linux-kernel - Re: [PATCH v4 1/3] usb: core: hcd: Add support for deferring roothub registration

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Date:   Thu, 9 Sep 2021 10:31:38 -0400
From:   Alan Stern <stern@...land.harvard.edu>
To:     Kishon Vijay Abraham I <kishon@...com>
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Mathias Nyman <mathias.nyman@...el.com>,
        linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org,
        chris.chiu@...onical.com, lokeshvutla@...com
Subject: Re: [PATCH v4 1/3] usb: core: hcd: Add support for deferring roothub
 registration

On Thu, Sep 09, 2021 at 12:11:58PM +0530, Kishon Vijay Abraham I wrote:
> It has been observed with certain PCIe USB cards (like Inateck connected
> to AM64 EVM or J7200 EVM) that as soon as the primary roothub is
> registered, port status change is handled even before xHC is running
> leading to cold plug USB devices not detected. For such cases, registering
> both the root hubs along with the second HCD is required. Add support for
> deferring roothub registration in usb_add_hcd(), so that both primary and
> secondary roothubs are registered along with the second HCD.
> 
> CC: stable@...r.kernel.org # 5.4+
> Signed-off-by: Kishon Vijay Abraham I <kishon@...com>
> Suggested-by: Mathias Nyman <mathias.nyman@...ux.intel.com>
> Tested-by: Chris Chiu <chris.chiu@...onical.com>
> ---

Acked-by: Alan Stern <stern@...land.harvard.edu>