USB: Wait for extra delay time after USB_PORT_FEAT_RESET for quirky hub
authorKai-Heng Feng <kai.heng.feng@canonical.com>
Fri, 19 Oct 2018 08:14:50 +0000 (16:14 +0800)
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>
Wed, 7 Nov 2018 12:23:18 +0000 (13:23 +0100)
commit781f0766cc41a9dd2e5d118ef4b1d5d89430257b
treebd0c7b489f471e7754f3adbd78f44ca555b42bc5
parent651022382c7f8da46cb4872a545ee1da6d097d2a
USB: Wait for extra delay time after USB_PORT_FEAT_RESET for quirky hub

Devices connected under Terminus Technology Inc. Hub (1a40:0101) may
fail to work after the system resumes from suspend:
[  206.063325] usb 3-2.4: reset full-speed USB device number 4 using xhci_hcd
[  206.143691] usb 3-2.4: device descriptor read/64, error -32
[  206.351671] usb 3-2.4: device descriptor read/64, error -32

Info for this hub:
T:  Bus=03 Lev=01 Prnt=01 Port=01 Cnt=01 Dev#=  2 Spd=480 MxCh= 4
D:  Ver= 2.00 Cls=09(hub  ) Sub=00 Prot=01 MxPS=64 #Cfgs=  1
P:  Vendor=1a40 ProdID=0101 Rev=01.11
S:  Product=USB 2.0 Hub
C:  #Ifs= 1 Cfg#= 1 Atr=e0 MxPwr=100mA
I:  If#= 0 Alt= 0 #EPs= 1 Cls=09(hub  ) Sub=00 Prot=00 Driver=hub

Some expirements indicate that the USB devices connected to the hub are
innocent, it's the hub itself is to blame. The hub needs extra delay
time after it resets its port.

Hence wait for extra delay, if the device is connected to this quirky
hub.

Signed-off-by: Kai-Heng Feng <kai.heng.feng@canonical.com>
Cc: stable <stable@vger.kernel.org>
Acked-by: Alan Stern <stern@rowland.harvard.edu>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Documentation/admin-guide/kernel-parameters.txt
drivers/usb/core/hub.c
drivers/usb/core/quirks.c
include/linux/usb/quirks.h