linux-kernel - Re: [RFC][PATCH 7/7] PM: Asynchronous suspend and resume of i8042

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Date:	Wed, 19 Aug 2009 01:40:26 +0200
From:	"Rafael J. Wysocki" <rjw@...k.pl>
To:	Zhang Rui <rui.zhang@...el.com>
Cc:	"linux-pm" <linux-pm@...ts.linux-foundation.org>,
	"linux-acpi" <linux-acpi@...r.kernel.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Len Brown <lenb@...nel.org>,
	Alan Stern <stern@...land.harvard.edu>,
	Arjan van de Ven <arjan@...ux.intel.com>,
	Greg KH <gregkh@...e.de>
Subject: Re: [RFC][PATCH 7/7] PM: Asynchronous suspend and resume of i8042

On Tuesday 18 August 2009, Rafael J. Wysocki wrote:
> On Tuesday 18 August 2009, Zhang Rui wrote:
> > On Mon, 2009-08-17 at 08:21 +0800, Rafael J. Wysocki wrote:
> > > Set async_suspend for i8042.
> > > 
> > it's the psmouse reset that takes the 0.4 seconds during suspend.
> > so we should call device_enable_async_suspend for the psmouse serio
> > device in psmouse-base.c
> > 
> > Or invoking device_enable_async_suspend for every serio device in
> > serio.c, as the keyboard also takes about 0.2s to suspend.
> 
> Yes we can do that.  I'll test that later today.

The appended patch appears to work on my test box.

Thanks,
Rafael

---
Set async_suspend for serio input devices.

---
 drivers/input/serio/serio.c |    1 +
 1 file changed, 1 insertion(+)

Index: linux-2.6/drivers/input/serio/serio.c
===================================================================
--- linux-2.6.orig/drivers/input/serio/serio.c
+++ linux-2.6/drivers/input/serio/serio.c
@@ -576,6 +576,7 @@ static void serio_add_port(struct serio 
 			printk(KERN_ERR
 				"serio: sysfs_create_group() failed for %s (%s), error: %d\n",
 				serio->phys, serio->name, error);
+		device_enable_async_suspend(&serio->dev, true);
 	}
 }
 
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