>>> Only remaining option is to use coreboot's ssdt generator.
>>
>> Or test _STA method proper.
>
> _STA is against the ACPI spec in case of PCI device. i don't
> understand whats the point of pushing in that line ?

Because I couldn't find anything in ACPI spec telling that. Can
you point me to the specific paragraph, please?

I thought you read entire gerrit discussion's for this CL.

I have replied the same in Jan 10th that.

src/soc/intel/cannonlake/acpi/scs.asl
Line 30:
. For _HID devices, OSPM evaluates the _STA method. For _ADR devices, OSPM checks with the bus driver for that
device

https://www.uefi.org/sites/default/files/resources/ACPI_6.0.pdf
section 6.3.3

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