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Add native legacy USB host controller support
This update extends the kernel configuration with native support for USB host controllers covering USB 2.0, USB 1.1, and USB 1.0.
The existing configuration already provides xHCI support for modern USB controllers. This change additionally enables the legacy EHCI, OHCI, and UHCI host controller drivers as loadable modules.
The goal is to provide broader native USB controller compatibility, particularly for older hardware and devices where compatibility, timing, latency, or controller-specific behavior can differ from modern xHCI implementations.
Changes
Enabled as modules:
CONFIG_USB_EHCI_HCD=mCONFIG_USB_EHCI_PCI=mCONFIG_USB_OHCI_HCD=mCONFIG_USB_OHCI_HCD_PCI=mCONFIG_USB_UHCI_HCD=mKconfig automatically enabled the required supporting options, while platform-specific and unused controller variants remain disabled.
The existing xHCI configuration remains unchanged:
CONFIG_USB_XHCI_HCD=mCONFIG_USB_XHCI_PCI=mCompatibility
The added EHCI/OHCI/UHCI drivers provide support for systems containing legacy USB host controllers without changing the USB controller path used by the current hardware.
The system's AMD Matisse USB controllers continue to use
xhci_hcdwith the PCI xHCI driver.Using modules keeps these legacy drivers out of the kernel's permanently loaded code path unless hardware requiring them is present.