[coreboot-gerrit] Change in coreboot[master]: soc/intel/tigerlake: Add Method _L73 for USB overcurrent indication

[John Zhao (Code Review)]

John Zhao has posted comments on this change. ( https://review.coreboot.org/c/coreboot/+/47656 )

Change subject: soc/intel/tigerlake: Add Method _L73 for USB overcurrent indication
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Patch Set 1:

(1 comment)

https://review.coreboot.org/c/coreboot/+/47656/1//COMMIT_MSG 
Commit Message:

https://review.coreboot.org/c/coreboot/+/47656/1//COMMIT_MSG@9 
PS1, Line 9: There is a ACPI error message about no handler or method for GPE73 while
           : plugging a USB3 flash driver to a type-C-to-A dongle. The PMC_GPE0_DW2
           : is routed to GPP_E and GPP_E9/USB_OC0# is mapped to GPE73. This change
           : adds a dummy GPE Method _L73 for USB overcurrent indication. Kernel
           : driver suspends the bus and host controller which avoids the host halted
           : in USB overcurrent state.
> This is really strange... I wonder if there's a bug in the kernel. […]

This patch is only intended to address the ACPI error message. Other platforms like Windows has the same dummy _L73 method implementation. 
The observation shows pch xhci is not enumerated as USB2 device when IOM port state is TCCOLD. There is debugging activity for the issue.