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Thu, 26 Mar 2026 18:13:09 -0400 (EDT) X-Mailer: MessagingEngine.com Webmail Interface From: Javier Tia Date: Thu, 26 Mar 2026 16:13:05 -0600 Subject: [PATCH v3 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: <20260326-mt7927-bt-support-v3-2-fa7ebd424323@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 0.15.0 X-Developer-Signature: v=1; a=openpgp-sha256; l=1384; i=floss@jetm.me; h=from:subject:message-id; bh=vyqsuG+xMWp5r+4UqeMvlmZYwWcpk/QUCdD0Ktx12jc=; b=owEB7QES/pANAwAKAbXuwwuoZ3cfAcsmYgBpxa9vnNeIgkcFvVYWCjalmAp4NNE1jOUDr/QL0 XvgY76y+CuJAbMEAAEKAB0WIQSbE7ILzw7eI0VKk8m17sMLqGd3HwUCacWvbwAKCRC17sMLqGd3 H+n1C/91CTJlh3xtD/NBx/OnfHnX5rITmaoOC5orPA6FwDZnKpKFRvPRQb3QFwboxgiMZwVL1Ma 6Dc7h3Xuga0HhMCmp/DW4TXzIkg7mR4Ul9ytqTBnuDuRREh332E8cJaeMNaPt8heKksWthfaVR+ ULGvztC68IGk0J2rlbyIahHH1C1grLr1I+n/AzsegAP0E25wR5Tib8p+xKmlT50/Xeyg/gU+u9D E5jPjyEDrU3TiwKSbvgrl0zKsmKrc9X+ubzlc2ZLE2eCb0wJCp1etbD6IqAj8n+7klg/bu24yoT N4C0gTDnizDDC4+mLrwpzP2RKU2Mny61CFF3oWD4FsEw3e0O2tEwRHsvbEq4XKRHsFDCKe9uHvk ML1+gIS228KHTyaZtICKgbolPOB7U/X1NHuWqp7WG7PUHM3iR+sA2qB+ktHZe1fV0Kj11xbGyzw 13gLkgytVqScilGi6kVh4UXaw8w4lqMsPBezr5d8inHqaGX/6U1/YM7SdOoaJDXDnfCqo= X-Developer-Key: i=floss@jetm.me; a=openpgp; fpr=9B13B20BCF0EDE23454A93C9B5EEC30BA867771F In-Reply-To: <20260326-mt7927-bt-support-v3-0-fa7ebd424323@jetm.me> References: <20260326-mt7927-bt-support-v3-0-fa7ebd424323@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. Link: 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 3f12f2ab6369..95b09b1ea78f 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