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Mon, 30 Mar 2026 16:39:29 -0400 (EDT) X-Mailer: MessagingEngine.com Webmail Interface From: Javier Tia Date: Mon, 30 Mar 2026 14:39:24 -0600 Subject: [PATCH v4 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: <20260330-mt7927-bt-support-v4-2-cecc025e7062@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/pANAwAKAbXuwwuoZ3cfAcsmYgBpyt96xQLJ1xKInvOGY+L6/3C/N96NX9Sl453n9 7Hr8Stf68qJAbMEAAEKAB0WIQSbE7ILzw7eI0VKk8m17sMLqGd3HwUCacrfegAKCRC17sMLqGd3 H9HXC/0RTzkQgqOzxN7Hd+6yML4k0nhRPO1lySrwjRVrtobdHKih5L+DG9DYUYFm7eGDbPVwlpf BwtsVW15midbi073Np0k3I/wSAP8MThWbBjkyQvc2eULC5Q6z52Pz5qjFOk+bCrkKf14VjlcJQ3 EbgYWIkDDiOnr2moHM9fIRm9g00dRe53wVjmJsUPq/oNVJAGhdlwZd4mJ34zxcDufKdZTDNvYQm bZFQprR/RdRhzmaqoNgWH10VDj0rz0cgt+0aXzIhTWvJVoa6dIIx3/OAF4VxVcF/t35IfdN1aYG gAW6YbS2EfZe1BeDQsalp1pBH0aU4kODXY8r7YR+ge3Mud1WwUb2/J2BVaRHtzYx5jMcf1BLy0n CuWWxno3YvDfPmA2gFiNNY5Wlk1ZjI9TV49qnQEUYNZWeZNRftfJHFWvluRZfAWyhEUNSdyQuHb qx4Vl4rB7n7Nsi7hYk4tY+/GePkiqb7DL7XfHWkGL3pKEiKa9zc2zxFvdVIoqhxrO0+lA= X-Developer-Key: i=floss@jetm.me; a=openpgp; fpr=9B13B20BCF0EDE23454A93C9B5EEC30BA867771F In-Reply-To: <20260330-mt7927-bt-support-v4-0-cecc025e7062@jetm.me> References: <20260330-mt7927-bt-support-v4-0-cecc025e7062@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