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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 +49,42 @@ 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) {
+ ret = clk_set_rate(l2_clk, policy->l2_rate[0]);
+ /* 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 +228,8 @@ 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 +338,13 @@ 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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