linux-kernel - [PATCH v3 0/3] Fix cold plugged USB device on certain PCIe USB cards

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Date:   Wed, 8 Sep 2021 15:23:09 +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 v3 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]
v1 Patch series can be found at [3]
v2 Patch series can be found at [4]

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.

Changes from v1:
1) Fixed code comments pointed out by Alan Stern
2) Renamed the HCD flag variable to "HCD_FLAG_DEFER_RH_REGISTER" from
   "HCD_FLAG_DEFER_PRI_RH_REGISTER"

Changes from v2:
1) Fixed issue in error path handling pointed by Alan

[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
[3] -> https://lore.kernel.org/r/20210825105132.10420-1-kishon@ti.com
[4] -> https://lore.kernel.org/r/20210826111426.751-1-kishon@ti.com

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

 drivers/usb/core/hcd.c  | 69 +++++++++++++++++++++++++++--------------
 drivers/usb/host/xhci.c |  1 +
 include/linux/usb/hcd.h |  2 ++
 3 files changed, 49 insertions(+), 23 deletions(-)

-- 
2.17.1