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Tue, 31 Mar 2026 13:09:36 -0400 (EDT) X-Mailer: MessagingEngine.com Webmail Interface From: Javier Tia Date: Tue, 31 Mar 2026 11:09:32 -0600 Subject: [PATCH v5 2/8] Bluetooth: btmtk: fix ISO interface setup for single alt setting 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: <20260331-mt7927-bt-support-v5-2-6f31b4342daa@jetm.me> To: Marcel Holtmann , Luiz Augusto von Dentz , Matthias Brugger , AngeloGioacchino Del Regno Cc: linux-bluetooth@vger.kernel.org, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-mediatek@lists.infradead.org, Ryan Gilbert X-Mailer: b4 0.15.1 X-Developer-Signature: v=1; a=openpgp-sha256; l=1386; i=floss@jetm.me; h=from:subject:message-id; bh=BeW2hWsgHTDse1WiYc/ZGW8ev0c1HREFra5Yo0QtNu0=; b=owEB7QES/pANAwAKAbXuwwuoZ3cfAcsmYgBpy//KzLI2ynp6LnsK7ukxs6g0PhwfnyavYRq+x qePMXxP+DOJAbMEAAEKAB0WIQSbE7ILzw7eI0VKk8m17sMLqGd3HwUCacv/ygAKCRC17sMLqGd3 H+5VC/9d1bzG0rXRi9zr+mdywb2NSyf/kyrAMN1+7jfSnBFw+QNqHnQMgVlKvHNySuZAmCSgKgl QFgTHlamlpFClp8sAQJagpXXPyq6RUzSMGqzx9lQMsKzkzXp8NrcoryevkC/wGFP/HYNnXyiunp ADbThnvo04NlieYpWoQMThvcfHSVKCrVnuWzkTrBynhzxyjS63b5iJudBhD4zULx49BaDvJ10Vh faQJmRtjxmFn+xuj8M7PQe8S+NDyafNG7wDJGMm+ygMynHreAsNYqREOMmopjkDBYePXhSfovLL letHGPvEUVs/XD0NzxI0RSS4uv1sfhRZdvnVO2RkbLy8aoR8PUiUgsnQQU7HNNaYJF8wgQ9YNq5 gDIMMy3EgZ8Chl0VLoSp5idokHHA6NsqKI13brgGVRONst5WBZPcypvtXFmkyCLXzLvtE40OuB4 3EXLjCPcfq8ZVfEFAIIb4jY7GUGxSgD+F/4X/E3KGSU97jcYQn6SBSCAIVBC+qek1ZsO4= X-Developer-Key: i=floss@jetm.me; a=openpgp; fpr=9B13B20BCF0EDE23454A93C9B5EEC30BA867771F In-Reply-To: <20260331-mt7927-bt-support-v5-0-6f31b4342daa@jetm.me> References: <20260331-mt7927-bt-support-v5-0-6f31b4342daa@jetm.me> Some MT6639 Bluetooth USB interfaces (e.g. IMC Networks 13d3:3588 on ASUS ROG STRIX X870E-E and ProArt X870E-Creator boards) expose only a single alternate setting (alt 0) on the ISO interface. The driver unconditionally requests alt setting 1, which fails with EINVAL on these devices, causing a ~20 second initialization delay and no LE audio support. Check the number of available alternate settings before selecting one. If only alt 0 exists, use it; otherwise request alt 1 as before. Closes: https://github.com/jetm/mediatek-mt7927-dkms/pull/39 Signed-off-by: Javier Tia Reported-by: Ryan Gilbert Tested-by: Ryan Gilbert --- drivers/bluetooth/btmtk.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/drivers/bluetooth/btmtk.c b/drivers/bluetooth/btmtk.c index 4af19b86c551..f8cff895f14c 100644 --- a/drivers/bluetooth/btmtk.c +++ b/drivers/bluetooth/btmtk.c @@ -1029,7 +1029,8 @@ static int __set_mtk_intr_interface(struct hci_dev *h= dev) if (!btmtk_data->isopkt_intf) return -ENODEV; =20 - err =3D usb_set_interface(btmtk_data->udev, MTK_ISO_IFNUM, 1); + err =3D usb_set_interface(btmtk_data->udev, MTK_ISO_IFNUM, + (intf->num_altsetting > 1) ? 1 : 0); if (err < 0) { bt_dev_err(hdev, "setting interface failed (%d)", -err); return err; --=20 2.53.0