Bluetooth: btusb: fix QCA Rome suspend/resume

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@gmail.com>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
Cc: Kai Heng Feng <kai.heng.feng@canonical.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/bluetooth/btusb.c b/drivers/bluetooth/btusb.c
index 74e677a..6930286 100644 (file)
--- a/drivers/bluetooth/btusb.c
+++ b/drivers/bluetooth/btusb.c
@@ -2925,6 +2925,12 @@ static int btusb_probe(struct usb_interface *intf,
        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