linux-kernel - Re: [PATCH V4 2/3] cpufreq: add support for intermediate (stable) frequencies

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Message-ID: <CAD=FV=WpYRHaydJnu-+Be9V5ab2qLrA7Wz-9Z_QaG97XJhrhfg@mail.gmail.com>
Date:	Wed, 28 May 2014 12:40:47 -0700
From:	Doug Anderson <dianders@...omium.org>
To:	Viresh Kumar <viresh.kumar@...aro.org>
Cc:	"Rafael J. Wysocki" <rjw@...ysocki.net>,
	Lists linaro-kernel <linaro-kernel@...ts.linaro.org>,
	"linux-pm@...r.kernel.org" <linux-pm@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Arvind Chauhan <arvind.chauhan@....com>,
	Stephen Warren <swarren@...dia.com>,
	Russell King <linux@....linux.org.uk>,
	Nicolas Pitre <nicolas.pitre@...aro.org>,
	Thomas Abraham <thomas.abraham@...aro.org>,
	Peter De Schrijver <pdeschrijver@...dia.com>
Subject: Re: [PATCH V4 2/3] cpufreq: add support for intermediate (stable) frequencies

Viresh,

On Wed, May 21, 2014 at 1:59 AM, Viresh Kumar <viresh.kumar@...aro.org> wrote:
> @@ -1841,9 +1876,23 @@ static int __target_index(struct cpufreq_policy *policy,
>                 pr_err("%s: Failed to change cpu frequency: %d\n", __func__,
>                        retval);
>
> -       if (notify)
> +       if (notify) {
>                 cpufreq_freq_transition_end(policy, &freqs, retval);
>
> +               /*
> +                * Failed after setting to intermediate freq? Driver should have
> +                * reverted back to initial frequency and so should we. Check
> +                * here for intermediate_freq instead of get_intermediate, in
> +                * case we have't switched to intermediate freq at all.
> +                */
> +               if (unlikely(retval && intermediate_freq)) {
> +                       freqs.old = intermediate_freq;
> +                       freqs.new = policy->restore_freq;
> +                       cpufreq_freq_transition_begin(policy, &freqs);
> +                       cpufreq_freq_transition_end(policy, &freqs, retval);

As far as I can tell this notification says "I tried to switch from
"intermediate_freq" to "policy->restore_freq" but I failed, so I'm
still at "intermediate_freq".  I think you probably want to pass 0 as
the last argument to cpufreq_freq_transition_end() to fix...


Other than that this looks good to me.  I'll do a final review when
you spin the next version (since I think you need to fix stuff for
Stephen too).  I'll probably wait and re-review the Tegra version when
you and Stephen come to a consensus on it.

-Doug
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