ipq806x: copy files from 4.14 to 4.19

[openwrt/staging/ynezz.git] / target / linux / ipq806x / patches-4.19 / 0055-cpufreq-dt-Add-L2-frequency-scaling-support.patch

diff --git a/target/linux/ipq806x/patches-4.19/0055-cpufreq-dt-Add-L2-frequency-scaling-support.patch b/target/linux/ipq806x/patches-4.19/0055-cpufreq-dt-Add-L2-frequency-scaling-support.patch
new file mode 100644 (file)
index 0000000..1c26650
--- /dev/null
+++ b/target/linux/ipq806x/patches-4.19/0055-cpufreq-dt-Add-L2-frequency-scaling-support.patch
@@ -0,0 +1,90 @@
+From 0759cdff49f1cf361bf503c13f7bcb33da43ab95 Mon Sep 17 00:00:00 2001
+From: Georgi Djakov <georgi.djakov@linaro.org>
+Date: Tue, 8 Sep 2015 11:24:41 +0300
+Subject: [PATCH 55/69] cpufreq-dt: Add L2 frequency scaling support
+
+Signed-off-by: Georgi Djakov <georgi.djakov@linaro.org>
+---
+ drivers/cpufreq/cpufreq-dt.c | 41 ++++++++++++++++++++++++++++++++++++++++-
+ include/linux/cpufreq.h      |  2 ++
+ 2 files changed, 42 insertions(+), 1 deletion(-)
+
+--- a/drivers/cpufreq/cpufreq-dt.c
++++ b/drivers/cpufreq/cpufreq-dt.c
+@@ -49,11 +49,41 @@ static int set_target(struct cpufreq_pol
+       struct private_data *priv = policy->driver_data;
+       int ret;
+       unsigned long target_freq = policy->freq_table[index].frequency * 1000;
++      struct clk *l2_clk = policy->l2_clk;
++      unsigned int l2_freq;
++      unsigned long new_l2_freq = 0;
+ 
+       mutex_lock(&priv->lock);
+       ret = dev_pm_opp_set_rate(priv->cpu_dev, target_freq);
+-      if (!ret)
++
++      if (!ret) {
++              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 (target_freq >= policy->l2_rate[2])
++                              new_l2_freq = policy->l2_rate[2];
++                      else if (target_freq >= 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);
++                      }
++              }
++
+               priv->opp_freq = target_freq;
++      }
++
+       mutex_unlock(&priv->lock);
+ 
+       return ret;
+@@ -197,6 +227,8 @@ static int cpufreq_init(struct cpufreq_p
+       const char *name;
+       int ret;
+       struct srcu_notifier_head *opp_srcu_head;
++      struct device_node *l2_np;
++      struct clk *l2_clk = NULL;
+ 
+       cpu_dev = get_cpu_device(policy->cpu);
+       if (!cpu_dev) {
+@@ -305,6 +337,13 @@ static int cpufreq_init(struct cpufreq_p
+ 
+       policy->suspend_freq = dev_pm_opp_get_suspend_opp_freq(cpu_dev) / 1000;
+ 
++      l2_clk = clk_get(cpu_dev, "l2");
++      if (!IS_ERR(l2_clk))
++              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) {
+               dev_err(cpu_dev, "%s: invalid frequency table: %d\n", __func__,
+--- a/include/linux/cpufreq.h
++++ b/include/linux/cpufreq.h
+@@ -73,6 +73,8 @@ 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 */