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From: Stephen Boyd <sboyd@codeaurora.org>
To: Fabio Baltieri <fabio.baltieri@linaro.org>
Cc: Arnd Bergmann <arnd@arndb.de>,
	linux-pm@vger.kernel.org, John Stultz <johnstul@us.ibm.com>,
	Linus Walleij <linus.walleij@linaro.org>,
	linux-kernel@vger.kernel.org, cpufreq@vger.kernel.org,
	"Rafael J. Wysocki" <rjw@sisk.pl>,
	Thomas Gleixner <tglx@linutronix.de>,
	linux-arm-kernel@lists.infradead.org
Subject: Re: [PATCH 2/2] cpufreq: db8500: set CPUFREQ_CONST_LOOPS
Date: Mon, 17 Dec 2012 10:24:15 -0800	[thread overview]
Message-ID: <50CF634F.1040708@codeaurora.org> (raw)
In-Reply-To: <1354615845-2758-3-git-send-email-fabio.baltieri@linaro.org>

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@linaro.org>
> Signed-off-by: Fabio Baltieri <fabio.baltieri@linaro.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.

-- 
Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum,
hosted by The Linux Foundation

WARNING: multiple messages have this Message-ID (diff)
From: sboyd@codeaurora.org (Stephen Boyd)
To: linux-arm-kernel@lists.infradead.org
Subject: [PATCH 2/2] cpufreq: db8500: set CPUFREQ_CONST_LOOPS
Date: Mon, 17 Dec 2012 10:24:15 -0800	[thread overview]
Message-ID: <50CF634F.1040708@codeaurora.org> (raw)
In-Reply-To: <1354615845-2758-3-git-send-email-fabio.baltieri@linaro.org>

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@linaro.org>
> Signed-off-by: Fabio Baltieri <fabio.baltieri@linaro.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.

-- 
Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum,
hosted by The Linux Foundation

WARNING: multiple messages have this Message-ID (diff)
From: Stephen Boyd <sboyd@codeaurora.org>
To: Fabio Baltieri <fabio.baltieri@linaro.org>
Cc: John Stultz <johnstul@us.ibm.com>, Arnd Bergmann <arnd@arndb.de>,
	Thomas Gleixner <tglx@linutronix.de>,
	"Rafael J. Wysocki" <rjw@sisk.pl>,
	linux-pm@vger.kernel.org,
	Linus Walleij <linus.walleij@linaro.org>,
	linux-kernel@vger.kernel.org, cpufreq@vger.kernel.org,
	linux-arm-kernel@lists.infradead.org
Subject: Re: [PATCH 2/2] cpufreq: db8500: set CPUFREQ_CONST_LOOPS
Date: Mon, 17 Dec 2012 10:24:15 -0800	[thread overview]
Message-ID: <50CF634F.1040708@codeaurora.org> (raw)
In-Reply-To: <1354615845-2758-3-git-send-email-fabio.baltieri@linaro.org>

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@linaro.org>
> Signed-off-by: Fabio Baltieri <fabio.baltieri@linaro.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.

-- 
Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum,
hosted by The Linux Foundation


  reply	other threads:[~2012-12-17 18:24 UTC|newest]

Thread overview: 22+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2012-12-04 10:10 [PATCH 0/2] clocksource: nomadik-mtu: support timer-based delay Fabio Baltieri
2012-12-04 10:10 ` Fabio Baltieri
2012-12-04 10:10 ` [PATCH 1/2] " Fabio Baltieri
2012-12-04 10:10   ` Fabio Baltieri
2012-12-04 10:10   ` Fabio Baltieri
2012-12-04 10:10 ` [PATCH 2/2] cpufreq: db8500: set CPUFREQ_CONST_LOOPS Fabio Baltieri
2012-12-04 10:10   ` Fabio Baltieri
2012-12-17 18:24   ` Stephen Boyd [this message]
2012-12-17 18:24     ` Stephen Boyd
2012-12-17 18:24     ` Stephen Boyd
2012-12-17 22:03     ` Fabio Baltieri
2012-12-17 22:03       ` Fabio Baltieri
2012-12-17 11:36 ` [PATCH 0/2] clocksource: nomadik-mtu: support timer-based delay Fabio Baltieri
2012-12-17 11:36   ` Fabio Baltieri
2012-12-17 18:38   ` Linus Walleij
2012-12-17 18:38     ` Linus Walleij
2012-12-17 18:59     ` John Stultz
2012-12-17 18:59       ` John Stultz
2012-12-19 15:34       ` Linus Walleij
2012-12-19 15:34         ` Linus Walleij
2012-12-19 16:18         ` John Stultz
2012-12-19 16:18           ` John Stultz

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