[POWERPC] cbe_cpufreq: Limit frequency via cpufreq notifier chain
... and get rid of cpufreq_set_policy call that caused a build
failure due interfering commits.
Signed-off-by: Thomas Renninger <trenn@suse.de>
Signed-off-by: Christian Krafft <krafft@de.ibm.com>
Signed-off-by: Arnd Bergmann <arnd.bergmann@de.ibm.com>
Signed-off-by: Paul Mackerras <paulus@samba.org>
diff --git a/arch/powerpc/platforms/cell/cbe_cpufreq.c b/arch/powerpc/platforms/cell/cbe_cpufreq.c
index f9ac3fe..ac445998 100644
--- a/arch/powerpc/platforms/cell/cbe_cpufreq.c
+++ b/arch/powerpc/platforms/cell/cbe_cpufreq.c
@@ -67,6 +67,7 @@
0x00003FC000000000ull,
};
+static unsigned int pmi_frequency_limit = 0;
/*
* hardware specific functions
*/
@@ -164,7 +165,6 @@
static void cbe_cpufreq_handle_pmi(struct of_device *dev, pmi_message_t pmi_msg)
{
- struct cpufreq_policy policy;
u8 cpu;
u8 cbe_pmode_new;
@@ -173,15 +173,27 @@
cpu = cbe_node_to_cpu(pmi_msg.data1);
cbe_pmode_new = pmi_msg.data2;
- cpufreq_get_policy(&policy, cpu);
+ pmi_frequency_limit = cbe_freqs[cbe_pmode_new].frequency;
- policy.max = min(policy.max, cbe_freqs[cbe_pmode_new].frequency);
- policy.min = min(policy.min, policy.max);
-
- pr_debug("cbe_handle_pmi: new policy.min=%d policy.max=%d\n", policy.min, policy.max);
- cpufreq_set_policy(&policy);
+ pr_debug("cbe_handle_pmi: max freq=%d\n", pmi_frequency_limit);
}
+static int pmi_notifier(struct notifier_block *nb,
+ unsigned long event, void *data)
+{
+ struct cpufreq_policy *policy = data;
+
+ if (event != CPUFREQ_INCOMPATIBLE)
+ return 0;
+
+ cpufreq_verify_within_limits(policy, 0, pmi_frequency_limit);
+ return 0;
+}
+
+static struct notifier_block pmi_notifier_block = {
+ .notifier_call = pmi_notifier,
+};
+
static struct pmi_handler cbe_pmi_handler = {
.type = PMI_TYPE_FREQ_CHANGE,
.handle_pmi_message = cbe_cpufreq_handle_pmi,
@@ -238,12 +250,21 @@
cpufreq_frequency_table_get_attr(cbe_freqs, policy->cpu);
+ if (pmi_dev) {
+ /* frequency might get limited later, initialize limit with max_freq */
+ pmi_frequency_limit = max_freq;
+ cpufreq_register_notifier(&pmi_notifier_block, CPUFREQ_POLICY_NOTIFIER);
+ }
+
/* this ensures that policy->cpuinfo_min and policy->cpuinfo_max are set correctly */
return cpufreq_frequency_table_cpuinfo(policy, cbe_freqs);
}
static int cbe_cpufreq_cpu_exit(struct cpufreq_policy *policy)
{
+ if (pmi_dev)
+ cpufreq_unregister_notifier(&pmi_notifier_block, CPUFREQ_POLICY_NOTIFIER);
+
cpufreq_frequency_table_put_attr(policy->cpu);
return 0;
}
