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xhci: Set HCD flag to defer primary roothub registration
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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: [email protected] # 5.4+
Suggested-by: Mathias Nyman <[email protected]>
Tested-by: Chris Chiu <[email protected]>
Signed-off-by: Kishon Vijay Abraham I <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Greg Kroah-Hartman <[email protected]>
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kishon authored and gregkh committed Sep 14, 2021
1 parent 58877b0 commit b7a0a79
Showing 1 changed file with 1 addition and 0 deletions.
1 change: 1 addition & 0 deletions drivers/usb/host/xhci.c
Original file line number Diff line number Diff line change
Expand Up @@ -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");

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