Commit d7ef0d1e authored by Alex Lu's avatar Alex Lu Committed by Marcel Holtmann
Browse files

Bluetooth: btusb: Use cmd_timeout to reset Realtek device 



Realtek Bluetooth controller provides a BT_DIS reset pin for hardware
reset of it. The cmd_timeout is helpful on Realtek bluetooth controller
where the firmware gets stuck.

Signed-off-by: default avatarAlex Lu <alex_lu@realsil.com.cn>
Signed-off-by: default avatarMarcel Holtmann <marcel@holtmann.org>
parent cf0d9a70

drivers/bluetooth/btusb.c

+31 −0
Original line number Original line Diff line number Diff line
@@ -524,6 +524,36 @@ static void btusb_intel_cmd_timeout(struct hci_dev *hdev) 
	gpiod_set_value_cansleep(reset_gpio, 0);

	gpiod_set_value_cansleep(reset_gpio, 0);

}

}





static void btusb_rtl_cmd_timeout(struct hci_dev *hdev)

{

	struct btusb_data *data = hci_get_drvdata(hdev);

	struct gpio_desc *reset_gpio = data->reset_gpio;



	if (++data->cmd_timeout_cnt < 5)

		return;



	if (!reset_gpio) {

		bt_dev_err(hdev, "No gpio to reset Realtek device, ignoring");

		return;

	}



	/* Toggle the hard reset line. The Realtek 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;

	}



	bt_dev_err(hdev, "Reset Realtek device via gpio");

	gpiod_set_value_cansleep(reset_gpio, 0);

	msleep(200);

	gpiod_set_value_cansleep(reset_gpio, 1);

}



static inline void btusb_free_frags(struct btusb_data *data)

static inline void btusb_free_frags(struct btusb_data *data)

{

{

	unsigned long flags;

	unsigned long flags;
@@ -3783,6 +3813,7 @@ static int btusb_probe(struct usb_interface *intf, 
	if (id->driver_info & BTUSB_REALTEK) {

	if (id->driver_info & BTUSB_REALTEK) {

		hdev->setup = btrtl_setup_realtek;

		hdev->setup = btrtl_setup_realtek;

		hdev->shutdown = btrtl_shutdown_realtek;

		hdev->shutdown = btrtl_shutdown_realtek;

		hdev->cmd_timeout = btusb_rtl_cmd_timeout;





		/* Realtek devices lose their updated firmware over global

		/* Realtek devices lose their updated firmware over global

		 * suspend that means host doesn't send SET_FEATURE

		 * suspend that means host doesn't send SET_FEATURE

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