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cpufreq: Tegra: Use cpufreq_generic_suspend()

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The cpufreq core now supports suspending and resuming of cpufreq
drivers and governors during systems suspend and resume, so use
the common infrastructure instead of defining special PM notifiers
for the same thing.

Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
Tested-by: Stephen Warren <swarren@nvidia.com>
[rjw: Changelog]
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
This commit is contained in:
Viresh Kumar 2014-03-04 11:00:30 +08:00 committed by Rafael J. Wysocki
parent 59625ba393
commit d351cb3114
1 changed files with 5 additions and 41 deletions
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46
drivers/cpufreq/tegra-cpufreq.c
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@ -26,7 +26,6 @@
#include <linux/err.h>
#include <linux/clk.h>
#include <linux/io.h>
#include <linux/suspend.h>
static struct cpufreq_frequency_table freq_table[] = {
{ .frequency = 216000 },
@ -47,9 +46,6 @@ static struct clk *pll_x_clk;
static struct clk *pll_p_clk;
static struct clk *emc_clk;
static DEFINE_MUTEX(tegra_cpu_lock);
static bool is_suspended;
static int tegra_cpu_clk_set_rate(unsigned long rate)
{
int ret;
@ -112,42 +108,9 @@ static int tegra_update_cpu_speed(struct cpufreq_policy *policy,
static int tegra_target(struct cpufreq_policy *policy, unsigned int index)
{
int ret = -EBUSY;
mutex_lock(&tegra_cpu_lock);
if (!is_suspended)
ret = tegra_update_cpu_speed(policy,
freq_table[index].frequency);
mutex_unlock(&tegra_cpu_lock);
return ret;
return tegra_update_cpu_speed(policy, freq_table[index].frequency);
}
static int tegra_pm_notify(struct notifier_block *nb, unsigned long event,
void *dummy)
{
mutex_lock(&tegra_cpu_lock);
if (event == PM_SUSPEND_PREPARE) {
struct cpufreq_policy *policy = cpufreq_cpu_get(0);
is_suspended = true;
pr_info("Tegra cpufreq suspend: setting frequency to %d kHz\n",
freq_table[0].frequency);
if (clk_get_rate(cpu_clk) / 1000 != freq_table[0].frequency)
tegra_update_cpu_speed(policy, freq_table[0].frequency);
cpufreq_cpu_put(policy);
} else if (event == PM_POST_SUSPEND) {
is_suspended = false;
}
mutex_unlock(&tegra_cpu_lock);
return NOTIFY_OK;
}
static struct notifier_block tegra_cpu_pm_notifier = {
.notifier_call = tegra_pm_notify,
};
static int tegra_cpu_init(struct cpufreq_policy *policy)
{
int ret;
@ -166,10 +129,8 @@ static int tegra_cpu_init(struct cpufreq_policy *policy)
return ret;
}
if (policy->cpu == 0)
register_pm_notifier(&tegra_cpu_pm_notifier);
policy->clk = cpu_clk;
policy->suspend_freq = freq_table[0].frequency;
return 0;
}
@ -190,6 +151,9 @@ static struct cpufreq_driver tegra_cpufreq_driver = {
.exit = tegra_cpu_exit,
.name = "tegra",
.attr = cpufreq_generic_attr,
#ifdef CONFIG_PM
.suspend = cpufreq_generic_suspend,
#endif
};
static int __init tegra_cpufreq_init(void)