Aymeric Wibo
c5daa5a4c3
Add SPMC (system power management controller) driver as acpi_spmc. This is the device which provides the LPI device D-state constraints and allows for OSPM to send S0ix/modern standby entry/exit notifications. This supports the original Intel DSM (https://uefi.org/sites/default/files/resources/Intel_ACPI_Low_Power_S0_Idle.pdf, untested), the AMD DSM (tested), and the Microsoft DSM (tested). Before entry, acpi_spmc_check_constraints is called to notify of any violated power constraints. This will use acpi_pwr_get_state to get current device D-states when that gets added back. Reviewed by: olce Tested by: jkim, Oleksandr Kryvulia, Matthias Lanter Approved by: olce Sponsored by: The FreeBSD Foundation Differential Revision: https://reviews.freebsd.org/D48387
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