linux-kernel - Re: [PATCH] drivers:cpufreq: Change policy->cpuinfo.transition

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Message-ID: <CAKohpokKJB9wHNQLpBNnmupLp-oLCgn2XgL_u__S-Bszy5vNKw@mail.gmail.com>
Date:	Thu, 27 Nov 2014 09:27:12 +0530
From:	Viresh Kumar <viresh.kumar@...aro.org>
To:	Nicholas Krause <xerofoify@...il.com>
Cc:	"Rafael J. Wysocki" <rjw@...ysocki.net>,
	"linux-pm@...r.kernel.org" <linux-pm@...r.kernel.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] drivers:cpufreq: Change policy->cpuinfo.transition_latency
 to correct value

On 27 November 2014 at 03:26, Nicholas Krause <xerofoify@...il.com> wrote:
> Changes policy->cpuinfo.transition_latency for 1000 to 1000000 nanoseconds
> as we are assuming the latency is 1 millisecond.
>
> Signed-off-by: Nicholas Krause <xerofoify@...il.com>
> ---
>  drivers/cpufreq/pxa2xx-cpufreq.c | 2 +-
>  drivers/cpufreq/pxa3xx-cpufreq.c | 2 +-
>  2 files changed, 2 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/cpufreq/pxa2xx-cpufreq.c b/drivers/cpufreq/pxa2xx-cpufreq.c
> index e24269a..2b894aa 100644
> --- a/drivers/cpufreq/pxa2xx-cpufreq.c
> +++ b/drivers/cpufreq/pxa2xx-cpufreq.c
> @@ -372,7 +372,7 @@ static int pxa_cpufreq_init(struct cpufreq_policy *policy)
>         init_sdram_rows();
>
>         /* set default policy and cpuinfo */
> -       policy->cpuinfo.transition_latency = 1000; /* FIXME: 1 ms, assumed */
> +       policy->cpuinfo.transition_latency = 1000000;

> -       policy->cpuinfo.transition_latency = 1000; /* FIXME: 1 ms, assumed */
> +       policy->cpuinfo.transition_latency = 1000000;

I believe the FIXMEs are still valid and shouldn't be removed. As we are still
running under the assumption here instead of finding out how much is the
latency.
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