xhci: Set HCD flag to defer primary roothub registration

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@vger.kernel.org # 5.4+
Suggested-by: Mathias Nyman <mathias.nyman@linux.intel.com>
Tested-by: Chris Chiu <chris.chiu@canonical.com>
Signed-off-by: Kishon Vijay Abraham I <kishon@ti.com>
Link: https://lore.kernel.org/r/20210909064200.16216-3-kishon@ti.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/usb/host/xhci.c b/drivers/usb/host/xhci.c
index c51391b45207ebaf9a00c9c3f2b4a25b48cf2177..6389dc99bc9a4b3e8d3d7bec7dace488daac6fa9 100644 (file)
--- a/drivers/usb/host/xhci.c
+++ b/drivers/usb/host/xhci.c
@@ -693,6 +693,7 @@ 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");