linux-kernel - Re: [RFC PATCH] cpufreq: cpufreq-cpu0: do not allow transitions with regulators suspended

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Date:	Thu, 14 Nov 2013 22:16:00 +0530
From:	viresh kumar <viresh.kumar@...aro.org>
To:	Nishanth Menon <nm@...com>
CC:	"Rafael J. Wysocki" <rjw@...ysocki.net>,
	"cpufreq@...r.kernel.org" <cpufreq@...r.kernel.org>,
	"linux-pm@...r.kernel.org" <linux-pm@...r.kernel.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Shawn Guo <shawn.guo@...aro.org>
Subject: Re: [RFC PATCH] cpufreq: cpufreq-cpu0: do not allow transitions with
 regulators suspended

On Thursday 14 November 2013 07:57 PM, Nishanth Menon wrote:
> I am guessing this is a little too early for restarting policy here
> considering syscore_ops->resume is pretty early..

Yeah, looks like that..

> http://pastebin.mozilla.org/3602746 is the equivalent patch for v3.12
> http://pastebin.mozilla.org/3602747 is the result.

Can you try this instead of last diff I sent?


diff --git a/drivers/cpufreq/cpufreq.c b/drivers/cpufreq/cpufreq.c
index dc67fa0..e70e906 100644
--- a/drivers/cpufreq/cpufreq.c
+++ b/drivers/cpufreq/cpufreq.c
@@ -1324,6 +1324,15 @@ static void handle_update(struct work_struct *work)
                container_of(work, struct cpufreq_policy, update);
        unsigned int cpu = policy->cpu;
        pr_debug("handle_update for cpu %u called\n", cpu);
+
+       if (has_target() && !policy->governor_enabled) {
+               if ((ret = __cpufreq_governor(policy, CPUFREQ_GOV_START)) ||
+                       (ret = __cpufreq_governor(policy, CPUFREQ_GOV_LIMITS))) {
+                       pr_err("%s: Failed to start governor\n", __func__);
+                       goto fail;
+               }
+       }
+
        cpufreq_update_policy(cpu);
 }


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