cpufreq: apple-soc: Switch to the lowest frequency on suspend

Without this, the CPUs are left in a random pstate. Since we don't
support deep idle yet (which powers down the CPUs), this results in
significantly increased idle power consumption in suspend.

Fixes: 6286bbb40576 ("cpufreq: apple-soc: Add new driver to control Apple SoC CPU P-states")
Signed-off-by: Hector Martin <marcan@marcan.st>
Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>

diff --git a/drivers/cpufreq/apple-soc-cpufreq.c b/drivers/cpufreq/apple-soc-cpufreq.c
index 6f26395..c11d22f 100644 (file)
--- a/drivers/cpufreq/apple-soc-cpufreq.c
+++ b/drivers/cpufreq/apple-soc-cpufreq.c
@@ -280,6 +280,7 @@ static int apple_soc_cpufreq_init(struct cpufreq_policy *policy)
        policy->cpuinfo.transition_latency = transition_latency;
        policy->dvfs_possible_from_any_cpu = true;
        policy->fast_switch_possible = true;
+       policy->suspend_freq = freq_table[0].frequency;
 
        if (policy_has_boost_freq(policy)) {
                ret = cpufreq_enable_boost_support();
@@ -328,6 +329,7 @@ static struct cpufreq_driver apple_soc_cpufreq_driver = {
        .fast_switch    = apple_soc_cpufreq_fast_switch,
        .register_em    = cpufreq_register_em_with_opp,
        .attr           = apple_soc_cpufreq_hw_attr,
+       .suspend        = cpufreq_generic_suspend,
 };
 
 static int __init apple_soc_cpufreq_module_init(void)