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authorStephen Boyd <sboyd@codeaurora.org>2016-11-30 16:21:25 +0530
committerRafael J. Wysocki <rafael.j.wysocki@intel.com>2016-11-30 22:41:28 +0100
commit91291d9ad92faa65a56a9a19d658d8049b78d3d4 (patch)
tree85aaf772e49e3663b1595fc21b57f93c61834ffd /drivers/cpufreq
parent349aa92e81bd14552d8d2335aff490f306038603 (diff)
downloadlinux-91291d9ad92faa65a56a9a19d658d8049b78d3d4.tar.bz2
PM / OPP: Pass opp_table to dev_pm_opp_put_regulator()
Joonyoung Shim reported an interesting problem on his ARM octa-core Odoroid-XU3 platform. During system suspend, dev_pm_opp_put_regulator() was failing for a struct device for which dev_pm_opp_set_regulator() is called earlier. This happened because an earlier call to dev_pm_opp_of_cpumask_remove_table() function (from cpufreq-dt.c file) removed all the entries from opp_table->dev_list apart from the last CPU device in the cpumask of CPUs sharing the OPP. But both dev_pm_opp_set_regulator() and dev_pm_opp_put_regulator() routines get CPU device for the first CPU in the cpumask. And so the OPP core failed to find the OPP table for the struct device. This patch attempts to fix this problem by returning a pointer to the opp_table from dev_pm_opp_set_regulator() and using that as the parameter to dev_pm_opp_put_regulator(). This ensures that the dev_pm_opp_put_regulator() doesn't fail to find the opp table. Note that similar design problem also exists with other dev_pm_opp_put_*() APIs, but those aren't used currently by anyone and so we don't need to update them for now. Cc: 4.4+ <stable@vger.kernel.org> # 4.4+ Reported-by: Joonyoung Shim <jy0922.shim@samsung.com> Signed-off-by: Stephen Boyd <sboyd@codeaurora.org> Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org> [ Viresh: Wrote commit log and tested on exynos 5250 ] Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Diffstat (limited to 'drivers/cpufreq')
-rw-r--r--drivers/cpufreq/cpufreq-dt.c12
1 files changed, 8 insertions, 4 deletions
diff --git a/drivers/cpufreq/cpufreq-dt.c b/drivers/cpufreq/cpufreq-dt.c
index 5c07ae05d69a..4d3ec92cbabf 100644
--- a/drivers/cpufreq/cpufreq-dt.c
+++ b/drivers/cpufreq/cpufreq-dt.c
@@ -28,6 +28,7 @@
#include "cpufreq-dt.h"
struct private_data {
+ struct opp_table *opp_table;
struct device *cpu_dev;
struct thermal_cooling_device *cdev;
const char *reg_name;
@@ -143,6 +144,7 @@ static int resources_available(void)
static int cpufreq_init(struct cpufreq_policy *policy)
{
struct cpufreq_frequency_table *freq_table;
+ struct opp_table *opp_table = NULL;
struct private_data *priv;
struct device *cpu_dev;
struct clk *cpu_clk;
@@ -186,8 +188,9 @@ static int cpufreq_init(struct cpufreq_policy *policy)
*/
name = find_supply_name(cpu_dev);
if (name) {
- ret = dev_pm_opp_set_regulator(cpu_dev, name);
- if (ret) {
+ opp_table = dev_pm_opp_set_regulator(cpu_dev, name);
+ if (IS_ERR(opp_table)) {
+ ret = PTR_ERR(opp_table);
dev_err(cpu_dev, "Failed to set regulator for cpu%d: %d\n",
policy->cpu, ret);
goto out_put_clk;
@@ -237,6 +240,7 @@ static int cpufreq_init(struct cpufreq_policy *policy)
}
priv->reg_name = name;
+ priv->opp_table = opp_table;
ret = dev_pm_opp_init_cpufreq_table(cpu_dev, &freq_table);
if (ret) {
@@ -285,7 +289,7 @@ out_free_priv:
out_free_opp:
dev_pm_opp_of_cpumask_remove_table(policy->cpus);
if (name)
- dev_pm_opp_put_regulator(cpu_dev);
+ dev_pm_opp_put_regulator(opp_table);
out_put_clk:
clk_put(cpu_clk);
@@ -300,7 +304,7 @@ static int cpufreq_exit(struct cpufreq_policy *policy)
dev_pm_opp_free_cpufreq_table(priv->cpu_dev, &policy->freq_table);
dev_pm_opp_of_cpumask_remove_table(policy->related_cpus);
if (priv->reg_name)
- dev_pm_opp_put_regulator(priv->cpu_dev);
+ dev_pm_opp_put_regulator(priv->opp_table);
clk_put(policy->clk);
kfree(priv);