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Subject[PATCH v3] Bluetooth: btrtl: HCI reset on close for Realtek BT chip
Date
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>
---
v2:
- According to the vendor driver, it makes "all" Realtek's BT reset on
close. So, this version makes it the same.
- Change to the new subject for all Realtek BT chips.

v3:
- Fix the commit message and add the bug link.
- Have btrtl_shutdown_realtek() which sends HCI reset command and as
the callback function of hdev->shutdown for Realtek BT instead of
setting HCI_QUIRK_RESET_ON_CLOSE flag.

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 208feef63de4..d04b443cad1f 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 f1676144fce8..10ad40c3e42c 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 50aed5259c2b..342e1de6bcba 100644
--- a/drivers/bluetooth/btusb.c
+++ b/drivers/bluetooth/btusb.c
@@ -3184,6 +3184,7 @@ 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.
--
2.22.0
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