linux-kernel - Re: [PATCH] gpio/gpio-pl061: No need of thaw and poweroff routines for hibernate

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Message-ID: <20120216133801.GB29232@ponder.secretlab.ca>
Date:	Thu, 16 Feb 2012 06:38:01 -0700
From:	Grant Likely <grant.likely@...retlab.ca>
To:	Viresh Kumar <viresh.kumar@...com>
Cc:	rjw@...k.pl, baruch@...s.co.il, linux-kernel@...r.kernel.org,
	armando.visconti@...com, shiraz.hashim@...com, vipin.kumar@...com,
	rajeev-dlh.kumar@...com, deepak.sikri@...com,
	vipulkumar.samar@...com, amit.virdi@...com, pratyush.anand@...com,
	bhupesh.sharma@...com, viresh.linux@...il.com, bhavna.yadav@...com,
	vincenzo.frascino@...com, mirko.gardi@...com,
	linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH] gpio/gpio-pl061: No need of thaw and poweroff routines
 for hibernate

On Wed, Jan 11, 2012 at 03:25:20PM +0530, Viresh Kumar wrote:
> pl061 uses same routines for suspend/freeze/poweroff and resume/thaw/restore.
> We are only saving and restoring register values on these routines.
> 
> During hibernation, in freeze() we take a snapshot of gpio registers. In thaw()
> we don't actually need to restore these registers, as power was never shut down
> till now. Similarly, in poweroff() we don't need to take snapshot of these
> registers again, as it was done during freeze() and by now the image is already
> saved on disk.
> 
> This patch passes poweroff() and thaw() routines as NULL to avoid this extra
> work done.
> 
> Signed-off-by: Viresh Kumar <viresh.kumar@...com>

Applied, thanks.

g.

> ---
>  drivers/gpio/gpio-pl061.c |    7 ++++++-
>  1 files changed, 6 insertions(+), 1 deletions(-)
> 
> diff --git a/drivers/gpio/gpio-pl061.c b/drivers/gpio/gpio-pl061.c
> index 84ba1dd..45b884b 100644
> --- a/drivers/gpio/gpio-pl061.c
> +++ b/drivers/gpio/gpio-pl061.c
> @@ -430,7 +430,12 @@ static int pl061_resume(struct device *dev)
>  	return 0;
>  }
>  
> -static SIMPLE_DEV_PM_OPS(pl061_dev_pm_ops, pl061_suspend, pl061_resume);
> +static const struct dev_pm_ops pl061_dev_pm_ops = {
> +	.suspend = pl061_suspend,
> +	.resume = pl061_resume,
> +	.freeze = pl061_suspend,
> +	.restore = pl061_resume,
> +};
>  #endif
>  
>  static struct amba_id pl061_ids[] = {
> -- 
> 1.7.8.110.g4cb5d
> 
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