From 631473adaaef3e2e84999b78be5df000f4b9faf0 Mon Sep 17 00:00:00 2001 From: Mario Limonciello Date: Fri, 25 Feb 2022 13:06:46 -0600 Subject: [PATCH] ACPI: processor idle: Check for architectural support for LPI commit eb087f305919ee8169ad65665610313e74260463 upstream. When `osc_pc_lpi_support_confirmed` is set through `_OSC` and `_LPI` is populated then the cpuidle driver assumes that LPI is fully functional. However currently the kernel only provides architectural support for LPI on ARM. This leads to high power consumption on X86 platforms that otherwise try to enable LPI. So probe whether or not LPI support is implemented before enabling LPI in the kernel. This is done by overloading `acpi_processor_ffh_lpi_probe` to check whether it returns `-EOPNOTSUPP`. It also means that all future implementations of `acpi_processor_ffh_lpi_probe` will need to follow these semantics as well. Reviewed-by: Sudeep Holla Signed-off-by: Mario Limonciello Signed-off-by: Rafael J. Wysocki Signed-off-by: Greg Kroah-Hartman --- drivers/acpi/processor_idle.c | 15 ++++++++++----- 1 file changed, 10 insertions(+), 5 deletions(-) diff --git a/drivers/acpi/processor_idle.c b/drivers/acpi/processor_idle.c index f37fba9..3e369d0 100644 --- a/drivers/acpi/processor_idle.c +++ b/drivers/acpi/processor_idle.c @@ -1075,6 +1075,11 @@ static int flatten_lpi_states(struct acpi_processor *pr, return 0; } +int __weak acpi_processor_ffh_lpi_probe(unsigned int cpu) +{ + return -EOPNOTSUPP; +} + static int acpi_processor_get_lpi_info(struct acpi_processor *pr) { int ret, i; @@ -1083,6 +1088,11 @@ static int acpi_processor_get_lpi_info(struct acpi_processor *pr) struct acpi_device *d = NULL; struct acpi_lpi_states_array info[2], *tmp, *prev, *curr; + /* make sure our architecture has support */ + ret = acpi_processor_ffh_lpi_probe(pr->id); + if (ret == -EOPNOTSUPP) + return ret; + if (!osc_pc_lpi_support_confirmed) return -EOPNOTSUPP; @@ -1134,11 +1144,6 @@ static int acpi_processor_get_lpi_info(struct acpi_processor *pr) return 0; } -int __weak acpi_processor_ffh_lpi_probe(unsigned int cpu) -{ - return -ENODEV; -} - int __weak acpi_processor_ffh_lpi_enter(struct acpi_lpi_state *lpi) { return -ENODEV; -- 2.7.4