diff options
Diffstat (limited to 'target/linux/ipq806x/patches-4.9/0054-cpufreq-dt-Handle-OPP-voltage-adjust-events.patch')
| -rw-r--r-- | target/linux/ipq806x/patches-4.9/0054-cpufreq-dt-Handle-OPP-voltage-adjust-events.patch | 144 |
1 files changed, 0 insertions, 144 deletions
diff --git a/target/linux/ipq806x/patches-4.9/0054-cpufreq-dt-Handle-OPP-voltage-adjust-events.patch b/target/linux/ipq806x/patches-4.9/0054-cpufreq-dt-Handle-OPP-voltage-adjust-events.patch deleted file mode 100644 index 7cd6c6b..0000000 --- a/target/linux/ipq806x/patches-4.9/0054-cpufreq-dt-Handle-OPP-voltage-adjust-events.patch +++ /dev/null @@ -1,144 +0,0 @@ -From 10577f74c35bd395951d1b2382c8d821089b5745 Mon Sep 17 00:00:00 2001 -From: Stephen Boyd <sboyd@codeaurora.org> -Date: Fri, 18 Sep 2015 17:52:08 -0700 -Subject: [PATCH 54/69] cpufreq-dt: Handle OPP voltage adjust events - -On some SoCs the Adaptive Voltage Scaling (AVS) technique is -employed to optimize the operating voltage of a device. At a -given frequency, the hardware monitors dynamic factors and either -makes a suggestion for how much to adjust a voltage for the -current frequency, or it automatically adjusts the voltage -without software intervention. - -In the former case, an AVS driver will call -dev_pm_opp_modify_voltage() and update the voltage for the -particular OPP the CPUs are using. Add an OPP notifier to -cpufreq-dt so that we can adjust the voltage of the CPU when AVS -updates the OPP. - -Signed-off-by: Stephen Boyd <sboyd@codeaurora.org> -Acked-by: Viresh Kumar <viresh.kumar@linaro.org> -Signed-off-by: Georgi Djakov <georgi.djakov@linaro.org> ---- - drivers/cpufreq/cpufreq-dt.c | 68 ++++++++++++++++++++++++++++++++++++++++++-- - 1 file changed, 65 insertions(+), 3 deletions(-) - ---- a/drivers/cpufreq/cpufreq-dt.c -+++ b/drivers/cpufreq/cpufreq-dt.c -@@ -32,6 +32,9 @@ struct private_data { - struct device *cpu_dev; - struct thermal_cooling_device *cdev; - const char *reg_name; -+ struct notifier_block opp_nb; -+ struct mutex lock; -+ unsigned long opp_freq; - }; - - static struct freq_attr *cpufreq_dt_attr[] = { -@@ -43,9 +46,16 @@ static struct freq_attr *cpufreq_dt_attr - static int set_target(struct cpufreq_policy *policy, unsigned int index) - { - struct private_data *priv = policy->driver_data; -+ int ret; -+ unsigned long target_freq = policy->freq_table[index].frequency * 1000; -+ -+ mutex_lock(&priv->lock); -+ ret = dev_pm_opp_set_rate(priv->cpu_dev, target_freq); -+ if (!ret) -+ priv->opp_freq = target_freq; -+ mutex_unlock(&priv->lock); - -- return dev_pm_opp_set_rate(priv->cpu_dev, -- policy->freq_table[index].frequency * 1000); -+ return ret; - } - - /* -@@ -86,6 +96,39 @@ node_put: - return name; - } - -+static int opp_notifier(struct notifier_block *nb, unsigned long event, -+ void *data) -+{ -+ struct dev_pm_opp *opp = data; -+ struct private_data *priv = container_of(nb, struct private_data, -+ opp_nb); -+ struct device *cpu_dev = priv->cpu_dev; -+ struct regulator *cpu_reg; -+ unsigned long volt, freq; -+ int ret = 0; -+ -+ if (event == OPP_EVENT_ADJUST_VOLTAGE) { -+ cpu_reg = dev_pm_opp_get_regulator(cpu_dev); -+ if (IS_ERR(cpu_reg)) { -+ ret = PTR_ERR(cpu_reg); -+ goto out; -+ } -+ volt = dev_pm_opp_get_voltage(opp); -+ freq = dev_pm_opp_get_freq(opp); -+ -+ mutex_lock(&priv->lock); -+ if (freq == priv->opp_freq) { -+ ret = regulator_set_voltage_triplet(cpu_reg, volt, volt, volt); -+ } -+ mutex_unlock(&priv->lock); -+ if (ret) -+ dev_err(cpu_dev, "failed to scale voltage: %d\n", ret); -+ } -+ -+out: -+ return notifier_from_errno(ret); -+} -+ - static int resources_available(void) - { - struct device *cpu_dev; -@@ -153,6 +196,7 @@ static int cpufreq_init(struct cpufreq_p - bool fallback = false; - const char *name; - int ret; -+ struct srcu_notifier_head *opp_srcu_head; - - cpu_dev = get_cpu_device(policy->cpu); - if (!cpu_dev) { -@@ -242,13 +286,29 @@ static int cpufreq_init(struct cpufreq_p - goto out_free_opp; - } - -+ mutex_init(&priv->lock); -+ -+ rcu_read_lock(); -+ opp_srcu_head = dev_pm_opp_get_notifier(cpu_dev); -+ if (IS_ERR(opp_srcu_head)) { -+ ret = PTR_ERR(opp_srcu_head); -+ rcu_read_unlock(); -+ goto out_free_priv; -+ } -+ -+ priv->opp_nb.notifier_call = opp_notifier; -+ ret = srcu_notifier_chain_register(opp_srcu_head, &priv->opp_nb); -+ rcu_read_unlock(); -+ if (ret) -+ goto out_free_priv; -+ - priv->reg_name = name; - priv->opp_table = opp_table; - - ret = dev_pm_opp_init_cpufreq_table(cpu_dev, &freq_table); - if (ret) { - dev_err(cpu_dev, "failed to init cpufreq table: %d\n", ret); -- goto out_free_priv; -+ goto out_unregister_nb; - } - - priv->cpu_dev = cpu_dev; -@@ -287,6 +347,8 @@ static int cpufreq_init(struct cpufreq_p - - out_free_cpufreq_table: - dev_pm_opp_free_cpufreq_table(cpu_dev, &freq_table); -+out_unregister_nb: -+ srcu_notifier_chain_unregister(opp_srcu_head, &priv->opp_nb); - out_free_priv: - kfree(priv); - out_free_opp: |