linux-kernel - [PATCH AUTOSEL for 4.14 19/60] Bluetooth: avoid silent hci

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Date:   Wed, 13 Dec 2017 01:55:14 +0000
From:   alexander.levin@...izon.com
To:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "stable@...r.kernel.org" <stable@...r.kernel.org>
Cc:     Johan Hovold <johan@...nel.org>,
        Marcel Holtmann <marcel@...tmann.org>,
        alexander.levin@...izon.com
Subject: [PATCH AUTOSEL for 4.14 19/60] Bluetooth: avoid silent hci_bcm ACPI
 PM regression

From: Johan Hovold <johan@...nel.org>

[ Upstream commit 4294625e029028854596865be401b9c5c1f906ef ]

The hci_bcm platform-device hack which was used to implement
power management for ACPI devices is being replaced by a
serial-device-bus implementation.

Unfortunately, when the corresponding change to the ACPI code lands (a
change that will stop enumerating and registering the serial-device-node
child as a platform device) PM will break silently unless serdev
TTY-port controller support has been enabled. Specifically, hciattach
(btattach) would still succeed, but power management would no longer
work.

Although this is strictly a runtime dependency, let's make the driver
depend on SERIAL_DEV_CTRL_TTYPORT, which is the particular serdev
controller implementation used by the ACPI devices currently managed by
this driver, to avoid breaking PM without anyone noticing.

Note that the driver already has a (build-time) dependency on the serdev
bus code.

Signed-off-by: Johan Hovold <johan@...nel.org>
Signed-off-by: Marcel Holtmann <marcel@...tmann.org>
Signed-off-by: Sasha Levin <alexander.levin@...izon.com>
---
 drivers/bluetooth/Kconfig | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/bluetooth/Kconfig b/drivers/bluetooth/Kconfig
index 98a60db8e5d1..369dedf52d5f 100644
--- a/drivers/bluetooth/Kconfig
+++ b/drivers/bluetooth/Kconfig
@@ -170,6 +170,7 @@ config BT_HCIUART_BCM
 	bool "Broadcom protocol support"
 	depends on BT_HCIUART
 	depends on BT_HCIUART_SERDEV
+	depends on (!ACPI || SERIAL_DEV_CTRL_TTYPORT)
 	select BT_HCIUART_H4
 	select BT_BCM
 	help
-- 
2.11.0