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Subject: Re: [RFC][PATCH 7/7] PM: Asynchronous suspend and resume of i8042
From: Zhang Rui <rui.zhang@intel.com>
To: "Rafael J. Wysocki" <rjw@sisk.pl>
Cc: linux-pm <linux-pm@lists.linux-foundation.org>,
       linux-acpi <linux-acpi@vger.kernel.org>,
       Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
       Len Brown <lenb@kernel.org>, Alan Stern <stern@rowland.harvard.edu>,
       Arjan van de Ven <arjan@linux.intel.com>, Greg KH <gregkh@suse.de>
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Date: Tue, 18 Aug 2009 15:03:30 +0800
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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.

thanks,
rui
> ---
>  drivers/input/serio/i8042.c |    2 ++
>  1 file changed, 2 insertions(+)
> 
> Index: linux-2.6/drivers/input/serio/i8042.c
> ===================================================================
> --- linux-2.6.orig/drivers/input/serio/i8042.c
> +++ linux-2.6/drivers/input/serio/i8042.c
> @@ -1289,6 +1289,8 @@ static int __init i8042_init(void)
>  	if (err)
>  		goto err_free_device;
>  
> +	device_enable_async_suspend(&i8042_platform_device->dev, true);
> +
>  	panic_blink = i8042_panic_blink;
>  
>  	return 0;