target/linux/ipq806x/patches-4.14/0055-cpufreq-dt-Add-L2-frequency-scaling-support.patch

   1 From 0759cdff49f1cf361bf503c13f7bcb33da43ab95 Mon Sep 17 00:00:00 2001
   2 From: Georgi Djakov <georgi.djakov@linaro.org>
   3 Date: Tue, 8 Sep 2015 11:24:41 +0300
   4 Subject: [PATCH 55/69] cpufreq-dt: Add L2 frequency scaling support
   5
   6 Signed-off-by: Georgi Djakov <georgi.djakov@linaro.org>
   7 ---
   8  drivers/cpufreq/cpufreq-dt.c | 41 ++++++++++++++++++++++++++++++++++++++++-
   9  include/linux/cpufreq.h      |  2 ++
  10  2 files changed, 42 insertions(+), 1 deletion(-)
  11
  12 --- a/drivers/cpufreq/cpufreq-dt.c
  13 +++ b/drivers/cpufreq/cpufreq-dt.c
  14 @@ -49,11 +49,41 @@ static int set_target(struct cpufreq_pol
  15         struct private_data *priv = policy->driver_data;
  16         int ret;
  17         unsigned long target_freq = policy->freq_table[index].frequency * 1000;
  18 +       struct clk *l2_clk = policy->l2_clk;
  19 +       unsigned int l2_freq;
  20 +       unsigned long new_l2_freq = 0;
  21
  22         mutex_lock(&priv->lock);
  23         ret = dev_pm_opp_set_rate(priv->cpu_dev, target_freq);
  24 -       if (!ret)
  25 +
  26 +       if (!ret) {
  27 +               if (!IS_ERR(l2_clk) && policy->l2_rate[0] && policy->l2_rate[1] &&
  28 +                               policy->l2_rate[2]) {
  29 +                       static unsigned long krait_l2[CONFIG_NR_CPUS] = { };
  30 +                       int cpu, ret = 0;
  31 +
  32 +                       if (target_freq >= policy->l2_rate[2])
  33 +                               new_l2_freq = policy->l2_rate[2];
  34 +                       else if (target_freq >= policy->l2_rate[1])
  35 +                               new_l2_freq = policy->l2_rate[1];
  36 +                       else
  37 +                               new_l2_freq = policy->l2_rate[0];
  38 +
  39 +                       krait_l2[policy->cpu] = new_l2_freq;
  40 +                       for_each_present_cpu(cpu)
  41 +                               new_l2_freq = max(new_l2_freq, krait_l2[cpu]);
  42 +
  43 +                       l2_freq = clk_get_rate(l2_clk);
  44 +
  45 +                       if (l2_freq != new_l2_freq) {
  46 +                               /* scale l2 with the core */
  47 +                               ret = clk_set_rate(l2_clk, new_l2_freq);
  48 +                       }
  49 +               }
  50 +
  51                 priv->opp_freq = target_freq;
  52 +       }
  53 +
  54         mutex_unlock(&priv->lock);
  55
  56         return ret;
  57 @@ -197,6 +227,8 @@ static int cpufreq_init(struct cpufreq_p
  58         const char *name;
  59         int ret;
  60         struct srcu_notifier_head *opp_srcu_head;
  61 +       struct device_node *l2_np;
  62 +       struct clk *l2_clk = NULL;
  63
  64         cpu_dev = get_cpu_device(policy->cpu);
  65         if (!cpu_dev) {
  66 @@ -305,6 +337,13 @@ static int cpufreq_init(struct cpufreq_p
  67
  68         policy->suspend_freq = dev_pm_opp_get_suspend_opp_freq(cpu_dev) / 1000;
  69
  70 +       l2_clk = clk_get(cpu_dev, "l2");
  71 +       if (!IS_ERR(l2_clk))
  72 +               policy->l2_clk = l2_clk;
  73 +       l2_np = of_find_node_by_name(NULL, "qcom,l2");
  74 +       if (l2_np)
  75 +               of_property_read_u32_array(l2_np, "qcom,l2-rates", policy->l2_rate, 3);
  76 +
  77         ret = cpufreq_table_validate_and_show(policy, freq_table);
  78         if (ret) {
  79                 dev_err(cpu_dev, "%s: invalid frequency table: %d\n", __func__,
  80 --- a/include/linux/cpufreq.h
  81 +++ b/include/linux/cpufreq.h
  82 @@ -73,6 +73,8 @@ struct cpufreq_policy {
  83         unsigned int            cpu;    /* cpu managing this policy, must be online */
  84
  85         struct clk              *clk;
  86 +       struct clk              *l2_clk; /* L2 clock */
  87 +       unsigned int            l2_rate[3]; /* L2 bus clock rate thresholds */
  88         struct cpufreq_cpuinfo  cpuinfo;/* see above */
  89
  90         unsigned int            min;    /* in kHz */