linux-kernel - RE: 6 Ghz frequencies always listed as disabled in newer kernels with Mediatek MT7921K (RZ608)

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Message-ID: <SI2PR03MB532296077BDB2BEBE79DDB2885FC2@SI2PR03MB5322.apcprd03.prod.outlook.com>
Date: Wed, 12 Feb 2025 02:18:06 +0000
From: Mingyen Hsieh (謝明諺)
	<Mingyen.Hsieh@...iatek.com>
To: Slavi Pantaleev <slavi@...ture.com>, Felix Fietkau <nbd@....name>,
	"Lorenzo Bianconi" <lorenzo@...nel.org>, Ryder Lee <Ryder.Lee@...iatek.com>,
	Kalle Valo <kvalo@...nel.org>, Matthias Brugger <matthias.bgg@...il.com>,
	AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>,
	Deren Wu (武德仁) <Deren.Wu@...iatek.com>,
	"linux-wireless@...r.kernel.org" <linux-wireless@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org"
	<linux-arm-kernel@...ts.infradead.org>, "linux-mediatek@...ts.infradead.org"
	<linux-mediatek@...ts.infradead.org>
Subject: RE: 6 Ghz frequencies always listed as disabled in newer kernels with
 Mediatek MT7921K (RZ608)

Hi Slavi,

Thank you for reporting this issue.
I will look into what went wrong.

Best Regards,
Yen.

-----Original Message-----
From: Slavi Pantaleev <slavi@...ture.com> 
Sent: Monday, February 10, 2025 10:56 PM
To: Felix Fietkau <nbd@....name>; Lorenzo Bianconi <lorenzo@...nel.org>; Ryder Lee <Ryder.Lee@...iatek.com>; Kalle Valo <kvalo@...nel.org>; Matthias Brugger <matthias.bgg@...il.com>; AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>; Mingyen Hsieh (謝明諺) <Mingyen.Hsieh@...iatek.com>; Deren Wu (武德仁) <Deren.Wu@...iatek.com>; linux-wireless@...r.kernel.org; linux-kernel@...r.kernel.org; linux-arm-kernel@...ts.infradead.org; linux-mediatek@...ts.infradead.org
Subject: 6 Ghz frequencies always listed as disabled in newer kernels with Mediatek MT7921K (RZ608)


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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