New: JHL9580 Barlow Ridge TB5: host_reset timeout, PCIe tunneling broken

https://bugzilla.kernel.org/show_bug.cgi?id=221716

            Bug ID: 221716
           Summary: JHL9580 Barlow Ridge TB5: host_reset timeout, PCIe
                    tunneling broken
           Product: Drivers
           Version: 2.5
          Hardware: All
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P3
         Component: USB
          Assignee: [email protected]
          Reporter: [email protected]
        Regression: No

JHL9580 Barlow Ridge (8086:5780/5781) Thunderbolt 5 / USB4 v2 host
controller has incomplete Linux support through v7.2-rc1.

Symptoms:
- host_reset times out (REG_RESET HRR stays 0x01, even with 5000ms timeout)
- REG_FW_STS is read-only (0x00000000), ICM firmware cannot start
- USB3 tunneling works (XHCI pass-through), PCIe tunneling broken
- eGPU GPU never appears in lspci

Tested: kernel 7.0.0-22, 7.0.0-27, 7.1.2 — all same issue.
Hardware: MSI MS-15M3 (Arrow Lake-HX Ultra 9 275HX) + GIGABYTE AORUS
RTX5090 AI BOX.

Root causes identified:
1. get_upstream_port() in icm.c does not recognize 0x5780
2. icm_probe() has no case for 0x5781
3. icm_firmware_reset() → pcie2cio_write() times out on Barlow Ridge

Patch attempted (adds 0x5780/0x5781 to icm.c) — icm_probe succeeds but CIO reset times out. Correct Barlow Ridge CIO reset sequence needed.

Full diagnosis email sent to [email protected].

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