linux-kernel - [RFCv2 PATCH 16/23] sched, cpufreq: Current compute capacity hack for ARM TC2

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Date:	Thu,  3 Jul 2014 17:26:03 +0100
From:	Morten Rasmussen <morten.rasmussen@....com>
To:	linux-kernel@...r.kernel.org, linux-pm@...r.kernel.org,
	peterz@...radead.org, mingo@...nel.org
Cc:	rjw@...ysocki.net, vincent.guittot@...aro.org,
	daniel.lezcano@...aro.org, preeti@...ux.vnet.ibm.com,
	Dietmar.Eggemann@....com, pjt@...gle.com
Subject: [RFCv2 PATCH 16/23] sched, cpufreq: Current compute capacity hack for ARM TC2

Hack to report different cpu capacities for big and little cpus.
This is for experimentation on ARM TC2 _only_. A proper solution
has to address this problem.

Signed-off-by: Morten Rasmussen <morten.rasmussen@....com>
---
 drivers/cpufreq/cpufreq.c |    8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/drivers/cpufreq/cpufreq.c b/drivers/cpufreq/cpufreq.c
index a2b788d..efec777 100644
--- a/drivers/cpufreq/cpufreq.c
+++ b/drivers/cpufreq/cpufreq.c
@@ -316,7 +316,13 @@ static void __cpufreq_notify_transition(struct cpufreq_policy *policy,
 		pr_debug("FREQ: %lu - CPU: %lu\n",
 			 (unsigned long)freqs->new, (unsigned long)freqs->cpu);
 		trace_cpu_frequency(freqs->new, freqs->cpu);
-		set_curr_capacity(freqs->cpu, (freqs->new*1024)/policy->max);
+		/* Massive TC2 hack */
+		if (freqs->cpu == 0 || freqs->cpu == 1)
+			/* A15 cpus (max_capacity = 2015) */
+			set_curr_capacity(freqs->cpu, (freqs->new*2015)/1200000);
+		else
+			/* A7 cpus (nax_capacity = 1024) */
+			set_curr_capacity(freqs->cpu, (freqs->new*1024)/1000000);
 		srcu_notifier_call_chain(&cpufreq_transition_notifier_list,
 				CPUFREQ_POSTCHANGE, freqs);
 		if (likely(policy) && likely(policy->cpu == freqs->cpu))
-- 
1.7.9.5


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