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Wed, 25 Mar 2026 19:30:23 -0400 (EDT) X-Mailer: MessagingEngine.com Webmail Interface From: Javier Tia Date: Wed, 25 Mar 2026 17:30:19 -0600 Subject: [PATCH v2 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: <20260325-mt7927-bt-support-v2-2-b892a3252880@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=PKA6JAuHhBofd17Peep9P7qPZLwQxKZ//Y7wX8WEbCU=; b=owEB7QES/pANAwAKAbXuwwuoZ3cfAcsmYgBpxHAKikqVsqs90XfI7kOR65NCQmIpNqC4i3mJV u27IvXeY9OJAbMEAAEKAB0WIQSbE7ILzw7eI0VKk8m17sMLqGd3HwUCacRwCgAKCRC17sMLqGd3 H6fTC/9K1VUX6xnS5nqN3/Wh1LeBdDDKZcuoO9OKzpc0/NRBMCq4MiKh9nWAaPikN4+IDtYCk1a Fo7fzwM/Ad/kj2x5EsZ3iVAD3WCJCz0+/e3BQ6M9NubY4vkvlHk7/3U6btTHmRN4aSorlxUVpLo nbPesfbMxVTIkMK88qKJsRfUluUu0u1wUbAmludcooUPuptw4OL27JIA/uP3NkURoW95z8ya+V8 +sIywaFyqcOsHAzqg6dBIEfAYK31wipBaFKr19Gh/klvfIQ1vSoXnTdQscLWQ3XlB+Q+BwLGfmL VUcG1XxXEOl1P7e4btSSlZlL3NjgUGOYGB5G7R38wpdS7JfVYuqV54oadKQjt2+ByFnpuiJJVQa vcC9jDY75GRDTzb3fYckL45qXM4WFdIugcmKBafWno1dGLNKcf8Q2DdWLEtR10zBoTvP6zMUJhm bbDdoeVSElZ17wf5W1F1dXpT2k0DWhkPrOKF+eMcrpjSIewu0Vcn7ZrpJmM7w88WASlbc= X-Developer-Key: i=floss@jetm.me; a=openpgp; fpr=9B13B20BCF0EDE23454A93C9B5EEC30BA867771F In-Reply-To: <20260325-mt7927-bt-support-v2-0-b892a3252880@jetm.me> References: <20260325-mt7927-bt-support-v2-0-b892a3252880@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 13c6e45deede..06ba0dcd6527 100644 --- a/drivers/bluetooth/btmtk.c +++ b/drivers/bluetooth/btmtk.c @@ -1013,7 +1013,8 @@ 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