diff options
| author | Alex Lu <alex_lu@realsil.com.cn> | 2019-09-05 10:36:31 +0800 |
|---|---|---|
| committer | Marcel Holtmann <marcel@holtmann.org> | 2019-09-05 17:32:28 +0200 |
| commit | d7ef0d1e39685b38c97b30daa6de0d50df004839 (patch) | |
| tree | efdd5eb7b540451fd025b27b9c27ab4f0ee12ef9 | |
| parent | cf0d9a705d81a0f581865cefe0880f29589dd06f (diff) | |
| download | linux-d7ef0d1e39685b38c97b30daa6de0d50df004839.tar.bz2 | |
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: Alex Lu <alex_lu@realsil.com.cn>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
| -rw-r--r-- | drivers/bluetooth/btusb.c | 31 |
1 files changed, 31 insertions, 0 deletions
diff --git a/drivers/bluetooth/btusb.c b/drivers/bluetooth/btusb.c index 31d3febed187..ed455de598ea 100644 --- a/drivers/bluetooth/btusb.c +++ b/drivers/bluetooth/btusb.c @@ -524,6 +524,36 @@ static void btusb_intel_cmd_timeout(struct hci_dev *hdev) 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) { unsigned long flags; @@ -3783,6 +3813,7 @@ static int btusb_probe(struct usb_interface *intf, if (id->driver_info & BTUSB_REALTEK) { hdev->setup = btrtl_setup_realtek; hdev->shutdown = btrtl_shutdown_realtek; + hdev->cmd_timeout = btusb_rtl_cmd_timeout; /* Realtek devices lose their updated firmware over global * suspend that means host doesn't send SET_FEATURE |