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Diffstat (limited to 'target/linux/ipq806x/patches-4.4/173-cpufreq-dt-Add-L2-frequency-scaling-support.patch')
-rw-r--r--target/linux/ipq806x/patches-4.4/173-cpufreq-dt-Add-L2-frequency-scaling-support.patch161
1 files changed, 161 insertions, 0 deletions
diff --git a/target/linux/ipq806x/patches-4.4/173-cpufreq-dt-Add-L2-frequency-scaling-support.patch b/target/linux/ipq806x/patches-4.4/173-cpufreq-dt-Add-L2-frequency-scaling-support.patch
new file mode 100644
index 0000000000..56930520c9
--- /dev/null
+++ b/target/linux/ipq806x/patches-4.4/173-cpufreq-dt-Add-L2-frequency-scaling-support.patch
@@ -0,0 +1,161 @@
+From b4629f9e30e865402c643de6d4668be790fc0539 Mon Sep 17 00:00:00 2001
+From: Georgi Djakov <georgi.djakov@linaro.org>
+Date: Tue, 8 Sep 2015 11:24:41 +0300
+Subject: cpufreq-dt: Add L2 frequency scaling support
+
+Signed-off-by: Georgi Djakov <georgi.djakov@linaro.org>
+
+Conflicts:
+ drivers/cpufreq/cpufreq-dt.c
+---
+ drivers/cpufreq/cpufreq-dt.c | 54 ++++++++++++++++++++++++++++++++++++++------
+ include/linux/cpufreq.h | 2 ++
+ 2 files changed, 49 insertions(+), 7 deletions(-)
+
+--- a/drivers/cpufreq/cpufreq-dt.c
++++ b/drivers/cpufreq/cpufreq-dt.c
+@@ -86,11 +86,13 @@ static int set_target(struct cpufreq_pol
+ struct dev_pm_opp *opp;
+ struct cpufreq_frequency_table *freq_table = policy->freq_table;
+ struct clk *cpu_clk = policy->clk;
++ struct clk *l2_clk = policy->l2_clk;
+ struct private_data *priv = policy->driver_data;
+ struct device *cpu_dev = priv->cpu_dev;
+ struct regulator *cpu_reg = priv->cpu_reg;
+ unsigned long volt = 0, volt_old = 0, tol = 0;
+- unsigned int old_freq, new_freq;
++ unsigned int old_freq, new_freq, l2_freq;
++ unsigned long new_l2_freq = 0;
+ long freq_Hz, freq_exact;
+ unsigned long opp_freq = 0;
+ int ret;
+@@ -146,6 +148,30 @@ static int set_target(struct cpufreq_pol
+ goto out;
+ }
+
++ if (!IS_ERR(l2_clk) && policy->l2_rate[0] && policy->l2_rate[1] &&
++ policy->l2_rate[2]) {
++ static unsigned long krait_l2[CONFIG_NR_CPUS] = { };
++ int cpu, ret = 0;
++
++ if (freq_exact >= policy->l2_rate[2])
++ new_l2_freq = policy->l2_rate[2];
++ else if (freq_exact >= policy->l2_rate[1])
++ new_l2_freq = policy->l2_rate[1];
++ else
++ new_l2_freq = policy->l2_rate[0];
++
++ krait_l2[policy->cpu] = new_l2_freq;
++ for_each_present_cpu(cpu)
++ new_l2_freq = max(new_l2_freq, krait_l2[cpu]);
++
++ l2_freq = clk_get_rate(l2_clk);
++
++ if (l2_freq != new_l2_freq) {
++ /* scale l2 with the core */
++ ret = clk_set_rate(l2_clk, new_l2_freq);
++ }
++ }
++
+ /* scaling down? scale voltage after frequency */
+ if (!IS_ERR(cpu_reg) && new_freq < old_freq) {
+ ret = regulator_set_voltage_tol(cpu_reg, volt, tol);
+@@ -156,18 +182,21 @@ static int set_target(struct cpufreq_pol
+ goto out;
+ }
+ }
++
+ priv->opp_freq = opp_freq;
++
+ out:
+ mutex_unlock(&priv->lock);
+ return ret;
+ }
+
+ static int allocate_resources(int cpu, struct device **cdev,
+- struct regulator **creg, struct clk **cclk)
++ struct regulator **creg, struct clk **cclk,
++ struct clk **l2)
+ {
+ struct device *cpu_dev;
+ struct regulator *cpu_reg;
+- struct clk *cpu_clk;
++ struct clk *cpu_clk, *l2_clk = NULL;
+ int ret = 0;
+ char *reg_cpu0 = "cpu0", *reg_cpu = "cpu", *reg;
+
+@@ -227,6 +256,10 @@ try_again:
+ *cdev = cpu_dev;
+ *creg = cpu_reg;
+ *cclk = cpu_clk;
++
++ l2_clk = clk_get(cpu_dev, "l2");
++ if (!IS_ERR(l2_clk))
++ *l2 = l2_clk;
+ }
+
+ return ret;
+@@ -236,18 +269,20 @@ static int cpufreq_init(struct cpufreq_p
+ {
+ struct cpufreq_frequency_table *freq_table;
+ struct device_node *np;
++ struct device_node *l2_np;
+ struct private_data *priv;
+ struct device *cpu_dev;
+ struct regulator *cpu_reg;
+- struct clk *cpu_clk;
+ struct dev_pm_opp *suspend_opp;
++ struct clk *cpu_clk, *l2_clk;
+ unsigned long min_uV = ~0, max_uV = 0;
+ 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);
++ ret = allocate_resources(policy->cpu, &cpu_dev, &cpu_reg, &cpu_clk,
++ &l2_clk);
+ if (ret) {
+ pr_err("%s: Failed to allocate resources: %d\n", __func__, ret);
+ return ret;
+@@ -398,6 +433,11 @@ static int cpufreq_init(struct cpufreq_p
+ if (suspend_opp)
+ policy->suspend_freq = dev_pm_opp_get_freq(suspend_opp) / 1000;
+ rcu_read_unlock();
++ policy->l2_clk = l2_clk;
++
++ l2_np = of_find_node_by_name(NULL, "qcom,l2");
++ if (l2_np)
++ of_property_read_u32_array(l2_np, "qcom,l2-rates", policy->l2_rate, 3);
+
+ ret = cpufreq_table_validate_and_show(policy, freq_table);
+ if (ret) {
+@@ -498,7 +538,7 @@ static int dt_cpufreq_probe(struct platf
+ {
+ struct device *cpu_dev;
+ struct regulator *cpu_reg;
+- struct clk *cpu_clk;
++ struct clk *cpu_clk, *l2_clk;
+ int ret;
+
+ /*
+@@ -508,7 +548,7 @@ static int dt_cpufreq_probe(struct platf
+ *
+ * FIXME: Is checking this only for CPU0 sufficient ?
+ */
+- ret = allocate_resources(0, &cpu_dev, &cpu_reg, &cpu_clk);
++ ret = allocate_resources(0, &cpu_dev, &cpu_reg, &cpu_clk, &l2_clk);
+ if (ret)
+ return ret;
+
+--- a/include/linux/cpufreq.h
++++ b/include/linux/cpufreq.h
+@@ -67,6 +67,8 @@ struct cpufreq_policy {
+ unsigned int cpu; /* cpu managing this policy, must be online */
+
+ struct clk *clk;
++ struct clk *l2_clk; /* L2 clock */
++ unsigned int l2_rate[3]; /* L2 bus clock rate thresholds */
+ struct cpufreq_cpuinfo cpuinfo;/* see above */
+
+ unsigned int min; /* in kHz */