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xhci: Set HCD flag to defer primary roothub registration
Set "HCD_FLAG_DEFER_RH_REGISTER" to hcd->flags in xhci_run() to defer registering primary roothub in usb_add_hcd() if xhci has two roothubs. 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). This patch has been added and reverted earier as it triggered a race in usb device enumeration. That race is now fixed in 5.16-rc3, and in stable back to 5.4 commit6cca13de26
("usb: hub: Fix locking issues with address0_mutex") commit6ae6dc22d2
("usb: hub: Fix usb enumeration issue due to address0 race") [minor rebase change, and commit message update -Mathias] 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/20220510091630.16564-3-kishon@ti.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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@ -696,6 +696,8 @@ int xhci_run(struct usb_hcd *hcd)
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xhci_dbg_trace(xhci, trace_xhci_dbg_init,
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xhci_dbg_trace(xhci, trace_xhci_dbg_init,
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"Finished xhci_run for USB2 roothub");
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"Finished xhci_run for USB2 roothub");
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set_bit(HCD_FLAG_DEFER_RH_REGISTER, &hcd->flags);
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xhci_create_dbc_dev(xhci);
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xhci_create_dbc_dev(xhci);
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xhci_debugfs_init(xhci);
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xhci_debugfs_init(xhci);
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