diff options
Diffstat (limited to 'target/linux/ipq806x/patches-4.4/172-cpufreq-dt-Handle-OPP-voltage-adjust-events.patch')
| -rw-r--r-- | target/linux/ipq806x/patches-4.4/172-cpufreq-dt-Handle-OPP-voltage-adjust-events.patch | 184 |
1 files changed, 0 insertions, 184 deletions
diff --git a/target/linux/ipq806x/patches-4.4/172-cpufreq-dt-Handle-OPP-voltage-adjust-events.patch b/target/linux/ipq806x/patches-4.4/172-cpufreq-dt-Handle-OPP-voltage-adjust-events.patch deleted file mode 100644 index 60ebe13b1b..0000000000 --- a/target/linux/ipq806x/patches-4.4/172-cpufreq-dt-Handle-OPP-voltage-adjust-events.patch +++ /dev/null @@ -1,184 +0,0 @@ -From 175329015c8a0b480240da222822d2f8316f074d Mon Sep 17 00:00:00 2001 -From: Stephen Boyd <sboyd@codeaurora.org> -Date: Mon, 1 Jun 2015 18:47:58 -0700 -Subject: 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> ---- - drivers/cpufreq/cpufreq-dt.c | 72 ++++++++++++++++++++++++++++++++++++++++---- - 1 file changed, 66 insertions(+), 6 deletions(-) - ---- a/drivers/cpufreq/cpufreq-dt.c -+++ b/drivers/cpufreq/cpufreq-dt.c -@@ -34,6 +34,9 @@ struct private_data { - struct regulator *cpu_reg; - struct thermal_cooling_device *cdev; - unsigned int voltage_tolerance; /* in percentage */ -+ struct notifier_block opp_nb; -+ struct mutex lock; -+ unsigned long opp_freq; - }; - - static struct freq_attr *cpufreq_dt_attr[] = { -@@ -42,6 +45,42 @@ static struct freq_attr *cpufreq_dt_attr - NULL, - }; - -+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 = priv->cpu_reg; -+ unsigned long volt, tol, freq; -+ int ret = 0; -+ -+ switch (event) { -+ case OPP_EVENT_ADJUST_VOLTAGE: -+ volt = dev_pm_opp_get_voltage(opp); -+ freq = dev_pm_opp_get_freq(opp); -+ tol = volt * priv->voltage_tolerance / 100; -+ -+ mutex_lock(&priv->lock); -+ if (freq == priv->opp_freq) -+ ret = regulator_set_voltage_tol(cpu_reg, volt, -+ tol); -+ mutex_unlock(&priv->lock); -+ if (ret) { -+ dev_err(cpu_dev, -+ "failed to scale voltage up: %d\n", -+ ret); -+ return ret; -+ } -+ break; -+ default: -+ break; -+ } -+ -+ return 0; -+} -+ - static int set_target(struct cpufreq_policy *policy, unsigned int index) - { - struct dev_pm_opp *opp; -@@ -53,6 +92,7 @@ static int set_target(struct cpufreq_pol - unsigned long volt = 0, volt_old = 0, tol = 0; - unsigned int old_freq, new_freq; - long freq_Hz, freq_exact; -+ unsigned long opp_freq = 0; - int ret; - - freq_Hz = clk_round_rate(cpu_clk, freq_table[index].frequency * 1000); -@@ -63,8 +103,8 @@ static int set_target(struct cpufreq_pol - new_freq = freq_Hz / 1000; - old_freq = clk_get_rate(cpu_clk) / 1000; - -+ mutex_lock(&priv->lock); - if (!IS_ERR(cpu_reg)) { -- unsigned long opp_freq; - - rcu_read_lock(); - opp = dev_pm_opp_find_freq_ceil(cpu_dev, &freq_Hz); -@@ -72,7 +112,8 @@ static int set_target(struct cpufreq_pol - rcu_read_unlock(); - dev_err(cpu_dev, "failed to find OPP for %ld\n", - freq_Hz); -- return PTR_ERR(opp); -+ ret = PTR_ERR(opp); -+ goto out; - } - volt = dev_pm_opp_get_voltage(opp); - opp_freq = dev_pm_opp_get_freq(opp); -@@ -93,7 +134,7 @@ static int set_target(struct cpufreq_pol - if (ret) { - dev_err(cpu_dev, "failed to scale voltage up: %d\n", - ret); -- return ret; -+ goto out; - } - } - -@@ -102,7 +143,7 @@ static int set_target(struct cpufreq_pol - dev_err(cpu_dev, "failed to set clock rate: %d\n", ret); - if (!IS_ERR(cpu_reg) && volt_old > 0) - regulator_set_voltage_tol(cpu_reg, volt_old, tol); -- return ret; -+ goto out; - } - - /* scaling down? scale voltage after frequency */ -@@ -112,9 +153,12 @@ static int set_target(struct cpufreq_pol - dev_err(cpu_dev, "failed to scale voltage down: %d\n", - ret); - clk_set_rate(cpu_clk, old_freq * 1000); -+ goto out; - } - } -- -+ priv->opp_freq = opp_freq; -+out: -+ mutex_unlock(&priv->lock); - return ret; - } - -@@ -201,6 +245,7 @@ static int cpufreq_init(struct cpufreq_p - unsigned int transition_latency; - bool need_update = false; - int ret; -+ struct srcu_notifier_head *opp_srcu_head; - - ret = allocate_resources(policy->cpu, &cpu_dev, &cpu_reg, &cpu_clk); - if (ret) { -@@ -277,6 +322,19 @@ static int cpufreq_init(struct cpufreq_p - goto out_free_opp; - } - -+ mutex_init(&priv->lock); -+ -+ opp_srcu_head = dev_pm_opp_get_notifier(cpu_dev); -+ if (IS_ERR(opp_srcu_head)) { -+ ret = PTR_ERR(opp_srcu_head); -+ goto out_free_priv; -+ } -+ -+ priv->opp_nb.notifier_call = opp_notifier; -+ ret = srcu_notifier_chain_register(opp_srcu_head, &priv->opp_nb); -+ if (ret) -+ goto out_free_priv; -+ - of_property_read_u32(np, "voltage-tolerance", &priv->voltage_tolerance); - - if (!transition_latency) -@@ -326,7 +384,7 @@ static int cpufreq_init(struct cpufreq_p - ret = dev_pm_opp_init_cpufreq_table(cpu_dev, &freq_table); - if (ret) { - pr_err("failed to init cpufreq table: %d\n", ret); -- goto out_free_priv; -+ goto out_unregister_nb; - } - - priv->cpu_dev = cpu_dev; -@@ -365,6 +423,8 @@ 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: |