linux-kernel - Re: [PATCH 2/2] cpufreq: db8500: set CPUFREQ_CONST

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Message-ID: <50CF634F.1040708@codeaurora.org>
Date:	Mon, 17 Dec 2012 10:24:15 -0800
From:	Stephen Boyd <sboyd@...eaurora.org>
To:	Fabio Baltieri <fabio.baltieri@...aro.org>
CC:	John Stultz <johnstul@...ibm.com>, Arnd Bergmann <arnd@...db.de>,
	Thomas Gleixner <tglx@...utronix.de>,
	"Rafael J. Wysocki" <rjw@...k.pl>, linux-pm@...r.kernel.org,
	Linus Walleij <linus.walleij@...aro.org>,
	linux-kernel@...r.kernel.org, cpufreq@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH 2/2] cpufreq: db8500: set CPUFREQ_CONST_LOOPS

On 12/04/12 02:10, Fabio Baltieri wrote:
> As ux500 is being converted to timer based delay loops, and the timer
> used is not depending on CPUs clock frequency, set cpufreq_driver flag
> CPUFREQ_CONST_LOOPS to prevent cpufreq rescaling loops_for_jiffies.
>
> Acked-by: Linus Walleij <linus.walleij@...aro.org>
> Signed-off-by: Fabio Baltieri <fabio.baltieri@...aro.org>
> ---
>  drivers/cpufreq/db8500-cpufreq.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/cpufreq/db8500-cpufreq.c b/drivers/cpufreq/db8500-cpufreq.c
> index 74b830b..e758891 100644
> --- a/drivers/cpufreq/db8500-cpufreq.c
> +++ b/drivers/cpufreq/db8500-cpufreq.c
> @@ -150,7 +150,7 @@ static int __cpuinit db8500_cpufreq_init(struct cpufreq_policy *policy)
>  }
>  
>  static struct cpufreq_driver db8500_cpufreq_driver = {
> -	.flags  = CPUFREQ_STICKY,
> +	.flags  = CPUFREQ_STICKY | CPUFREQ_CONST_LOOPS,
>  	.verify = db8500_cpufreq_verify_speed,
>  	.target = db8500_cpufreq_target,
>  	.get    = db8500_cpufreq_getspeed,

Wouldn't you want to fold this into the previous patch so bisection is
not broken? Otherwise you have a place where lpj is all screwed up when
cpufreq mucks with it.

-- 
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