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PCIe r7.0 Section 7.7.9 Device 3 Extended Capability Structure, defines the canonical location for determining the Flit Mode of a device. This status is a dependency for PCIe IDE enabling. Add a new fm_enabled flag to 'struct pci_dev'. Cc: Lukas Wunner <lukas@wunner.de> Cc: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com> Cc: Bjorn Helgaas <bhelgaas@google.com> Cc: Samuel Ortiz <sameo@rivosinc.com> Cc: Alexey Kardashevskiy <aik@amd.com> Cc: Xu Yilun <yilun.xu@linux.intel.com> Acked-by: Bjorn Helgaas <bhelgaas@google.com> Reviewed-by: Jonathan Cameron <jonathan.cameron@huawei.com> Link: https://patch.msgid.link/20251031212902.2256310-6-dan.j.williams@intel.com Signed-off-by: Dan Williams <dan.j.williams@intel.com>