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From: Alan Stern <>
To: Kishon Vijay Abraham I <>
Cc: Greg Kroah-Hartman <>,
	Mathias Nyman <>,,,,
Subject: Re: [PATCH v4 1/3] usb: core: hcd: Add support for deferring roothub registration
Date: Thu, 9 Sep 2021 10:31:38 -0400	[thread overview]
Message-ID: <> (raw)
In-Reply-To: <>

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: # 5.4+
> Signed-off-by: Kishon Vijay Abraham I <>
> Suggested-by: Mathias Nyman <>
> Tested-by: Chris Chiu <>
> ---

Acked-by: Alan Stern <>

  reply	other threads:[~2021-09-09 14:31 UTC|newest]

Thread overview: 5+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-09-09  6:41 [PATCH v4 0/3] Fix cold plugged USB device on certain PCIe USB cards Kishon Vijay Abraham I
2021-09-09  6:41 ` [PATCH v4 1/3] usb: core: hcd: Add support for deferring roothub registration Kishon Vijay Abraham I
2021-09-09 14:31   ` Alan Stern [this message]
2021-09-09  6:41 ` [PATCH v4 2/3] xhci: Set HCD flag to defer primary " Kishon Vijay Abraham I
2021-09-09  6:42 ` [PATCH v4 3/3] usb: core: hcd: Modularize HCD stop configuration in usb_stop_hcd() Kishon Vijay Abraham I

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