diff options
| author | Vyacheslav Bocharov <adeep@lexina.in> | 2022-01-26 10:39:05 +0300 |
|---|---|---|
| committer | Marcel Holtmann <marcel@holtmann.org> | 2022-01-26 14:39:35 +0100 |
| commit | adce573b927adf827f2f8627f05c2ba90031ebc9 (patch) | |
| tree | f57f7cd60c8ac88e1b186d1cabddde1b8a259e30 /drivers/bluetooth | |
| parent | b050c5bbbccfb9e6cbf29c8ee7a41c1bba972bdf (diff) | |
| download | linux-adce573b927adf827f2f8627f05c2ba90031ebc9.tar.bz2 | |
Bluetooth: hci_h5: Add power reset via gpio in h5_btrtl_open
Add power reset for bluetooth via enable-gpios in h5_btrtl_open function.
While testing the RTL8822CS SDIO WiFi/BT adapter, it was found that in
some cases the kernel could not initialize BT firmware. However,
manually resetting the adapter via gpio (off/on sequence) allows it to
start correctly.
Apparently, when the system starts, the adapter is in an undefined state
(including unknown gpio state after starting uboot). A forced reset helps
to initialize the adapter in most cases. It has been found experimentally
that 100 ms is sufficient for a reset.
Signed-off-by: Vyacheslav Bocharov <adeep@lexina.in>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
Diffstat (limited to 'drivers/bluetooth')
| -rw-r--r-- | drivers/bluetooth/hci_h5.c | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/drivers/bluetooth/hci_h5.c b/drivers/bluetooth/hci_h5.c index 34286ffe0568..fdf504b0d265 100644 --- a/drivers/bluetooth/hci_h5.c +++ b/drivers/bluetooth/hci_h5.c @@ -966,6 +966,11 @@ static void h5_btrtl_open(struct h5 *h5) pm_runtime_enable(&h5->hu->serdev->dev); } + /* The controller needs reset to startup */ + gpiod_set_value_cansleep(h5->enable_gpio, 0); + gpiod_set_value_cansleep(h5->device_wake_gpio, 0); + msleep(100); + /* The controller needs up to 500ms to wakeup */ gpiod_set_value_cansleep(h5->enable_gpio, 1); gpiod_set_value_cansleep(h5->device_wake_gpio, 1); |