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Fri, 6 Mar 2026 19:33:43 -0500 (EST) X-Mailer: MessagingEngine.com Webmail Interface From: Javier Tia Date: Fri, 06 Mar 2026 18:33:25 -0600 Subject: [PATCH 06/18] wifi: mt76: mt7925: add MT7927 power management, DBDC, and CNM fixes 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: <20260306-mt7927-wifi-support-v1-6-c77e7445511d@jetm.me> To: linux-wireless@vger.kernel.org, Felix Fietkau , Lorenzo Bianconi , Ryder Lee , Shayne Chen , Sean Wang , Matthias Brugger , AngeloGioacchino Del Regno , Deren Wu , Ming Yen Hsieh Cc: linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-mediatek@lists.infradead.org, Marcin FM , Cristian-Florin Radoi , George Salukvadze , Evgeny Kapusta <3193631@gmail.com>, Samu Toljamo , Ariel Rosenfeld , Chapuis Dario , =?utf-8?q?Thibaut_Fran=C3=A7ois?= , =?utf-8?q?=E5=BC=A0=E6=97=AD=E6=B6=B5?= , Javier Tia X-Mailer: b4 0.14.3 X-Developer-Signature: v=1; a=openpgp-sha256; l=3842; i=floss@jetm.me; h=from:subject:message-id; bh=/GuNqbGp0WkGquAlj8TXYsYcaj5pBN2o2/Bv/wZ77ng=; b=owEB7QES/pANAwAKAbXuwwuoZ3cfAcsmYgBpq3JPuEuIqFx6W1+smCHLJTcMJHCbobukBVeO4 0RHZ8TnRL6JAbMEAAEKAB0WIQSbE7ILzw7eI0VKk8m17sMLqGd3HwUCaatyTwAKCRC17sMLqGd3 H9K+DACnuG0c74GfHj4EmBIxAGgIJnHfMdAEgsHrir/61rydL2mcGJfkFp13Cu+03E68r9u+qBM O/ocHHyE9zMcos/irDOrvSMTbFlt5vTYRsb53VAjLn4mivaJBCtvghRZiA9n242BH/blNqfi4CQ zIKn7vrE3ThAOff/fDR5J/TqepkU1+K142oALZfY/0+spChfkzIX2kf1dR8o+S79qApzPqJZGuV X/0eBlPQweihFSZ/YIO9MUBcdD5H7hf9EzX3Bky5dnNyxOKyKGib00OFsLQdeidOILzgre8CKCs 2WIbx06z5K0oxzfah2A8VjSBz4+axjhskQgCzp2tsNlo07A74JVL3YcnS9z6lpmv/onn4J2eMzn +VOXDzKV62NnuVE1H490fB5jWxrsF2ty31alL7Qr3n8Kix1cGeeUTGrBai4NdUO2v450F7ikR+i J+4f/nzykxSescfXkMkN4RwkqBe9I0b6XCJeFtCUBgYEBeL/Yz0pQ0Qo8MjuQp6b5RdV4= X-Developer-Key: i=floss@jetm.me; a=openpgp; fpr=9B13B20BCF0EDE23454A93C9B5EEC30BA867771F In-Reply-To: <20260306-mt7927-wifi-support-v1-0-c77e7445511d@jetm.me> References: <20260306-mt7927-wifi-support-v1-0-c77e7445511d@jetm.me> Three MT7927-specific fixes for WiFi functionality: 1. Disable runtime PM: Every CLR_OWN triggers the ROM to reinitialize WFDMA, destroying DMA ring configuration. Disable PM until the wake path properly handles MT7927. 2. Enable DBDC (dual-band): MT7927 firmware defaults to single-band (2.4GHz only). MT7925 firmware handles DBDC automatically, but MT7927 requires an explicit MCU_UNI_CMD(SET_DBDC_PARMS) with mbmc_en=3D1. Without this, 5GHz scan requests are silently discarded. 3. Force CNM capability: MT7927 firmware lacks the connac2 feature trailer, causing mt792x_get_mac80211_ops() to replace channel context operations with emulated stubs. This prevents ROC (remain on channel) before authentication, causing auth frames to be silently dropped. Force the CNM flag and restore mt7925_ops. Tested-by: Marcin FM Tested-by: Cristian-Florin Radoi Tested-by: George Salukvadze Tested-by: Evgeny Kapusta <3193631@gmail.com> Tested-by: Samu Toljamo Tested-by: Ariel Rosenfeld Tested-by: Chapuis Dario Tested-by: Thibaut Fran=C3=A7ois Tested-by: =E5=BC=A0=E6=97=AD=E6=B6=B5 Signed-off-by: Javier Tia --- drivers/net/wireless/mediatek/mt76/mt7925/init.c | 17 ++++++++++++++++- drivers/net/wireless/mediatek/mt76/mt7925/pci.c | 10 ++++++++++ 2 files changed, 26 insertions(+), 1 deletion(-) diff --git a/drivers/net/wireless/mediatek/mt76/mt7925/init.c b/drivers/net= /wireless/mediatek/mt76/mt7925/init.c index 3ce5d6fcc69d..1e9eadca3988 100644 --- a/drivers/net/wireless/mediatek/mt76/mt7925/init.c +++ b/drivers/net/wireless/mediatek/mt76/mt7925/init.c @@ -115,6 +115,18 @@ static int __mt7925_init_hardware(struct mt792x_dev *d= ev) if (ret) goto out; =20 + /* MT7927: Enable DBDC (dual-band) mode. Without this, firmware + * defaults to 2.4GHz only and ignores 5GHz scan requests. + * MT7925 firmware handles DBDC automatically. */ + if (is_mt7927(&dev->mt76)) { + ret =3D mt7925_mcu_set_dbdc(&dev->mphy, true); + if (ret) { + dev_warn(dev->mt76.dev, + "MT7927 DBDC enable failed: %d\n", ret); + ret =3D 0; + } + } + out: return ret; } @@ -230,7 +242,10 @@ 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: disable power management. Every CLR_OWN triggers the + * ROM to reinitialize WFDMA, destroying DMA ring configuration. + * Keep the device awake until the PM wake path handles MT7927. */ + 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 ca9ccfe9975c..dce9f30b68d7 100644 --- a/drivers/net/wireless/mediatek/mt76/mt7925/pci.c +++ b/drivers/net/wireless/mediatek/mt76/mt7925/pci.c @@ -527,6 +527,16 @@ static int mt7925_pci_probe(struct pci_dev *pdev, goto err_free_pci_vec; } =20 + /* MT7927 firmware lacks the connac2 feature trailer, so + * mt792x_get_mac80211_ops() can't detect CNM support and + * replaces chanctx/ROC/mgd_prepare_tx ops with stubs. + * Force CNM and restore the original mt7925 ops. */ + if ((pdev->device =3D=3D 0x6639 || pdev->device =3D=3D 0x7927) && + !(features & MT792x_FW_CAP_CNM)) { + features |=3D MT792x_FW_CAP_CNM; + memcpy(ops, &mt7925_ops, sizeof(*ops)); + } + mdev =3D mt76_alloc_device(&pdev->dev, sizeof(*dev), ops, &drv_ops); if (!mdev) { ret =3D -ENOMEM; --=20 2.53.0