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From: Kishon Vijay Abraham I <kishon@ti.com>
To: Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
	Mathias Nyman <mathias.nyman@intel.com>,
	Alan Stern <stern@rowland.harvard.edu>
Cc: <linux-usb@vger.kernel.org>, <linux-kernel@vger.kernel.org>,
	<chris.chiu@canonical.com>,
	Kishon Vijay Abraham I <kishon@ti.com>, <lokeshvutla@ti.com>
Subject: [PATCH 0/3] Fix cold plugged USB device on certain PCIe USB cards
Date: Wed, 25 Aug 2021 16:21:29 +0530	[thread overview]
Message-ID: <20210825105132.10420-1-kishon@ti.com> (raw)

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


             reply	other threads:[~2021-08-25 10:51 UTC|newest]

Thread overview: 7+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-08-25 10:51 Kishon Vijay Abraham I [this message]
2021-08-25 10:51 ` [PATCH 1/3] usb: core: hcd: Modularize HCD stop configuration in usb_stop_hcd() Kishon Vijay Abraham I
2021-08-25 14:45   ` Alan Stern
2021-08-25 10:51 ` [PATCH 2/3] usb: core: hcd: Add support for deferring roothub registration Kishon Vijay Abraham I
2021-08-25 14:52   ` Alan Stern
2021-08-25 10:51 ` [PATCH 3/3] xhci: Set HCD flag to defer primary " Kishon Vijay Abraham I
2021-08-25 14:46   ` Kishon Vijay Abraham I

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