linux-kernel - Re: [GIT PATCH] USB patches for 3.9-rc1

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Message-ID: <8156425.nbPzS18WCu@vostro.rjw.lan>
Date:	Sat, 23 Feb 2013 01:35:26 +0100
From:	"Rafael J. Wysocki" <rjw@...k.pl>
To:	Fabio Baltieri <fabio.baltieri@...aro.org>
Cc:	Dave Jones <davej@...hat.com>,
	Greg KH <gregkh@...uxfoundation.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org, linux-usb@...r.kernel.org,
	tianyu.lan@...el.com,
	"Rafael J. Wysocki" <rafael.j.wysocki@...el.com>,
	linux-acpi@...r.kernel.org
Subject: Re: [GIT PATCH] USB patches for 3.9-rc1

On Saturday, February 23, 2013 01:10:55 AM Fabio Baltieri wrote:
> On Fri, Feb 22, 2013 at 05:23:04PM -0500, Dave Jones wrote:
> > On Fri, Feb 22, 2013 at 10:51:58PM +0100, Fabio Baltieri wrote:
> >  > On Fri, Feb 22, 2013 at 03:59:54AM -0500, Dave Jones wrote:
> >  > > On Thu, Feb 21, 2013 at 10:40:10AM -0800, Greg KH wrote:
> >  > > 
> >  > > It looks like every port on my laptop is powered down, as I can't
> >  > > even charge devices with it.
> >  > 
> >  > I have the same problem (and almost the same laptop, Thinkpad T430
> >  > here), all external USB ports without power - even the always-on one
> >  > :-).
> >  > 
> >  > The bug seems to be ACPI related, I bisected it down to this patch:
> >  > 
> >  > f95988d ACPI / scan: Treat power resources in a special way
> >  > 
> >  > In the dmesg I have some error like these:
> >  > 
> >  > ACPI: Power Resource [PUBS] (on)
> >  > ...
> >  > pci 0000:00:14.0: System wakeup disabled by ACPI
> >  > 
> >  > for the USB controllers in the broken kernel, there are some in your
> >  > dmesg too.  I'll try to come up with a fix for current mainline, but all
> >  > the acpi stuff is quite obscure to me and the patch does not revert
> >  > cleanly, maybe Rafael (in CC) has some idea!
> > 
> > Good find. I see the same thing.
> > 
> > [    0.930283] ACPI _OSC control for PCIe not granted, disabling ASPM
> > [    0.933527] pci 0000:00:14.0: System wakeup disabled by ACPI
> > [    0.935982] pci 0000:00:19.0: System wakeup disabled by ACPI
> > [    0.937898] pci 0000:00:1a.0: System wakeup disabled by ACPI
> > [    0.939835] pci 0000:00:1b.0: System wakeup disabled by ACPI
> > [    0.940700] ACPI: PCI Interrupt Routing Table [\_SB_.PCI0.EXP1._PRT]
> > [    0.942195] ACPI: PCI Interrupt Routing Table [\_SB_.PCI0.EXP2._PRT]
> > [    0.943737] ACPI: PCI Interrupt Routing Table [\_SB_.PCI0.EXP3._PRT]
> > [    0.944564] pci 0000:00:1c.2: System wakeup disabled by ACPI
> > [    0.966491] pci 0000:00:1d.0: System wakeup disabled by ACPI
> > 
> > I must have pulled in the acpi bits the same time as the usb pull,
> > because I don't recall seeing this problem before last night.
> 
> Definitely.
> 
> Well, this did the trick in my case:
> 
> --- >8 ---
> diff --git a/drivers/acpi/power.c b/drivers/acpi/power.c
> index b820528..54175a0 100644
> --- a/drivers/acpi/power.c
> +++ b/drivers/acpi/power.c
> @@ -795,7 +795,7 @@ int acpi_add_power_resource(acpi_handle handle)
>         int state, result = -ENODEV;
>  
>         acpi_bus_get_device(handle, &device);
> -       if (device)
> +       if (!device)
>                 return 0;
>  
>         resource = kzalloc(sizeof(*resource), GFP_KERNEL);
> --- >8 ---
> 
> But I guess it's working as a coincidence and something else is wrong -
> I'll not even try to make a patch out of it and will leave the dirty
> work to the ACPI guys instead.

Well, this patch effectively disables the handling of power resources on your
machine entirely.  The effect of which is probably that the power resources
can't be turned off for the USB controllers, so they don't go into D3cold.

And the bisection found a commit that restores the handling of power resources
for you, which is not entirely surprising, but the root cause is somewhere else
most likely.

The new sysfs interface for power resources control may be helpful here.  You
need to use the Linus' current for it to work, though.

Can you please do

$ find /sys/devices/LNXSYSTM:00/ -name power_state -print -exec cat {} \;

$ find /sys/devices/LNXSYSTM:00/ -name real_power_state -print -exec cat {} \;

$ find /sys/devices/LNXSYSTM:00/ -name power_resources_D\* -print -exec ls {} \;

$ find /sys/devices/LNXSYSTM:00/ -name resource_in_use -print -exec cat {} \;

and send the output?

Rafael


-- 
I speak only for myself.
Rafael J. Wysocki, Intel Open Source Technology Center.
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