linux-kernel - [PATCH v2] Bluetooth: btrtl: HCI reset on close for Realtek BT chip

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Date:   Mon, 24 Jun 2019 14:21:16 +0800
From:   Jian-Hong Pan <jian-hong@...lessm.com>
To:     Daniel Drake <drake@...lessm.com>,
        Johan Hedberg <johan.hedberg@...il.com>,
        Marcel Holtmann <marcel@...tmann.org>
Cc:     linux-bluetooth@...r.kernel.org, linux-kernel@...r.kernel.org,
        Jian-Hong Pan <jian-hong@...lessm.com>
Subject: [PATCH v2] Bluetooth: btrtl: HCI reset on close for Realtek BT chip

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.

bluetoothd[1576]: Failed to set mode: Failed (0x03)

If BT is tunred 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.

Signed-off-by: Jian-Hong Pan <jian-hong@...lessm.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.

 drivers/bluetooth/btrtl.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/bluetooth/btrtl.c b/drivers/bluetooth/btrtl.c
index 208feef63de4..be6d5f7e1e44 100644
--- a/drivers/bluetooth/btrtl.c
+++ b/drivers/bluetooth/btrtl.c
@@ -630,6 +630,10 @@ int btrtl_setup_realtek(struct hci_dev *hdev)
 		return PTR_ERR(btrtl_dev);
 
 	ret = btrtl_download_firmware(hdev, btrtl_dev);
+	/* According to the vendor driver, BT must be reset on close to avoid
+	 * firmware crash since kernel v3.7.1.
+	 */
+	set_bit(HCI_QUIRK_RESET_ON_CLOSE, &hdev->quirks);
 
 	btrtl_free(btrtl_dev);
 
-- 
2.22.0