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From 0759cdff49f1cf361bf503c13f7bcb33da43ab95 Mon Sep 17 00:00:00 2001
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From: Georgi Djakov <georgi.djakov@linaro.org>
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Date: Tue, 8 Sep 2015 11:24:41 +0300
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Subject: [PATCH 55/69] cpufreq-dt: Add L2 frequency scaling support
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Signed-off-by: Georgi Djakov <georgi.djakov@linaro.org>
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---
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drivers/cpufreq/cpufreq-dt.c | 41 ++++++++++++++++++++++++++++++++++++++++-
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include/linux/cpufreq.h | 2 ++
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2 files changed, 42 insertions(+), 1 deletion(-)
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--- a/drivers/cpufreq/cpufreq-dt.c
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+++ b/drivers/cpufreq/cpufreq-dt.c
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@@ -49,11 +49,42 @@ static int set_target(struct cpufreq_pol
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struct private_data *priv = policy->driver_data;
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int ret;
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unsigned long target_freq = policy->freq_table[index].frequency * 1000;
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+ struct clk *l2_clk = policy->l2_clk;
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+ unsigned int l2_freq;
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+ unsigned long new_l2_freq = 0;
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mutex_lock(&priv->lock);
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ret = dev_pm_opp_set_rate(priv->cpu_dev, target_freq);
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- if (!ret)
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+
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+ if (!ret) {
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+ if (!IS_ERR(l2_clk) && policy->l2_rate[0] && policy->l2_rate[1] &&
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+ policy->l2_rate[2]) {
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+ static unsigned long krait_l2[CONFIG_NR_CPUS] = { };
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+ int cpu, ret = 0;
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+
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+ if (target_freq >= policy->l2_rate[2])
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+ new_l2_freq = policy->l2_rate[2];
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+ else if (target_freq >= policy->l2_rate[1])
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+ new_l2_freq = policy->l2_rate[1];
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+ else
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+ new_l2_freq = policy->l2_rate[0];
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+
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+ krait_l2[policy->cpu] = new_l2_freq;
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+ for_each_present_cpu(cpu)
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+ new_l2_freq = max(new_l2_freq, krait_l2[cpu]);
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+
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+ l2_freq = clk_get_rate(l2_clk);
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+
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+ if (l2_freq != new_l2_freq) {
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+ ret = clk_set_rate(l2_clk, policy->l2_rate[0]);
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+ /* scale l2 with the core */
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+ ret = clk_set_rate(l2_clk, new_l2_freq);
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+ }
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+ }
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+
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priv->opp_freq = target_freq;
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+ }
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+
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mutex_unlock(&priv->lock);
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return ret;
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@@ -197,6 +227,8 @@ static int cpufreq_init(struct cpufreq_p
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const char *name;
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int ret;
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struct srcu_notifier_head *opp_srcu_head;
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+ struct device_node *l2_np;
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+ struct clk *l2_clk = NULL;
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cpu_dev = get_cpu_device(policy->cpu);
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if (!cpu_dev) {
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@@ -305,6 +337,13 @@ static int cpufreq_init(struct cpufreq_p
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policy->suspend_freq = dev_pm_opp_get_suspend_opp_freq(cpu_dev) / 1000;
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+ l2_clk = clk_get(cpu_dev, "l2");
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+ if (!IS_ERR(l2_clk))
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+ policy->l2_clk = l2_clk;
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+ l2_np = of_find_node_by_name(NULL, "qcom,l2");
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+ if (l2_np)
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+ of_property_read_u32_array(l2_np, "qcom,l2-rates", policy->l2_rate, 3);
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+
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ret = cpufreq_table_validate_and_show(policy, freq_table);
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if (ret) {
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dev_err(cpu_dev, "%s: invalid frequency table: %d\n", __func__,
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--- a/include/linux/cpufreq.h
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+++ b/include/linux/cpufreq.h
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@@ -73,6 +73,8 @@ struct cpufreq_policy {
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unsigned int cpu; /* cpu managing this policy, must be online */
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struct clk *clk;
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+ struct clk *l2_clk; /* L2 clock */
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+ unsigned int l2_rate[3]; /* L2 bus clock rate thresholds */
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struct cpufreq_cpuinfo cpuinfo;/* see above */
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unsigned int min; /* in kHz */
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