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[POWERPC] cbe_cpufreq: Limit frequency via cpufreq notifier chain

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... 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>
This commit is contained in:
Thomas Renninger 2007-06-05 04:14:40 +10:00 committed by Paul Mackerras
parent e7c40012b8
commit 1552cb923e
1 changed files with 28 additions and 7 deletions
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35
arch/powerpc/platforms/cell/cbe_cpufreq.c
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@ -67,6 +67,7 @@ static u64 MIC_Slow_Next_Timer_table[] = {
0x00003FC000000000ull, 0x00003FC000000000ull,
}; };
static unsigned int pmi_frequency_limit = 0;
/* /*
* hardware specific functions * hardware specific functions
*/ */
@ -164,7 +165,6 @@ static int set_pmode(int cpu, unsigned int slow_mode) {
static void cbe_cpufreq_handle_pmi(struct of_device *dev, pmi_message_t pmi_msg) static void cbe_cpufreq_handle_pmi(struct of_device *dev, pmi_message_t pmi_msg)
{ {
struct cpufreq_policy policy;
u8 cpu; u8 cpu;
u8 cbe_pmode_new; u8 cbe_pmode_new;
@ -173,15 +173,27 @@ static void cbe_cpufreq_handle_pmi(struct of_device *dev, pmi_message_t pmi_msg)
cpu = cbe_node_to_cpu(pmi_msg.data1); cpu = cbe_node_to_cpu(pmi_msg.data1);
cbe_pmode_new = pmi_msg.data2; 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); pr_debug("cbe_handle_pmi: max freq=%d\n", pmi_frequency_limit);
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);
} }
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 = { static struct pmi_handler cbe_pmi_handler = {
.type = PMI_TYPE_FREQ_CHANGE, .type = PMI_TYPE_FREQ_CHANGE,
.handle_pmi_message = cbe_cpufreq_handle_pmi, .handle_pmi_message = cbe_cpufreq_handle_pmi,
@ -238,12 +250,21 @@ static int cbe_cpufreq_cpu_init(struct cpufreq_policy *policy)
cpufreq_frequency_table_get_attr(cbe_freqs, policy->cpu); 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 */ /* this ensures that policy->cpuinfo_min and policy->cpuinfo_max are set correctly */
return cpufreq_frequency_table_cpuinfo(policy, cbe_freqs); return cpufreq_frequency_table_cpuinfo(policy, cbe_freqs);
} }
static int cbe_cpufreq_cpu_exit(struct cpufreq_policy *policy) 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); cpufreq_frequency_table_put_attr(policy->cpu);
return 0; return 0;
} }