From: Kishon Vijay Abraham I <kishon@xxxxxx> commit b7a0a792f864583207c593b50fd1b752ed89f4c1 upstream. Set "HCD_FLAG_DEFER_RH_REGISTER" to hcd->flags in xhci_run() to defer registering primary roothub in usb_add_hcd(). This will make sure both primary roothub and secondary roothub will be registered along with the second HCD. This is required for cold plugged USB devices to be detected in certain PCIe USB cards (like Inateck USB card connected to AM64 EVM or J7200 EVM). CC: stable@xxxxxxxxxxxxxxx # 5.4+ Suggested-by: Mathias Nyman <mathias.nyman@xxxxxxxxxxxxxxx> Tested-by: Chris Chiu <chris.chiu@xxxxxxxxxxxxx> Signed-off-by: Kishon Vijay Abraham I <kishon@xxxxxx> Link: https://lore.kernel.org/r/20210909064200.16216-3-kishon@xxxxxx Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> --- drivers/usb/host/xhci.c | 1 + 1 file changed, 1 insertion(+) --- a/drivers/usb/host/xhci.c +++ b/drivers/usb/host/xhci.c @@ -692,6 +692,7 @@ int xhci_run(struct usb_hcd *hcd) if (ret) xhci_free_command(xhci, command); } + set_bit(HCD_FLAG_DEFER_RH_REGISTER, &hcd->flags); xhci_dbg_trace(xhci, trace_xhci_dbg_init, "Finished xhci_run for USB2 roothub");
