6 Ghz frequencies always listed as disabled in newer kernels with Mediatek MT7921K (RZ608)

[ggo at tuxedocomputers.com]

Hi Yen,

Friendly reminder of this topic.

We have the same problem with RZ608 and RZ616: All 6GHz channels are
disabled by mt7921_regd_channel_update().

Is there anything I can do to help?

Regards,
Georg


Am 12.02.25 um 03:18 schrieb Mingyen Hsieh (謝明諺):
> Hi Slavi,
> 
> Thank you for reporting this issue.
> I will look into what went wrong.
> 
> Best Regards,
> Yen.
> 
> -----Original Message-----
> From: Slavi Pantaleev <slavi at devture.com> 
> Sent: Monday, February 10, 2025 10:56 PM
> To: Felix Fietkau <nbd at nbd.name>; Lorenzo Bianconi <lorenzo at kernel.org>; Ryder Lee <Ryder.Lee at mediatek.com>; Kalle Valo <kvalo at kernel.org>; Matthias Brugger <matthias.bgg at gmail.com>; AngeloGioacchino Del Regno <angelogioacchino.delregno at collabora.com>; Mingyen Hsieh (謝明諺) <Mingyen.Hsieh at mediatek.com>; Deren Wu (武德仁) <Deren.Wu at mediatek.com>; linux-wireless at vger.kernel.org; linux-kernel at vger.kernel.org; linux-arm-kernel at lists.infradead.org; linux-mediatek at lists.infradead.org
> Subject: 6 Ghz frequencies always listed as disabled in newer kernels with Mediatek MT7921K (RZ608)
> 
> 
> External email : Please do not click links or open attachments until you have verified the sender or the content.
> 
> 
> Hello!
> 
> This is in regard to Bugzilla Bug 218731 - Tri-band AMD RZ608 (MediaTek
> MT7921K) has 6GHz band disabled in kernel 6.7+ despite working in <=6.6
> 
> URL: https://urldefense.com/v3/__https://bugzilla.kernel.org/show_bug.cgi?id=218731__;!!CTRNKA9wMg0ARbw!hwgyrPE5EUmlhv276MLdhh3io-OmXeYvNMVGUpAUbJ7wgc9z8WI4fZoD0Ze1WlIlqf_1qrieE1unap_P8_E$
> 
> I'm in Bulgaria and `iw reg get` reports this:
> 
> ```
> global
> country BG: 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 @ 160), (N/A, 23), (N/A), NO-OUTDOOR
>          (57000 - 66000 @ 2160), (N/A, 40), (N/A) ```
> 
> For testing purposes, I've also tried switching to another regulatory domain (`US`, `DE`, `SE`, `NL`) via `iw reg set ..`.
> 
> Regardless of the regulatory domain, `iw list | grep -A 15 Frequencies` always reports the 6 Ghz frequencies as disabled on newer kernels.
> 
> As the original bug reporter has discovered, the regression begins to appear in kernel 6.7.0 while it isn't present in 6.6.30.
> I've done a bisection and the results are like this:
> 
> 1. [bad] mainline (954a209f431c06b62718a49b403bd4c549f0d6fb)
> 2. [good] v6.6.30
> 3. [bad] v6.7.12
> 4. [good] v6.6
> 5. [bad] edd8e84ae9514e93368f56c3715b11af52df6c3b
> 6. [bad] 89ed67ef126c4160349c1b96fdb775ea6170ac90
> 7. [good] b827ac419721a106ae2fccaa40576b0594edad92
> 8. [bad] d1a02ed66fe62aa2edd77bd54e270ebc33bd12ff
> 9. [good] 3abbd0699b678fc48e0100704338cff9180fe4bb
> 10. [good] 5a423552e0d9bb882f22cb0bf85f520ca2692706
> 11. [bad] 56a7bb12c78ffa1b02e154b1d779ed2a1555fa3c
> 12. [good] a3c2dd96487f1dd734c9443a3472c8dafa689813
> 13. [bad] 089482a06b74a40d45773b1871182e8f04be026b
> 14. [good] fce9c967820a72f600abbf061d7077861685a14d
> 15. [good] c948b5da6bbec742b433138e3e3f9537a85af2e5
> 16. [good] 9585316a2aaf773a67846bdc8bbdd4df1e9622fa
> 17. [good] 51ba0e3a15eb1643116a93674e230e11b9499592
> 18. [bad] 09382d8f8641bc12fffc41a93eb9b37be0e653c0
> 19. [good] 4fc8df50fd41c2762d893211487be0ecb24c6a05
> 
> 09382d8f8641bc12fffc41a93eb9b37be0e653c0 is reported as the first bad commit.
> 
> URL:
> https://urldefense.com/v3/__https://kernel.googlesource.com/pub/scm/linux/kernel/git/stable/linux/*/09382d8f8641bc12fffc41a93eb9b37be0e653c0__;Kw!!CTRNKA9wMg0ARbw!hwgyrPE5EUmlhv276MLdhh3io-OmXeYvNMVGUpAUbJ7wgc9z8WI4fZoD0Ze1WlIlqf_1qrieE1unR0MDLCs$
> 
> Regards
>