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path: root/drivers/cpufreq/powernv-cpufreq.c
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Diffstat (limited to 'drivers/cpufreq/powernv-cpufreq.c')
-rw-r--r--drivers/cpufreq/powernv-cpufreq.c20
1 files changed, 16 insertions, 4 deletions
diff --git a/drivers/cpufreq/powernv-cpufreq.c b/drivers/cpufreq/powernv-cpufreq.c
index 54edaec1e608..bf6519cf64bc 100644
--- a/drivers/cpufreq/powernv-cpufreq.c
+++ b/drivers/cpufreq/powernv-cpufreq.c
@@ -758,8 +758,13 @@ static int powernv_cpufreq_target_index(struct cpufreq_policy *policy,
cur_msec = jiffies_to_msecs(get_jiffies_64());
- spin_lock(&gpstates->gpstate_lock);
freq_data.pstate_id = idx_to_pstate(new_index);
+ if (!gpstates) {
+ freq_data.gpstate_id = freq_data.pstate_id;
+ goto no_gpstate;
+ }
+
+ spin_lock(&gpstates->gpstate_lock);
if (!gpstates->last_sampled_time) {
gpstate_idx = new_index;
@@ -809,6 +814,7 @@ gpstates_done:
spin_unlock(&gpstates->gpstate_lock);
+no_gpstate:
/*
* Use smp_call_function to send IPI and execute the
* mtspr on target CPU. We could do that without IPI
@@ -843,6 +849,13 @@ static int powernv_cpufreq_cpu_init(struct cpufreq_policy *policy)
kernfs_put(kn);
}
+ policy->freq_table = powernv_freqs;
+ policy->fast_switch_possible = true;
+
+ if (pvr_version_is(PVR_POWER9))
+ return 0;
+
+ /* Initialise Gpstate ramp-down timer only on POWER8 */
gpstates = kzalloc(sizeof(*gpstates), GFP_KERNEL);
if (!gpstates)
return -ENOMEM;
@@ -857,8 +870,6 @@ static int powernv_cpufreq_cpu_init(struct cpufreq_policy *policy)
msecs_to_jiffies(GPSTATE_TIMER_INTERVAL);
spin_lock_init(&gpstates->gpstate_lock);
- policy->freq_table = powernv_freqs;
- policy->fast_switch_possible = true;
return 0;
}
@@ -998,7 +1009,8 @@ static void powernv_cpufreq_stop_cpu(struct cpufreq_policy *policy)
freq_data.pstate_id = idx_to_pstate(powernv_pstate_info.min);
freq_data.gpstate_id = idx_to_pstate(powernv_pstate_info.min);
smp_call_function_single(policy->cpu, set_pstate, &freq_data, 1);
- del_timer_sync(&gpstates->timer);
+ if (gpstates)
+ del_timer_sync(&gpstates->timer);
}
static unsigned int powernv_fast_switch(struct cpufreq_policy *policy,