tbt: Support Barlow Ridge

[crawfxrd]

Barlow Ridge does not support Firmware Connection Manager (FCM/FWCM). Add support for and use Software Connection Manager (SCM/SWCM).

Barlow Ridge BIOS Implementation Guide r0.9 (#782921) has the following notes:

• 4 USBC Configuration Requirements
  • 4.3.1 Overview

In addition, BR only supports SW CM due to the hardware constraint (no arc. logic design)

• 5 USB4 Software Connection Manager
  • 5.1.3.1 BIOS and TBT FW Handshake

Barlow Ridge TBT FW does not support FW CM mode.

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• coreboot
  • Select SOFTWARE_CONNECTION_MANAGER for boards using SOC_INTEL_ENABLE_USB4_PCIE_RESOURCES
  • Update dTBT driver to support SCM
  • Update dTBT driver to support Barlow Ridge
• linux
  • Revert pop-os/linux@0470d83

[crawfxrd]

Barlow Ridge BIOS Implementation Guide r1.1 (2024-07-16) now states that FW CM is supported.

• 5 USB4 Software Connection Manager

The CM in the USB4 host system can be firmware base connection manager (FW CM)
just like Thunderbolt 3 generation to support any BIOS or OS that doesn’t support
USB4 software connection manager (SW CM) for backward compatible; or can be SW
CM base when BIOS or OS support that feature.

But attempting to use the commands to enable FW CM timeout.