linux-kernel - Re: xhci_hcd: Runtime PM causes port to inactivate

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Date:	Wed, 7 Dec 2011 21:15:22 +0100
From:	Patrik Kullman <patrik.kullman@...il.com>
To:	"Srivatsa S. Bhat" <srivatsa.bhat@...ux.vnet.ibm.com>
Cc:	linux-kernel <linux-kernel@...r.kernel.org>,
	Alan Stern <stern@...land.harvard.edu>,
	Steven Rostedt <rostedt@...dmis.org>,
	michal@...pspace.math.ualberta.ca, Oliver Neukum <oneukum@...e.de>,
	"Rafael J. Wysocki" <rjw@...k.pl>,
	Linux PM mailing list <linux-pm@...r.kernel.org>,
	"pavel@....cz" <pavel@....cz>,
	"len.brown@...el.com" <len.brown@...el.com>,
	Greg Kroah-Hartman <gregkh@...e.de>
Subject: Re: xhci_hcd: Runtime PM causes port to inactivate

Actually, I've been digging deeper into the suspend-issue, and the
xhci_hcd module is not to blame in my case. Running 3.2-rc4+, I only
need to use the parts of the script that unbinds/binds the ehci_hcd
module.

However, the original case of setting
/sys/bus/pci/devices/0000:03:00.0/power/control to "auto" causing the
USB-port to be inactivated is still valid.

2011/12/4 Srivatsa S. Bhat <srivatsa.bhat@...ux.vnet.ibm.com>:
> There is a very similar discussion going on at:
> http://thread.gmane.org/gmane.linux.kernel/1222803
>
> Cc'ing all the relevant people and mailing lists.
>
> Regards,
> Srivatsa S. Bhat
>
> On 12/04/2011 04:47 PM, Patrik Kullman wrote:
>
>> Issuing
>>
>> echo auto > /sys/bus/pci/devices/0000:03:00.0/power/control
>>
>> on my Asus Zenbook UX31E with a
>>
>> 03:00.0 USB Controller: Fresco Logic Device 1009 (rev 02)
>>
>> causes its USB3-port to become mostly disabled.
>>
>> It does have a "Charger+" feature that allows it to charge cellphones
>> etc even when turned off, and this feature works when power control is
>> in "auto" mode.
>>
>> In all other aspects, the port is turned off. It doesn't react to
>> devices being inserted.
>>
>> This does not feel like the desired behavior.
>>
>> Also, suspend does not work without unbinding the xhci_hcd module, not
>> sure if that is related.
>> Computer will not suspend/resume unless the following script is used
>> in /etc/pm/sleep.d:
>> https://help.ubuntu.com/community/AsusZenbook#Suspend.2C_Hibernate.2C_Shut-down_and_Reboot
>>
>> This behavior has not changed between 3.0 and 3.2-rc4+ that I've tried today.
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