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

From: Fabio Baltieri
Date: Fri Feb 22 2013 - 20:44:44 EST

On Sat, Feb 23, 2013 at 01:35:26AM +0100, Rafael J. Wysocki wrote:
> On Saturday, February 23, 2013 01:10:55 AM Fabio Baltieri wrote:
> > 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.

Ok, as I wrote, I suspected this was just shutting off something and not
solving the real problem.

So, I'll try to recap all the threads here:

> 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?

With the acpi_add_power_resource disabled all power_state read "D0",
other attributes are not generated.

With a plain kernel that's the output:

$ 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 {} \;

> Can you please check if the problem is still there in the master
> branch of the linux-pm.git tree alone?

Not sure if this was for me or Dave, anyway linux-pm.git master
currently points as:

10baf04 Merge branch 'release' of git://

and the problem is still there.

> May I see the bisection log, BTW?

Sure, here it is:

git bisect start
# bad: [8793422fd9ac5037f5047f80473007301df3689f] Merge tag 'pm+acpi-3.9-rc1' of git://
git bisect bad 8793422fd9ac5037f5047f80473007301df3689f
# good: [19f949f52599ba7c3f67a5897ac6be14bfcb1200] Linux 3.8
git bisect good 19f949f52599ba7c3f67a5897ac6be14bfcb1200
# good: [8909ff652ddfc83ecdf450f96629c25489d88f77] Merge tag 'regulator-3.9' of git://
git bisect good 8909ff652ddfc83ecdf450f96629c25489d88f77
# good: [3aad3f03b2b6d2d977b985c49274cdb78a1593e5] Merge tag 'spi-for-linus' of git://
git bisect good 3aad3f03b2b6d2d977b985c49274cdb78a1593e5
# bad: [e8f71df723339b6d3861886f58c245812d1994f8] Merge branch 'acpi-cleanup'
git bisect bad e8f71df723339b6d3861886f58c245812d1994f8
# bad: [701190fd7419f6757c19cdc6473830c79debb3ae] clk: x86: add support for Lynxpoint LPSS clocks
git bisect bad 701190fd7419f6757c19cdc6473830c79debb3ae
# good: [3e5621a750e2cfb26748c34acbb67c691845494a] ACPICA: Update ACPICA initialization messages.
git bisect good 3e5621a750e2cfb26748c34acbb67c691845494a
# bad: [115c9ad854bd4c0f58ebcb967ec1b0a1c4e4b2d3] ACPI: remove unused acpi_op_bind and acpi_op_unbind
git bisect bad 115c9ad854bd4c0f58ebcb967ec1b0a1c4e4b2d3
# good: [e3863094c6f9b2f980d6e7a5cad6b4d03a4dd579] ACPI: Drop the second argument of acpi_bus_scan()
git bisect good e3863094c6f9b2f980d6e7a5cad6b4d03a4dd579
# good: [38a9a67a281eeebcd7cccf87f0e371f58ae625e3] ACPI / PCI: Move the _PRT setup and cleanup code to pci-acpi.c
git bisect good 38a9a67a281eeebcd7cccf87f0e371f58ae625e3
# good: [e0ebda2ee12c261fb2f2d7abf21489b93d9caa4e] ACPI: Remove unused struct member
git bisect good e0ebda2ee12c261fb2f2d7abf21489b93d9caa4e
# bad: [abe99210e0f624cea39f1dc375ba818b201c0d7f] ACPI / scan: Fix check of device_attach() return value.
git bisect bad abe99210e0f624cea39f1dc375ba818b201c0d7f
# bad: [f95988de06ea62ef5bd861f06e9ef56cea405ed1] ACPI / scan: Treat power resources in a special way
git bisect bad f95988de06ea62ef5bd861f06e9ef56cea405ed1

> Can you please send a dmesg boot log and the output of acpidump from the
> affected machine?




Fabio Baltieri
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