From 24ff62ae383f776ab0285f2996de6bd9bb2d2e4b Mon Sep 17 00:00:00 2001
From: "tjiang@codeaurora.org" <tjiang@codeaurora.org>
Date: Thu, 16 Sep 2021 16:41:06 +0800
Subject: [PATCH] Bluetooth: btusb: Add gpio reset way for qca btsoc in cmd_timeout
Git-commit: 24ff62ae383f776ab0285f2996de6bd9bb2d2e4b
Patch-mainline: v5.16-rc1
References: bsc#1193655

if platform provide gpio connect to BT_EN reset pin of qca btsoc chip,
we can do hardware reset instead of usb port reset.

Signed-off-by: Tim Jiang <tjiang@codeaurora.org>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
Acked-by: Takashi Iwai <tiwai@suse.de>

---
 drivers/bluetooth/btusb.c | 22 ++++++++++++++++++++++
 1 file changed, 22 insertions(+)

diff --git a/drivers/bluetooth/btusb.c b/drivers/bluetooth/btusb.c
index 8ef4e0f6e0bb..da85cc14f931 100644
--- a/drivers/bluetooth/btusb.c
+++ b/drivers/bluetooth/btusb.c
@@ -657,11 +657,33 @@ static void btusb_rtl_cmd_timeout(struct hci_dev *hdev)
 static void btusb_qca_cmd_timeout(struct hci_dev *hdev)
 {
 	struct btusb_data *data = hci_get_drvdata(hdev);
+	struct gpio_desc *reset_gpio = data->reset_gpio;
 	int err;
 
 	if (++data->cmd_timeout_cnt < 5)
 		return;
 
+	if (reset_gpio) {
+		bt_dev_err(hdev, "Reset qca device via bt_en gpio");
+
+		/* Toggle the hard reset line. The qca bt device is going to
+		 * yank itself off the USB and then replug. The cleanup is handled
+		 * correctly on the way out (standard USB disconnect), and the new
+		 * device is detected cleanly and bound to the driver again like
+		 * it should be.
+		 */
+		if (test_and_set_bit(BTUSB_HW_RESET_ACTIVE, &data->flags)) {
+			bt_dev_err(hdev, "last reset failed? Not resetting again");
+			return;
+		}
+
+		gpiod_set_value_cansleep(reset_gpio, 0);
+		msleep(200);
+		gpiod_set_value_cansleep(reset_gpio, 1);
+
+		return;
+	}
+
 	bt_dev_err(hdev, "Multiple cmd timeouts seen. Resetting usb device.");
 	/* This is not an unbalanced PM reference since the device will reset */
 	err = usb_autopm_get_interface(data->intf);
-- 
2.31.1