4.4-stable review patch. If anyone has any objections, please let me know.
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From: Leif Liddy leif.linux@gmail.com
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
--- drivers/bluetooth/btusb.c | 6 ++++++ 1 file changed, 6 insertions(+)
--- a/drivers/bluetooth/btusb.c +++ b/drivers/bluetooth/btusb.c @@ -2969,6 +2969,12 @@ 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