linux-kernel - [PATCH 0/3] Fix cold plugged USB device on certain PCIe USB cards

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Date:   Wed, 25 Aug 2021 16:21:29 +0530
From:   Kishon Vijay Abraham I <kishon@...com>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Mathias Nyman <mathias.nyman@...el.com>,
        Alan Stern <stern@...land.harvard.edu>
CC:     <linux-usb@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <chris.chiu@...onical.com>, Kishon Vijay Abraham I <kishon@...com>,
        <lokeshvutla@...com>
Subject: [PATCH 0/3] Fix cold plugged USB device on certain PCIe USB cards

Cold plugged USB device was not detected on certain PCIe USB cards
(like Inateck card connected to AM64 EVM or connected to J7200 EVM).

Re-plugging the USB device always gets it enumerated.

This issue was discussed in
https://lore.kernel.org/r/772e4001-178e-4918-032c-6e625bdded24@ti.com
and
https://bugzilla.kernel.org/show_bug.cgi?id=214021

So the suggested solution is to register both root hubs along with the
second hcd for xhci.

RFC Patch series can be found at [1]

Changes from RFC:
1) Mathias identified potential issues with the RFC patch [2] and suggested
   the solution to use HCD flags. This series implements it.

[1] -> https://lore.kernel.org/linux-usb/20210824105302.25382-1-kishon@ti.com/ 
[2] -> https://lore.kernel.org/linux-usb/06693934-28f2-d59e-b004-62cabd3f9e8e@linux.intel.com

Kishon Vijay Abraham I (3):
  usb: core: hcd: Modularize HCD stop configuration in usb_stop_hcd()
  usb: core: hcd: Add support for deferring roothub registration
  xhci: Set HCD flag to defer primary roothub registration

 drivers/usb/core/hcd.c  | 67 +++++++++++++++++++++++++++--------------
 drivers/usb/host/xhci.c |  2 +-
 include/linux/usb/hcd.h |  2 ++
 3 files changed, 48 insertions(+), 23 deletions(-)

-- 
2.17.1