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>

path: root/sound/soc/txx9/Kconfig

##
## TXx9 ACLC
##
config SND_SOC_TXX9ACLC
	tristate "SoC Audio for TXx9"
	depends on HAS_TXX9_ACLC && TXX9_DMAC
	help
	  This option enables support for the AC Link Controllers in TXx9 SoC.

config HAS_TXX9_ACLC
	bool

config SND_SOC_TXX9ACLC_AC97
	tristate
	select AC97_BUS
	select SND_AC97_CODEC
	select SND_SOC_AC97_BUS


##
## Boards
##
config SND_SOC_TXX9ACLC_GENERIC
	tristate "Generic TXx9 ACLC sound machine"
	depends on SND_SOC_TXX9ACLC
	select SND_SOC_TXX9ACLC_AC97
	select SND_SOC_AC97_CODEC
	help
	  This is a generic AC97 sound machine for use in TXx9 based systems.