From: Jian-Hong Pan jian-hong@endlessm.com
[ Upstream commit 7af3f558aca74f2ee47b173f1c27f6bb9a5b5561 ]
Realtek RTL8822BE BT chip on ASUS X420FA cannot be turned on correctly after on-off several times. Bluetooth daemon sets BT mode failed when this issue happens. Scanning must be active while turning off for this bug to be hit.
bluetoothd[1576]: Failed to set mode: Failed (0x03)
If BT is turned off, then turned on again, it works correctly again.
According to the vendor driver, the HCI_QUIRK_RESET_ON_CLOSE flag is set during probing. So, this patch makes Realtek's BT reset on close to fix this issue.
Link: https://bugzilla.kernel.org/show_bug.cgi?id=203429 Signed-off-by: Jian-Hong Pan jian-hong@endlessm.com Reviewed-by: Daniel Drake drake@endlessm.com Signed-off-by: Marcel Holtmann marcel@holtmann.org Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/bluetooth/btrtl.c | 20 ++++++++++++++++++++ drivers/bluetooth/btrtl.h | 6 ++++++ drivers/bluetooth/btusb.c | 1 + 3 files changed, 27 insertions(+)
diff --git a/drivers/bluetooth/btrtl.c b/drivers/bluetooth/btrtl.c index 208feef63de40..d04b443cad1f2 100644 --- a/drivers/bluetooth/btrtl.c +++ b/drivers/bluetooth/btrtl.c @@ -637,6 +637,26 @@ int btrtl_setup_realtek(struct hci_dev *hdev) } EXPORT_SYMBOL_GPL(btrtl_setup_realtek);
+int btrtl_shutdown_realtek(struct hci_dev *hdev) +{ + struct sk_buff *skb; + int ret; + + /* According to the vendor driver, BT must be reset on close to avoid + * firmware crash. + */ + skb = __hci_cmd_sync(hdev, HCI_OP_RESET, 0, NULL, HCI_INIT_TIMEOUT); + if (IS_ERR(skb)) { + ret = PTR_ERR(skb); + bt_dev_err(hdev, "HCI reset during shutdown failed"); + return ret; + } + kfree_skb(skb); + + return 0; +} +EXPORT_SYMBOL_GPL(btrtl_shutdown_realtek); + static unsigned int btrtl_convert_baudrate(u32 device_baudrate) { switch (device_baudrate) { diff --git a/drivers/bluetooth/btrtl.h b/drivers/bluetooth/btrtl.h index f1676144fce81..10ad40c3e42c2 100644 --- a/drivers/bluetooth/btrtl.h +++ b/drivers/bluetooth/btrtl.h @@ -55,6 +55,7 @@ void btrtl_free(struct btrtl_device_info *btrtl_dev); int btrtl_download_firmware(struct hci_dev *hdev, struct btrtl_device_info *btrtl_dev); int btrtl_setup_realtek(struct hci_dev *hdev); +int btrtl_shutdown_realtek(struct hci_dev *hdev); int btrtl_get_uart_settings(struct hci_dev *hdev, struct btrtl_device_info *btrtl_dev, unsigned int *controller_baudrate, @@ -83,6 +84,11 @@ static inline int btrtl_setup_realtek(struct hci_dev *hdev) return -EOPNOTSUPP; }
+static inline int btrtl_shutdown_realtek(struct hci_dev *hdev) +{ + return -EOPNOTSUPP; +} + static inline int btrtl_get_uart_settings(struct hci_dev *hdev, struct btrtl_device_info *btrtl_dev, unsigned int *controller_baudrate, diff --git a/drivers/bluetooth/btusb.c b/drivers/bluetooth/btusb.c index 7954a79249235..0f4750322864a 100644 --- a/drivers/bluetooth/btusb.c +++ b/drivers/bluetooth/btusb.c @@ -3181,6 +3181,7 @@ static int btusb_probe(struct usb_interface *intf, #ifdef CONFIG_BT_HCIBTUSB_RTL if (id->driver_info & BTUSB_REALTEK) { hdev->setup = btrtl_setup_realtek; + hdev->shutdown = btrtl_shutdown_realtek;
/* Realtek devices lose their updated firmware over suspend, * but the USB hub doesn't notice any status change.