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- From 0759cdff49f1cf361bf503c13f7bcb33da43ab95 Mon Sep 17 00:00:00 2001
- From: Georgi Djakov <[email protected]>
- 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 <[email protected]>
- ---
- 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 */
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