diff options
Diffstat (limited to '0001-Bluetooth-btusb-Add-a-Kconfig-option-to-enable-USB-a.patch')
| -rw-r--r-- | 0001-Bluetooth-btusb-Add-a-Kconfig-option-to-enable-USB-a.patch | 90 |
1 files changed, 90 insertions, 0 deletions
diff --git a/0001-Bluetooth-btusb-Add-a-Kconfig-option-to-enable-USB-a.patch b/0001-Bluetooth-btusb-Add-a-Kconfig-option-to-enable-USB-a.patch new file mode 100644 index 000000000..1f94c3d70 --- /dev/null +++ b/0001-Bluetooth-btusb-Add-a-Kconfig-option-to-enable-USB-a.patch @@ -0,0 +1,90 @@ +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 + |