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[86.185.73.183]) by smtp.gmail.com with ESMTPSA id ffacd0b85a97d-4959783f1d6sm10542798f8f.46.2026.11.09.07.53.21 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 09 Nov 2026 07:53:21 -0800 (PST) Message-ID: <6af1ec71.fb59a2f3.1b24d6.5d62@mx.google.com> Date: Mon, 09 Nov 2026 07:53:21 -0800 (PST) From: James R Taylor To: Mika Westerberg Cc: linux-usb@vger.kernel.org, Mario Limonciello , Sanath S , Basavaraj Natikar Subject: Re: thunderbolt: AMD Phoenix USB4 host advertises Gen3 Support=0 in SB LINK_CONF with TB5 device, link stuck at Gen2 In-Reply-To: <20261109155007.GV176724@black.igk.intel.com> References: <1794143745.17311.hermes@gmail.com> <20261109111852.GQ176724@black.igk.intel.com> <1794223545.366398.reply.hermes@gmail.com> <20261109142041.GS176724@black.igk.intel.com> <1794235167.3657.reply.hermes@gmail.com> <20261109153955.GU176724@black.igk.intel.com> <6af1e999.9efe04cf.8f35d.ae23@mx.google.com> <20261109155007.GV176724@black.igk.intel.com> X-Mailing-List: linux-usb@vger.kernel.org List-Id: List-Post: List-Help: List-Subscribe: List-Unsubscribe: List-Owner: Precedence: list MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Hi Mika, On Mon, Nov 09, 2026 at 04:50:07PM +0100, Mika Westerberg wrote: > That's the host side retimer. Thanks, that clears it up. > Agree it looks like the AMD host only gets the link up Gen2 for some > reason. It could be retimer/PD firmware issue. Anyways I'm adding the AMD > experts if they have any ideas. Thank you very much for looking at this and for adding them. For Mario, Sanath and Basavaraj, a short summary of the setup and what has been measured so far (the full logs and tbdump output are earlier in this thread): - Host: Minisforum UM890 Pro (AMD Phoenix), BIOS 1.06 (11/10/2025), AGESA PhoenixPI-FP8-FP7 1.2.0.0a, kernel 7.2.15. - Device: Minisforum DEG2 (TB5 eGPU dock, NVM 62.42), StarTech TBLT5MM50CM240W 0.5 m TB5 cable. - Host-side retimer 1-0:2.1, vendor 0x7fea device 0x1032. - Link comes up as TBT, 10.0 Gb/s x2. Host PORT_CS_18 reports Cable USB4 Version 0 and CG3=0; the DEG2 side reports Version 1 and CG3=1. - Sideband LINK_CONFIGURATION (0x0c): host 03 d3 03 (Gen3 bit not set), DEG2 03 f3 1b (Gen3 bit set). Writing the Gen3 bit on the host side from Linux fails with -EIO. - Same result with thunderbolt.host_reset=0 and =1, and on a clean boot without host_reset/pcie_aspm=off. - The firmware exposes no UCSI device (no USBC000/PNP0CA0 in ACPI), so /sys/class/typec is absent and I can't see from Linux which mode the PD controller chose. I'm happy to collect any other register reads or logs that would help. Thanks again, James