@@ -42,6 +42,9 @@
#define VERY_HI_RATE 900000000
static struct cpufreq_frequency_table *freq_table;
+static int freq_table_users;
+static DEFINE_MUTEX(freq_table_lock);
+
static struct clk *mpu_clk;
static int omap_verify_speed(struct cpufreq_policy *policy)
@@ -172,6 +175,18 @@ skip_lpj:
return ret;
}
+static void freq_table_free(void)
+{
+ if (!freq_table_users)
+ return;
+ freq_table_users--;
+ if (freq_table_users)
+ return;
+ clk_exit_cpufreq_table(&freq_table);
+ kfree(freq_table);
+ freq_table = NULL;
+}
+
static int __cpuinit omap_cpu_init(struct cpufreq_policy *policy)
{
int result = 0;
@@ -199,14 +214,18 @@ static int __cpuinit omap_cpu_init(struct cpufreq_policy *policy)
return -EINVAL;
}
+ mutex_lock(&freq_table_lock);
/*
* if we dont get cpufreq table using opp, use traditional omap2 lookup
* as a fallback
*/
- if (opp_init_cpufreq_table(mpu_dev, &freq_table))
- clk_init_cpufreq_table(&freq_table);
+ if (!freq_table) {
+ if (opp_init_cpufreq_table(mpu_dev, &freq_table))
+ clk_init_cpufreq_table(&freq_table);
+ }
if (freq_table) {
+ freq_table_users++;
result = cpufreq_frequency_table_cpuinfo(policy, freq_table);
if (!result) {
cpufreq_frequency_table_get_attr(freq_table,
@@ -215,10 +234,10 @@ static int __cpuinit omap_cpu_init(struct cpufreq_policy *policy)
clk_exit_cpufreq_table(&freq_table);
WARN(true, "%s: fallback to clk_round(freq_table=%d)\n",
__func__, result);
- kfree(freq_table);
- freq_table = NULL;
+ freq_table_free();
}
}
+ mutex_unlock(&freq_table_lock);
if (!freq_table) {
policy->cpuinfo.min_freq = clk_round_rate(mpu_clk, 0) / 1000;
@@ -251,9 +270,9 @@ static int __cpuinit omap_cpu_init(struct cpufreq_policy *policy)
static int omap_cpu_exit(struct cpufreq_policy *policy)
{
- clk_exit_cpufreq_table(&freq_table);
- kfree(freq_table);
- freq_table = NULL;
+ mutex_lock(&freq_table_lock);
+ freq_table_free();
+ mutex_unlock(&freq_table_lock);
clk_put(mpu_clk);
return 0;
}
Since we have two cpus the cpuinit call for cpu1 causes freq_table of cpu0 to be overwritten. instead, we maintain a counter to keep track of cpus who use the cpufreq table allocate it once(one freq table for all CPUs) and free them once the last user is done with it. Signed-off-by: Nishanth Menon <nm@ti.com> --- arch/arm/mach-omap2/omap2plus-cpufreq.c | 33 ++++++++++++++++++++++++------ 1 files changed, 26 insertions(+), 7 deletions(-)