lkml.org 
[lkml]   [2021]   [Sep]   [9]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
From
Subject[PATCH v4 0/3] Fix cold plugged USB device on certain PCIe USB cards
Date
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]
v3 Patch series can be found at [5]

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

Changes from v3:
1) Fix un-initialized variable usb_remove_hcd() and did some cleanup
suggested 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
[5] -> https://lore.kernel.org/r/20210908145146.GB603644@rowland.harvard.edu

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 | 68 +++++++++++++++++++++++++++--------------
drivers/usb/host/xhci.c | 1 +
include/linux/usb/hcd.h | 2 ++
3 files changed, 48 insertions(+), 23 deletions(-)

--
2.17.1

\
 
 \ /
  Last update: 2021-09-09 08:43    [W:0.061 / U:0.492 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site