From: bugzilla-daemon@kernel.org
To: linux-usb@vger.kernel.org
Subject: [Bug 221716] New: JHL9580 Barlow Ridge TB5: host_reset timeout, PCIe tunneling broken
Date: Fri, 03 Jul 2026 04:00:35 +0000 [thread overview]
Message-ID: <bug-221716-208809@https.bugzilla.kernel.org/> (raw)
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: drivers_usb@kernel-bugs.kernel.org
Reporter: liqysir@qq.com
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 linux-usb@vger.kernel.org.
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