diff options
| -rw-r--r-- | arch/arm/mach-tegra/cpu-tegra.c | 75 |
1 files changed, 60 insertions, 15 deletions
diff --git a/arch/arm/mach-tegra/cpu-tegra.c b/arch/arm/mach-tegra/cpu-tegra.c index fea5719c7072..ad26a9f3a134 100644 --- a/arch/arm/mach-tegra/cpu-tegra.c +++ b/arch/arm/mach-tegra/cpu-tegra.c @@ -28,6 +28,7 @@ #include <linux/err.h> #include <linux/clk.h> #include <linux/io.h> +#include <linux/suspend.h> #include <asm/system.h> @@ -36,14 +37,15 @@ /* Frequency table index must be sequential starting at 0 */ static struct cpufreq_frequency_table freq_table[] = { - { 0, 312000 }, - { 1, 456000 }, - { 2, 608000 }, - { 3, 760000 }, - { 4, 816000 }, - { 5, 912000 }, - { 6, 1000000 }, - { 7, CPUFREQ_TABLE_END }, + { 0, 216000 }, + { 1, 312000 }, + { 2, 456000 }, + { 3, 608000 }, + { 4, 760000 }, + { 5, 816000 }, + { 6, 912000 }, + { 7, 1000000 }, + { 8, CPUFREQ_TABLE_END }, }; #define NUM_CPUS 2 @@ -51,6 +53,8 @@ static struct cpufreq_frequency_table freq_table[] = { static struct clk *cpu_clk; static unsigned long target_cpu_speed[NUM_CPUS]; +static DEFINE_MUTEX(tegra_cpu_lock); +static bool is_suspended; int tegra_verify_speed(struct cpufreq_policy *policy) { @@ -68,16 +72,11 @@ unsigned int tegra_getspeed(unsigned int cpu) return rate; } -static int tegra_update_cpu_speed(void) +static int tegra_update_cpu_speed(unsigned long rate) { - int i; - unsigned long rate = 0; int ret = 0; struct cpufreq_freqs freqs; - for_each_online_cpu(i) - rate = max(rate, target_cpu_speed[i]); - freqs.old = tegra_getspeed(0); freqs.new = rate; @@ -105,12 +104,30 @@ static int tegra_update_cpu_speed(void) return 0; } +static unsigned long tegra_cpu_highest_speed(void) +{ + unsigned long rate = 0; + int i; + + for_each_online_cpu(i) + rate = max(rate, target_cpu_speed[i]); + return rate; +} + static int tegra_target(struct cpufreq_policy *policy, unsigned int target_freq, unsigned int relation) { int idx; unsigned int freq; + int ret = 0; + + mutex_lock(&tegra_cpu_lock); + + if (is_suspended) { + ret = -EBUSY; + goto out; + } cpufreq_frequency_table_target(policy, freq_table, target_freq, relation, &idx); @@ -119,9 +136,34 @@ static int tegra_target(struct cpufreq_policy *policy, target_cpu_speed[policy->cpu] = freq; - return tegra_update_cpu_speed(); + ret = tegra_update_cpu_speed(tegra_cpu_highest_speed()); + +out: + mutex_unlock(&tegra_cpu_lock); + return ret; } +static int tegra_pm_notify(struct notifier_block *nb, unsigned long event, + void *dummy) +{ + mutex_lock(&tegra_cpu_lock); + if (event == PM_SUSPEND_PREPARE) { + is_suspended = true; + pr_info("Tegra cpufreq suspend: setting frequency to %d kHz\n", + freq_table[0].frequency); + tegra_update_cpu_speed(freq_table[0].frequency); + } 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) { if (policy->cpu >= NUM_CPUS) @@ -142,6 +184,9 @@ static int tegra_cpu_init(struct cpufreq_policy *policy) policy->shared_type = CPUFREQ_SHARED_TYPE_ALL; cpumask_copy(policy->related_cpus, cpu_possible_mask); + if (policy->cpu == 0) + register_pm_notifier(&tegra_cpu_pm_notifier); + return 0; } |