Problems have been reported on AMD laptops with suspend/resume where particular root ports are put into D3 and then the system is unable to resume properly. The issue boils down to the currently selected kernel policy for root port behavior at suspend time: 0) If the machine is from 2015 or later 1) If a PCIe root port is power manageable by the platform then platform will be used to determine the power state of the root port at suspend. 2) If the PCIe root is not power manageable by the platform then the kernel will check if it was configured to wakeup. 3) If it was, then it will be put into the deepest state that supports wakeup from PME. 4) If it wasn't, then it will be put into D3hot. This patch adjusts it so that device constraints for low power idle are considered if the device is not power manageable by the platform. Mario Limonciello (7): ACPI: Add comments to clarify some #ifdef statements ACPI: Adjust #ifdef for *_lps0_dev use ACPI: x86: s2idle: Fix a logic error parsing AMD constraints table ACPI: x86: s2idle: Add more debugging for AMD constraints parsing ACPI: x86: s2idle: Store if constraint is enabled ACPI: x86: s2idle: Add a function to get constraints for a device PCI: Use device constraints to decide PCI target state fallback policy drivers/acpi/x86/s2idle.c | 75 ++++++++++++++++++++++++++++----------- drivers/pci/pci.c | 15 ++++++++ include/linux/acpi.h | 14 +++++--- 3 files changed, 79 insertions(+), 25 deletions(-) -- 2.34.1
