lkml.org 
[lkml]   [2018]   [Aug]   [13]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
From
Subject[Query] USB device autosuspend and its runtime usage count.
Date
Hi ,
I need to test a functionality with USB autosuspend with latest kernel
Linux 4.18-rc8. I am trying to autosuspend a USB key board, i enabled
its autosuspend by doing echo "auto" to its "control" attributes.
I am expecting USB keyboard to go to autosuspend after autosuspend_delay_ms.
But USB key board is not going to autosuspend because its runtime usage
count is not equal to zero.

Below are the log snippets:

root@intel-Kabylake-Client-platform:# cat /sys/bus/usb/devices/1-5/power/runtime_enabled
enabled
root@intel-Kabylake-Client-platform:# cat /sys/bus/usb/devices/1-5/power/control
auto
root@intel-Kabylake-Client-platform:# cat /sys/bus/usb/devices/1-5/power/autosuspend_delay_ms
2000
root@intel-Kabylake-Client-platform:# cat /sys/bus/usb/devices/1-5/power/runtime_status
active
root@intel-Kabylake-Client-platform:# cat /sys/bus/usb/devices/1-5/power/runtime_usage
1
root@intel-Kabylake-Client-platform:# sleep 60; cat /sys/bus/usb/devices/1-5/power/runtime_usage
1

My USB keyboard runtime usage reference count is not decreasing to zero.
Here am i missing something regarding runtime usage count or is it some issue with
my kernel or OS?

Thanks,
Anshuman Gupta.

\
 
 \ /
  Last update: 2018-08-13 08:48    [W:0.308 / U:0.224 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site