@@ -6,6 +6,8 @@
#include <linux/firmware.h>
#include <linux/usb.h>
#include <linux/iopoll.h>
+#include <linux/of.h>
+#include <linux/of_gpio.h>
#include <linux/unaligned.h>
#include <net/bluetooth/bluetooth.h>
@@ -109,6 +111,59 @@ static void btmtk_coredump_notify(struct hci_dev *hdev, int state)
}
}
+static void btmtk_reset_by_gpio_work(struct work_struct *work)
+{
+ struct btmtk_reset_gpio *reset_gpio_data =
+ container_of(work, struct btmtk_reset_gpio, reset_work.work);
+
+ gpio_direction_output(reset_gpio_data->gpio_number, 1);
+ kfree(reset_gpio_data);
+}
+
+static int btmtk_reset_by_gpio(struct hci_dev *hdev)
+{
+ struct btmtk_data *data = hci_get_priv(hdev);
+ struct btmtk_reset_gpio *reset_gpio_data;
+ struct device_node *node;
+ int reset_gpio_number;
+
+ node = of_find_compatible_node(NULL, NULL, "mediatek,usb-bluetooth");
+ if (node) {
+ reset_gpio_number = of_get_named_gpio(node, "reset-gpios", 0);
+ if (!gpio_is_valid(reset_gpio_number)) {
+ bt_dev_warn(hdev, "invalid reset gpio, use SW reset");
+ return -EINVAL;
+ }
+ } else {
+ bt_dev_warn(hdev, "no reset gpio, use SW reet");
+ return -ENODEV;
+ }
+
+ /* Toggle the hard reset line. The Mediatek 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(BTMTK_HW_RESET_ACTIVE, &data->flags)) {
+ bt_dev_err(hdev, "last reset failed? Not resetting again");
+ return 0;
+ }
+
+ reset_gpio_data = kzalloc(sizeof(*reset_gpio_data), GFP_KERNEL);
+ if (!reset_gpio_data)
+ return -ENOMEM;
+
+ INIT_DELAYED_WORK(&reset_gpio_data->reset_work, btmtk_reset_by_gpio_work);
+ reset_gpio_data->gpio_number = reset_gpio_number;
+
+ gpio_direction_output(reset_gpio_number, 0);
+ schedule_delayed_work(&reset_gpio_data->reset_work, msecs_to_jiffies(200));
+
+ return 0;
+}
+
void btmtk_fw_get_filename(char *buf, size_t size, u32 dev_id, u32 fw_ver,
u32 fw_flavor)
{
@@ -364,6 +419,10 @@ void btmtk_reset_sync(struct hci_dev *hdev)
struct btmtk_data *reset_work = hci_get_priv(hdev);
int err;
+ /*Toggle reset gpio if the platform provieds one*/
+ err = btmtk_reset_by_gpio(hdev);
+ if (!err)
+ return;
hci_dev_lock(hdev);
err = hci_cmd_sync_queue(hdev, reset_work->reset_sync, NULL, NULL);
@@ -179,6 +179,11 @@ struct btmtk_data {
spinlock_t isorxlock;
};
+struct btmtk_reset_gpio {
+ struct delayed_work reset_work;
+ int gpio_number;
+};
+
typedef int (*wmt_cmd_sync_func_t)(struct hci_dev *,
struct btmtk_hci_wmt_params *);
This patch provides some methods btmtk_reset_by_gpio, btmtk_reset_by_gpio_work_for mediatek controller. The pin is configured in dts files, bluetooth is reset by pulling the pin, when an exception or coredump occurs, the above method will be used to reset the bluetooth. Co-developed-by Hao qin <hao.qin@mediatek.com> Co-developed-by Chirs lu <chris.lu@mediatek.com> Co-developed-by Jiande lu <jiande.lu@mediatek.com> Signed-off-by: Zhangchao Zhang <ot_zhangchao.zhang@mediatek.com> --- drivers/bluetooth/btmtk.c | 59 +++++++++++++++++++++++++++++++++++++++ drivers/bluetooth/btmtk.h | 5 ++++ 2 files changed, 64 insertions(+)