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mirrortokyo

Member

Registered: 2021-04-08

Posts: 53  

6.12 kernel and Renesas USB 3.0 USB host controllers

I wasted several hours bisecting the failure of the 6.12-rc? kernels to recognise USB hard disks connected to a Renesas USB 3.0 host controller.

The hardware affected was identified as:

lspci output:

02:00.0 USB controller: Renesas Electronics Corp. uPD720201 USB 3.0 Host Controller (rev 03)

lspci -n output:

02:00.0 0c03: 1912:0014 (rev 03)

This hardware had been supported in the Linux kernel for some years with the xhci_pci module enabled by CONFIG_USB_XHCI_PCI=m

Now with 6.12.0-rc? kernels it also requires the xhci_pci_renesas module enabled by CONFIG_USB_XHCI_PCI_RENESAS=m.

The problem is that CONFIG_USB_XHCI_PCI_RENESAS=m is not enabled unless manually selected.

Hope that this saves someone some time.