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path: root/include/dt-bindings/power/r8a7790-sysc.h
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/*
 * Copyright (C) 2016 Glider bvba
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; version 2 of the License.
 */
#ifndef __DT_BINDINGS_POWER_R8A7790_SYSC_H__
#define __DT_BINDINGS_POWER_R8A7790_SYSC_H__

/*
 * These power domain indices match the numbers of the interrupt bits
 * representing the power areas in the various Interrupt Registers
 * (e.g. SYSCISR, Interrupt Status Register)
 */

#define R8A7790_PD_CA15_CPU0		 0
#define R8A7790_PD_CA15_CPU1		 1
#define R8A7790_PD_CA15_CPU2		 2
#define R8A7790_PD_CA15_CPU3		 3
#define R8A7790_PD_CA7_CPU0		 5
#define R8A7790_PD_CA7_CPU1		 6
#define R8A7790_PD_CA7_CPU2		 7
#define R8A7790_PD_CA7_CPU3		 8
#define R8A7790_PD_CA15_SCU		12
#define R8A7790_PD_SH_4A		16
#define R8A7790_PD_RGX			20
#define R8A7790_PD_CA7_SCU		21
#define R8A7790_PD_IMP			24

/* Always-on power area */
#define R8A7790_PD_ALWAYS_ON		32

#endif /* __DT_BINDINGS_POWER_R8A7790_SYSC_H__ */
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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>
Diffstat (limited to 'include/dt-bindings/thermal')