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From 20eeb02a0a489e35de0830b2d61f09d43763c982 Mon Sep 17 00:00:00 2001
From: Hans de Goede <hdegoede@redhat.com>
Date: Mon, 13 Nov 2017 09:23:19 +0100
Subject: [PATCH] Bluetooth: btusb: Add a Kconfig option to enable USB
autosuspend by default
On many laptops the btusb device is the only USB device not having USB
autosuspend enabled, this causes not only the HCI but also the USB
controller to stay awake, together using aprox. 0.4W of power.
Modern ultrabooks idle around 6W (at 50% screen brightness), 3.5W for
Apollo Lake devices. 0.4W is a significant chunk of this (7 / 11%).
The btusb driver already contains code to allow enabling USB autosuspend,
but currently leaves it up to the user / userspace to enable it. This
means that for most people it will not be enabled, leading to an
unnecessarily high power consumption.
Since enabling it is not entirely without risk of regressions, this
commit adds a Kconfig option so that Linux distributions can choose to
enable it by default. This commit also adds a module option so that when
distros receive bugs they can easily ask the user to disable it again
for easy debugging.
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
---
Changes in v2:
-s/BT_USB_AUTOSUSPEND/BT_HCIBTUSB_AUTOSUSPEND/
-s/enable_usb_autosuspend/enable_autosuspend/
---
drivers/bluetooth/Kconfig | 10 ++++++++++
drivers/bluetooth/btusb.c | 7 +++++++
2 files changed, 17 insertions(+)
diff --git a/drivers/bluetooth/Kconfig b/drivers/bluetooth/Kconfig
index 6475f8c0d3b2..20940417d937 100644
--- a/drivers/bluetooth/Kconfig
+++ b/drivers/bluetooth/Kconfig
@@ -30,6 +30,16 @@ config BT_HCIBTUSB
Say Y here to compile support for Bluetooth USB devices into the
kernel or say M to compile it as module (btusb).
+config BT_HCIBTUSB_AUTOSUSPEND
+ bool "Enable USB autosuspend for Bluetooth USB devices by default"
+ depends on BT_HCIBTUSB
+ help
+ Say Y here to enable USB autosuspend for Bluetooth USB devices by
+ default.
+
+ This can be overridden by passing btusb.enable_autosuspend=[y|n]
+ on the kernel commandline.
+
config BT_HCIBTUSB_BCM
bool "Broadcom protocol support"
depends on BT_HCIBTUSB
diff --git a/drivers/bluetooth/btusb.c b/drivers/bluetooth/btusb.c
index c054d7bce490..3386034a44aa 100644
--- a/drivers/bluetooth/btusb.c
+++ b/drivers/bluetooth/btusb.c
@@ -40,6 +40,7 @@
static bool disable_scofix;
static bool force_scofix;
+static bool enable_autosuspend = IS_ENABLED(CONFIG_BT_HCIBTUSB_AUTOSUSPEND);
static bool reset = true;
@@ -3175,6 +3176,9 @@ static int btusb_probe(struct usb_interface *intf,
}
#endif
+ if (enable_autosuspend)
+ usb_enable_autosuspend(data->udev);
+
err = hci_register_dev(hdev);
if (err < 0)
goto out_free_dev;
@@ -3387,6 +3391,9 @@ MODULE_PARM_DESC(disable_scofix, "Disable fixup of wrong SCO buffer size");
module_param(force_scofix, bool, 0644);
MODULE_PARM_DESC(force_scofix, "Force fixup of wrong SCO buffers size");
+module_param(enable_autosuspend, bool, 0644);
+MODULE_PARM_DESC(enable_autosuspend, "Enable USB autosuspend by default");
+
module_param(reset, bool, 0644);
MODULE_PARM_DESC(reset, "Send HCI reset command on initialization");
--
2.14.3
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