[PATCH 4.9 04/72] Bluetooth: btusb: fix QCA Rome suspend/resume

[Greg Kroah-Hartman]

4.9-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Leif Liddy <leif.linux@xxxxxxxxx>

commit fd865802c66bc451dc515ed89360f84376ce1a56 upstream.

There's been numerous reported instances where BTUSB_QCA_ROME
bluetooth controllers stop functioning upon resume from suspend. These
devices seem to be losing power during suspend. Patch will detect a status
change on resume and perform a reset.

Signed-off-by: Leif Liddy <leif.linux@xxxxxxxxx>
Signed-off-by: Marcel Holtmann <marcel@xxxxxxxxxxxx>
Cc: Kai Heng Feng <kai.heng.feng@xxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>

---
 drivers/bluetooth/btusb.c |    6 ++++++
 1 file changed, 6 insertions(+)

--- a/drivers/bluetooth/btusb.c
+++ b/drivers/bluetooth/btusb.c
@@ -2925,6 +2925,12 @@ static int btusb_probe(struct usb_interf
 	if (id->driver_info & BTUSB_QCA_ROME) {
 		data->setup_on_usb = btusb_setup_qca;
 		hdev->set_bdaddr = btusb_set_bdaddr_ath3012;
+
+		/* QCA Rome devices lose their updated firmware over suspend,
+		 * but the USB hub doesn't notice any status change.
+		 * Explicitly request a device reset on resume.
+		 */
+		set_bit(BTUSB_RESET_RESUME, &data->flags);
 	}
 
 #ifdef CONFIG_BT_HCIBTUSB_RTL