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

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Message-ID: <52842671.40703@linaro.org>
Date:	Thu, 14 Nov 2013 06:55:05 +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 Wednesday 13 November 2013 08:46 PM, Nishanth Menon wrote:
> arrgh, my bad.. Apologies for the bad one.. I missed it :( Does the following
> look equivalent?

yes.

> With this, I now see:

> [   43.212714] cpufreq: cpufreq_add_policy_cpu: Failed to stop governor
> ^^^ ??

Ahh, I missed this part. I thought it will fail at some other place where there
is no error checking :), but that's not true.

Following should fix it for you and looks to be the right way as well.


diff --git a/drivers/cpufreq/cpufreq.c b/drivers/cpufreq/cpufreq.c
index dc67fa0..30b09d3 100644
--- a/drivers/cpufreq/cpufreq.c
+++ b/drivers/cpufreq/cpufreq.c
@@ -1530,6 +1530,14 @@ static void cpufreq_bp_resume(void)
                }
        }

+       if (has_target()) {
+               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;
+               }
+       }
+
        schedule_work(&policy->update);

 fail:

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