Bluetooth: hci_h5: Turn off RTL8723BS on suspend, reprobe on resume

On many devices the RTL8723BS device gets reset during suspend/resume,
causing it to lose its firmware and all state.

Testing has shown it drops back to communicating at 115200 bps and sends
sync-request packages, indicating it has been fully reset.

This commit fixes this by queueing a reprobe on resume.

This mirrors how USB RTL BT devices, which have the same problem, are
handled in the btusb driver, there we set the USB_QUIRK_RESET_RESUME for
all RTL devices, which also causes a reprobe on resume. The only difference
is that here we need to do the reprobe ourselves.

Since we are doing a full reprobe on resume now, we can also turn off the
device on suspend to save power while suspended.

Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>

diff --git a/drivers/bluetooth/hci_h5.c b/drivers/bluetooth/hci_h5.c
index beddb89..069d1c8 100644 (file)
--- a/drivers/bluetooth/hci_h5.c
+++ b/drivers/bluetooth/hci_h5.c
@@ -931,6 +931,56 @@ static void h5_btrtl_close(struct h5 *h5)
        gpiod_set_value_cansleep(h5->enable_gpio, 0);
 }
 
+/* Suspend/resume support. On many devices the RTL BT device loses power during
+ * suspend/resume, causing it to lose its firmware and all state. So we simply
+ * turn it off on suspend and reprobe on resume.  This mirrors how RTL devices
+ * are handled in the USB driver, where the USB_QUIRK_RESET_RESUME is used which
+ * also causes a reprobe on resume.
+ */
+static int h5_btrtl_suspend(struct h5 *h5)
+{
+       serdev_device_set_flow_control(h5->hu->serdev, false);
+       gpiod_set_value_cansleep(h5->device_wake_gpio, 0);
+       gpiod_set_value_cansleep(h5->enable_gpio, 0);
+       return 0;
+}
+
+struct h5_btrtl_reprobe {
+       struct device *dev;
+       struct work_struct work;
+};
+
+static void h5_btrtl_reprobe_worker(struct work_struct *work)
+{
+       struct h5_btrtl_reprobe *reprobe =
+               container_of(work, struct h5_btrtl_reprobe, work);
+       int ret;
+
+       ret = device_reprobe(reprobe->dev);
+       if (ret && ret != -EPROBE_DEFER)
+               dev_err(reprobe->dev, "Reprobe error %d\n", ret);
+
+       put_device(reprobe->dev);
+       kfree(reprobe);
+       module_put(THIS_MODULE);
+}
+
+static int h5_btrtl_resume(struct h5 *h5)
+{
+       struct h5_btrtl_reprobe *reprobe;
+
+       reprobe = kzalloc(sizeof(*reprobe), GFP_KERNEL);
+       if (!reprobe)
+               return -ENOMEM;
+
+       __module_get(THIS_MODULE);
+
+       INIT_WORK(&reprobe->work, h5_btrtl_reprobe_worker);
+       reprobe->dev = get_device(&h5->hu->serdev->dev);
+       queue_work(system_long_wq, &reprobe->work);
+       return 0;
+}
+
 static const struct acpi_gpio_params btrtl_device_wake_gpios = { 0, 0, false };
 static const struct acpi_gpio_params btrtl_enable_gpios = { 1, 0, false };
 static const struct acpi_gpio_params btrtl_host_wake_gpios = { 2, 0, false };
@@ -945,6 +995,8 @@ static struct h5_vnd rtl_vnd = {
        .setup          = h5_btrtl_setup,
        .open           = h5_btrtl_open,
        .close          = h5_btrtl_close,
+       .suspend        = h5_btrtl_suspend,
+       .resume         = h5_btrtl_resume,
        .acpi_gpio_map  = acpi_btrtl_gpios,
 };
 #endif