enabled.
>>
>>> $ iw reg get
>>> global
>>> country DE: DFS-ETSI
>>> (2400 - 2483 @ 40), (N/A, 20), (N/A)
>>> (5150 - 5250 @ 80), (N/A, 23), (N/A), NO-OUTDOOR, AUTO-BW
>>> (5250 - 5350 @ 80), (N/A, 20), (0 ms), NO-OUTDOOR, DFS, AUTO-BW
>>> (5470 - 5725 @ 160), (N/A, 26), (0 ms), DFS
>>> (5725 - 5875 @ 80), (N/A, 13), (N/A)
>>> (5945 - 6425 @ 320), (N/A, 23), (N/A), NO-OUTDOOR
>>> (57000 - 66000 @ 2160), (N/A, 40), (N/A)
>>>
>>> phy#1 (self-managed)
>>> country 00: DFS-UNSET
>>> (2402 - 2472 @ 40), (N/A, 20), (N/A)
>>> (2457 - 2482 @ 20), (N/A, 20), (N/A), PASSIVE-SCAN
>>> (5170 - 5330 @ 160), (N/A, 20), (N/A), AUTO-BW, PASSIVE-SCAN
>>> (5490 - 5730 @ 160), (N/A, 20), (N/A), AUTO-BW, PASSIVE-SCAN
>>> (5735 - 5895 @ 160), (N/A, 20), (N/A), AUTO-BW, PASSIVE-SCAN
>>>
>>> I have searched extensively the web, found some relevant articles (e.g. https://
>>> patchwork.kernel.org/project/linux-wireless/patch/20250401020840.357-5-
>>> quic_kangyang@quicinc.com/, which should be integrated into 6.15.9 if I understand
>>> correctly), but still no solution.
>> Do you mean with the whole 11D support series merged the issue is still seen?
>>
>>> I would be grateful for some help.
>>>
>>> Thank you very much.
>>>
>>>
>>
>>