darp8: `PLTRST#` virtual wire not de-asserted on S3 resume

[crawfxrd]

• Model: darp8
• BIOS version: 2024-01-10_6c402c3
• EC version: 2024-01-10_6c402c3
• OS:
• Kernel:

The last batch of darp8 do not de-assert the PLTRST# virtual wire on S3 resume, causing the system to hang on wake.

Steps to reproduce

• Switch to S3 suspend: echo deep | sudo tee /sys/power/mem_sleep
• Suspend the system: sudo systemctl suspend
• Wake the system: Press the power button

Expected behavior

System resumes to desktop.

Actual behavior

System hangs with solid green LED and black screen.

Additional info

This is seemingly an unidentified BOM change from Clevo, as the engineering units we originally received and first batch of production units that customers received (which also had an unidentified change that broke on our firmware) do not have the issue.

Ref: #469