Re: [RFT] PCI changes related to wakeup (was: Re: [linux-pm] ehci_hcd related S3 lockup on ASUS laptops, again)

On Fri, 2012-06-01 at 11:13 -0400, Alan Stern wrote:

On Thu, 31 May 2012, Rafael J. Wysocki wrote:

quoted

quoted

@@ -1743,6 +1743,11 @@ int pci_prepare_to_sleep(struct pci_dev
 	if (target_state == PCI_POWER_ERROR)
 		return -EIO;
 
+	/* Some devices mustn't be in D3 during system sleep */
+	if (target_state == PCI_D3hot &&
+			(dev->dev_flags & PCI_DEV_FLAGS_NO_D3_DURING_SLEEP))
+		return 0;
+

Why do you want to skip the wakeup setting in that case?

Because that's what the 151b61284776 commit did.  Also, the quirk marks 
the controller as not wakeup-capable.

Still, it's worth testing.  Andrey and Steve, here's an updated patch 
which should leave wakeup enabled on your EHCI controllers.  If you 
don't have a USB keyboard handy for generating a wakeup signal, you 
can test the wakeup functionality by doing:

	echo enabled >/sys/bus/usb/devices/usb1/power/wakeup
	echo enabled >/sys/bus/usb/devices/usb2/power/wakeup

before suspending.  (In fact you need only one of those two lines, but
at the moment I forget which -- probably the usb2 one.)  Then while
the system is asleep, either plugging or unplugging a USB device
directly into the computer should cause it to wake up.

I applied the patch, it suspends and resumes fine, but still no wakeup.

I even plugged in a USB keyboard, suspended, and tried to wake it up
with that. That did not work. I even enabled what you stated above, with
no effect (with keyboard or usb storage).

-- Steve