config SND_SOC_QCOM
tristate "ASoC support for QCOM platforms"
depends on ARCH_QCOM || COMPILE_TEST
help
Say Y or M if you want to add support to use audio devices
in Qualcomm Technologies SOC-based platforms.
config SND_SOC_LPASS_CPU
tristate
select REGMAP_MMIO
config SND_SOC_LPASS_PLATFORM
tristate
depends on HAS_DMA
select REGMAP_MMIO
config SND_SOC_LPASS_IPQ806X
tristate
depends on HAS_DMA
select SND_SOC_LPASS_CPU
select SND_SOC_LPASS_PLATFORM
config SND_SOC_LPASS_APQ8016
tristate
depends on HAS_DMA
select SND_SOC_LPASS_CPU
select SND_SOC_LPASS_PLATFORM
config SND_SOC_STORM
tristate "ASoC I2S support for Storm boards"
depends on SND_SOC_QCOM && HAS_DMA
select SND_SOC_LPASS_IPQ806X
select SND_SOC_MAX98357A
help
Say Y or M if you want add support for SoC audio on the
Qualcomm Technologies IPQ806X-based Storm board.
config SND_SOC_APQ8016_SBC
tristate "SoC Audio support for APQ8016 SBC platforms"
depends on SND_SOC_QCOM && HAS_DMA
select SND_SOC_LPASS_APQ8016
help
Support for Qualcomm Technologies LPASS audio block in
APQ8016 SOC-based systems.
Say Y if you want to use audio devices on MI2S.
-loop-back'>packet-loop-back
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>