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

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Message-Id: <20251110120110.193562-1-amadeus@jmu.edu.cn>
Date: Mon, 10 Nov 2025 20:01:10 +0800
From: Chukun Pan <amadeus@....edu.cn>
To: Felix Fietkau <nbd@....name>
Cc: Ryder Lee <ryder.lee@...iatek.com>,
	Sean Wang <sean.wang@...iatek.com>,
	Shayne Chen <shayne.chen@...iatek.com>,
	Lorenzo Bianconi <lorenzo@...nel.org>,
	linux-arm-kernel@...ts.infradead.org,
	linux-mediatek@...ts.infradead.org,
	linux-wireless@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Chukun Pan <amadeus@....edu.cn>
Subject: [PATCH 1/1] wifi: mt76: mt7996: fix mixed FEM check of mt7996 chipset

To support the following varaint of the mt7996 chipset:
- tri-band: band0 iFEM and band1/band2 eFEM

We should read band1 for the determination, using band0
will incorrectly identify it as iFEM.
This is also the judgment logic of the mt7992 chipset.

This fixes the load error on the Quantum Fiber W1701K:
mt7996e 0000:01:00.0: eeprom load fail, use default bin
mt7996e 0000:01:00.0: Message 0012002d (seq 5) timeout

Fixes: e8cb33ad546a ("wifi: mt76: mt7996: add support for more variants")
Signed-off-by: Chukun Pan <amadeus@....edu.cn>
---
 drivers/net/wireless/mediatek/mt76/mt7996/init.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/wireless/mediatek/mt76/mt7996/init.c b/drivers/net/wireless/mediatek/mt76/mt7996/init.c
index 5e95a36b42d1..143400541746 100644
--- a/drivers/net/wireless/mediatek/mt76/mt7996/init.c
+++ b/drivers/net/wireless/mediatek/mt76/mt7996/init.c
@@ -1137,7 +1137,7 @@ static int mt7996_variant_fem_init(struct mt7996_dev *dev)
 		adie_idx = (val & MT_PAD_GPIO_ADIE_SINGLE) ? 0 : 1;
 		adie_comb = u32_get_bits(val, MT_PAD_GPIO_ADIE_COMB_7992);
 	} else {
-		adie_idx = 0;
+		adie_idx = 1;
 		adie_comb = u32_get_bits(val, MT_PAD_GPIO_ADIE_COMB);
 	}
 
-- 
2.25.1