# # UWB device configuration # menuconfig UWB tristate "Ultra Wideband devices" default n help UWB is a high-bandwidth, low-power, point-to-point radio technology using a wide spectrum (3.1-10.6GHz). It is optimized for in-room use (480Mbps at 2 meters, 110Mbps at 10m). It serves as the transport layer for other protocols, such as Wireless USB (WUSB). The topology is peer to peer; however, higher level protocols (such as WUSB) might impose a master/slave relationship. Say Y here if your computer has UWB radio controllers (USB or PCI) based. You will need to enable the radio controllers below. It is ok to select all of them, no harm done. For more help check the UWB and WUSB related files in . To compile the UWB stack as a module, choose M here. if UWB config UWB_HWA tristate "UWB Radio Control driver for WUSB-compliant USB dongles (HWA)" depends on USB help This driver enables the radio controller for HWA USB devices. HWA stands for Host Wire Adapter, and it is a UWB Radio Controller connected to your system via USB. Most of them come with a Wireless USB host controller also. To compile this driver select Y (built in) or M (module). It is safe to select any even if you do not have the hardware. config UWB_WHCI tristate "UWB Radio Control driver for WHCI-compliant cards" depends on PCI help This driver enables the radio controller for WHCI cards. WHCI is a specification developed by Intel (http://www.intel.com/technology/comms/wusb/whci.htm) much in the spirit of USB's EHCI, but for UWB and Wireless USB radio/host controllers connected via memory mapping (eg: PCI). Most of these cards come also with a Wireless USB host controller. To compile this driver select Y (built in) or M (module). It is safe to select any even if you do not have the hardware. config UWB_I1480U tristate "Support for Intel Wireless UWB Link 1480 HWA" depends on UWB_HWA select FW_LOADER help This driver enables support for the i1480 when connected via USB. It consists of a firmware uploader that will enable it to behave as an HWA device. To compile this driver select Y (built in) or M (module). It is safe to select any even if you do not have the hardware. endif # UWB 22efa1db9f6e71b24440b5f1d93e968ee3'/>
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authorSrinivas Pandruvada <srinivas.pandruvada@linux.intel.com>2017-02-03 14:18:39 -0800
committerRafael J. Wysocki <rafael.j.wysocki@intel.com>2017-02-04 00:11:08 +0100
commit6e978b22efa1db9f6e71b24440b5f1d93e968ee3 (patch)
treec666f7a26b860674848949e39a610222b0723f89 /net/strparser
parent3c223c19aea85d3dda1416c187915f4a30b04b1f (diff)
cpufreq: intel_pstate: Disable energy efficiency optimization
Some Kabylake desktop processors may not reach max turbo when running in HWP mode, even if running under sustained 100% utilization. This occurs when the HWP.EPP (Energy Performance Preference) is set to "balance_power" (0x80) -- the default on most systems. It occurs because the platform BIOS may erroneously enable an energy-efficiency setting -- MSR_IA32_POWER_CTL BIT-EE, which is not recommended to be enabled on this SKU. On the failing systems, this BIOS issue was not discovered when the desktop motherboard was tested with Windows, because the BIOS also neglects to provide the ACPI/CPPC table, that Windows requires to enable HWP, and so Windows runs in legacy P-state mode, where this setting has no effect. Linux' intel_pstate driver does not require ACPI/CPPC to enable HWP, and so it runs in HWP mode, exposing this incorrect BIOS configuration. There are several ways to address this problem. First, Linux can also run in legacy P-state mode on this system. As intel_pstate is how Linux enables HWP, booting with "intel_pstate=disable" will run in acpi-cpufreq/ondemand legacy p-state mode. Or second, the "performance" governor can be used with intel_pstate, which will modify HWP.EPP to 0. Or third, starting in 4.10, the /sys/devices/system/cpu/cpufreq/policy*/energy_performance_preference attribute in can be updated from "balance_power" to "performance". Or fourth, apply this patch, which fixes the erroneous setting of MSR_IA32_POWER_CTL BIT_EE on this model, allowing the default configuration to function as designed. Signed-off-by: Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com> Reviewed-by: Len Brown <len.brown@intel.com> Cc: 4.6+ <stable@vger.kernel.org> # 4.6+ Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
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