linux-kernel - Re: [PATCH 1/1] wifi: mt76: mt7996: fix mixed FEM check of mt7996 chipset

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Message-ID: <87a4z9f7a5.fsf@miraculix.mork.no>
Date: Tue, 23 Dec 2025 18:16:18 +0100
From: Bjørn Mork <bmork@...enor.net>
To: Chukun Pan <amadeus@....edu.cn>
Cc: linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linux-mediatek@...ts.infradead.org, linux-wireless@...r.kernel.org,
        lorenzo@...nel.org, nbd@....name, ryder.lee@...iatek.com,
        sean.wang@...iatek.com, shayne.chen@...iatek.com
Subject: Re: [PATCH 1/1] wifi: mt76: mt7996: fix mixed FEM check of mt7996
 chipset

Chukun Pan <amadeus@....edu.cn> writes:

>> The problem is that the patch breaks the other device variant, which
>> used to work before.  If we assume the eeprom data from Zyxel is
>> correct, then this variant is iFEM.
>
> Do you have the specific model name and what the RF chips are?
> The eeprom seems to be fine.

Device with iFEM+eFEM+eFEM, working with your patch:
Zyxel EE4600-00

Readouts from the ADIE_ID registers:

root@...600:~# echo 0x0f00002c >/sys/kernel/debug/ieee80211/phy0/mt76/regidx
root@...600:~# grep . /sys/kernel/debug/ieee80211/phy0/mt76/rf_regval 
0x79758a02
root@...600:~# echo 0x1f00002c >/sys/kernel/debug/ieee80211/phy0/mt76/regidx
root@...600:~# grep . /sys/kernel/debug/ieee80211/phy0/mt76/rf_regval 
0x79778a10
root@...600:~# echo 0x2f00002c >/sys/kernel/debug/ieee80211/phy0/mt76/regidx
root@...600:~# grep . /sys/kernel/debug/ieee80211/phy0/mt76/rf_regval 
0x79778a10

Device with iFEM+iFEM+iFEM, working before and breaking with your patch:
Zyxel WE4600-01

Readouts from the ADIE_ID registers:

root@...600:~# echo 0x0f00002c >/sys/kernel/debug/ieee80211/phy0/mt76/regidx
root@...600:~# grep . /sys/kernel/debug/ieee80211/phy0/mt76/rf_regval
0x79758a02
root@...600:~# echo 0x1f00002c >/sys/kernel/debug/ieee80211/phy0/mt76/regidx
root@...600:~# grep . /sys/kernel/debug/ieee80211/phy0/mt76/rf_regval
0x79778a11
root@...600:~# echo 0x2f00002c >/sys/kernel/debug/ieee80211/phy0/mt76/regidx
root@...600:~# grep . /sys/kernel/debug/ieee80211/phy0/mt76/rf_regval
0x79778a11


I don't know exactly what chips these are.  I have no specs or
datasheets and I haven't removed the heatsink and shielding




Bjørn