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Thu, 26 Mar 2026 17:12:43 -0400 (EDT) X-Mailer: MessagingEngine.com Webmail Interface From: Javier Tia Date: Thu, 26 Mar 2026 15:12:33 -0600 Subject: [PATCH v4 9/9] wifi: mt76: mt7925: disable ASPM and runtime PM for MT7927 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Message-Id: <20260326-mt7927-wifi-support-v4-v4-9-8ab465addcfe@jetm.me> To: Felix Fietkau , Lorenzo Bianconi , Ryder Lee , Shayne Chen , Sean Wang , Matthias Brugger , AngeloGioacchino Del Regno , Ming Yen Hsieh , Deren Wu Cc: linux-wireless@vger.kernel.org, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-mediatek@lists.infradead.org X-Mailer: b4 0.15.0 X-Developer-Signature: v=1; a=openpgp-sha256; l=2658; i=floss@jetm.me; h=from:subject:message-id; bh=EttSMB/87XiHGZhWtMpgNAtlCMJydT4Yjw9bIPiDhNI=; b=owEB7QES/pANAwAKAbXuwwuoZ3cfAcsmYgBpxaE4XROHqnZuTIUqW2OvGZAnfVNg6oApkpJue J8Tatn7ChSJAbMEAAEKAB0WIQSbE7ILzw7eI0VKk8m17sMLqGd3HwUCacWhOAAKCRC17sMLqGd3 H2JRC/wIb29AaG8RxZb+OShZ8cdeLylHN774vajS6QDNxzxJsJ1dK7saQwA2JNCjeaa3sCbB519 gLAjXEk9BiJ+r+KDX89Awezkobz19vwr9BB+gVt0sTiefzWyGdpQau4OTQOtr5YBIQcs1a4QKq/ vr/vdqJvm3GdwpM8DEJ/9SIPaAbQ3jLaq3XtWOGIb9lDZwlSqjVRYHRhlg9RdPi3kXbxu7WUqx8 DnOYGtfJ15g7MDzUsGiZwGxPa+7M0T8EwClgslKsaxebOx2mZR4VKqxTnVfcDXfqbpGsbCmM4K3 H8puUFKH3VqtqQonPfORsLaYdX2i/yHI4tiUEqkX/I2b1wll/0bIm9ioTEoxdrD4tXOJ4hJuWS0 9SP3umUsT+d0P6J62C7acUnAhnUM51U3F++RkgahzaUKdu/Grt/jhd37pBAdFNgLiACOih7RXCn N8hbJOTygBMxhGQD85nw1R/LBJKF/q2k7yQDRHPPhsKUEicJ2W9mlqjrM1hV78To6AXBI= X-Developer-Key: i=floss@jetm.me; a=openpgp; fpr=9B13B20BCF0EDE23454A93C9B5EEC30BA867771F In-Reply-To: <20260326-mt7927-wifi-support-v4-v4-0-8ab465addcfe@jetm.me> References: <20260326-mt7927-wifi-support-v4-v4-0-8ab465addcfe@jetm.me> Disable PCIe ASPM unconditionally for MT7927. The CONNINFRA power domain and WFDMA register access are unreliable with PCIe L1 active, causing throughput to drop from 1+ Gbps to ~200 Mbps. Disable runtime PM and deep sleep for MT7927. The combo chip shares a CONNINFRA power domain between WiFi (PCIe) and BT (USB). SET_OWN/CLR_OWN transitions on the LPCTL register crash the BT firmware, requiring a full power cycle to recover. PM enablement will be addressed in a follow-up once safe power state transitions are determined. Signed-off-by: Javier Tia --- drivers/net/wireless/mediatek/mt76/mt7925/init.c | 3 ++- drivers/net/wireless/mediatek/mt76/mt7925/pci.c | 6 ++++-- 2 files changed, 6 insertions(+), 3 deletions(-) diff --git a/drivers/net/wireless/mediatek/mt76/mt7925/init.c b/drivers/net= /wireless/mediatek/mt76/mt7925/init.c index 3ce5d6fcc69d..4766b9343953 100644 --- a/drivers/net/wireless/mediatek/mt76/mt7925/init.c +++ b/drivers/net/wireless/mediatek/mt76/mt7925/init.c @@ -230,7 +230,8 @@ int mt7925_register_device(struct mt792x_dev *dev) dev->pm.idle_timeout =3D MT792x_PM_TIMEOUT; dev->pm.stats.last_wake_event =3D jiffies; dev->pm.stats.last_doze_event =3D jiffies; - if (!mt76_is_usb(&dev->mt76)) { + /* MT7927: runtime PM crashes BT firmware on the shared CONNINFRA domain = */ + if (!mt76_is_usb(&dev->mt76) && !is_mt7927(&dev->mt76)) { dev->pm.enable_user =3D true; dev->pm.enable =3D true; dev->pm.ds_enable_user =3D true; diff --git a/drivers/net/wireless/mediatek/mt76/mt7925/pci.c b/drivers/net/= wireless/mediatek/mt76/mt7925/pci.c index 604c0e9ae7ba..1f05c212be02 100644 --- a/drivers/net/wireless/mediatek/mt76/mt7925/pci.c +++ b/drivers/net/wireless/mediatek/mt76/mt7925/pci.c @@ -350,7 +350,10 @@ static int mt7925_pci_probe(struct pci_dev *pdev, if (ret) goto err_free_pci_vec; =20 - if (mt7925_disable_aspm) + is_mt7927_hw =3D (pdev->device =3D=3D 0x6639 || pdev->device =3D=3D 0x792= 7); + + /* MT7927: ASPM L1 causes unreliable WFDMA register access */ + if (mt7925_disable_aspm || is_mt7927_hw) mt76_pci_disable_aspm(pdev); =20 ops =3D mt792x_get_mac80211_ops(&pdev->dev, &mt7925_ops, @@ -371,7 +374,6 @@ static int mt7925_pci_probe(struct pci_dev *pdev, dev =3D container_of(mdev, struct mt792x_dev, mt76); dev->fw_features =3D features; dev->hif_ops =3D &mt7925_pcie_ops; - is_mt7927_hw =3D (pdev->device =3D=3D 0x6639 || pdev->device =3D=3D 0x792= 7); dev->irq_map =3D is_mt7927_hw ? &mt7927_irq_map : &irq_map; mt76_mmio_init(&dev->mt76, pcim_iomap_table(pdev)[0]); tasklet_init(&mdev->irq_tasklet, mt792x_irq_tasklet, (unsigned long)dev); --=20 2.53.0