linux-kernel - Re: [PATCH 4/6] arm: mach-omap2: remove "OMAP_DEVICE_NO_IDLE_ON

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Date:	Thu, 18 Apr 2013 11:05:37 -0700
From:	Kevin Hilman <khilman@...aro.org>
To:	Sourav Poddar <sourav.poddar@...com>
Cc:	<gregkh@...uxfoundation.org>, <tony@...mide.com>,
	<rmk+kernel@....linux.org.uk>, <linux-serial@...r.kernel.org>,
	<linux-omap@...r.kernel.org>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 4/6] arm: mach-omap2: remove "OMAP_DEVICE_NO_IDLE_ON_SUSPEND" check

Sourav Poddar <sourav.poddar@...com> writes:

> Remove the "OMAP_DEVICE_NO_IDLE_ON_SUSPEND" check, since UART was the only one making
> use of it. Now serial core/driver takes care of the case when "no_console_suspend" 
> is used in the bootargs and you need to keep the clock enable for console even while suspend.
>
> Signed-off-by: Sourav Poddar <sourav.poddar@...com>

NAK.  This patch will break many things...

> ---
>  arch/arm/mach-omap2/omap_device.c |    7 +------
>  1 files changed, 1 insertions(+), 6 deletions(-)
>
> diff --git a/arch/arm/mach-omap2/omap_device.c b/arch/arm/mach-omap2/omap_device.c
> index 381be7a..d6dce8f 100644
> --- a/arch/arm/mach-omap2/omap_device.c
> +++ b/arch/arm/mach-omap2/omap_device.c
> @@ -620,11 +620,8 @@ static int _od_suspend_noirq(struct device *dev)
>  	ret = pm_generic_suspend_noirq(dev);
>  
>  	if (!ret && !pm_runtime_status_suspended(dev)) {
> -		if (pm_generic_runtime_suspend(dev) == 0) {
> -			if (!(od->flags & OMAP_DEVICE_NO_IDLE_ON_SUSPEND))
> -				omap_device_idle(pdev);

Why did you remove the omap_device_idle() here?

> +		if (pm_generic_runtime_suspend(dev) == 0)
>  			od->flags |= OMAP_DEVICE_SUSPENDED;
> -		}
>  	}
>  
>  	return ret;
> @@ -638,8 +635,6 @@ static int _od_resume_noirq(struct device *dev)
>  	if ((od->flags & OMAP_DEVICE_SUSPENDED) &&
>  	    !pm_runtime_status_suspended(dev)) {
>  		od->flags &= ~OMAP_DEVICE_SUSPENDED;
> -		if (!(od->flags & OMAP_DEVICE_NO_IDLE_ON_SUSPEND))
> -			omap_device_enable(pdev);

And the _enable() here?

>  		pm_generic_runtime_resume(dev);
>  	}

Note that the check is for when the flag is *not* set, so this patch
changes behavior for all the drivers that do not use
_NO_IDLE_ON_SUSPEND.  I think that's the opposite of what you intended.

Kevin
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