linux-kernel - [PATCH] Bluetooth: btbcm: Fix reset errors at setup

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Message-ID: <20250213070520.9308-4-tatsuya.s2862@gmail.com>
Date: Thu, 13 Feb 2025 16:05:22 +0900
From: Tatsuya S <tatsuya.s2862@...il.com>
To: Marcel Holtmann <marcel@...tmann.org>,
	Luiz Augusto von Dentz <luiz.dentz@...il.com>
Cc: Tatsuya S <tatsuya.s2862@...il.com>,
	linux-bluetooth@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH] Bluetooth: btbcm: Fix reset errors at setup

After the Bluetooth USB controller is connected, error may occur
on the first reset HCI command.

[    5.678408] Bluetooth: hci0: command 0x0c03 tx timeout
[    5.678435] Bluetooth: hci0: BCM: Reset failed (-110)
[   18.030627] usb 1-8: Failed to suspend device, error -110

To reduce this error, insert a little sleep for warmup.

Signed-off-by: Tatsuya S <tatsuya.s2862@...il.com>
---
 drivers/bluetooth/btbcm.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/bluetooth/btbcm.c b/drivers/bluetooth/btbcm.c
index 0a60660fc8ce..026d8571adf5 100644
--- a/drivers/bluetooth/btbcm.c
+++ b/drivers/bluetooth/btbcm.c
@@ -733,6 +733,9 @@ int btbcm_setup_apple(struct hci_dev *hdev)
 	struct sk_buff *skb;
 	int err;
 
+	/* Waiting for hardware warmup */
+	msleep(200);
+
 	/* Reset */
 	err = btbcm_reset(hdev);
 	if (err)
-- 
2.48.1