From: Alex Lu <alex_lu@xxxxxxxxxxxxxx>
>From the perspective of controller, global suspend means there is no
SET_FEATURE (DEVICE_REMOTE_WAKEUP) and controller would drop the
firmware. It would consume less power. So we should not send this kind
of SET_FEATURE when host goes to suspend state.
Otherwise, when making device enter selective suspend, host should send
SET_FEATURE to make sure the firmware remains.
Signed-off-by: Alex Lu <alex_lu@xxxxxxxxxxxxxx>
---
drivers/bluetooth/btusb.c | 34 ++++++++++++++++++++++++++++++----
1 file changed, 30 insertions(+), 4 deletions(-)
diff --git a/drivers/bluetooth/btusb.c b/drivers/bluetooth/btusb.c
index 50aed5259c2b..1995e26fa4cd 100644
--- a/drivers/bluetooth/btusb.c
+++ b/drivers/bluetooth/btusb.c
@@ -426,6 +426,7 @@ static const struct dmi_system_id btusb_needs_reset_resume_table[] = {
#define BTUSB_DIAG_RUNNING 10
#define BTUSB_OOB_WAKE_ENABLED 11
#define BTUSB_HW_RESET_ACTIVE 12
+#define BTUSB_WAKEUP_DISABLE 13
struct btusb_data {
struct hci_dev *hdev;
@@ -1165,6 +1166,13 @@ static int btusb_open(struct hci_dev *hdev)
*/
device_wakeup_enable(&data->udev->dev);
+ /* Disable device remote wakeup when host is suspended
+ * For Realtek chips, global suspend without
+ * SET_FEATURE (DEVICE_REMOTE_WAKEUP) can save more power in device.
+ */
+ if (test_bit(BTUSB_WAKEUP_DISABLE, &data->flags))
+ device_wakeup_disable(&data->udev->dev);
+
if (test_and_set_bit(BTUSB_INTR_RUNNING, &data->flags))
goto done;
@@ -1227,6 +1235,11 @@ static int btusb_close(struct hci_dev *hdev)
goto failed;
data->intf->needs_remote_wakeup = 0;
+
+ /* Enable remote wake up for auto-suspend */
+ if (test_bit(BTUSB_WAKEUP_DISABLE, &data->flags))
+ data->intf->needs_remote_wakeup = 1;
+
device_wakeup_disable(&data->udev->dev);
usb_autopm_put_interface(data->intf);
@@ -3185,11 +3198,11 @@ static int btusb_probe(struct usb_interface *intf,
if (id->driver_info & BTUSB_REALTEK) {
hdev->setup = btrtl_setup_realtek;
- /* Realtek devices lose their updated firmware over suspend,
- * but the USB hub doesn't notice any status change.
- * Explicitly request a device reset on resume.
+ /* Realtek devices lose their updated firmware over global
+ * suspend that means host doesn't send SET_FEATURE
+ * (DEVICE_REMOTE_WAKEUP)
*/
- interface_to_usbdev(intf)->quirks |= USB_QUIRK_RESET_RESUME;
+ set_bit(BTUSB_WAKEUP_DISABLE, &data->flags);
}
#endif
@@ -3363,6 +3376,19 @@ static int btusb_suspend(struct usb_interface *intf, pm_message_t message)
enable_irq(data->oob_wake_irq);
}
+ /* For global suspend, Realtek devices lose the loaded fw
+ * in them. But for autosuspend, firmware should remain.
+ * Actually, it depends on whether the usb host sends
+ * set feature (enable wakeup) or not.
+ */
+ if (test_bit(BTUSB_WAKEUP_DISABLE, &data->flags)) {
+ if (PMSG_IS_AUTO(message) &&
+ device_can_wakeup(&data->udev->dev))
+ data->udev->do_remote_wakeup = 1;
+ else if (!PMSG_IS_AUTO(message))
+ data->udev->reset_resume = 1;
+ }
+
return 0;
}
--
2.19.2
