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authorAlex Lu <alex_lu@realsil.com.cn>2019-09-05 10:36:31 +0800
committerMarcel Holtmann <marcel@holtmann.org>2019-09-05 17:32:28 +0200
commitd7ef0d1e39685b38c97b30daa6de0d50df004839 (patch)
treeefdd5eb7b540451fd025b27b9c27ab4f0ee12ef9
parentcf0d9a705d81a0f581865cefe0880f29589dd06f (diff)
downloadlinux-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.c31
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