[SRU][Xenial][PATCH 1/1] Revert "Bluetooth: btusb: fix QCA Rome suspend/resume"

[Joseph Salisbury]

From: Kai-Heng Feng <kai.heng.feng at canonical.com>

BugLink: http://bugs.launchpad.net/bugs/1759821

This reverts commit fd865802c66bc451dc515ed89360f84376ce1a56.

This commit causes a regression on some QCA ROME chips. The USB device
reset happens in btusb_open(), hence firmware loading gets interrupted.

Furthermore, this commit stops working after commit
("a0085f2510e8976614ad8f766b209448b385492f Bluetooth: btusb: driver to
enable the usb-wakeup feature"). Reset-resume quirk only gets enabled in
btusb_suspend() when it's not a wakeup source.

If we really want to reset the USB device, we need to do it before
btusb_open(). Let's handle it in drivers/usb/core/quirks.c.

Cc: stable at vger.kernel.org
Cc: Leif Liddy <leif.linux at gmail.com>
Cc: Matthias Kaehlcke <mka at chromium.org>
Cc: Brian Norris <briannorris at chromium.org>
Cc: Daniel Drake <drake at endlessm.com>
Signed-off-by: Kai-Heng Feng <kai.heng.feng at canonical.com>
Reviewed-by: Brian Norris <briannorris at chromium.org>
Tested-by: Brian Norris <briannorris at chromium.org>
Signed-off-by: Marcel Holtmann <marcel at holtmann.org>
(cherry picked from commit 7d06d5895c159f64c46560dc258e553ad8670fe0)
Signed-off-by: Joseph Salisbury <joseph.salisbury at canonical.com>
---
 drivers/bluetooth/btusb.c | 6 ------
 1 file changed, 6 deletions(-)

diff --git a/drivers/bluetooth/btusb.c b/drivers/bluetooth/btusb.c
index 7c076cf..4346223 100644
--- a/drivers/bluetooth/btusb.c
+++ b/drivers/bluetooth/btusb.c
@@ -2989,12 +2989,6 @@ 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
-- 
2.7.4