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Subject[PATCH] Bluetooth: btusb: Use cmd_timeout to reset Realtek device
From: Alex Lu <alex_lu@realsil.com.cn>

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>
---
drivers/bluetooth/btusb.c | 29 +++++++++++++++++++++--------
1 file changed, 21 insertions(+), 8 deletions(-)

diff --git a/drivers/bluetooth/btusb.c b/drivers/bluetooth/btusb.c
index 31d3febed187..a626de3a3f4c 100644
--- a/drivers/bluetooth/btusb.c
+++ b/drivers/bluetooth/btusb.c
@@ -489,16 +489,19 @@ struct btusb_data {
int (*setup_on_usb)(struct hci_dev *hdev);

int oob_wake_irq; /* irq for out-of-band wake-on-bt */
- unsigned cmd_timeout_cnt;
+ unsigned int cmd_timeout_cnt;
+ unsigned int cmd_timeout_max;
+ unsigned int reset_msecs;
+ int reset_gpio_value;
};


-static void btusb_intel_cmd_timeout(struct hci_dev *hdev)
+static void btusb_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)
+ if (++data->cmd_timeout_cnt < data->cmd_timeout_max)
return;

if (!reset_gpio) {
@@ -519,9 +522,9 @@ static void btusb_intel_cmd_timeout(struct hci_dev *hdev)
}

bt_dev_err(hdev, "Initiating HW reset via gpio");
- gpiod_set_value_cansleep(reset_gpio, 1);
- msleep(100);
- gpiod_set_value_cansleep(reset_gpio, 0);
+ gpiod_set_value_cansleep(reset_gpio, data->reset_gpio_value);
+ msleep(data->reset_msecs);
+ gpiod_set_value_cansleep(reset_gpio, !data->reset_gpio_value);
}

static inline void btusb_free_frags(struct btusb_data *data)
@@ -3723,7 +3726,10 @@ static int btusb_probe(struct usb_interface *intf,
hdev->shutdown = btusb_shutdown_intel;
hdev->set_diag = btintel_set_diag_mfg;
hdev->set_bdaddr = btintel_set_bdaddr;
- hdev->cmd_timeout = btusb_intel_cmd_timeout;
+ hdev->cmd_timeout = btusb_cmd_timeout;
+ data->cmd_timeout_max = 5;
+ data->reset_msecs = 100;
+ data->reset_gpio_value = 1;
set_bit(HCI_QUIRK_STRICT_DUPLICATE_FILTER, &hdev->quirks);
set_bit(HCI_QUIRK_SIMULTANEOUS_DISCOVERY, &hdev->quirks);
set_bit(HCI_QUIRK_NON_PERSISTENT_DIAG, &hdev->quirks);
@@ -3737,7 +3743,10 @@ static int btusb_probe(struct usb_interface *intf,
hdev->hw_error = btintel_hw_error;
hdev->set_diag = btintel_set_diag;
hdev->set_bdaddr = btintel_set_bdaddr;
- hdev->cmd_timeout = btusb_intel_cmd_timeout;
+ hdev->cmd_timeout = btusb_cmd_timeout;
+ data->cmd_timeout_max = 5;
+ data->reset_msecs = 100;
+ data->reset_gpio_value = 1;
set_bit(HCI_QUIRK_STRICT_DUPLICATE_FILTER, &hdev->quirks);
set_bit(HCI_QUIRK_SIMULTANEOUS_DISCOVERY, &hdev->quirks);
set_bit(HCI_QUIRK_NON_PERSISTENT_DIAG, &hdev->quirks);
@@ -3783,6 +3792,10 @@ 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_cmd_timeout;
+ data->cmd_timeout_max = 5;
+ data->reset_msecs = 200;
+ data->reset_gpio_value = 0;

/* Realtek devices lose their updated firmware over global
* suspend that means host doesn't send SET_FEATURE
--
2.21.0
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