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Fri, 21 Aug 2026 01:18:58 -0700 (PDT) From: Valera Kozlov To: bmork@telenor.net Cc: amadeus@jmu.edu.cn, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, linux-mediatek@lists.infradead.org, linux-wireless@vger.kernel.org, lorenzo@kernel.org, nbd@nbd.name, ryder.lee@mediatek.com, sean.wang@mediatek.com, shayne.chen@mediatek.com Subject: Re: [PATCH 1/1] wifi: mt76: mt7996: fix mixed FEM check of mt7996 chipset Date: Fri, 21 Aug 2026 11:18:30 +0300 Message-ID: <20260821081830.280417-1-valera.kozlov19@gmail.com> X-Mailer: git-send-email 2.53.0 In-Reply-To: <87a4z9f7a5.fsf@miraculix.mork.no> References: <87a4z9f7a5.fsf@miraculix.mork.no> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Device: ASUS ZenWiFi BT8 (RT-BE14000), MediaTek MT7988D SoC (tri-band, dual PCIe hif/hif2). Confirmed empirically via extended TX PER testing that adie_idx=1 is correct for this board (matches Chukun's patch), consistent with a mixed-FEM design. Readouts from the ADIE_ID registers: root@bt8:~# echo 0x0f00002c >/sys/kernel/debug/ieee80211/phy0/mt76/regidx root@bt8:~# grep . /sys/kernel/debug/ieee80211/phy0/mt76/rf_regval 0x79768a20 root@bt8:~# echo 0x1f00002c >/sys/kernel/debug/ieee80211/phy0/mt76/regidx root@bt8:~# grep . /sys/kernel/debug/ieee80211/phy0/mt76/rf_regval 0x79778a10 root@bt8:~# echo 0x2f00002c >/sys/kernel/debug/ieee80211/phy0/mt76/regidx root@bt8:~# grep . /sys/kernel/debug/ieee80211/phy0/mt76/rf_regval 0x79778a10 Note that band1/band2 (0x79778a10) match the EE4600 signature exactly (needs adie_idx=1), but band0 (0x79768a20) differs from both Zyxel devices reported so far (both show 0x79758a02 regardless of which adie_idx they need). This is a third, distinct band0 signature - suggests band0 alone may not reliably disambiguate the two cases, since devices needing different adie_idx values can share it. Happy to test further register dumps or a proposed fix on this hardware if useful.