From: Derek Basehore <dbaseh...@chromium.org> This patch set adds support for catching errors when entering freeze on Intel Skylake SoCs. Support for this can be added to newer SoCs in later patches.
Verification is done by waking up the CPU once every X (default 10) seconds to check the residency of S0ix. This can't be verified before attempting to enter S0ix through mwait, so we have to repeatedly verify entry into that state. Successfully entering S0ix is no guarantee that it will be entered on the next attempt, so we have to schedule another check. This has a minimal power impact of <1% of the total system power on our systems. This relies on the recently added patch "platform/x86: Add PMC Driver for Intel Core SoC" Derek Basehore (5): x86: stub out pmc function clockevents: Add timed freeze x86, apic: Add timed freeze support freeze: Add error reporting intel_idle: Add S0ix validation arch/x86/include/asm/pmc_core.h | 6 +- arch/x86/kernel/apic/apic.c | 25 +++++- drivers/acpi/processor_idle.c | 10 ++- drivers/cpuidle/cpuidle.c | 31 +++++-- drivers/idle/intel_idle.c | 185 +++++++++++++++++++++++++++++++++++++--- include/linux/clockchips.h | 10 +++ include/linux/cpuidle.h | 10 ++- include/linux/suspend.h | 10 +++ kernel/power/suspend.c | 11 ++- kernel/time/clockevents.c | 117 +++++++++++++++++++++++++ 10 files changed, 385 insertions(+), 30 deletions(-) -- 2.8.0.rc3.226.g39d4020
