On some AMD platforms the platform _OSC negotiation will lead to `osc_pc_lpi_support_confirmed` being set and because the ACPI tables are populated with `_LPI` entries the kernel will attempt to enable LPI. On non-ARM kernels LPI is not supported and both `acpi_processor_ffh_lpi_probe` and `acpi_processor_ffh_lpi_enter` will return error codes. When this happens there is no recourse though; the cpuidle code does not switch to `_CST` mode, but rather it will continue to behave as though LPI has been enabled and the CPU will remain in a high power state. This patch series shifts the checks around while enabling LPI to detect this situation and let the system continue to set up in _CST mode. Link to v1: https://lore.kernel.org/linux-acpi/20220225031255.3647599-1-mario.limonciello@xxxxxxx/T/#m90282a6e29c334d14b2854a27d7225fc57a22aa6 Mario Limonciello (2): PSCI: cpuidle: Move the `has_lpi` check to the beginning of the function ACPI: processor idle: Check for architectural support for LPI arch/arm64/kernel/cpuidle.c | 6 +++--- drivers/acpi/processor_idle.c | 15 ++++++++++----- 2 files changed, 13 insertions(+), 8 deletions(-) -- 2.34.1
