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Mon, 5 Oct 2026 21:33:30 GMT (envelope-from bugzilla-noreply@freebsd.org) Received: (from www@localhost) by kenobi.freebsd.org (8.15.2/8.15.2/Submit) id 695LXU21052938 for usb@FreeBSD.org; Mon, 5 Oct 2026 21:33:30 GMT (envelope-from bugzilla-noreply@freebsd.org) X-Authentication-Warning: kenobi.freebsd.org: www set sender to bugzilla-noreply@freebsd.org using -f From: bugzilla-noreply@freebsd.org To: usb@FreeBSD.org Subject: [Bug 299163] xhci: Etron EJ168 requires IOC disabled on Link TRBs Date: Mon, 05 Oct 2026 21:33:30 +0000 X-Bugzilla-Reason: AssignedTo X-Bugzilla-Type: new X-Bugzilla-Watch-Reason: None X-Bugzilla-Product: Base System X-Bugzilla-Component: usb X-Bugzilla-Version: 15.1-RELEASE X-Bugzilla-Keywords: X-Bugzilla-Severity: Affects Some People X-Bugzilla-Who: guy.wyers@gmail.com X-Bugzilla-Status: New X-Bugzilla-Resolution: X-Bugzilla-Priority: --- X-Bugzilla-Assigned-To: usb@FreeBSD.org X-Bugzilla-Flags: X-Bugzilla-Changed-Fields: bug_id short_desc product version rep_platform op_sys bug_status bug_severity priority component assigned_to reporter attachments.created Message-ID: Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="UTF-8" X-Bugzilla-URL: https://bugs.freebsd.org/bugzilla/ Auto-Submitted: auto-generated List-Id: FreeBSD List-Archive: https://lists.freebsd.org/archives/freebsd-usb List-Help: List-Post: List-Subscribe: List-Unsubscribe: X-BeenThere: freebsd-usb@freebsd.org Sender: owner-freebsd-usb@FreeBSD.org List-Id: List-Post: List-Help: List-Subscribe: List-Unsubscribe: List-Owner: Precedence: list MIME-Version: 1.0 https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D299163 Bug ID: 299163 Summary: xhci: Etron EJ168 requires IOC disabled on Link TRBs Product: Base System Version: 15.1-RELEASE Hardware: amd64 OS: Any Status: New Severity: Affects Some People Priority: --- Component: usb Assignee: usb@FreeBSD.org Reporter: guy.wyers@gmail.com Created attachment 275428 --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=3D275428&action= =3Dedit Patch file implementing the fix. The Etron EJ168 USB 3.0 xHCI controller (PCI ID 1b6f:7023) does not reliably operate SuperSpeed devices with the stock FreeBSD 15.1-RELEASE-p3 xhci driver. Test system: - Synology DS412+ R2 - Intel Atom D2701 - Etron EJ168 USB 3.0 controller (1b6f:7023) - FreeBSD 15.1-RELEASE-p3 amd64 - releng/15.1 source at 88e7371d9dc26f85dfc1b008cbe59ebc7e4a33da The EJ168 controller and its root hub initialize at SuperSpeed, but USB 3.0 devices fail during enumeration. Typical errors include: usbd_setup_device_desc: getting device descriptor at addr 1 failed, USB_ERR_IOERROR and: usbd_req_re_enumerate: addr=3D1, set address failed! (USB_ERR_IOERROR, ignored) Devices may subsequently fall back to their USB 2.0 interface and enumerate at HIGH (480Mbps). I instrumented the xHCI driver to trace control transfers, TRBs, Link TRBs, completion events and TD activation. The investigation identified IOC on Link TRBs as the trigger on this controller. First, removing XHCI_TRB_3_IOC_BIT from the Link TRB constructed by xhci_setup_generic_chain_sub() substantially improved operation: an 18-byte Device Descriptor request that previously stalled at the Setup -> Link -> Data boundary completed successfully at SuperSpeed. However, some USB requests still stalled. A second Link TRB is constructed by xhci_transfer_insert() when the TD chain is linked back into the endpoint scheduling ring. Removing IOC from this Link TRB as well eliminated the remaining observed stalls. The attached patch implements this as an EJ168-specific quirk, XHCI_QUIRK_NO_LINK_IOC. The quirk is enabled only for PCI ID 1b6f:7023. Existing Link-TRB IOC behaviour is preserved for all other xHCI controllers. The existing sc_ctlstep workaround was also tested but was not required and is not included in the patch. The fix was tested with two independent USB 3.0 devices: 1. Realtek RTL8156 2.5GbE adapter - enumerates at SUPER (5.0Gbps) - cfg=3D0 - ue0 attaches successfully 2. Samsung Portable SSD T5 - enumerates at SUPER (5.0Gbps) - sustained approximately 165 MB/s during a non-destructive 4 GiB raw read, confirming actual SuperSpeed bulk transfer Both devices were also successfully configured simultaneously on the EJ168. This is an empirically verified workaround. I have not established the exact underlying EJ168 silicon error(s). --=20 You are receiving this mail because: You are the assignee for the bug.=