Attention is currently required from: Eran Mitrani, Jakub Czapiga, Jérémy Compostella, Lance Zhao, Paul Menzel, Sukumar Ghorai, Tarun, Tim Wawrzynczak.
Hello Eran Mitrani, Jakub Czapiga, Jérémy Compostella, Kapil Porwal, Lance Zhao, Paul Menzel, Subrata Banik, Tarun, Tim Wawrzynczak, build bot (Jenkins),
I'd like you to reexamine a change. Please visit
https://review.coreboot.org/c/coreboot/+/78164?usp=email
to look at the new patch set (#17).
Change subject: acpi: Configure slp-s0 residency counter frequency in LPIT table ......................................................................
acpi: Configure slp-s0 residency counter frequency in LPIT table
Intel platforms use Low Power Idle Table (LPIT) to enumerate platform Low Power Idle states. There are two types of low power residencies a) CPU PKG C10 - read via MSR (Function fixed hardware interface) b) Platform Controller Hub (PCH) SLP_S0 - read via memory mapped Ref. https://www.uefi.org/sites/default/files/resources/Intel_ACPI_Low_Power_S0_I...
System sleep time (SLP_S0 signal asserted) is measured in ticks, varies in every platform and based on PMC clock.
BUG=b:300440936 TEST=check kernel cpuidle sysfs for non-zero residency after s0ix cycle and both must match cat /sys/devices/system/cpu/cpuidle/low_power_idle_system_residency_us cat /sys/kernel/debug/pmc_core/slp_s0_residency_usec
Change-Id: I401dd4a09a67d81a9ea3a56cd22f1a681e2a9349 Signed-off-by: Sukumar Ghorai sukumar.ghorai@intel.com --- M src/include/acpi/acpi.h 1 file changed, 6 insertions(+), 1 deletion(-)
git pull ssh://review.coreboot.org:29418/coreboot refs/changes/64/78164/17