linux-kernel - Re: PME via interrupt or SCI mechanism?

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Message-ID: <20110927235216.GA5765@xanatos>
Date:	Tue, 27 Sep 2011 16:52:16 -0700
From:	Sarah Sharp <sarah.a.sharp@...ux.intel.com>
To:	"Rafael J. Wysocki" <rjw@...k.pl>
Cc:	linux-acpi@...r.kernel.org, linux-pci@...r.kernel.org,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: PME via interrupt or SCI mechanism?

On Tue, Sep 27, 2011 at 10:54:47PM +0200, Rafael J. Wysocki wrote:
> On Tuesday, September 27, 2011, Sarah Sharp wrote:
> > On Tue, Sep 27, 2011 at 12:20:26AM +0200, Rafael J. Wysocki wrote:
> > > On Sunday, September 25, 2011, Rafael J. Wysocki wrote:
> > > > On Thursday, September 22, 2011, Sarah Sharp wrote:
> > > > > On Mon, Sep 19, 2011 at 11:43:33PM +0200, Rafael J. Wysocki wrote:
> > > > Without looking at the tables at the moment (I'll do that later),
> > > > I think that they are missing the information that GPE 0D is a wakeup
> > > > GPE for the xHCI device.
> > > 
> > > The DSDT appears to contain that information, so I'm not sure what's
> > > going on.  Perhaps you can put a debug printk into acpi_dev_run_wake()
> > > to see if that function is called for the xHCI controllers?
> > 
> > I put a printk in acpi_dev_run_wake(), and that shows up in the original
> > dmesg I sent:
> > 
> > Sep 22 10:47:09 talon kernel: [ 2026.211933] xhci_hcd 0000:00:14.0: acpi_pci_run_wake - enable dev wake
> > Sep 22 10:47:09 talon kernel: [ 2026.211936] acpi device:34: acpi_dev_run_wake - enable dev wake
> > Sep 22 10:47:09 talon kernel: [ 2026.211955] acpi device:34: acpi_dev_run_wake - return -19
> 
> OK, can you printk() dev->wakeup.gpe_number here?
> 
> [/me realizes that "error" is not really used in this function.  Bah.]

Ok, here's what dmesg says (I used %u not 0x%x for the GPE number):

Sep 27 16:30:34 talon kernel: [  882.301023] xhci_hcd 0000:00:14.0: xhci_pci_suspend
Sep 27 16:30:34 talon kernel: [  882.301029] xhci_hcd 0000:00:14.0: xhci_suspend
Sep 27 16:30:34 talon kernel: [  882.301039] xhci_hcd 0000:00:14.0: // Setting command ring address to 0x30c3f001
Sep 27 16:30:34 talon kernel: [  882.301090] xhci_hcd 0000:00:14.0: hcd_pci_runtime_suspend: 0
Sep 27 16:30:34 talon kernel: [  882.301140] acpi_bus_power_manageable - result 0, device->flags.power_manageable 0
Sep 27 16:30:34 talon kernel: [  882.301143] xhci_hcd 0000:00:14.0: acpi_pci_power_manageable - dev is not power manageable
Sep 27 16:30:34 talon kernel: [  882.301146] acpi_bus_power_manageable - result 0, device->flags.power_manageable 0
Sep 27 16:30:34 talon kernel: [  882.301149] xhci_hcd 0000:00:14.0: __pci_enable_wake - enable runtimewake
Sep 27 16:30:34 talon kernel: [  882.301156] xhci_hcd 0000:00:14.0: PME# enabled
Sep 27 16:30:34 talon kernel: [  882.301159] xhci_hcd 0000:00:14.0: acpi_pci_run_wake - enable dev wake
Sep 27 16:30:34 talon kernel: [  882.301162] acpi device:34: acpi_dev_run_wake - enable dev wake
Sep 27 16:30:34 talon kernel: [  882.301175] acpi device:34: acpi_dev_run_wake - enable gpe 13
Sep 27 16:30:34 talon kernel: [  882.301185] acpi device:34: acpi_dev_run_wake - return -19
Sep 27 16:30:34 talon kernel: [  882.301188] xhci_hcd 0000:00:14.0: pci_raw_set_power_state from 0 to 3
Sep 27 16:30:34 talon kernel: [  882.312288] acpi_bus_power_manageable - result 0, device->flags.power_manageable 0
Sep 27 16:30:34 talon kernel: [  882.312293] xhci_hcd 0000:00:14.0: acpi_pci_power_manageable - dev is not power manageable
Sep 27 16:30:34 talon kernel: [  882.312296] acpi_bus_power_manageable - result 0, device->flags.power_manageable 0
Sep 27 16:30:34 talon kernel: [  882.312299] xhci_hcd 0000:00:14.0: pci_platform_power_transition - is NOT power managable

If I wake up the host controller by plugging in a webcam into an external hub:

Sep 27 16:31:46 talon kernel: [  953.645014] ehci_hcd 0000:00:1d.0: pci_acpi_wake_dev
Sep 27 16:31:46 talon kernel: [  953.645023] ehci_hcd 0000:00:1a.0: pci_acpi_wake_dev
Sep 27 16:31:46 talon kernel: [  953.645029] snd_hda_intel 0000:00:1b.0: pci_acpi_wake_dev
Sep 27 16:31:46 talon kernel: [  953.645034] e1000e 0000:00:19.0: pci_acpi_wake_dev
Sep 27 16:31:46 talon kernel: [  953.645089] ehci_hcd 0000:00:1d.0: pci_acpi_wake_dev
Sep 27 16:31:46 talon kernel: [  953.645094] ehci_hcd 0000:00:1a.0: pci_acpi_wake_dev
Sep 27 16:31:46 talon kernel: [  953.645098] snd_hda_intel 0000:00:1b.0: pci_acpi_wake_dev
Sep 27 16:31:46 talon kernel: [  953.645103] e1000e 0000:00:19.0: pci_acpi_wake_dev

Those lines repeat constantly until I echo on to the power/control file
for the xHCI device.

If I cat the /sys/firmware/acpi/interrupts/gpe0D file *before* I disable
D3, I see:

root@...on:/sys/firmware/acpi/interrupts# cat gpe0D
  211327   enabled
root@...on:/sys/firmware/acpi/interrupts# 

I think I was catting the file after I ran `echo on > power/control`
previously.  Sorry for the confusion.

So it looks like gpe 0xD is enabled when the host goes into D3, and
acpi_dev_run_wake is calling acpi_enable_gpe() with GPE 13 (i.e. 0xD),
correct?

Sarah Sharp
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